JP5940915B2 - Chair - Google Patents

Description

  The present invention relates to a chair whose backrest includes a backrest frame, a backrest member mounted on the front surface thereof, and a rear surface member mounted on the rear surface of the backrest frame.

Examples of conventional chairs of this type include the following (A) to (C).
(A) The fitting portion (2a) of the back inner shell member (2) is fitted to the upper ends of the pair of left and right columnar members (12), (12) in the back support member (1), and An engagement member (13) for connecting the columnar members (12) and (12) to each other and an engaging piece (4a) of the outer shell member (4) engaged (for example, see Patent Document 1).

  (B) An upper receiving portion in which the lower cylindrical portion (28) of the back cover (22) is fitted to the upper end portion of the back frame (20) and the horizontal rib (27) integrated with the downward cylindrical portion (28) is provided. (35) fitted with a downward cylindrical upper mounting portion (34) provided on the rear surface of the backrest plate (21) (see, for example, Patent Document 2).

  (C) The back shell (2) from the front side to the nut (17b) fixed to the upper horizontal hook (8) that connects the pair of left and right vertical hooks (6) and (6) in the back frame (1) The tightening screw (17a) that has been passed through is screwed and tightened, and the engaging claw (22) of the back frame cover (3) is engaged with the upward engaging hole (8b) provided in the upper reed (8). Combined (see, for example, Patent Document 3).

Japanese Patent No. 3543071 Japanese Patent No. 4036428 Japanese Patent No. 3543071

  In the above (A), the back inner shell member (2) and the outer shell member (4) are attached to the backrest support member (1) independently of each other. The outer shell member (4) and the outer shell member (4) are not positioned with respect to each other, so that they may be displaced from each other or a gap may be formed between them, and the assembly work is complicated.

  In the case of the above (B), a bulky member such as a downward cylindrical portion (28) or a cylindrical upper mounting portion (34) must be disposed between the back cover (22) and the backrest plate (21). Therefore, if the backrest plate (21) is not removed, the back cover (22) must be removed from the back frame (20). It is impossible to replace the back cover (22).

  In the case of the above (C), the back shell (2) and the back frame cover (3) are attached to the back frame (1) independently of each other as in the case of the above (A). The shell (2) and the back frame cover (3) are not positioned with respect to each other, and there is a possibility that they may be displaced from each other or a gap may be formed between them. It is complicated.

  Further, in any of (A) to (C), a frame constructed of a thick pipe material is disposed between the front member and the rear member of the backrest. The width becomes large, the backrest cannot be thinned, and the assembly work is complicated.

  The present invention has been made in view of the above-mentioned problems of the prior art. The backrest member and the rear surface member can be positioned with respect to each other and attached to the backrest frame, and the assembling work can be performed. In addition, the backrest member or the rear surface member can be easily detached from the backrest frame alone, and even if the backrest member or the rear surface member is formed of a soft member, the edge portion of the backrest member or the rear surface member is The object is to provide a chair that is difficult to peel off from the drowning frame.

According to the present invention, the above problem is solved as follows.
(1) In a chair including a leg and a backrest supported by the leg, the backrest is supported by the leg and has a backrest frame provided with a fitted portion at an upper end; A backrest member attached to the front surface of the backrest frame and provided with a fitting portion to be fitted to a fitted portion of the backrest frame on the upper rear surface; and attached to the rear surface of the backrest frame; and A fitting portion that fits on the upper front surface behind the fitting portion of the backrest member in the fitted portion of the backrest frame so as to be in contact with the rear surface of the fitting portion of the backrest member. And a rear member provided.

According to such a configuration, by fitting the fitting portion of the backrest member and the fitting portion of the rear surface member side by side to the fitted portion provided at the upper end of the backrest frame, the backrest frame The backrest member on the front and the rear member on the back of the backrest frame can be easily attached, making the assembly work easy, and the backrest fitted to the mating part of the backrest frame Since the rear surface of the fitting portion of the member and the front surface of the fitting portion of the rear surface member can contact each other, the backrest member and the rear surface member are positioned in the front-rear direction, and the distance between them in the front-rear direction varies. When one of the fitting portions is about to be detached from the fitted portion, it can be brought into contact with the other fitting portion to prevent the separation.
Moreover, since the backrest member and the rear surface member can be attached to and detached from the backrest frame independently of each other, their replacement work can be easily performed.
Further, since the fitted portion is provided at the upper end of the backrest frame, the backrest member is supported by the backrest frame over a wide area, and the backrest member or the rear surface member is formed of a soft material. Even so, it is possible to prevent the edge portion from peeling off from the backrest frame.

(2) In the above item (1), one of the backrest member and the rear member is formed of a soft material, and the other is formed of a hard material.

