JP2014210206A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a form for improving assembling efficiency concerning a chair where a seat part is moved backward while being lifted up when the chair is rocked.SOLUTION: The front part of a seat reception body 7 and a base 2 are connected via a front link 23 and the rear part of the seat reception body 7 is connected to a rocking member 18. A back frame 10 is fixed to the rocking member 18 and the back frame 10 includes a backrest 4. The front link 23 is fitted into the base 2 from above and the front link 23 is fitted into the seat reception body 7 from beneath. A rear engagement pawl is formed in the rear part of the seat reception body 7 so as to be fitted to a rear engagement pin 20 from behind. Since a work to insert the pin is not required when the seat reception body 7 is attached, a chair assembling work is efficiently performed.

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 in light of such a current situation, and is intended to provide an improved structure such as an improvement in assemblability in a chair in which a seat is lifted when rocking.

  The present invention provides a chair having a base provided at the upper end of a leg as a first member and a seat disposed above the base, wherein the seat is connected to the base via a link. 1 connection part and the 2nd connection part connected with the 2nd member attached to the said base, The connection of the said 1st connection part and a link, or the connection of a 2nd connection part and a 2nd member At least one of them is an engagement method that fits by moving the seat part in a direction orthogonal to the rotational axis of the link.

  The present invention can be developed in various ways. Examples thereof are shown in claims 2-6. Of these, the invention of claim 2 comprises, in claim 1, firstly, 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 is provided in a back support device that is connected to the base so as to be able to tilt backward, and when the backrest tilts backward against the elastic means, the seat portion is raised and retracted. Yes.

  Further, the seat portion includes a front connection portion connected to the front link that is connected to the base so as to be pivotable back and forth, and that is tilted forward in a side view, and a rear connection portion connected to the back support device. The connection between the front connecting portion and the front link and the connection between the rear connecting portion and the back support device are performed by relatively moving the seat portion in a substantially front-rear direction, a substantially vertical direction, or a side-view tilt direction. Therefore, the front connecting portion becomes the first connecting portion, the rear connecting portion becomes the second connecting portion, and the back support device becomes the second member. It has become.

  In this claim 2, “relatively moving the seat part in a substantially front-rear direction or a substantially vertical 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 third aspect of the present invention, in the second aspect, the front link and the front connecting portion are detachable when the front link is set to a substantially upright posture or a forward tilted posture, and are removed from each other when the front link is set to a forward tilted posture. One of the rear connecting part and the rear support part is a horizontally long rear engaging pin and the other is fitted to the rear engaging pin. These rear engagement pins and rear engagement claws are fitted together by moving the seat portion from the rear to the front.

  According to a fourth aspect of the present invention, in the second or third aspect, a groove-shaped female fitting portion extending in the left-right direction is formed in the front connecting portion, while the female fitting is formed at 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 fifth aspect of the present invention, in the third or fourth aspect, the seat includes a seat that receives a load of a seated person, and a seat receiver that supports the seat from below. A front connecting portion and a rear engaging claw are formed on the receiver, and the rear engaging claw and the rear engaging pin are moved forward and backward by hitting the seat receiving body from the rear side. A stopper for preventing relative movement is provided. According to a sixth aspect of the present invention, in the fifth aspect, the stopper is inserted and attached to the seat receiving body from above.

  In the present invention, in assembling the seat portion, either one or both of the first connecting portion and the second connecting portion may move the seat portion or move the link to connect the connecting portion to the link or the second member. By fitting in the joint portion, it is connected to the front link or the second member, so that it is possible to eliminate or reduce the trouble of inserting the pins one by one, thereby improving the efficiency of assembling the chair.

  Similarly, in the invention of claim 2, either one or both of the front connecting part and the rear connecting part of the seat part moves the seat part or moves the front link, so that the front link or the back support device is moved. Therefore, it is possible to eliminate or reduce the trouble of inserting the pins one by one, thereby improving the efficiency of assembling the chair.

