JP5670701B2 - Chair armrest mounting structure - Google Patents

Description

  The present invention relates to an armrest mounting structure for a chair in which an armrest is mounted so as to be positioned on the outer side of a backrest.

  As a conventional armrest mounting structure of a chair, for example, as described in Patent Document 1, a groove on the backrest that is supported by a backrest support erection that stands up from the rear part of the leg is formed on the side of the backrest. Provided, and the downward mounting portion of the rear end of the armrest is fitted into the concave groove, and the downward mounting portion is fixed to the inner surface of the concave groove with a screw, as described in, for example, Patent Document 2 Fit the armrest rod at the rear end of the armrest into the upper end of the rear leg that forms part of the leg and faces up and down, and insert it into the female screw member on the armrest from the side of the rear leg There is a type in which an armrest rod is pressed against the inner surface of the rear leg and fixed by screwing the bolt.

Japanese Patent No. 4295267 (FIG. 5 etc.) Japanese Patent No. 4441096

In the armrest mounting structure described in Patent Document 1, a downward mounting portion of the armrest is fitted in a recessed groove facing the up-down direction of the side surface of the backrest, and the fixed area of each other is relatively Since it is large, there is an advantage that even if it is fixed only with a screw, the possibility that the armrest wobbles in the front-back direction can be reduced.
However, since it is an essential requirement to provide a concave groove on the side surface of the backrest, there is no armrest and it cannot be shared with a backrest that does not require a concave groove.
Moreover, since it is fixed only with a screw, when the screw is loosened, there is a possibility that the armrest may wobble in the left-right direction.

  In the armrest mounting structure described in Patent Document 2, since the armrest rod and the rear leg to which it is fitted are both made of a round pipe material, when the armrest rod is fitted to the rear leg, It may turn, and a fitting position may shift up and down. In this case, since the female screw member provided on the armrest and the bolt insertion hole provided on the rear leg are not aligned, it takes time and effort to fix the rear leg and the armrest with the bolt. Become.

  The present invention has been made in view of the above problems, and it is not necessary to make the side surface of the backrest specially shaped for attaching an armrest, or to perform processing or the like, regardless of the presence or absence of the armrest. An object of the present invention is to provide an armrest mounting structure for a chair that can be used in common and can be easily positioned and can be stably mounted.

According to the present invention, the above-mentioned problems are solved as follows.
(1) The backrest is supported by a backrest support rod that stands up from the rear portion of the leg body, and the lower end portion of the mounting base that faces the vertical direction on the armrest is disposed at the rear end of the leg body on the side of the backrest. The armrest is attached to the upward projection of the armrest support member and the upper end of the mounting base is fastened with a bolt to the side of the backrest, so that the inner surface of the mounting base is It is attached to the leg and the backrest so as to contact the side surface of the backrest.

With such a configuration, the armrest is supported by being fitted to and supported by an armrest support member that is erected at the rear end of the leg, and the upper end of the attachment base is on the side of the backrest. Since it is attached by screwing, it is not necessary to make the side of the backrest specially shaped for attaching an armrest or special processing, etc. Can be shared.
Also, since the lower end of the armrest mounting base is fitted and supported by an armrest support member erected on the leg, the armrest can be easily positioned and stably attached to the side of the backrest. .
Furthermore, since the downward load applied to the armrest is received by the leg through the armrest support member, a large load is not directly applied to the backrest or the screw.

(2) In the above item (1), the backrest is supported by fitting the backrest by fitting a mounting hole that opens downward in the backrest supporting collar, and the bolt inserted from the outside into the mounting base of the armrest. The armrest is inserted into the left and right female screw holes provided in the upper part of the backrest support ridge through the side end portion of the backrest, and the armrest is attached by the mounting base and the backrest support ridge. Attach so that the side edge of the backrest is pinched.

  With such a configuration, it is possible to increase the tightening force of the screw as compared with the side of the backrest that is generally formed of a synthetic resin and the armrest mounting base that is directly screwed. Since the side edge of the back is strongly held between the back support heel and the mounting base of the armrest, the mounting strength of the armrest to the backrest is increased, and this can be attached to the side of the backrest more stably. it can.

(3) In the above item (1) or (2), the upward projection of the armrest support member and the mounting hole provided in the lower end of the mounting base of the armrest fitted thereto are of a non-circular cross section. To do.

  With such a configuration, the lower end of the mounting base of the armrest does not rotate with respect to the armrest mounting member, so even if the upper end of the mounting base is fixed with one screw, the lower end of the mounting base There is no fear of wobbling and the backrest is stable.

(4) In any one of the above items (1) to (3), the upper portions of a pair of left and right rear leg rods facing in the vertical direction in the leg are connected by connecting rods facing in the left-right direction, A portion protruding upward from the connecting rod in the leg rod is referred to as a backrest supporting rod.

  With such a configuration, the upper part of the pair of left and right rear leg rods in the leg is connected by the connecting rod, so that the rigidity of the rear portion of the leg is increased and the upper portion of the rear leg rod is used as a backrest supporting rod. Therefore, the support strength of the backrest can be increased, and the armrest can be attached to the side surface of the backrest more stably.

(5) In the above item (4), the upper portions of the left and right rear leg rods are inserted into and fixed to the vertical through holes provided on both sides of the connecting rod.

  With such a configuration, the left and right rear leg rods can be easily positioned in the left-right direction and can be firmly connected to each other.

(6) In the above item (5), the connecting rod is made of a pipe, and an armrest support member is fitted to the side end portion thereof.

With such a configuration, the armrest support member can be easily attached to the side end portion of the connecting rod forming a part of the leg body without performing special processing on the leg body.

