JP2012095933A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair configured to readily prevent the upward movement of a backrest fitted to backrest-supporting rods without using fixing means such as a screw, and with considerably reduced man-hours for assembly.SOLUTION: The chair is formed by fitting the backrest 3 to the backrest-supporting rods standing from the rear part of a leg body for supporting a seat 2, from above to support the backrest. In the chair, the backrest 3 has lower ends provided with projecting pieces 19 and 19 projecting downward toward the rear end of the seat 2, the lower surface of the rear end of the seat 2 abuts on the upper surfaces of the projecting pieces 19, and the seat 2 is fixed to the upper part of the leg body.

Description

  The present invention relates to a chair in which the backrest is supported by a backrest support rod that stands up from a leg, and the seat is supported by a seat support rod that is substantially horizontal above the leg.

This type of chair is often used in a conference room or the like, in which a leg and a back support rod are formed by bending a metal pipe.
In such a conventional chair, for example, as described in Patent Documents 1 to 3, a pair of left and right backrest support rods that stand on the left and right sides of the lower portion of the backrest from the rear portion of the leg. And the lower surface of the right and left sides of the seat are supported by a seat support rod comprising a pair of left and right pipes that are substantially horizontal to the upper part of the leg.

Japanese Patent No. 4441096 Japanese Patent No. 3595714 JP 2007-202591 A

In the chairs described in Patent Documents 1 to 3, the backrest and the seat are separately attached to the backrest support seat and the seat support saddle, respectively, and the backrest is attached. The left and right sides of the lower part are supported by being fitted to a pair of left and right back support ridges that stand up from the rear of the leg, so that the back can be removed from the back support heel or vertically It is necessary to fix the backrest and the backrest support ridge with a fixing means such as a screw so as not to be displaced.
However, when fixing means such as screws are used, it is necessary to provide screw insertion holes, female screw holes, and the like in the backrest and backrest support rod, which increases the number of processing steps and the number of attachment steps of the backrest.
Moreover, since the head of the screw is exposed to the outside, the appearance of the chair is deteriorated.

  The present invention has been made in view of the above problems, and it is easy to move the backrest fitted to the backrest support rod upward without using a fixing means such as a screw and with very few man-hours. The object is to provide a chair that can be prevented.

According to the present invention, the above-mentioned problems are solved as follows.
(1) In a chair formed by fitting a backrest supporting heel standing up from a rear portion of a leg that supports a seat, and supporting the backrest by fitting a mounting hole that opens downward from above, the backrest A projecting piece projecting downward from the seat is provided at the lower end of the seat, and the lower surface of the rear end of the seat is brought into contact with the upper surface of the projecting piece so that the seat is supported on the upper portion of the leg.

With such a configuration, the upper surface of the projecting piece at the lower end of the backrest is pressed down by the lower surface of the rear end of the seat supported by the legs, so that the backrest is fitted to the backrest support ridge from above. However, there is no fear that the backrest moves upward, and therefore it is not necessary to fix the backrest using fixing means such as screws.
Further, the upward movement of the backrest can be easily prevented with a very small number of man-hours such that the lower surface of the rear end of the seat is brought into contact with the upper surface of the projecting piece at the lower end of the backrest.

(2) In the above paragraph (1), the backrest support ridges are a pair of left and right standing upright on both sides of the seat, and the backrest is provided with a downward projection at the lower end connected to both backrest support ridges. On the upper surface of the projecting piece projecting from the upper side of the left and right side portions of the left and right mounting portions, the mounting holes opening downward from the downward projecting portions provided on the left and right lower projecting portions are provided. The lower surfaces of the rear side portions are brought into contact with each other.

  With such a configuration, the backrest can be stably supported by the pair of left and right backrest support ridges, and the upper surfaces of the left and right pair of projecting pieces projecting from the lower ends of the left and right downward projections are Since it is pressed by the lower surfaces of both sides of the back of the seat, there is little risk of the backrest wobbling in the left-right direction, which stabilizes.

(3) In the above (2), the rear end of the seat is fitted between the opposing surfaces or the outer surfaces of the left and right downward projections, and the upper surfaces of the projections of the both downward projections are The lower surface of both sides of the seat is brought into contact.

  With such a configuration, the rear end portion of the seat is positioned in the front-rear and left-right directions by the left and right downward projections, so that the seat can be easily attached to the leg and the seat moves in the left-right direction. Therefore, there is no possibility that the left and right projecting pieces come into contact with the fixed positions on the lower surfaces of both side portions of the seat, and the projecting pieces are displaced and removed.

(4) In the above item (2) or (3), the upper parts of a pair of left and right rear leg rods facing the vertical direction in the leg are connected by connecting rods facing the left and right direction, A portion protruding upward from the connecting rod is a pair of left and right backrest supporting rods.

