JP2014097182A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify mounting of a seat, and to impart a more beautiful appearance, in a nesting type chair with the seat that can be raised or folded.SOLUTION: A seat is mounted on a movable base body (a seat receiving body) 4. The movable base body 4 has right and left upward arm parts 22, and a bearing part 23 provided on an upper end of the upward arm part 22 is fit in a spindle 24 of a support frame 19. Therefore, the movable base body 4 rotates by using the spindle 24 as a center. The bearing part 23 is cut in such a manner to open downwardly and is fit in the spindle 24 from above. A screw 26 is used for preventing fall-off. Since the bearing part 23 is integrally molded on the upward arm part 22, a chair is excellent in terms of the beautiful appearance.

Description

  The present invention relates to a chair in which a seat is flipped up on left and right support frames to be freely pivoted.

  In a nesting chair that can be fitted back and forth, the seat can be flipped up and turned. The nesting chair often has a leg device made of a metal pipe, and generally, support frames constituting the leg device are arranged on both the left and right sides of the seat. Therefore, the seat is often connected to the left and right support frames so as to be able to be flipped up and rotated.

  An example thereof is described in Patent Document 1. That is, in this patent document 1, the upper end of the rear leg constituting the leg device is protruded above the seat surface to form a backrest support rod, and when the backrest and the seat are attached to the backrest support rod, the backrest support rod A seat support bracket is suspended from a support shaft projecting inwardly, and the seat support bracket is fixed to the side surface of the seat with screws.

Japanese Patent No. 45944949

  In Patent Document 1, since the pivot point for raising the seat is approximately the same as the lower end of the backrest, it can be said that the lower end of the seat and the lower end of the backrest can be aligned in a state in which the seat is raised up and the aesthetics are good. . However, there is a problem that a cover for hiding the bracket is necessary and a problem that it takes time to assemble.

  The present invention has been made to improve the current situation.

  The present invention is specified in each claim. Of these, the invention of claim 1 constitutes a superordinate concept, comprising a seat and a support frame disposed on the left and right outer sides of the rear portion, and connected to the support frame so that the seat body can be flipped up and rotated. In this configuration, an upward arm portion protruding above the seat surface is integrally provided at the rear portion of the seat or the seat receiving body to which the seat is attached, and the upper end portion of the upward arm portion is fitted to the supporting shaft and the bearing that are fitted to each other. The support frame is connected to the support frame by a pair.

  In this first aspect, there is no limitation on whether the bearing portion and the support shaft are provided on the upward arm portion or the support frame, and the support shaft may be provided on the support frame and the bearing portion may be provided on the upward arm portion. And a bearing part may be provided in a support frame and a support shaft may be provided in an upward arm part. However, in general, it can be said that it is preferable to provide a support shaft on the support frame and a bearing portion on the upward arm portion.

  The invention of claim 2 embodies claim 1, and in this invention, an inward support shaft is fixed to the support frame, while a bearing portion is provided on the upward arm portion, The bearing portion is provided with a downward notch so that the bearing portion can be moved downward and fitted into the support shaft.

  The invention of claim 3 is a preferred embodiment of claim 1 or 2, wherein the support shaft is made of metal, and a resin bush is interposed between the support shaft and the bearing portion. . As a development example of the invention of claim 3, in claim 4, the bush is held non-rotatably on the bearing portion, and an engagement groove is formed on the outer periphery of the support shaft. In addition, an elastic engagement portion that fits into the groove in a state where the seat is flipped up is provided.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the bearing portion includes a middle wall that overlaps an end surface of the support shaft, and the middle wall is formed by a screw via an elastic member. Presser is held on the end face of the spindle. In this case, according to a sixth aspect of the present invention, the elastic member is a disc-type spring washer, and two disc-type spring washers are reversed and overlapped.

  In this invention, since the upward arm part is integrally provided in the seat or the seat receiving body, it is excellent in aesthetics and does not need to be hidden by the cover. For this reason, it can also contribute to reduction of a number of members.

  Further, when the structure of claim 2 is adopted, for example, even when the support shaft is fixed or integrated with the support frame in advance, the bearing portion can be fitted into the support shaft from above, so that the assembly work Can be done quickly. This is one of the great advantages of the present invention.

