JP2009534134A - Chair mechanism - Google Patents

Abstract

  Mechanism designed for chairs, in particular rotatable office chairs, with telescopic telescopic piston rods, with gas springs arranged vertically in the underframe, for adjusting the seat height In order to adjust the inclination of the seat back, the adjustment of the inclination of the seat is synchronized. The mechanism has its own fixed base part (20) through which a fixed first axis of rotation (D1) extends, to which the tiltable seat support is attached. It has been. A coupling means (21) on the front side is arranged between the base portion (20) and the seat support, and this coupling means is movable with the fixed third rotating shaft (D3) of the base portion (20). It is pivotally attached to the fourth rotating shaft (D4). Furthermore, the mechanism has a coupling means (24) on the rear side, which is pivotally connected to a movable sixth rotating shaft (D6) on the one hand and another rotating shaft (D5) movable on the other hand. It is pivotally attached to. In the mechanism, at least one first spring element (26) acting between the base part (20) and the seat support is provided, which spring element is pivotally connected to the fourth axis of rotation (D4). Has been. The first spring element (26), on the other hand, is pivotally attached to a movable eighth rotating shaft (D8), which is positioned by a gear unit (25) that can be operated from the outside by the user. Can be changed. The first spring element (26) is advantageously a gas spring, which can be locked by a locking element (218) that can be operated by the user, so that the seat and the backrest are in a stationary position. It is locked to.

Description

  The present invention relates to a mechanism for a chair, in particular a rotatable office chair, having a gas spring arranged vertically in an underframe for adjusting the height of the seat. This chair mechanism sinks the seat surface backward in synchronization with the rearward inclination of the seat back caused by the weight shift of the user.

Synchronizing mechanisms for chairs are often known from, for example, Patent Documents 1 to 5, and the essence has been established as a standard for comfortable work chairs.
EP 0 592 369 European Patent No. 0 839 478 EP 1 039 816 European Patent Application Publication No. 1 358 821 International Publication No. 2005/120291 Pamphlet

  In connection with the known prior art, the problem underlying the present invention is to propose a further improved chair mechanism that is sensitive to weight shift. Another challenge is to facilitate adjustment of the ledge of the mechanism for people who are not so heavy or light. The next problem is to freely form a mechanism in order to allow various types of coupling between the seat back and the armrest.

  This problem is solved by a mechanism having the features of claim 1. The mechanism is for a chair, in particular a rotatable office chair, with a gas spring arranged vertically in an underframe, with a telescopic telescopic piston rod for adjusting the seat height. Is set for. The seat tilt adjustment is synchronized to adjust the seat back tilt. The mechanism has its own fixed base part, through which a fixed first axis of rotation extends, to which a tiltable seat support is attached. A front-side coupling means is disposed between the base portion and the seat support, and this coupling means is pivotally attached to a fixed third rotating shaft and a movable fourth rotating shaft of the base portion. The coupling means on the rear side is pivotally connected to a movable sixth rotating shaft on the one hand, and is pivoted to another movable rotating shaft on the other hand. In the mechanism, at least one first spring element acting between the base portion and the seat support is provided, which spring element is pivotally connected to the fourth axis of rotation. On the other hand, the first spring element is pivotally attached to a movable eighth rotating shaft, and the position of the rotating shaft can be changed by a gear unit that can be operated from the outside by the user.

  In the following, a special embodiment of the invention is defined: the gear unit has a fixed second rotating shaft extending through the base portion, an eighth rotating shaft, and a movable ninth rotating shaft. It is pivotally attached. At least in principle, at a rest position in which the seat is horizontal and the seat back is vertical, the second rotational axis, the eighth rotational axis, and the ninth rotational axis are at least essentially perpendicular to each other. In the relaxed position where the seat is tilted to the maximum and the seat back is tilted to the maximum complementary, the eighth rotation axis moves in the direction of the third rotation axis before the second rotation axis; The ninth axis of rotation moves in the opposite direction after the second axis of rotation.

  The first spring element is a gas spring having a cylinder and a telescopic telescopic piston rod, and the piston rod extends to a maximum at a stationary position when the eighth rotating shaft is adjusted downward as much as possible. It is shrunk to the maximum at the relaxed position when the eighth rotation axis is adjusted upward as much as possible. The piston rod is pivotally attached to the fourth rotation shaft by the intermediate member.

  The spring units are positioned in pairs in the mechanism, and these spring units are supported on the one hand in the bearing of the base part and on the other hand in the bearing bracket under the bearing frame, Attached on both sides of the base part. The bearing frame is made of synthetic resin, thereby constituting a self-lubricating bearing location together with the metal parts to be attached.

  The coupling means on the front side is formed as a plate-like lever, through which the third and fourth rotation shafts extend. The coupling means on the back side includes a sixth shaft rod and a sleeve member coupled to the shaft rod via an arm, or a sixth shaft rod coupled to the shaft rod via an arm. The fifth, sixth and seventh rotating shafts attached thereto extend through the shaft rod and the sleeve member.

  In order to fix the seat back, at the first rotation axis, a back support can be pivotally attached to the base portion, or a pair of rungs can be pivotally attached to the outside of the base portion. The bearing frame includes a pin for insertion into the front lever and the intermediate member. In addition, a ninth shaft bar penetrating the gear unit is accommodated, and a bearing portion for accommodating the sixth shaft rod is provided.

  In order to provide a selectively switchable lock of the gas spring, a locking element operable by the user is arranged on the intermediate member. The locking element acts on the valve stem guided in the piston rod of the gas spring.

  A detailed description of embodiments of the mechanism according to the invention and its function is given below with reference to the accompanying drawings.

