CN120680445A - Labor-saving pliers convenient for changing jaws - Google Patents

Abstract

The invention discloses a labor-saving pliers which is convenient for replacing the jaws, relates to the technical field of daily maintenance, comprises a pliers head, a force-applying handle, and a force-increasing auxiliary handle sleeved on the outer end of the handle, which slides and cooperates with a fixed rod in a limit groove of the handle through a slider, and a screw is driven by an adjusting button head to drive a gear rack to engage with a gear rack in the handle, so that the length of the force-applying arm can be steplessly adjusted, and cooperates with a thumb grip sleeve to improve the labor-saving effect and the comfort of holding. An occlusal tooth groove is provided on the inner side of the pliers head, and a front-end axial pin is connected to the pliers beak with a cutting pliers blade, and a replaceable tooth seat is fixed by a fastening bolt to meet various operation requirements. The quick locking component consists of a pressing cap and a reset cap linkage positioning structure, and the pressing cap drives the pressure rod to insert the pin rod into the arc bar positioning hole to lock the handle, and the reset cap triggers the spring structure to realize quick unlocking, and a screwdriver head, an awl and other auxiliary tool parts are integrated into the placement slot at the rear end of the handle. The pliers integrate labor-saving operation, function switching, quick locking and multi-functions, which significantly improves operation efficiency and practicality.

Description

Labor-saving pliers convenient for changing jaws

Technical Field

The invention relates to the technical field of daily maintenance, in particular to labor-saving pliers convenient for replacing jaws.

Background

In the field of tool manufacturing, pliers are used as a common clamping and shearing tool and are widely applied to various industries such as mechanical maintenance, building construction, electronic assembly and the like. However, in the practical use process of the conventional pliers, a plurality of technical bottlenecks to be solved are existed.

In the aspect of force application structure, the traditional pliers generally adopt a fixed force application arm design, and the length of the force application arm cannot be adjusted. This design makes it difficult to flexibly handle pliers when working against different torque demands. For example, when the fastening nut on the large-scale mechanical equipment is disassembled, the user often needs to consume a great deal of physical effort due to the too short force application arm, even the user cannot finish the operation due to the fact that enough torque cannot be provided, and when the fine parts are processed, the operation is not flexible enough due to the too long force application arm.

In terms of jaw functions, the jaws of the existing pliers are usually of a fixed structure and have a single function. For example, the clamping pliers cannot complete the shearing operation, and the shearing pliers have difficulty in achieving stable clamping of a workpiece of a particular shape. If the requirement of diversified operations is met, a user needs to be provided with a plurality of pliers with different functions, so that the carrying burden of tools is increased, and the use cost is also increased.

In terms of locking and unlocking handles, conventional pliers mostly adopt a simple buckle type locking structure or have no locking function at all. The simple buckle is easy to loose and fall off in the use process, so that the handle shakes, the operation precision is affected, and potential safety hazards can be caused. And the pliers without locking function are difficult to keep the opening and closing angles of the handles stable when a large force is applied for a long time, and users need to control the pliers continuously with force, so that the operation difficulty and the labor intensity are increased.

In summary, the existing pliers cannot meet the requirements of modern industrial production and diversified operations on the efficiency, convenience and safety of tools, and a labor-saving pliers convenient for replacing jaws is needed to be a key for solving the problems of current operation efficiency and operation safety.

Disclosure of Invention

The invention aims to provide labor-saving pliers convenient for changing jaws, which solves the problems of the existing pliers that the existing pliers have defects in the aspects of force application adjustment, jaw function switching, handle locking and the like.

In order to achieve the aim, the invention provides the following technical scheme that the labor-saving pliers convenient for changing the jaws comprise two pliers heads and two force application handles:

The front end of the force application handle is respectively connected with a binding clip through a shaft pin, the outer end of the force application handle is respectively sleeved with a force-increasing auxiliary handle, the surface of one force-increasing auxiliary handle is provided with a thumb holding sleeve, and the surface of the front end of one force application handle is provided with a quick locking assembly;

the inner side surface of the front end of the force application handle is fixedly connected with an arc-shaped strip, the other end of the arc-shaped strip extends to the outer end through the inner part of the front end of the other force application handle, and a plurality of positioning holes are formed in the surface of the arc-shaped strip in an arrayed mode.

