CN120643046A - Elastic force adjustment device and seat - Google Patents

Abstract

The present invention discloses an elastic force adjustment device and a seat, which includes a first component, a second component, a basic elastic member and at least one additional elastic member, the elastic members are arranged in the same direction, and a slider is provided between the two; when the first and second components move relative to each other, the slider can selectively be stationary or move, so that the basic elastic member is deformed alone or together with the additional elastic member to achieve elastic force adjustment; it changes the elastic force by controlling the state of the slider and utilizing whether the elastic members are connected in series, and the adjustment is simple and fast, and the modular design has strong adaptability; when applied to a seat, the device is arranged between the seat and the bottom shell, the first component is connected to the seat, and the second component is connected to the bottom shell; the tilting of the chair back drives the seat to slide, and the device provides buffering and reset elastic force, can be quickly adjusted according to the weight of the user, adapts to different seats, and improves the user experience.

Description

Elasticity adjusting device and seat

Technical Field

The invention relates to the field of furniture, in particular to an elastic force adjusting device and a seat.

Background

With the improvement of life quality, the requirements of people on furniture are gradually improved, the mobility of modern furniture is valued, and the movable part adjusting scheme is a key point of important design of many factories, wherein the part for adjusting the required elastic force is not needed, the more effective and reasonable elastic force adjusting technology is mastered, and the market can be mastered correspondingly.

Taking a seat as an example, in the existing seat, the chair back tilts almost to become a necessary function, so that one of core elements of the user comfort level is improved, and the operation experience and the safety feeling of users with different weights are directly influenced by the elasticity adjusting performance in the tilting process, however, the problem of insufficient function adaptability and poor operation convenience generally exists in the chair back tilting elasticity adjusting scheme of the existing seat, and the diversified use requirements are difficult to meet.

In addition to providing buffer elastic force when the chair back leans and auxiliary reset elastic force when the chair back is restored, the elastic force device in the chair should also be capable of adjusting the elastic force according to the weight of different users, the user with lighter weight is likely to lean backwards due to overlarge elastic force, the user with heavier weight is likely to lean out of control due to insufficient elastic force, so that the operation smoothness is affected, and potential safety hazards exist.

Disclosure of Invention

In order to solve the technical problems, the invention provides an elastic force adjusting device which comprises a first component, a second component, a basic elastic member and at least one additional elastic member, wherein the elastic members are arranged along the same direction, a sliding block is arranged between the first component and the second component, when the first component and the second component relatively move, the sliding block can selectively rest or move to enable the basic elastic member to be singly deformed or jointly deformed with the additional elastic member, so that elastic force adjustment is realized.

The chair back tilts to drive the seat to slide, the device provides buffering and resetting elastic force, and the device can be quickly adjusted according to the weight of a user, is adaptive to different chairs and improves the use experience.

The technical scheme of the invention is realized as follows:

An elastic force adjusting device comprises a first component, a second component, a basic elastic member and at least one additional elastic member, wherein the basic elastic member and the additional elastic member are arranged along the same direction, the first component and the second component are arranged in a relative motion mode, a sliding block is arranged between the basic elastic member and the additional elastic member, the basic elastic member is arranged between the first component and the sliding block, the additional elastic member is arranged between the sliding block and the second component, the sliding block is configured to selectively move or be static relative to the second component, when the sliding block and the second component are relatively static, only the basic elastic member responds to the movement of the first component and the second component to deform, and when the sliding block and the second component are relatively moving, both the basic elastic member and the additional elastic member respond to the movement of the first component and the second component to deform.

Firstly, a basic elastic piece is always in a working state in the device, namely the elastic foundation of the device, so that the device can always provide elastic force, an additional elastic piece can be switched between the working state and a static state under the action of a sliding block, namely when the sliding block and a second component relatively move, the two elastic pieces are in a linkage state, the additional elastic piece can be deformed together with the basic elastic piece, the elastic force which can be provided by the device is smaller at the moment, when the sliding block and the second component relatively rest, the additional elastic piece is separated from the basic elastic piece by the sliding block, the additional elastic piece is static and does not provide elastic force any more, the elastic force is provided by the basic elastic piece only, and the elastic force provided by the basic elastic piece is larger at the moment.

In addition, in this scheme, carry out modularization with elasticity adjusting device, make first part and second part connect the required movable part and the fixed part who adjusts of furniture respectively, provide elasticity when movable part motion to can carry out quick elasticity and adjust, the functional suitability is better.

In the scheme, the judgment of the elastic force is not based on the superposition of the elastic members, but based on whether the elastic members are in a serial connection state or not, the elastic force provided by the elastic members in the serial connection state is smaller, under the condition that the compression amount (namely the relative movement amount of the first component and the second component) and the elastic coefficient are the same, the elastic force provided by the basic elastic member is twice as large as that provided by the basic elastic member and the additional elastic member when the basic elastic member works together, according to the application range (such as the weight range of a user), the gear division is performed, namely the number of the additional elastic members can be selected according to the actual situation, the elastic force is the largest elastic gear when the basic elastic member only acts, the elastic members are the second large elastic gear when the two elastic members act in series, the third large elastic gear when the two elastic members act in series, and the like, and the condition that whether the additional elastic members are in the serial connection state is determined by the movement of the sliding block or not, the state of the sliding block only needs to control the state of the sliding block when the elastic member is adjusted, so that the adjustment is simple and quick.

To achieve the above effect, the elastic members are connected in series, and it is necessary that the elastic members are arranged in the same direction instead of being arranged side by side at intervals, for example, when the relative movement direction of the first member and the second member is the front-rear direction, the elastic members are arranged in the front-rear direction instead of being arranged left-right at intervals.

The spring member may be either compressed or extended when acting.

Preferably, the base elastic member and the additional elastic member are springs. In addition to the usual extension springs, curved spring plates can also act as spring elements.

