JP2010213816A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backrest structure of a chair capable of easily detachably, stably and surely attaching a cushion body to the front surface of a back frame without generating displacement or the like. <P>SOLUTION: In the backrest structure of the chair composed by attaching a back plate 42 having the cushion body 40 mounted on the front surface, to the front surface of the back frame 39 composed by connecting the upper end parts of a pair of right and left vertical rods 46 and 46 with each other and opposing parts below them with each other respectively by horizontal rods 47, an engaging hole 69 provided at the upper end part of the back plate 42 is locked to a locking piece 55 provided at the upper end part of the back frame 39, the horizontal rod 47 is fitted to a recessed groove 70 provided in a part at the rear surface of the back plate 42 facing the horizontal rod 47, and the horizontal rod 47 is fixed to the back plate 42 with a fixing screw 72. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a chair backrest structure.

  For chairs used in railway vehicles and aircraft cabins, the upper end of a rectangular frame-like backrest frame is hooked with the upper end of the backrest body, and the lower end of the backrest body Is inserted between the lower frame of the back support frame and the hook fixed thereto, and the flexible part at the lower end of the back support body is wound around the back support frame and further flexible with an adhesive cloth (surface fastener). There is one in which the back support body can be attached to and detached from the back support frame by attaching the portion to the back support frame (see, for example, Patent Document 1).

Japanese Patent No. 3771387

  However, in the invention described in Patent Document 1, the upper hook portion of the backrest body is hooked on the upper end portion of the backrest frame, and the lower end portion of the backrest body is connected to the lower frame of the backrest frame. And the hook fixed to it, and then the flexible part at the lower end of the back support body is wrapped around the back support frame, and the flexible part is attached to the back support frame with an adhesive cloth. In addition, the work of attaching the backrest body to the backrest frame and the work of detaching the backrest body in the reverse procedure to the above are complicated, and the backrest body is particularly suitable for the upper latching part and the lower end part. There is a possibility that the bending portion may be displaced with respect to the backrest frame or rattle, and there is a problem that it is difficult to stably support the backrest body.

  In view of the above-described problems, the present invention enables the cushion body to be easily attached to and removed from the front surface of the back frame, and can be stably and reliably attached without causing a positional shift or the like. It is intended to provide a chair backrest structure.

According to the present invention, the above problem is solved as follows.
(1) The cushion body is mounted on the front surface of the back frame formed by connecting the upper ends of the pair of left and right vertical saddles and the opposing portions below them with horizontal reeds facing left and right. In the backrest structure of the chair to which the back plate is attached, the locked portion provided at the upper end portion of the back plate is locked to the locking member provided at the upper end portion of the back frame, and the rear surface of the back plate The recumbent groove is fitted in a groove provided in a portion facing the recumbent body, and the recumbent body is fastened to the back plate by fastening means.

With such a configuration, with the back plate tilted backward from the front of the back frame, the locked portion at the upper end of the back plate is locked to the locking member at the upper end of the back frame, Rotate the lower end of the back plate to the rear, fit the recessed groove of the back plate to the recumbent of the back frame, and then fasten the recumbent to the back plate, The cushion body can be easily detached from the back frame in the reverse procedure to the above.
In addition, after the cushion body is attached to the back frame, the engagement between the locked portion of the back plate and the locking member of the back frame, and the fitting between the concave groove of the back plate and the horizontal frame of the back frame, The cushion body is stably and securely supported by the back frame without any positional displacement or rattling by the fixing of the recumbency to the back plate.

  (2) In the above item (1), the locking member is a rear-facing hook-shaped locking piece provided on the upper surface of the uppermost horizontal bar, and the locked portion is the rearward at the upper end of the back plate. An engagement hole is provided in the piece, and the rear edge of the engagement hole is engaged with the engagement piece.

  With such a configuration, the structure of the locking member of the back frame and the locked portion of the back plate can be simplified, and they can be easily engaged with each other.

  (3) In the above item (1) or (2), a screw hole is provided in the back end face of the concave groove in the back plate, and a set screw that faces the front-rear direction, which is a fastening means that penetrates a horizontal gutter in this screw hole Fasten the screw to the back plate by tightening.

