JPH06245839A - Chair - Google Patents

Abstract

PURPOSE:To make a chair with a low cost as any part of its seat doesn't touch the back of the user's thighs or the buttocks when the stands up, and it doesn't make a loud hitting sound when the seat hits the seat back, concerning a chair of such a type as its seat rises rotating around the axis by the power of the energized parts when a user sitting on the seat stands up. CONSTITUTION:When a user sitting on the seat 31 laid down stands up, the seat 31 rises up rotating around the axis by the energized coil spring. In a chair of the type, the damper 71 is to be installed to control the power of rotating the seat 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in, for example, theaters, movie theaters, halls, etc., and when a seat is laid down and erected from a seated state, the seat is supported by the urging force of the urging member. The present invention relates to a chair that rotates around the center and stands up.

[0002]

2. Description of the Related Art FIGS. 3 and 4 are explanatory views showing a structure and an operating state of a main part of a conventional chair described above. FIG. 3 shows a state in which a seat portion is upright, and FIG. It shows the state of being overturned. In FIGS. 3 and 4, reference numeral 1 denotes a backrest, a lower portion of which is fixed to a floor or the like, and a support shaft 11 which rotatably supports a seat portion 31 described later is planted in a slightly lower portion in the middle.
A circular arc hole 2 centering on the support shaft 11 is provided.
The support shaft 11 is planted on the back surface side in FIGS. 3 and 4 in a direction orthogonal to the paper surface.

Reference numeral 21 denotes a locking pin that is planted in the lower part of the backrest 1, and is planted on the front side of FIGS. 3 and 4 in a direction orthogonal to the plane of the drawing. Reference numeral 31 indicates a seat portion rotatably supported by the support shaft 11, 41 indicates a stopper pin planted on a side surface of the seat portion 31 facing the backrest 1, and the stopper pin 41 is an arc hole of the backrest 1. It is inserted through 2 and slightly protrudes from the backrest 1. Reference numeral 51 denotes a coil spring as an urging member, which is stretched between the locking pin 21 and the stopper pin 41 and urges the seat portion 31 in the upright direction. Although not shown, a cover that covers the arc hole 2, the locking pin 21, the stopper pin 41, and the coil spring 51 is attached to the side surface of the backrest 1.

Next, the operation will be described. First, when not seated, the seat portion 31 rotates counterclockwise about the support shaft 11 by the urging force of the coil spring 51 stretched between the locking pin 21 and the stopper pin 41, and the stopper pin 41 is rotated.
Collides with the portion A of the backrest 1 (the lower end portion of the arc hole 2), so that the seat portion 31 maintains the standing state shown in FIG. When the seat portion 31 is rotated clockwise about the support shaft 11 against the urging force of the coil spring 51 for seating, the stopper pin 41 rotates while extending the coil spring 51, and the backrest 1 Since it abuts against the portion B (the upper end portion of the arc hole 2), the seat portion 31 is in the lying state shown in FIG.

Therefore, by placing the buttocks on the seat 31 in the laid-down state shown in FIG. 4, it is possible to maintain the seat 31 in the laid-down state by the weight of the person sitting on the seat 31. Then, when the buttocks are separated from the seat 31 in order to stand up, the seat 31 is rotated counterclockwise about the support shaft 11 by the urging force of the coil spring 51, and the stopper pin 41 is placed on the backrest 1.
Since the seat portion 31 abuts against the portion A, the seat portion 31 is in the standing state shown in FIG. 3, and the standing state is maintained by the biasing force of the coil spring 51.

[0006]

In the conventional chair, when the buttocks are separated from the seat 31 to stand up, the seat 31 rotates counterclockwise about the support shaft 11 by the urging force of the coil spring 51. Since the stopper pin 41 abuts against the portion A of the backrest 1, the seat portion 3 is automatically set without raising the seat portion 31 by hand.
1 is configured to stand up.

Therefore, when the buttocks are separated from the seat 31 to stand up, the seat 31 starts to rotate at the same time. Therefore, when standing up, a part of the seat 31 hits the back side of the thigh or the buttocks. Since the biasing force of the coil spring 51 is strong, the back side of the thigh or the buttocks is hit, which gives the user discomfort. Further, even if a part of the seat portion 31 does not hit the back side of the user's thigh or the buttocks, the seat portion 31 abuts against the backrest 1 by the urging force of the coil spring 51, so that a large abutment sound is generated. , There were some inconveniences, such as being surprised by this hit sound.

