JP5860513B2 - Chair - Google Patents

Description

  The present invention relates to a chair, and is particularly suitable for a rocking chair having a backrest that can be tilted backward.

  The rocking chair supports the back tilt of the backrest with elastic means such as a spring or rubber. Generally, the moment accompanying rocking acts on the elastic means as it is. The coil spring and gas spring are often used.

  However, this not only increases the cost of the elastic means, but also has a problem that the member for storing the elastic means (generally, a base provided at the upper end of the leg) is enlarged. On the other hand, Patent Document 1 discloses a mechanism that raises the seat in conjunction with locking, and if this mechanism is employed, the weight of the seated person acts to return the backrest even when locking. The force acting on the elastic body when locking is very small. Therefore, the elastic body can be downsized to contribute to cost reduction and downsizing of the base portion.

US Pat. No. 6,709,058

  In Patent Document 1, a rearward tilting of the backrest and an ascending / retreating movement of the backrest are linked by a link mechanism similar to the parallel link mechanism. That is, the front part of the seat and the base are connected to the front link in a side view forward tilted posture (precisely tilted forward with respect to the vertical line) with a pin, while the back frame and the seat to which the backrest is attached Are connected by a pin in a portion in front of the connecting portion of the back frame to the base, and the front portion of the back frame and the front link are similar to a parallel link mechanism. The front portion of the back frame and the front link are in a forward leaning posture even when the backrest is fully inclined backward.

  In this patent document 1, the connection between the front link, the base, and the seat, and the connection between the back frame and the seat are performed by inserting pins (shafts), respectively. Then, since the work of inserting a pin and attaching a retaining material such as a snap ring has to be performed, there is a problem that it takes time to assemble the chair and the productivity is poor.

The present invention has been made as a clue to such a situation, such as assembly viewed vertically of up, is to St. provide a more improved structure.

The invention of claim 1 first comprises a base provided at the upper end of the leg, a seat disposed above the base, and a backrest disposed on the rear side of the seat, the backrest being the has become configuration are found provided on linked back support device freely rear tilted base.

Further, the seat portion is connected to the front link portion connected to the base so as to be pivotable back and forth, and to the front link in a side view forward tilted position, directly or via an intermediate member to the back support device. A rear connection part, and the connection between the front connection part and the front link, and the connection between the rear connection part and the back support device, the seat part is substantially front-rear direction or substantially vertical direction or side view. It is an engagement method that fits by being moved relative to the tilt direction .

In this claim 1 , “relatively moving the seat part in a substantially front-rear direction or a substantially up-down direction or a side-view tilt direction” means that the seat part itself is moved in the front-rear direction or the like, and the seat part is substantially stationary. Including both moving other members. The connection to the back support device is generally performed by moving the seat part. However, the seat part and the front link may be connected to the front link by moving the seat part or by moving the front link. It may be connected to the seat part, or both may be moved and fitted together.

According to a second aspect of the present invention, in the first aspect , the front link and the front connecting portion can be fitted and removed when the front link is set to a substantially upright posture or a forward tilted posture, and can be detached from each other when the front link is set to a forward tilted posture. On the other hand, the rear connecting part and the back support device are fitted together by moving the seat part from the rear to the front while the engagement structure is disabled.

According to a third aspect of the present invention, in the first or second aspect , a groove-shaped female fitting portion extending in the left-right direction is formed on the front connecting portion, while the female fitting is formed on an upper end of the front link. Left and right laterally long bosses that fit into the joints are formed, and the front link bosses are formed with vertical and vertical engagement parts in a side sectional view, while the female fitting parts are formed at the lower ends. Is provided with an engaging protrusion that allows the engaging portion of the boss portion of the front link to be fitted when the engaging portion is in a vertically long posture in a side view and restricts the engaging portion from being detached when the engaging portion is inclined forward.

According to a fourth aspect of the present invention, in the second or third aspect , the seat portion is provided with a stopper that prevents relative movement between the rear connecting portion and the back support device .

In the first aspect of the invention , the front connecting portion and the rear connecting portion of the seat portion are connected to the front link and the back support device by moving the seat portion or moving the front link. Therefore, the efficiency of assembling the chair can be improved.

In the first aspect of the invention, the seat portion may be attached after the front link is connected to the base, or the front link may be attached to the base after the front link is first attached to the seat portion. .

In Claims 1 and 2, the connection structure between the front link and the seat portion can be variously embodied, but when adopting the fitting method of the left and right horizontally long boss portion and the female fitting portion as in Claim 3 , Since the connection state can be firmly held, there is an advantage that high connection strength can be secured even if the seat part and the front link are made of resin (if the seat part and the front link are made of resin, the form is excellent in aesthetics. This can be realized easily, and the generation of rubbing noise when locking can be eliminated.)