  With such a configuration, the structure of the fastening means can be simplified, and the set screw can be tightened by screwing it into the screw hole of the back plate, so that the fit between the horizontal gutter and the concave groove can be made tighter. The shape of the cushion body can be stabilized.

  (4) In any one of the above items (1) to (3), an attachment plate for attaching a decorative plate that covers the rear surface of the back frame is engaged with an engaging piece provided on the front surface of the mounting frame on the recumbent in the back frame. By attaching it to the back frame, attach it to the back frame.

  With such a configuration, the mounting plate can be securely attached using the recumbent of the back frame, and the decorative plate on the backrest, which is most easily damaged, can be easily used by using this mounting plate. Can be replaced.

  According to the present invention, there is provided a chair backrest structure in which a cushion body can be easily attached to and detached from the front surface of a back frame, and can be securely and securely attached without causing a positional shift or the like. be able to.

1 is an external perspective view of a two-seat chair for a vehicle including an embodiment of the present invention. Similarly, it is an exploded perspective view. It is the disassembled perspective view which looked at one side plate from the inside. It is a partially notched side view which fractures | ruptures and shows the upper part of one side plate. It is a center longitudinal cross-sectional side view which fractures | ruptures and shows a part of intermediate part armrest when an intermediate part armrest is made into a use position. It is a center vertical side view which fractures | ruptures and shows a part of intermediate part armrest when an intermediate part armrest is made into a non-use position. It is a disassembled perspective view of one backrest. It is a disassembled perspective view of the other backrest. It is a center vertical side view of one backrest which omitted a folding table etc.

Next, the chair provided with one Embodiment of this invention is demonstrated with reference to FIGS.
1 and 2 show an example in which the present invention is applied to a two-seat chair for a vehicle, and is a plan view fixed on a turntable (not shown) that rotates horizontally provided on the floor of the vehicle. On a horizontal rectangular base frame 1 (FIG. 2), a pair of left and right seats 2 and 2, a pair of left and right backrests 3 and 3 that can be tilted rearwardly behind each seat 2, and the outside of each seat 2 It can be rotated between a pair of left and right side plates 4 and 4 made of aluminum die-casting and left and right backrests 3 and 3 between a use position facing forward and a non-use position facing upward. It consists of an intermediate armrest 5 attached.

  As shown in FIG. 2, the base frame 1 includes a connecting rod 7 that faces both sides of a pair of front and rear horizontal cages 6, 6 made of a square tube that faces in the left-right direction, and two middle portions. 7, 8, 8 are connected to each other, and a total of four upright members 9 facing the front oblique upper side are fixed to the two sides of the front side 6 and the middle part. A total of four upright members 10 facing right above are fixed to the two portions of both sides of the 6 and the intermediate portion.

As shown in FIG. 5, each upright member 9 includes a front piece 9 a that faces obliquely upward in front, side pieces 9 b and 9 b that face rearward from both side edges, an upper horizontal piece 9 c that is welded to the inside, and a lower part A horizontal piece 9d and an inclined piece 9e that connects both of them are provided.
A side-view inverted V-shaped notch 11 is provided at the lower end of each of the side pieces 9b, 9b, and this notch 11 is formed at the corner between the upper surface and the front surface of the front reed 6 comprising a square tube. By pushing and screwing the lower horizontal piece 9d to the upper surface of the horizontal bar 6, each upright member 9 is easily and firmly fixed to the horizontal bar 6 so as to face obliquely upward. ing.

  Each of the upright members 10 is firmly fixed to the upper surface of the rear side cage 6 so as to face directly above.

  At the upper ends of the left and right upright standing members 9 and 9 and the rear left and right upright standing members 10 and 10, a pair of left and right seat receiving frames 12 and 12 that form a substantially rectangular frame shape in plan view Each corner is placed and fixed with bolts 13 in the vertical direction.

  An elastically bendable tension member 14 is stretched on the upper surface of each seat receiving frame 12 by fastening each edge to the upper surface of the seat receiving frame 12 with a pressing plate 15. The upholstery material 14 can be, for example, a net, a cloth, a surface spring, or the like.

On the upper surface of each seat receiving frame 12 on which the upholstery material 14 is stretched, a seat 2 formed by enclosing a cushion body (not shown) with a skin material 16 has a front portion forward of the seat receiving frame 12 and the base frame 1. It is placed so as to protrude.
As described above, by placing the seat 2 on the seat receiving frame 12 provided with the upholstery material 14, the cushioning property of the central portion of the seat 2 can be maintained even if the seat 2 is thinned.