The present invention has been made in order to eliminate the above-described inconvenience, and a part of the seat portion does not hit the back side or the buttocks of the user's thighs, and the seat portion collides with the backrest. However, the chair does not generate a loud hitting sound, is easy to use, and is inexpensive and can achieve the intended purpose.

[0009]

According to the present invention, there is provided a chair in which, when the seat portion is laid down and is erected from a seated state, the seat portion is rotated around a support shaft by the urging force of the urging member to erect. ,
A damper is provided for braking the turning force for rotating the seat portion. Further, the damper is assumed to brake only the turning force that erects the seat portion.

[0010]

In the chair according to the present invention, when the seat portion is rotated, the turning force for rotating the seat portion is braked by the damper. Then, by using a damper that brakes only the rotational force that rotates the seat portion in the upright direction, the rotational force that causes the seat portion to lie down is not braked.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the structure of a chair according to an embodiment of the present invention. The same or corresponding parts as those in FIGS. 3 and 4 are designated by the same reference numerals and the description thereof will be omitted. In FIG.
Reference numeral 61 denotes a cover attached to the side surface of the backrest 1, which covers the arc hole 2, the locking pin 21, the stopper pin 41 and the coil spring 51. Reference numeral 71 denotes a damper, which is the seat 3
The rotating force for rotating the shaft 1 around the support shaft 11 is braked. The arc hole 2, the support shaft 11, the locking pin 21,
Since the stopper pin 41 and the coil spring 51 are covered with the cover 61, the reference numerals are omitted.

FIG. 2 is an exploded perspective view showing an example of the structure of the damper shown in FIG. In FIG. 2, reference numeral 71 denotes a rotary piston type damper, which is a rice ball-shaped rotor 7.
2, a rotor housing 73 having a working chamber 73a in which the rotor 72 revolves while rotating on its own, and a rotor 7
No. 2 main shaft 74, an O-ring 75 fitted to the stepped portion 74ba of the main shaft 74, and a working chamber 73 of the rotor housing 73.
It is composed of a lid body 76 for closing the open portion of a and a screw 77 for fixing the lid body 76 to the rotor housing 73.

The rotor 72 is a short, substantially triangular body whose three outer peripheral surfaces depict the inner envelope of an epitrochoid, and is provided with a circular hole 72a at the center of its side surface. The bottom of the hole 72a has internal teeth. Is formed by penetrating the trochoidal phase gear 72b. Further, each apex where the outer peripheral surfaces are joined to each other at an acute angle is a sealing portion 72c, and a through hole 72d that communicates the adjacent outer peripheral surfaces with each other and a through hole 72e that communicates the axial side surfaces through the through hole 72d. Is provided.

In the rotor housing 73 described above, a working chamber 73a whose inner contour has a two-node epitocolloid curve and which is open to the upper surface is formed at the center of one side surface (upper surface), and the trochoidal phase gear is provided at the bottom of the working chamber 73a. A fixed external gear 73b that meshes with 72b is formed. And collar part 7
3c includes a fastening hole 73ca and a fixing notch 73c.
b are formed.

The above-mentioned main shaft 74 has an operating shaft portion 74a having an oval recess 74aa formed at the upper end, a flange 74b having a step portion 74ba integrally formed below the operating shaft portion 74a, and this flange. And an eccentric ring 74c integrally formed below 74b. The flange 74b is formed in a shape and size that closes the opening of the working chamber 73a. The lid 76 described above
A hole 76a through which the operating shaft 74a projects and a fixing hole 73a.
A fastening hole 76b corresponding to ca and a notch 76c corresponding to the notch 73cb are formed.

Next, the assembly of the damper will be described. First, after filling the working chamber 73a with silicon oil, the rotor 72, the main shaft 74, the O-ring 75, and the lid 76 are assembled in this order in the rotor housing 73. Then, by fixing the lid body 76 to the rotor housing 73 with the screw 77, the assembly of the damper 71 is completed. The detailed configuration and assembly are described in the rotary piston type rotary damper (Japanese Patent Application No. 4-262705) previously proposed by the present applicant, so refer to it.

Next, the mounting of the damper will be described. First, the damper 71 is attached with a screw or the like to the side surface of the seat portion 31 using notches 76c and 73cb so that the recess 74aa of the main shaft 74 is opened to the outside as shown in FIG.
Then, the support shaft 1 formed into a shape that fits into the recess 74aa.
The chair is assembled by fitting the tip of 1 into the recess 74aa. A damper 71 is also arranged between the backrest 1 and the seat portion 31 located on the front side in FIG.

