JPH064744Y2 - Restoration device in swivel chair - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a restoring device in a swivel chair having a rotatable seat portion. More specifically, the rotated seat portion is automatically set to a set position. The present invention relates to a restoration device that can return to rotation.

[Conventional technology]

A conventional restoring device in a swivel chair usually has two pairs of bearings fixed at intervals in a shaft cylinder standing on a pedestal, etc., and the bearings define a support shaft connecting a seat portion to the upper end. Positionally rotatable or vertically slidable and rotatably supported, the inner surface of the upper or lower bearing is a slanted surface, and an annular member that is rotationally engaged with the slanted surface is slidable vertically on the support shaft. Alternatively, there is provided a structure in which the annular member is fixed to the slanted surface by a compression spring while being integrally fitted to the rotation of the support shaft by being improperly fitted. In order to fix the bearing accurately and firmly, not only an internal structure for fixing the bearing in the shaft cylinder is required, but especially the mounting work of the lower bearing is extremely difficult, and the bearing is externally fitted to the support shaft. It takes a lot of time to process the annular member, and it is especially slidable up and down with respect to the spindle. To so as to be integrated with respect to rotation to form or flats drilling flutes to support shaft,
It is necessary to make holes according to the cross-sectional shape, which tends to increase the cost. Furthermore, since the shaft cylinder is required to be mounted with high strength, it is usually welded to the footrest, so other structures or standards are required. In order to mount it on the foot stand, it had to be incorporated into the barrel at the same time when the foot stand was manufactured, and disassembly and repair and replacement of parts were difficult.

[Problems to be solved by the invention]

In view of the above-mentioned situation, the present invention is to solve the problem that the support shaft can be rotated without rattling with respect to the shaft cylinder although the assembly and disassembly are easy and the parts can be replaced very easily. It can be firmly attached to the seat, and the seat can be automatically rotated and restored to a preset initial state smoothly, and the axial length can be shortened to cut it, making it a footrest of other structure and standard. The point is to provide a restoration device in a swivel chair that can be easily applied.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention forms a circular hole at the center of the case upper end of a bottomed cylindrical body that can be detachably attached to the upper end of a shaft cylinder standing on a floor or a foot stand. A support shaft having a slanted surface formed around the lower surface thereof, a bearing having an engaging portion formed by making an upward cut in the uppermost portion of the slanted surface is detachably attached, and a seat portion is continuously provided at the upper end portion. Rotatably inserting the large diameter part of the case into the circular hole, and inserting the lower end of the small diameter part integrally connected to the center of the lower surface of the large diameter part into the support hole opened at the center of the bottom plate of the case An engagement member that is fitted with a locking tool for preventing the projection from slipping off, slides on the inclined surface at an appropriate position on the side surface of the large diameter portion, and is engageable with the engagement portion. The compression spring is fixed between the bottom surface of the large diameter portion and the bottom plate with a thrust bearing interposed around the small diameter portion. I have configured in restoring apparatus swivel chair comprising Te.

In addition, the upper part of the slanted surface of the bearing is formed with an upward notch to form the engaging portion, and the engaging member can be engaged with the engaging portion, so that the engaging member is engaged. The seat does not rotate unnecessarily in the initial state in which the seat is engaged,
When the seat portion is restored to rotation, the engaging member passes through the engaging portion due to its rotational inertial force, but when the engaging member passes through the engaging portion, a rotational resistance force is applied to the support shaft. , The vibration of the seat is quickly absorbed and stopped in the initial state.

[Action]

The restoring device in the swivel chair of the present invention having the above contents is such that the seat portion is continuously connected to the upper end portion by the bearing fixed to the upper end of the case detachably attachable to the upper end of the barrel and the bottom plate of the case. A rotatably supporting support shaft is supported, and an engaging member fixed to a side surface of a large diameter portion of the support shaft is positioned at the uppermost part of a slanted surface formed around the lower surface of the bearing. With the rotation of the seat portion, that is, the rotation of the support shaft, the engaging member causes the upward elastic force of the compression spring arranged via the thrust bearing between the lower peripheral surface of the support shaft and the bottom plate of the case. When the bearing member is moved downward together with the support shaft and the rotational force applied to the seat portion is released in that state, the elastic force of the spring causes the engaging member to slide while supporting the slanted surface. It rotates upward with the shaft and restores to the initial state. Then, the support shaft sinks against the compression spring due to the weight of the seated person, the engaging member is separated from the slanted surface, and the support shaft or seat portion can freely rotate. is there.