  According to such a configuration, since the rear surface of the fitting portion of the backrest member that is fitted to the fitted portion of the backrest frame and the front surface of the fitting portion of the rear surface member are in contact with each other, The mating portion formed of the material is pressed in the front-rear direction by the mating portion formed of the hard material, so that the edge portion formed of the soft material is prevented from peeling from the backrest frame. .

(3) In the above item (1) or (2), the fitted portion is an engagement hole opened upward in the upper end surface of the backrest frame, and the fitted portion of the backrest member is the backrest member. A downward engaging piece provided at the upper part on the rear surface side and a fitting part of the rear member as a hanging piece provided at the upper part on the front side of the rear member.

  According to such a configuration, the downward-facing engagement piece that is the fitting portion of the backrest member and the hanging piece that is the fitting portion of the rear member are respectively connected to the engagement portion that is the fitted portion from above the backrest frame. The backrest member and the rear surface member can be easily mounted on the front and rear surfaces of the backrest frame simply by dropping into the joint hole.

(4) In any one of the above items (1) to (3), a second fitting portion facing backward is provided below the fitting portion on the back surface of the backrest member, and the second fitting portion is connected to the back. The backrest member is mounted on the front surface of the backrest frame by fitting from the front to a second fitted portion provided on the front surface of the backrest frame.

  According to such a configuration, after the fitting portion of the backrest member is fitted to the fitted portion at the upper end of the backrest frame from above, the second fitting portion provided on the rear surface of the backrest member is By fitting from the front to the second fitting part provided on the front surface of the leaning frame, the backrest member can be easily rotated on the front surface of the backrest frame by rotating it backward with the fitting part as a fulcrum. It can be attached and the assembly work can be simplified.

(5) In any one of the above items (1) to (4), a third fitting portion facing forward is provided below the fitting portion on the front surface of the rear member, and the third fitting portion is placed on the back. The rear member is mounted on the back surface of the backrest frame by fitting the third fitted portion provided on the rear surface of the frame from behind.

  According to such a configuration, after fitting the fitting portion of the rear member to the fitting portion at the upper end of the backrest frame from above, the second fitting portion provided on the front surface of the rear member is used as the backrest frame. The rear member can be easily attached to the rear surface of the backrest frame so that the rear member is rotated backward with the fitting portion as a fulcrum by fitting the second fitted portion provided on the rear surface from the rear. As a result, assembly work can be simplified.

  According to the present invention, the backrest member and the rear surface member can be positioned with respect to each other and attached to the backrest frame, and the assembling work is easy, and the backrest member or the rear surface member is separated from the backrest frame. In addition, even if the backrest member or the rear surface member is formed of a soft member, the chair can be provided in which the edge portion is not easily peeled off from the backrest frame.

It is a front view of one Embodiment of the chair of this invention. Similarly, it is the perspective view seen from diagonally forward. It is the disassembled perspective view which looked at a part of the backrest and the backrest support ridge from diagonally forward. It is the disassembled perspective view which looked at the backrest from diagonally backward. It is a rear view of the backrest when the rear cover is removed It is the VI-VI line expansion vertical side view of FIG. 5 in the state which attached the back cover and the backrest support collar. It is the VII-VII line enlarged vertical side view of FIG. 5 in the state which attached the back cover and the backrest support rod. It is the VIII-VIII line enlarged vertical side view of FIG. 5 in the state which attached the rear surface cover. It is the IX-IX line expanded sectional view of Drawing 5 in the state where the back cover was attached. FIG. 6 is an enlarged cross-sectional plan view taken along line XX of FIG. 5 with a rear cover attached. FIG. 6 is an enlarged cross-sectional plan view taken along the line XI-XI in FIG. 5 with a rear cover attached. FIG. 6 is an enlarged cross-sectional plan view taken along line XII-XII in FIG. 5 with a rear cover attached. FIG. 6 is an enlarged cross-sectional plan view taken along line XIII-XIII in FIG. 5 with a rear cover attached. It is the XIV-XIV line expanded sectional view of FIG.

Hereinafter, an embodiment of a chair of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, in this chair, the upper end of the column 3 in a leg 4 in which a column 3 is erected in the center of five radially extending legs 2 each having a caster 1 at the tip. Further, a support body 7 that supports the seat 5 and the backrest 6 is provided.

The backrest 6 extends rearward from the support body 7 and is then supported by the upper portion of the upright portion of the backrest support collar 8 (see FIG. 3) that stands in a side-view forward L shape.
The front end portion of the backrest support rod 8 is pivotally attached to the support body 7 with an axis (not shown) whose front end portion faces in the left-right direction, and can be tilted backward with respect to the support body 7 together with the backrest 6. However, since the reclining mechanism for the subsequent tilt is not directly related to the present invention, illustration and detailed description thereof are omitted.
In some cases, the front end portion of the backrest support rod 8 is fixed to the support 7.