When the seat portion is composed of a seat body and a seat receiving body as in the embodiment , the seat body can be designed regardless of the connecting function, so that the seat body has a bending function to give a high cushioning property. This can be easily realized, and the seat body can be attached to the seat support body so that the front-rear position can be adjusted. In the embodiment, since the relative position between the rear engagement pin and the rear engagement claw is regulated by the stopper, it is ensured that the seat moves forward with the return rotation of the back support device. In this case, it is preferable to employ a method in which the stopper is inserted into the seat receiving body as in the embodiment because the stopper can be surely prevented from falling off.

(A) is a fragmentary perspective view of the chair which concerns on embodiment, (B) is a side view. FIG. FIG. It is the separation figure seen from the lower part. FIG. (A) is a partially separated perspective view of the elasticity adjusting mechanism, (B) is a separated perspective view for showing the mounting structure of the back frame. It is a sectional side view. (A) is a separated rear view of the main part, (B) is a partial perspective view of the seat receiving body. FIG. (A) is a perspective view of an upper cover, (B) is a separated perspective view of an upper cover and a base. It is the perspective view which looked at the circumference of a rear connection part from the lower part. It is a figure for demonstrating the mounting aspect of a stopper, (A) is an isolation | separation perspective view, (B) is an isolation | separation top view. It is a figure for demonstrating the mounting aspect of a stopper, (A) is the isolation | separation perspective view in the fracture | ruptured state, (B) is a sectional side view. (A) is the elements on larger scale of Drawing 7, (B) is a perspective view in the state where the front link was turned over. (A) (B) is a fractured perspective view of a front link. (A) is sectional drawing for showing fitting of a front link and a seat receiving body, (B) is a sectional view in the state where a front link and a seat receiving body were fitted together. (A) is a separated perspective view of a front link and a seat receiving body, and (B) is a separated perspective view of a front link and a base.

Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to a swivel chair used for office work or the like. In the following description and claims, the use of the word "longitudinal", "lateral" to identify the direction, is defined as the front direction toward the person who is seated in a normal posture chair child. Front view is a state viewed from the occupant and opposite the direction.

(1). Overview of the chair As shown in FIG. 1, the chair is composed of a leg device displaying only the leg strut (gas cylinder) 1, a base 2 fixed to the upper end of the leg strut 1, and a seat disposed above the base 2. It has a body 3 and a backrest 4 on which a seated person can rest. An armrest device can be attached to the base 2 as an optional item.

As can be understood from FIG. 2, the seat body 3 has a seat plate (seat inner shell) 5 made of a synthetic resin and a cushion material 6 disposed on the upper surface thereof. The skin material is stretched. Further, the seat plate 5 is attached movably adjusted back and forth in the synthetic resin seat receiving body (the seat outer shell) 7. Therefore, in the present embodiment, the seat portion 8 is configured by the seat body 3 and the seat receiver 7.

As shown in FIG. 2, the backrest 4 is provided with a back frame 10 made of a synthetic resin, and a back plate 11 made of synthetic resin fixed to the front face. Back plate 11 is adapted to form horizontal stripes of the elongated holes vacated in multiple stages, this skin material 12 such as a mesh (see FIG. 1) is stretched. A cushion material may be disposed on the front surface of the back plate 11. In this case, the cushion material is covered with a bag-shaped skin material. The back frame 10 has a vertically long left and right side frame 13, an upper frame 14 that connects the upper ends thereof, and a lower frame 15 that connects the lower ends of the left and right side frames 13. A back plate 11 is fixed to the base plate.

The back frame 10 has left and right forward arm portions 16 extending in series from the side frame 13, and a joint portion 17 having an upper plate 17a and left and right side plates 17b is integrally connected to the left and right forward arm portions 16. Yes. A rocking member 18 made of a metal plate is connected to the rear part of the base 2 so as to be tiltable by a left and right longitudinal first shaft 19, and the joint portion 17 of the back frame 10 is fixed to the rocking member 18 with screws. Tei Ru.

In this embodiment, the swing support member 18 , the forward arm portion 16 of the back frame 10 , and the joint portion 17 constitute the back support device described in the claims, and the backrest 4 is centered on the first shaft 19. Tilt. Since the left and right forward arm portions 16 of the back frame 10 are integrally connected by the joint portion 17, the rigidity of the left and right forward arm portions 18 is remarkably high.

For example, as shown in FIG. 3, the swing member 18 is integrally provided with a support arm 18a extending forward and upward in a side-view tilt posture, and an example of a rear engagement portion is provided at the tip of the left and right support arms 18a. The rear engaging pin 20 is inserted. For example, as shown in FIG. 5 and FIG. 8 (B), the lower surface of the seat receiving body 7, a pair of left and right rear engaging claws 21 that caught fitted from behind the rear engagement pin 20 is integrally molded Yes. For this reason, when the backrest 4 tilts backward , the seat support 7 and the seat 3 are pulled backward.