  If the structure of Claim 3 is employ | adopted, durability can be improved and generation | occurrence | production of the noise at the time of rotation can also be prevented by manufacturing a bush with the material which is excellent in abrasion resistance and has a small friction coefficient. In this way, when the bush is used, if the configuration of claim 4 is adopted, the seat can be held in a state where the seat is flipped up by using the bush, so that the seat can be prevented from falling forward without increasing the number of members. Further, according to the fourth aspect of the present invention, since the person can grasp by touch that the elastic engagement portion of the bush fits into the engagement groove of the support shaft (that is, because a click feeling can be given to the person), the seat is predetermined. There is also an advantage that the person can be informed that it has been jumped to the posture.

  In addition, as in the embodiment, it is possible to form an engagement groove on the support shaft in which the elastic engagement portion fits in a state in which the seat is tilted, and to hold the seat in a tilted posture. Is advantageous in that it can prevent the seat in the tilted state from moving up and down during movement or the like.

  Further, when the bearing portion is attached via an elastic member as in claim 5, it is possible to prevent or remarkably suppress the seat in the raised state from being tilted by vibrations during transportation or the like (more preferably in combination with claim 4). ). In this case, when a dish-type washer is used as the elastic member as in claim 6, there is an advantage that a high elastic force can be imparted using an inexpensive commercial product.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view of the chair which concerns on 1st Embodiment, (A) is the whole perspective view of the state which fell down the seat, (B) is the whole perspective view in the state which flipped up the seat, (C) is the part of the backrest FIG. The perspective view of the state which isolate | separated the seat, (B) is a perspective view of a seat receiving part. It is a separation perspective view in the state where a seat was omitted. It is a separation perspective view showing a locking mechanism. (A) is a partially separated perspective view of a seat part, (B) is a figure which shows the relationship between a slider and a support stay, (C) is CC sectional view taken on the line of (B). (A) is the isolation | separation perspective view which shows a part of interlocking | linkage part, (B) is the partial front view of an interlocking | linkage part similarly. 6A is a sectional view taken along line AA in FIG. 6B, FIG. 6B is a partially enlarged view of FIG. 6A, and FIG. 10C is a sectional view taken along line BB in FIG. (A) is a side view for showing movement, (B) is a separated side view showing the relationship between the flip-up rotation fulcrum and the pushing position of the support stay. (A) (B) is the isolation | separation perspective view which shows the connection structure of a movable base body, (C) is a perspective view of a lower cap. (A) is the isolation | separation perspective view which shows the connection structure of a movable base body, (B) is the plane sectional view cut | disconnected by the rotating shaft center. (A) and (C) are isolation | separation perspective views, (B) is a perspective view of a lower bush. (A) is AA sectional view taken on the line of FIG. 10, (B) is a fragmentary sectional view of the state before screwing down a screw. It is a figure which shows the attachment procedure of a movable base body. It is a perspective view of an embodiment applied to a swivel chair.

(1). Outline of Chair Next, an embodiment of the present invention will be described with reference to the drawings. First, an outline of the chair will be described mainly based on FIGS. In the following description, the words “front and rear” and “left and right” are used to specify the direction, but the front and rear and left and right are based on a state viewed from a person who normally sits on a chair. The front view direction is the direction facing the seated person.

  As shown in FIG. 1, the chair includes a leg device 1, a seat 2, and a backrest 3 as large elements, and the seat 2 is attached to a flip-up movable base body 4. Therefore, the seat portion 5 is configured with the seat 2 and the movable base body 4 as main elements. The movable base body 4 is an example of a seat receiving body described in the claims.

  As shown in FIG. 1A, the seat 2 includes a resin seat plate (seat inner shell) 6 and a seat cushion material 7 stretched on the upper surface thereof. Covered with material 8. The movable base body 4 can also be called a pivoting base or a flip-up base. As shown in FIGS. 2 to 4, a large number of reinforcing ribs 9 are provided on the upper surface of the movable base body 4.