  The backrest 6 includes a backrest frame 9 having a substantially square frame shape made of a hard synthetic resin material, and a backrest member made of a flexible soft material such as an elastomer or a soft synthetic resin material mounted on the front surface. 10, a bag-like skin material 11 attached to the backrest member 10 so as to enclose the front surface and the outer periphery of the backrest member 10, and a rear surface of the backrest frame 9 made of a hard synthetic resin material. And a rear cover 12 that is a rear member mounted on the backrest frame 9.

  The backrest frame 9 includes a pair of left and right vertical saddles 13 and 13 facing in the vertical direction, and a portion slightly below the central portion in the vertical direction in a side view is gently bent so as to protrude forward. The upper connection parts are connected together, and the upper connection part 14 that is curved in a substantially arc shape so that the center part in the left-right direction protrudes rearward in plan view, and the lower connection parts of the left and right vertical hoists 13 and 13 are connected to each other. A lower connecting portion 15 that has a vertical width larger than the vertical width of the portion 14 and is curved in a substantially arc shape so that a central portion in the left-right direction protrudes rearward in plan view, and an upper end of the lower connecting portion 15 A pair of left and right inclined rods 16, 16 extending obliquely from the central portion in the left-right direction toward the upper part of the left and right vertical rods 13, 13. In addition, the backrest frame 9 and the backrest support rod 8 may be formed as a single integrally formed member.

As shown in FIG. 6 and FIG. 7, a rectangular concave portion 17 having an opening at the lower end is provided at the central portion in the left-right direction of the lower connecting portion 15, and the rear portion of the backrest support rod 8 is raised in this concave portion 17. The backrest frame 9 is attached to the back frame 9 by fastening the upper end portion thereof from below and fastening the upper end portion and the front wall 18 of the recess 17 in the lower connecting portion 15 with four bolts and nuts 19. It is firmly fixed to the upper end portion of the upright portion of the rear portion of the curl support rod 8.
As shown in FIG. 3, the upright portion of the backrest support rod 8 is formed by bending up and down protruding ridges 8 a and 8 a that protrude forward and on both left and right sides of the metal plate that faces in the left and right direction. Thus, as shown in FIG. 7, bolts and nuts 19 are fastened to the front wall 18 at the two upper portions of each protrusion 8a.

  As shown in FIG. 3 and FIG. 8 to FIG. 13, a front concave groove 20 facing the vertical direction is provided on the front surface of each of the left and right vertical collars 13 in the backrest frame 9, and intersects with the concave groove 20. As described above, each vertical rod 13 is provided with a plurality of pin insertion holes 21 facing in the left-right direction at appropriate intervals in the vertical direction.

As shown in FIGS. 4, 5, and 10, an arcuate guide groove 22 facing in the left-right direction for guiding the pin to each pin insertion hole 21 is provided on the outer side of the rear surface of each vertical shaft 13. It has been.
As shown in FIGS. 4, 5, and 8, a vertically long penetration penetrating in the front-rear direction is formed in the groove bottom portion of the concave groove 20 in each vertical rod 13 and corresponding to the pin insertion hole 21. A hole 23 is provided.

  As shown in FIGS. 4, 5, and 12, a rectangular shape penetrating in the front-rear direction including a part of the groove 20 is formed on both sides of the lower connecting portion 15 at the lower portion of each vertical shaft 13. A through hole 24 is provided.

  As shown in FIGS. 4, 5, 11, and 13, stepped holes 25, 25 forming a third fitted portion are formed in the upper and lower portions sandwiching the through hole 24 on the rear surface of each vertical rod 13. Is provided.

  As shown in FIGS. 3, 5, and 8, engagement holes 26, which are fitted portions having a substantially square shape in plan view, are formed at both ends of the upper connecting portion 14 at the upper end of each vertical shaft 13. Is provided.

  As shown in FIG. 3 to FIG. 5 and FIG. 9, an oval shallow recessed step portion 27 facing in the left-right direction is provided at the center portion in the left-right direction on the rear surface of the upper connecting portion 14. A screw insertion hole 28 is provided at the center of the stepped portion 27, and option member attachment holes 29, 29 are provided at both sides thereof.

  Positioning holes 30 and 30 are provided on both sides of the recessed step portion 27 on the rear surface of the upper connecting portion 14, and stepped holes 31 and 31 are provided on both outer sides.

  The front and rear surfaces of the backrest frame 9 are provided with a large number of ribs and holes for the purpose of reinforcement and material reduction. Only those relevant to the present invention will be described, and the others. Description of is omitted.

As shown in FIG. 3 and FIGS. 9 to 13, the backrest frame 9 is formed with an inner edge of each vertical saddle 13 and extended vertically from there to an upper connecting portion 14 and a lower connecting portion. Vertical ribs 32 forming ribs on the front surface of 15 are provided.
Inside the support means (described later) for supporting both sides of the back support member 10, the back support member 10 is provided on the inner front edge of the left and right vertical rods 13, that is, on the inner front edge of each vertical rib 32. There is provided a deformation allowing portion 33 for the backrest member 10 that forms a gentle arc-shaped curved surface in which the distance from the rear surface of the backrest member 10 gradually increases from the front end surface in contact with the rear surface inward. It has been.