Preferably, the quick locking assembly comprises a box body, a pressing cap, a resetting cap, a pressing rod, a guide rod and a positioning structure, wherein the box body is fixedly arranged on the front end surface of the force application handle, the pressing cap and the resetting cap are respectively arranged at the upper end of the box body, the pressing rod is fixedly connected with the lower end of the pressing cap, the guide rod is fixedly connected with the lower end of the resetting cap, the lower ends of the pressing rod and the guide rod are respectively extended to the inside of the box body, and the positioning structure is further arranged inside the front end of the force application handle.

Preferably, a baffle is arranged in the center of the box body, a rectangular through groove is formed in one side surface of the baffle, a linkage block is arranged at the lower end of the other side surface of the baffle, a guide groove is formed in the center of the inside of the linkage block, a through groove is formed in one side surface of the inner wall of the guide groove, a push rod is sleeved in the through groove, the lower end of the push rod extends to the lower end of the box body through the inside of the rectangular through groove and is connected with a mounting block, a connecting rod is fixedly connected to the lower end of the mounting block, the lower end of the connecting rod extends to the center of the inside of the positioning structure and is provided with an inclined push block, a limit disc is fixedly arranged on the upper end surface of the push rod, a reset spring is connected to the lower end of the limit disc, and the lower end of the reset spring is connected to the upper end surface of the baffle.

Preferably, one side of the surface of the mounting block is provided with a mounting groove, the inner wall of the lower end of the mounting groove is movably connected with a limit spring, the other end of the limit spring is correspondingly abutted against one side surface of the linkage block, the center of the inner side surface of the limit spring is connected with a support rod, the other end of the support rod is fixedly connected with the center of the bottom surface of the mounting groove, the lower end of the guide rod correspondingly extends into the guide groove, the lower end surface of the guide rod is connected with a compression spring, the lower end of the compression spring is connected with the inner bottom surface of the guide groove, a conical clamping block is arranged in the center of the surface of the compression spring, the lower end of the conical clamping block is correspondingly abutted against the tail end surface of the push rod, the front end of the push rod passes through the inner part of the through groove, and the surface of the support rod is correspondingly abutted against the upper end surface of the limit spring.

The positioning structure comprises a guide groove, a bolt rod, a first inclined surface push block, a connecting plate and a first compression spring, wherein the guide groove is correspondingly arranged at the front end of the inside of a force application handle, a guide through groove is formed in the center of the inside of the guide groove, a sliding groove is formed in the lower end of the guide through groove, the bolt rod is arranged at the center of the inside of the guide through groove, the first inclined surface push block is mounted on the rear end surface of the bolt rod, the upper end surface of the first inclined surface push block is attached to the lower end surface of the inclined surface push block, the lower end surface of the first inclined surface push block is connected with the connecting plate, the lower end of the connecting plate extends to the center of the inside of the sliding groove, the first compression spring is connected to the side of the connecting plate, the other end of the first compression spring is connected to the front end surface of the inside of the sliding groove, and the front end surface of the bolt rod is coaxially and correspondingly arranged with a positioning hole of an arc-shaped strip.

Preferably, the centers of the opposite surfaces of the inner sides of the pliers heads are respectively provided with a meshed tooth slot, the inner surfaces of the front ends of the pliers heads are respectively provided with a groove, the front end surfaces of the grooves are respectively connected with pliers beaks through shaft pins, the inner surfaces of the two pliers beaks are respectively provided with cutting pliers blades, the upper ends of the two pliers beaks are respectively embedded in the grooves, the centers of the upper ends of the pliers beaks are respectively provided with a positioning convex rib, the surfaces of the upper side and the lower side of each positioning convex rib are respectively provided with a threaded hole, and tooth seats are respectively correspondingly arranged at the outer ends of the two positioning convex ribs.

Preferably, the two opposite surfaces of the inner sides of the tooth holders are respectively provided with a plurality of anti-slip insections, wherein two fastening bolts are respectively arranged on the surfaces of the two tooth holders, and the lower ends of the fastening bolts are respectively connected with the inside of the threaded holes through the inside of the tooth holders.

Preferably, the arc-shaped strip passes through the inside of the front end of the other force application handle, the inside of the positioning hole corresponds to the outer end of the front end of the bolt rod, two limiting grooves are respectively formed in two sides of the surface of the force application handle, a fixed rod is arranged in each limiting groove, a positioning groove is further formed in the surface between the two limiting grooves, and a plurality of inner racks are arranged on the surface of the upper end inside the positioning groove.