Preferably, annular grooves for accommodating the ends of the springs are formed in the two end faces of the sliding block. When the elastic piece is compressed and acts, the end parts of the basic elastic piece and the additional elastic piece are both arranged in the annular groove and are abutted against the sliding block, and when the elastic piece is extended and acts, the end part of the elastic piece is also clamped in the annular groove and is not separated.

Preferably, the base spring and the additional spring are both arranged coaxially. The coaxial arrangement is a relatively volume-efficient series arrangement.

Preferably, a blocking piece which is arranged in a sliding way is arranged beside the sliding block along the moving direction of the first component and the second component, when the blocking piece slides between the sliding block and the second component, the blocking piece blocks the sliding block, the sliding block and the second component are relatively static, and when the blocking piece slides to leave between the sliding block and the second component, the blocking piece releases the sliding block, and the sliding block moves relatively to the second component. The sliding block is controlled to move and rest through the blocking piece, the operation is simple and quick, when the sliding block moves, the series connection of the additional elastic piece and the basic elastic piece takes effect, and when the sliding block is static, the series connection of the additional elastic piece and the basic elastic piece fails, and the additional elastic piece does not work any more.

Preferably, the second component is a sleeve, the sliding block, the additional elastic piece and the blocking piece are all arranged in the sleeve, the sliding block and the additional elastic piece are all arranged along the axial direction of the sleeve, and the blocking piece is arranged along the radial direction of the sleeve in a sliding way. The sleeve has the accommodation function, and additional elastic pieces, sliding blocks, blocking pieces and the like can be stably installed.

Preferably, the sleeve is provided with a slot, the slot is radially arranged along the sleeve and penetrates through the sleeve, the blocking piece is slidably arranged in the slot, and the end part of the sliding block is positioned beside the slot. The blocking piece enters or leaves the inside of the sleeve through the slot so as to block or avoid the sliding block.

Preferably, the blocking member is provided with a relief groove for relieving the additional elastic member. The existence of the avoidance groove can prevent the blocking piece from influencing the elastic piece, and the blocking piece can be U-shaped.

Preferably, the end part of the sliding block, which is close to the blocking piece, is provided with a plurality of step parts, and the blocking piece is abutted with any step part to block the sliding block. When the blocking piece blocks the sliding block, the position of the sliding block may have deviation, if no step part exists, the blocking piece cannot block the sliding block when the position of the sliding block deviates, and the step part can give multiple compensation, so that when the sliding block has different deviations, the blocking piece can still be abutted with different step parts to block the sliding block.

Preferably, the second member is provided with a resilient transmission member configured to control sliding of the blocking member. The transmission piece is elastic, is adapted to the stepped part and is convenient for the blocking piece to be blocked and abutted, the protruding degree of the stepped part towards the blocking piece is different, and the blocking piece can not completely enter the second component when being abutted to the stepped part, so that the transmission piece with elasticity is required to be capable of adapting to the protruding of the stepped part, the sliding stroke of the blocking piece is controlled by the transmission piece to be not fixed, and interference is prevented when the blocking piece enters.

Preferably, the two additional elastic members are respectively a first additional elastic member and a second additional elastic member, the second additional elastic member is closer to the second component than the first additional elastic member, the sliding block between the basic elastic member and the first additional elastic member is a first sliding block, a second sliding block is arranged between the first additional elastic member and the second additional elastic member, a sliding first blocking member is arranged beside the first sliding block, a sliding second blocking member is arranged beside the second sliding block, the first blocking member is arranged between the first sliding block and the second sliding block, the second blocking member is arranged between the second sliding block and the second component, a sliding control member is arranged on the second component and is in transmission connection with the first transmission member and the second transmission member, the second transmission member is in transmission connection with the second blocking member, the control member slides to enable the first sliding block and the second sliding block to be blocked preferentially when the first sliding block and the second sliding block are switched to be static relative to the second component, and the control member slides to enable the first sliding block to be switched to be moved relative to the second component to be avoided preferentially. The number of the additional elastic members is more, the gear positions formed by the device is more, but when more than two additional elastic members are arranged, the order of the state switching of the sliding blocks is needed to be additionally considered, in the scheme, the basic elastic members, the first additional elastic members and the second additional elastic members are arranged in sequence, the basic elastic members are always in the working state, the basic elastic members are only in the first gear position when in the working state, the elastic force provided by the first gear position is the largest, the basic elastic members and the adjacent second additional elastic members are in the working state, the basic elastic members are in the second gear position, and the third gear position when in the working state, so that the state switching order of the sliding blocks is realized through the control member, the first transmission member and the second transmission member, the first sliding blocks are released by the first transmission member when the elastic force is gradually reduced, the second sliding blocks are firstly blocked by the second transmission member and then the first sliding blocks by the first transmission member when the elastic force is gradually increased, in order of releasing the sliding blocks from the basic elastic members is gradually reduced, and the principle that the sliding blocks are gradually more gradually and the basic elastic members are gradually more gradually increased when the elastic force is gradually increased is gradually from the sliding blocks.

Preferably, the control member is provided with a first control groove and a second control groove, the first transmission member is arranged in the first control groove, the second transmission member is arranged in the second control groove, and the first control groove and the second control groove are configured to control the movement sequence of the first transmission member and the second transmission member.

Preferably, the first transmission member and the second transmission member are respectively rotatably arranged on the second component, the first control groove is provided with a first static section and a first action section, the first static section and the first action section are in the same moving direction as the first component and the second component, the first control groove is provided with a second static section and a second action section, the first static section is close to the first component relative to the first action end, and the second static section is far away from the first component relative to the second action section. The preset movement sequence is realized through the structural design, namely the sequence for controlling the sliding blocks is realized, and the structure is simple and ingenious.