By making the radius of curvature of the deformation allowing portion 33 gradually smaller from the upper portion toward the lower portion, the distance between the rear surface of the backrest member 10 and the facing surface of the deformation allowing portion 33 is gradually increased upward. (See FIGS. 9 to 13).
Although illustration is omitted, the radius of curvature of the deformation allowing portion 33 is gradually increased from the upper portion toward the lower portion, and the separation dimension of the facing surface between the rear surface of the backrest member 10 and the deformation allowing portion 33 is directed downward. May be gradually increased. In addition to the arcuate curved surface, the deformation-permitting portion 33 may have, for example, a parabolic surface whose radius of curvature gradually decreases toward the inside, or a partly flat inclined surface.

  As described above, the distance from the rear surface of the backrest member 10 is gradually increased toward the inner side from the front end surface in contact with the rear surface of the backrest member 10 on the inner front edge of the vertical rib 32 in the left and right vertical rods 13. When the deformable portion 33 that increases is provided, when the backrest member 10 is pressed rearward by the back of the seated person, both the left and right sides of the backrest member 10 are elastically deformed rearward. The portion is also easily elastically deformed rearward along the deformation-permitting portion 33 with the front edge inside the vertical rod 13 as a fulcrum. Accordingly, a large difference in deformation amount between the center portion and both side portions of the backrest member 10 is less likely to occur, and the entire backrest member 10 is effectively elastically deformed rearward so that the seated person's back is comfortably supported. Become so.

  Moreover, since the deformation | transformation permission part 33 is made into the shape which makes a gentle curved surface, along with the deformation | transformation permission part 33, it becomes easy to elastically deform the backrest member 10 back, and it bends to the both sides of the backrest member 10 large Since no stress is applied, the risk of wear of the rear surface in contact with the vertical rod 13 is reduced.

  Further, the radius of curvature of the deformation allowing portion 33 is gradually decreased from the upper portion toward the lower portion, and the distance between the rear surface of the backrest member 10 and the deformation allowing portion 33 is gradually increased upward. Then, both sides of the upper portion of the backrest member 10 to which a large back load is applied are more elastically deformed rearward, so that the feeling when the backrest 6 is reclined and drowned is improved.

  On the contrary, the radius of curvature of the deformation-permitting portion 33 is gradually increased from the upper part to the lower part, and the distance between the rear surface of the backrest member 10 and the opposing surface of the deformation-permitting part 33 is reduced downward. When gradually increasing in size, the seat is deeply seated in the back of the seat 5, and when the backrest 6 is reclined in this state, the both sides of the lower part of the backrest member 10 are moved backward. Since it is easily elastically deformed greatly, the vicinity of the waist is comfortably supported.

  In each vertical rod 13, on the front surface between the vertical rib 32 and the vertical rib 34 that forms the outer surface of the vertical rod 13, the hollow groove 35 and the concave groove 20 facing in the vertical direction are parallel to each other. It has a generally forward-facing saddle-shaped cross section.

  As shown in FIGS. 3 to 5, the backrest member 10 has a substantially square shape when viewed from the front, and a plurality of small holes 36 are provided in the inner portion excluding the upper, lower, left and right edges, so that the portion is bent. In order to make it easier, plugs 37, 37, which are the second fitting portions and face in the vertical direction, are integrally provided on the rear surfaces of the left and right side portions so as to protrude rearward.

Each insertion piece 37 has a pin insertion hole 38 facing in the left-right direction at a portion corresponding to the plurality of pin insertion holes 21 in each vertical rod 13 of the backrest frame 9, and a through hole 24 in each vertical rod 13. The corresponding portions are provided with elastic engagement pieces 39 each having an inward engagement claw 39a at the rear end.
A protrusion 37a having an arc shape in a side view with the center of curvature at the center of each pin insertion hole 38 is formed at the rear portion of each pin insertion hole 38 at the rear edge of each insertion piece 37.

  A pair of left and right vertical ribs 40, 40 parallel to each insertion piece 37 is provided on the outer side of the left and right insertion pieces 37, 37 on the rear surface of the upper half of the backrest member 10. A portion corresponding to the upper three pin insertion holes 38 in each vertical rib 40 is provided with an arc-shaped notch 40a that does not hinder insertion of the pin.

