JPH0418422Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Use The present invention relates to chairs, particularly chairs that are arranged in large numbers in theaters and the like, and whose seats can be raised and lowered freely.

Conventional technology and its problems A large number of chairs of this kind are arranged in rows as audience seats in theaters, etc., and when not in use, the seat body stands up with the palms of the hands touching the backrest body, which obstructs walking between the rows of chairs. The measures are taken to ensure that this does not happen. The rising motion of the seat body is automatically performed by the elastic biasing force of the spring when the seated person stands up, and for this reason, the seat body is brought into close contact with the backrest body when the seated person stands up. However, if the seat is placed too close to the seat back, small items placed on the seat, such as cigarette butts, may get caught and become invisible from the outside, resulting in loss of the seat or ignition of a fire. In addition, the repulsive force of the springs may cause the seat body to collide with the backrest body, resulting in a stoppage noise, deterioration of the springs, and the possibility of the seat body collapsing smoothly when seated. It has the defect that it is not.

Purpose, Examples, and Effects of the Invention In view of these points, the present invention provides a chair configured so that the seat body can be reliably held at a predetermined upright inclination angle with respect to the backrest body using a simple mechanism. With the goal.

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a seat body, which is pivoted between left and right legs 2a and 2b erected on the floor via a support shaft 3 so as to be able to rise and fall from a vertical state to a horizontal state. At the rear part between the bodies 2a and 2b, a backrest body 4 is located behind the seat body 1 and is fixedly erected in a slightly backward tilted state, and armrests 5a, 5b is installed.

A torsion coil spring 6 is wound around a support shaft 3 that pivotally supports the seat body 1 relative to the legs 2a and 2b, one end 6a of which is locked onto the support shaft 3, and the other end 6b.
extends forward perpendicularly to the support shaft 3.
This torsion coil spring 6 is fitted into an insertion hole 7 of a support shaft 3 provided in the seat body 1, and the other end portion 6b of the torsion coil spring 6 is connected to the front and rear holes formed on the side surface of the seat body 1. It is interposed in a recess 1a having a long shape in the direction.

The side recess 1a of the seat body 1 is closed by a cover plate 8, and a shaft hole 8a is bored near the rear of the cover plate 8 in correspondence with the support shaft 3. An arcuate hole 8b with the shaft hole 8a as its centripetal point is provided so as to correspond to the tip of the other end 6b of the torsion coil spring 6, and the cover plate 8 is
With the recess 1a closed, the support shaft 3 is rotatably supported in the shaft hole 8a by a bush 9, and the cover plate 8 is inserted into screw holes 10, 10 provided at front and back positions on the side surface of the seat body 1. It is fixed by tightening the setscrews 11, 11, respectively. Reference numeral 12 denotes an arm plate disposed in an overlapping manner on the outer surface side of the lid plate 8. The support shaft 3 is inserted into a shaft hole 12a provided in this arm plate. An engagement pin 13 is protruded to be inserted into the side recess 1a of the seat body 1 through an arcuate shape 8b provided on the plate 8. A locking piece 14 is vertically protruded from the outer surface of the rear part, and a buffer body 15a, 15b are fixed respectively.

Although not shown, on the other side of the seat body 1, a rectangular recess, a lid plate, and an arm plate similar to those described above are arranged symmetrically.

A seat body 1 is provided on the inner surface of the legs 2a and 2b, respectively.
In the collapsed state and the extreme upright state, the support bodies 16 and 17, which the locking piece 14 of the arm plate 12 abuts through the buffer bodies 15a and 15b, respectively, are fixed in a vertical relationship.

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

First, in the seated state in which the seat body 1 is laid down (the state indicated by the imaginary line in FIG.
The upper end edge 8b contacts the engagement pin 13 of the arm plate 12, causing the arm plate 12 to fall down and rotate, thereby causing the rear locking piece 14 to engage with one of the shock absorbers 15a.
The seat body 1 contacts the upper support body 16 via the support body 16, and thus the seat body 1 is fixedly held in a reclined state. In this example, the reclined state of the seat body 1 is set at an angle of approximately 10 degrees.
In this state, the other end 6b of the torsion coil spring 6 is pressed downward by the engagement pin 13 to store repulsive force.