  A front cover plate in which a front surface of the base frame 1, the upright member 9, and the seat receiving frame 12 is provided with a seat receiving piece 17 b facing forward at a top end of an inclined piece 17 a extending obliquely upward in the front direction. 17 is disposed over substantially the entire length of the base frame 1 in the left-right direction, and the lower surface of the front portion of the seat 2 is supported by the seat receiving piece 17b.

A plurality of brackets 17c having rear pieces are fixed to an intermediate portion in the vertical direction on the rear surface of the inclined piece 17a and corresponding to each upright member 9.
The rear piece of the bracket 17c is fastened to the upper part or the middle part of each upright member 9 with a shaft 17d facing left and right, and the lower end part of the front cover plate 17 is brought into contact with the front surface of the base frame 1. Thus, the front cover plate 17 can be easily and reliably attached to the base frame 1, and the front lower surface of the seat 2 can be stably supported by the seat receiving piece 17 b.

  Further, since the seat 2 is supported at a position higher than the base frame 1 by the plurality of upright members 9 and 10 and the seat receiving frame 12 provided on the upper surface of the base frame 1, a gas spring, which will be described later, is provided below the seat 2. A large accommodation space for 51 and others can be secured.

  The upper end portion of the drooping cloth 18 is sewn on the lower surface of the front portion of each seat 2, and the drooping cloth 18 is folded backward from the front end of the seat receiving piece 17 b in the front cover plate 17, and the free end portion is The front portion of the seat 2 and the front cover plate 17 are detachably coupled by being fastened to the lower surface of the seat receiving piece 17b with the hook and loop fastener 18a.

  Although not shown in the figure, the free end portion of the one similar to the hanging cloth 18 sewn on the inner side lower surface of one seat 2 is placed on the inner side lower surface of the adjacent seat 2. The left and right seats 2 and 2 are joined together by fastening with a hook-and-loop fastener.

  On the rear surfaces of the base frame 1, the standing members 10, and the seat receiving frames 12, a rear cover plate 19 having a U-shape in a front view is provided, and a plurality of brackets 19 a provided on the front surface thereof are attached to each of the standing members 10. By being fastened, like the front cover plate 17, the base frame 1 is attached over almost the entire length in the left-right direction.

  As shown in FIGS. 1 to 4, each side plate 4 fixed to both side surfaces of the base frame 1 stands from the base portion 20 that covers the side surfaces of the base frame 1 and the seat 2, and the rear portion, and the backrest when standing up An aluminum die-cast aluminum die-casting having a substantially U-shape in side view, integrally formed with an upright portion 21 covering the lower portion of the outer side surface 3 and an elbow rest support portion 23 in an armrest 22 facing forward from the upper end of the upright portion 21. It consists of a molded body.

The elbow rest support portion 23 has an approximately V-shaped cross section and faces forward, and a substantially flat elbow rest member 24 facing in the front-rear direction is provided in the opening at the upper end thereof. It is attached to block the part.
An armrest 22 is formed by the armrest support portion 23 and the armrest member 24.

  An operation lever 26 in which a handle portion 26a protrudes forward from a window hole 25 provided in the front end surface of the elbow rest member 24 is pivoted on a front portion of the lower surface of the elbow rest member 24 with a pivot 27 directed in the left-right direction. It is worn.

  By rotating the handle portion 26a of the operation lever 26 upward, the flexibility inserted into the flexible outer tube 28a of the Bowden cable 28 linked to the operation lever 26 so as to be slidable in the axial direction. The inner cable 28b is pulled, so that a gas spring 51 for adjusting the rearward tilt angle of the backrest 3 described later can be operated.

  As shown in FIGS. 3 and 4, the front lower edge of the base portion 20 of each side plate 4 has an inwardly inclined edge piece 20a parallel to the inclined piece 17a and the seat receiving piece 17b of the front cover plate 17 and a horizontal line. An edge piece 20b is formed, and the inclined piece 17a of the front cover plate 17 is brought into contact with the rear surface of the inclined edge piece 20a, and the seat receiving piece 17b of the front cover plate 17 is brought into contact with the upper surface of the horizontal edge piece 20b. In addition, by screwing the seat receiving piece 17b to the horizontal edge piece 20b, the end portion of the front cover plate 17 is shaped by the side plate 4, and the end portion of the front cover plate 17 is dropped from the side plate 4. And it can be held securely.

