JP5806086B2 - Chair - Google Patents

Description

  The present invention relates to a chair having a backrest.

  In the chairs described in Patent Documents 1 and 2, the backrest is fixed with screws to a pair of left and right backrest support rods of the back frame that stands up behind the seat.

In the invention described in Patent Document 3, the backrest is formed at the left and right side end portions of the backrest in a pair of left and right backrest support rods in an upward U-shaped back frame provided at the rear of the seat. It is attached by externally fitting a downward cylindrical part.
The backrest is formed by folding a thin cushion into an inverted U shape and swallowing a canvas provided with a cylindrical portion at the left and right side edges therebetween.

Japanese Utility Model Publication No. 44-9133 Japanese Utility Model Publication No. 49-38508 Japanese Utility Model Publication No. 60-38919

In the inventions described in Patent Documents 1 and 2, since the backrest is attached to the backrest support rod of the back frame with a screw from the back of the backrest with the lower end portion floating, the lower end of the backrest The support of the part is unstable.
Moreover, since the head of the screw is exposed on the rear surface of the backrest, the appearance is poor.

In the invention described in Patent Document 3, as in Patent Documents 1 and 2, the backrest is formed by removing the cylindrical portions at both ends of the backrest from the backrest support rod of the back frame in a state where the lower end portion is floating. Since it is attached by fitting, the support of the lower end of the backrest is unstable.
Further, since it is necessary to simultaneously fit the cylindrical portions on both side ends of the backrest to the left and right backrest support rods of the back frame, the installation work is troublesome and the number of work steps increases.
Furthermore, it takes time and effort to form the cylindrical portions at both ends of the backrest, and the number of processing steps increases.

  The present invention has been made in view of the above problems, can stably support the lower end portion of the backrest, can reduce the work man-hours and manufacturing man-hours of the backrest mounting work, and has an appearance. An object is to provide a chair that can improve performance.

According to the present invention, the above problem is solved as follows.
(1) A backrest support rod having a rear end portion disposed behind the seat, a horizontal frame fixed to the rear end portion of the backrest support rod, and a left and right side of the horizontal frame. A backrest support frame having a pair of upright frames rising from the side ends of the backrest, a lower portion is fitted into the backrest support frame, and a lower end portion is brought into contact with the lateral frame, and a lower end portion and Both side ends thereof are respectively provided with a lateral frame and a backrest fixed to the standing frame, and left and right side ends at a lower part of the backrest are screwed through from the outside of the standing frame. It is assumed that a cover that covers the head of the screw is detachably provided on the outer surface of the standing frame, and is fixed to the standing frame by a screw inserted into the standing frame.

With such a configuration, the lower end portion of the backrest and both side end portions thereof are fixed to the backrest support frame attached to the backrest support rod, so that the lower end portion of the backrest can be stably supported.
Further, since the backrest can be disposed at a fixed position simply by fitting the backrest into the backrest support frame, the mounting work can be facilitated and the number of work steps can be reduced. Furthermore, it is possible to prevent back-shifting and dislocation.
In addition, the left and right side edges of the lower part of the backrest can be securely fixed to the standing frame, and the cover for concealing the screw head is provided on the standing frame, so that the screw head is exposed. The appearance can be improved.

  In addition, since it is not necessary to perform special processing for attaching the backrest to the backrest support rod, the number of man-hours for manufacturing the backrest can be reduced.

(2) In the above item (1), the width in the front-rear direction of the upper surface of the horizontal frame of the backrest support frame is made substantially the same as the width in the front-rear direction of the lower end surface of the backrest.

With such a configuration, the lower end portion of the backrest can be stably supported by the horizontal frame of the backrest support frame.
In addition, the lateral frame of the backrest support frame does not protrude before and after the backrest, so that the appearance is good.

(3) In the above item (1) or (2), the lower end of the backrest is fixed to the horizontal frame with a screw inserted into the screw insertion hole from below the horizontal frame.