  For further explanation overall, the following conventions apply: If a figure contains a sign for clarity of the figure but is not explained in the direct description, it will be referred to that reference in the figure description already given. I want. For the sake of clarity, repeated notation of parts in subsequent figures is usually omitted, but it can be uniquely identified from the figures that parts are repeated.

<Description of FIGS. 1A to 1C>

  The mechanism 2 according to the invention is mounted on a height-adjusting gas spring which is inserted into a leg 10 whose column 11 typically comprises a roller-like ground element 13 in particular. It is. Here, the star-shaped leg portion 10 constitutes the underframe 1 together with the support 11, the height adjusting gas spring 12 and the installation element 13. The upper end of the height adjusting gas spring 12 is in principle inserted into a shell-like base portion 20, which is the lowest part of the mechanism 2 and seat support 22 set on it. To accommodate. The plate-like front lever 21 with the locking element 218 protruding into the inside thereof is pivoted on the front area of the base portion 20 on the one hand and supports the front area of the seat support 22 on the other hand from below. A first lever 31 for adjusting the preload of the mechanism 2 protrudes from one side of the seat support 22, and a second lever 32 for adjusting the seat front end position of the seat 4 from the other side. Then, the third lever 30 for operating the height adjusting gas spring 12 protrudes. The seat 4 essentially consists of a lower cushion plate 40 and a cushion 46 disposed thereon. In this configuration shown, one cross 6 is pivotally mounted from both outside on both sides of the mechanism 2, and the cross is bent and extends upward, each carrying one rest support 71. In addition, the armrest 7 having the upper cushion 70 is fixed. A backrest 5 is accommodated between the crosspieces 6.

In the rest position of FIG. 1B, the upper surface of the seat 4 is at a substantially horizontal seat slope S ₀ and the backrest 5 has a substantially vertical rest slope R ₀ associated therewith. Relax position of FIG. 1C, the upper surface of the seat 4 is moved to the maximum sheet sloped S _max, the backrest 5 occupies the maximum rest inclination R _max in synchronization therewith. Therefore, the inclination of the seat 4 is variable via the seat angle α, and the inclination of the backrest 5 is variable via the rest angle β.

<Description of FIGS. 2A and 2B>

Mechanism 2 consists essentially of the following assembly:
A base portion 20 having two first axles A1, a shock absorber 209 and two caps 2033;
A front lever 21 having a third axle A3, a locking element 218, a rocker lever 219, an adjusting screw 2190, a bush 236;
A seat support 22 with screws 2209;
The gear unit 25;
A gas spring 26;
An intermediate member 27 having a bush 236;
-Two spring units 28;
-Two bearing frames 29;
A third lever 30 having a rod 300;
A first lever 31 having a rod 310;
The back support of the first variation having two first shaft rods A1 positioned on the first rotation axis D1, a bush 236, and a fifth shaft rod A5 located on the fifth rotation shaft D5. 23 or second support back support 23 ';
The first variation back lever with the fourth bushing 246 or the second variation back lever 24 '(seventh rotation parallel to the sixth rotation axis D6 through the back levers 24, 24'). Axis D7 extends),
A selective pair of rungs 6 through which the first rotation axis D1 and the seventh rotation axis D7 pass;
A cushion plate 40 having no seat front end position adjusting unit or a cushion plate 40 'having a seat front end position adjusting unit.

<Description of FIGS. 3A and 3B>

  The base portion 20 first includes a bottom 200, a first side wall 201 adjacent to the bottom 200, a second side wall facing the bottom 200, a front wall 203, and a conical housing part 204 positioned at the rear center part thereof. The conical housing portion is surrounded by a U-shape by the middle wall 205. Two high bearings oriented one above the other in the form of brackets, each having one hole 2060 for receiving the second axle rod A2 so as to be arranged from the bottom 200 in front of the cone receiving part 204 A web 206 stands and the second axis of rotation D2 extends through this hole. Between each bearing web 206 and adjacent side walls 201, 202 there is a bearing 207, which is made up of countersunk ribs rising from the bottom 200, which are below the holes 2060. End. Since the inner wall 208 is attached to the back side of the two rear extension parts 2013 and 2023 of the side walls 201 and 202 with an interval between them, there is one each between the extension parts 2013 and 2023 and the side walls 201 and 202. Space is created. A stabilizing lateral web 2051 extends between the middle wall 205 and the cone receiving portion 204 having the inner cone 2040. The joints of the extensions 2013 and 2023 are each provided with one hole 2012, which is aligned with the hole 2050 in the inner wall 205, which in turn is also a hole in the inner wall 208. Align with 2080. An eye 2081 is connected to the hole 2080, and the eye is located in each space between the inner wall 208 and the attached side walls 201, 202. The holes 2012, 2080, and 2050 aligned with each other together with the eye 2081 constitute one accommodating portion for each of the two first shaft rods A1 on the first rotation axis D1. A block-shaped support base 2082 is positioned between the cone housing portion 204 and the second side wall 202.

  Towards the front, both side walls 201, 202 end with one front eye 2031 each with a front wall 203 positioned therebetween. Extending through the front eye 2031 is a respective one of the holes 2032 aligned with each other for receiving the third shaft rod A3, which third shaft rod is located on the third rotation axis D3. In order to close the hole 2032 when the shaft rod A3 is inserted from the outside, one cap 2033 is provided.

<Description of FIGS. 4A and 4B>

  The plate-like front lever 21 is essentially parallel to the bottom 210, the side wall 211 having an essentially triangular notch connected to the bottom 210 at an angle, and the bottom surface of the bottom 210. Consisting of two longitudinal webs 212 extending in the longitudinal direction. The longitudinal webs 212 each transition to a first eye 214 on the one hand and each to a second eye 216 on the other hand. An outwardly curved shell-shaped axial web 213 extends between the two first eyes 214, each first eye 214 having a hole 215 and passing through the two holes 215 aligned with each other. The rotation axis D3 extends. Each second eye 216 has a hole 217 that is aligned with each other and extends through a fourth axis of rotation D4. From the region of the second eye 216, the height of the side wall 211 rises in the direction of the first eye 214. The bottom 210 has a cavity 2100 between both second eyes 216, in which the locking element 218 is located.