  With such a configuration, the rigidity of the rear part of the leg is increased, and the upper part of the rear leg ridge is used as a back support heel, so that the support strength of the back is increased and this is more stable.

(5) In the above item (4), the lower surfaces of the left and right downward projections on the backrest are brought into contact with the upper surfaces of both side portions of the connecting rod.

  With such a configuration, since the backrest is prevented from moving in the vertical direction, the backrest becomes more stable.

According to the present invention, since the upper surface of the projecting piece at the lower end of the backrest is pressed down by the lower surface of the rear end of the seat fixed to the leg, the backrest can be fitted only to the backrest support ridge from above. Therefore, there is no fear that the backrest moves upward, and therefore it is not necessary to fix the backrest using fixing means such as screws.
Further, the upward movement of the backrest can be easily prevented with a very small number of man-hours such that the lower surface of the rear end of the seat is brought into contact with the upper surface of the projecting piece at the lower end of the backrest.

It is a front view of the chair of the 1st Embodiment of the present invention. Similarly, it is a side view. Similarly, it is a perspective view. Similarly, it is an exploded perspective view. FIG. 5 is an enlarged longitudinal sectional front view of a main part taken along line VV in FIG. 2. Similarly, it is an enlarged vertical front view along the VI-VI line. It is the expansion perspective view which looked at the lower part of the backrest from diagonally downward. It is the expansion perspective view which looked at the state which linked the rear part of the seat and the lower part of the backrest from the lower part. FIG. 2 is an enlarged longitudinal sectional view taken along line IX-IX in FIG. 1. It is a perspective view of the chair of the 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 4, the chair according to the first embodiment of the present invention includes a leg body 1, a seat 2, a backrest 3, and a pair of left and right armrests 4 and 4.

  The leg 1 connects a pair of left and right side legs 5 and 5 formed by bending a metal pipe into a substantially trapezoidal shape when viewed from the side, and opposing surfaces of the front upper ends of the left and right side legs 5 and 5. Between the left and right side legs 5, 5 that connect the rear upper ends of the left and right side legs 5, 5, and the sheet metal front connection rod 6 having a U-shaped cross section (see FIG. 9). It consists of a rear connecting rod 7 made of a metal pipe slightly longer than the left and right widths. A plurality of right and left locking pieces 6 a that can be locked to the lower surface of the front end portion of the seat 2 are projected forward from the front upper edge of the front connecting rod 6.

  Short bent portions 5b and 5b are continuously provided inwardly facing the rear end portions of the upper leg rods 5a and 5a facing the rear at the upper portions of the left and right side legs 5 and 5, respectively. The left and right side legs 5 and 5 are formed in a substantially trapezoidal shape when viewed from the side by welding the rear surface of 5b to the lower front part of the both end portions of the rear connecting rod 7. The left and right upper leg rods 5a, 5a, the front connecting rod 6, and the rear connecting rod 7 constitute a substantially horizontal and planar-view rectangular frame-shaped seat supporting rod 8 that supports the lower surface of the seat 2. ing.

Upper portions of the rear leg rods 5 c and 5 c facing the vertical direction in the left and right side legs 5 and 5 are connected by a rear connection rod 7. That is, by inserting the upper part of the rear leg bar 5c into the vertical through holes 7a (see FIG. 5) provided on both sides of the rear connecting bar 7, and fixing them by welding or the like, the rear leg bar 5c, 5c The upper parts are connected to each other by a rear connecting rod 7. In this way, when the upper portions of the rear leg rods 5c and 5c are connected by the rear connecting rod 7, the left and right positions of the rear leg rods 5c and 5c can be easily positioned by the rear connecting rod 7, and they are firmly connected. can do.
Portions protruding upward from the rear connecting rod 7 are backrest supporting rods 9 and 9 for supporting both side portions of the backrest 3.

Fixing brackets 10 for fixing the lower surface of the seat 2 to the leg 1 are provided on the lower surfaces of the rear portions of the left and right upper leg rods 5a and 5a and the left and right bent portions 5b and 5b. It is fixed by welding so as to protrude inside.
In the left and right opening ends of the rear connecting rod 7, a non-circular cross-section capable of supporting the lower end of the armrest 4, that is, an L-shaped armrest support bracket 11 having an upwardly projecting portion 11a in the form of a square axis and facing inward. 11 are fixed by press fitting or welding (the mounting procedure of the armrest will be described later).

  The seat 2 is stretched in the frame of the seat frame 12 by integrally forming an outer peripheral edge on the inner peripheral surface of the seat frame 12 and a seat frame 12 having a rectangular frame shape made of hard synthetic resin. The mesh-shaped flexible seat plate 13 is elastically deformable downward. A rearward projecting portion 14 a is continuously provided at the center in the left-right direction at the rear end of the seat frame 12 by forming notches 14, 14 at the left and right rear corners of the seat frame 12.

