JP5902570B2 - Chair - Google Patents

Description

  The present invention relates to a chair having a flexible backrest member attached to the front side of a backrest frame.

  For example, in Patent Documents 1 and 2, a flexible backrest member (back plate) is attached to the front side of a backrest frame that stands up from the back of the seat, and the backrest member is directed rearward by the back of the seated person. A chair that can comfortably support a seated person's back by elastic deformation is disclosed.

JP 2004-129966 A JP 2008-119220 A

In the chairs described in Patent Documents 1 and 2, both the left and right side portions of the backrest frame are attached to the left and right side portions of the backrest member so as to be rotatable about the vertical axis. When the back is pressed against the backrest member, the entire backrest member can be elastically deformed rearward about the shafts on both sides.
Therefore, although the central portion of the backrest member is elastically deformed relatively rearwardly, the left and right side portions of the backrest member supported by the backrest frame via the shaft are slightly displaced rearward about the shaft. As a result, the amount of deformation is small compared to the amount of deformation at the center, and a large difference occurs in the amount of elastic deformation between the center and both sides. If it becomes like this, since the whole backrest member cannot be elastically deformed back effectively, it becomes difficult to support a seated person's back comfortably.
Further, the attachment portion of the backrest member to the backrest frame is reinforced by the shaft support means projecting on the rear surface of the backrest member or the engaging portion into which the shaft is fitted, and the rigidity of the portion is increased. Therefore, the vicinity of the attachment portion of the backrest member to the backrest frame is particularly difficult to elastically deform backward.

  The present invention has been made in view of the above problems, and by making the left and right sides of the backrest member elastically deformable rearward, the entire backrest member is effectively elastically deformed rearward with respect to the backrest frame. It is an object of the present invention to provide a chair in which the entire back of the seated person is supported more comfortably.

According to the present invention, the above-mentioned problems are solved as follows.
(1) A chair provided with a backrest frame having a pair of vertical saddles that are separated from each other on the left and right sides, and a flexible backrest member having left and right sides supported by support means on the front side of the left and right vertical saddles. In the inner side of the support means, the distance from the rear surface of the backrest member on the inner front surface of the left and right vertical rods is inward from the front end surface with which the rear surface of the backrest member abuts. A deformation allowing portion for allowing elastic deformation to the rear of the backrest member that gradually increases is provided.

  According to such a configuration, when the backrest member is pressed backward by the back of the seated person, the left and right side portions of the backrest member are also longitudinally deformed as the central portion thereof elastically deforms backward. It becomes easy to elastically deform backward along the deformation permissible portion on the inner front surface. Accordingly, a large difference in deformation amount between the center portion and both side portions of the backrest member is unlikely to occur, and the entire backrest member is elastically deformed rearward so that the seated person's back is comfortably supported. become.

(2) In the above item (1), the vertical rod has a substantially forward saddle-shaped cross section having a concave groove in the vertical direction opening forward, and both sides of the backrest member are disposed in the concave groove. The insertion piece forming a part of the support means projecting from the rear surface of the part is supported by the vertical hook so that it cannot be dropped off, and a deformation allowing portion is provided on the front face of the vertical hook located inward of the concave groove.

According to such a configuration, the backrest member is restricted from moving in the left-right direction with respect to the backrest frame, and the positional relationship between the rear surface of both side portions of the backrest member and the deformation allowing portion is kept constant. Both side portions of the back support member are easily elastically deformed rearward along the deformation allowing portion provided on the front surface of the vertical saddle than the concave groove.
In addition, when the backrest member is pressed rearward, the insertion piece that is supported so as not to fall off by the vertical hook in the concave groove is also elastically deformed inward, so that both side portions of the backrest member are deformable portions. It becomes easy to elastically deform rearward along.

(3) In the above item (1) or (2), the deformation allowing portion is provided so as to be continuous in the vertical direction of the vertical gutter.

  According to such a configuration, at any position in the vertical direction of the backrest member, both side portions thereof are easily elastically deformed rearward along the deformation allowing portion, so that the entire back of the seated person is comfortably supported.