As shown in FIGS. 2, 5, and 6, the front surface of the lower end portion of the armrest strut 29 facing upward is fixed to the rear surface of the center portion in the left-right direction of the back ridge 6 in the base frame 1. An intermediate armrest 5 is pivotally attached to the upper end portion of the armrest support 29 with a shaft 30 facing in the left-right direction.
As shown in FIG. 1, the armrest strut 29 and the intermediate armrest 5 are disposed so as to be sandwiched between the left and right backrests 3 and 3.

As shown in FIG. 5, the intermediate armrest 5 has a rear end of an adjustment bolt 32 with a lock nut provided on the front wall of the recess 31 provided on the lower surface of the rear end portion, abutting against the front surface of the armrest column 29, As shown in FIG. 6, it rotates around the shaft 30 from the use position facing substantially forward to the non-use position facing almost upward (in the example shown in FIG. 6, the direction slightly tilted backward from above). It is possible to move.
By adjusting the amount of protrusion of the adjustment bolt 32 from the front wall of the recess 31 to the rear, the inclination angle of the intermediate armrest 5 at the non-use position can be adjusted.

As shown in FIG. 5, on the lower surface of the rear part of the intermediate armrest 5, there is an upper portion of a flexible covering piece 33 that covers the front surface of the pivoting portion of the intermediate armrest 5 when the intermediate armrest 5 is not in use. Is fixed with a fixing screw 34.
The covering piece 33 is preferably formed of a stainless plate, a synthetic resin plate, or other elastically bendable plate piece having a good appearance. Further, the upper portion of the covering piece 33 covers the lower surface of the recess 31 provided with the adjusting bolt 32 and the screwing portion 36 for fixing the elbow rest member 35 to the upper surface of the intermediate armrest 5 from below. It is preferable to do this.

  On the front surface of the armrest support 29, there is a bag-shaped receiving portion 37 having an open upper end that gradually receives from the lower end portion of the cover piece 33 toward the upper portion when the intermediate armrest 5 is rotated from the non-use position to the use position. Is provided.

  In the illustrated example, the receiving portion 37 includes a front piece 38 a in a U-shaped cover member 38 in a backward U-shape in plan view in which side pieces 38 b facing rearward from both side edges of the front piece 38 a are connected to the armrest column 29. It is formed by fixing both side pieces 38b, 38b to both side surfaces of the armrest strut 29 so as to be spaced forward from the front surface.

  As shown in FIG. 5, when the intermediate armrest 5 is located at the use position, the cover piece 33 has the lower end rear surface in contact with the front surface of the armrest support 29 and the upper portion is elastically bent forward. However, when the intermediate armrest 5 is rotated from the use position to the non-use position, the cover piece 33 is pulled upward from the receiving portion 37 while the upper portion that is elastically bent forward is gradually returned to the plane, When the intermediate armrest 5 reaches the non-use position, as shown in FIG. 6, the covering piece 33 is substantially vertical, or the upper part is slightly elastically bent backward, and is pivotally attached from the lower part of the intermediate armrest 5. Covering the front of the part, only the lower end remains in the receiving part 37.

  In this state, the front surface of the pivoting portion of the intermediate armrest 5, the concave portion 31, the screwing portion 36, and the like is covered with the covering piece 33 and is not exposed forward, so that the appearance is good.

When the intermediate armrest 5 is rotated from the non-use position to the use position, the cover piece 33 gradually descends at the lower end portion and enters deeply into the receiving portion 37, while the upper portion is together with the intermediate armrest 5. The elastic body is gradually bent forward, and the lower part is pressed against the front surface of the armrest support 29.
At this time, since the front lower part of the pivot part of the intermediate armrest 5 and the opening part of the recess 31 is covered with the covering piece 33, the clothes of the seated person enter the pivot part and the recess 31. It is blocked and clothes or the like can be prevented from being pinched between the intermediate armrest 5 and the armrest support 29.