  The leg device 1 is made of a metal pipe such as a steel pipe or an aluminum pipe (therefore, this embodiment is applied to a so-called pipe chair), and has four legs having left and right front legs 10 and left and right rear legs 11. It is a method. Casters 12 are attached to the front and rear legs. At the upper end of the front foot 10, an upper side portion 14 extending rearward in a posture slightly tilted forward with respect to the horizontal is formed by bending, and the rear end of the upper side portion 14 is butted against a portion near the upper end of the rear foot 11 and welded. It is fixed with.

  The front ends of the left and right upper side portions 14 are connected by a laterally long horizontal hook 15. The recumbent rod 15 also has a function of supporting the movable base body 4 (seat portion 5) that is tilted forward, and is bent gently in an upwardly convex shape in front view so that the left and right intermediate portions are higher. The rear foot 11 is in a forward leaning posture in a side view so as to be shifted toward the front as it goes upward, and is curved with a gentle curvature. As shown in FIG. 1B, a recess 4 a is formed on the lower surface of the movable base body 4 in which the left and right intermediate portions of the horizontal bar 15 are fitted.

  The upper end of the rear foot 11 is a free end, and the upper support shaft 17 whose axis is horizontally horizontal is fixed to the upper end by welding, and the backrest 3 is attached to the upper support shaft 17 via the upper screw 18 in the rear. It is connected so that it can tilt. Therefore, in the present embodiment, the upper end portion of the rear foot 11 is a support frame 19 as an example of a support member for attaching the backrest 3 and the seat 2. As described above, since the rear foot 11 is tilted forward in a side view, the upper support shaft 17 is positioned in front of the rear end of the seat 2.

  The left-right distance between the left and right hind legs 11 is larger than the left-right distance between the left and right front legs 10, so that the legs of the front and rear chairs can be fitted together (nested) with the seat 5 flipped up. It has become. For example, as clearly shown in FIG. 3, a stopper 20 is provided on the inner side surface of the rear foot 11 so that the front foot 10 of the rear chair hits (fits) when the chair is nested. The stopper 20 is made of rubber or resin and has a buffer function and a positioning function.

  In addition, the form of the leg apparatus 1 can be set arbitrarily. Needless to say, nesting is also possible by making the distance between the left and right front legs 10 larger than the distance between the left and right rear legs 11. Each of the legs 10 and 11 can be manufactured from a solid bar or an elliptical tube. Of course, an aluminum die-cast product or a resin molded product can also be used.

  For example, as shown in FIG. 3, the movable base body 4 has a shallow box-shaped main body portion 21 that is rectangular in plan view, and an upward arm portion 22 that protrudes upward while spreading outward from the rear portion of the main body portion 21. . The movable base body 4 is a resin molded product (may be an aluminum die cast product), and the upward arm portion 22 is provided integrally with the main body portion 21. In addition, since the main-body part 21 is box-shaped, the outer periphery is comprised with the surrounding wall.

  The upward arm portion 22 is basically a plate-like shape that is wide in the front-rear direction, but the front-rear interval is narrowed as it goes upward, and a bearing portion (bearing portion) 23 that protrudes left and right outwards is integrally provided at the upper end. The bearing portion 23 is connected to the upper and lower middle portions of the support frame 19 by a lower support shaft 24, a lower bush 25, and a lower screw 26 so as to be rotatable. The lower support shaft 24 corresponds to the support shaft described in the claims.

  The movable base body 4 can be flipped up and pivoted about the axis 27 of the bearing portion 23. Thereby, the seat part 5 will be in the state flipped up (folded) like FIG. 1 (B). The center of gravity of the seat portion 5 is located behind the axis 27 of the bearing portion 23 and the lower support shaft 24 in a state where the seat portion 5 is flipped up. The lower support shaft 24 is fixed to the support frame 19 by welding. The head of the lower screw 26 is covered with a lower cap 28.

  As shown in FIG. 1 (C), the backrest 3 includes a backrest main body (main frame) 29 having a large opening in the front-rear direction, and a support body 30 attached to the backrest main body 29 so as to cover the opening. Yes. Although the back cushion material 31 is stretched on the front surface of the support body 30, the support body 30 may be left exposed without providing the back cushion material 31. The backrest body 29 and the support body 30 are resin molded products.