〔Example〕

The present invention will be further described in detail with reference to the embodiments shown in the accompanying drawings.

FIG. 1 shows a swivel chair to which the restoration device of the present invention is attached, and FIGS. 2 to 4 and 6 show a first embodiment of the present invention, in which A is a swivel chair and B is a restoration. Each device is shown.

In the swivel chair A, a restoring device B of the present invention is detachably attached to an upper end of a shaft cylinder 2 erected on a pedestal 1, and an attaching body 4 fixed to an upper end portion of a support shaft 3 installed in the restoring device B. The seat 5 is attached via the backrest 6, the backrest 6 is attached to the seat 5, and an armrest 7 is provided if necessary, and the seat 5 can be rotated by the restoring device B. The orientation of the seat 5 is automatically restored to a preset initial state.

As shown in FIGS. 2 and 3, the restoring device B is based on the footrest 1
A cylindrical hole 9 for rotatably inserting the support shaft 3 is formed in the center of the upper end of a case 8 of a bottomed cylindrical body which can be detachably attached to the upper end of a shaft cylinder 2 erected on the lower surface. A bearing 11 having a slanted surface 10 is detachably attached to the bottom plate 12 of the case 8 by a screw or the like, and a support hole 13 is opened at the center of the bottom plate 12 of the case 8. A mounting part 15 for connecting the mounting body 4 mounted on the lower surface of the seat 5 to the upper part.
And the small diameter portion 16 is formed at the center of the lower surface of the large diameter portion 14.
The large diameter portion 14 is inserted into the circular hole 9 of the bearing 11, the lower end portion of the small diameter portion 16 is inserted into the support hole 13 of the bottom plate 12, A retaining member 17 for preventing slipping is fitted to the lower end of the small diameter portion 16 to rotatably and slidably supported downward, and the inclined surface 10 of the bearing 11 is placed on the side surface of the large diameter portion 14 at an appropriate position. A sliding engagement member 18 is detachably fixed by screws or the like, and a thrust bearing 19 is interposed between the bottom surface of the large diameter portion 14 and the bottom plate 12 around the small diameter portion 16 of the support shaft 3. Then, the compression spring 20 is wound and mounted, and the engaging member 18 fixed to the support shaft 3 is always elastically biased in the direction of contacting the slanted surface 10.
The engagement member 18 has an inner surface which is a concave curved surface that can be brought into close contact with a part of the large diameter portion 14 of the support shaft 3, and the inclined surface 10 of the bearing 11.
It has a shape in which the upper surface that abuts against is inclined in a mountain shape symmetrically from the center to the side, and the inclination angle thereof is substantially matched with the inclination angle of the slanting surface 10.

Then, in order to mount the restoration device B of the present invention on the shaft cylinder 2 which is erected on the pedestal 1, for example, a connecting portion 21 is formed at the upper end of the shaft cylinder 2 so that an outwardly opening taper is provided in the upper end opening. Then, a fixing portion 22 is formed on the outer surface of the lower half portion of the case 8 with a taper having a diameter reduced downward, and the fixing portion 22 is fitted into the connecting portion 21 of the shaft tube 2 so as to be detachably connected. However, an appropriate connection structure can be adopted. In addition, a plurality of holes or screw holes are formed in the shaft tube 2 at regular intervals so that the height of the seat portion 5 can be adjusted, and screws or projections screwed or engaged with the case 8 are formed. Can also be engaged.

Further, an inverted V-shaped notch is formed further upward at the uppermost portion of the slanted surface 10 to form an engaging portion 23 for receiving the upper end of the engaging member 18.

Thus, the restoring device B of the present invention has the slanted surface of the bearing 11.
Starting from the state in which the upper surface of the engaging member 18 is in abutting engagement with the uppermost engaging portion 23 of 10, the seat portion 5 connected to the upper end of the support shaft 3 is rotated to rotate the case 8 Bearings fixed in 11
The support shaft 3 supported by the base plate 12 and the bottom plate 12 rotates, the engaging member 18 rotates in accordance with the rotation, and the engaging member 18 slides on the slanted surface 10 to cause the compression spring. 20
When the seat 5 is released by releasing the stress on the seat 5 in this state by sliding downward together with the support shaft 3 against the elastic force of the engaging member 18, the elastic force of the compression spring 20 causes the engaging member 18 to move upward. The engaging member 18 is pressed and slid upward by the pressing force while sliding on the slanted surface 10 while sliding in contact with the slanted surface 10, and the supporting shaft 3 is rotated in accordance with the rotation. The seat portion 5 is restored to the preset state in the initial state. Further, when the seat portion 5 is further rotated and rotated in the opposite direction, that is, 180 ° as shown in FIG. 4, it becomes a dead point, but when it exceeds it, it is automatically restored to the initial state as described above. To do. Therefore, if the rotation angle of the seat portion 5 from the starting state is within 180 °, the seat portion 5 is reversely rotated,
If it is more than °, it will be automatically restored to the initial state by forward rotation.