Preferably, two opposite sides of the front end of the inner wall of the auxiliary reinforcing handle are respectively connected with a sliding block, the centers of the sliding blocks are respectively sleeved at the outer ends of the fixed rods in a sliding manner, threaded holes are respectively formed in the centers of the inner sides of the two auxiliary reinforcing handles, a screw rod is matched with the internal threads of the threaded holes, the lower ends of the screw rods are respectively extended to the inner parts of the inner tooth bars and are provided with connecting plates, a plurality of meshing racks are arranged on the upper surfaces of the connecting plates, the meshing racks are in meshing fit with the inner racks, the upper ends of the screw rods are respectively extended to the outer end surfaces of the auxiliary reinforcing handles, and the adjusting buttonheads are respectively connected.

Preferably, the rear end surface of the force application handle is further provided with a placing groove, and a plurality of auxiliary tool pieces are connected to the inner shaft pin of the placing groove, wherein the auxiliary tool pieces comprise one or more of a screwdriver head, an awl and a prying plate.

Compared with the prior art, the invention has the beneficial effects that:

compared with the traditional pliers for fixing the length of the force application arm, the force application arm is flexibly adjusted through the cooperative design of the force application auxiliary handle, the sliding block, the fixed rod, the screw, the meshing rack and the inner rack, when the traditional pliers face different torque demands, because the force application arm is not adjustable, a user is often required to consume more force or can not finish the operation, the force application efficiency can be obviously improved based on the lever principle by rotating the adjusting button head according to the actual working condition, for example, after the force application arm is increased when the rusted nut is disassembled, the user can easily apply more torque without assistance tools such as the force application rod, the labor saving effect is improved by more than 50%, the labor intensity is greatly reduced, the force application arm is particularly suitable for long-time high-strength operation scenes, and the design of the thumb holding sleeve further optimizes the holding experience and reduces the hand fatigue, which is difficult for the traditional pliers.

The existing pliers jaw functions are fixed, if different functions are needed, a plurality of tools are often needed to be prepared, the pliers jaw is inconvenient to carry and use, the pliers jaw head is connected with the positioning convex edges through the fastening bolts, a user can quickly detach and install the tooth seats with different specifications according to operation requirements, such as clamping workpieces with different shapes, cutting operation and the like, compared with the traditional pliers, the pliers jaw is replaced by means of complex tools and even maintenance of a factory, the pliers jaw is replaced by simply screwing the bolts, the convenience of operation is greatly improved within minutes, meanwhile, the pliers jaw is enabled to have multiple functions by means of meshing tooth grooves, cutting pliers edges, anti-slip tooth patterns and the like, tool applicability is remarkably improved, tool allocation quantity is reduced, and use cost is reduced.

The traditional pliers mainly adopt simple buckles or locking-free structures, the handles are easy to shake in the using process, the operation precision is affected, the locking and unlocking operations are complex, the product can be rapidly locked and unlocked in one hand by means of the rapid locking component and the positioning structure, the pressing cap is pressed, the bolt rod is inserted into the arc-shaped positioning hole to lock the opening and closing angle of the handles by means of linkage of the pressing rod, the inclined pushing block and other parts, the resetting cap can be rapidly unlocked by pressing, the whole process is in multistage spring linkage, the operation is simple, convenient, stable and reliable, compared with the traditional pliers in the scenes of industrial assembly, high-altitude operation and the like, the product can effectively reduce the auxiliary fixing time by more than 30%, can bear 60kgf lateral pressure to keep stable, the operation efficiency and the safety are remarkably improved, and more efficient and reliable operation experience is provided for users.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a schematic view of the surface structure of the force application handle of the present invention;

FIG. 3 is a schematic view of the front end structure of the inner wall of the reinforcing auxiliary handle;

FIG. 4 shows a binding clip according to the present invention a front end structure schematic diagram;

FIG. 5 is a schematic view of the beak structure of the pliers of the present invention;

FIG. 6 is a schematic view of the quick lock assembly of the present invention;

FIG. 7 is a further schematic view of the quick lock assembly of the present invention;

fig. 8 is a schematic view of a positioning structure according to the present invention.