  An outward projecting portion 29a projecting outward in the left and right directions is formed in a lower portion of the backrest body 29, and a bearing portion 32 that fits the upper support shaft 17 is formed at the outer end of the outward projecting portion 29a. doing. A bush (not shown) is fitted to the bearing portion 32, and the backrest body 29 is held on the upper support shaft 17 so as not to be detached by screwing the upper screw 18 into the upper support shaft 17 from the inside. The head of the upper screw 18 is covered with an upper cap 33. The outward projecting portion 29a protrudes forward in plan view, and therefore the backrest 3 surrounds the seated person's waist from behind.

  When the backrest 3 is viewed in a longitudinal side view, the backrest main body 29 is bent so that the portion of the height position where the outwardly projecting portion 29a is provided is located in the foremost position. The height of the outwardly projecting portion 29a is set to the height of the lumbar region (especially around the third lumbar vertebra) when an average adult is seated. For this reason, the backrest 3 has a lumbar support function.

  The opening of the backrest main body 29 and the support body 30 form a front view form in which the lower part is rounded and is entirely constricted upward. Except for the peripheral edge portion of the support body 30, a large number of holes are opened side by side in the vertical and horizontal directions. For this reason, it has a lattice-like appearance in which a large number of vertical and horizontal lines cross each other. The peripheral portion of the support body 30 is fitted into the backrest body 29 and attached.

  Needless to say, it is also possible to attach the back cushion material 31 directly or via an inner member to the backrest body 29 as a configuration in which the backrest body 29 is not opened in the front-rear direction. Further, instead of the resin support body 30, a flexible mesh material can be stretched on the backrest main body 29. When the resin-made support body 30 is provided, various modes such as a mode in which horizontally long slits are formed in multiple stages can be adopted. The backrest 3 can also be composed of only the backrest body 29.

  When the backrest 3 tilts backward, the seat 2 moves forward. Therefore, the seat 2 is attached to the movable base body 4 so as to be slidable back and forth. Specifically, as shown in FIGS. 2 to 4, a pair of left and right sliders 36 are mounted on the movable base body 4 so as to be movable back and forth, and a seat plate 6 is mounted on the left and right sliders 36 so as not to be movable relative to the front and rear. Accordingly, the seat 2 moves relative to the slider 36. As shown in FIG. 4, the forward movement of the slider 36 is elastically supported by a spring 37 (compression coil spring) as an example of an elastic support means. The spring 37 is supported by front and rear spring receivers 38, 39. The front spring receiver 38 is held by the movable base body 4 so as not to move forward and backward, and the rear spring receiver 39 is pushed by the slider 36 and moves forward.

  Further, left and right horizontally long support stays 40 made of metal plates are fixed to the rear end portions 36 c of the left and right sliders 36 with screws 41, and upward passive arms 42 are bent at the left and right end portions of the support stay 40. On the other hand, a pocket-like pushing portion (holder portion) 43 that fits on the passive arm 42 of the support stay 40 from above is provided at the lower end portion of the backrest body 29.

  A resin crown member 44 is attached to the upper end of the passive arm 42 as a passive portion. The crown member 44 is for dispersing the reaction force to the pushing portion 43 and smoothing the movement. For example, as shown in FIG. 5, the fixed portion of the slider 36 in the support stay 40 is an upward bulging portion 40a, and the protruding piece 36c of the slider 36 is fixed to a stepped portion 40b formed in the upward bulging portion 40a. doing.

  In the chair of the present embodiment, when the backrest 3 is locked by the seated person's leaning, the slider 36 moves forward via the support stay 40, whereby the seat 2 is synchronized (synchronized) with the locking of the backrest 3. Advance.

  Therefore, although the chair of this embodiment is a chair that can be nested, the seat 2 moves forward in conjunction with the locking of the backrest 3. Since the slider 36 is biased in the backward direction by the spring 37, it is sufficient for the pushing portion 43 to have a function of pushing the passive arm 42. Therefore, for example, the backrest body 29 of the backrest body 29 is not formed in a pocket shape. It is also possible to function as the pushing portion 43 by thickening a part of the lower portion. In the present embodiment, the pushing portion 43 and the passive arm 42 of the support stay 40 constitute interlocking means. The seat 2 is attached to the slider 36 and the support stay 42 (the attachment structure will be described later).