  In the invention of claim 3, since the seat portion is fitted to both the front link and the back support device, it is possible to further contribute to an increase in efficiency of assembly work. In the third 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 2 and 3, the connection structure between the front link and the seat can be embodied in various ways. However, if the fitting method of the laterally long boss part and the female fitting part is adopted as in Claim 4, the connection structure Since the state can be held firmly, 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, it should have a form with excellent aesthetics. Can be easily realized, and it is possible to eliminate the generation of rubbing noise when locking.)

  When the seat portion is composed of the seat body and the seat receiving body as in claim 5, 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. In addition, the seat body can be attached to the seat support body so that the front-rear position can be adjusted. In addition, 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 portion advances with the return rotation of the back support device. In this case, it is preferable to employ a system in which the stopper is inserted into the seat receiving body as described in claim 6 because the stopper can be reliably 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 explanation and claims, the terms “front and rear” and “left and right” are used to specify the direction, but this term defines the direction in which a person sitting in a normal posture on a chair is facing forward. Yes. The front view is seen from the direction opposite to the seated person.

(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 synthetic resin and a cushion material 6 arranged on the upper surface thereof, and the cushion material 6 has an outer skin such as a cloth. The material is stretched. In addition, the seat plate 5 is attached to a synthetic resin seat receiver (seat outer shell) 7 so that it can be moved back and forth. 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 includes a synthetic resin back frame 10 and a synthetic resin back plate 11 fixed to the front surface thereof. The back plate 11 is in the form of horizontal stripes with horizontally long holes, and a skin material 12 such as a mesh is stretched on the back plate 11. 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 includes a vertically long left and right side frame 13, an upper frame 14 that connects the upper ends thereof, and a lower frame 14 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 includes 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. . A swing member 18 made of a metal plate is connected to the rear portion 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 swing member 18 with screws. . In the present embodiment, the swing member 18 corresponds to the second member, and the base 2 can also be referred to as the first member.

  Therefore, in this embodiment, the back support device described in the claims is constituted by the swinging member 18, the forward arm portion 16 of the back frame 10, and the joint portion 17, and the backrest 4 is centered on the first shaft 19. And 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.

  The swing member 18 is integrally provided with a support arm 18a extending forward and upward in a tilted side view, and a rear engagement pin 20 as an example of an engagement portion is inserted into the tip of the left and right support arms 18a. ing. For example, as shown in FIG. 5 and FIG. 8B, a pair of left and right rear engagement claws 21 that are hooked and engaged with the rear engagement pin 20 from behind are integrally formed on the lower surface of the seat support 7. . For this reason, when the backrest 4 tilts backward, the seat receiver 7 and the seat body 3 are pulled backward.

  On the other hand, for example, as shown in FIG. 5, the base 2 is made of a metal plate and has a box shape with an upward opening having left and right side plates 2 a, and a horizontally elongated second shaft 22 at the front thereof. The front link 23 having a single structure is rotatably connected to the second shaft 22, and the upper end of the front link 23 is rotatable to a female fitting portion 24 formed on the seat support 7. Is inserted. Therefore, when the seated person leans on the backrest 4, the seat receiving body 7 is pulled backward by the swing member 18, and the front link rotates accordingly, 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 described above, the base 2 is in the form of a box that opens upward. For example, as shown in FIG. 5 and FIG. The inner bracket 31 is welded, a bush 32 is fixed to the inner bracket 31 and the bottom plate of the base 2, and the leg support 1 is fitted to the bush 32 from below.

  A second inner bracket 33 having a U-shaped upward opening is fixed to the first inner bracket 31 so that the base end portion of the armrest device is inserted into the space surrounded by the inner brackets 31 and 33 from the lateral direction. It has become. As shown in FIG. 5, the side plate 2 a of the base 2 has a hole for inserting the base end portion of the armrest device, and the left and right end portions of the second inner bracket 33 are exposed to the outside of the base 2. The downward piece 33a is formed in the front-end | tip, and the base end part of an armrest apparatus is fastened with a screw | thread with the downward piece 33a.

  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. The clamping slot 36 is constricted at the upper end thereof, so that the lower cover 26 is fitted into the second shaft 22 by being deformed against elasticity.