According to the present invention, the armrest is supported by the lower end of the mounting base being fitted to and supported by an armrest support member standing on the rear end of the leg, and the upper end of the mounting base is screwed to the side of the backrest. Since it is fixed and attached, the side surface of the backrest does not need to have a special shape for attaching an armrest or special processing or the like, and can be shared with a backrest without an armrest.
Also, since the lower end of the armrest mounting base is fitted and supported by an armrest support member erected on the leg, the armrest can be easily positioned and stably attached to the side of the backrest. .

It is a front view of a chair provided with one 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.

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

  At this time, the armrest 4 is positioned in the vertical direction by fitting its mounting base portion 4a to the protruding shaft 11a of the armrest support bracket 11, so that the female screw hole 22, the stepped hole 24, and the through hole 26 are connected. In a state where they are aligned with each other, the bolt 25 can be easily screwed into the female screw hole 22, and the mounting work of the armrest 4 becomes efficient.

  Further, the lower end portion of the mounting base 4a is fitted and supported by the non-circular upward projection 11a, and the fitting hole 20 having a square cross section is fitted to the upward projection 11a, so that the armrest 4 Since the lower end portion is prevented from rotating, even if only the upper end portion of the mounting base portion 4a is fixed with one bolt 25, the lower end portion of the mounting base portion 4a is not wobbled. It can be stably attached to the frame 15a. In addition, since the bolt 25 is screwed into the female screw hole 22 of the mounting bracket 23 attached to the back support rod 9, the bolt 25 can be compared with the case where it is bolted directly to the synthetic resin side frame 15a. 25 and the side frame 15a can be strongly clamped by the backrest support collar 9 and the mounting base 4a of the armrest 4, so that the armrest 4 to the backrest 3 can be secured. Mounting strength can be increased.

  Furthermore, since the side frame 15a of the backrest 3 does not need to have a special shape for attaching the armrest 4 or special processing or the like, it can be shared with the backrest without the armrest 4. When the armrest 4 is not attached to the backrest 3, the through hole 26 provided in the side frame 15a need only be blocked by a cap or the like.

  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 are fitted and locked from the front, and the entire seat 2 is secured, and the left and right cutout portions 14 are the lower ends of the back frame 15. It is placed on the upper surface of the seat support rod 8 that forms the frame shape of the upper portion of the leg 1 so as to be positioned between the downward projecting portions 17 and 17 of the leg portion. 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).

In this state, 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 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 portion of the leg 1, as shown in FIG. 6, the seat frame 12 is placed on the upper surfaces of the projecting pieces 19, 19 projecting from the lower facing surfaces of the left and right downward projecting portions 17 of the back frame 15. 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.

The present invention is not limited to the above embodiment.
In the above embodiment, the backrest 3 and the armrest 4 are fastened together with the mounting bracket 23 at the upper end portion of the backrest support rod 9 by one bolt 25, but the upper end portion of the mounting base portion 4a is fixed. Instead of using the backrest support rod 9, it may be fixed directly to the side surface of the side frame 15 a with the bolt 25. At this time, the back support rod 9 is slightly shorter or the mounting base 4a is slightly longer, and a female screw hole is provided on the side surface of the side frame 15a above the back support rod 9. That's fine.
In this case, the backrest support rod 9 and the backrest 3 are not fixed by the bolts 25. However, as described above, the protrusion protruding from the lower ends of the left and right downward protrusions 17 of the backrest 3 is provided. Since the piece 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.

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 (armrest support member)
11a upward projection 12 seat frame 13 flexible seat plate 14 notch 14a rearward projection 15 back frame 15a side frame 16 flexible back plate 17 downward projection 18 mounting hole 19 projecting piece 20 mounting hole 21 Lightening recess 22 Female thread hole 23 Mounting bracket 24 Stepped hole 25 Bolt 26 Through hole 27 Engaging groove 28 Screw

Claims (6)

  The backrest is supported by a backrest support rod that stands up from the rear portion of the leg, and the lower end of the mounting base that faces the vertical direction of the armrest is provided at the rear end of the leg at the side of the backrest. The armrest is fitted into the upward projection of the armrest support member, and the upper end of the mounting base is fastened with a bolt to the side of the backrest so that the inner surface of the mounting base is backrested. An armrest mounting structure for a chair, wherein the armrest mounting structure is attached to the leg and the backrest so as to contact a side surface.   The backrest is supported by fitting the backrest to the backrest by fitting a mounting hole that opens downward, and the bolt inserted from the outside into the mounting base of the armrest penetrates the side end of the backrest. Then, by screwing into a female screw hole facing the left and right direction provided at the upper part of the backrest support collar, the armrest is sandwiched between the mounting base portion and the backrest support collar between the side ends of the backrest. The armrest mounting structure for a chair according to claim 1, wherein the armrest mounting structure is mounted.   The armrest mounting structure for a chair according to claim 1 or 2, wherein the upward projecting portion of the armrest support member and the mounting hole provided at the lower end portion of the armrest mounting base fitted to the armrest support member have a non-circular cross section.   The upper parts of a pair of left and right rear leg rods facing the vertical direction on the legs are connected by connecting rods facing the left and right direction, and the portions protruding above the coupling rods on the left and right rear leg rods are supported on the back The armrest mounting structure in the chair according to any one of claims 1 to 3, wherein the armrest mounting structure is formed as a bag.   The armrest mounting structure for a chair according to claim 4, wherein upper portions of the left and right rear leg rods are fixedly inserted through vertical through holes provided on both sides of the connecting rod. 6. The armrest mounting structure for a chair according to claim 5, wherein the connecting rod is made of a pipe, and an armrest support member is fitted to a side end portion thereof.

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