<Explanation of FIGS. 5A and 5B>

  The seat support 22 having a bottom 220, two side walls 221, 222 extending downward, and a rear wall 223 joining one side of the side walls 221, 222 provides a kind of cover for the base portion 20. Constitute. The side walls 221 and 222 are vertically connected to the lower surface of the bottom 220 whose outer edge is offset inward. In parallel with the rear wall 223, a stopper plate 226 having a low height stands from the lower surface of the bottom 220, and reinforcing ribs 225 are provided between the side walls 221 and 222 and the lower surface of the bottom 220. A number of first screw holes 229 extend through the bottom 220, and a mating contour 2299 stands on the rear wall 223 on the top surface. There is a locking portion 227 on the top surface of the edge bottom 220 which is offset inward. The first side wall 221 has a through portion 224. A second screw hole 228, a protruding threaded cone 2291, and a third screw hole after the penetrating part 224 are symmetrically formed in the stripe-shaped outer region of the bottom 220, as viewed from the front in the direction of the rear wall 223. 2292, another second threaded hole 228, another threaded cone 2291, and finally a third threaded hole 2292.

<Description of FIGS. 6A to 6D>

  The gear unit 25 includes a first case portion 250, a second case portion 251, a driving element 252, a spindle screw 253, an eighth shaft A8 having an inner screw 254, and two second shaft portions. It consists of a bush 255 and a third bush 256. A first axial hole 2502 and a second axial hole 2503 extend horizontally through the first case portion 250 and are aligned with the ninth rotational axis D9 or the second rotational axis D2. Located to do. From the first case portion 250, a cylindrical projection 2500 having a center hole 2501 projects horizontally outward. A screw hole 2507 is provided on the inner surface. The second case portion 251 includes a consistent screw hole 2517, a first axial hole 2512 located on the ninth rotational axis D9, and a second axial hole located on the second rotational axis D2. 2513, and these axial holes are positioned so as to coincide with the screw holes 2507 or the axial holes 2502, 2503. A collar 2514 rises from the inner surface, and a counterbore guide 2515 and a long hole 2516 exist below the collar 2514.

  In the assembled state, the screw holes 2507 and 2517 are used to connect the case portions 250 and 251 together. The first bevel gear 2524 of the drive element 252 is located without the bearing recess 2504 and its shaft portion 2520 protrudes into the cylindrical projection 2500, so that the inner polygon 2521 of the shaft portion 2520 defines the center hole 2501. Work is possible. The collar 2514 maintains the position of the drive element 252 and the second bevel gear 2534 of the spindle screw 253 engages the first bevel gear 2524, in which case the spindle screw 253 is located within the guide 2515, The outer screw 2535 engages with the inner screw 254 of the eighth shaft A8. The ninth shaft rod A9 passes through the axial holes 2502 and 2512 and projects out of the case portions 250 and 251 respectively. The third bushing 256 is inserted into the second axial holes 2503 and 2513 from the outside, respectively. The gas spring 26 to be pivotally attached to the gear unit 25 within the eighth rotating shaft has a U-shaped clamp portion 261 at one end, the center portion is thickened in the through-hole, and the threaded pin 2540 on the outside. An eighth shaft bar A8 having As the second bushing 255 is screwed onto each threaded pin 2540, the clamp portion 261 is tightened and each one bushing head 2550 is positioned within the elongated hole 2516 or the complementary elongated hole of the first case portion 250. To do. A cylinder 260 having a long gas spring 26 is attached to the clamp portion 261, and a piston rod 262 protrudes from the cylinder 260. The piston rod is fixed to the intermediate member 27 by a connecting portion 263 attached to the intermediate member 27. .

  The intermediate member 27 first has a horizontally located bolt 274 with one blind hole 270 on each side. The fourth rotation axis D4 extends in the extending direction of the both blind holes 270. In the center of the bolt 274, a fork-like segment 271 extends downwards, this fork-like segment comprising two perforations at the free ends of two wing-like parts parallel to each other, the perforations being the first And used to house the second axial pins 272, 273. By means of the second axial pin 273, the rocker lever 219 is tiltably fixed in the space between the wing-like parts of the fork-like segment 271. The rocker lever 219 protrudes into a cavity positioned at the center of the bolt 274 and ends to align with the piston rod 262. Similarly, the locking element 218 is tiltably secured by a first axial pin 272 that extends through the fork-like segment 271. At the end protruding into the bolt 274, the rocker lever 219 is provided with an adjusting screw 2190, which is oriented in the direction of the end of the piston rod 262 of the gas spring 26 and guided into the piston rod 262. Press the stem that is under the preload.

<Explanation of FIGS. 7A and 7B>

  The spring unit 28 includes a first spring guide 280, a second spring guide 285, and a coil spring 289 accommodated therebetween. A first bearing head 281 is provided in the first spring guide 280, and a first shaft 282 is connected to the bearing head, and a pin 283 extends in the axial direction from the first shaft. The second spring guide 285 has a second bearing head 286, to which a second shaft 287 having an axial hole 288 is connected. In the assembled state, the pin 283 is inserted into the hole 288 movably in the axial direction, and the end of the coil spring 289 is positioned on the shafts 282 and 287. During maximum compression of the spring unit 28, the leading edges of the shafts 282, 287 abut each other, thereby limiting further deflection of the spring. The outer ends of the bearing heads 281 and 286 are rounded, the eleventh rotation axis D11 extends through the first bearing head 281, and the tenth rotation axis passes through the second bearing head 286. D10 extends.