  For example, as shown in FIG. 5, the slider 36 has a groove shape with a longitudinal front and a downward opening, and an outward front and rear flange 36 b is bent at the lower end of the left and right side plates 36 a. On the other hand, a pair of front and rear support protrusions 45 that the slider 36 covers are provided on the left and right side portions of the movable base body 4, and a roller 46 that is disposed on the upper end of the support protrusion 45 with the shaft center acting horizontally long can freely roll. It is inserted. The roller 46 is made of a resin having a small friction coefficient such as POM resin, and the slider 36 can be slid back and forth lightly and silently. Two long slot holes 52 are formed on the upper surface of the slider 36, and a claw provided on the front spring receiver 38 is fitted into the long slot hole.

  The horizontal displacement of the slider 36 is regulated by an outer guide wall 47 provided on the movable base body 4 and front and rear inner guide protrusions 48. A guide stopper 49 is provided on the outer guide wall 47 and the front and rear inner guide protrusions 48 so as to be positioned on the front and rear flanges 36 b of the slider 36. For this reason, the slider 36 is held so as to be slidable back and forth without being movable upward. While there is a large space between the front and rear flanges 36b of the slider 36, there is also a large space between the front and rear guide stoppers 49.

(2). Seat Pushing Mechanism Next, the seat pushing mechanism accompanying locking will be described mainly with reference to FIGS. As shown in FIGS. 6 and 7, the resin-made crown member 44 is attached to the upper end of the passive arm 42 in the support stay 40 as described above. The crown member 44 is a passive portion that receives the pressing force of the backrest 4 and has a substantially circular shape in a side view, and is provided with a downward opening groove 75 into which the upper end of the passive arm 42 is fitted.

  Although the upper end of the passive arm 42 is also formed in a substantially arc shape in a side view, an engagement step portion 76 is formed on the front side and a notch 77 is formed on the rear side. A head 42a with a neck is formed at the upper end of the head. The crown member 44 is formed with a claw portion 44a that fits into the engagement stage of the passive arm 42. For this reason, the crown member 44 is held on the passive arm 42 so that it cannot be detached without rattling.

  The pushing portion 43 of the backrest body 29 is formed in a pocket shape as described above, and the left and right side plates 43a, the top plate 43b connected to the upper ends of the left and right side plates, and the upper and lower sides connected to the inside of the left and right side plates 43a as a pair. And a longitudinal middle plate 43c. An inward front rib 43d is formed at the front end of the left right plate 43a, and the interval between the front ribs 43d is set to a dimension that allows the passive arm 42 to pass but the crown member 44 does not come out. The head 42a and the crown member 44 of the passive arm 42 are located between the front rib 43d and the middle plate 43c, and the passive arm 42 is pushed by the middle plate 43c via the crown member 44. The seat 2 moves forward in conjunction with the locking.

  As shown in FIG. 8, the backrest 3 rotates in the direction of the arrow 79 around the shaft center 78 of the upper support shaft 17, and by this rotation, the pushing portion 43 moves forward while descending. On the other hand, the support stay 40 only moves forward. Therefore, when the crown member 44 moves upward relative to the inside of the pushing portion 43 (by increasing the position of pushing the crown member 44 by the intermediate plate 43c), the forward movement of the seat 2 due to locking is permitted. Yes. When the body pressure acting on the backrest 3 is released, the support stay 40 is retracted by the spring 37, and then the pushing portion 43 is pushed by the crown member 44, and the backrest 3 returns and rotates.

(3). Connection structure of movable base body Next, the connection structure of the movable base body 4 will be described mainly with reference to FIGS. As shown in FIGS. 9 to 11, the bearing portion 23 of the movable base body 4 is formed with an outward hole 89 and an inward hole 90 with an intermediate wall 88 interposed therebetween, and the lower bush 25 is formed in the outward hole 89. Is fitted from the outside.

  The outward hole 89 has a substantially horseshoe shape with a circular arc when viewed from the side, and the inner end portion 25a of the lower bush 25 is fitted to the inner end portion 25a so as not to be relatively rotatable. The lower bush 25 has a downward projecting portion 25b located outside the inner end portion 25a, and a thick portion 25c located outside the downward projecting portion 25b and surrounding the lower half circumference. Both ends of the thick portion 25c are upwardly stepped surfaces.

