JP4964501B2 - Skin covering structure for chair seats, etc. - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for stretching a skin material in a chair seat or the like, which is capable of improving the workability in stretching the skin material on the front surface of a base board and in improving the durability of the skin material by relieving the tension load applied to the skin material. <P>SOLUTION: An edge material 19 fixed to the front edge 18a of the skin material 18 which covers the front surface of the base board 10 in the chair seat, etc. is formed flat and made of synthetic resin with resiliency. An oval fitting slot 12 with approximately the same width as that of the edge material 19 is formed in the front edge part 10a on the rear surface of the base board 10, and a pair of locking projecting bars 14 projecting inward are formed in the opposite edges in the opening of the fitting slot 12. When both side edges of the edge material 19 approximately parallel to the base board 10 are fitted to the fitting slot 12 and locked to the pair of locking projecting bars 14 respectively, the intermediate part of the edge material 19 is resiliently bent. In this way, the tension of the skin material can be adjusted. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a structure for stretching a skin material in a chair seat, backrest, headrest or the like (collectively referred to as a seat or the like).

Conventionally, for example, as a structure in which a skin material is stretched on the surface of a board in a seat of a chair, a base piece made of a synthetic resin on the periphery of the skin material, and an elastic locking piece continuously provided at a tip portion of the base piece, The edge material is fixed to the insertion groove provided on the peripheral edge of the back surface of the substrate in a state where the elastic locking piece of the edge material is folded in an inverted U shape so as to overlap the base piece. By inserting and using the elastic restoring force of the elastic locking piece, the free end of the elastic locking piece is locked to the locking projection protruding from the opening edge of the insertion groove, so that the epidermis is formed on the surface of the substrate. There is one in which a material is stretched (see Patent Document 1).
Japanese Patent Laid-Open No. 11-244103

  However, in the skin material extending structure described in Patent Document 1, the elastic locking piece has to be bent in an inverted U shape with respect to the base piece, and the work is complicated, and at that time, a large force is applied. Necessary and workability is poor.

  Further, when applied to a chair seat, the front part of the skin material is pulled to the back of the occupant's knees, thighs, and the like at the time of taking off and seating, and stress concentrates on the front part of the seat, and the part is easily damaged.

  In view of the above-mentioned problems of the conventional technology, the present invention can improve the workability at the time of stretching the skin material on the substrate surface, relax the tensile load on the skin material, An object of the present invention is to provide a skin material extending structure in a chair seat or the like that can improve the durability of the skin material.

According to the present invention, the above problem is solved as follows.
(1) A chair seat or the like in which a skin material is stretched on the surface of the board by locking an edge material fastened to the periphery of the skin material covering the surface of the board in a chair seat or the like to the back side of the board. in the skin material stretched structure in, on at least part of the periphery of the skin material, and fastening the central portion of the width of the strip formed in the synthetic resin flat plate having elasticity, wherein the back surface of the substrate A pair of latches that are provided with an elongated fitting hole having substantially the same width as the edge member at the edge corresponding to the edge member, and projecting inward from each other at the opposite edge of the opening of the fitting hole. Protrusions are provided, and these one pair of engaging protrusions are fitted into the fitting holes to engage both side edges of the edge member substantially parallel to the substrate. The tension of the skin material can be adjusted by elastic bending.

(2) Chair seat or the like in which the skin material is stretched on the surface of the board by locking the edge material fastened to the periphery of the skin material covering the surface of the board in the chair seat or the like to the back side of the board In the skin material extending structure according to claim 1, the edge material fastened to at least a part of the peripheral edge of the skin material is formed into a flat plate shape made of a synthetic resin having elasticity, and corresponds to the edge material on the back surface of the substrate. A long hole-like fitting hole having substantially the same width as the edge material is provided at the edge, and a pair of locking protrusions protruding inward from each other is provided at the opposite edge of the opening of the fitting hole, The pair of locking ridges are fitted into the fitting holes to lock both side edges of the edge material substantially parallel to the substrate, and the middle portion of the edge material is elastically bent. Accordingly, as may adjust the tension of the skin material, and further, both side edges of the strip to be engaged with the pair of locking projections The thickness of the large cities than the plate thickness of the intermediate portion, the intermediate portion is sewn to the edges of the skin material.

