JP2011092392A - Rocking chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure safety so that a person may not pinch his fingers in a chair wherein the seat section retracts while being raised when the chair is rocked. <P>SOLUTION: The front section of a seat receiver 7 and a base 2 are connected by a front link 23, and the rear section of the seat receiver 7 is connected with a rocking member. At the time of rocking, the seat receiver 7 is pulled backward by the rocking member, and therefore, the seat receiver 7 retracts while being raised. On the seat receiver 7, an upper female fitting section 24 facing downward is installed, and the front link 23 is connected with the upper female fitting section 24. Also, on the rear section of the seat receiver 7, a rear engaging claw 21 facing downward is installed, and a rear engaging pin 20 is connected with the rear engaging claw 21. Since a large space S1 is present between the seat receiver 7 and the base 2, the person does not pinch his fingers. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a chair in which a seat moves up and down and moves back and forth during locking.

  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. Often uses coil springs or gas springs.

  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 chair in which a seat moves up and backwards when a backrest tilts backward by a link mechanism similar to a parallel link mechanism.

  That is, in Patent Literature 1, the front part of the seat and the base are connected to the front link in a side view forward tilted posture (accurately tilted forward with respect to the vertical line) with a pin, while the backrest is attached. The back frame and the seat are connected by a pin at a position 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. In the patent document, a coil spring is used as an elastic means, and the coil spring is arranged behind the pivot point of the back frame.

  According to the configuration of Patent Document 1, since a part of the weight of the seated person acts to return the backrest even when locking, the force that acts on the elastic body when locking is very small. It can be said that it can contribute to cost reduction and downsizing of the base part. More specifically, the moment acting on the backrest during rocking is generally proportional to the weight of the seated person, but the load acting to push down the seat when rocking is also proportional to the body weight. Even if they are different, the same degree of rocking feeling can be obtained with one kind of elastic means.

US Pat. No. 6,709,058

  Now, in the chair where the seat rises when rocking, even if a person inserts a finger in the seat or downward, it is safe to prevent the finger from being caught between the seat and the base when the backrest is turned back. It is necessary to secure. However, in Patent Document 1, no consideration is given to ensuring such safety.

  The present invention has been made in view of such a current situation, and is intended to provide a chair in which a seat rises and lowers when locking in a safe manner in which a person does not pinch a finger.

  A chair according to the present invention has a base provided at the upper end of a leg, a seat disposed above the base, a back support device connected to the base so as to be tiltable rearwardly, and a backrest provided on the back support device. A front connection portion connected to the base via a front link and a rear connection portion connected to a portion of the back support device that is in front of the rotation fulcrum on the lower surface of the seat portion. A space that is provided so that the front connecting portion and the rear connecting portion protrude downward, so that even if a person (general adult) inserts a finger between the seat portion and the base, Is open.

  According to a second aspect of the present invention, in the first aspect of the present invention, the base has a box shape with an upward opening having a front wall at the tip, and the left and right sides of the front link are fitted to the front portion of the base so as to be rotatable. While a horizontally long shaft is disposed, the front link forms a space into which the front plate of the base fits, and a space formed by the front inner surface of the space and the front wall of the base And a front flange is formed at the upper end of the front wall of the base.

  According to a third aspect of the present invention, in the first or second aspect, the rear connecting portion of the base and the back support device are connected by a rear pin, and an upper cover having a receiving portion for the rear pin is attached to the base. The upper cover is formed with an upward wall surrounding the rear engagement pin, and the lower surface of the seat portion is formed with a downward projecting wall surrounding the upper cover from the outside. There is only a narrow gap between the downward projecting wall and the person cannot insert a finger.

  In the present invention, since the front connecting part and the rear connecting part protrude downward, a space is provided between the seat part and the base so that there is enough space even if a person inserts a finger. At this time, in a chair in which the elastic means can be reduced in size by raising the seat, it is possible to prevent the fingers from being pinched between the seat portion and the base and to ensure safety.

  As a means for preventing finger pinching, it is conceivable to cover with a large cover so that hands and fingers cannot be inserted between the seat and the base, but this not only increases the cost, but the cover is conspicuous. The aesthetics may not be good. On the other hand, the invention of the present application can prevent finger pinching by devising the connection structure, so that it is possible to suppress the cost increase by eliminating the need for a large cover, and it is possible to realize a clean appearance and improve aesthetics.