  In the illustrated example, the armrests 22 on both sides are provided integrally with the side plate 4, but the armrests 22 on both sides are pivoted on the upper end of the upright portion 21 of the side plate 4 with a left and right axis (not shown). When wearing and turning upward like the intermediate armrest 5, the covering pieces 33 and the receiving portions 37 are provided on the armrests 22 on both sides and the upright portions 21 of the side plates 4. It is good.

  As shown in FIG. 2 and FIGS. 7 to 9, each of the left and right backrests 3 is attached to the front surface of the back frame 39 with a back plate 42 having a cushion body 40 and a skin material 41 covering the cushion body 40 mounted on the front surface. In addition, a decorative plate 45 is attached to the rear surface of the back frame 39 via a pair of upper and lower attachment plates 43 and 44.

  The back frame 39 has a pair of left and right vertical rods 46, 46 having an arc-shaped portion 46 a protruding forward at the upper end portion forming the headrest portion, the upper end portions of both vertical rods 46, 46, slightly above the lower ends. It is made of aluminum die-casting, in which parts and a plurality of intermediate places are respectively connected with a horizontal bar 47 facing in the left-right direction.

  A projection 48 facing forward is provided at a portion slightly above the lower ends of the left and right vertical rods 46 in the back frame 39, and this projection 48 is connected to the middle portion of the upright portion 21 of the side plate 4 and the armrest column 29. By pivotally attaching to the middle portion with a pivot 49 that faces in the left-right direction, the back frame 39 and the entire backrest 3 can be rotated backward from the standing position around the pivot 49.

  A bracket 50 is fixed to the front surface below the protrusion 48 of the vertical rod 46 positioned outside the left and right back frames 39, and a gas spring 51 with a lock function facing the front-rear direction is attached to the bracket 50. The rear end portion is connected with a shaft 52 facing in the left-right direction, the front end portion of the gas spring 51 is connected to both front portions of the base frame 1 with the shaft 53 facing in the left-right direction, and the front end portion of the gas spring 51 is further connected. The reclining mechanism of each backrest 3 is formed by connecting the operation lever 54 provided to the inner cable 28b in the Bowden cable 28.

  As a result, the handle 26a of the operating lever 26 provided at the front end of the armrest 22 is pulled upward, the inner cable 28b is pulled, the operating lever 54 is rotated, and the operating lever 54 pushes the gas spring 51. While the button 51a is being pushed, the gas spring 51 can be expanded and contracted, the backrest 3 can be rotated to a desired rearward tilt angle, and when the hand is released from the handle 26a of the operation lever 26, the push is performed. The button 51a protrudes by the biasing force of the built-in spring, the expansion and contraction of the gas spring 51 is locked, and the backrest 3 is locked at the position where it was stopped immediately before.

  A plurality of (three in this example) locking pieces (locking members) 55 each projecting from the side in a side view are projected from the upper surface of the uppermost horizontal bar 47 of the back frame 39.

  A headrest back plate 56 made of aluminum die-cast having a convex arcuate shape is formed between the uppermost horizontal surface 47 of the back frame 39 and the horizontal surface 47 of the second level from above. A support body 59 that pivotally supports the rotary lever 57 around a shaft 58 that faces in the front-rear direction is attached from the center of the lower end portion to the upper surface of the second stage ridge 47. A notch 60 is provided.

The rotation lever 57 is for holding the folding table 61 provided on the back side of the back frame 39 in the storage position.
The folding table 61 is pivotally attached to the upper ends of a pair of left and right support legs 62, 62 whose lower ends are coaxially attached to the pivot 49 of the back frame 39 with a shaft 63 facing in the left-right direction. 62, the storage position substantially parallel to the back surface of the back frame 39, and the two support legs 62, 62 slightly rearwardly tilted with respect to the back frame 39, further rearward with respect to the both support legs 62, 62. It can be moved to a use position that is tilted and substantially horizontal.

A stopper 64 is provided at the lower end of each of the support legs 62, 62 to restrict the pivot angle of the support legs 62, 62 to the rear, and the folding table 61 is provided at the upper end of the support legs 62, 62. Arc pins 66 are provided to restrict the rotation angle of the folding table 61 with respect to both support legs 62 and 62 by fitting pins 65 projecting at portions away from the shaft 63 at both ends. .
Portions below the circular arc hole 66 at the upper ends of the support legs 62 are connected by a connecting rod 67 that faces in the left-right direction.