As shown in FIGS. 6 to 8, a bent portion 10 a that is gently bent toward the rear upper side is formed on the upper portion of the backrest member 10, and a portion below the upper end on the rear surface of the bent portion 10 a is formed at the upper portion. In a plan view and a rear view, the crescent shape is formed, and the vertical cross-sectional shape of the central portion in the left-right direction is a forwardly convex arc shape, and the rear surface is directed downward with an acute angle with respect to the rear surface of the bent portion 10a. The facing piece 41, the rearward piece 42 that extends rearward from the lower edge of the facing piece 41, and the hanging piece 43 that hangs down from the connecting portion between the lowering piece 41 and the backward piece 42 are integrally formed. Is provided.
The downward piece 41 and the backward piece 42 extend rearward from the upper rear surface of the backrest member 10 so as to be spaced upward from the upper end of the backrest frame 9 which is a backrest support member, and A rear cover portion is formed to cover an upper portion of the space between the backrest member 10 and the backrest frame 9 and an upper portion of the backrest frame 9.
The rear piece 42 also extends on the outer side in the left-right direction of the lower piece 41, and the rear end of the outer portion is integrated with the rear surface of the bent portion 10a.

At the rear end of both sides of the rear piece 42 that is spaced apart from the hanging piece 43, there is a forward piece 44a at the lower end, and each side of the backrest member 10 is locked to the backrest frame 9 A downward engaging piece 44 is provided (see FIG. 8).
As shown in FIG. 14, the cross-sectional shape of the engagement piece 44 has a wedge shape that expands inward.

  In the central part of the hanging piece 43 in the left-right direction and on both sides thereof, screw insertion holes 28 in the upper connecting part 14 of the backrest frame 9 and option member mounting holes 29 and 29 on both sides thereof, positioning holes 30 and 30, Boss insertion holes 45, 46, 46, 47, 47, 48, 48 corresponding to the stepped holes 31, 31 are provided.

  On the front surface of the hanging piece 43, a contact plate 49 serving as a reinforcing material made of a hard synthetic resin material is disposed. The rear surface of the abutting plate 49 corresponds to the boss insertion holes 45, 46, 46, 47, 47, 48, 48 in the hanging piece 43, and a plurality of bosses 50 facing rearward that can be fitted to them from the front, 51, 51, 52, 52, 53, 53 are provided integrally.

As shown in FIGS. 8 to 13, the left and right insertion pieces 37 are inserted into the left and right concave grooves 20 on the front surface of the backrest frame 9 from the front, and the corresponding pin insertion holes 21 and pin insertion holes 38 are inserted. In the aligned state, the pins 54 are inserted into the pin insertion holes 21 and the pin insertion holes 38 from both sides of the backrest frame 9 (see FIG. 10), and the insertion pieces 37 are prevented from coming out of the concave grooves 20. Then, the elastic engagement piece 39 is fitted into the through hole 24, and the engagement claw 39a at the rear end is locked to the outer edge of the rear end of the through hole 24 (see FIG. 12). The bosses 50, 51, 51, 52, 52, 53, 53 of the contact plate 49 disposed on the front surface of the piece 43 are fitted into the boss insertion holes 45, 46, 46, 47, 47, 48, 48 in the hanging piece 43. And the bosses 52, 52, 53, 53 are connected to the upper connection part 14 of the backrest frame 9. By tightening a set screw 55 that fits into the positioning holes 30 and 30 and the stepped holes 31 and 31 and is inserted through the stepped holes 31 from the rear into a female screw hole 56 provided in the boss 53. (See FIG. 9) The backrest member 10 is firmly and stably attached to the backrest frame 9.
By the insertion piece 37, the pin 54, the elastic engagement piece 39, the protruding piece 24a, and the like, support means for supporting both sides of the backrest member 10 is formed on the left and right vertical rods 13 of the backrest frame 9. Yes.

  When each insertion piece 37 is inserted from the front into the left and right concave grooves 20 on the front surface of the backrest frame 9, each arc-shaped protrusion 37 a at the rear end of the insertion piece 37 corresponds to the backrest frame 9. By fitting into the through hole 23, each insertion piece 37 is positioned in the vertical direction with respect to the backrest frame 9.

  As shown in FIGS. 3 and 4, the heads of the upper three pins 54 to be inserted into the pin insertion holes 21 from both sides of the backrest frame 9 are connected to each other with a connecting rod 57 that is directed in the vertical direction. When each pin 54 is inserted into the pin insertion hole 21, the connecting rod 57 comes into contact with the outer surface of the backrest frame 9 as shown in FIG. 10.

Although not shown, the two pins to be inserted into the lower pin insertion holes 21 on both sides of the backrest frame 9 are also connected with the same connecting rod as the connecting rod 57, and the upper three pins 54 are connected to each other. Similarly, it is preferable to insert the pin insertion hole 21 below the backrest frame 9.
Note that the lower portion of the backrest member 10 can be securely attached to the backrest frame 9 simply by locking the engagement claw 39a of the elastic engagement piece 39 to the outer edge of the rear end of the through hole 24. The insertion of the two lower pins into the pin insertion hole 21 may be omitted.

