JPS6343608A - Chair - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a chair, and particularly to a chair whose seat body can elastically swing back and forth with respect to its legs when the chair is seated.

BACKGROUND TECHNOLOGY AND PROBLEMS Conventionally, in this type of chair, an inner tubular shaft is horizontally fixed through a bracket provided at the upper end of the support column of the leg body, and the inner tubular shaft is placed at the left and right positions. Two outer tubular shafts to be fitted into each other are provided protruding from the left and right side surfaces of the frame surrounded by the bracket at a required interval, and the two outer tubular shafts are respectively fixed to the seat body, and the inner By inserting a torsion spring into the tubular shaft and fixing one end to the inner tubular shaft and the other end to the seat body side, the seat body is biased in the upright direction and moves back and forth with respect to the body body when seated. The swing range of this seat body is restricted by adjusting the gap in the front and rear direction between the bracket to which the inner tubular shaft is fixed and the frame body to which both outer tubular shafts are fixed. This was done by using them and touching them.

However, according to the chair configured in this way, the outer tubular shaft is divided into two parts and protrudes from the left and right sides of the frame.
Errors tend to occur between the shaft center and the shaft center of the inner tubular shaft, which consists of a single shaft, and as a result, when the seat body swings, a scraping sound is generated between the inner and outer tubular shafts, causing discomfort to the seated person. There was a risk of giving.

In addition, since the swing range of the seat body is regulated at a position relatively far away from the axis of the inner and outer tubular shafts, the area before the bracket collides with the frame body at the maximum swing of the seat body becomes large. Therefore, in the past, it was necessary to provide a cushioning material such as rubber between the bracket and the frame, which resulted in a complicated structure and poor durability.

OBJECTS, EMBODIMENTS, AND OPERATIONS OF THE INVENTION In view of these points, the present application provides a chair in which the seat body can smoothly oscillate and the range of oscillation that is difficult to occur before collision can be controlled using a simple mechanism. An embodiment of the present application will be described below with reference to the drawings.

In the figure, (1) is a seat body, in which a backrest (1)b is integrally provided on a seat part (1)a, and from the side of this seat (1)a to the bottom of the backrest (1)b, both sides Armrests (1)c and (1)c are provided in the section.

(2) is a leg that supports the seat (1), and stands upright (
As shown in FIG.
) is fixed via a bearing cylinder (6), and the tip of this support member (4) is formed wide, and the center part of the inner tubular shaft (7) is formed on the end surface. Outer tubular shaft (
It is horizontally fixed horizontally through a window hole (9), which will be described later, provided in 8).

In the center of the outer tubular shaft (8), there is an opening whose circumferential width is larger than the thickness of the support member (4) and whose axial width is smaller than the tip width of the support member (4). The part (9)a extends in the axial direction from the central part on both axial sides of the opening part (9)a, and has a circumferential width that is a predetermined gap from the thickness of the support member (4). A window hole (9) consisting of a width a for setting the width, that is, a swing angle of the seat body (1), and a swing regulating hole portion (9) b is formed, and the inner tubular shaft (8) The outer tubular shaft (8) is inserted through the window hole (9) and is fixed to the wide end portion of the support member (4) by welding p.

A torsion spring (10) having a square cross section is inserted into the inner tubular shaft (7), and one end of the torsion spring (10) is fixed to one end of the inner tubular shaft (7) via a fixing ring (11). , the other end protrudes from the other ends of both the inner and outer wheels (7), (8) and fixes the arm (12), and the arm (12) is connected to the inner and outer wheels (7), (8).
A washer (13) is interposed between the arm (12) and the end face of the arm (12), and the rear end of the arm (12) is connected to the seat body (
1) Supported on the side.

At the left and right ends of the outer tubular shaft (8), there are brackets (15) on both sides having a cross-sectional shape fixed to the lower surface of the seat (1).
, (15)b are fixed, so that the seat body (1) can freely rotate in the front-rear direction while applying a biasing force to the torsion spring (10) with respect to the elastic body (2). In this example, a vertical screw hole is provided at the rear end of the arm (12), and an L-shaped adjustment handle (14) is provided in the rear end of the arm (12).
) are screwed together, and the tip head (
14)b is brought into contact with the horizontal lower surface of one of the brackets 7) and (15)a, so that the initial biasing force of the torsion spring (10) can be adjusted by rotating the handle (14).

The outer tubular shaft (8) is also equipped with a locking mechanism (16) for locking the inner tubular shaft (7) to the outer tubular shaft (8) in order to disable the locking action.