  Since the front link rotates during locking, it is necessary to prevent a finger from being caught between the front link and the base. In this regard, if the configuration of claim 2 is adopted, even if a person inserts a finger into the front part of the base, there is a space larger than the finger between the base and the front link, so the front and front links of the base The finger is not pinched, and even if it tries to insert the fingertip into the upper surface of the front plate in the base, this is blocked by the forward flange of the base, so the finger is pinched between the upper end surface of the front plate of the base and the front link There is nothing. Note that prevention of finger pinching between the front link and the seat can be handled by the means described in the embodiment.

  Since the rear connecting part moves back and forth while moving up and down during locking, it is necessary to consider prevention of pinching of fingers at the rear connecting part. If the structure of this point and Claim 3 is employ | adopted, the connection location of the back connection part of a seat part and the front-end part of a back support device will be the upper protrusion wall of an upper cover, and the downward protrusion wall of a seat part before and behind locking. Since it is covered, safety can be ensured.

(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. .

  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 an inclined posture in a side view, and a rear engagement pin 20 as an example of a rear pin described in the claims at the tip of the left and right support arms 18a. Is inserted. 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 rotated to the upper female fitting portion 24 formed on the seat receiving body 7. Inserted as possible. 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 portion 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 26a of the lower cover 26 has a hole 34 into which the base end portion of the armrest device is fitted. The hole 34 is closed by a detachable lid 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, and a first shaft is formed on the left and right side plates 2a of the base 2 and the left and right side plates 18b of the swing member 18. 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 38 and 39 are not opened to the left and right outside, 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. 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 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 Then, the position is switched between a locking posture that abuts against the rear end edge of the base 2 so as to hardly lock, and a free posture in which locking is allowed without hitting the rear end edge of the base 2.

  In addition, the lock lever 49 can be switched to three postures so that the backrest 4 is in a completely locked state in which the backrest 4 hardly tilts backward, an intermediate lock state in which the backrest 4 rotates about half of the maximum rearward tilt angle, and the backrest 4 has It is also possible to set so as to switch to a free state that rotates only by the maximum stroke, and it is also possible to switch in four or more stages, and a plurality of these switching can be performed on the lock body 51 or the base 2 (or both). This can be realized by forming the step portion.

  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 53 is attached to the slider 52, and the slider When 52 is moved left and right, the movable rubber 53 is supported by the base 2 via the step 45a of the receiving member 45, and the movable rubber 53 is not supported by the receiving member 45 (it can rotate freely without being compressed). It will switch to a weak 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. The movable rubber 53 also constitutes a part of the elastic means described in the claims.

(2) Relationship between the seat portion 8, the upper cover 25, and the swing member 18 Next, the relationship between the seat portion 8, 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, as an example of a rear connecting portion that connects the seat receiver 7 and the swing member 18 to the lower surface of the rear portion of the seat receiver 7. A pair of left and right rear engagement claws 21 having a bowl shape facing forward in a side view are integrally provided. 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 and the rear engagement pins 20 are held so as not to be detached. 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 engagement pin 20 is pulled backward by the rear engagement claw 21. However, when the locking is returned, the seat receiving body 7 must be pushed forward by the rear engagement pin 20. 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 the seated person performs an action such as placing a fingertip against 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 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 (so as to come into surface contact). 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 includes an upward side wall 66 that surrounds the pin receiving portion 64 from the left and right sides, an upward front wall 67 that is integrally continuous with the front end of the left and right upward side wall 66, and an upward direction that is integrally continuous with the rear end of the left and right upward side wall 66. A rear wall 68 is projected. As shown in FIG. 7, the front projecting wall 56 of the seat receiving body 7 is disposed in the vicinity of the front side of the upward front wall 67 of the upper cover 25. In other words, there is only a slight gap between the upward front wall 67 and the front projecting wall 56 so that a person cannot insert a finger, for example, 5 mm or less.

  For this reason, even if a person tries to insert the fingertip into the rear engagement pin 20 from the front, the person cannot be touched by being guarded by the front protruding wall 56 of the rear connecting portion 7 and the front wall 57 of the upper cover 25. The front surface of the upward front wall 67 and the rear surface of the front projecting wall 56 are curved in a rearward convex shape in a side view, and therefore, the seat support body 7 is allowed to retreat while rising, and the seat support Even if the body 7 moves, the distance between the front surface of the front wall 67 and the front protruding wall 56 does not increase.