Similar to the seat 2, the backrest 3 is made of a rigid synthetic resin back frame 15 having a square frame shape in front view, and a mesh-like flexible body that is stretched integrally in the frame and elastically deformable in the rear. It consists of a flexible back plate 16, and the middle part in the vertical direction of the back frame 15 is curved in a forward “ku” shape in a side view.
On the lower part of the left and right side frames 15a, 15a of the back frame 15, a pair of left and right downward projections 17, 17 that can be fitted into the notches 14, 14 of the seat 2 project integrally. It is installed. The lower surfaces of both downward projections 17 are curved in an upward arc shape so that they can be fitted to both end portions of the rear connecting rod 7 from above.

  As shown in FIGS. 5 and 7, in the lower part of the left and right side frames 15 a, 15 a in the back frame 15, vertical mounting holes 18 that can be fitted to the left and right backrest support rods 9, 9 described above, 18 is formed so as to penetrate downward projections 17 and 17 and open downward.

  As shown in FIGS. 6 to 8, the upper surface is on the inner side surface of the lower side of the downward projections 17, 17 of the left and right side frames 15 a, 15 a slightly closer to the front, and the lower surfaces of the rear side portions of the seat 2. That is, the projecting pieces 19 and 19 that prevent the backrest 3 from moving upward by abutting against the lower surfaces of both side portions of the rearward projecting portion 14a described above are provided so as to face each other inwardly.

The left and right armrests 4 and 4 are a prismatic mounting base portion 4a facing in the vertical direction, and a flat plate-like elbow rest that is connected to the upper end of the mounting base portion 4a as a forward direction and whose rear end portion is bent slightly outward. It consists of part 4b, and the whole is integrally molded by the synthetic resin.
As shown in FIG. 5, a mounting hole 20 having a rectangular cross section that opens downward and can be fitted to the upward projecting portion 11 a of the armrest support bracket 11 is formed at the lower end portion of the mounting base portion 4 a. In order to save the molding material, a plurality of upper and lower hollow portions 21 are formed.
Further, the lower end portion of the shaft-like mounting bracket 23 in which a female screw hole 22 facing in the left-right direction for bolting the mounting base portion 4a of the armrest 4 is formed at the opening end portion of the upper portion of the backrest support rod 9. Is press-fitted. In addition, without attaching such a mounting bracket 23, a female screw hole in the left-right direction may be provided directly on the upper portion of the backrest support rod 9 that is slightly longer.

  In order to assemble the chair, first, the left and right back support rods 9, 9 are provided with mounting holes 18 at the lower portions of the left and right side frames 15 a, 15 a in the backrest 3. The lower back surface is fitted from above until the lower end surface comes into contact with the upper surfaces of both side end portions of the rear connecting rod 7, and the backrest 3 is supported by the left and right backrest supporting rods 9,9.

  Next, as shown in FIG. 5, the mounting base 20 is fitted to and supported by the upper protrusions 11 a of the left and right armrest support brackets 11 from the upper end of the mounting base 4 a of the armrest 4 from above. A mounting bracket that is attached to the upper end of the backrest support rod 9 by inserting a bolt 25 inserted from the outside into the stepped hole 24 at the upper end of 4a through a through hole 26 provided in the lower side surface of the side frame 15a. 23 is screwed into the female screw hole 22. Thereby, the armrest 4 is fixed to the outer surface of the side frame 15 a of the backrest 3, and at the same time, the side frame 15 a of the backrest 3 is also fixed to the backrest support rod 9 by the common bolt 25.

  After the backrest 3 and the armrest 4 are attached as described above, as shown in FIG. 9, the seat frame 12 is attached to the left and right engaging pieces 6 a that project forward from the front connecting rod 6 of the leg 1. A plurality of left and right engaging grooves 27 formed on the rear surface of the front end portion of the rear end of the front end portion are fitted and locked from the front side, and the entire seat 2 is secured. It is mounted on the upper surface of the seat support rod 8 that forms a frame shape on the upper part of the leg 1 so as to be fitted between the opposing surfaces of the downward projections 17, 17. When the seat 2 is placed on the seat support rod 8 in this way, as described above, the rear projecting portion 14a is formed on the upper surface of the projecting pieces 19 and 19 projecting from the lower facing surfaces of the both downward projecting portions 17. The lower surfaces of both sides abut (see FIGS. 6 and 8).

  As described above, when the rearward protrusion 14a of the rear end of the seat 2 is fitted between the opposing surfaces of the downward protrusions 17 and 17, the rear end of the seat 2 becomes the leftward and rightward downward protrusions. Since the seat 2 is positioned in the front-rear and left-right directions by 17, attachment of the seat 2 to the leg 1 is facilitated and the seat 2 is restricted from moving in the left-right direction. It is possible to prevent the projecting piece 19 from being displaced due to contact with a fixed position on the lower surfaces of both side portions. In addition, the recessed part which dents ahead is provided in the rear end of the seat 2, and this recessed part is fitted between the outer surfaces of the left and right downward projecting parts 17 and 17, and the rear end part of the seat 2 is You may make it position in the front-back, left-right direction by the direction protrusion part 17. FIG.