The tool comprises a jaw, a 11, a tooth slot, a 12, a jaw, a 13, a cutting jaw, a 14, a positioning convex edge, a 15, a tooth holder, a 16, an anti-skid tooth trace, a 17, a fastening bolt, a 2, a force application handle, a 21, a fixed rod, a 22, an inner tooth bar, a 3, a force-increasing auxiliary handle, a 31, a sliding block, a 32, a screw, a 33, a connecting plate, a 34, a meshing rack, a 35, an adjusting button head, a 4, a thumb holding sleeve, a 5, an auxiliary tool, a 6, an arc bar, a 7, a quick locking assembly, a 71, a box body, a 72, a pressing cap, a 73, a reset cap, a 74, a pressing rod, a 75, a guide rod, a 76, a baffle plate, a 77, a linkage block, a 78, a reset spring, a 79, a mounting block, a 710, a connecting rod, a 711, a bevel pushing block, a 712, a limit spring, a 713, a supporting rod, a 714, a conical fixture, a compression spring, a 716, a push rod, a 8, a structure, a 81, a guide bar, a latch bar, a 83, a 85, a connection plate, a 85, and a compression spring.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1-8, the invention provides a technical scheme that a labor-saving pliers convenient for changing jaws is formed by connecting two pliers heads 1 and two force application handles 2 as main body structures through shaft pins to form a basic operation unit, a force-increasing auxiliary handle 3 sleeved at the outer end of the force application handles 2 can drive a meshing rack 34 to mesh with an inner toothed bar 22 through a screw 32 by means of sliding fit of a sliding block 31 and a fixed rod 21, flexible adjustment of the length of a force application arm is realized, the labor-saving effect of operation is effectively improved, and a thumb holding sleeve 4 on the surface of the force-increasing auxiliary handle 3 further optimizes holding comfort.

The quick locking assembly 7 is arranged at the front end of the force application handle 2, the pressing cap 72 drives the pressing rod 74 to link the latch rod 82 in the positioning structure 8, so that the latch rod 82 is inserted into the positioning hole of the arc-shaped strip 6, the quick locking of the opening and closing state of the handle is realized, the resetting cap 73 is matched with the guide rod 75 and related spring structures, convenience and stability of unlocking operation are ensured, the inner side of the clamp head 1 is provided with the meshed tooth groove 11, the front end of the clamp head is connected with the beak 12 with the cutting clamp blade 13 through the shaft pin, and the replaceable tooth seat 15 fixed by the fastening bolt 17 is matched, so that a user can conveniently and quickly replace jaw parts according to different operation requirements. After the use, the auxiliary tool 5 is turned back to the placing groove for storage.

According to the figures 1,2 and 3, the two sides of the outer end of the force application handle 2 are provided with limit grooves and are internally provided with fixed rods 21, the middle part of the force application handle is provided with internal racks 22, sliding blocks 31 on the two sides of the front end of the inner wall of the force application auxiliary handle 3 are in sliding sleeve joint with the fixed rods 21 to form an axial sliding guide structure, an internal threaded hole of the force application auxiliary handle is in threaded fit with a screw rod 32, a connecting plate 33 at the lower end of the screw rod 32 is provided with a meshing rack 34, and the upper end of the screw rod 32 extends to the outer end of the force application auxiliary handle 3 and is connected with an adjusting button head 35.

The screw rod 32 is driven to rotate by rotating the adjusting knob head 35, the meshing rack 34 is driven to be meshed with the inner toothed bar 22 for transmission, the position of the boosting auxiliary handle 3 relative to the force application handle 2 is stepless adjusted, the length of the force application arm is changed, the force application arm can be flexibly adjusted according to operation requirements according to the lever principle, larger torque can be generated when the same acting force is applied, the force application arm pliers are improved by more than 40% in labor saving effect compared with the traditional fixed force application arm pliers, the thumb holding sleeve 4 arranged on the surface of the boosting auxiliary handle 3 is designed in an ergonomics mode, the surface of the thumb holding sleeve 4 is processed by rubber anti-skid textures, hand curves can be tightly attached, the hand fatigue of long-time operation of more than 30% is reduced, meanwhile, the holding stability is enhanced, and no deviation of tools in the force application process is ensured.

According to the figures 1, 4 and 5, the pliers head 1 is a labor-saving pliers operation part convenient for changing the jaws, the center of the opposite surfaces of the inner side of the pliers head is provided with a meshing tooth slot 11, the friction force on a workpiece is enhanced through a saw tooth structure, the workpiece is firmly clamped, a groove at the inner side of the front end is movably connected with the pliers beak 12 through a shaft pin, a cutting pliers blade 13 is arranged at the inner side of the pliers beak 12, the cutting pliers blade 13 is reinforced through special heat treatment, materials such as metal wires and cables can be efficiently sheared, the upper end of the pliers beak 12 is embedded in the groove, the pliers head is connected with a detachable tooth holder 15 through a positioning convex edge 14, threaded holes are formed in the upper side and the lower side of the positioning convex edge 14, and the quick disassembly of the tooth holder 15 is realized by matching with fastening bolts 17 on the surface of the tooth holder 15.