<Description of FIGS. 8A and 8B>

  The paired bearing frames 29 formed as the left and right bearing frames 29 each have a bottom 290 that is positioned horizontally and an outer side wall 291 that protrudes downward. The front of the bearing frame 29 ends with a first eye 292, and the first eye moves laterally to a pin-shaped protrusion 2920, and is positioned on the fourth rotation axis D4 from the pin-shaped protrusion. As shown, the pin-like extension 2921 extends in the axial direction. A reinforcing bracket 2900 and a bearing bracket 293 having a bearing recess 2930 are attached between the side wall 291 and the bottom 290. At the other end, the bearing frame 29 has a second eye 297 having a hole 298 through which the sixth rotation axis D6 extends and a nose 2970 on the end face side, which penetrate horizontally. A third eye 294 having a hole 295 is present on the lower surface of the bottom 290 in front of the second eye 297, and the ninth rotation axis D9 extends through this hole. Reinforcing ribs 2900 for the side walls 291 extend on both sides of the third eye 294. A through-hole 2910 exists in the vicinity of the second eye 297 on the side wall 291 of the right bearing frame 29. One screw hole 299 is provided in the bottom 290 in the vicinity of both outer eyes 292 and 297, and the center eye 294 has screw holes 299 on both sides. Another screw hole 299 opens into the top surface of the bottom 290 and extends into the bearing bracket 293.

<Description of FIG. 9A>

  The back support 23 of the first variation is an essentially U-shaped plate part having a bottom 230 and bent portions constituting the side walls 231 on both outer sides parallel to each other. Extending through the side walls 231 are two front axial holes 232 and rear axial holes 235 that are aligned with each other. When assembled, the flange side of the first bush 236 is attached to the front axial hole 232 from the outside, and the bush shaft is set to be inserted into the eye 2981 and accommodate the first shaft rod A1. The shaft rod is located on the first rotation axis D1. A stopper 233 is bent upward from the bottom 230 in the vicinity of the first rotation axis D1. There are two holes 234 in the bottom 230 in line with the stopper 233. The rear axial hole 235 is used to accommodate the fifth shaft rod A5 located on the fifth rotation axis D5.

<Description of FIG. 9B>

  The back support 23 ′ of the second variation is an angle member having a bottom 230 ′ and bent portions constituting the side walls 231 ′ on both outer sides parallel to each other. A second leg 238 'oriented upward is connected to the first leg 237'. Extending through the side walls 231 'in the region of the first leg 237' are two front axial holes 232 'and a rear axial hole 235', which are aligned with each other. When assembled, the first bushing 236 is also mounted on the flange side of the first axial hole 232 ′ from the outside, and the bushing shaft is inserted into the eye 2981 to receive the first shaft rod A 1. The shaft rod is located on the first rotation axis D1. There is a hole 234 'in the bottom 230' of the transition between the legs 237 ', 238'. The rear axial hole 235 'is used to accommodate a fifth shaft rod A5 which is also located on the fifth rotation axis D5.

<Description of FIG. 10A>

  The back lever 24 of the first variation includes a sixth shaft rod A6 from which a sixth rotation axis D6 extends and a sleeve member 240 disposed in parallel thereto, and the sixth shaft rod A6. And the sleeve member 240 are connected to each other by two arms 242 bent upward in parallel with each other. The through hole 241 and the fifth rotation axis D5 extend through the sleeve member 240. A fourth bush 246 is provided for insertion into the openings on both outer sides of the through hole, and the flange side limits the insertion depth of the bush 246.

<Description of FIG. 10B>

  The back lever 24 'of the second variation is composed of a sixth shaft rod A6 from which a sixth rotation axis D6 extends, and a seventh shaft rod A7 arranged in parallel to the sixth shaft rod A6. The rods A6 and A7 are connected by two arms 242 ′ bent upward in parallel with each other. The ends of the shaft rods A6 and A7 project from the arm 242 ', and the seventh shaft rod A7 ends as a pin 241' tapered on both sides. For attachment to the pin 241 ', a fourth bushing 246 is used, with the bushing axis pointing outward.

<Description of FIG. 10C>

  The crosspieces 6 provided in pairs are divided into a first branch portion 60 and a second branch portion 63 bent upward from the first branch portion 60, and the second branch portion is a connection contour 630 for fixing the backrest 5. Is provided. The head portion 61 that ends freely is provided with a horizontally provided blind hole 610 whose extension portion is located on the first rotation axis D1. An inwardly directed pin 62 with a blind hole 620 provided therein projects from substantially the center of the first branch 60, and its extension is located on the seventh rotational axis.

<Description of FIG. 11A>

  This rectangular cushion plate 40 is used when seat front end position adjustment is not desired. On the upper surfaces of both outer edges extending in the longitudinal direction, one step portion 43 is provided, which is positioned lower. On each step portion 43, a threaded cone 44 having an internal thread and a hole 48 adjacent thereto are provided.

<Description of FIGS. 11B and 11C>

  Similarly, the rectangular cushion plate 40 ′ is used when the seat front end position adjustment is desired. An elongated hole 41 ′ having a keyhole-like contour on the lower surface is positioned in the corner area. Adjacent to the long hole 41 ′, screw holes 42 ′ are opened on the lower surface. On the rear narrow side, the cushion plate 40 ′ has a fixed contour 45 ′ for cooperating with a mating contour 2299 on the upper surface of the seat support 22.