Next, in this state, when the seated person leaves the seat 1, the repulsive force of the torsion coil spring 6 is applied to the cover plate 8 via the engagement pin 13, so that the seat 1 is centered around the support shaft 3. At this time, the arm plate 12 is also raised and rotated together, and the locking piece 14 is brought into contact with the lower support body 17 via the other buffer body 15b, whereby the seat is lifted up and rotated. The body 1 stands up with its palms clasped against the backrest body 4.

That is, in this example, the angle is approximately 88 degrees, as shown by the virtual line B in FIG.

By the way, in the present invention, when the elasticity of the torsion coil spring 6 is balanced with the weight of the seat body 1, as shown by the solid line in FIG. body 4
It is set so that a steady state is reached at a required opening angle (approximately 20 degrees). Therefore, in a steady standing state, the engagement pin 13 is attached to the upper edge 8 of the arcuate hole 8b.
It comes into contact with b′.

When the seat body 1 is further pressed in the direction of the backrest body 4 from this state, the seat body 1
Within the range of , it tilts so that its palms join together with the backrest body 4, resulting in the state shown in the imaginary line B in Fig. 2, and from this state,
When the pressure on the seat body 1 is released, the seat body 1 returns to the normal standing state with the required opening angle shown by the solid line in the figure.

Effects of the invention Since the present invention is constructed as described above, there is no risk of pinching small objects or cigarette butts on the seat when the seat is not seated, and the seat is placed in a slightly forward-leaning state, allowing the seat to fall down. It is easy to operate, and even if the user stands up and immediately tries to sit down, it is easier to apply force in the direction of lodging the seat, which is advantageous in terms of safety. , the backrest always has a constant opening angle to the body, so when a large number of these chairs are arranged as audience seats in a theater etc., the entire chair has a constant inclination and is aligned neatly when not seated, giving it an extremely good appearance. It has the advantage that there is no risk of spoiling the atmosphere of the installation location.

[Brief explanation of the drawing]

FIG. 1 is a partially exploded perspective view of a chair according to an embodiment of the present invention, and FIG. 2 is a side view showing the operating state of the seat body of the chair. In the figure, 1 is a seat body, 2a and 2b are leg bodies, 3 is a support shaft, 4 is a backrest body, 6 is a torsion coil spring, 6b is another end, 8 is a cover plate, 8b is an arcuate hole, 12 is a In the arm plate, 13 is an engagement pin, 14 is a locking piece, and 16 and 17 are supports.

Claims (1)

[Claims for Utility Model Registration] (1) The seat body is pivotally supported on the legs so that it can rise and fall freely, fixing the backrest body in an upright position, and constantly applying a rotational biasing force in the upright direction to the seat body. In the chair equipped with a spring, a cover plate having a hole that defines a movement range of an engaging pin, which will be described later, is fixed to the side surface of the seat body, and a support shaft that supports the seat body so as to be able to rise and fall freely. , an engaging pin is provided at the front end of the rotatably supported arm plate, and this is engaged in the hole, and the other end of the spring is connected to the engaging pin in the upright direction on the seat body. The spring is locked so that a rotational biasing force is applied, and when the elasticity of the spring and the weight of the seat body are balanced, the elasticity of the spring is adjusted so that the seat body stands up at the required opening angle with respect to the backrest body. A chair featuring a set. (2) The chair according to claim 1 of the utility model registration, which is constructed so that the elasticity of the spring and the weight of the seat are balanced when the seat stands up at about 68 degrees. (3) A coil-shaped spring is wound around a support shaft that supports the seat body with respect to the legs so that it can rise and fall freely, and one end of the spring is latched onto the support shaft, and the other end is tilted forward. The chair according to claim 1 or 2, wherein the extension end is locked to an engaging pin. (4) Scope of Utility Model Registration Claims Paragraph 1, Paragraph 2, or Paragraph 3, where the hole is an arc-shaped hole whose centripetal point is a support shaft on which the seat body is pivotably supported with respect to the leg body in an up-and-down manner. The chair mentioned.