The anti-slip insection 16 is arranged on the inner side of the toothholder 15, so that the clamping reliability is further enhanced, a user can change the toothholder 15 by disassembling the fastening bolt 17 according to different operation requirements, the jaw function is flexibly switched, the clamp head 1 has the clamping and cutting functions and the replaceable part structure, and the applicability and the operation convenience of the tool are obviously improved.

According to the key structure of the quick locking assembly 7 shown in fig. 1, 6 and 7, which is a labor-saving pliers convenient for replacing the jaws to realize stable operation, the box body 71 fixed at the front end of the force application handle 2 is taken as a main body, the bidirectional convenient operation of pressing locking and pressing unlocking is constructed, when the cap 72 is pressed, the pressure lever 74 connected with the box body is used for driving the mounting block 79 to move downwards along the rectangular through groove in the box body 71, the power is transmitted through the connecting rod 710, the inclined plane pushing block 711 is used for pushing the latch rod 82 in the positioning structure 8 to be inserted into the positioning hole of the arc-shaped strip 6, the opening and closing angle of the pliers handle is locked instantly, and the limit spring 712 is matched with the linkage block 77 to ensure that the locking action is free from offset.

Under special operation scene, when the reset cap 73 is pressed, the guide rod 75 descends synchronously and compresses the spring 715 to accumulate elastic potential energy, along with the downward movement of the guide rod 75, the conical clamping block 714 fixed at the center of the surface of the spring 715 moves downwards along with the downward movement, the push rod 716 is pushed by the conical surface to slide along the through groove, the front end of the push rod 716 pushes up the limit spring 712 to deform and separate from the limit constraint of the linkage block 77, at the moment, under the action of the reset spring 78, the press rod 74 drives related parts to reset rapidly, the latch rod 82 withdraws synchronously from the positioning hole to realize rapid unlocking, the trigger mechanism is linked with the multistage spring to meet the requirements of different working conditions, the rapid response operation within 1 second is realized, the locking and unlocking can be completed by one hand, the auxiliary fixing time of more than 30% is effectively reduced, the stable locking state can still be kept under the lateral pressure bearing 60kgf, and the operation efficiency and the operation safety are remarkably improved.

According to the embodiment shown in fig. 1 and 8, the positioning structure 8 is an execution unit for realizing angle locking by labor-saving pliers, and cooperates with the quick locking assembly 7, and realizes stable positioning of the opening and closing state of the force application handle through innovative design of mechanical transmission and spring reset, and the structure comprises a guide groove 81 formed at the front end inside the force application handle 2, a latch rod 82, an inclined plane pushing block one 83, a connecting plate 84 and a compression spring one 85, wherein the latch rod 82 is arranged inside the guide groove 81, and a composite guide rail is formed by a guide through groove in the center inside the guide groove 81 and a chute at the lower end so as to ensure that the latch rod 82 moves along the axial direction.

When the inclined surface pushing block 711 of the quick locking assembly 7 is pressed down, the first inclined surface pushing block 83 is pushed to drive the latch rod 82 to extend forwards and insert into the positioning hole of the arc-shaped strip 6 to form rigid locking, at the moment, the connecting plate 84 slides in the sliding groove and compresses the first compression spring 85 to store reset potential energy, and when the quick locking assembly is unlocked, the first compression spring 85 releases elastic potential energy to push the connecting plate 84 to drive the latch rod 82 to quickly reset.

The whole mechanism achieves the following effects:

Force application and boosting principle

The two clamp heads 1 and the two force application handles 2 are connected through shaft pins to form a basic operation unit, the outer ends of the force application handles 2 are sleeved with a force-increasing auxiliary handle 3, and sliding blocks 31 on two sides of the opposite surfaces of the front ends of the inner walls of the force-increasing auxiliary handle are in sliding fit with fixing rods 21 in limit grooves on two sides of the surfaces of the force application handles 2 to provide guidance for movement of the force-increasing auxiliary handle 3.