<Description of FIGS. 12A and 12B>

  The front lever 21 is pivotally attached to the fourth rotation axis D4 of the intermediate member 27 coupled to the gas spring 26, and the bolt 274 is positioned in the extending direction of the fourth rotation axis D4. A fork-like segment 271 oriented downward from the bolt 274 and a locking element 218 fixed thereto are partially disposed in a space 2100 in the bottom 210 of the front lever 21. In the position indicated by the locking element 218, the locking element is tilted to the lower switching position, thereby providing free space for the rocker lever 219, so that the valve stem is directed in the direction of the adjusting screw 2190 in the reverse direction. Can move. As a result, the gas spring 26 is locked. At the time of switching, the rocker lever 219 in which the adjustment screw 2190 is located is pressed against the valve stem, and the valve stem moves in the direction of the gas spring 26 against the preload, thereby releasing the lock. Both switching states are stable.

<Description of FIGS. 13A to 13H>

  Based on the order of these drawings, the stepwise assembly of the mechanism 2 and the cooperation of each component combined with the back support 23 of the first variation will be described.

-First assembly stage (Fig. 13A)-
Since the front lever 21 is mounted at a position between the front eyes 2031 of the base portion by the axial web 213 and the two first eyes 214, the holes 2032 and 215 are aligned with each other and the third axle A3 Thus, the third rotation axis D3 functions and the front lever 21 can turn. In order to reduce metal friction, a first bushing 236 is positioned between the front eye 2031 and the first eye 214 and is inserted on the third axle A3. The cap 2033 is pushed into the hole 2032 to cover the inserted third shaft A3. Between the extensions 2013 and 2023 of the rear portion of the base portion 20, the back support 23 is inserted with the front axial holes 232 first, and these axial holes 232 are aligned with the holes 2012, 2050 and 2080. The first shaft rod A1 for constituting the first rotation axis D1 can be inserted from both sides. In order to reduce metal wear, the first bushing 236 is positioned between the side wall 231 and the inner wall 208 and inserted on the first shaft A1. The back support 23 can turn around the first rotation axis D1. The rod 300 of the third lever 30 for operating the height adjusting gas spring 12 is fixed on the support base 2082 by the support clamp 301, and the rod 300 protrudes outward through the penetration portion 2021. A cushioning component 209 is inserted between the bearing web 206 and the conical housing portion 204. In the stationary position, the stopper 233 contacts the middle wall 205, thereby preventing the seat 4 and the backrest 5 from being inclined forward.

-Second assembly stage (Fig. 13B)-
The pre-assembled gear unit 25, with the gas spring 26 and intermediate member assembled, has a bearing web in which the second axial holes 2503, 2513 are aligned with the holes 2060 for inserting the second shaft A2. At a position between 206. Therefore, the gear unit 25 is movable around the second rotation axis D2. An intermediate member 27 attached to the gas spring 26 exists between the second eyes 216. A first bushing 236 is inserted between the second eye 216 and the bolt 274 of the intermediate member 27 to reduce friction. The fixing of the intermediate member 27 between the second eyes 216 will be described with reference to FIG. 13E.

-Third assembly stage (Fig. 13C)-
Since both the spring units 28 are inserted into the bearings 207 and the second bearing heads 286 below the spring units 28 are inserted, the tenth rotation axis D10 is generated so as to penetrate the second bearing heads 286 below, and upwards. An eleventh through shaft D11 is provided so as to penetrate the first bearing head 281.

-Fourth assembly stage (Fig. 13D)-
In order to attach the back lever 24 to the back support 23, the through hole 241 is aligned with the rear axial hole 235, so that the fifth shaft A5 can be inserted. In order to reduce the friction, a fourth bush 246 is inserted between the sleeve member 240 and the side wall 231. As a result, the back lever 24 can turn around the fifth rotation axis D5, and the sixth shaft A6 of the back lever 24 constitutes the sixth rotation axis D6.

-Fifth assembly stage (Fig. 13E)-
The bearing frame 29 is attached to the mechanism 2 pre-assembled so far from both sides. In this case, the pin-shaped protrusion 2920 enters the hole 217, and the pin-shaped extensions 2921 respectively engage with the blind holes 270 of the bolts 274 of the intermediate member 27. The end portion of the ninth shaft rod A9 protruding from the gear unit 25 on both sides protrudes into the hole 295 of the third eye 294 of the bearing frame 29. The end of the sixth shaft A6 of the back lever 24 is located in the hole 298 of the second eye 297. In addition, the first bearing heads 281 of the two spring units 28 are positioned in the bearing recess 2930 on the lower surface of the bearing frame 29, thereby generating the eleventh rotation axis D11. Particularly advantageously, the bearing frame 29 is made of synthetic resin and the parts connected to it are made of metal, so that self-lubricating bearing points are produced.

-Sixth assembly stage (FIGS. 13F to 13H)-
Finally, the seat support 22 is assembled and screwed from above through the first screw holes 229 located in the inner region of the bottom 220, the distribution of the first screw holes being the screws present in the bearing frame 29. Matches hole 299. In order to operate the gear unit 25 for adjusting the preload of the mechanism 2, the rod 310 (see FIG. 2A) is inserted into the through hole 2501 and further inserted into the inner polygon 2521. The rotation causes the drive element 252 to rotate, and the drive element moves the spindle screw 253, thereby moving the eighth shaft A8 up and down, and finally adjusting the lever ratio of the mechanism 2 in the lateral hole of the seat support 22 Through 224, the first lever 31 is inserted onto the end of the rod 310 protruding outward. When the eighth rotation axis D8 is lowered to the maximum, the chair suits a light person, and when the eighth rotation axis D8 is raised to the maximum, it fits a heavy person.

  A third screw hole 2292 provided in pairs on each side of the seat support 22 is reserved for selective fixing of the armrest 7. Similarly, the second screw holes 228 provided in pairs are used to screw the non-adjustable cushion plate 40 from below. When attaching the cushion plate 40 ′ whose seat front end position can be adjusted, the screw is screwed into the threaded cone 2291 from above, and the screw head is introduced through the keyhole-shaped elongated hole 41 ′ on the lower surface of the cushion plate 40 ′. The cushion plate 40 'can be moved.