With the seat 2 positioned as described above, the seat frame is attached to the four fixing brackets 10 fixed to the rear portions of the left and right upper leg rods 5a and 5a and the lower surfaces of the left and right bent portions 5b and 5b. The lower surface of the rear side portions of the rear 12 and the lower surfaces of both side portions of the intermediate portion in the front-rear direction are fixed by screws 28 inserted from below (see FIG. 9). Thereby, the seat 2 is stably attached to the upper part of the leg 1.
When the seat 2 is fixed to the upper part of the leg 1, as shown in FIG. 6, the seat frame 12 The lower surfaces of both side portions of the rear end portion are pressed against each other, and the lower end portions of the left and right downward projecting portions 17 are pressed from above. Therefore, even if the bolt 25 is loosened, the backrest 3 is prevented from moving upward or rattling in the vertical direction. When seated on the seat 2, a downward load is applied to the seat 2, and the left and right protrusions 19 are pressed by the rear end portion of the seat 2 due to the downward load, so that the seat 2 is placed on the upper portion of the leg 1. It may be only supported.

FIG. 10 shows a second embodiment of the chair of the present invention, which is obtained by removing only the armrest 4 from the chair of the first embodiment.
When the armrest 4 is removed, the backrest support rod 9 and the backrest 3 are not fixed by the bolts 25. However, as described above, the projecting pieces projecting from the lower ends of the left and right downward projecting portions 17 of the backrest 3 Since 19 is pressed by the lower surfaces of both side portions of the rear end portion of the seat frame 12, the backrest 3 does not move upward or shake up and down. The through-hole 26 provided in the side frame 15a of the backrest 3 may be hidden by fitting a cap 29, and the armrest support bracket 11 needs to be attached to the left and right opening ends of the rear connecting collar 7. Therefore, it is only necessary to attach the cap 29 to both ends of the opening and blindfold them.

  In addition, it cannot be overemphasized that the position and number of the protrusions 19 provided in the lower end part of the backrest 3 and the contact position between the protrusions 19 and the lower surface of the rear end part of the seat 2 are not limited to the above embodiment.

DESCRIPTION OF SYMBOLS 1 Leg 2 Seat 3 Backrest 4 Armrest 4a Mounting base 4b Elbow rest 5 Side leg 5a Upper leg 5b Bending part 5c Rear leg 6 Front connection 6a Lock piece 7 Rear connection 7a Through hole 8 Seat Support rod 9 Back support rod 10 Fixing bracket 11 Armrest support bracket 11a Upward projecting portion 12 Seat frame 13 Flexible seat plate 14 Notch portion 14a Backward projecting portion 15 Back frame 15a Side frame 16 Flexible back plate 17 Downward protrusion 18 Mounting hole 19 Projection piece 20 Mounting hole 21 Thinning recess 22 Female thread hole 23 Mounting bracket 24 Stepped hole 25 Bolt 26 Through hole 27 Engaging groove 28 Screw 29 Cap

Claims (5)

  The lower end of the backrest in a chair comprising a backrest support rod standing up from the rear portion of the leg that supports the seat and a backrest that is supported by fitting a mounting hole that opens downward to the backrest. A protrusion projecting downward from the seat, and a lower surface of the rear end portion of the seat is brought into contact with an upper surface of the protrusion to support the seat on the upper portion of the leg. Chair.   The backrest supporting saddle is a pair of left and right standing upright on both sides of the seat, and the backrest left and right sides of the backrest with a downward projecting portion provided at the lower end are provided on the backrest supporting saddle. A mounting hole that opens below the downward projection is fitted from above, and the lower surfaces of both sides of the rear side of the seat are brought into contact with the upper surface of the projecting piece that projects from the lower end of the left and right downward projections. The chair according to claim 1.   The rear end of the seat is fitted between the opposing surfaces or the outer surfaces of the left and right downward projections, and the lower surfaces of the rear side portions of the seat are brought into contact with the upper surfaces of the projecting pieces of the downward projections. The chair according to claim 2 formed.   The upper parts of a pair of left and right rear leg rods facing the up and down direction of the legs are connected by a connecting rod facing in the left and right direction, and a portion of the left and right rear leg rods protruding upward from the connection rod is a pair of left and right The chair according to claim 2 or 3, wherein the chair is a backrest supporting heel.   The chair according to claim 4, wherein the lower surfaces of the left and right downward projecting portions of the backrest are brought into contact with the upper surfaces of both sides of the connecting rod.

Images