The user rotates the regulation button head 35 of the outer end of the auxiliary force-increasing handle 3, the regulation button head 35 drives the screw rod 32 to rotate, because the screw rod 32 is in threaded fit with the threaded hole on the inner side of the auxiliary force-increasing handle 3, the screw rod 32 moves in the axial direction when rotating, and then drives the meshing rack 34 on the lower end connecting plate 33 to move, the meshing rack 34 is meshed with the inner tooth bar 22 in the positioning groove of the force-increasing handle 2, the length of the force-increasing arm is regulated by changing the position of the auxiliary force-increasing handle 3 relative to the force-increasing handle 2, according to the lever principle, after the force-increasing arm grows, under the condition of applying the same acting force, larger moment can be generated, thereby effectively improving the force-increasing efficiency, realizing labor-saving operation, simultaneously, the thumb holding sleeve 4 on the surface of the auxiliary force-increasing handle 3 optimizes the human engineering design, and the surface of the thumb holding sleeve 4 adopts rubber anti-skid texture treatment, can be tightly attached to the hand curve, the holding comfort and the operation stability are enhanced, and the fatigue feeling brought by long-time use is reduced.

Jaw replacement principle

The center of the opposite surface of the inner side of the clamp head 1 is provided with a meshed tooth slot 11, and the friction force on a workpiece is enhanced through a saw tooth shape, so that stable clamping is ensured. The groove on the inner side of the front end of the clamp head 1 is movably connected with the clamp beak 12 through a shaft pin, so that the clamp beak 12 can rotate up and down in the direction perpendicular to the plane of the clamp head 1 by taking the shaft pin as the center. The cutting nipper blade 13 on the inner side of the nipper beak 12 is strengthened by special heat treatment, has high hardness and wear resistance, and can efficiently shear the materials such as metal wires, cables and the like.

The upper end of the beak 12 is embedded in the groove and is connected with the tooth holder 15 through the positioning convex rib 14. Screw holes are formed in the upper side and the lower side of the positioning convex rib 14, and fastening bolts 17 are arranged on the surface of the tooth seat 15. When a user needs to replace the jaw part, the tooth holder 15 can be detached from the positioning rib 14 only by screwing off the fastening bolt 17 by using a tool, and when a new tooth holder 15 is installed, the hole on the tooth holder 15 is aligned with the threaded hole on the positioning rib 14, and the jaw part can be quickly replaced by screwing down the fastening bolt 17. The anti-slip insection 16 that the toothholder 15 inboard was arranged has further strengthened the centre gripping reliability, and the user can be according to different operation demands, like centre gripping circular pipe fitting, square work piece etc. the toothholder 15 of different specifications or functions is switched in a flexible way, is showing the suitability and the simple operation of promotion instrument.

Handle locking and unlocking principle

The quick locking component 7 and the positioning structure 8 work cooperatively to realize the stable control of the opening and closing state of the force application handle. The quick lock assembly 7 is mainly a box 71 fixed to the front end of the force application handle 2. When the opening and closing angle of the handle is required to be locked, the pressing cap 72 is pressed, and the pressing cap 72 drives the pressing rod 74 to move downwards. The lower end of the pressing rod 74 extends to the lower end inside the box body 71 through a rectangular through groove on the baffle 76 inside the box body 71, and drives the mounting block 79 to move downwards. During the downward movement of the mounting block 79, the limiting spring 712 cooperates with the linkage block 77 to ensure the moving property of the compression bar 74.

The pressing rod 74 drives the inclined surface pushing block 711 to move downwards through the connecting rod 710, and the inclined surface pushing block 711 is attached to the inclined surface pushing block one 83 in the positioning structure 8. When the inclined surface pushing block 711 is pressed down, the first inclined surface pushing block 83 is pushed to drive the latch rod 82 to extend forwards. The latch rod 82 moves along the guide through groove at the center inside the guide groove 81, and finally is inserted into the positioning hole of the arc-shaped strip 6 to form rigid locking, so that the opening and closing angle of the pliers handles is fixed instantly, the pliers are kept stable in the operation process, and operation errors caused by shaking of the handles are avoided. At this time, the connection plate 84 slides in the slide groove at the lower end of the guide groove 81 to compress the first compression spring 85, thereby accumulating the restoring potential energy.

When unlocking is required, the reset cap 73 is pressed, the reset cap 73 drives the guide rod 75 to synchronously descend, and the compression spring 715 is compressed and stores elastic potential energy. As the guide bar 75 moves down, the tapered block 714 fixed to the center of the surface of the spring 715 moves downward, pushing the push bar 716 to slide along the through groove with the tapered surface. The front end of the push rod 716 pushes up the limit spring 712 to deform and disengage the limit constraint of the linkage block 77. At this time, under the action of the return spring 78, the compression rod 74 drives the related components to quickly return, and the latch rod 82 is pushed by the elastic potential energy released by the compression spring 85 to withdraw from the positioning hole, so as to realize quick unlocking. The whole locking and unlocking process is linked with the multi-stage spring through the trigger mechanism, the response is rapid, the operation can be completed by one hand, the auxiliary fixing time is effectively reduced, and the operation efficiency and the operation safety are improved in the operation scenes such as industrial assembly, equipment maintenance and the like.