  The swing member 18 is a basic form having an upper plate and left and right side plates 18b. The base 2 is surrounded by the left and right side plates 18b from the outside. 19 penetrates. 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 third shaft 37 is inserted through the rear part of the left and right side plates of the swing member 18. On the other hand, for example, as shown in FIG. 4, the forward arm portion 16 of the back frame 10 has a thick wall shape with a certain right and left width, and a forward opening that fits into the first shaft 19 at the tip of the left and right forward arm portion 16. A groove 38 is formed, and a downward opening groove 39 that fits from the upper part to the tip of the third shaft 37 is formed at a position behind the forward opening groove 38.

  Both the opening grooves 37 and 38 are not opened to 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. 6A, a pair of left and right fixed rubbers 44 as an example of an elastic body are interposed between the pressing member 41 and the base 2, and the fixed rubbers 44 are attached to 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. That is, the fixed rubber is pre-tensioned.

  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 42 that is schematically shown by a line. ing.

  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.

  On the side plate 18b of the swing member 18, an escape groove 50 into which the rotary lever device 27 is fitted is opened backward. As shown in FIG. 5, 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). Switch to the state. 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 number of slits are formed in the seat plate 5 so as to bend (sink) when seated. For example, as can be understood from FIG. 2, the seat plate 5 is gently curved in an upwardly concave shape in a front view, the front end portion is bent with a large curve downward, and the rear portion is warped upward with a gentle curvature. 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 (see FIG. When the lever is pulled back, it becomes a slidable free state, and when the lever is returned by the spring, it becomes a non-slidable locked state. In FIG. 12, two pairs of guide claws 54 protrude upward on both the left and right sides of the seat support body 7, but these four guide claws 54 fit in a long groove formed in the seat plate 5 so that they cannot be pulled upward. 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. Accordingly, the left and right rear engaging claws 21 are surrounded by the side protruding wall 55 and the front protruding wall 56 from three directions. 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 locked, the rear engaging claw 21 is pulled backward by the rear engaging pin 20, but the seat receiving body 7 must be pushed forward by the rear engaging pin 20 when the locking is returned. 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 engages with the stopper receiving portion 62 from below. As a result, the stopper 57 is held so that it cannot be removed. 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 support 7 are held so as not to move relative to each other.

  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.

  When the structure which forms the step part 57b in the latching piece 57a of the stopper 57 and meshes this with the stopper receiving part 62 like this embodiment is employed, there is an advantage that the stopper 57 can be accurately prevented from shifting in the left-right direction. is there.

  As described with reference to FIGS. 5 and 10A, 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. 10A, the upper cover 25 is formed with a pair of left and right pin receiving portions 64 that receive the rear engagement pins 20. 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 support 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.

  Further, the upper cover 25 is provided with an upward inner wall portion 69 protruding toward the upward front wall portion 67 at the inner end of the upward rear wall portion 68. Accordingly, even if a person tries to hit the rear engagement pin 20 or the rear engagement claw 21 from behind, the person cannot be guarded by the upward rear wall portion 68 and the upward inner wall portion 69. Therefore, the safety can be prevented. Is secured.

  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. In view of this, a thin-walled downward positioning piece 70 is provided at two locations near the front end and the rear end of the left and right side plates 25 a in the upper cover 25, and this downward positioning piece 70 is placed on the side plate 26 a in the lower cover 26. It fits into a positioning groove (not shown) formed on the end face.

  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 portion 78 and the side bearing groove portion 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 a bag shape (see FIG. 17), and the second shaft 22 is held by the outer wall 79a so that the left and right sides cannot be removed.

  Both bearing groove portions 78 and 79 have a U-shaped cross section so as to be fitted to and removed from the second shaft 22, and a pair of left and right bearing bushes 81 are mounted on 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. The inner bearing groove 78 has a high rigidity because it extends long to the left and right.

  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 retreat limit 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.