  With such a configuration, the lower end of the backrest can be securely fixed to the lateral frame of the backrest support frame.

(4) In any one of the above items (1) to (3), the backrest includes a backrest main body and a skin material that covers the surface of the backrest main body. Are held by the backrest main body and the upright frame of the backrest support frame.

  With such a configuration, the skin material can be prevented from being displaced or detached.

(5) In the above item (4), the skin material is formed in a bag shape having an opening at the lower end, and the opening of the skin material is concealed by the lateral frame of the back support frame.

  With such a configuration, since the opening of the skin material is not exposed, the appearance can be further improved.

(6) In any one of the above items (1) to (5), recesses for fitting the standing frame of the backrest support frame are provided on the left and right side surfaces of the lower portion of the backrest support frame.

  With such a configuration, the backrest and the standing frame can be easily positioned, and the back and forth rattling between the backrest and the standing frame can be eliminated.

(7) In the above item (6), the standing frame in the backrest support frame and the recess in the backrest to which it is fitted are gradually widened from the top to the bottom.

  With such a configuration, by inserting the backrest into the backrest support frame from above, the lower part of the backrest can be easily positioned on the backrest support frame, so that the installation work is facilitated.

(8) In any of the above items (1) to (7), the backrest support rod is pivotally supported by a left-right pivot provided on a support base that supports the seat, and the backrest can be tilted in the front-rear direction. To be.

  With such a configuration, a chair having a backrest that can be tilted in the front-rear direction can exhibit the same effect as the above item (1).

  According to the present invention, it is possible to stably support the lower part of the backrest, to reduce the work man-hours for manufacturing the backrest and the manufacturing work man-hours, and to prevent the backrest from being displaced and detached. Further, a chair that can improve the appearance can be provided.

It is a front view of the chair which is one embodiment of the present invention. Similarly, it is a side view. Similarly, it is an exploded perspective view of a backrest. Similarly, it is a front view of a backrest. FIG. 5 is an enlarged cross-sectional plan view taken along line VV in FIG. 4. It is the VI-VI line expansion vertical side view of FIG. It is a front view of the chair which attached the modification of the backrest. Similarly, it is a side view.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, this chair is provided with a leg 3 having five leg rods 2 each having a caster 1 at the tip, and a center of the leg 3, and a gas is formed inside. A telescopic leg column 4 in which a spring (not shown) is accommodated; a support base 5 facing the front upper side with a rear end fixed to the upper end of the leg post 4; a seat 6 supported by the support base 5; A backrest support body 8 pivotally attached to the support base 5 with a shaft 7 whose front end portion is directed in the left-right direction, and a backrest 9 supported on the rear upper part of the backrest support body 8 are provided.

  The support base 5 has a substantially rectangular box shape in plan view that is long in the front-rear direction, and inside thereof, via a back support 8, biasing means for constantly biasing the back 9 toward the front, The adjusting means (all not shown) for adjusting the urging force of the urging means is accommodated. In addition, since such an urging | biasing means and an adjustment means are not directly related to this invention, those detailed description is abbreviate | omitted.

  As shown in FIG. 2, the backrest support 8 is pivotally attached at its front end to both sides of the support base 5 by a shaft 7 so that the center in the front-rear direction protrudes downward in a side view. A pair of left and right backrest support rods 12 and 12 which are gently curved in an arc shape and whose rear end portions are disposed behind the seat 6, and are fixed to the rear end portions of both backrest support rods 12 and 12. And a backrest support frame 11.

  As shown in FIG. 3, the backrest support frame 11 includes a lateral frame 11 a that is fixed to the rear end portion of the backrest support rod 12 and faces in the left-right direction, and a pair of left and right standing frames that are connected to both side ends. 11b and 11b, and is formed in a substantially U shape when viewed from the front. The back support frame 11 is made of, for example, aluminum or an alloy thereof.