  As shown in FIGS. 5 and 12, the engagement claw 39 a of the elastic engagement piece 39 is provided with an engagement hole 39 b that faces in the vertical direction, and the engagement claw 39 a is disposed outside the rear end of the through hole 24. When engaged with the edge, the engaging hole 39b is engaged with a rearward projecting piece 24a protruding from the outer edge of the rear end of the through hole 24 in the backrest frame 9, and the engaging claw 39a. However, it is desirable to prevent the inner hole from coming off the outer edge of the rear end of the through hole 24.

As shown in FIGS. 3 to 5 and FIG. 8, downward engaging pieces 44 provided in the upper corners of the rear surface side of the backrest member 10 in the engaging holes 26 on both sides of the upper end of the backrest frame 9. So that the front-facing piece 44a at the lower end of the engagement piece 44 can be engaged with the front edge at the lower end of the engagement hole 26. By placing, the left and right corners at the upper end of the backrest member 10 can be prevented from peeling forward from the backrest frame 9.
As an assembling procedure, the engagement pieces 44 of the backrest member 10 are fitted from above to the engagement holes 26 on both upper ends of the backrest frame 9 and engaged with the front edge of the engagement hole 26. And the forward-facing piece 44a at the lower end of the engagement piece 44 is engaged with the front edge of the lower end of the engagement hole 26, and then, as described above, the insertion piece 37 is inserted into the left and right sides on the front surface of the backrest frame 9. The backrest member 10 is attached to the backrest frame 9 by being inserted into the concave groove 20 from the front.

  As shown in FIGS. 6 and 7, when the backrest member 10 is mounted at the normal position of the backrest frame 9, the rearward piece 42 of the backrest member 10 covers the upper end of the backrest frame 9. As a result, the appearance is improved.

  The skin material 11 is formed by inserting a drawstring 58 (see FIG. 6 and subsequent drawings) through a cylindrical string passage portion 11a formed on the outer peripheral edge of a woven fabric, mesh fabric, or other upholstery material, After the outer peripheral portion is encapsulated, the drawstring 58 is tightened and tied on the rear surface side of the backrest member 10, thereby being attached to the backrest member 10. The pull string 58 may be stretchable.

  By attaching the backrest member 10 to the backrest frame 9 as described above in a state in which the skin material 11 is attached to the backrest member 10, the skin material 11 is formed on the rear surface side of both sides of the backrest member 10. In the state in which the string passage portions 11a at the terminals on both sides of the skin are engaged with the inner side of the vertical ribs 40 on the rear surface side of the backrest member 10, the string passage portions 11a in the skin material 11 extend along the outer edge of the backrest member 10. The portion of the backrest frame 9 until it is folded forward is due to the front end of the vertical rib 40 in the backrest frame 9 and the front end of the forward-facing piece 59 that protrudes slightly inward from the both side ends of the front surface of the rear cover 12. It is pushed forward toward the rear surface of the backrest member 10 to reliably prevent the both side portions of the skin material 11 from coming off the backrest frame 9 outward.

  The lower edge of the upper end portion of the backrest member 10 on the skin member 11 that is folded back to the rear surface abuts against the joint portion of the downward piece 41 and the backward piece 42 on the rear surface of the backrest member 10 (see FIG. 6), close to the rear surface of the backrest member 10 above the downward piece 41 (see FIG. 7), or contact the connecting portion between the rear surface of the backrest member 10 and the rear piece 42 (see FIG. 8). ).

  As shown in FIGS. 6 to 8, the lower edge of the skin material 11 is simply folded upward at the lower end portion of the backrest member 10.

As shown in FIGS. 3 and 4, the rear cover 12 is provided on the front surface of the rear cover 12 so as to protrude from a portion slightly below the upper end in addition to the left and right forward pieces 59, 59. , 59 and a forward-facing piece 60 extending substantially horizontally toward the front.
On the front edges of the left and right side portions of the forward piece 60, hanging pieces 61 and 61 as fitting portions are provided.
As shown in FIG. 14, the front surface of the drooping piece 61 is inclined so that the outer portion is positioned forward of the inner portion in plan view so as to be parallel to the rear surface of the engagement piece 44, and has a cross-sectional shape. However, it has a backward U-shape that opens rearward.

On both sides of the lower portion of the front surface of the rear cover 12, a fitting projection 62 having a rectangular shape in front view corresponding to the through-hole 24 in the backrest frame 9 and third engagement holes 25, 25 corresponding to the upper and lower engagement holes 25, 25 are also provided. Cylindrical engagement protrusions 63 and 63 forming a fitting part are provided to protrude.
An outward locking claw 63 a is provided at the tip of each engagement protrusion 63.

  An oval shallow recessed step 64 that faces in the left-right direction is provided at the center of the upper portion of the rear surface of the rear cover 12 in the left-right direction. A screw insertion hole 65 is provided at the center of the recessed step 64. However, option member mounting holes 66, 66 are provided on both sides thereof.