  As shown in FIG. 7, the upper end portion forming the headrest portion of the back plate 42 has an arc shape similar to the arc-shaped portion 46a of the vertical rod 46 of the back frame 39, and a rectangular window is formed at the center of the portion. A hole 68 is provided.

  A rearward piece 42 a is provided above the window hole 68 in the back plate 42, and a plurality of engagement holes (continuous to the window hole 68) are formed in a portion corresponding to the locking piece 55 on the front edge of the rearward piece 42 a. A locked portion) 69 is provided.

On the rear surface of the back plate 42, a concave groove 70 facing in the left-right direction is provided in a portion facing the horizontal ridge 47 in the second and lower stages from the top.
It is preferable to weld a nut 71 (FIG. 9) at an appropriate position in front of the concave groove 70 in the back plate 42.

  The back plate 42 with the cushion body 40 and the skin material 41 mounted on the front surface is tilted slightly rearward, and the rear edges of the plurality of engagement holes 69 at the upper end portion are connected to the back frame 39 from the front of the back frame 39. The lower end portion of the back plate 42 is pivoted rearward so that the respective concave grooves 70 on the rear surface are formed on the horizontal rods 47 of the corresponding back frame 39. After that, the back frame 39 can be simply attached to the back frame 39 by screwing and tightening a set screw 72 which is a fastening means and which passes through the horizontal rod 47 from the rear and faces the front and rear direction. Can be installed. Further, the back plate 42 can be easily detached from the back frame 39 by a procedure reverse to the above.

  After the back plate 42 is attached to the back frame 39, the engagement between the rear edge of the engagement hole 69 of the back plate 42 and the locking piece 55 of the back frame 39, the concave groove 70 of the back plate 42 and the back frame 39. The back plate 42 can be stably and securely attached to the back frame 39 without any positional displacement or rattling by fitting the side plate 47 to the back plate 47 and fixing the side plate 47 to the back plate 42. Supported.

  As shown in FIG. 8, an L-shaped reinforcing member 73 and a backward U-shaped reinforcing member 74 in a side view are fixed to the upper and lower front portions of the upper mounting plate 43, and these reinforcing members By attaching 73 and 74 to the rear surfaces of the second step and third step side ridges 47 and 47 from above in the back frame 39 and screwing them, the mounting plate 43 is attached to the back frame 39. It is firmly fixed to the rear upper part.

  An engagement piece 75 having an L-shape in side view is bent at the upper front surface of the lower mounting plate 44, and this engagement piece 75 is formed at the lower end portion of the lowermost horizontal rod 47 in the back frame 39. The mounting plate 44 is firmly fixed to the lower part of the rear surface of the back frame 39 by engaging and screwing.

  The decorative plate 45 is detachably attached to the rear surfaces of the upper and lower attachment plates 43, 44 with the front surfaces of the upper and lower portions having hook-and-loop fasteners and other fastening means. For example, the decorative plate 45 is preferably formed by flocking the rear surface of a synthetic resin thin plate, or by attaching a cloth to the rear surface of the thin plate.

  The upper and lower ends of the handle 76 facing substantially the vertical direction are fixed to the upper and lower portions of the arc-shaped portion 46 a of the outer vertical rod 46 in the left and right back frames 39. The handle 76 is for turning a two-seat chair around a vertical axis or for gripping a passenger when passing through a passage.

  As is clear from the above, in this embodiment, the upper ends of the pair of left and right vertical rods 46, 46 and the opposing portions below are connected with horizontal rods 47 facing in the left-right direction, respectively. In the backrest structure of a chair, in which a back plate 42 with a cushion body 40 attached to the front surface is attached to the front surface of the back frame 39, the upper end of the back plate 42 is attached to a locking piece 55 provided at the upper end portion of the back frame 39. The side surface 47 is fitted into a groove 70 provided in a portion of the rear surface of the back plate 42 that faces the side surface 47 and is locked. Since the screw 72 is fixed to the back plate 42, the engagement hole 69 at the upper end of the back plate 42 is connected to the upper end of the back frame 39 with the back plate 42 tilted backward from the front of the back frame 39. And then the back plate 42 of the back plate 42 The cushion body 40 can be obtained simply by turning the end rearward and fitting the groove 70 of the back plate 42 to the horizontal frame 47 of the back frame 39 and then fixing the horizontal frame 47 to the back plate 42. Can be easily attached to the back frame 39, and the cushion body 40 can be easily detached from the back frame 39 in the reverse procedure to the above.