(3) Chair seat or the like in which the skin material is stretched on the surface of the substrate by locking the edge material fastened to the periphery of the skin material covering the surface of the substrate in the chair seat or the like to the back side of the substrate In the skin material extending structure according to claim 1, the edge material fastened to at least a part of the peripheral edge of the skin material is formed into a flat plate shape made of a synthetic resin having elasticity, and corresponds to the edge material on the back surface of the substrate. A long hole-like fitting hole having substantially the same width as the edge material is provided at the edge, and a pair of locking protrusions protruding inward from each other is provided at the opposite edge of the opening of the fitting hole, The pair of locking ridges are fitted into the fitting holes to lock both side edges of the edge material substantially parallel to the substrate, and the middle portion of the edge material is elastically bent. Accordingly, as may adjust the tension of the skin material, and further, have the front and rear left and right edges of the rear surface of the substrate and surface material Along this, a fitting hole and a flat edge material are provided, and by fitting and locking them together, a tension adjusting function is imparted at any of the front, rear, left and right edges of the skin material, and An edge material different from the edge material, which is fixed to the remaining edge of the skin material, is locked to the remaining edge of the substrate in a manner that does not have a function of adjusting the tension of the skin material .

(4) In the above item (3) , the shape of the edge material different from that of the flat plate-like edge material is such that a tip-like elastic locking claw is provided at the tip of the flat plate-like base piece, Are inserted into the insertion holes provided in the remaining edge portions of the substrate, and the elastic locking claws are locked to the opening edge portions on the surface side of the insertion holes in the substrate.

  (5) In any one of the above items (1) to (4), the fitting hole is formed in an arc shape in which the central portion swells outward when viewed from the bottom, and is fitted into the fitting hole in the edge member. A plurality of notches are provided in the side edge portion that becomes the inner side when they are joined, separated in the longitudinal direction of the edge material.

  (6) In the above item (5), a rib for bridging the portion on the surface side of the facing surface of the fitting hole is provided in the middle portion in the longitudinal direction of the fitting hole, and a plurality of notches in the edge member are It is provided corresponding to the rib so that the notch can be fitted into the rib when the edge member is fitted into the fitting hole.

  (7) In any one of the above items (1) to (6), a fitting hole is provided along the front edge of the substrate, and the fitting hole is fixed to the front edge of the skin material. The rim material is fitted and locked.

According to the present invention, the following effects can be achieved.
According to the invention of the above item (1) , the edge member is formed into a flat plate shape made of a synthetic resin having elasticity, and a pair of latches whose both side edge portions are provided at opposite edges in the opening portion of the fitting hole. It is designed to be able to adjust the tension of the skin material by locking to the ridge and elastically bending the middle part of the edge material. Even when pulled and tensioned, the edge material can be elastically deformed to absorb the tension, relax the tensile load applied to the skin material, and improve the durability of the skin material. .
In addition, after inserting the edge material into the fitting hole at an angle, the one side edge portion is locked to one of the locking protrusions, and then the edge material is rotated so as to be substantially parallel to the substrate. By locking the other side edge to the other locking protrusion, the edge material can be easily attached to the substrate, and the workability at the time of stretching the skin material on the substrate surface can be improved. it can.

According to the invention of the above item (2) , in addition to the effect of the invention of the above item (1), the thickness of both side edges of the edge member to be locked to the pair of locking protrusions is changed to the middle plate. By making it larger than the thickness, the middle part of the edge material is easily bent, and the edge of the skin material is sewn to this middle part, so when the skin material is strained, the middle part of the edge material is easily It can bend and can absorb the tension of the skin material, and the effect that the durability of the skin material can be improved can be achieved.