  The horizontal frame 11a is gently curved in an arc shape so that the central portion in the left-right direction protrudes rearward in plan view, and both side portions are inclined obliquely upward in front view (see FIG. 4). The width in the front-rear direction of the upper surface of the horizontal frame 11 a is formed substantially the same as the width in the front-rear direction of the lower end surface of the backrest 9. As shown in FIG. 4, a pair of left and right fitting holes 13, 13 that open to the front are provided in the left and right sides of the horizontal frame 11 a. The end portions are fitted and fixed as follows.

In order to assemble, first, the rear end portions of the left and right backrest support rods 12 and 12 are fitted to the pair of left and right fitting holes 13 and 13 of the horizontal frame 11a without any backlash.
Next, bolts 15 and 15 are inserted from above into two mounting holes 14 and 14 provided on the upper surface at positions corresponding to the left and right fitting holes 13 in the horizontal frame 11a, and the lower ends of both bolts 15 are The backrest support rod 12 is tightened by being screwed into two left and right female screw holes 16, 16 provided at the rear end of the backrest support rod 12. Accordingly, the rear end portions of the left and right backrest support rods 12 and 12 are firmly fixed to the horizontal frame 11 a of the backrest support frame 11.

  As shown in FIG. 3, the left and right standing frames 11 b and 11 b are inclined obliquely forward and upward so as to face the same direction as the lower part of the side surface of the backrest body 17 described later. Each standing frame 11b is formed so as to gradually become wider from the upper side to the lower side in a side view.

  The backrest 9 includes a backrest body 17 made of a hard synthetic resin having a substantially square front shape, a cushion body 18 disposed on the front surface of the backrest body 17, and a skin covering the backrest body 17 and the cushion body 18. And a material 19.

  The backrest body 17 is gently bent in a square shape in a side view so that a portion slightly below the center in the vertical direction protrudes forward in a side view. Further, the portions below the bent portions at the left and right side end portions of the backrest body 17 are inclined in the same direction as the upright frame 11 b of the backrest support frame 11. A large number of ribs 20 are vertically and horizontally provided on the front surface of the backrest body 17 over the entire surface.

  A pair of left and right fitting recesses 21 that are open downward and outward and into which the left and right upright frames 11b of the backrest support frame 11 are fitted are formed in the lower portions of the left and right side surfaces of the backrest body 17. Is formed. The opening of the fitting recess 21 is formed so as to gradually become wider from the upper part to the lower part so as to complement the standing frame 11b of the back frame 11.

  The cushion body 18 is formed in a rectangular plate shape substantially the same as the backrest body 17 by an elastic body such as urethane foam, and is bent in a dogleg shape in a side view, and a portion below the bent portion is The backrest 17 is inclined in the same direction as the lower portion of the main body 17.

  The skin material 19 is formed into a flat bag shape in front and back by canvas fabric or the like, and at its lower end, belt-like bent pieces 19a and 19a are provided with the front and rear portions folded inward, and the bent pieces 19a and 19a In the middle, an opening 19b for covering the skin material 19 on the backrest body 17 and the cushion body 18 is formed. On both side surfaces of the lower part of the skin material 19, vertically long cuts 19 c are provided.

  After covering the skin material 19 on the backrest main body 17 and the cushion body 18, the bent pieces 19a, 19a at the lower end are fixed to the lower end surface of the backrest main body 17 by a tacker, and the cuts 19c, 19c in the skin material 19 are The opening edge 19d is fixed to the inner surface of the fitting recess 21 of the backrest main body 17 by a tacker.

  In order to attach the backrest 9 to the backrest support frame 11, the backrest 9 is fitted into the backrest support frame 11 from above, and the fitting recess 21 provided on the outer surface of the lower portion of the backrest body 17 is fitted into the back of the backrest support frame 11. The left and right upright frames 11 b and 11 b of the back support frame 11 are externally fitted, and the lower end surface of the back back 9 is brought into contact with the upper surface of the horizontal frame 11 a so that the back back 9 is temporarily supported by the back support frame 11.