On the other hand, as can be understood from FIG. 5, for example, the base 2 is made of a metal plate and has a box-like shape with an upward opening having left and right side plates 2a. 22 attached to the second shaft 22 rotatably connected to the front link 23 in a single structure, and the upper end of the front link 23, female fitting portion 24 twice formed the seat receiving body 7 It is inserted in a movable manner. Accordingly, when the seated person leans on the backrest 4, the seat receiving body 7 is pulled backward by the swing member 18, and accordingly , the front link rotates and the seat portion 8 moves upward while moving upward.

  As shown in FIG. 5 and FIG. 10A, the upper cover 25 is attached to the base 2 from above, and the rear engagement pin 20 is supported by the upper cover 25. The base 2 is covered with a lower cover 26 from below. A control unit 29 having a rotary lever device 27 and a back cover 28 is disposed at the rear of the base 2. The control unit 29 switches the resistance against locking and switches between a lockable state and a lockable state.

(2) Relationship between the base 2, the swinging member 18 and the back frame 10 Hereinafter, details of each part will be described. First, the relationship among the base 2, the swing member 18, and the back frame 10 will be described. As already mentioned, the base 2 is in the form of upwardly open box-shaped, for example, as shown in FIGS. 5 and 7, the substantially central portion of which the inside of the base 2, the shaped side section downwardly opening U The first inner bracket 31 is welded, and a bush 32 is fixed to the first inner bracket 31 and the bottom plate of the base 2, and the leg support 1 is fitted to the bush 32 from below.

The first inner bracket 31 is secured the second inner bracket 33 of the upwardly opening U-shape, the space surrounded by both the inner brackets 31 and 33, the base end portion of the armrest device is inserted laterally It is like that. As shown in FIG. 5, the side plate 2 a of the base 2 has a hole for inserting the base end of the armrest device, and the left and right ends of the second inner bracket 33 are exposed to the outside of the base 2. A downward piece 33a is formed at the tip of the lever, and a base end portion of the armrest device is fastened to the downward piece 33a with a screw.

As shown in FIG. 5, the side plate of the lower cover 26 has a hole 34 into which the base end portion of the armrest device is fitted, and this hole 34 is closed by a removable cover plate 35. Further, a holding groove hole 36 for holding the second shaft 22 is formed in the front portion of the side plate 26 a in the lower cover 26. Kyojimizoana 36 is then constricted to its upper end, a lower cover 26 for this purpose fitted in the second shaft 22 by deforming against the elastic.

For example, as shown in FIG. 5, the swing member 18 is a basic form having an upper plate and left and right side plates 18b. The left and right side plates 18b surround the base 2 from the outside, and the left and right side plates 2a of the base 2 and the left and right side plates of the swing member 18 are enclosed. The first shaft 19 passes through 18b. The first shaft 19 is attached to the base 2 via a bush. The support arm 18a of the swing member 18 extends from the side plate 18b.

A left and right long third shaft 37 is inserted in the rear part of the left and right side plates of the swing member 18. On the other hand, as shown in FIG. 4, and forward arm portion 16 of the back frame 10 is made thicker shape having a certain lateral width, the tip of the left and right forward arm portion 16 is fitted into the first shaft 19 A forward opening groove 38 is formed, and further, a downward opening groove 39 that fits from the top to the tip of the third shaft 37 is formed at a position behind the forward opening groove 38.

Both the opening grooves 38 and 39 are not opened on the left and right outer sides, and therefore the first shaft 19 and the second shaft 22 are held by the forward arm portion 16 so as not to be left and right. For this reason, the first shaft 19 and the second shaft 22 do not need a retaining means such as a snap ring.

  As can be easily understood from FIG. 6B, the joint portion 17 of the back frame 10 overlaps the swing member 18 from above, and further, a resin-made pressing member 41 overlaps the lower surface of the swing member 18. ing. The three members are fastened together by screwing the screws 40 penetrating the upper surface plate 17a of the joint portion 17 and the upper surface plate of the swing member 18 into the pressing member 41. As a result, the back frame 10 and the swing member 18 rotate together.

As shown in FIG. 6 (A), between the pressing member 41 and the base 2, a pair of left and right fixed rubber 44 are interposed as an example of the elastic body, a fixed rubber 44, the base 2 The receiving member 45 is attached. Even in the non-sitting state, the fixed rubber 44 is compressed by the pressing member 41. In other words, the fixed rubber 44 is pretensioned.

As described above (see FIG. 3), the control unit 29 includes the rotary lever device 27 and the back cover 28 to which the rotary lever device 27 is attached. The back cover 28 has left and right side plates 28 a, and sandwiching portions 28 b for attaching the back cover 28 to the third shaft 37 are opened forward on the left and right side plates 28 a. As shown in FIG. 5, the back cover 28 has a flange portion 28 c that overlaps the rear upper surface of the swing member 18, and the flange portion 28 c is fixed to the swing member 18 with a screw (not shown ).

As shown in FIGS. 3 and 6, the rotary lever device 27 has a central shaft 46 and an outer cylinder 47. The central shaft 46 is for adjusting the hardness of locking, and one end portion thereof protrudes outside the outer cylinder 47, and a strength adjusting lever 48 is provided here. On the other hand, the outer cylinder 47 is for switching between a lockable state and a lockable state, and a lock lever 49 is provided at one end thereof.