According to the invention of the above (3) , in addition to the effect of the invention of the above (1) , a tension adjusting function is imparted to the skin material only at any one of the four sides of the substrate, and the remaining 3 Since the side is not provided, the effect of increasing the stability of the skin material can be achieved as compared with the case where the tension adjusting function is provided to the entire periphery of the skin material .

According to the invention of the above (4) , the shape of the edge material different from the plate-like edge material is such that the edge of the plate-like base piece is provided with a twist-like elastic locking claw. The elastic locking claw is inserted into the insertion hole provided at the remaining edge of the substrate and the elastic locking claw is locked to the opening edge on the surface side of the insertion hole in the substrate. The edge material can be easily inserted into the hole, and the three sides of the skin material can be securely fixed to the substrate, thereby increasing the stability of the skin material.

According to the invention of the above (5) , the fitting hole is formed in an arc shape in which the central portion swells outward when viewed from the bottom, and the side edge of the edge member that is the inner side when fitted into the fitting hole Since the plurality of cutouts are provided in the part so as to be separated from each other in the longitudinal direction of the rim material, the rim material can be easily curved along the arc-shaped fitting hole, thereby improving workability. it can.
Moreover, because of the elastic restoring force of the arc-shaped edge member, the center part of the edge member is pressed against the inner side surface of the fitting hole, and both sides of the edge member are pressed against the outer side surface of the fitting hole. The rim material is difficult to be removed from the fitting hole.

According to the invention of the above (6), a rib for bridging the portion on the surface side of the facing surface of the fitting hole is provided in the middle portion in the longitudinal direction of the fitting hole, and the plurality of notches in the edge member are It is provided corresponding to the rib, and when the edge material is fitted into the fitting hole, the notch can be fitted into the rib. The decrease can be compensated for by the rib, and the edge member can be easily fitted into the fitting hole without being obstructed by the rib, so that the workability can be improved.

According to the invention of the above (7) , the fitting hole is provided along the front edge of the substrate, and the flat edge material fixed to the front edge of the skin material is fitted and locked in the fitting hole. Therefore, when applied to a chair seat, when the seat occupant is taking off and seating, the front part of the skin material is pulled by the back of the seat occupant's knees and thighs, and the tension is applied. Absorbing and preventing stress concentration on the surface can improve the durability of the skin material.

An embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is an overall perspective view of a chair provided with an embodiment of the present invention as viewed from the front. In this embodiment, the present invention is applied to a structure in which a skin material is stretched in a chair seat.

  As shown in FIG. 1, the reclining chair (1) includes a leg body (4) having a plurality of radial leg rods (3) each having a caster (2) provided at the tip. A telescopic pedestal (5) is erected at the center of the leg (4), and a backrest (6) is provided at the upper end of the pedestal (5) so that it can tilt backward. Yes.

  In addition, an armrest (7) and a seat (8) are provided at the upper end of the pedestal (5), and this seat (8) is linked to the back tilt of the backrest (6), To move to.

Next, the structure of the seat (8) will be described with reference to FIGS.
As shown in FIGS. 2 and 3, the seat (8) has a substantially horizontal substrate (10) provided with a cushion material (9) on the surface (upper surface) as necessary. ) Is formed of a hard synthetic resin material so as to form a substantially square shape in plan view, and a plurality of reinforcing ribs (11) (11) are provided on the surface in the front-rear and left-right directions.

  The front edge portion (10a) of the substrate (10) has a fitting hole (12) in the shape of a long hole with a circular arc when viewed from the bottom so that the center portion swells outward (front) so as to be substantially parallel to the front edge However, it is provided so as to penetrate vertically.