Next, as shown in FIGS. 3 and 5, the upper and lower screw insertion holes 22 provided in the left and right standing frames 11 b and the upper and lower ones in the left and right directions provided in the back surfaces of the left and right fitting recesses 21 of the backrest body 17. The bolts 24 inserted into the pair of mounting holes 23 are screwed into the square nuts 25 that are locked by the portions (ribs, wall surfaces, etc.) of the backrest body 17 in the vicinity of the mounting holes 23 and tightened. The lower part of the sag 9 is fixed to the left and right standing frames 11b.
In the present embodiment, the opening edge 19d of the cut 19c in the skin material 19 is disposed between the inner side surface of the fitting recess 21 and the outer side surface of the upright frame 11a. Further, it may be held between the back surface of the fitting recess 21 and the standing frame 11b.

Next, as shown in FIG. 6, a bolt 27 inserted from below into a pair of left and right mounting holes 26 provided at the center in the left and right direction of the horizontal frame 11 a is provided at the lower end of the backrest body 17. The lower end portion of the backrest 9 and the lateral frame 11a are fixed to each other by screwing into a square nut 29 that is inserted into the attachment hole 28 and is prevented from rotating by a portion near the attachment hole 24 and fitted.
As a result, the backrest 9 is firmly fixed to the backrest support frame 11 with its lower end surface in contact with the lateral frame 11b of the backrest support frame 11.
Further, the opening 19b at the lower end of the skin material 19 in the backrest 9 is concealed by the horizontal frame 11a.

After the backrest 9 is fixed to the backrest support frame 11, as shown in FIGS. 3 and 5, the cover members 30 and 30 are fitted to the outer surfaces of the left and right standing frames 11 b and 11 b. The cover member 30 is made of metal or synthetic resin, like the back support frame 11.
The cover member 30 is provided with a vertically long plate-shaped upward piece 31 and an inward piece 32 that is provided at the lower end thereof so as to follow the inclined surfaces of the lower surfaces of both sides of the backrest support frame 11 and is inclined obliquely inward and downward. And.
At the lower part of the inner side surface of the upward piece 31, a locking piece 31b facing inward having a protruding piece 31a facing backward at the tip is provided. An inwardly facing locking piece 32b is provided at the inner end of the inwardly facing piece 32 and has a protruding piece 32a facing downward at the tip.

On the outer side surfaces of the left and right upright frames 11b and the horizontal frame 11a in the backrest support frame 11, vertical recesses 33 that complement the cover member 30 are formed.
The cover member 30 includes a protruding piece 31a of the locking piece 31b in the upward piece 31, and a protruding piece 32a of the locking piece 32b in the inward piece 32, and a horizontal frame 11a and a standing frame 11b in the backrest support frame 11, respectively. The engaging groove is fitted in the recess 33 so as to be engaged with an engaging groove provided in the vicinity of the continuous portion and an engaging groove provided in the lower portion of the horizontal frame 11a (both not shown). Thereby, it attaches to the backrest support frame 11 so that attachment or detachment is possible.
The outer surface of the cover member 30 is substantially flush with the outer surface of the upright frame 11b.

By detachably attaching the cover member 30 to the outer surface of the standing frame 11b, the following effects can be obtained.
(1) It is possible to eliminate the positional displacement and backlash of the cover member 30 in the front-rear direction.
(2) Since the outer surface of the cover member 30 is substantially flush with the outer surface of the upright frame 11b, no step is generated between the cover member 30 and the upright frame 11b, and dust or the like accumulates therebetween. Thus, it is possible to prevent the occurrence of dirt.
(3) When the cover member 30 is made of synthetic resin, the area exposed by the metal portion of the standing frame 11b can be reduced, so that when the seated person turns his hand or arm backward, the standing member 11 stands up. It is possible to reduce the possibility of feeling uncomfortable by touching the metal portion of the frame 11b.
(4) When the cover member 30 is made of synthetic resin, for example, the cover member 30 has a large thickness in the left-right direction, and the depth in the left-right direction of the recess 33 of the standing frame 11b is small, or Even if the outer surface of the cover member 30 protrudes from the outer surface of the standing frame 11b due to the reason that the concave portion 33 is not provided and the cover member 30 is fixed to the outer surface of the standing frame 11b by other fixing means. The effect similar to (3) can be produced more effectively.