  As shown in FIGS. 8 and 14, left and right hanging pieces 61 are inserted into the engagement holes 26 on both sides of the upper end of the backrest frame 9 where the engagement piece 44 of the backrest member 10 is engaged with the front edge. As shown in FIG. 12, the engagement claw 39a of the elastic engagement piece 39 in the backrest member 10 is located at the rear end, as shown in FIG. The right and left fitting protrusions 62 are fitted in the left and right through holes 24 of the backrest frame 9 that are locked to the outer edge so that the outer side faces the inner side of the elastic engagement piece 39. 11 and 13, the engaging protrusions 63 are fitted into the corresponding stepped holes 25 in the backrest frame 9, and the engaging claws 63 a are connected to the front end edges of the stepped holes 25. Further, as shown in FIGS. 6 and 9, from the rear of the rear cover 12, a screw insertion hole 65 and a back The rear cover 12 is attached to the backrest frame 9 by screwing and tightening a set screw 67 through which the screw insertion holes 28 of the frame 9 are sequentially inserted into a female screw hole 68 provided in the boss 50 of the abutting plate 49. It is firmly and stably mounted on the rear surface.

  As shown in FIG. 10, in the state where the rear cover 12 is mounted on the backrest frame 9, the connecting rods 57 that are integral with the pins 54 are front and / or left and right forward pieces 59 on the left and right sides of the rear cover 12. And is prevented from falling off to the outside. Accordingly, the pin 54 is prevented from falling off and the backrest member 10 is prevented from dropping off from the backrest frame 9 without separately providing a dropping prevention means for preventing the pin 54 from dropping from the pin insertion hole 38. The In addition, the pins 54 can be used alone without connecting the plurality of pins 54 by the connecting rod 57, but in this case, each pin 54 is provided with an enlarged head, If the rear cover 12 can be pressed by the front surfaces on both sides, it can be prevented from falling off.

  Further, the left and right hanging pieces 61 are fitted into the engaging holes 26 on both sides of the upper end of the backrest frame 9 in which the engaging piece 44 of the backrest member 10 is engaged with the front edge as described above. As a result, the engagement piece 44 can be prevented from coming off from the engagement hole 26, and the left and right fitting protrusions 62 are connected to the engagement claws 39a of the elastic engagement piece 39 of the backrest member 10 at the rear end. By fitting the left and right through holes 24 of the backrest frame 9 locked to the outer edge as described above, the elastic engagement pieces 39 can be prevented from coming out of the through holes 24.

  A cap 69 that also serves as a name plate is detachably fitted to the recessed step 64 on the rear surface of the rear cover 12.

Since this chair is configured as described above, an engagement piece 44 that is a fitting portion of the backrest member 10 and a rear surface are formed in the engagement hole 26 that is a fitting portion provided at the upper end of the backrest frame 9. A backrest member 10 that is a fitting portion of the rear cover 12 that is a member is arranged side by side in front and back, and the backrest member 10 is placed on the front surface of the backrest frame 9 and the rear cover 12 is placed on the rear surface of the backrest frame 9. Can be easily mounted, the assembly work is easy, and the rear surface of the engagement piece 44 of the backrest member 10 fitted in the engagement hole 26 of the backrest frame 9 and the rear cover 12 Since the front surface of the drooping piece 61 is in contact with each other, the backrest member 10 and the rear cover 12 are positioned in the front-rear direction, so that it is possible to prevent the distance between them in the front-rear direction from fluctuating.
Further, since the backrest member 10 and the rear cover 12 can be attached to and detached from the backrest frame 9 independently of each other, their replacement work can be easily performed.
Furthermore, even if the backrest member 10 or the rear cover 12 is formed of a soft material, it is possible to prevent the edge portion from peeling off the backrest frame 9.