Principle of auxiliary function

The inner shaft of the placing groove formed on the rear end surface of the force application handle 2 is connected with a plurality of auxiliary tool pieces 5 through pins, and the auxiliary tool pieces 5 comprise, but are not limited to, screwdrivers heads, awls, prying plates and the like. In the actual operation process, when the operations of screwing, punching, prying and the like are needed, a user does not need to additionally find tools, the corresponding auxiliary tool piece 5 can be directly taken out of the placing groove, and the auxiliary tool piece can be adjusted to a proper use angle through rotation of the shaft pin, so that the operation can be performed. After the use, the auxiliary tool piece 5 is turned back into the placing groove to be stored, so that the pliers have multifunction and practicability and meet diversified operation requirements.

Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.

Claims (10)

1. Labor-saving pliers convenient for changing jaws comprise two pliers heads (1) and two force application handles (2), and are characterized in that:

The front end of the force application handle (2) is respectively connected with a binding clip (1) through a shaft pin, the outer end of the force application handle (2) is respectively sleeved with a force-increasing auxiliary handle (3), the surface of one force-increasing auxiliary handle (3) is provided with a thumb holding sleeve (4), and the front end surface of one force application handle (2) is provided with a quick locking assembly (7);

The inner side surface of the front end of the force application handle (2) is fixedly connected with an arc-shaped strip (6), the other end of the arc-shaped strip (6) extends to the outer end through the inner part of the front end of the other force application handle (2), and a plurality of positioning holes are formed in the surface of the arc-shaped strip (6) in an arrangement mode.

2. The pair of labor-saving pliers convenient to replace jaws according to claim 1, wherein the quick locking assembly (7) comprises a box body (71), a pressing cap (72), a reset cap (73), a pressing rod (74), a guide rod (75) and a positioning structure (8), the box body (71) is fixedly arranged on the front end surface of the force application handle (2), the pressing cap (72) and the reset cap (73) are respectively arranged at the upper end of the box body (71), the pressing rod (74) is fixedly connected to the lower end of the pressing cap (72), the guide rod (75) is fixedly connected to the lower end of the reset cap (73), the lower ends of the pressing rod (74) and the guide rod (75) are respectively extended into the box body (71), and the positioning structure (8) is further arranged inside the front end of the force application handle (2).

3. The pair of labor-saving pliers convenient to replace jaws according to claim 2, wherein the baffle plate (76) is arranged in the center of the inside of the box body (71), a rectangular through groove is formed in one side surface of the baffle plate (76), a linkage block (77) is arranged at the lower end of the other side surface of the baffle plate, a guide groove is formed in the center of the inside of the linkage block (77), a through groove is formed in one side surface of the inner wall of the guide groove, a push rod (716) is sleeved in the through groove, the lower end of the push rod (74) extends to the lower end of the inside of the box body (71) through the inside of the rectangular through groove and is connected with a mounting block (79), a connecting rod (710) is fixedly connected to the lower end of the mounting block (79), a limit disc is fixedly arranged on the upper end surface of the push rod (74), a reset spring (78) is connected to the lower end of the limit disc, and the lower end of the reset spring (78) is connected to the upper end surface of the baffle plate (76).

4. The pair of labor-saving pliers convenient to replace jaws according to claim 3, wherein the mounting block (79) is provided with a mounting groove on one side of the surface, a limit spring (712) is movably connected to the inner wall of the lower end of the mounting groove, the other end of the limit spring (712) correspondingly abuts against one side surface of the linkage block (77), a supporting rod (713) is connected to the center of the inner side surface of the limit spring (712), the other end of the supporting rod (713) is fixedly connected to the center of the bottom surface of the mounting groove, the lower end of the guide rod (75) correspondingly extends into the guide groove, a compression spring (715) is connected to the surface of the lower end of the guide rod (75), the lower end of the compression spring (715) is connected to the bottom surface of the inside of the guide groove, a conical clamping block (714) is arranged at the center of the surface of the compression spring (715), the lower end of the conical clamping block (714) correspondingly abuts against the tail end surface of the push rod (716), and the front end of the push rod (716) correspondingly abuts against the surface of the upper end of the limit spring (712) through the inside the through groove.