  7 and 8 show a chair with a modified backrest. In the following description, common parts with the chair of the above embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The backrest 34 of the chair includes a backrest main body 35 having a rectangular frame shape, and a skin material 36 made of a mesh-like tension material stretched on the front surface thereof.
In order to attach the backrest 34 to the backrest frame 11, the lower frame member 37 in the backrest main body 35 is fixed to the horizontal frame 11a of the backrest frame 11, and the left and right side frame flanges 38 in the backrest main body 35 are fixed to the standing frame 11b. It sticks to.

DESCRIPTION OF SYMBOLS 1 Castor 2 Leg 3 Leg 4 Pillar 5 Support 6 Seat 7 Axis 8 Back support 9 Back support 11 Back support frame 11a Horizontal frame 11b Standing frame 12 Back support support 13 Fitting hole 14 Mounting hole 15 Bolt 16 Female thread hole 17 Backrest body 18 Cushion body 19 Skin material 19a Bending piece 19b Opening 19c Notch 19d Opening edge 20 Rib 21 Fitting recess 22 Screw insertion hole 23 Mounting hole 24 Bolt 25 Square nut 26 Mounting hole 27 Bolt 28 Mounting hole 29 Square nut 30 Cover member 31 Upward piece 31a Projection piece 31b Locking piece 32 Inward piece 32a Projection piece 32b Locking piece 33 Recess 34 Backrest 35 Backrest body 36 Skin material 37 Lower frame material 38 Side frame collar

Claims (8)

A back support heel with a rear end disposed behind the seat;
A backrest support frame having a lateral frame fixed to a rear end portion of the backrest support rod and facing in the left-right direction, and a pair of standing frames standing upright from left and right side ends of the lateral frame;
The lower part is fitted into the backrest support frame, and the lower end part and both side end parts thereof are respectively connected to the horizontal frame and the standing frame of the backrest support frame so that the lower end part is brought into contact with the horizontal frame. With a fixed backrest,
A cover that secures left and right side end portions of the lower part of the backrest to the standing frame by screws inserted from the outside of the standing frame through screw insertion holes, and conceals the screw heads on the outer surface of the standing frame. A chair characterized in that it is detachably provided.   The chair according to claim 1, wherein the width in the front-rear direction of the upper surface of the lateral frame of the backrest support frame is substantially the same as the width in the front-rear direction of the lower end surface of the backrest.   The chair according to claim 1 or 2, wherein a lower end portion of the backrest is fixed to the horizontal frame by a screw inserted through a screw insertion hole from below the horizontal frame. The backrest has a backrest main body and a skin material covering the surface of the backrest main body, and the left and right side end portions of the lower skin material are connected to the backrest main body and the backrest support frame. The chair according to claim 1, which is held by a standing frame.   The chair according to claim 4, wherein the skin material is formed in a bag shape having an open lower end, and the opening of the skin material is concealed by a lateral frame of a backrest support frame.   The chair according to any one of claims 1 to 5, wherein a concave portion into which the upright frame of the backrest support frame is fitted is provided on both left and right end surfaces of the lower portion of the backrest.   The chair according to claim 6, wherein the standing frame in the back support frame and the recess in the back seat into which the back frame is fitted gradually become wider from the top to the bottom.   The chair according to any one of claims 1 to 7, wherein the backrest support rod is pivotally supported by a pivot shaft facing a left-right direction provided on a support base that supports the seat, and the backrest is tiltable in the front-rear direction.

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