For example, as shown in FIG. 6, the side plate 18 b of the swing member 18 is provided with a relief groove 50 in which the rotary lever device 27 is fitted and opened rearward. As shown in FIG. 3 , the outer cylinder 47 of the rotary lever device 27 is provided with a lock body 51 protruding downward. When the outer cylinder 47 is rotated by putting a finger on the lock lever 49, the lock body 51 is Switching between a locked posture that abuts on the rear end edge of the base 2 so as to hardly lock and a free posture that does not hit the rear end edge of the base 2 even if locked. It is also possible to restrict the locking angle with the lock body 51.

On the other hand, as shown in FIG. 6A, a slider 52 that moves in the axial direction when the central shaft 46 is rotated is attached to the central shaft 46. A movable rubber 50a is attached to the slider 52, and the slider When 52 is moved left and right, the strong state in which the movable rubber 53 is supported by the base 2 via the step 45a of the receiving member 45 and the weak state in which the movable rubber 53 is not supported by the receiving member 45 (freely rotates). cut to the state has become Let 's Waru conversion. That is, when the movable rubber 53 acts or does not act as a resistance at the time of locking, the hardness of the locking is switched between two levels.

(2) Relationship between the seat receiver 7, the upper cover 25, and the swing member 18 Next, the relationship between the seat receiver 7, the upper cover 25, and the swing member 18 will be described. As already described with reference to FIG. 2, the seat portion 8 includes the seat body 3 and the seat support body 7. A large number of slits are formed in the seat plate 5 so as to bend (sink) when seated. For example, as can be seen from Figure 2, the seat plate 5 is curved loosely in an upward concave shape in front view, the tip portion is bent in a large curve downward, the rear portion is warped come upward bent rather loose . On the other hand, the seat support 7 is also basically gently curved upwardly concave in a front view, but has a number of ribs extending vertically and horizontally to ensure strength.

Since the relationship with the present invention is thin, the details are omitted, but the seat plate 5 is mounted on the seat receiver 7 so as to slide back and forth by a certain size, and a lever (on the right side of the seat receiver 7 ( When the lever is pulled, the slidable free state is established, and when the lever is returned by the spring, the non-slidable locked state is established. Figure 12 guide claws 54 of two pairs on the left and right sides of the seat receiving body 7 protrudes upward in, these four guide claws 54, fit so as not to escape upward in the elongated groove formed in the seat plate 5 Thus, the seat body 3 is held so as to be slidable back and forth.

  As described with reference to FIG. 5 and FIG. 8B, a pair of left and right rear engagement members, which are front-facing hook-like shapes as viewed from the side, are provided on the lower surface of the rear portion of the seat receiver 7 as an example of the rear connection portion. The claw 21 is provided integrally. Side protrusions 55 are provided on the left and right outer sides of the rear engagement claws 21 so as to protrude downward. The side protrusions 55 serve as stoppers, so that the rear engagement pins 20 are held so as not to be disengaged in any of the left and right directions. ing. Therefore, it is not necessary to provide a retaining means such as a snap ring on the rear engagement pin 20, and as a result, the processing cost and the assembly cost can be reduced.

For example, as can be understood from FIG. 1B, the left and right side protruding walls 55 of the seat support 7 cover the tip of the support arm 18a of the swing member 18 from the left and right outer sides. Further, as shown in FIGS. 5 and 8B, a front projecting wall 56 is integrally continuous with the left and right side projecting walls 55. Therefore, the left and right rear engaging claws 21 are surrounded on three sides by the side protruding wall 55 and the front projecting walls 56. For this reason, even if a person inserts a fingertip below the seat receiving body 7, the rear engagement pin 20 and the rear engagement claw 21 are not touched, and safety is ensured.

When locking, but the rear engagement claw 21 in the rear engagement pin 20 is pulled back, it must be pressed before the seat receiving body 7 in the rear engagement pin 20 at the time of locking of return. Therefore, for example, as shown in FIGS. 11 to 13, a stopper 57 for holding the rear engagement pin 20 so as not to be relatively movable back and forth is attached to the seat receiver 7. The stopper has a substantially T-shape when viewed from the side, and has a hook-like locking piece 57a projecting forward at the lower end. The locking piece 57a has a lateral width larger than that of the main body, and a recess 57b that opens forward is formed on the left and right outer portions so that a fingertip or the like can be hooked. Further, the distal end surface of the locking piece 57a is inclined in a slightly forward inclined posture with respect to the vertical line in a side view.

  As shown in FIGS. 12 and 13, the seat receiving body 7 is formed with a storage hole 60 into which the stopper 57 is inserted and attached from above. The storage hole 60 is substantially L-shaped in plan view in accordance with the plan view form of the stopper 57, and forms a support portion 61 that receives the upper portion of the stopper 57 and holds it so that it cannot fall. Then, as clearly shown in FIG. 11, stopper receiving portions 62, which are engaged with the locking pieces 57 a of the stopper 57 from below, are projected downward on the left and right sides of the front protruding wall 56 of the seat receiving body 7. ing.