Preferably, the control member is connected with a stay wire, the stay wire is configured to drive the control member to move, and an elastic reset member is arranged between the control member and the second member and is configured to give the elastic reset force to the control member opposite to the movement direction of the stay wire driving control member. In this scheme, act as go-between also have three gear, correspond first slider and the equal locking of second slider respectively, first slider unblock second slider is locked, first slider and the equal unblock of second slider.

Preferably, a guide shaft is arranged between the first part and the second part, the guide shaft is arranged along the movement direction of the first part and the second part, the sliding block is arranged on the guide shaft in a sliding mode, the guide shaft is inserted into the first part, and when the first part and the second part move, the first part slides on the guide shaft. The presence of the guide shaft can increase the stability of the device during movement. The first component is provided with a through jack, the guide shaft is arranged in the jack, and when the first component moves close to the second component, the guide shaft selectively extends out of the first component.

A chair comprises a chair back, a seat part, a bottom shell and an elastic force adjusting device, wherein the chair back is rotatably arranged on the bottom shell, the seat part is slidably arranged on the bottom shell and is linked with the chair back, the elastic force adjusting device is arranged between the seat part and the bottom shell along the front-back direction, a first component is connected with the seat part, a second component is connected with the bottom shell, and when the chair back is rotated backwards, the seat part slides forwards on the bottom shell and enables the first component to move close to the second component.

The device is applied to seats, provides buffer elastic force for the back of the seat to recline, provides auxiliary restoring force when the back of the seat rotates forwards to restore to be upright, can quickly adjust the elastic force according to the weight of a user, is modularized, can be applied to different seats, can be compressed or elongated when the elastic member acts, in the scheme, the seat moves forwards when the back of the seat leans backwards, the elastic member compresses to provide elastic force, and the elastic member is elongated when the back of the seat restores to be upright, but the elastic member also assists the seat to move backwards and the back of the seat to restore to be upright through the compressed and stored elastic force.

Preferably, the bottom shell is provided with a circular shaft, the front end of the second component is provided with a circular groove, and the circular shaft is abutted in the circular groove. The device gives adaptive rotation while telescoping movement, preventing interference.

Preferably, the left side and the right side of the seat part and the bottom shell are respectively provided with an elastic force adjusting device. If only one elastic force adjusting device is arranged in the middle, the elastic force adjusting devices are arranged on the left side and the right side, so that the stress can be kept uniform and stable.

Preferably, the left and right end parts of the bottom shell are provided with convex seats extending upwards, the chair back is rotatably connected with the convex seats, the seat part is provided with an extending part extending upwards, and the chair back is rotatably connected with the extending part.

The design starting point, the idea and the beneficial effects of the invention adopting the technical scheme are as follows:

Firstly, a basic elastic piece is always in a working state in the device, namely the elastic foundation of the device, so that the device can always provide elastic force, an additional elastic piece can be switched between the working state and a static state under the action of a sliding block, namely when the sliding block and a second component relatively move, the two elastic pieces are in a linkage state, the additional elastic piece can be deformed together with the basic elastic piece, the elastic force which can be provided by the device is smaller at the moment, when the sliding block and the second component relatively rest, the additional elastic piece is separated from the basic elastic piece by the sliding block, the additional elastic piece is static and does not provide elastic force any more, the elastic force is provided by the basic elastic piece only, and the elastic force provided by the basic elastic piece is larger at the moment.

In addition, in this scheme, carry out modularization with elasticity adjusting device, make first part and second part connect the required movable part and the fixed part who adjusts of furniture respectively, provide elasticity when movable part motion to can carry out quick elasticity and adjust, the functional suitability is better.

In the scheme, the judgment of the elastic force is not based on the superposition of the elastic members, but based on whether the elastic members are in a serial connection state or not, the elastic force provided by the elastic members in the serial connection state is smaller, under the condition that the compression amount (namely the relative movement amount of the first component and the second component) and the elastic coefficient are the same, the elastic force provided by the basic elastic member is twice as large as that provided by the basic elastic member and the additional elastic member when the basic elastic member works together, according to the application range (such as the weight range of a user), the gear division is performed, namely the number of the additional elastic members can be selected according to the actual situation, the elastic force is the largest elastic gear when the basic elastic member only acts, the elastic members are the second large elastic gear when the two elastic members act in series, the third large elastic gear when the two elastic members act in series, and the like, and the condition that whether the additional elastic members are in the serial connection state is determined by the movement of the sliding block or not, the state of the sliding block only needs to control the state of the sliding block when the elastic member is adjusted, so that the adjustment is simple and quick.

To achieve the above effect, the elastic members are connected in series, and it is necessary that the elastic members are arranged in the same direction instead of being arranged side by side at intervals, for example, when the relative movement direction of the first member and the second member is the front-rear direction, the elastic members are arranged in the front-rear direction instead of being arranged left-right at intervals.

Drawings

FIG. 1 is a schematic perspective view of a seat using a spring force adjusting device according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of a seat using an elastic force adjusting device according to a second embodiment of the present invention;

Fig. 3 is a schematic perspective view of an elastic force adjusting device according to an embodiment of the present invention, wherein the elastic force adjusting device is disposed between a seat and a bottom shell;

FIG. 4 is a schematic perspective view of the device in the working state of the additional elastic members according to the embodiment of the invention;

FIG. 5 is a cross-sectional view of the device of the present invention in an embodiment in which the additional elastic members are all in an operative state;

FIG. 6 is a schematic perspective view of the device according to the present invention in a stationary state only with the second attachment member;

FIG. 7 is a cross-sectional view of the device of the present invention in an embodiment with only the second attachment member at rest;

FIG. 8 is a schematic perspective view of the device according to the present invention when only the base attachment is in the working state;

FIG. 9 is a cross-sectional view of the device of the present invention with only the base attachment in an operative condition;

FIG. 10 is a schematic perspective view of a first component in an embodiment of the invention;

FIG. 11 is a schematic perspective view of a slider according to an embodiment of the present invention;

FIG. 12 is a schematic perspective view of a barrier in an embodiment of the invention;

FIG. 13 is a schematic perspective view of a second component in an embodiment of the invention;

FIG. 14 is a schematic perspective view of the slider blocked by the blocking member according to the embodiment of the present invention;

FIG. 15 is a schematic view of a coaxial series arrangement of spring elements in an embodiment of the invention;

Fig. 16 is a schematic perspective view of a driving connection of a control member and a blocking member through a driving member in an embodiment of the present invention.