  Further, it is conceivable that a person tries to apply a finger from the side toward the rear engagement pin 20, and this point is guarded by the side protruding wall 55 of the seat receiving body 7 and the upward side wall 66 of the upper cover 25. Has been. The distance between the side protruding wall 55 of the upper cover 25 and the upward side wall 66 of the upper cover 25 is set to 5 mm or less, and the side protruding wall 55 covers the upward side wall 66 from the side even if the seat support 7 moves. The state has been secured. In the state where the seat receiving body 7 is fully lowered, as can be understood from FIG. 1B, there is a margin even if a person's finger is applied between the front projecting wall 56 of the seat receiving body 7 and the upper cover 25. A certain interval (for example, 20 mm or more) is vacant. Therefore, the finger is not sandwiched between the front projecting wall 56 of the seat receiver 7 and the upper cover 25.

  In addition, as can be understood from FIG. 7, there is a sufficient space between the lower surface of the front projecting wall 56 of the seat support 7 and the upper surface of the upper cover 25 even if a person's finger is applied. Therefore, a finger is not sandwiched between the lower surface of the front protruding wall 56 and the upper surface of the upper cover 25.

  Furthermore, for example, in FIG. 10, an upward inner wall 69 protruding toward the upward front wall 67 is provided at the inner end of the upward rear wall 68 in the upper cover 25. Therefore, even if a person tries to hit the rear engaging pin 20 or the rear engaging claw 21 from behind, the person cannot guard against the upper rear wall 68 and the upper inner wall 69, and the rear engaging pin 20 A finger is not pinched by the upper cover 25.

  Further, as can be understood by combining FIG. 7 and FIG. 10, the seat receiver 7 is fully lowered between the seat rear body 7 and the upward rear wall 68 and the upward inner wall 69 of the upper cover 25. , There is a vacant space (up and down spacing) even if a person inserts a finger. Therefore, the finger is not pinched between the upward rear wall 68 or the upward inner wall 69 of the upper cover 25 and the seat support 7.

  As described above, the presence of the downward projecting walls 55 and 56 and the upward walls 66 to 69 prevents a person from pinching a finger between the rear engagement pin 20 and the rear engagement claw 20 and its peripheral portion, thereby improving safety. It can be 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 has a rough appearance such as a thick plate or a block due to a combination of a large number of plate-like ribs. For example, as shown in FIG. 17B, a lower inner female fitting portion 78 that fits on the second shaft 22 inside the base 2 and a second inner female fitting portion 78 outside the base 2 are provided at the lower end portion of the front link 23. A lower side female fitting portion 79 fitted to the biaxial shaft 22 is provided.

  A slit groove 80 is formed between the lower inner female fitting portion 78 and the lower side female fitting portion 79 so as not to hit 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. It is also possible to adopt only the lower inner female fitting portion 78 or only the lower side female fitting portion 79 as the lower female fitting portion.

  The lower female fitting 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 mounted in the lower 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 lower inner bearing groove portion 78 against elasticity. Accordingly, the left and right bearing bushes 81 function as bearings at the lower end portion of the front link 23, and other portions are not in contact with the second shaft 22. The lower inner bearing groove portion 78 extends to the left and right and has high rigidity.

  Since the bearing bush 81 is U-shaped in a side view, it can be attached to the second shaft 22 by one-touch fitting from above (it can be fitted in a backward tilted posture). As shown in FIG. 14, the front end portion 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 side of the lower inner bearing groove portion 78 of the front link 23 is As an example of the retaining means, a plurality of restriction ribs 84 that are close to the front wall 2c of the base 2 are formed. With the restriction ribs 84, the front link 23 is tilted forward (use posture) from the second shaft 22. Exiting is prevented.

  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.

  For example, as clearly shown in FIG. 14, the front link 23 is formed with an intermediate bottom plate 93 that divides the front link 23 into a half that is close to the upper female fitting portion 24 and a half that is close to the second shaft 22. The upper half close to the upper female fitting portion 24 across the upper portion is open, and the upper space S3 that opens substantially upward in use is empty, and the lower half near the second shaft 22 across the intermediate bottom plate 93 is connected to the intermediate bottom plate 93. Surrounded by the back plate 96 and the female fitting portions 78 and 79, a lower space S4 is opened in a downward opening (a forward opening in a vertical posture).

  The front plate 2c of the base 2 enters the lower space S4, and the regulation rib 84 is disposed in the lower space S4. A space that is a part of the lower space S4 exists between the intermediate bottom plate 93 of the front link 23 and the front plate 2c of the base 2, but this space can be afforded even if a person inserts a finger. Since a certain size is set, the finger is not sandwiched between the intermediate bottom plate 93 of the front link 23 (the front inner surface of the void S4) and the front plate 2c of the base 2. Further, a front flange 2d is formed in the state of the front plate 2c in the base 2, and even if a person tries to get the fingertip into the base 2 beyond the front plate 2c, this is blocked by the front flange 2d. The Therefore, a finger is not pinched between the front link 23 and the base 2.