  As shown in FIGS. 4 and 6, the fitting hole (12) has a plurality of ribs (13a) whose lower edge is inclined inward and upward, and the lower edge is substantially in the middle of the lower edge of the rib (13a). The plurality of ribs (13b) that are substantially horizontal in height are alternately arranged at appropriate intervals (preferably at equal intervals) in the longitudinal direction of the fitting hole (12), and before and after the fitting hole (12). Are provided so as to bridge the substantially upper half portions of the opposing surfaces (12a) and (12a).

A pair of front and rear locking projections projecting inward from each other at the lower ends of the front and rear facing surfaces (12a) and (12a) of the fitting hole (12), that is, the opposite edges of the lower end opening of the fitting hole (12). Articles (14) and (14) are provided.
A notch (14a) for die cutting for forming the ribs (13a) (13b) is provided at the opposing edges of the both locking protrusions (14) (14).

  As shown in FIGS. 2, 3, and 5 to 8, both side edges (10 b) (10 b) and rear edge (10 c) of the substrate (10) Long hole-like insertion holes (15) along the edges are provided so as to penetrate vertically.

In each insertion hole (15), a plurality of ribs (16) are provided with an appropriate interval (preferably equal intervals) in the longitudinal direction of each insertion hole (15), and the opposing surface (15a) of each insertion hole (15). (15a) is provided to be crosslinked.
A locking step (17) is formed at the opening edge inside the upper end of the insertion hole (15).

  As the skin material (18) covering the surface of the substrate (10) and the cushion material (9), for example, a material made of leather, synthetic leather, cloth (woven fabric, knitted fabric) or the like is preferably used.

  The first edge material (19) is fixed to the front edge (18a) of the skin material (18). As shown in FIGS. 3 and 4, the edge member (19) is an elastic synthetic resin having substantially the same width as the fitting hole (12) provided in the front peripheral edge (10a) of the substrate (10). It is formed in an elongated flat plate shape, and is sewn to the front edge (18a) of the skin material (18) at the center of its width.

On both side edges of the rim material (19), ball edges (20) and (20) having a thickness larger than the thickness of the intermediate portion are formed so that the intermediate portion of the rim material (19) is easily bent. It is.
Further, the loose edge of the edge member (19) protruding outside the skin material (18) has a plurality of square shapes that can be fitted into the plurality of ribs (13b) in the fitting hole (12) of the substrate (10). The notches (21) are provided at equal intervals with the interval between the ribs (13b).

  By providing the plurality of notches (21), the edge member (19) swells outward, that is, forward, from the straight state indicated by the imaginary line in FIG. It can be easily curved in the horizontal direction so as to form an arc shape. Further, as will be described later, when the skin material (18) is stretched to the substrate (10), by fitting each notch (21) to the lower edge of the corresponding rib (13b), the skin material ( The tensioning work of 18) can be performed easily.

  As shown in FIGS. 3 and 5-8, the second edge material (22) is fixed to the left and right side edges (18b) (18b) and the rear edge (18c) of the skin material (18), respectively. ing. The rim material (22) includes a base strip (23) made of an elastic synthetic resin having an elongated strip shape, and a tip portion of the base strip (23) (as shown in FIGS. 3 and 5 to 8). The upper end when the base piece (23) is directed in the vertical direction), and a resilient elastic pawl (24) that is formed in an inverted V-shape that forms an acute angle with the base piece (23). The base piece (23) is sewn to the left and right side edges (18b) (18b) and the rear edge (18c) of the skin material (18) at the base end (the same upper and lower ends).

  A plurality of rectangular notches (25) that can be fitted into the plurality of ribs (16) in the insertion holes (15) of the substrate (10) are provided at the tip of the edge member (22), and the interval between the ribs (16) Are provided at equal intervals.

  By providing the plurality of notches (25), it is easy to stretch the skin material (18) on the substrate (10). That is, when the edge member (22) is inserted into the insertion hole (15), the notch (25) is fitted to the rib (16), whereby the edge member (22) is inserted into the insertion hole (15). Easy insertion and positioning.