Next, the operation will be described with reference to FIGS. 3 and 4. First, the coil spring 5 stretched between the locking pin 21 and the stopper pin 41 when not seated.
The seat portion 31 is rotated counterclockwise around the support shaft 11 by the urging force of 1, and the stopper pin 41 abuts against the portion A of the backrest 1 (the lower end portion of the arc hole 2). Maintains the standing state shown in FIG.

When the seat portion 31 is rotated clockwise about the support shaft 11 against the biasing force of the coil spring 51 for seating, the stopper pin 41 rotates while extending the coil spring 51. Since it abuts against the portion B of the backrest 1 (the upper end portion of the arc hole 2), the seat portion 31 is in the lying state shown in FIG. When the seat portion 31 is laid down in this manner, since the damper 71 is provided between the support shaft 11 and the seat portion 31, the turning force for rotating the seat portion 31 is braked by the damper 71. The seat 31 is gently laid down.

By placing the buttocks on the seat portion 31 in the laid-down state shown in FIG. 4, the seat portion 31 can be maintained in the laid-down state by the weight of the person sitting on the seat portion 31. Next, when the buttocks are separated from the seat 31 to stand up, the seat 3
1 rotates counterclockwise about the support shaft 11 by the urging force of the coil spring 51, and the stopper pin 41 abuts against the portion A of the backrest 1. Therefore, the seat portion 31 is in the standing state shown in FIG.
The standing state is maintained by the urging force of the coil spring 51. When the seat portion 31 stands up like this, since the damper 71 is provided between the support shaft 11 and the seat portion 31, the turning force for rotating the seat portion 31 is braked by the damper 71.
The seat portion 31 stands up gently.

As described above, according to the embodiment of the present invention, since the damper 71 is provided between the support shaft 11 and the seat portion 31, the turning force for rotating the seat portion 31 is braked, The seat portion 31 rotates gently. Therefore, a part of the seat portion 31 does not hit the back side or the buttocks of the user's thighs, and even if the seat portion 31 strikes the backrest 1, a large abutting sound does not occur, which improves usability. Further, since the damper 71 does not have the directionality of the braking force, the intended purpose can be achieved by using an inexpensive damper.

In the above-mentioned embodiment, the example in which the damper 71 which does not give directionality to the turning power for braking is used is explained, but a damper for braking only the braking force for rotating the seat portion 31 in the standing direction is used. You may use. By using a damper having a directional braking force, braking is not applied to the braking force that causes the seat portion 31 to lie down. It becomes easier to lie down. Also, although chairs used in theaters, movie theaters, halls, etc. have been described as an example, by rotating the backrest and fixing the seat part, it can be applied to reclining seats of automobiles, etc. Needless to say.

[0023]

As described above, according to the present invention, since the damper for braking the rotational force for rotating the seat portion is provided, the rotational force for rotating the seat portion is braked and the seat portion is rotated. Rotates gently. Therefore, a part of the seat does not hit the back of the user's thigh or the buttocks, and even if the seat abuts against the backrest, a large hitting sound is not generated and the usability is improved. Also, since the damper does not have a directionality of braking force,
The intended purpose can be achieved by using an inexpensive damper.

Further, since the damper is adapted to brake only the rotational force for raising the seat portion, only the rotational force for rotating the seat portion in the standing direction is braked, and the braking force for lowering the seat portion is braked. It will not be worn. Therefore, the seat portion can be easily laid down even though the damper is used.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a chair that is an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing an example of the configuration of the damper shown in FIG.

FIG. 3 is an explanatory diagram showing a configuration of a main part of a conventional chair and a state in which a seat portion stands up.

FIG. 4 is an explanatory view showing a configuration of a main part of a conventional chair and a state in which a seat is laid down.

[Explanation of symbols]

 1 Backrest 2 Arc Hole 11 Support Shaft 21 Locking Pin 31 Seat 41 Stopper Pin 51 Coil Spring 61 Cover 71 Damper

Claims (2)

[Claims] 1. A chair in which when the seat portion is laid down and is erected from a seated state, the seat portion is rotated around the support shaft by the urging force of the urging member and is erected. A chair that is provided with a damper that brakes the turning power. 2. The chair according to claim 1, wherein the damper brakes only the turning force that erects the seat portion.