The reference numerals are spring force adjusting device 100, first part 1, limit post 11, extension shaft 12, insertion hole 13, second part 2, round slot 21, insertion slot 22, base spring 3, additional spring 4, first additional spring 4a, second additional spring 4b, slide 5, first slide 5a, second slide 5b, ring slot 8, step 9, blocking member 6, first blocking member 6a, second blocking member 6b, evading slot 15, first transmission member 16, second transmission member 17, arm 18, control member 19, first control slot 20, first stationary section 201, first operating section 202, second control slot 23, second stationary section 231, second operating section 232, long slot 24, guide shaft 25, wire 26, protruding strip 27, spring return 28, 200, seat 300, extension 301, mounting slot 302, mounting seat 303, limit slot 304, bottom shell 400, protruding seat 401, round shaft 402.

Detailed Description

In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The specific embodiments of the present invention are as follows:

As shown in fig. 3, 4, 14 and 15, the present invention provides a spring force adjusting device 100, which comprises a first component 1, a second component 2, a base spring member 3 and at least one additional spring member 4, wherein the base spring member 3 and the additional spring member 4 are arranged along the same direction, the first component 1 and the second component 2 are arranged in a relative motion, a sliding block 5 is arranged between the base spring member 3 and the additional spring member 4, the base spring member 3 is arranged between the first component 1 and the sliding block 5, the additional spring member 4 is arranged between the sliding block 5 and the second component 2, the sliding block 5 is configured to selectively move or be static relative to the second component 2, when the sliding block 5 and the second component 2 are relatively static, only the base spring member 3 is deformed in response to the movement of the first component 1 and the second component 2, and when the sliding block 5 and the second component 2 are relatively moving, both the base spring member 3 and the additional spring member 4 are deformed in response to the movement of the first component 1 and the second component 2.

Firstly, the basic elastic piece 3 is always in a working state in the device, namely the elastic foundation of the device, so that the device can always provide elastic force, the additional elastic piece 4 can be switched between the working state and the static state under the action of the sliding block 5, namely when the sliding block 5 and the second component 2 relatively move, the two elastic pieces are in a linkage state, the additional elastic piece 4 can be deformed together with the basic elastic piece 3, the elastic force which can be provided by the device is smaller, when the sliding block 5 and the second component 2 relatively rest, the additional elastic piece 4 and the basic elastic piece 3 are separated by the sliding block 5, the additional elastic piece 4 is static and does not provide elastic force any more, the elastic force is provided by the basic elastic piece 3 only, and the elastic force provided by the basic elastic piece 3 is larger.

In addition, in this scheme, with elasticity adjusting device 100 modularization, make first part 1 and second part 2 connect the required movable part and the fixed part who adjusts of furniture respectively, provide elasticity when movable part moves to can carry out quick elasticity and adjust, the functional suitability is better.

In the scheme, the judgment of the elastic force is not based on the superposition of elastic members, but based on whether the elastic members are in a serial connection state, the elastic force provided by the elastic members in the serial connection state is smaller, under the condition that the compression amount (namely the relative motion amount of the first component 1 and the second component 2) and the elastic coefficient are the same, the elastic force provided by the basic elastic member 3 is twice as large as that provided by the basic elastic member 3 and the additional elastic member 4 when the basic elastic member 3 works together, according to the adaptive range (such as the weight range of a user), the gear division is performed, namely the number of the additional elastic members 4 can be selected according to the actual condition, the elastic force is the largest elastic gear when the basic elastic member 3 works in a serial connection mode, the elastic force is the second large elastic gear when the two elastic members work in a serial connection mode, the third elastic gear is the elastic force when the three elastic members work in a serial connection mode, and the like, and whether the additional elastic member 4 works in a serial connection mode is determined by the motion of the sliding block 5 or not, the state of the sliding block 5 is controlled only when the user adjusts the elastic force.

To achieve the above effect, the elastic members are arranged in series, and it is necessary that the elastic members are arranged in the same direction instead of being arranged side by side at intervals, such as when the relative movement direction of the first member 1 and the second member 2 is the front-rear direction, the elastic members are all arranged in the front-rear direction instead of being arranged left-right at intervals.

As shown in fig. 1 to 3, the device is applied to a seat comprising a seat back 200, a seat 300, a bottom case 400 and an elastic force adjusting device 100 as described above, wherein the seat back 200 is rotatably provided on the bottom case 400, the seat 300 is slidably provided on the bottom case 400 and is interlocked with the seat back 200, the elastic force adjusting device 100 is provided between the seat 300 and the bottom case 400 in the front-rear direction, the first member 1 is connected with the seat 300, the second member 2 is connected with the bottom case 400, and the seat 300 is slid forward on the bottom case 400 and moves the first member 1 close to the second member 2 when the seat back 200 is rotated backward.

The device is applied to seats, provides buffer elastic force for the back 200 to recline, provides auxiliary restoring force when the back 200 rotates forwards to restore to be upright, can quickly adjust the elastic force according to the weight of a user, is modularized, can be applied to different seats, can be compressed or extended when the elastic member acts, in the scheme, the seat 300 moves forwards when the back 200 tilts backwards, the elastic member compresses to provide elastic force, and the elastic member is extended when the back 200 restores to be upright, but the elastic member also assists the seat 300 to move backwards and the back 200 to restore to be upright through the compressed and stored elastic force.