  The left and right sides of the female fitting portion 24 are U-shaped bearing portions 87, and the left and right bearing portions 87 penetrate 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 is located at a position positioned in front of the boss portion 86 with the front link 23 in a substantially vertical posture. 86 is formed at a certain distance, and an intermediate bottom plate 93 is formed at a position located below the boss 86 with the front link 23 in a substantially vertical position.

  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. The vertical length L is set to be longer than the distance E between the front and rear restricting pieces 88 and 89 in the female fitting portion 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 will not come out of the female fitting part 24. The insertion of the boss 86 into the female fitting portion 24 is performed by elastically deforming the engaging claw 89.

  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) Attach the second shaft 22 and the upper cover 25 to the base 2, connect the swing member 18 to the base 2 with the first shaft 19, and fit the control unit 29 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.
4) The rubber is compressed by tilting the back frame 10 backward, and 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 and the rear engagement pin 20 is moved. Abutting on the pin receiving part 64 of the upper cover 25 (In this state, since the rubber is slightly compressed, the rear engagement pin 20 strongly abuts on the pin receiving part 64 and pre-tensioning is effective when locking. ),
5) The front link 23 is connected to the seat receiving body 7 in advance, and the front link 23 is brought into a substantially vertical posture so that the boss portion 86 and the female fitting portion 24 of the seat receiving body 7 are fitted together. Then, the rear engagement claw 21 is hooked and engaged with the rear engagement pin 20 from behind.
6) Attach the stopper 57, and then attach the seat 3 to the seat receiver 7.
It is assembled in the procedure. The backrest 4 may be attached after the seat body 3 is attached or later. The front link 23 may be attached to the seat receiver 7 first. 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.

  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 (swing member 18) are performed by inserting pins. Since the front link 23 and the seat support 7 can be moved in a direction orthogonal to the axis of each of the shafts 19, 22, and 37 without the need for one-touch operation, the efficiency of assembling the chair can be significantly improved.

  Now, the rear engaging claw 21 can be fitted with the rear engaging pin 20 by deformation against its elasticity. However, this requires a strong force to be fitted, which is a burden on the operator. There is a problem to force. On the other hand, when the structure that prevents the Lee engaging pin 20 from coming out of the rear engaging claw 21 by the stopper 57 as in the present embodiment is adopted, the rear engaging pin 20 and the rear engaging claw 21 play loose. Even if it is in a state of being fitted with each other, it is possible to securely hold the fitted state, which is an advantage that it can be firmly connected while ensuring 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 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 if the person does not hold it by hand, it does not move or come off, and therefore the seat support 7 can be easily attached when assembling the semi-finished product through the line. 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 up and down, but it is considered that a finger is not 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 tens of meters) 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. Mm) space S <b> 1 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. Therefore, fingers are not pinched 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 sides. Further, the front link can be hooked only on one of the base and the seat receiving body, and the other can be connected by inserting a pin. The front link and the base can be connected by forming a boss portion on the front link and fitting it into a female fitting portion provided on the base, and further, a means for connecting the front link and the seat receiving body. As an alternative, 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, but the forward arm portion of the back frame and the swing member in the embodiment may be integrated, or A back frame in which a back frame and a back column are integrally formed can be used as a back support device as it is. A member other than the back support device can be used as the second member.

  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, but 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 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 the chair of the present invention and its usefulness is exhibited. 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 The core example of a back support apparatus, and an example of a 2nd member Moving member 19 First shaft 20 which is tilting fulcrum of backrest 21 Rear engaging pin 21 Rear engaging claw which is an example of rear connecting portion 22 Second shaft 23 Front link 24 Female fitting portion 25 as an example of front connecting portion 25 Top cover 56 Stopper 64 Top cover pin receiving part 86 Front link boss part

Claims (1)

A base provided at the upper end of the leg as a first member, and a seat disposed above the base;
The seat has a first connecting part connected to the base via a link, and a second connecting part connected to a second member attached to the base, and the first connecting part An engagement method in which at least one of the connection with the link or the connection between the second connection portion and the second member is fitted by moving the seat portion in a direction perpendicular to the rotation axis of the link. It has become,
Chair.

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