The present invention is not limited only to the above-described embodiments, and can be implemented in various modified modes as follows, for example, without departing from the scope of the claims.
(1) The fitting portion provided at the upper end of the backrest frame 9 is a bottomed recess, or a rectangular tube-like protrusion protruding upward from the upper end of the backrest frame.
(2) The width in the front-rear direction of the engagement hole 26 that is the fitted part is equal to the sum of the thickness in the front-rear direction of the engagement piece 44 that is the fitting part and the thickness in the front-rear direction of the hanging piece 61, Or slightly larger than that.
If it does in this way, the relative movement of the backrest frame 9 and the backrest member 10 of the back and front and the rear surface member with respect to the back and forth direction is prevented by fitting the front and rear fitting parts to the fitted part.
(3) The rear member is not the rear cover 12 but another member such as a decorative plate that is attached to the rear surface of the backrest frame 9 and covers only the upper or lower portion of the rear surface of the backrest frame 9.
(4) The backrest member 10 is formed of a hard material, and the rear member is formed of a soft material. In this case, it is preferable that the rear surface of the hanging piece 61 that is the fitting portion of the rear member is in contact with the rear edge of the engagement hole 26 that is the fitted portion.
(5) One of the backrest member 10 and the rear cover 12 is formed of a soft material, and the width in the front-rear direction of the engagement hole 26 that is the fitted portion is set to the front and rear of the engagement piece 44 that is the fitted portion. The thickness is slightly smaller than the sum of the thickness in the direction and the thickness in the front-rear direction of the hanging piece 61.
In this case, one of the engagement piece 44 and the hanging piece 61 is strongly pressed against the other in the fitted state of the engagement hole 26, so that the member on the side made of the soft material is removed. It can be surely prevented.
(6) Both the back support member 10 and the rear member 12 are formed of a hard material.
(7) The forward piece 44a provided on the engagement piece 44 is omitted, and the engagement piece 44, which is a fitting portion, is formed into a saddle shape that faces downward.
By doing so, the backrest member 10 can be detached from the backrest frame 9 alone without being obstructed by the rear cover 12.
(8) The fitted portion provided at the upper end of the backrest frame 9 is an engagement hole provided so as to penetrate in the front-rear direction slightly below the upper end surface of the vertical saddle 13.
(9) The forward piece 60 is omitted from the rear cover 12, and the hanging piece 61 protrudes from the front surface of the rear cover 12.
(10) The width in the left-right direction of each hanging piece 61 is substantially the same as the width in the left-right direction of the engagement piece 44 of the backrest member 10 and the width in the left-right direction of the engagement hole 26 that is the fitted portion. Almost the same or slightly smaller.

DESCRIPTION OF SYMBOLS 1 Caster 2 Leg 3 Post 4 Leg 5 Seat 6 Backrest 7 Support body 8 Backrest support rod 8a Projection 9 Backrest frame 10 Backrest member 10a Bending portion 11 Skin material 11a String passage portion 12 Rear cover (rear surface member)
13 Vertical rod 14 Upper connecting portion 15 Lower connecting portion 16 Inclined rod 17 Recess 18 Front wall 19 Bolt / nut 20 Recessed groove (second fitted portion)
21 Pin insertion hole 22 Guide groove 23 Through hole 24 Through hole 24a Projection piece 25 Stepped hole (third fitted portion)
26 Engagement hole (fitting part)
27 Indented step portion 28 Screw insertion hole 29 Optional member mounting hole 30 Positioning hole 31 Stepped hole 32 Vertical rib 33 Deformation allowance portion 34 Vertical rib 35 Thickening concave groove 36 Small hole 37 Insertion piece (second fitting portion)
37a protrusion 38 pin insertion hole 39 elastic engagement piece 39a engagement claw 39b engagement hole 40 vertical rib 40a notch 41 downward piece 42 backward piece 43 hanging piece 44 engagement piece (fitting part)
44a Forward-facing pieces 45, 46, 46, 47, 48 Boss insertion hole 49 Abutting plate 50, 51, 52, 53 Boss 54 Pin 55 Set screw 56 Female screw hole 57 Connecting rod 58 Pulling string 59, 60 Forward piece 61 Hanging piece (Fitting (Joint)
62 fitting protrusion 63 engaging protrusion (third fitting part)
63a Locking claw 64 Recessed step 65 Screw insertion hole 66 Optional member mounting hole 67 Set screw 68 Female screw hole 69 Cap

Claims (5)

Legs and
In a chair with a backrest supported by legs,
The backrest is
A backrest frame supported by the support and provided with a fitted portion at the upper end;
A backrest member attached to the front surface of the backrest frame and provided with a fitting portion on the upper rear surface for fitting to a fitted portion of the backrest frame;
Mounted on the back surface of the backrest frame and abutted with the rear surface of the fitting portion of the backrest member behind the fitting portion of the backrest member in the fitted portion of the backrest frame on the upper front surface A chair comprising: a rear member provided with a fitting portion that fits as if possible.   The chair according to claim 1, wherein one of the backrest member and the rear member is made of a soft material and the other is made of a hard material.   The mating portion is an engagement hole that opens upward provided on the upper end surface of the backrest frame, and the fitting portion of the backrest member is a downward engagement piece provided on the rear surface side upper portion of the backrest member, And the chair of Claim 1 or 2 which made the fitting part of the rear surface member the hanging piece provided in the front side upper part of the rear surface member.   A second fitting portion facing backward is provided below the fitting portion on the back surface of the backrest member, and the second fitting portion is fitted from the front to a second fitted portion provided on the front surface of the backrest frame. The chair according to any one of claims 1 to 3, wherein the backrest member is attached to the front surface of the backrest frame by combining.   A third fitting portion facing forward is provided below the fitting portion on the front surface of the rear member, and this third fitting portion is fitted to the third fitted portion provided on the rear surface of the backrest frame from the rear. The chair according to any one of claims 1 to 4, wherein the rear member is mounted on the rear surface of the backrest frame.

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