Specifically, as shown in fig. 4, 5 and 10-13, the left and right end portions of the bottom case 400 are provided with convex seats 401 extending upwards, the chair back 200 is rotatably connected with the convex seats 401, the seat 300 is provided with an extending portion 301 extending upwards, the chair back 200 is rotatably connected with the extending portion 301, when the chair back 200 is tilted backwards and rotated, the seat 300 is driven to slide forwards on the bottom case 400, when the chair back 200 is tilted forwards and rotated, the seat 300 is driven to slide backwards on the bottom case 400, rectangular mounting grooves 302 are formed in the seat 300, the elastic force adjusting device 100 is mounted in the mounting grooves 302 and arranged in the front-rear direction, the rear end portions of the mounting grooves 302 are provided with concave mounting seats 303, the mounting seats 303 are provided with limiting grooves 304, the first component 1 is in a block shape, the left and right end surfaces of the first component 1 are provided with limiting columns 11, when the device is mounted in the mounting grooves 302, the upper portions of the limiting columns 11 extend downwards and tilt backwards from top to bottom, and under the elastic force of the device, the limiting columns 11 are positioned at the lower ends of the limiting columns 304 and are not easy to separate from the lower ends of the limiting columns.

The second part 2 is a sleeve, the front end of the second part 2 is provided with a circular groove 21, the front part of the bottom shell 400 is provided with a circular shaft 402 arranged along the left-right direction, the circular shaft 402 is abutted in the circular groove 21, the device can adaptively rotate while performing telescopic movement to prevent interference, the left side and the right side of the seat 300 and the bottom shell 400 are respectively provided with an elastic force adjusting device 100, if only one elastic force adjusting device 100 can be arranged in the middle, and in the embodiment, the left side and the right side of the bottom shell 400 are respectively provided with the elastic force adjusting devices 100 to keep uniform and stable stress.

Further, two additional elastic members 4 are respectively a first additional elastic member 4a and a second additional elastic member 4b, the elastic members are springs, a bent spring plate can also be used as an elastic member except a common telescopic spring, the two additional elastic members 4 are respectively arranged in the second component 2, the two sliding blocks 5 are respectively a first sliding block 5a and a second sliding block 5b, the sliding blocks 5 are respectively arranged in the second component 2, the basic elastic member 3 is exposed out of the second component 2 and is arranged between the first component 1 and the second component 2, two blocking members 6 are respectively arranged in the second component 2 corresponding to the two sliding blocks 5, the first blocking members 6a and the second blocking members 6b, the sliding blocks 5 and the additional elastic members 4 are respectively arranged along the axial direction of the second component 2, the second component 2 is a sleeve, the sliding blocks 6 are respectively arranged along the radial direction of the sleeve, the second component 2 is provided with a containing function, the additional elastic members 4, the sliding blocks 5, the blocking members 6 and the like are stably installed, and the sliding blocks are perpendicular to the sliding direction of the sliding blocks.

Two slots 22 which are spaced back and forth are formed in the second component 2 and correspond to the two blocking pieces 6, the two slots 22 are radially arranged along the second component 2 and penetrate into the second component 2, and the blocking pieces 6 are slidably arranged in the slots 22; the end of the sliding block 5 is located at the side of the slot 22, the blocking piece 6 is arranged at the side of the sliding block 5 along the moving direction of the first component 1 and the second component 2, the blocking piece 6 enters or leaves the inside of the sleeve through the slot 22 to block or avoid the sliding block 5, the blocking piece 6 blocks the sliding block 5 when the blocking piece 6 slides between the sliding block 5 and the second component 2, the sliding block 5 is relatively static to the second component 2, the blocking piece 6 releases the sliding block 5 when the blocking piece 6 slides between the sliding block 5 and the second component 2, the sliding block 5 relatively moves relative to the second component 2, the movement and static of the sliding block 5 are controlled through the blocking piece 6, the operation is simple and rapid, the series connection of the additional elastic piece 4 and the basic elastic piece 3 is effective when the sliding block 5 moves, the series connection of the additional elastic piece 4 and the basic elastic piece 3 fails, the additional elastic piece 4 does not work any more, the blocking piece 6 is provided with the avoiding groove 15 for avoiding the additional elastic piece 4, the existence of the groove 15 can prevent the blocking piece 6 from affecting the elastic piece, and the blocking piece 6 can be U-shaped.

As shown in fig. 14 and 15, the base elastic member 3 and the additional elastic member 4 are coaxially arranged; the coaxial arrangement is a series arrangement which saves more volume; the second additional elastic member 4b is closer to the second component 2 than the first additional elastic member 4 a; the sliding block 5 between the basic elastic member 3 and the first additional elastic member 4a is a first sliding block 5a, the sliding block 5 between the first additional elastic member 4a and the second additional elastic member 4b is a second sliding block 5b, the first blocking member 6a is arranged beside the first sliding block 5a, the second blocking member 6b is arranged beside the second sliding block 5b, the first blocking member 6a is positioned between the first sliding block 5a and the second sliding block 5b, the second blocking member 6b is positioned between the second sliding block 5b and the second component 2, the two end surfaces of the sliding block 5 are provided with annular grooves 8 for accommodating the end parts of a spring, in this embodiment, the elastic members act through compression, the end parts of the basic elastic member 3 and the end parts of the additional elastic member 4 are arranged in the annular grooves 8 and are abutted with the sliding block 5, in addition, when the elastic members are elongated and act, the end parts of the elastic members also need to be clamped in the annular grooves 8 and are not separated, the annular grooves 8 are also arranged on the first component 1, specifically, the front end surface of the basic elastic member 3 is positioned in the first sliding block 5a and the rear end surface of the first sliding block 5 and is abutted against the first elastic member 5a and the rear end part of the first elastic member 4a and the rear end part of the second elastic member 4a is abutted against the first elastic member 5a and the rear end part of the first elastic member 4a and the second elastic member 1 is abutted against the first elastic member 5b and the end part of the first elastic member 5b is abutted against the end part of the first elastic member 5b and the first end part 4b and the end part is abutted against the first end part of the first elastic member 5b and the end part 5b is arranged in the first end part and the end side and the second elastic member 5b and the end part and the end 5b is abutted against the end part and the end 5 and the end 5 and the other end part and the other end part, and the other end part, and the and is, the front end of the second additional elastic member 4b is abutted against the second component 2, so that the base elastic member 3, the first additional elastic member 4a and the second additional elastic member 4b are coaxially arranged in an end-to-end manner and can selectively realize the series connection of springs, and further, the two slots 22 are respectively positioned in front of the first sliding block 5a and in front of the second sliding block 5b, namely, the first blocking member 6a is positioned in front of the first sliding block 5a, and the second blocking member 6b is positioned in front of the first sliding block 5 a.