Next, with reference to FIG. 6 to FIG. 8, a procedure for extending the skin material (18) to the substrate (10) will be described.
The first edge material (19) is attached to the front edge (18a), and the second edge material (22) is attached to the left and right edges (18b) (18b) and the rear edge (18c) of the skin material (18). FIG. 8 shows the edge material (22) attached to the rear edge (18c) after covering each of the sewn skin material (18) from above the substrate (10) with the cushion material (9) attached to the upper surface. As indicated by an imaginary line, the substrate (10) is inserted from below into the insertion hole (15) of the rear edge (10c) of the substrate (10) with the tip facing upward.

  At this time, the notch (25) of the edge member (22) is fitted to the plurality of ribs (16) in the insertion hole (15) of the substrate (10), while the edge member (22) is inserted into the insertion hole (15). By being inserted into the edge member, the edge member (22) is guided to the insertion hole (15) and easily positioned.

  When the edge member (22) is inserted into the insertion hole (15), the elastic locking claw (24) is elastically deformed so as to be substantially parallel to the base piece (23) and passes through the insertion hole (15). Then, after passing, due to the restoring force, the lower end portion expands with respect to the base piece (23) and engages with the locking step portion (17), whereby the edge member (22) is inserted into the insertion hole ( 15) As shown by a solid line in FIG. 8, the rear edge (18c) of the skin material (18) is attached to the lower surface of the rear edge portion (10c) of the substrate (10).

  Next, the edge material (22) attached to both side edges (18b) and (18b) of the skin material (18) is processed in the same manner as described above, as shown in FIG. 10b) (10b) is inserted into the insertion hole (15) sequentially or simultaneously from below, and both side edges (18b) (18b) of the skin material (18) are connected to both side edges (10b) of the substrate (10). Attach to the bottom of (10b).

  Thereafter, as indicated by an imaginary line in FIG. 6, the edge material (19) attached to the front edge (18a) of the skin material (18) is placed below the substrate (10), and the tip is located inside the substrate (10). It is inserted from below into the fitting hole (12) at the front edge (10a) of the substrate (10) facing diagonally upward.

  At this time, when the plurality of notches (21) in the edge member (19) are fitted to the lower edge of the corresponding rib (13b), the edge member (19) is inserted deeply into the fitting hole (12). The edge member (19) can be easily positioned in the left-right direction with respect to the fitting hole (12).

  After the entire edge member (19) is fitted in the fitting hole (12) above the front and rear locking protrusions (14), (14), the edge member (19) is moved slightly forward, The front edge of the edge member (19) is locked to the upper surface of the front locking protrusion (14).

  After that, when the hand or the holder is released from the edge material (19), the edge material (19) rotates downward with the front edge as a fulcrum due to the tension of the skin material (18). As shown, the rear edge abuts the upper surface of the rear locking ridge (14), the edge member (19) is substantially horizontal, and the front and rear edges of the front and rear locking ridges (14) ( 14) and is secured from the fitting hole (12), and the covering work of the skin material (18) is completed.

  In the state where the skin material (18) is stretched in this way, for example, even if the skin material (18) is pulled and tensioned by the movement of a seated person, as shown in FIG. The middle part of the front and rear direction of 19) is elastically deformed downward, so that the tension can be absorbed, the tensile load on the skin material (18) is relaxed, and the durability of the skin material (18) Can be improved.

  Further, as described above, when the edge member (19) is fitted and locked in the fitting hole (12), the edge member (19) can be easily attached to the substrate (10), and the substrate (10 ) The workability when the skin material (18) is stretched on the surface can be improved.

  Further, as described above, the intermediate portion of the long hole-like fitting hole (12) and the insertion hole (15) is bridged by the ribs (13a), (13b), and (16), thereby making them the substrate (10). Even if it is formed long along the peripheral edge of the substrate, the strength of the peripheral edge of the substrate (10) does not decrease, and the insertion groove is formed by bending the peripheral edge of the substrate (10) in an inverted U shape. The entire substrate (10) can be made thinner than the conventional one that forms the substrate.