  On the other hand, the bearing portion 23 of the movable base body 4 has an inverted U-shaped dome portion 23a that surrounds the lower bush 25 from the left and right sides, and the left and right side plates of the dome portion 23a are cut at a portion below the axis. By notching (the notch is indicated by reference numeral 23 d), a stepped portion 23 b that overlaps the thick portion 25 c of the lower bush 25 from above is formed. Accordingly, the thick portion 25c of the lower bush 25 is substantially flush with the outer periphery of the bearing portion 23, and has a cylindrical shape as a whole. The inside of the lower bush 25 is basically circular, and the lower support shaft 24 is fitted into this. The dome portion 23 a protrudes outside the outer end of the outward hole 89. Accordingly, the dome portion 23a opens downward.

  The lower screw 26 is screwed into the lower support shaft 24 from the inside. The lower screw 26 includes a flat washer 91 that overlaps the bottom surface of the inward hole 90, a collar 92 that has a flange that overlaps the seat surface of the lower screw 26, and Two plate-type spring washers 93 positioned between the flat washer 91 and the flange of the collar 92 are fitted. The bearing 23 is attached to the lower support shaft 24 by screwing the lower screw 26 in a state in which the flat spring washer 93 is flattened and deformed. The two plate-shaped washers 93 are arranged in a reverse orientation so that the concave portions face each other (the concave portion may be oriented in the reverse direction). The outward hole 90 is closed by a front and rear slide type lower cap 28. Three or more dish-type washers 93 may be used.

  When the collar 92 is stretched against the bottom surface of the hole of the lower support shaft 24, the screwing depth of the lower screw 26 is restricted. In this state, the bearing portion 23 is not completely tightened and the spring washer 93 is slightly crushed and deformed. There is still room to be done. For this reason, the movable base body 4 can be rotated around the axis 27 of the lower support shaft 24. Further, since the elastic deformation force of the spring washer 93 acts as a resistance against the rotation of the movable base body 4, the seat portion 5 in the state of being flipped up by using an inexpensive spring washer 93 is vibrated. It can prevent falling and turning.

  Furthermore, the downwardly protruding portion 25b of the lower bush 25 is integrally provided with a front and rear longitudinal spring piece portion 25d, and an engaging protrusion (elastic engagement portion) 25e is formed at the front and rear intermediate portion of the spring piece portion 25d. The lower bush 25 is formed with two engagement grooves 94 that selectively fit into the engagement protrusions 25e of the spring piece 25d in the state where the seat portion 5 is tilted and raised. The space below the spring piece portion 25d is a space. Therefore, the spring piece portion 25d is allowed to bend and deform to allow the engagement protrusion 25e to escape from the lower bush 25.

  Further, when the engagement protrusion 25e is fitted into the engagement groove 94, a clicking sound is made or the fit is found by touch. That is, when the seat portion 5 is jumped up or down to a predetermined posture, the person can obtain a click feeling. Therefore, it is possible to grasp that the predetermined posture has been reached, and it is user friendly. The engagement protrusion 25e and the engagement groove 94 are an example of a posture holding means for the seat portion 5. As the posture holding means, for example, a ball catch using an elastic body such as a spring or rubber and a ball, etc. Various methods can be adopted.

  As shown in FIG. 13, the movable base body 4 is attached by fitting the bearing portion 23 onto the lower support shaft from above. The lower bush 25 is fitted in the lower support shaft 24 in advance. In this attachment, the lower bush 25 and the bearing portion 23 are fitted in the left-right direction by the depth dimension E of the outward hole 89 as shown in FIG. 10, but the upward arm portion 22 of the movable base body 4. Therefore, when the movable base body 4 is pushed downward with a certain amount of force, the bearing portion 23 is once deformed to escape inward, and then is pushed back and deformed at the same time, and the bearing portion 23 is lowered. The bush 25 is fitted.

  In this case, since the dome portion 23a of the bearing portion 23 protrudes outward, positioning in the front-rear direction is automatically performed when the bearing portion 23 is fitted into the lower bush 25. For this reason, attachment can be performed quickly and accurately. As shown in FIG. 10, a portion of the bearing portion 23 below the outward hole 89 is an inclined surface 23 c that is lowered toward the inside, and the outer surface of the tip portion of the lower bush 25 is chamfered. Since the inclined surface 25f is formed, the bearing portion 23 is reliably guided into the lower bush 25. This is one of the advantages of this embodiment.