(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), an upper female fitting portion 24 that is laterally long and opened downward is projected downward as an example of the front connecting portion at the front portion of the seat support 7. . On the other hand, as an example of the upper connecting portion, a boss portion 86 that fits into the upper 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 upper female fitting portion 24 are bearing portions 87 having a U-shaped cross section, and the left and right bearing portions 87 penetrate vertically. A front restricting protrusion 88 extending in the left-right direction between the left and right bearing portions 87 is formed on the front portion 24a of the upper female fitting portion 24 so as to protrude into the groove. On the other hand, the rear portion 24b of the upper female fitting portion 24 has an engagement claw 89 having a side view when 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 protrusions 90 positioned in the groove and facing the groove are formed. These front and rear restricting projections 88 and 90 constitute a means for preventing the upper female fitting portion 24 from coming off. Note that only one of the front and rear restricting projections 88 and 90 is sufficient.

  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 supported at both ends supported by the left and right side plates 23 a, 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 vertical posture. And are formed at some distance.

  The upper space S3 described above is vacant between the front cover portion 92 and the intermediate bottom plate 93 and the boss portion 86. For this reason, the boss portion 86 is fitted into the upper female fitting portion 24, and the front link 23 is inserted. Is allowed to rotate around the boss 86. The left and right side plates 23a of the front link 23 are positioned on the left and right outer sides of the upper 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 positioned vertically in the portion excluding the left and right bearing portions 87. In the state of the posture, the cross section is substantially rectangular in the side view, and the lateral width dimension W is set to be approximately the same as the distance dimension E between the front and rear restricting projections 88, 90 in the upper female fitting portion 24. The vertical length L is set to be longer than the distance E between the front and rear restricting projections 88 and 89 in the upper 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 upper female fitting portion 24 and tilted forward greatly. In such a use state, even if the seat receiving body 7 is raised upward, it does not come out of the upper female fitting portion 24. Therefore, in this embodiment, the part corresponding to the front and rear restricting projections 88 and 89 of the upper female fitting part 24 in the boss part 86 is a non-circular (substantially rectangular cross-section) restricting part described in the claims. The boss portion 86 is inserted into the upper female fitting portion 24 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.

  As shown in FIG. 14, a gap S2 exists between the front end of the front cover part 92 and the front lower end of the upper female fitting part 24 in the front link 23. The gap S2 is formed by the front link 23. Even if it rotates, there is only a little (5mm or less). For this reason, a person does not pinch a finger at the position of the gap S2.

  Further, even if a finger is inserted into a position between the front end portion of the front link 23 and the rear surface of the upper female fitting portion 24, the finger is guarded by the reinforcing rib 94 and the intermediate bottom plate 93 of the front link 23 and the upper female fitting portion are provided. Since the upper space S <b> 3 with respect to 24 has an interval of 20 mm or more, the intermediate bottom plate 93 and the upper female fitting portion 24 do not pinch fingers. As shown in FIG. 14, a guard plate 98 is provided on the inner surface of the front lower portion 92 of the front link 23 so as to be in contact with or in close contact with the lower end of the rear portion 24 b of the upper female fitting portion 24. Therefore, even if the person forcibly inserts the fingertip into the upper space S3, the fingertip hits the guard plate 98 and cannot be inserted any further. Therefore, a finger is not sandwiched between the front cover portion 92 of the front link 23 and the upper female fitting portion 24.

  As clearly shown in FIGS. 1 and 16, the upper female fitting portion 24 protrudes greatly downward from the lower surface of the seat receiver 7, and thus the front link 23, the upper female fitting portion 24, Is greatly protruded from the lower surface of the seat receiving body 7 so that a large space S1 in which any number of human fingers can enter between the seat receiving body 7 and the base 2 (or the upper cover 25) with a margin is provided. Forming.

  Further, as clearly shown in FIG. 16, the back surface of the upper female fitting portion 24 and the lower surface of the seat support 7 are continuous with an arc surface (curve) having a considerably large curvature. Even if a finger is applied to the base of the female fitting portion 24, no injury will occur. Needless to say, it is also applicable to other members to project the bearing part greatly or to form an arc surface having a large curvature at the base part.