<Description of FIGS. 14A to 14D>

  In the order of this figure, the use of a second variation of the back support 23 'which is also used in combination with the first variation of the back lever 24 is illustrated. The pivoting to the first and fifth rotating shafts D1 and D5 is basically the same, but the back leg 23 is fixed to the back leg 5 by the second leg 238 'protruding upward by the back support 23'. Therefore, in the case of the back support 23 of the first variation, the backrest 5 is connected to the straight end portion.

<Description of FIGS. 15A to 15C>

  The selective fastening of the backrest 5 provides for the use of the cross 6 in connection with the second variation of the back lever 24 '. In this case, the outer end of the sixth shaft rod A6 is similarly accommodated in the hole 298 of the second eye 297 in the bearing frame 29, and forms the sixth rotation axis D6 there. The outer pin 241 ′ of the seventh shaft A 7 is inserted into the blind hole 620 of the pin 62 of the cross 6 by inserting the fourth bush 246, thereby constituting the seventh rotation axis D 7. The head portion 61 having the blind hole 610 of the crosspiece 6 is pivotally attached to the first rotation axis D1 on the outer surface of the side walls 201 and 202 of the base portion 20.

<Description of FIGS. 16A to 16D>

  The base portion 20 is fixed at each position except for the height adjusting portion and the free rotating motion portion. In the rest position, the seat support 22 is in a horizontal position and the backrest 5 is oriented substantially vertically. The fourth rotation axis D4 is supported in front of the third rotation axis D3 that does not change, and the front lever 21 occupies the minimum inclined position with respect to the horizontal. The eleventh rotation axis D11 is supported in front of the tenth rotation axis D10 as much as possible, and the spring unit 28 occupies the minimum inclined position with respect to the horizontal. The ninth rotation axis D9, the unchanged second rotation axis D2, and the eighth rotation axis D8 are superposed vertically in principle. The sixth axis of rotation D6 is at the maximum height level on the unchanged first axis of rotation D1 with the smallest vertical offset relative to the fifth axis of rotation D5 currently at the maximum height level. . When the eighth rotation axis D8 is adjusted downward as much as possible, the piston rod 262 of the gas spring 26 extends to the maximum, and the lever arm between the second rotation axis D2 and the eighth rotation axis D8 is similarly maximum. Therefore, a small force is sufficient to move a person sitting in a chair backward to a relaxed position. When the eighth rotation axis D8 is adjusted upward as much as possible, the piston rod 262 of the gas spring 26 extends slightly and the lever arm between the second rotation axis D2 and the eighth rotation axis D8 is also short. In order for a sitting person to move backward to a relaxed position, a large force that occurs when the weight is heavy is required.

<Description of FIGS. 17A to 17D>

  In the relaxed position, the seat support 22 rises forward, falls backward, and moves toward the backrest 5, that is, occupies an inclined position synchronized with the backrest 5 inclined backward. This presupposes that the gas spring 26 is in an unlocked switching position, i.e. the locking element 218 is tilted upward. The fourth rotation axis D4 is supported slightly in front of the unchanged third rotation axis D3, and the front lever 21 occupies the maximum inclined position with respect to the horizontal. The eleventh rotation axis D11 is supported at a minimum before the tenth rotation axis D10, and the spring unit 28 occupies the maximum inclined position with respect to the horizontal. The ninth rotation axis D9 moves after the unchanged second rotation axis D2, and the eighth rotation axis D8 is supported in front of the second rotation axis D2. The sixth rotation axis D6 is at the minimum height level on the unchanged first rotation axis D1 having the greatest misalignment direction in relation to the fifth rotation axis D5 which is currently at the lowest height level. is there. The spring unit 28 is compressed to the maximum, and the piston rod 216 of the gas spring 26 is contracted to the maximum, so that the backrest 5 and the seat support 22 are automatically and rested together with the seat 4 when a predetermined load is reduced. Pushed back.

<Description of FIG. 18>

  This axis diagram in which the rest position and the relaxed position are overlapped is further shown as invariant first to third rotation axes D1, D2, and D3 indicated by black circles, and important variable fourth to fourth movements that move around this axis. 6 and the positions of the eighth to ninth rotation axes D4, D5, D6, D8, and D9. Here, the similarly changing eleventh rotation axis D11 located in the spring unit 28 is not shown. On the other hand, the lower tenth rotation axis D10 passing through the spring unit 28 hardly changes. When the pair of crosspieces 6 is used, the position of the seventh rotation axis D7 also changes.