When the stopper 57 is inserted into the storage hole 60, the locking piece 57a is once elastically deformed. When the stopper 57 is completely inserted, the locking piece 57a returns to its original state and is engaged with the stopper receiving portion 62 from below. This ensures that the stopper 57 is held so as not to come out. Since the stopper 57 is located on the front side of the rear engagement pin 20, when the rear engagement pin 20 moves forward due to the return of locking, the stopper 57 is pushed by the rear engagement pin 20, so that the seat receiver 7 is Move forward. That is, the rear engagement pin 20 and the seat receiving member 7 is longitudinal relative movement impossible retained.

Since the stopper 57 is engaged with the seat receiving body 7 by the locking piece 57a, the restriction function of the rear engagement pin 20 is not hindered. Further, since the stopper 57 cannot be removed unless the seat plate 5 is removed, the stopper 57 will not come out even if, for example, a seated person puts a fingertip on the locking piece 57a. The stopper 57 can be easily removed by removing the seat plate 5 and then bending the locking piece 57a backward to release the engagement with the stopper receiving portion 62. Therefore, for example, the rear engagement pin 20 can be easily replaced.

As in the present embodiment, by adopting a configuration to engage them to form a stepped portion 57b in the stopper receiving portion 62 to the locking piece 57a of the stopper 57, the advantage of accurately prevent the stopper 57 is displaced in the lateral direction There is.

5 and as mentioned with reference to FIG. 10 (A), the rear engagement pin 20 is supported by the upper cover 25 made of synthetic resin. Next, the upper cover 25 will be described. For example, as shown in FIG. 10 (A), the upper cover 25, a pair of right and left pin receiving portion 64 for receiving the rear engagement pin 20 is formed. The pin receiving portion 64 is recessed in an upward concave shape so as to receive the rear engagement pin 20 in a wide area. In addition, the left and right inner sides of the pin receiving portion 64 are recesses 65, which are for releasing the rear engaging claws 21.

The upper cover 25 is integrated with the upward side wall portion 66 surrounding the pin receiving portion 64 from the left and right, the upward front wall portion 67 integrally connected to the front end of the left and right upward side wall portion 66, and the rear end of the left and right upward side wall portion 66. And an upward rear wall portion 68 that is continuous with the projection. As shown in FIG. 7, the front projecting wall 56 of the seat receiver 7 is disposed in the vicinity of the front side of the upward front wall portion 67 of the upper cover 25. For this reason, even if a person inserts a fingertip between the seat receiving body 7 and the upper cover 25, there is no possibility that the finger is pinched between the rear engagement pin 20 and the front protruding wall 56.

Furthermore, for example, as shown in FIG. 10 (A), the inner end of the upward rear wall portion 68 of the upper cover 25 is provided an upward inner wall portion 69 which protrudes toward the upward front wall 67. Therefore, even if a person tries to apply the fingertip from the rear to the rear engagement pin 20 or the rear engagement claw 21, the finger cannot be applied by being guarded by the upward rear wall portion 68 and the upward inner wall portion 69. Safety is ensured.

The upper cover 25 has left and right side plates 25a. As can be understood from FIG. 5, the left and right side edges of the upper cover 25 and the left and right side edges of the lower cover 26 are set to overlap. In other words, the left and right side surfaces of the upper cover 25 and the left and right side surfaces of the lower cover 26 are set to be substantially the same surface. Therefore, for example, as shown in FIG. 10 (A), a thin-walled downward positioning piece 70 is provided at two portions of the upper cover 25 at the front end portion and the rear end portion of the left and right side plates 25a. 70 is fitted in a positioning groove (not shown) formed in the upper end surface of the side plate 26a in the lower cover 26.

  As shown in FIG. 10B, the upper cover 25 has a pair of left and right front engaging claws 71 and a pair of left and right rear engaging claws 72 projecting downward. The front engagement claw 71 has a saddle shape facing backward in a side view, and the rear engagement claw 72 has a saddle shape facing forward in a side view.

  On the other hand, a pair of left and right inward flanges 2 b are formed on the base 2, and the front engaging claw 71 of the upper cover 25 is hooked on the front end edge of the inward flange 2 b in the base 2. The first inner bracket 31 provided on the base 2 is formed by bending a pair of left and right upright pieces 31a to support the upper cover 25 at the upper horizontal portion of the upright piece 31a, and the rear engaging claws of the upper cover 25. 72 is engaged with the rear edge of the upright piece 33a.

  The upper cover 25 is formed with a U-shaped groove 73 that opens rearward in a plan view. This is to avoid interference with the rod 74 (see FIG. 7) that presses the push valve of the leg column 1. belongs to. The rod 74 is operated by, for example, an elevating operation lever 75 shown in FIGS. That is, when the lifting operation lever 75 is raised upward, the lock of the leg support 1 is released.