(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 fixed rubber 44 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 engage the rear. The pin 20 is brought into contact with the pin receiving portion 64 of the upper cover 25 (in this state, the fixed rubber 44 is slightly compressed, so that the rear engagement pin 20 strongly comes into contact with the pin receiving portion 64 and pre-locking is performed. Tension is working)
5) The lower female fitting portions 78 and 79 are fitted to the second shaft 22 by setting the front link 23 in a substantially vertical posture, and then the rear engagement claw 21 is engaged with the rear engagement pin 20 from behind, Next, a front link 23 is made to the seat support 7.
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 after the attachment of the seat body 3 or may be performed before. The front link 23 may be connected to the seat receiver 7 in advance.

  The front link 23 is attached to the seat receiver 7, the front link 23 is attached to the base 2, and the seat receiver 7 is attached to the rear engagement pin 20 (the swing member 18). 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 requiring work, the efficiency of the chair assembling work can be greatly improved.

  And as already stated, the space (S1 to S4, etc.) existing at the location of the moving member is large enough to allow insertion of a fingertip, or a narrow interval at which a person cannot hold a monk on the fingertip. Therefore, even if a person inserts his / her hand into the lower surface of the seat receiving body 7, his / her finger is not pinched and it is safe.

  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.

(6). Others The present invention can be embodied in various ways other than the above embodiment. For example, the front link can be inserted into only one of the base and the seat receiving body, and the other can be connected by inserting a pin. As the structure of the lower connecting part that connects the front link and the base, it is possible to form a boss part on the front link and fit it into the lower female fitting part provided on the base. As a configuration for connecting the seat receiver, an upper female fitting portion may be formed on the front link and a boss portion may be formed on the seat receiver. Of course, the female fitting part and the male fitting part can be developed in various structures.

  When a male fitting part is provided in the base as a connecting structure between the front link and the base, the male fitting part does not necessarily have to be a shaft, but a boss part made of a resin molded product, die cast product, sheet metal processed product, etc. It is also possible to provide. It is also possible to attach a shaft to the seat (seat receiver) and fit the upper female fitting part of the front link to this. In this case, a regulating rib as a retaining means is formed on the front link. You may form in a seat part and may form in both. In forming the boss portion as a non-circular restricting portion as a retaining means, an elliptical shape or an oval shape can be adopted as the cross-sectional shape of the restricting portion.

  In the above 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, 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 provide a connecting part such as an upper female fitting part or a rear engaging claw on the seat plate. It is also possible to use a spring such as a coil spring as the elastic means.

  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)
2 Base 2c Front wall 2d Base forward flange 3 Seat body 4 Backrest 7 Seat receiver 8 Seat portion 10 Back frame 16 Forward arm portion constituting a part of the back support device 18 Swing member constituting the back support device 19 A first shaft that is a pivot for pivoting a backrest 20 A rear engaging pin as an example of a rear pin 21 A rear engaging claw as an example of a seat receiving body of a seat receiving body 22 A second as an example of a lower male fitting portion Shaft 23 Front link 24 Upper female fitting portion constituting front connecting portion of seat receiving body 25 Upper cover of base 26 Lower cover of base 45, 53 Rubber as an example of elastic means 78 Lower inner female fitting of front link Joint portion 79 Lower side female fitting portion of front link 84 Restriction rib 86 Front link boss portion

Claims (3)

A base provided on the upper end of the leg; a seat disposed above the base; a back support device coupled to the base so as to be tiltable rearwardly; and a backrest provided on the back support device. The lower surface is provided with a front connecting portion connected to the base via a front link, and a rear connecting portion connected to a portion of the back support device that is in front of the rotation fulcrum,
By adopting a form in which the front connecting part and the rear connecting part protrude downward, there is a space that is not pinched even if a person inserts a finger between the seat part and the base.
Rocking chair. The base has a box shape with an upward opening having a front wall at the front end, and a left and right horizontally long shaft on which the front link is rotatably fitted is disposed at the front of the base. The link is formed with a space in which the front plate of the base fits, and a space formed by the front inner surface of the space and the front wall of the base has a margin even if a human finger is inserted. Having a certain size and forming a forward flange at the upper end of the front wall of the base;
The rocking chair according to claim 1. The rear connecting portion of the base and the back support device are connected by a rear pin, and an upper cover having a receiving portion for the rear pin is attached to the base, and the upper cover surrounds the rear engaging pin. While a wall is formed, a downward projecting wall that surrounds the upper cover is formed on the lower surface of the seat portion, and a person inserts a finger between the upward wall and the downward projecting wall. There are only narrow gaps that cannot be made,
The rocking chair according to claim 1 or 2.

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