A guide shaft 25 is arranged between the first part 1 and the second part 2, the guide shaft 25 is arranged along the movement direction of the first part 1 and the second part 2, namely, the guide shaft 25 is arranged along the front-back direction, the first sliding block 5a and the second sliding block 5b are both sleeved on the guide shaft 25 in a sliding mode, the basic elastic piece 3, the first additional elastic piece 4a and the second additional elastic piece 4b are all sleeved outside the guide shaft 25, in addition, the outer surfaces of the first sliding block 5a and the second sliding block 5b are also in sliding fit with the inner surface of the second part 2, the guide shaft 25 is inserted into the first part 1, when the first part 1 and the second part 2 move, the first part 1 slides on the guide shaft 25, the stability of the device during movement can be improved due to the existence of the guide shaft 25, further, the first part 1 is provided with a hollow extending shaft 12 in a forward extending mode at the center part of a ring groove 8, a through jack 13 is formed in the extending shaft 12, the guide shaft 25 is arranged in the jack 13, and when the first part 1 moves close to the second part 2, the guide shaft 25 selectively extends out of the first part 1 through the jack 13.

As shown in figures 11 and 12, although the sliding block 5 can keep a stable position approximately under the action of the front elastic member and the rear elastic member, the sliding block 5 still possibly has deviation, therefore, the end part of the sliding block 5, which is close to the blocking member 6, is provided with a plurality of step parts 9, the blocking member 6 is abutted against any step part 9 to block the sliding block 5, when the blocking member 6 blocks the sliding block 5, the position of the sliding block 5 possibly has deviation, if the step parts 9 are not provided, the blocking member 6 can not block the sliding block 5 when the position of the sliding block 5 deviates, the step parts 9 can be compensated for multiple times, so that the sliding block 5 can still be blocked by abutting against different step parts 9 when the sliding block 5 has different deviations, meanwhile, two elastic transmission members, namely a first transmission member 16 and a second transmission member 17, are respectively used for controlling the sliding of the first blocking member 6a and the second blocking member 6b, the transmission member has elasticity and is adaptive to the step parts 9, the blocking member 6 can be conveniently blocked and abutted against each step part 9, the degree of the protrusion of the step parts 9 facing the blocking member 6 is different, and the transmission member 6 can not be completely abutted against the transmission member 6, and the transmission member can not be prevented from being matched when the step parts are required to enter the transmission part to be completely and matched to have the transmission part with the transmission part 6.

The number of the additional elastic pieces 4 is more than two, so that the change between a plurality of elastic gears can be realized only by sequentially switching the working state and the static state of the additional elastic pieces 4, wherein a sliding control piece 19 is arranged on the second part 2, the control piece 19 is in transmission connection with a first transmission piece 16 and a second transmission piece 17, the first transmission piece 16 is in transmission connection with a first blocking piece 6a, and the second transmission piece 17 is in transmission connection with a second blocking piece 6 b; the control piece 19 slides to enable the first slide block 5a and the second slide block 5b to be switched to be static relative to the second component 2, the first blocking piece 6a is used for blocking the second slide block 5b preferentially, the control piece 19 slides to enable the first slide block 5a and the second slide block 5b to be switched to be moving relative to the second component 2, the first blocking piece 6a is used for avoiding the first slide block 5a preferentially, the number of additional elastic pieces 4 is more, the gear positions formed by the device are more, but the switching sequence of the states of the slide blocks 5 is additionally considered when the control piece is provided with more than two additional elastic pieces 4, in the scheme, the basic elastic pieces 3, the first additional elastic pieces 4a and the second additional elastic pieces 4b are arranged according to the sequence, the basic elastic pieces 3 are always in the working state, only the first gear position is the first elastic piece is the working state, the elastic force provided by the first gear position is the largest, then the second additional elastic pieces 4b adjacent to the basic elastic pieces 3 are in the working state, the third gear position is the working state, therefore, the first elastic pieces are gradually released when the first elastic pieces 17 are gradually released when the second elastic pieces 5 are switched by the slide blocks 5a through the control piece 19, the first transmission piece 16 and the second transmission piece 17 are gradually released when the second transmission piece 17 is the second transmission piece is the sliding in the first sliding state, and vice versa, the second transmission member 17 blocks the second slider 5b and the first transmission member 16 blocks the first slider 5a, and in summary, when the elastic force is to be reduced, the order of releasing the sliders 5 should be gradually unlocked from the closer to the base elastic member 3, and when the elastic force is to be increased, the order of blocking the sliders 5 should be gradually locked from the closer sliders 5 from the farther from the base elastic member 3.

