JP4704553B2 - Chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
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.
[0002]
[Prior art]
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.
[0003]
[Problems to be solved by the invention]
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. Therefore, the structure is troublesome.
[0004]
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.
[0005]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) Supporting the backrest, the front ends of the left and right backrests extending downward and forward are pivotally attached to the rear portion of the support base by a horizontal axis extending in the left-right direction, and a seat plate is attached to the front portion of the support base. The front part of the mounting bracket is movably mounted in the front-rear direction, and the portion behind the horizontal axis in the dorsal fin and the rear part of the seat plate mounting bracket are pivotally attached by a left-right axis, In a chair that can move the seat back and forth in conjunction with the tilting of the backrest, an inner end is fixed to the rear part of the seat plate mounting bracket, and the outer end of the shaft that pivotally attaches the backrest A female screw part is provided, and a receiving frame and an armrest column are arranged outside the portion where the shaft is provided in the seat plate mounting bracket, and the female screw part is inserted from the outside of the armrest column to the receiving frame. The armrest post is attached to the seat plate mounting bracket with a bolt screwed to the base plate. Put so.
[0006]
(2) In the above item (1), an ear piece provided with a hole in the left-right direction is projected on the upper part of the front part of the middle part of the backpack, and the ear piece is inserted into the rear part of the seat plate mounting bracket. And while inserting the axis | shaft of the left-right direction in the hole of the said ear piece, this axis | shaft is hold | maintained to a seat plate mounting bracket.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
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.
[0008]
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.
[0009]
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.
[0010]
A seat plate (18) constituting the lower surface of the seat (17) is mounted on the seat plate mounting bracket (7).
[0011]
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.
[0012]
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) 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).
[0013]
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.
[0014]
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.
[0015]
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.
[0016]
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.
[0017]
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).
[0018]
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).
[0019]
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).
[0020]
【The invention's effect】
According to the first aspect of the present invention, the armrest strut, and hence the armrest, are attached by using the bearing portion that is the attachment portion of the seat plate mounting bracket and the backrest without being separately attached to the support base. Therefore, it is supported easily and reliably without complicating the structure of the seat plate mounting bracket or the armrest support.
[0021]
According to invention of Claim 2, attachment of a seat board mounting bracket and a backrest can be made reliable.
[Brief description of the drawings]
FIG. 1 is a side view of a chair according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the chair.
FIG. 3 is a perspective view of the dorsal fin.
FIG. 4 is a perspective view of a bearing portion.
FIG. 5 is an exploded perspective view of a seat plate mounting bracket, a shaft, a receiving frame, a portion of a backrest, and a portion of an armrest post.
FIG. 6 is an enlarged cross-sectional view showing a seat plate mounting bracket, a shaft, a receiving frame, a part of a backrest, and a part of an armrest post in the assembled state.
[Explanation of symbols]
(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 (2)

The front ends of the left and right dorsal fins that support the backrest and extend forward and downward are pivotally attached to the rear part of the support base by a horizontal axis that extends in the left-right direction. A front part is attached so as to be movable in the front-rear direction, and a portion of the dorsal fin rearward from the horizontal axis and a rear part of the seat plate mounting bracket are pivotally attached by a left-right axis, and the backrest In a chair that can move the seat back and forth in conjunction with tilting,
An inner end is fixed to a rear portion of the seat plate mounting bracket, and an internal thread portion is provided at an outer end portion of the shaft that pivotally attaches the backrest, and a portion of the seat plate mounting bracket in which the shaft is provided. A receiving frame and an armrest strut are arranged on the outside, and the armrest strut is attached to the seat plate mounting bracket with a bolt inserted into the receiving frame from the outside of the armrest strut and screwed into the female screw portion. A chair characterized by that.   An ear piece provided with a left and right hole is projected on the upper part of the front part of the middle part of the dorsal fin, the ear piece is inserted into the rear part of the seat plate mounting bracket, and the ear piece is inserted into the left and right direction. The chair according to claim 1, wherein the shaft is inserted and the shaft is held by a seat plate mounting bracket.

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