  Moreover, the edge members (19) and (22) are inserted into the fitting hole (12) and the insertion hole (15) so that the notches (21) and (25) fit into the ribs (13b) and (16). Thus, the edge members (19) and (22) are guided and positioned by the engagement between the notches (21) and (25) and the ribs (13b) and (16), so that the skin to the substrate (10) Workability at the time of mounting the material (18) can be improved.

In addition, the mounting order of the front and rear, left and right edge members (19) and (22) on the substrate (10) is arbitrary.
For example, after the front edge member (19) is first fitted and locked in the fitting hole (12) of the front edge portion (10a) of the substrate (10), the rear edge member (22) is (10) Insert and lock into the insertion hole (15) of the rear edge (10c), and finally, the left and right edge members (22) and (22) are attached to both side edges (10b) of the substrate (10). It may be inserted into the insertion holes (15) and (15) of (10b) and locked.

The present invention can be implemented in a number of different forms without departing from the scope of the present invention.
For example, a plate-like edge material (19) is provided only on the rear edge (18c) of the skin material (18), and this is provided with a fitting hole provided on the rear edge (10c) of the back surface of the substrate (10) ( 12), in the same manner as described above, fitted and locked, and the front edge (18a) and both side edges (18b) (18b) of the skin material (18) are provided with an edge material (22), Insert it into the insertion holes (15) and (15) provided in the front edge (10a) and both side edges (10b) and (10b) on the back surface of the substrate (10), and A flat edge member (19) is provided on all the front and rear and left and right edges, and this is fitted to the fitting holes (12) provided on the front and rear and right and left edges of the back surface of the substrate (10) in the same manner as described above. It can also be fitted and locked.

  Further, in the above-described embodiment, the present invention is applied to a chair seat, but the present invention can be applied to a chair backrest, a headrest, and the like only by changing the direction and shape thereof. .

It is the whole perspective view which looked at the chair provided with one embodiment of the present invention from the slant front. It is a top view of the board | substrate which comprises a seat. It is the disassembled perspective view which looked at the board | substrate and the edge material from diagonally downward. It is an expansion disassembled perspective view of the principal part of FIG. It is a disassembled perspective view which longitudinally cuts and shows a part of board | substrate and an edge material. It is an enlarged vertical side view along VI-VI of FIG. It is an expansion vertical side view in alignment with the VII-VII line of FIG. It is an enlarged vertical side view along the VIII-VIII line of FIG. It is an expansion vertical side view of the principal part of FIG. 6 when tension | tensile_strength is applied to a skin material.

(1) Reclining chair
(2) Casters
(3) Footpad
(4) Leg
(5) pedestal
(6) Backrest
(7) Armrest
(8) Seat
(9) Cushion material
(10) Board
(10a) Front edge
(10b) Side edge
(10c) Rear edge
(11) Reinforcing rib
(12) Mating hole
(12a) Opposite surface
(13a) (13b) Ribs
(14) Locking ridge
(14a) Notch
(15) Insertion hole
(15a) Opposite surface
(16) Rib
(17) Locking step
(18) Skin material
(18a) Leading edge
(18b) Side edge
(18c) Trailing edge
(19) Edge material
(20) Ball edge
(21) Notch
(22) Edge material
(23) Base piece
(24) Elastic locking claw
(25) Notch

Claims (7)