In this example, the control member 19 is slidably disposed on the lower surface of the second member 2, the lower surface of the second member 2 is downwardly provided with a protruding strip 27, the control member 19 is plate-shaped, and a long groove 24 is correspondingly formed on the control member 19, the control member 19 is disposed on the second member 2 by a screw or a gasket, so that the protruding strip 27 is located in the long groove 24, and the position of the protruding strip 27 in the long groove 24 changes when the control member 19 slides; the control member 19 is provided with a first control slot 20 and a second control slot 23, respectively, the first transmission member 16 is arranged in the first control slot 20, the second transmission member 17 is arranged in the second control slot 23, the first control slot 20 and the second control slot 23 are configured to control the movement sequence of the first transmission member 16 and the second transmission member 17, specifically, the first transmission member 16 and the second transmission member 17 are respectively rotatably arranged on the second member 2, the first control slot 20 is provided with a first stationary section 201 which is in the same direction as the movement direction of the first member 1 and the second member 2, and a first action section 202 which is inclined relative to the first stationary section 201, correspondingly, the second control slot 23 is provided with a second stationary section 231 and a second action section 232, the first stationary section 201 is close to the first member 1 relative to the first action end, the second stationary section 231 is far away from the first member 1 relative to the second action section 232, in this example, the first stationary section 201 is arranged in the front-rear direction of the second control slot 23, the first stationary section 201 is arranged in the front-rear direction and is located in the first action section 202, the first stationary section is inclined from the front-rear section 231 is located in the same direction as the first stationary section 231, the front-rear section is inclined from the first stationary section 231 is located in the front-to the second stationary section 231, the front-to the second stationary section is located in the front-to the front-side of the second stationary section 231 is inclined from the first stationary section 231, the first action section 202 is almost the same as the second action section 232, when the control element 19 slides, the transmission element at the static section is kept static, and the transmission element at the action section rotates to control the corresponding blocking element 6 to slide, and the preset movement sequence is realized through the structural design, namely the sequence for controlling the sliding block 5 is realized, and the structure is simple and ingenious.

As shown in fig. 3-14 and 16, the control member 19 is connected with a pull wire 26, the pull wire 26 is configured to drive the control member 19 to move, an elastic reset member 28 is further arranged between the control member 19 and the second member 2, the elastic reset member 28 is configured to give the elastic reset force to the control member opposite to the direction in which the pull wire drives the control member to move, the elastic reset member 28 in this embodiment is a tension spring, in this scheme, the pull wire 26 also has three gears, corresponding to the first slide block 5a and the second slide block 5b, respectively, the first slide block 5a is locked to unlock the second slide block 5b, and the first slide block 5a is unlocked to the second slide block 5 b.

More specifically, the transmission member is a torsion spring and has two arms 18, one arm 18 is inserted in the blocking member 6 to control the sliding of the blocking member 6, and the other arm 18 is inserted in the control slot to generate rotation in response to the sliding of the control member 19; when the control member 19 is located at the forefront, the support arms 18 of the first transmission member 16 and the second transmission member 17 are located at the same position in the left-right direction, the support arm 18 of the first transmission member 16 is located at the rear end of the first stationary section 201, the support arm 18 of the second transmission member 17 is located at the rear end of the second acting section 232, at this time, the first blocking member 6a and the second blocking member 6b do not block the first sliding block 5a and the second sliding block 5b, the first additional elastic member 4a and the second additional elastic member 4b are both in working states, the three elastic members are connected in series, the elastic force is the smallest, and at this time, the first gear of the wire 26 is the first gear; when the control member 19 is slid backwards by the wire 26, the arm 18 of the first transmission member 16 moves in the first stationary section 201, the first transmission member 16 remains stationary, the arm 18 of the second transmission member 17 moves in the second acting section 232 and rotates the second transmission member 17 due to tilting, the second transmission member 17 pushes the second blocking member 6b inwards, when the arm 18 of the first transmission member 16 is located at the front end of the first stationary section 201, at the rear end of the first acting section 202, the arm 18 of the second transmission member 17 is located at the front end of the second acting section 232, at the rear end of the second stationary section 231, the second blocking member 6b is located inside the second part 2 and blocks the second slider 5b, the first blocking member 6a still does not block the first slider 5a, at this time the second additional elastic member 4b is switched to the stationary state, only the base elastic member 3 is connected in series with the first additional elastic member 4a, the elastic force becomes large, in this case, the second gear of the wire 24 is the second gear, when the wire 24 drives the control member 19 to slide further backward, the arm 18 of the first transmission member 16 moves in the first acting section 202, so that the first transmission member 16 rotates to drive the first blocking member 6a to slide inwards, the arm 18 of the second transmission member 17 moves in the second static section 211, the second blocking member 6b keeps blocking the second slider 5b, when the control member 19 slides to the rearmost end, the arm 18 of the first transmission member 16 is at the front end of the first acting section 202, the arm 18 of the second transmission member 17 is at the front end of the second static section 211, the first blocking member 6a and the second blocking member 6b are both positioned in the second part 2, the first blocking member 6a blocks the first slider 5a, so that the first additional elastic member 4a is also switched to a static state, and only the basic elastic member 3 is in a working state, and the elastic force is the maximum, at this time, the third gear of the wire 24 is the third gear.

A further advantage of the transmission member being a torsion spring is that it is possible to achieve a delay lock, when the slider 5 is under the influence of the spring members on both sides, resulting in its position in the second part 2 just blocking the slot 22, the blocking member 6 cannot enter the interior of the second part 2, nor can the arm 18 attached thereto move, but the control member 19 is still able to drive the arm 18 located in the control slot to move so that the transmission member accumulates a spring force which is released when the slider 5 is slid to no longer block the slot 22, driving the blocking member 6 into the second part 2 and blocking the slider 5.

Even if more additional elastic members 4 are provided, the working state and the rest state of each additional elastic member 4 can be sequentially switched through the adaptive design of the control grooves, for example, the control groove of the foremost gear and the control groove of the rearmost gear are only two sections, namely an action section and a rest section, and the control groove of the middle gear is three sections, namely rest and action rest, and the difference is only that the positions of the action sections are different, and the control sequence can be determined according to the different positions of the action sections.