(4) In any one of the above items (1) to (3), the deformation allowance portion is formed so that the distance from the rear surface of the backrest member gradually increases inward from the front end surface with which the rear surface of the backrest member abuts. An increasing curved surface is assumed.

  According to such a configuration, the back support member is easily elastically deformed rearward along the curved deformation allowance portion, and a large bending stress is not applied to both sides of the back support member. The risk of wear of the abutting rear surface is reduced.

(5) In the above item (4), the radius of curvature of the deformation-permitting portion is gradually reduced from the upper part toward the lower part, so that the distance between the opposing surfaces of the deformation-permitting part and the backrest member is increased upward. Gradually increase.

  According to such a configuration, both sides of the upper portion of the backrest member to which a large back load is applied are elastically deformed backward, so that the feel when the backrest member is reclined and the back is leaned is felt. Get better.

(6) In the above item (4), the radius of curvature of the deformation-permitting part is gradually increased from the upper part toward the lower part, so that the distance between the opposing surfaces of the deformation-permitting part and the backrest member is reduced downward. Gradually increase.

  According to such a configuration, when the seat is deeply seated with the buttocks positioned at the back of the seat and the backrest member is reclined in this state, the lower side portions of the backrest member are elastically deformed to the rear. Since it becomes easy to do, the waist vicinity is supported comfortably.

(7) In any one of the above items (1) to (6), the backrest member is formed of a soft material.

  According to such a configuration, since the backrest member is highly flexible, the entire backrest member is elastically deformed to a preferred shape rearward so as to follow the shape of the back of the seated person, and the entire back is rearward. It is supported more comfortably by enveloping it.

  According to the present invention, it is possible to provide a chair in which the entire back of the seated person is supported more comfortably.

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, embodiments 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 attached to 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 a ridge 8a facing in the up-down direction projecting in a U shape projecting in a plan view projecting forward on the left and right side portions of the metal plate facing in the left-right direction. 8a are bent and formed, and, as shown in FIG. 7, are fastened to the front wall 18 with bolts and nuts 19 at 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, the bottom portion of the concave groove 20 in each vertical rod 13 and a portion corresponding to the pin insertion hole 21 has a vertically long through hole penetrating in the front-rear direction. 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 are provided in the upper and lower portions sandwiching the through hole 24 on the rear surface of each vertical rod 13.

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

  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. A deformation-permitting 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 is provided continuously in the vertical direction.

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. For simplicity, plugs 37, 37 that 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 elastic engagement piece 39 which has the inward engagement claw 39a in the rear-end part is provided in the part corresponding to each.
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.
The insertion piece 37, the pin 54, the elastic engagement piece 39, the projecting piece 24a, and the like constitute support means for supporting both side portions of the backrest member 10 on the left and right vertical saddles 13 of the backrest frame 9. doing.

  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. 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.

  Further, as shown in FIGS. 6 and 7, when the backrest member 10 is attached to the regular position of the backrest frame 9, the backward piece 42 of the backrest member 10 covers the upper end of the backrest frame 9. By trying to improve the appearance.

  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.
Dripping pieces 61 and 61 are provided on the front edges of the left and right sides of the forward piece 60.
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 front-side fitting fitting 62 corresponding to the through hole 24 in the backrest frame 9 and a cylindrical shape corresponding to the upper and lower engaging holes 25, 25 are also provided. Engaging protrusions 63 and 63 are provided so as 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 side of the rear cover 12, a screw insertion hole 65 and a backrest are provided. The rear cover 12 is attached to the rear surface of 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 contact plate 49. In addition, it is firmly and stably mounted.

  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.

  In the above embodiment, the deformation allowing portion 33 is provided at the front edge of the inner vertical rib 32 in the vertical rod 13, but the vertical rod 13 is solid without the left and right vertical ribs 32, 34 or the groove 20. The deformation permitting portion 33 may be provided on the inner front surface. At this time, the insertion piece 37 of the backrest member 10 may be fixed to the outer surface of the vertical rod 13 with a screw, a pin or the like, for example.

