JPH01124408A - Revolving chair - Google Patents

Abstract

PURPOSE: To automatically restore a seat part to a preset direction by rotating a seat part centering the axial line of the support shaft inclined with respect to the axial line of a shaft cylinder to set the center of gravity thereof to the position eccentric with respect to the support shaft. CONSTITUTION: A lower bearing 5 is fixed to the inside of a shaft cylinder 2 and an upper bearing 6 is fixed to the upper end thereof and bearings 7, 8 are mounted on bearings 5, 6 at the position eccentric from the axial line (b) of the shaft cylinder 2 and a support shaft 4 is inclined by the upper and lower bearings 7, 8 to be supported in a rotatable manner. A bottom lid 9 is fixed to the lower part of the lower bearing 5 and a steel ball 12 is interposed between the recessed part 10 formed to the center of the lower end of the support shaft 4 and the recessed part 11 formed at the position of the bottom lid 9 corresponding to the recessed part 10 to prescribe the downward movement of the support shaft 4 to smoothly rotate and support the support shaft. The attaching body 15 fixed to the under surface of the seat part 3 having a seat plate 13 and a backrest is fixed to the upper part of the support shaft 4. The center-of- gravity point G of the seat part 3 is set to a position eccentric from the support shaft 4 and the backrest 14 is set to a state made almost parallel along a desk and, when a sitting person is separated from a chair, the backrest 14 is always restored almost in parallel to the front edge of the desk.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the improvement of a rotating chair in which the seat can be rotated with respect to the footrest, and more specifically, the present invention relates to an improvement in a rotating chair in which the seat can be rotated with respect to the footrest. This invention relates to a rotating chair that can be restored to its original state.

[Conventional technology]

A conventional rotating chair has a support shaft rotatably or non-rotatably suspended from a shaft cylinder installed on a leg base, and a seat is connected to the support shaft in a non-rotatable or rotatable manner so that the seat can be attached to the base. When the seated person leaves the seat, the seated person rotates the seat and stands up with his or her feet pointing to the side from the foot space of the desk, etc. Since the backrest remains facing sideways, the backrest faces the desk in a messy direction, especially in conference rooms where a large number of chairs are arranged, resulting in a poor appearance. On the other hand, there is a rotating chair that has a built-in restoring device that has a spring disposed inside the leg stand or in a shaft cylinder installed upright on the leg stand, so that the spindle is always elastically biased in the direction of returning to its initial state. However, all of them have complex structures and require many assembly processes, which increases manufacturing costs.Also, because they have complex mechanisms, they are prone to breakdowns due to aging, and wear and tear of the sliding parts. There was a risk that the seat part would not only not rotate smoothly, but also not be completely restored to its initial state.

[Problem that the invention seeks to solve]

In view of the above-mentioned situation, the present invention aims to solve the problem by being able to automatically restore the seat to a preset direction no matter what rotation angle the seat is left at rest, and which has a simple restoring mechanism. To provide a rotary chair that is structurally strong and that can minimize cost increases compared to ordinary rotary chairs.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a seat in which a support shaft is rotatably or non-rotatably installed obliquely in a shaft cylinder suspended from a floor or a footrest, and a seat plate and a backrest are provided at the upper end of the support shaft. A rotary chair is constructed in which the seats are arranged in a non-rotatable or rotatable manner and the center of gravity of the seat is set eccentrically with respect to the support shaft.

[Effect]

The rotary chair of the present invention having the above-mentioned features is such that when the seat portion is freely rotated around the axis of the shaft tube suspended from the floor or the footrest, that is, the axis of the support shaft inclined with respect to the vertical line, By setting the center of gravity of the seat at a position eccentric to the support shaft, the center of gravity of the cough seat moves in the direction that minimizes its potential energy, that is, the center of gravity of the seat moves in the direction in which the support shaft is inclined. The seat rotates until it is in position, and the seat remains stationary in that state.

〔Example〕

Next, the present invention will be further described in detail based on embodiments shown in the accompanying drawings.

Fig. 1 shows a rotary chair of the present invention, and Fig. 2 shows main parts of a typical embodiment, in which 1 is a footrest, 2 is a shaft cylinder, 3 is a seat,
4 indicates the supporting shafts.

In the rotary chair of the present invention, a support shaft 4 connecting a seat 3 is attached at an angle to a shaft tube 2 vertically disposed on a leg base 1, and the seat 3 is attached to the support shaft 4 with respect to the leg base 1. The cough seat is rotatable about an axis a, and the center of gravity G of the cough seat is set eccentrically from the support shaft 4.

More specifically, a lower bearing 5 is fixed inside the shaft cylinder 2, an upper bearing 6 is fixed to the upper end, and each bearing 5, 6 has a bearing at a position eccentric from the axis of the shaft cylinder 2. 7.8, the support shaft 4 is tilted and rotatably supported by the upper and lower bearings 7.8, and the bottom M9 is fixed below the lower bearing 5 in the shaft cylinder 2.
A recess lO is formed at the center of the lower end of the support shaft 4, and a recess 11 is formed at a position of the bottom cover 9 corresponding to the recess 10.
A steel ball 12 is interposed between them to restrict the downward movement of the support shaft 4 and to smoothly rotate and support it, and the upper end of the support shaft 4 protruding from the shaft tube 2 is provided with a seat plate 13 and a backrest. A mounting body 15 fixed to the lower surface of the seat portion 3 having a mounting body 14 is fixed in a non-rotatable manner.