In the figure, (17) is an arm cover that integrally covers the support member (4), the auxiliary arm (5), and the bearing cylinder body (6), and the front edge (17) a slides into contact with the outer tubular shaft (8). be done.

Next, the operation of the chair configured as described above will be explained.

First, when you sit on the seat part (1) a of the seat body (1) and lean your upper body strongly against the backrest (1) b, the entire seat body (1) is pivoted to the leg body (2), that is, on the inner side. It is tilted rearward about the fitting joint between the tubular shaft (7) and the outer tubular shaft (8) while applying the biasing force of the torsion spring (10);
When the upper body is raised in this backward leaning state, it is rotated in the standing direction by the biasing force of the torsion spring (10). With this action, the seat body (1) swings back and forth, that is, performs a rocking action. This rocking action is performed at the front of the seat body (1) via the support member (4) extending forward from the leg body (2), so the seated person performs the rocking action while keeping his or her feet on the floor. The rocking action is performed in a stable posture without any vertical movement of the various parts.

The locking operation of the seat 1) is performed in the range where the upper and lower edges of the swing regulating hole (9)b formed in the outer tubular shaft (8) abut against the support member <4), and this Since the motion restriction is performed at positions extremely close to the rotation centers of the inner and outer tubular shafts (7) and (8), there are almost no collisions, and there is no risk of causing discomfort to the seated person.

Note that the initial biasing force of the torsion spring (10) can be adjusted by rotating the adjustment handle (14) and varying the protrusion length of the head (14)a. That is, sitting body (1)
The biasing force can be adjusted according to the preference of the seated person.

Also, the locking operation of the seat body (1) is stopped and the seat body (1) is stopped.
) can be fixed with respect to the legs (2) by operating the locking mechanism (16) as described above to lock the outer tubular shaft (8) via the inner tubular shaft (7).

Effects of the Invention As described above, according to the present application, the outer tubular shaft and the inner tubular shaft that pivotally connect the seat body and the leg body in a swingable manner are fitted continuously without being separated. The axes of both axes coincide throughout, so there is no risk of unpleasant scraping noises occurring when the seat swings, and the rotation is extremely smooth, and the swing range of the seat, that is, the rocking angle, is restricted. Since this is performed at a location extremely close to the axis of the inner and outer tubular shafts, there are almost no collisions caused by the swinging of the seat body, and a comfortable rocking motion of the seat body is achieved. It has the advantage of being simple and easy to manufacture.

[Brief Description of the Drawings] Fig. 1 is a perspective view of a chair according to an embodiment of the present application, Fig. 2 is a side view of the main parts of the chair, Fig. 3 is an enlarged sectional view of the pivot portion of the chair, Figure 4 is a sectional view taken along line A-A in Figure 3, Figure 5 is a plan view of the support frame of the same chair, Figure 6 is an enlarged sectional view taken along line B-B'Ia in Figure 5, and Figure 7 is FIG. 5 is an enlarged sectional view taken along the line CC. In the figure, (1) is the seat body, (2) is the leg body, (3) is the support column, (
4) is a support member, (7) is an inner tubular shaft, (8) is an outer tubular shaft, (9) is a window hole, (9) a is an opening, (9) b is a swing regulating hole, (10) is a torsion spring, (12) is an arm, and (14) is an adjustment handle. Figure 1

Claims (4)

[Claims] (1) In a chair in which the seat body can swing back and forth with respect to the legs, the outer tubular shaft that is horizontally fixed to the seat body is rotated around the inner tubular shaft that is horizontally fixed to the legs. a support member that is movably inserted and inserted, and that extends from the leg body through a window hole having a swing regulating hole portion that is larger than the thickness of the tip end of the support member, which will be described later, approximately in the center of the outer tubular shaft; The tip of the torsion spring is fixed to the inner tubular shaft, and a torsion spring is inserted into the inner tubular shaft, one end of which is fixed to one end of the inner tubular shaft, and the other end is supported on the seat body side. A chair featuring. (2) The support member has a base attached to and supported by the upper end of the leg support via a bearing cylinder, extends forward and upward, and has its distal end fixed to the inner tubular shaft. The chair mentioned in the section. (3) the window hole is smaller than the width of the tip of the support member;
The chair according to claim 1 or 2, further comprising: an opening portion whose width in the circumferential direction is larger than its thickness; and swing regulating holes extending in both directions of the opening portion. (4) A rearwardly extending arm is fixed to the other end of the torsion spring, and the rear end is fixed to a bracket for attaching the seat.Claim 1, 2 or 3 The chair mentioned.