(3) Relationship between the front link 23 and the base 2 Next, a connection structure between the front link 23 and the base 2 will be described. The front link 23 is a molded product of a synthetic resin, and roughly has a plate-like appearance by combining a large number of plate-like ribs. For example, as shown in FIG. 17B, the lower end portion of the front link 23 has an inner bearing groove 78 that fits into the second shaft 22 inside the base 2 as an example of the lower connecting portion, A side bearing groove 79 that fits into the second shaft 22 is provided on the outside.

A slit groove 80 is formed between the inner bearing groove 78 and the side bearing groove 79 so as not to contact the side plate 2 a of the base 2. The left and right side bearing groove portions 79 have an outer wall 79a and are formed in a bag shape, and the second shaft 22 is held by the outer wall 79a so that the left and right sides cannot be removed.

As shown in FIG. 17B, both bearing groove portions 78 and 79 have a U-shaped cross section so as to be fitted to and detached from the second shaft 22, and a pair of left and right bearing bushes 81 are attached to the inner bearing groove portion 78. . The bearing bush 81 is made of a resin having a small friction coefficient and high wear resistance. As clearly shown in FIGS. 14 (A) and 17, an engagement claw 82 is formed at the opening edge of the bearing bush 81. The engaging claw 82 is fitted into the engaging hole 83 formed in the inner bearing groove 78 against elasticity. Therefore, the left and right bearing bushes 81 function as bearings in the front link 23, and other portions are not in contact with the second shaft 22. Since the inner bearing groove 78 is elongated in the left-right, and has a high rigidity.

  Since the bearing bush 81 is U-shaped in a side view, it can be mounted on the second shaft 22 with one touch by fitting from above. As shown in FIG. 14, the front end of the base 2 is a front wall 2 c that is gently curved in a front-facing convex shape in a side sectional view, while the back of the inner bearing groove 78 in the front link 23 is A plurality of regulating ribs 84 are formed in the vicinity of the second front wall 2c. The regulating ribs 84 prevent the front link 23 from coming out of the second shaft 22 in a forward inclined posture.

In addition, it is assumed that the seat holder 7 is grasped by hand and the chair is lifted. In this case, the front link 23 must be in a substantially vertical posture in order for the front link 23 to come out of the second shaft 22. Since the limit of the backward movement of the body 7 is determined , the front link 23 does not rotate to a posture close to the vertical posture, and therefore the front link 23 does not come out of the second shaft 22.

(3). Relationship between the front link 23 and the seat support 7 Next, a connection structure between the front link 23 and the seat support 7 will be described. For example, as shown in FIG. 17 (A), a female fitting portion 24 that protrudes downward from the left and right horizontally is provided as an example of the front connecting portion at the front portion of the seat support 7 so as to protrude downward. On the other hand, as an example of the upper connecting portion, a boss portion 86 that fits into the female fitting portion 24 of the seat receiver 7 is integrally provided at the upper end portion of the front link 23.

Female fitting portion 24 has its left and right side portions has become the bearing portion 87 of the cross-section U-shaped, between the left and right bearing portions 87 penetrates vertically. A front restricting piece 88 extending in the left-right direction between the left and right bearing portions 87 is formed in the front portion 24a of the female fitting portion 24 so as to protrude into the groove. On the other hand, the rear portion 24b of the female fitting portion 24 has a side-view hook-shaped engagement claw 89 facing the inside of the groove at the left and right intermediate portions, and between the engagement claw 89 and the left and right bearing portions 87. A pair of left and right rear restricting pieces 90 positioned and facing the groove are formed.

On the other hand, as shown in FIG. 15, the boss part 86 of the front link 23 basically has a form close to a prism, and the left and right side parts thereof are in surface contact with the left and right bearing parts 87 of the seat support 7. An arcuate portion 91 is formed. The boss portion 86 is in a state of being supported at both ends supported by the left and right side plates 23a, and the front cover portion 92 has a boss portion at a position positioned in front of the boss portion 86 with the front link 23 in a substantially vertical posture. part 86 is formed at an interval of certain degree of, in addition, the site located below the boss portion 86 in a state that the front link 23 and a substantially vertical posture, the intermediate bottom plate 93 is formed.

There is a space between the front cover portion 92 and the intermediate bottom plate 93 and the boss portion 86, so that the boss portion 86 is fitted into the female fitting portion 24, and the front link 23 causes the boss portion 86 to be fitted. It is allowed to rotate about the center. The left and right side plates 23a of the front link 23 are located on the left and right outer sides of the female fitting portion 24. Therefore , the front link 23 is held so as not to move left and right. In addition, a pair of reinforcing ribs 94 are integrally connected to the boss portion 86 with the left and right intermediate portions therebetween. The reinforcing rib 94 is connected to the front cover portion 92 and the intermediate bottom plate 93.