  Moreover, in the said embodiment, although the backrest member 10 shall consist of flexible soft materials, such as an elastomer or a soft synthetic resin material, it shape | molds in plate shape with hard members, such as a polypropylene and a polyamide, It is good also as what provided many small holes in this. In this case, the flexibility of the backrest member 10 is smaller than that formed by a soft material, so that the radius of curvature of the deformation allowing portion 33 is increased or the thicknesses of both side portions of the backrest member 10 are increased. It is preferable that the flexibility of both sides of the backrest member 10 is not hindered, for example, by partially reducing the size of the backrest member 10.

  Further, in the above-described embodiment, the backrest member 10 is composed of a pair of left and right vertical saddles 13 and 13 connected to each other by an upper connecting portion 14 and a lower connecting portion 15 in the left-right direction. 9, but other than the backrest frame 9 having a frame shape, for example, all the vertical regions of the left and right vertical saddles 13, 13 are connected by a plate-like connecting member, A backrest frame having a plate shape in which the space between the vertical rods 13 and 13 is closed may be used. In this case, the front surface of the plate-like portion excluding the left and right vertical saddles 13 is positioned behind the front surface of the vertical saddle 13 so that the space between the opposing surfaces of the plate-like portion and the backrest member 10 is reduced. In addition, a space for elastically deforming the backrest member 10 backward may be provided. Thus, when the backrest frame is plate-shaped, the rear cover 12 can be omitted.

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 13 Vertical cover 14 Upper connecting portion 15 Lower connecting portion 16 Inclined flange 17 Recess 18 Front wall 19 Bolt / nut 20 Recess groove 21 Pin insertion hole 22 Guide groove 23 Through hole 24 Through hole 24a Projection piece 25 Stepped hole 26 Engagement hole 27 Recessed step Portion 28 Screw insertion hole 29 Option member mounting hole 30 Positioning hole 31 Stepped hole 32 Vertical rib 33 Deformable portion 34 Vertical rib 35 Thickening concave groove 36 Small hole 37 Insertion piece 37a Projection 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 44a forward piece 45, 46, 46, 47, 48 boss insertion hole 4 Contact plate 50, 51, 52, 53 Boss 54 Pin 55 Set screw 56 Female screw hole 57 Connecting rod 58 Pull cord 59, 60 Forward piece 61 Drooping piece 62 Fitting projection 63 Engaging projection 63a Locking claw 64 Recessed step Portion 65 Screw insertion hole 66 Optional member mounting hole 67 Set screw 68 Female screw hole 69 Cap

Claims (7)

In a chair comprising a backrest frame having a pair of vertical saddles spaced apart from each other on the left and right, and a flexible backrest member whose left and right sides are supported by support means on the front side of the left and right vertical saddles,
On the inner side of the support means, the distance from the rear surface of the backrest member on the inner front surface of the left and right vertical shafts gradually increases inward from the front end surface where the rear surface of the backrest member abuts. A chair provided with a deformation allowing portion that allows elastic deformation of the backrest member to the rear.   The vertical rod has a substantially forward saddle-shaped cross section having a concave groove in the vertical direction opening forward, and one of the supporting means projecting on the rear surface of both side portions of the backrest member in the concave groove. 2. The chair according to claim 1, wherein the insertion piece that forms a portion is supported by a downspout so as not to fall off, and a deformation allowing portion is provided on a front face of the downspout located inward of the concave groove.   The chair according to claim 1 or 2, wherein the deformation allowing portion is provided so as to be continuous in a vertical direction of the vertical fence.   4. The deformation allowing portion has a curved surface in which a separation distance from the rear surface of the backrest member gradually increases inward from the front end surface with which the rear surface of the backrest member abuts. The listed chair.   5. The distance between the opposing surfaces of the deformation-permitting portion and the backrest member is gradually increased upward by gradually decreasing the curvature radius of the deformation-permitting portion from the upper portion toward the lower portion. Chairs.   5. The distance between the opposing surfaces of the deformation-permitting part and the backrest member is gradually increased downward by gradually increasing the curvature radius of the deformation-permitting part from the upper part toward the lower part. Chairs.   The chair according to any one of claims 1 to 6, wherein the backrest member is formed of a soft material.

Images