Further, in another embodiment shown in FIG. 3, a mounting tube 16 is fitted onto the upper end of the shaft tube 2 which is vertically hung on the foot stand 1 in the same manner as described above, and which is integrally connected with the support shaft 4 at the top thereof. A circular hole 17 through which the support shaft 4 is inserted in the center is formed approximately in the center of the mounting body 15 which is fixed to the lower surface of the seat 3 and is unrotatably connected by suitable means such as fitting or screwing. A supporting bearing 19 having a thrust bearing 18 formed around the lower surface thereof is supported and fixed by a cylindrical reinforcing ring 20 formed around a flange, and the thrust bearing 18 of the supporting bearing 19 is attached to the upper end of the mounting cylinder 16. The upper surface of the closed stop plate 21 is positioned around the support shaft 4, and the support shaft 4 is inserted into the circular hole 1.
7, and the E-ring 22 is fitted to the tip of the support shaft 4 protruding from the circular hole 17 to prevent it from being removed, thereby making the support shaft obliquely disposed in the shaft tube 2 so as not to be rotatable. Seat part 3 against 4
are rotatably connected.

Incidentally, if the center of gravity G of the seat 3 can be set at a position eccentric from the support shaft 4, the seat plate 13 of the seat 3 can be connected at a substantially right angle to the axis a of the support shaft 4. You can also set
Further, it can be installed in a row substantially perpendicular to the axis of the shaft tube 2, and the installation angle can be set as appropriate.

Thus, in the rotary chair of the present invention, the angle θ of the axis a of the support shaft 4 rotatably connected to the seat portion 3 with respect to the axis of the shaft tube 2 vertically disposed on the floor or the footrest l is set at a predetermined angle. Since the center of gravity G of the seat 3 is set at a position eccentric from the support shaft 4, if the seat 3 is freely rotated around the axis a of the support shaft 4, The seat 3 always automatically returns to the state in which the center of gravity G is located in the diagonal direction of the support shaft 4, and by setting the center of gravity point G to the starting state, that is, the backrest 14 can be moved along the desk, etc. By setting the seats so that they are approximately parallel to each other, when the seated person leaves the chair, he or she rotates the seat part 3 by a predetermined angle, puts his or her feet out of the space on the desk, etc., stands up, and uses the cough seat. If the rotational force applied to part 3 is released,
The center of gravity G of the seat 3 is at IIJ of the support shaft 4! By rotationally moving in an oblique direction, the backrest 14 is always restored to be substantially parallel to the front edge of the desk or the like.

〔Effect of the invention〕

According to the rotary chair of the present invention as described above, the support shaft is rotatably or non-rotatably disposed obliquely on the shaft cylinder suspended from the floor or the footrest, and the seat plate and the backrest are provided at the upper end of the support shaft. The seat is arranged in a non-rotatable or rotatable manner, and the center of gravity of the seat is set eccentric to the support shaft, so the seat can be rotated to any angle and left still. The seat can always automatically return to its initial state, that is, the state in which the inclination direction of the support shaft and the center of gravity of the cough seat match, even if the seat is suspended from the floor or footrest. It has a simple structure in which the support shaft, which rotatably connects the seat part with the seat plate and backrest, is attached to the shaft cylinder at an angle, so the number of parts is small and compared to the conventional swivel chair. Since only the process of installing the spindle at an angle has been added, the manufacturing process can be done between the tracks, thereby minimizing the increase in cost.In addition, the structure is simple and strong. Things you can do,
It is highly durable and does not change over time.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of the rotary chair of the present invention, and FIG.
FIG. 3 is a longitudinal cross-sectional view of the main parts showing the second embodiment. 1: Leg stand, 2: Shaft cylinder, 3: Seat, 4: Support shaft, 5: Lower bearing, 6: Upper bearing, 7: Hair ring, 8: Bearing,
9: Bottom cover, 10: Recess, 11: Recess, 12: Steel ball, 13
: seat plate, 14; backrest, 15: mounting body, 16: mounting tube,
17: Circular hole, 18 Nilast hair ring, 19: Support bearing, 20: Reinforcement ring, 21: Stop plate, 22: E ring.

Claims (1)

[Scope of Claims] 1) A support shaft is rotatably or non-rotatably installed obliquely in a shaft cylinder suspended from the floor or a footrest, and a seat having a seat plate and a backrest at the upper end of the support shaft is unrotatable. or rotatably connected,
A rotary chair characterized in that the center of gravity of the seat is set eccentrically with respect to the support shaft. 2) The rotary chair according to claim 1, wherein the center of gravity of the seat is set on the backrest side behind the support shaft.