As described above, the boss portion 86 basically has a prismatic shape. However, as can be easily understood from FIG. 16, the front link 23 is substantially omitted from the portion excluding the left and right bearing portions 87. In the state of being in a vertical posture, the cross section is substantially rectangular in a side view, and the lateral width W is set to be approximately the same as the distance E between the front and rear regulating pieces 88 and 90 in the female fitting portion 24. Te vertical length L is set to be longer dimension than the spacing dimension E between before and after the restriction piece 88, 89 in the female fitting part 24.

For this reason, when the front link 23 is in a posture substantially orthogonal to the seat receiving body 7 in a side view, the boss portion 86 can be easily inserted into the female fitting portion 24 and is tilted greatly forward. In the state of use, even if it tries to raise the seat receiving body 7 upward, it does not come out of the female fitting part 24. Insertion of the boss portion 86 of the female fitting part 24 is performed by the engagement claw 89 is elastically deformed.

  Therefore, when the front link 23 is attached to the seat receiver 7 in advance before assembling the chair, the front link 23 will not fall out even if the front link 23 is rubbed from the seat receiver 7. As shown in FIG. 15, the boss portion 86 has a large number of slots 95 opened in a direction orthogonal to the axis thereof. This is a measure to prevent this.

(4) Summary In the above configuration, chair assembly is generally performed in the following procedure. That is,
1). Fix the base 2 to the leg support,
2). The second shaft 22 and the upper cover 25 are attached to the base 2, the swing member 18 is connected to the base 2 with the first shaft 19, and the control unit 29 is fitted from behind.
3). The back frame 10 is attached in such a procedure that the forward opening groove 38 is first inserted into the third shaft 37 from behind and then the downward opening groove 39 is fitted into the third shaft 37.
Four). The rubber is compressed by tilting the back frame 10 backward. In this state, the rear engagement pin 20 is inserted into the support arm 18a of the swing member 18, and then the back frame 10 is returned to cover the rear engagement pin 20 with the upper cover. (In this state, the rubber is slightly compressed, so that the rear engagement pin 20 is in strong contact with the pin receiving portion 64 and pre-tensioning is applied when locking.) ,
Five). The front link 23 in advance connected to the seat receiving member 7, and, by the front link 23 in a substantially vertical posture, the mating of the female fitting part 24 of the boss 86 and the seat receiving body 7 conducted, then, it brought into engagement hook from behind the rear engaging pawl 21 on the rear engagement pin 20,
6). Attach the stopper 57, and then attach the seat 3 to the seat receiver 7.
It is assembled in the procedure. The attachment of the backrest 4 may be performed before or after the seat body 3 is attached. The front link 23, may have been attached to the seat receiving body 7 earlier. After assembly, the front link 23 assumes a forward tilted posture, and as described above, the front link 23 is held so as not to be detached by the action of the regulating rib 84.

Then, the mounting of the front link 23 to the seat receiving body 7, the mounting of the front link 23 to the base 2, and the mounting of the seat receiving body 7 to the rear engagement pin 20 (the swinging member 18), every time the insertion of the pin Since the front link 23 and the seat support 7 can be moved in a direction perpendicular to the axis of each of the shafts 19, 22, and 37 without any work, the efficiency of assembling the chair can be significantly improved. .

Now, since the rear engaging claws 21, it is also possible to mate the rear engagement pin 20 by deformation of against its elasticity, this is shall be fitted with a strong force, the operator There is a problem that imposes a burden on On the other hand, when the configuration in which the rear engagement pin 20 is prevented from coming out of the rear engagement claw 21 by the stopper 57 as in the present embodiment, the rear engagement pin 20 and the rear engagement claw 21 are even when the suit fits with play, for reliably holding the fits suits state, an advantage that can be rigidly connected while ensuring the ease of assembly work.

  The shape of the stopper 70 may not be a plate shape as in the embodiment, and may be a flat plate shape, a rod shape, a block shape, or the like. Bolts or headed pins can also be used.

This embodiment has the various advantages. First, the back frame 10 is attached by the procedure of inserting the forward opening groove 38 into the third shaft 37 from behind and then fitting the downward opening groove 39 into the third shaft 37. Is easy to do.

Further, when the rear engagement pin 20 is attached after pre-tensioning the rubber, the rear engagement pin 20 is kept pressed against the upper cover 25 by the elasticity of the rubber. even without holding human hand, it is wherein such Ino to leave or or displacement movement, Thus, in going assembled while flowing semi-finished product in the line, enable easy mounting of the seat receiving body 7 . Further, since the upper cover 25 is held by the rear engagement pin 20 so as not to be detached, the cover function of the upper cover 25 is ensured.

In the present invention, the front link 23 rotates and the seat support 7 moves back and forth while moving up and down, but consideration is given so that fingers do not get caught even if a person touches the moving member. That is, first, as can be understood from FIG. 1B, for example, a large vertical dimension (several numbers) is present between the base 2 and the front link 23 and the seat receiver 7 even when the seat receiver 7 is fully lowered. 10 mm) of space S1 is vacant, so that the finger is not sandwiched between the seat receiver 7 and the base 2 or the front link 23.