Claims (19)

1. The elastic force adjusting device is characterized by comprising a first component, a second component, a basic elastic member and at least one additional elastic member, wherein the basic elastic member and the additional elastic member are arranged in the same direction, the first component and the second component are arranged in a relative motion mode, a sliding block is arranged between the basic elastic member and the additional elastic member, the basic elastic member is arranged between the first component and the sliding block, the additional elastic member is arranged between the sliding block and the second component, the sliding block is configured to selectively move or be static relative to the second component, when the sliding block and the second component are relatively static, only the basic elastic member stretches and contracts in response to the movement of the first component and the second component, and when the sliding block and the second component are relatively moving, both the basic elastic member and the additional elastic member stretch and contract in response to the movement of the first component and the second component.

2. The device of claim 1, wherein the base spring member and the additional spring member are springs.

3. The elastic force adjusting device according to claim 2, wherein ring grooves for accommodating the ends of the springs are formed in both end surfaces of the slider.

4. The spring force adjustment device according to claim 1 or 2, wherein the base spring member and the additional spring member are both coaxially arranged.

5. The spring force adjusting device according to claim 1, wherein a blocking member is provided beside the slider in a movement direction of the first member and the second member, the blocking member blocking the slider when the blocking member slides between the slider and the second member, the slider being relatively stationary with respect to the second member, and releasing the slider when the blocking member slides out of between the slider and the second member, the slider being relatively movable with respect to the second member.

6. The device of claim 5, wherein the second member is a sleeve, the slider, the additional elastic member, and the stopper are disposed in the sleeve, the slider and the additional elastic member are disposed along an axial direction of the sleeve, and the stopper is disposed slidably along a radial direction of the sleeve.

7. The elastic force adjusting device according to claim 6, wherein the sleeve is provided with slots, the slots are radially arranged along the sleeve and penetrate into the sleeve, the blocking piece is slidably arranged in the slots, and the end parts of the sliding blocks are located beside the slots.

8. The spring force adjustment device of claim 5, wherein the blocking member is provided with a relief groove for relieving the additional spring member.

9. The elastic force adjusting device according to claim 5, wherein the end portion of the slider, which is close to the blocking member, is provided with a plurality of stepped portions, and the blocking member abuts against any of the stepped portions to block the slider.

10. The spring force adjustment device of claim 9, wherein the second member is provided with a resilient transmission member configured to control sliding movement of the blocking member.

11. The elastic force adjusting device according to claim 1, wherein the two additional elastic members are a first additional elastic member and a second additional elastic member, the second additional elastic member is closer to the second component than the first additional elastic member, the sliding block between the base elastic member and the first additional elastic member is a first sliding block, a second sliding block is arranged between the first additional elastic member and the second additional elastic member, a sliding first blocking member is arranged beside the first sliding block, a sliding second blocking member is arranged beside the second sliding block, the first blocking member is arranged between the first sliding block and the second sliding block, the second blocking member is arranged between the second sliding block and the second component, a sliding control member is arranged on the second component, the control member is in transmission connection with a first transmission member and a second transmission member, the first transmission member is in transmission connection with the first blocking member, the second transmission member is in transmission connection with the second blocking member, the control member slides to enable the first sliding block and the second sliding block to block the second sliding block when the first sliding block and the second sliding block are switched to be stationary relative to the second component, and the control member is enabled to move away from the first blocking member preferentially.

12. The elastic force adjusting device as set forth in claim 11, wherein the control member is provided with a first control groove and a second control groove, respectively, the first transmission member is disposed in the first control groove, the second transmission member is disposed in the second control groove, and the first control groove and the second control groove are configured to control a movement sequence of the first transmission member and the second transmission member.

13. The spring force adjuster according to claim 12, wherein the first and second transmission members are rotatably provided on the second member, respectively, the first control groove has a first stationary portion having the same direction as the first and second members and a first acting portion inclined with respect to the first stationary portion, and the second control groove has a second stationary portion and a second acting portion, respectively, the first stationary portion being adjacent to the first member with respect to the first acting end, and the second stationary portion being distant from the first member with respect to the second acting portion.

14. The elastic force adjusting device as set forth in claim 13, wherein the control member is connected with a wire configured to drive the control member to move, and an elastic restoring member is further provided between the control member and the second member, the elastic restoring member being configured to give the control member an elastic restoring force opposite to a direction in which the wire drives the control member to move.

15. The elastic force adjusting device according to claim 1, wherein a guide shaft is arranged between the first part and the second part, the guide shaft is arranged along the movement direction of the first part and the second part, the sliding block is arranged on the guide shaft in a sliding manner, the guide shaft is inserted into the first part, and the first part slides on the guide shaft when the first part and the second part move.

16. A seat, characterized by comprising a seat back, a seat part, a bottom shell and an elastic force adjusting device according to any one of claims 1-15, wherein the seat back is rotatably arranged on the bottom shell, the seat part is slidably arranged on the bottom shell and is linked with the seat back, the elastic force adjusting device is arranged between the seat part and the bottom shell along the front-back direction, a first component is connected with the seat part, a second component is connected with the bottom shell, and the seat part slides forwards on the bottom shell and enables the first component to move close to the second component when the seat back tilts backwards.

17. The seat according to claim 16, wherein the bottom shell is provided with a circular shaft, the front end of the second member is provided with a circular groove, and the circular shaft is abutted in the circular groove.

18. The chair according to claim 16, wherein the seat and the left and right sides of the bottom case are provided with an elastic force adjusting means, respectively.

19. The chair according to claim 16, wherein the left and right end portions of the bottom case have upwardly extending bosses, the chair back is rotatably coupled to the bosses, and the seat has upwardly extending extensions, the chair back is rotatably coupled to the extensions.