JP2011120934A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair with such a simple structure as attaching armrests by using the structure of a pivotally attached part of a back rod of a backrest to a seat board fitting. <P>SOLUTION: The chair includes a leg, a support base laid at the upper end of the leg, the seat board fitting 7 attached to the support base in such a way that the front end is movable in the front and rear direction, a seat board attached to the seat board fitting 7, back rods 5 pivoted to the support base by a horizontal shaft in the lateral direction, the backrest supported by the back rods 5, and armrest supports 10 disposed on sides of the seat board. A part of the back rod 5 in the rear of the horizontal shaft is pivotally attached to the seat board fitting 7 by a shaft 23 fixed to the rear of the seat board fitting 7, and the armrest supports 10 are attached to the seat board fitting 7. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a chair with an armrest that can move a seat back and forth in conjunction with tilting of a backrest.

  In some conventional swivel chairs, the backrest tilts rearward and the seat tilts and moves back and forth due to the load of a seated person leaning on the backrest. Such a chair has the advantage of improving the sitting comfort of the occupant and eliminating the feeling of fatigue.

In such a chair, in order to attach the armrest to the support base, the armrest support has a structure bent inward so as to reach the support base, or the horizontal axis extending from the support base is provided only for the purpose. It was attached (for example, refer patent documents 1-3).
Therefore, the structure is troublesome.

JP-A-10-234512 Japanese Patent Laid-Open No. 10-117883 Japanese Patent Laid-Open No. 10-127410

  In view of the above-described problems, the present invention provides a chair with a simple structure in which an armrest is also attached using the structure of a pivotal attachment portion between a backrest and a seat plate mounting bracket. It is an object.

According to the present invention, the above problem is solved as follows.
(1) A leg, a support base mounted on the upper end of the leg, a seat plate mounting bracket attached to the support base so that a front end portion thereof is movable back and forth, and a seat attached to the seat plate mounting bracket A plate, a backrest pivotally attached to the support base with a horizontal axis facing in the left-right direction, a backrest supported by the backrest, and an armrest post disposed on a side of the seat plate, With the shaft fixed to the rear portion of the seat plate mounting bracket, the portion of the back that is behind the horizontal axis is pivotally attached to the seat plate mounting bracket, and the armrest strut is mounted to the seat plate mounting bracket.

  With such a configuration, the armrest strut, and thus the armrest, can be attached using the bearing part, which is the attachment part of the seat plate mounting bracket and the backrest, without being separately attached to the support base. It is supported easily and reliably without complicating the structure of the bracket or armrest support.

  (2) In the above paragraph (1), a screw hole is provided at the inner end of the shaft pivotally attached to the back and the bolt inserted into the hole provided in the front and rear partition plate provided at the rear part of the seat plate mounting bracket Is screwed into the screw hole to fix the inner end of the shaft to the seat plate mounting bracket.

  (3) In the above item (1) or (2), by providing a female threaded portion at the outer end of the shaft pivotally attached to the back, and screwing a bolt inserted from the outside of the armrest strut into the female threaded portion The armrest strut is fixed to the seat plate mounting bracket via the shaft.

  ADVANTAGE OF THE INVENTION According to this invention, the chair of a simple structure which attached the armrest also using the structure of the pivotal attachment part of the backrest of a backrest and a seat board mounting bracket can be provided.

It is a side view of the chair which is one embodiment of the present invention. Similarly, it is an exploded perspective view of a chair. Similarly, it is a perspective view of a dorsal fin. Similarly, it is a perspective view of a bearing part. Similarly, it is a perspective view showing an exploded view of a seat plate mounting bracket, a shaft, a receiving frame, a part of a backrest, and a part of an armrest support. Similarly, it is an enlarged sectional view showing a seat plate mounting bracket, a shaft, a receiving frame, a part of a backrest, and a part of an armrest strut in an assembled state.

  FIG. 1 is a side view of a chair according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof. As shown in these drawings, a support base (2) is attached to an upper end of a leg (1) with casters. Is supported by the horizontal axis (3) extending in the left-right direction at the rear part of the support base (2) and supporting the left and right sides of the backrest (4) and from the lower end of the backrest (4). A shaft cylinder (6) facing the left-right direction formed at the tip of a dorsal fin (5) (see FIG. 3) extending forward is pivotally attached.

  The bearing portions (8) provided on the left and right of the rear portion of the seat plate mounting bracket (7) are provided with an ear piece (upwardly protruding) provided at the front portion of the intermediate portion of the backrest (5) of the backrest (4). 9) is rotatably accommodated. Details of this will be described later with reference to other drawings.

  An ear piece (11) protruding downward is provided at the front part of the seat plate mounting bracket (7), and the pin (14) inserted through the hole of the ear piece (11) is located in front of the support base (2). It is inserted through a long hole (12) extending in the front-rear direction provided in the upward projecting piece (2a) provided in the section, and the front part of the seat plate mounting bracket (7) can be moved horizontally on the support base (2). I support it.