Next, as can be understood from FIG. 7, the gap S2 between the front end of the front link 23 and the front lower end of the female fitting portion 24 is only a few millimeters. There is nothing. Further, even if a finger is inserted into the position between the front end portion of the front link 23 and the rear surface of the female fitting portion 24, it is guarded by the reinforcing rib 94, and the intermediate bottom plate 93 of the front link 23 and the female fitting portion 24 are Since there is 20 mm or more in the space S3 between them, even if a finger is inserted here, it is not pinched. Further, as shown in FIG. 7, the gap S4 between the front end of the lower cover 26 and the intermediate bottom plate 93 of the front link 23 has a dimension (20 mm or more) with a margin even when a human finger is inserted. Because there is no finger in here.

(6). Others The present invention can be embodied in various ways other than the above embodiment. The front link may be separated into a plurality of left and right parts . Connecting the off Rontorinku and base to form the boss portion in the front link, which is also possible to fit the female fitting portion provided on the base, further, the front link and the seat receiving member As the connecting means, a female fitting portion may be formed on the front link and a boss portion may be formed on the seat receiving body.

In the present embodiment, the back support device is configured by the swing member and the back frame. However, the forward arm portion of the back frame and the swing member in the embodiment may be integrated, or The back frame in which the frame of the backrest and the back column are integrally formed can be used as the back support device as it is .

  Further, the seat support and the base may be connected by a rear link, and the back support device may be connected to the rear link. That is, the seat receiver may be connected to the back support device via some intermediate member. Further, the back support device and the seat support body may be connected by connecting the seat support body to the base by the front link and the rear link so as to be movable up and down and back and forth.

The chair to be applied is not limited to a swivel chair, and can be applied to a non-lifting chair such as a conference chair or a fixed chair such as a theater chair. It is also possible to integrally provide a connecting part such as a female fitting part or a rear engaging claw on the seat plate. Furthermore, the present invention can also be applied to a chair whose backrest does not rock or a chair that does not have a backrest.

The present invention is embodied in a chair and exhibits its usefulness. Therefore, it can be used industrially.

1 Leg support (gas cylinder)
DESCRIPTION OF SYMBOLS 2 Base 3 Seat body 4 Backrest 5 Seat plate 7 Seat receiving body 8 Seat part 10 Back frame 16 Forward arm part which comprises a part of back support apparatus 18 Swing member which comprises a part of back support apparatus 19 Tilt of a backrest First shaft as a fulcrum 20 Rear engagement pin 21 Rear engagement claw as an example of a rear connection portion 22 Second shaft 23 Front link 24 Female fitting portion as an example of a front connection portion 25 Upper cover 56 Stopper 64 Above Cover pin receiving part 86 Front link boss part

Claims (5)

A base provided on an upper end of the leg; a seat disposed above the base; and a backrest disposed on the rear side of the seat; the backrest is connected to the base so as to be tilted rearward. A configuration provided in the back support device,
The seat part is connected to the front link part connected to the base so as to be pivotable back and forth, and is connected to the back support device directly or via an intermediate member. A connecting portion, and the connection between the front connecting portion and the front link, and the connection between the rear connecting portion and the back support device, the seat portion is substantially in the front-rear direction, substantially in the up-down direction, or in the side view tilt direction. It is an engagement method that fits by moving relative to
Chair. While the front link and the front connecting portion have an engagement structure that is detachable when the front link is set to a substantially upright posture or forward tilted posture and cannot be detached from each other when the front link is set to a forward tilted posture, The rear connecting part and the back support device are adapted to fit together by moving the seat part from the back to the front.
The chair according to claim 1. The front coupling part is formed with a groove-shaped female fitting part extending in the left-right direction, while the front link is formed with a left and right laterally long boss part that fits into the female fitting part. The front link boss portion is formed with a vertically long engagement portion in a side sectional view, while the lower end portion of the female fitting portion has a boss engagement portion on the front link side surface. Engaging protrusions are provided that allow insertion when the posture is vertically long as viewed and restrict the engagement portion so that it cannot be removed when the engaging portion is in a forward inclined posture.
The chair according to claim 1 or 2. The seat portion is provided with a stopper that prevents relative movement between the rear connecting portion and the back support device.
The chair according to claim 2 or 3. A base provided on the upper end of the leg, and a seat disposed above the base, the seat is connected to the base via a front link and a rear link so as to be movable back and forth; For this reason, the seat portion has a front connecting portion connected to the front link and a rear connecting portion connected to the rear link,
The connection between the front connecting part and the front link and the connection between the rear connecting part and the rear link are engaged with each other by being relatively moved in a substantially front-rear direction, a substantially vertical direction, or a side-view tilt direction. In the use state of the seat, the seat is held so as not to be removed from the front link and the rear link.
Chair.

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