1 shows a perspective view of a chair having a mechanism according to the invention using crossbars as viewed from below. FIG. 1B shows the chair of FIG. 1A in a rest position in a side view. 1B shows the chair of FIG. 1A in a relaxed position in side view. The essential assembly of the mechanism is shown in exploded view. Variations of the back support, back lever and cushion plate and a pair of rungs are shown in exploded view. The base part which has a some shaft rod is shown with the perspective view which looked at from the top. 3B is a perspective view of the base portion of FIG. 3A viewed from below. It shows with the perspective view which looked at the front lever from the top. FIG. 4B is a perspective view of the front lever of FIG. 4A viewed from below. The seat support is shown in a perspective view from below. FIG. 5B is a perspective view of the seat support of FIG. 5A as viewed from above. The gear unit which attached the gas spring and the volt | bolt is shown with an exploded view. FIG. 6B shows the assembly of FIG. 6A partially assembled. The assembled assembly of FIG. 6A is shown in perspective view. FIG. 6C is a perspective view of the assembly of FIG. 6C viewed from a different direction. The assembled spring unit is shown. The spring unit of FIG. 7A is shown in an exploded view. A pair of bearing frames are shown by the perspective view seen from the bottom. It is shown with the perspective view which looked at the bearing frame of FIG. 8A from the top. The back support of the 1st variation which has a shaft bar is shown with the perspective view seen from the top. The back support of the 2nd variation which has a shaft bar is shown with the perspective view seen from the top. The back lever of the 1st variation which has a bush is shown with a perspective view. The back lever of the 2nd variation which has a bush is shown with a perspective view. A pair of rungs is shown in a perspective view. It is shown with the perspective view which looked at the cushion plate which cannot adjust a position from the top. The cushion plate which can adjust a position is shown with the perspective view seen from the top. It is shown with the perspective view which looked at the cushion plate of FIG. 11B from the bottom. The front lever which attached the intermediate member and the gas spring is shown with the perspective view seen from the top. FIG. 12B is a perspective view of the assembly of FIG. 12A viewed from below. Fig. 3 shows a first assembly stage mechanism with a first variation of the back support. The scalpel mechanism of the second assembly stage having the back support of the first variation. Fig. 6 shows a third assembly stage mechanism with a first variation of the back support. FIG. 6 shows a fourth assembly stage mechanism having a first variation back support and a first variation back lever; FIG. FIG. 10 shows a fifth assembly stage mechanism having a first variation back support and a first variation back lever; FIG. FIG. 9 shows a sixth assembly stage mechanism having a first variation back support and a first variation back lever; FIG. FIG. 13F is a perspective view of the assembly of FIG. 13F viewed from a different direction. FIG. 13F is a perspective view of the assembly of FIG. 13F viewed from below. The mechanism which has a back support of the 2nd variation and a back lever of the 1st variation is shown. FIG. 14B is a perspective view from above of the assembly of FIG. 14A with a seat support attached. FIG. 14B is a perspective view of the assembly of FIG. 14B with the seat back attached as viewed from above. FIG. 14C is a perspective view of the assembly of FIG. 14C viewed from below. The mechanism which has the back lever of a 2nd variation, and a pair of crosspieces is shown with an exploded view. 15B shows the assembled assembly of FIG. 15A. The perspective view which looked at the assembly of 15B which attached the seat support from the bottom is shown. A mechanism having a back support of the second variation is shown in a stationary position as a functional principle. FIG. 16A is a vertical cross-sectional view with the assembly of FIG. 16A displaced. FIG. 16A is a vertical cross-sectional view of the assembly of FIG. 16A newly displaced. The axis diagram is shown in the rest position. The assembly of 16A is shown in a vertical section in a relaxed position as a functional principle. It is the vertical sectional view which displaced the assembly of 17A. 17A is a vertical sectional view of a newly displaced assembly 17A. An axis diagram is shown in the relaxed position. An axis diagram in which the rest position and the relax position are overlapped is shown.

Explanation of symbols

1 Underframe 2 Mechanism 5 Backrest

6 Crossing 60 First branch 61 Head part 610 Blind hole 62 Pin 620 Blind hole 63 Second branch 630 Connection outline D1 First rotation axis D7 Seventh rotation axis

7 Armrest 10 Leg 11 Strut 12 Height Adjusting Gas Spring 13 Grounding Element

20 base portion 200 bottom 201 first side wall 2012 hole 2013 extension part 202 second side wall 2021 penetration part 2023 extension part 203 front wall 2031 front eye 2032 hole 2033 cap 204 cone housing part 2040 inner cone 205 middle wall 2050 hole 2051 side Directional web 206 Bearing web 2060 Hole 207 Bearing 208 Inner wall 2080 Hole 2081 Eye 2082 Support base 209 Buffer part A1 First shaft rod A2 Second shaft rod A3 Third shaft rod D1 First rotation shaft D2 Second rotation Axis D3 Third axis of rotation

21 Front lever 211 Side wall 2100 Empty space 212 Longitudinal web 213 Axial web 214 Eye 215 Hole 216 Eye 217 Hole 218 Locking element 219 Rocker lever 2190 Adjustment screw 236 First bush A3 Third shaft rod D3 Third rotating shaft D4 4th rotation axis

22 seat support 220 bottom 2209 screw 221 first side wall 222 second side wall 223 rear wall 224 penetrating portion 225 reinforcing rib 226 stopper plate 227 locking portion 228 second screw hole 229 first screw hole 2291 threaded cone 2292 Third screw hole 2299

23 Back support of first variation 230 Bottom 231 Side wall 232 Front axial hole 233 Stopper 234 Hole 235 Rear axial hole 236 First bushing A1 First shaft rod A5 Fifth shaft rod D1 First rotation Axis D5 Fifth rotation axis

23 'second support back support 230' bottom 231 'side wall 232' front axial hole 234 'hole 235' rear axial hole 236 first bushing 237 'first leg 238' second leg Part A1 First shaft rod A5 Fifth shaft rod D1 First rotation shaft D5 Fifth rotation shaft

24 Back lever 240 of first variation 240 Sleeve member 241 Through hole 242 Arm 246 Fourth bushing A6 Sixth shaft rod D5 Fifth rotation shaft D6 Sixth rotation shaft

24 ′ Back lever of second variation 241 ′ Pin 242 ′ Arm 246 Fourth bushing A6 Sixth shaft rod A7 Seventh shaft rod D6 Sixth rotation shaft

25 gear unit 250 first case portion 2500 cylindrical projection 2501 center hole 2502 first axial hole 2503 second axial hole 2504 bearing recess 2507 screw hole 251 second case part 2512 first axial hole 2513 Second axial hole 2514 Collar 2515 Guide 2516 Long hole 2517 Screw hole 252 Drive element 2520 Shaft portion 2521 Inner polygon 2524 First bevel gear 253 Spindle screw 2534 Second bevel gear 2535 External screw 255 Second bush 2550 Bush head 256 3rd bush A8 8th shaft rod 254 Internal thread 2540 Threaded pin A8 9th shaft rod D2 2nd rotation shaft D8 8th rotation shaft D9 9th rotation shaft