  A seat plate (18) constituting the lower surface of the seat (17) is mounted on the seat plate mounting bracket (7).

  As shown in FIG. 5, the seat plate mounting bracket (7) is composed of a horizontal bar (13) extending in the left-right direction at the rear part and rails (15) extending in the front-rear direction from the left and right ends of the horizontal bar (13). Has been.

  The horizontal bar (13) is formed by bending the steel sheet so as to form a generally U-shaped cross section, and at both left and right ends thereof, as shown in FIG. The partition plates (19) and (20) facing the front-rear direction are welded. A relatively large-diameter round hole (21) is formed in the partition plate (19), and a relatively small-diameter hole (22) is formed in the partition plate (20) to form a bearing portion (8).

  An opening (16) for inserting the ear piece (9) of the dorsal fin (5) is provided on the lower surface of the bearing portion (8), that is, the U-shaped bottom.

  A shaft (23) is inserted into the bearing portion (8). A screw hole (23a) is formed in the inner end of the shaft (23), and a female screw (23b) is formed in the outer end.

  As shown in FIG. 4, a receiving frame (24), which is a plastic molded product, is disposed outside the bearing portion (8). The receiving frame (24) has a hole (27) penetrating in the left-right direction at the center, and an inner end portion of the receiving frame (24) is a fitting portion having a rectangular cross section that fits outside the U-shaped bearing portion (8). Similarly, the outer end portion is formed on a substantially V-shaped vertical surface (29) in plan view.

  On the outside of the receiving frame (24), a lower end portion of the armrest strut (10) and a bolt (25) for attaching it are shown. A mounting shaft (30) protrudes inwardly from the lower end of the armrest strut (10), and a vertical surface (31) complementary to the vertical surface (29) is formed at the tip thereof.

  As shown in FIG. 5, the ear piece (9) of the dorsal fin (5) is first inserted into the opening (16) from below in the bearing portion (8). Next, from the outside of the bearing portion (8), the shaft (23) is inserted through the round hole (21) of the partition plate (19) and through the hole of the ear piece (9), and the inner end is divided into the internal partition. The bolt (32) is brought into contact with the plate (20) and screwed into the inner screw hole (23a) of the shaft (23) through the hole (22).

  In this state, as shown in FIG. 6, the outer end portion of the shaft (23) protrudes considerably outside the bearing portion (8). Here, the receiving frame (24) is inserted and fitted to the outside of the bearing portion (8). The vertical surface (31) is brought into contact with the V-shaped vertical surface (29) of the outer end portion of the receiving frame (24), the armrest strut (10) is positioned, and the bolt (25) is externally attached to the armrest strut. The armrest strut (10) is attached by inserting it into the female threaded portion (23b) of the shaft (23) fitted into the hole (27) of the receiving frame (24).

  With such a configuration, the seat plate (18), and thus the seat (17), can be moved back and forth while the rear part sinks slightly in conjunction with the tilting of the backrest (4).

(1) Leg
(2) Support base
(2a) Upward projecting piece
(3) Horizontal axis
(4) Backrest
(5) dorsal fin
(6) Shaft cylinder
(7) Seat plate mounting bracket
(8) Bearing part
(9) Ear pieces
(10) Armrest prop
(11) Ear piece
(12) Long hole
(13) Yokohama
(14) Pin
(15) Rail part
(16) Opening
(17) Seat
(18) Seat plate
(19) (20) Partition plate
(21) Round hole
(22) Hole
(23) Axis
(23a) Screw hole
(23b) Female thread
(24) Receiving frame
(25) Bolt
(26) Armrest
(27) Hole
(28) Mating part
(29) Vertical plane
(30) Mounting shaft
(31) Vertical plane
(32) Bolt

Claims (3)

Legs,
A base mounted on the upper end of the leg;
A seat plate mounting bracket attached to the support base so that the front end is movable back and forth,
A seat plate attached to the seat plate mounting bracket;
A dorsal fin pivotally attached to the support base with a horizontal axis facing in the left-right direction;
A backrest supported by the dorsal fin;
An armrest strut disposed on a side of the seat plate, and a shaft fixed to a rear portion of the seat plate mounting bracket is pivotally attached to the seat plate mounting bracket at a portion rearward from the horizontal axis. In addition, a chair characterized in that the armrest post is attached to the seat plate mounting bracket.   A screw hole is provided at the inner end of the shaft pivotally attached to the back, and a bolt inserted into a hole provided in a partition plate facing in the front-rear direction provided at the rear part of the seat plate mounting bracket is screwed into the screw hole. The chair according to claim 1, wherein an inner end portion of the shaft is fixed to a seat plate mounting bracket.   A female threaded portion is provided at the outer end of the shaft pivotally attached to the back, and a bolt inserted from the outside of the armrest strut is screwed into the female threaded portion so that the armrest strut is attached to the seat plate via the shaft. The chair according to claim 1 or 2, which is fixed to a metal fitting.

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