A skin material in a chair seat or the like in which a skin material is stretched on the surface of the substrate by locking an edge material fastened to the periphery of the skin material covering the surface of the substrate in a chair seat or the like to the back surface side of the substrate In the tension structure,
At least a portion of the periphery of the skin material, and fastening the central portion of the width of the synthetic resin flat to form the rim material having elastic, the edge corresponding to the edge material on the back surface of the substrate And a pair of locking projections projecting inward from each other are provided at opposing edges of the opening of the fitting hole. By engaging the engagement protrusions with the engagement holes and engaging both side edges of the edge material substantially parallel to the substrate, the middle part of the edge material is elastically bent, A skin material tensioning structure in a chair seat or the like, wherein the tension of the material can be adjusted. A skin material in a chair seat or the like in which a skin material is stretched on the surface of the substrate by locking an edge material fastened to the periphery of the skin material covering the surface of the substrate in a chair seat or the like to the back surface side of the substrate In the tension structure,
The edge material fastened to at least a part of the peripheral edge of the skin material is formed into a flat plate shape made of synthetic resin having elasticity, and the edge material corresponding to the edge material on the back surface of the substrate is almost the same as the edge material. An elongated fitting hole having the same width is provided, and a pair of locking protrusions protruding inward from each other is provided at the opposing edge of the opening of the fitting hole, and the pair of locking protrusions. Next, the both side edges of the edge material which is fitted in the fitting hole and substantially parallel to the substrate are locked, and the middle part of the edge material is elastically bent to adjust the tension of the skin material. Further, the plate thickness of both side edges of the edge member locked to the pair of locking protrusions is made larger than the plate thickness of the intermediate part, and the edge of the skin material is formed in this intermediate part. Skin covering structure for chair seats, etc., characterized by sewing . A skin material in a chair seat or the like in which a skin material is stretched on the surface of the substrate by locking an edge material fastened to the periphery of the skin material covering the surface of the substrate in a chair seat or the like to the back surface side of the substrate In the tension structure,
The edge material fastened to at least a part of the peripheral edge of the skin material is formed into a flat plate shape made of synthetic resin having elasticity, and the edge material corresponding to the edge material on the back surface of the substrate is almost the same as the edge material. An elongated fitting hole having the same width is provided, and a pair of locking protrusions protruding inward from each other is provided at the opposing edge of the opening of the fitting hole, and the pair of locking protrusions. Next, the both side edges of the edge material which is fitted in the fitting hole and substantially parallel to the substrate are locked, and the middle part of the edge material is elastically bent to adjust the tension of the skin material. In addition, by providing a fitting hole and a plate-like edge member along any of the front, rear, left and right edges of the back surface and the skin material of the substrate, and fitting and locking them together The tension adjustment function is provided at any of the front, rear, left and right edges of the skin material, and the remaining edges of the substrate It was fixed to the rest of the edges of the skin material, the skin in the different edge material and the edge material, the seat and the like of the chair, characterized in that engaged with embodiments having no tension adjustment function of the skin material ZaiCho Construction structure. The shape of the edge material, which is different from the flat edge material, is assumed to be provided with a hook-like elastic locking claw at the tip of the flat plate base piece, and this is inserted into the remaining edge portion of the substrate. 4. The skin material extending structure for a seat of a chair or the like according to claim 3, wherein the elastic locking claw is inserted into the opening edge of the board and is locked to the opening edge of the surface of the insertion hole. In the bottom view, the fitting hole is formed in an arc shape in which the central portion swells outward, and a plurality of notches are formed on the side edge portion that is inside when the fitting member is fitted to the fitting hole. The skin material tensioning structure in a chair seat or the like according to any one of claims 1 to 4, wherein the skin material is stretched in the longitudinal direction of the edge member. A rib for bridging the portion on the surface side of the opposite surface of the fitting hole is provided at the middle portion in the longitudinal direction of the fitting hole, and a plurality of notches in the edge member are provided corresponding to the rib, and the fitting hole 6. The skin covering structure for a chair seat or the like according to claim 5 , wherein the notch can be fitted into the rib when the edge member is fitted into the seat.   2. A fitting hole is provided along the front edge of the substrate, and a flat edge material fixed to the front edge of the skin material is fitted and locked in the fitting hole. A skin material extending structure in a chair seat or the like according to any one of -6.

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