26 Gas spring 260 Cylinder 261 Clamp part 262 Piston rod

27 Intermediate member 270 Blind hole 271 Fork-shaped segment 272 First axial pin 273 Second axial pin 274 Bolt 263 Connection D4 Fourth rotating shaft

28 Spring Unit 280 First Spring Guide 281 First Bearing Head 282 First Shaft 283 Pin 285 Second Spring Guide 286 Second Bearing Head 287 Second Shaft 288 Hole 289 Coil Spring D10 Tenth Rotating Shaft D11 Eleventh rotation axis

DESCRIPTION OF SYMBOLS 29 Bearing frame 290 Bottom 2900 Reinforcement rib 291 Side wall 2910 Penetration part 292 1st eye 2920 Pin-like protrusion 2921 Pin-like extension part 293 Bearing bracket 2930 Bearing recessed part 294 3rd eye 295 hole 297 2nd eye 298 hole 2970 Nose 299 Screw hole D4 4th rotation axis D6 6th rotation axis D9 9th rotation axis

30 Third lever 300 Rod 301 Support clamp 31 First lever 310 Rod 236 First bush 31 First lever 32 Second lever

40 Cushion plate 43 Stepped part 44 Threaded cone 48 hole

40 'Cushion plate 41' Slotted hole 42 'Screw hole 45' Fixed contour

46 Cushion 70 Cushion on 71 71 Rest support

Claims (7)

a) In order to adjust the inclination of the seat back (5), the inclination adjustment of the seat (4) is synchronized,
b) the mechanism (2) has its own fixed base part (20), through which a fixed first axis of rotation (D1) extends and can be tilted to this base part Seat support (22) is attached,
c) A front-side coupling means (21) is arranged between the base part (20) and the seat support (22), and this coupling means is a fixed third rotation axis ( D3) and a movable fourth rotating shaft (D4),
d) A coupling means (24, 24 ') on the back side is arranged, this coupling means being pivotally attached to a movable sixth rotating shaft (D6) on the one hand and another rotating shaft (movable on the other hand ( D5 and D7),
e) At least one first spring element (26) acting between the base part (20) and the seat support (22) is provided in the mechanism (2), which spring element is Pivotally attached to the rotating shaft (D4),
Chair, in particular rotatable, with gas spring (12) arranged vertically in the underframe (1), with a telescopic telescopic piston rod for adjusting the height of the seat (4) In the office chair, mechanism (2)
f) The first spring element (26), on the other hand, is pivotally attached to a movable eighth rotating shaft (D8), which is rotated by a gear unit (25) that can be operated from the outside by the user. A mechanism characterized in that the position can be changed. a) a gear unit (25) having a fixed second rotating shaft (D2) extending through the base portion (20), an eighth rotating shaft (D8), and a movable ninth rotating shaft ( D9)
b) At least in principle, at a rest position in which the seat (4) is horizontal and the seat back (5) is vertical, the second rotation axis (D2), the eighth rotation axis (D8), and the ninth rotation The axes (D9) are at least essentially perpendicular to each other;
c) In the relaxed position where the seat (4) is tilted to the maximum and the seat back (5) is complementary to the maximum, the eighth rotation axis (D8) is the third rotation axis (D3). ) Direction before the second rotation axis (D2) and the ninth rotation axis (D9) moves in the opposite direction after the second rotation axis (D2). The mechanism described in. a) the first spring element (26) is a gas spring (26) having a cylinder (260) and a telescopic telescopic piston rod (262);
b) The piston rod (262) extends to the maximum at the stationary position when the eighth rotating shaft (D8) is adjusted downward as much as possible, and the eighth rotating shaft (D8) is adjusted upward as much as possible. It is shrunk to the maximum at the relaxing position,
c) Mechanism according to claim 1 or 2, characterized in that the piston rod (262) is pivotally attached to the fourth axis of rotation (D4) by means of an intermediate member (27). a) Spring units (28) are positioned in pairs in the mechanism (2), these spring units being supported on the one hand in bearings (207) of the base part (20) and bearings on the other hand Supported in the bearing bracket (293) under the frame (29), the bearing frame (29) being mounted on both sides of the base portion (20);
The mechanism according to any one of claims 1 to 3, characterized in that the bearing frame (29) is made of synthetic resin and thereby constitutes a self-lubricating bearing location together with the metal parts to be mounted. . a) The front side coupling means (21) is formed as a plate-like lever, through which the third and fourth rotation shafts (D3, D4) extend,
b) The coupling means (24, 24 ') on the back side is composed of a sixth shaft rod (A6) and a sleeve member (240) coupled to this shaft rod via an arm (242), The shaft rod (A6) and the seventh shaft rod (A7) coupled to the shaft rod via the arm (242 ′), and the attached fifth, sixth through the shaft rod and the sleeve member. The mechanism according to any one of claims 1 to 4, characterized in that the seventh rotating shaft (D5, D6, D7) extends. a) In order to fix the seat back (5), the back support (23, 23 ') can be pivotally attached to the base part (20) at the first rotational axis (D1), or the base part (20 ) A pair of rungs (6) can be pivotally attached to the outside,
b) The bearing frame (29) includes a pin (2920, 2921) for insertion into the front lever (21) and the intermediate member (27), and a ninth shaft rod (A9) penetrating the gear unit (25). ) And a bearing portion (295, 298) for receiving the sixth shaft rod (A6). a) a locking element (218) operable by a user is arranged on the intermediate member (27) for selectively switchable locking of the gas spring (26);
7. A mechanism according to claim 1, wherein the locking element (218) acts on a valve stem guided in the piston rod (262) of the gas spring (26).

Images