  As described above, the lower bush 25 and the bearing portion 23 are fitted in the left-right direction by the depth dimension E of the outward hole 89 as shown in FIG. When the upper arm portion 22 of the movable base body 4 is pushed downward, the upper arm portion 22 of the movable base body 4 is once bent and deformed, so that the lower end portion of the bearing portion 23 descends over the inclined surface 25f of the lower bush 25 and is pushed in completely. At the same time, the upward arm portion 22 is returned and deformed, and the bearing portion 23 is fitted into the lower bush 25, so that the movable base body 4 is held so that it cannot be pulled out.

(9). Other Embodiments / Others FIG. 14 shows an example applied to a swivel chair. In this example, left and right support frames 19 are provided on an elevating base 97 provided at the upper end of a leg column 96 made of a gas cylinder, and the backrest 3 and the movable base 4 are rotatably connected to the support frame 98. . The connection structure between the backrest 3 and the movable base 4 is the same as that of the above-described embodiment. The leg device 1 has two branch legs 101 and 102 each having a different mounting position with respect to the leg tube 99. For this reason, if the seat part 5 is flipped up, it can nest back and forth.

  The present invention can be embodied in various ways other than the above-described embodiment. For example, the bearing portion may project inward from the support frame, and the support shaft may project outward from the upward arm portion. In this case, the support shaft may be fitted from above by notching the bearing portion of the support frame upward. In this case, the notch of the bearing portion opens upward, but this may be covered with a cap.

  The cited document can also be applied to a chair that does not move forward. In this case, the seat receiver may be provided on a seat plate (shell body) constituting the seat, or a seat receiver may be provided separately from the seat and provided on the seat receiver. Moreover, the elastic fastening structure using elastic members, such as a disk-type spring washer, is applicable also to another site | part, and may be an independent invention.

  The present invention can be manufactured as a chair. Therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Leg apparatus 2 Seat 3 Backrest 4 Movable base body as an example of seat receiving body 11 Rear leg of leg apparatus 17 Upper support shaft 19 Support frame as an example of support member 21 Main body portion of movable base body 23 Bearing of movable base body Part 23a Notched downwardly, Dome part 23d Notched 22 Upward arm part provided on movable base body 24 Lower support shaft (support shaft)
25 Lower bush 25e Engagement protrusion (elastic engagement part)
DESCRIPTION OF SYMBOLS 29 Backrest main body 32 Bearing part of backrest main body 36 Slider 40 Support stay 42 Passive arm 43 Pushing part 88 Middle wall 93 Countersunk spring washer as an example of elastic member 94 Engaging groove

Claims (6)

Comprising a seat and a support frame disposed on the left and right outside of the rear portion, and is configured to be coupled to the support frame so that the seat body can be flipped up and rotated,
An upward arm portion projecting above the seat surface is integrally provided at the rear portion of the seat or the seat receiving body to which the seat is attached, and the upper end portion of the upward arm portion is formed by a pair of a support shaft and a bearing portion that are fitted to each other. Connected to the support frame,
Chair. An inward support shaft is fixed to the support frame, while the upward arm portion is provided with a bearing portion, and the bearing portion can be fitted into the support shaft by moving the bearing portion downward. Has a downward notch,
The chair according to claim 1. The support shaft is made of metal, and a resin bush is interposed between the support shaft and the bearing portion.
The chair according to claim 1 or 2. The bush is held on the bearing portion so as not to be relatively rotatable, and an engagement groove is formed on the outer periphery of the support shaft. On the other hand, the bush is fitted into the engagement groove in a state where the seat is flipped up. An elastic engagement portion is provided,
The chair according to claim 3. The bearing portion includes an intermediate wall that overlaps the end surface of the support shaft, and the intermediate wall is pressed and held on the end surface of the support shaft by a screw through an elastic member.
The chair as described in any one of Claims 1-4. The elastic member is a disc-type spring washer, and two disc-type spring washers are reversed and overlapped,
The chair according to claim 5.

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