  Further, after the cushion body 40 is mounted on the back frame 39, the engagement between the engagement hole 69 of the back plate 42 and the locking piece 55 of the back frame 39, the concave groove 70 of the back plate 42, and the back frame 39. The cushion body 40 is supported by the back frame stably and securely without any positional displacement or rattling by the fitting with the horizontal rod 47 and the fixation of the horizontal rod 47 to the back plate 42. The

  The present invention is not limited to the above-described embodiments, and can be implemented in various modified forms without departing from the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Base frame 2 Seat 3 Backrest 4 Side plate 5 Middle part armrest 6 Side ridge 7, 8 Connection rod 9, 10 Standing member 9a Front piece 9b Side piece 9c Upper horizontal piece 9d Lower horizontal piece 9e Inclined piece 11 Notch 12 Seat receiving frame 13 Bolt 14 Tension material 15 Presser plate 16 Skin material 17 Front cover plate 17a Inclined piece 17b Seat receiving piece 17c Bracket 17d Shaft 18 Hanging cloth 18a Surface fastener 19 Rear cover plate 19a Bracket 20 Base portion 20a Inclined edge piece 20b Horizontal edge piece 21 Standing portion 22 Armrest 23 Elbow rest support portion 24 Elbow rest member 25 Window hole 26 Operation lever 26a Handle portion 27 Axis 28 Bowden cable 28a Outer tube 28b Inner cable 29 Armrest strut 30 Shaft 31 Recess 32 Adjustment bolt 33 Cover piece 34 Fixing screw 35 Elbow rest member 36 Screwed portion 37 Receiving portion 38 Cover member 38a Front piece 38 Side piece 39 Back frame 40 Cushion body 41 Skin material 42 Back plate 42a Backward pieces 43, 44 Mounting plate 45 Dressing plate 46 Vertical rod 46a Arc-shaped portion 47 Horizontal rod 48 Projection 49 Axis 50 Bracket 51 Gas spring 51a Push button 52 , 53 shaft 54 actuating lever 55 locking piece (locking member)
56 Headrest Back Plate 57 Rotating Lever 58 Shaft 59 Supporting Body 60 Notch 61 Folding Table 62 Supporting Leg 63 Shaft 64 Stopper 65 Pin 66 Arc Hole 67 Connecting Rod 68 Window Hole 69 Engagement Hole (Locked Part)
70 concave groove 71 nut 72 set screw (fixing means)
73, 74 Reinforcement member 75 Engagement piece 76 Handle

Claims (4)

A back plate with a cushion mounted on the front surface of a back frame formed by connecting upper ends of a pair of left and right vertical saddles and opposing portions below them with horizontal reeds facing left and right. In the backrest structure of the chair that is attached,
A recessed groove provided in a portion of the rear surface of the back plate that faces the side ridge, and a locked portion provided in the upper end portion of the back plate is locked to a locking member provided in the upper end portion of the back frame. A chair backrest structure characterized in that the recumbent is fitted and the recumbent is fixed to a back plate by a fixing means.   The locking member is a side-viewing rear-facing hook-shaped locking piece provided on the upper surface of the uppermost horizontal bar, and the locked portion is an engaging hole provided in the rear-side piece at the upper end of the back plate. The backrest structure of the chair according to claim 1, wherein a rear edge of the engagement hole is engaged with the engagement piece.   A screw hole is provided in the back end surface of the concave groove in the back plate, and a screw is attached to the screw hole and tightened by screwing a set screw facing the front-rear direction, which is a fastening means penetrating the horizontal plate. The backrest structure of the chair according to claim 1 or 2, which is fixed to the chair.   An attachment plate for attaching a decorative plate that covers the rear surface of the back frame is attached to the back frame by engaging an engagement piece provided on the front surface thereof with a lateral arm of the back frame, and fixing the attachment plate. The backrest structure of the chair according to any one of 3 above.

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