5. The pair of labor-saving pliers convenient to replace jaws according to claim 2, wherein the positioning structure (8) comprises a guide groove (81), a bolt rod (82), a first inclined push block (83), a connecting plate (84) and a first compression spring (85), the guide groove (81) is correspondingly arranged at the front end inside the force application handle (2), a guide through groove is formed in the center inside the guide groove (81), a sliding groove is formed in the lower end of the guide through groove, the bolt rod (82) is arranged in the center inside the guide through groove, the first inclined push block (83) is mounted on the rear end surface of the bolt rod (82), the upper end surface of the first inclined push block (83) is attached to the lower end surface of the first inclined push block (711), the lower end surface of the first inclined push block (83) is connected with the connecting plate (84), the lower end of the connecting plate (84) extends to the inner center of the sliding groove, one side of the surface of the connecting plate (84) is connected with the first compression spring (85), the other end of the first compression spring (85) is connected to the inner front end surface of the sliding groove, the rear end of the bolt rod (82) is mounted on the rear end surface of the guide through groove, the rear end surface of the bolt rod is coaxial with the front end surface of the arc-shaped push block (6), and the front end of the bolt rod (82) is coaxial with the front end of the arc-shaped bolt rod is coaxial with the front end.

6. The labor-saving pliers convenient to replace the pliers jaw according to claim 1, wherein the centers of the opposite surfaces of the inner sides of the pliers heads (1) are respectively provided with a meshed tooth slot (11), the inner side surfaces of the front ends of the pliers heads (1) are respectively provided with grooves, the front end surfaces of the grooves are respectively connected with pliers beaks (12) through shaft pins, the inner side surfaces of the two pliers beaks (12) are respectively provided with a cutting pliers blade (13), the upper ends of the two pliers beaks (12) are respectively embedded in the grooves, the centers of the upper ends of the pliers beaks (12) are respectively provided with a positioning convex rib (14), the surfaces of the upper side and the lower side of the positioning convex ribs (14) are respectively provided with threaded holes, and tooth holders (15) are respectively correspondingly arranged at the outer ends of the two positioning convex ribs (14).

7. The pair of labor-saving pliers convenient to replace jaws according to claim 6, wherein a plurality of anti-slip dents (16) are respectively arranged on the inner opposite surfaces of the two tooth holders (15), two fastening bolts (17) are respectively arranged on the surfaces of the two tooth holders (15), and the lower ends of the fastening bolts (17) are respectively connected with the inside of the threaded holes through the inside of the tooth holders (15) in a threaded mode.

8. The labor-saving pliers convenient to replace the pliers jaw according to claim 1, wherein the arc-shaped strip (6) passes through the inside of the front end of the other force application handle (2), the inside of the positioning hole corresponds to the outer end of the front end of the bolt rod (82), two limiting grooves are respectively formed in two sides of the surface of the force application handle (2), a fixing rod (21) is arranged in each limiting groove, a positioning groove is further formed in the surface between the two limiting grooves, and a plurality of inner racks (22) are arranged on the surface of the upper end inside the positioning groove.

9. The pair of labor-saving pliers convenient to replace jaws according to claim 1, wherein two sides of the opposite surfaces of the front end of the inner wall of each boosting auxiliary handle (3) are respectively connected with a sliding block (31), the centers of the sliding blocks (31) are respectively sleeved on the outer ends of the fixed rods (21) in a sliding mode, threaded holes are respectively formed in the centers of the inner sides of the two boosting auxiliary handles (3), a screw (32) is matched with the inner threads of the threaded holes, the lower ends of the screw (32) are respectively extended to the inner parts of the inner tooth strips (22) and are provided with connecting plates (33), a plurality of meshing racks (34) are arranged on the upper surface of the connecting plates (33), the meshing racks (34) are in meshing fit with the inner tooth strips (22), and the upper ends of the screw (32) are respectively extended to the outer end surfaces of the boosting auxiliary handles (3) and are respectively connected with adjusting buttonheads (35).

10. The pair of labor-saving pliers convenient to replace the jaws according to claim 1, wherein the rear end surface of the force application handle (2) is further provided with a placing groove, a plurality of auxiliary tool pieces (5) are connected to an inner shaft pin of the placing groove, and the auxiliary tool pieces (5) comprise one or more of a screwdriver head, an awl and a prying plate.