When seated on the seat portion 5, the support shaft 3 sinks downward due to the weight of the seated person against the elastic force of the compression spring 20. In this case, the weight of the seated person and the compression spring
The elastic force of 20 is balanced, or the compression spring 20 is completely compressed and is supported by the axial thickness of the compression spring 20 itself. In this state, the engaging member 18 is the bearing 11 The supporting shaft 3 is separated from the slanted surface 10 of
Becomes free to rotate, and when the seated person stands up from the swivel chair A, the support shaft 3 rises in the same manner as described above, and the elastic force of the compression spring 20 causes the seat portion 5 to rotate and restore. Is.

Also, as shown in FIGS. 5 and 6 as the second embodiment of the present invention, the engaging portion 23 is formed by further forming an inverted V-shaped notch at the uppermost portion of the slanting surface 10 as described above. To prevent the seat 5 from rotating unnecessarily while the engagement member 18 is positioned in the engagement part 23, that is, in the state where the seat 5 is oriented to the starting state. When the seat portion 5 is rotated and restored, the engagement member 18 passes through the engagement portion 23 to impart a rotational resistance force to the support shaft 3 to quickly absorb the vibration of the seat portion 5 and start the operation. Can be stationary in a state.
Further, in the present embodiment, the compression spring 20 is formed in a wide plate shape so that the compression spring 20 does not bend laterally when the compression spring 20 is in a fully contracted state. The downward impact force due to the weight is absorbed by the impact member 24 provided on the bottom plate 12 of the case 8.

[Effect of device]

According to the restoration device for the swivel chair of the present invention as described above, the center is provided at the upper end of the case of the bottomed cylindrical body that can be detachably attached to the upper end of the shaft cylinder standing on the floor or the foot stand. A circular hole is formed and a beveled surface is formed around the lower surface, and a bearing having an engaging portion formed by making a notch upward at the uppermost portion of the beveled surface is detachably attached, and a seat portion is provided at the upper end portion. A large-diameter portion of a support shaft continuously connected to the circular hole is rotatably inserted, and a lower end of a small-diameter portion integrally connected to the center of the lower surface of the large-diameter portion is opened at the center of the bottom plate of the case. It is inserted into the hole and fitted with a locking tool for preventing it from falling out at the lower end protruding portion, and slides on the inclined surface at an appropriate position on the side surface of the large diameter portion and engages with the engaging portion. A possible engagement member is fixed, and a thrust bearing is interposed around the small diameter portion between the bottom surface of the large diameter portion and the bottom plate. Since the compression spring is arranged, the support shaft can be rotatably and firmly supported by the bearing detachably attached to the upper end of the case and the support hole 13 opened in the bottom plate. Since the engaging member that slidably engages the cutting surface is fixed to the large diameter portion of the support shaft, the structure is simple, the manufacturing process is easy, and it is strong.
When assembling, fix the engaging member with the large diameter portion of the support shaft inserted into the circular hole of the bearing, and insert the bearing with the thrust bearing and the compression spring inserted into the small diameter portion of the support shaft. It is fixed to the upper end of the case with screws, etc., the tip of the small diameter part is inserted into the support hole opened in the bottom plate of the case, and the locking tool for retaining is fitted to the part protruding downward from the support hole. It can be assembled very easily by simply attaching the case to the upper end of the shaft cylinder standing upright on the leg stand etc., so it is easy to disassemble if a failure occurs during use. It is possible to repair or replace parts. In addition, since the restoration device of the present invention is compactly configured in the case, it can be easily mounted on a footrest having another structure and regulation, which contributes to a reduction in manufacturing cost. Then, the seat portion continuously connected to the upper end of the support shaft is rotated from the initial state, and the engaging member fixed to the support shaft is slid on the slanted surface of the bearing, and is moved downward against the elastic force of the compression spring. If the rotational force applied to the seat portion is released and allowed to stand still in the state of being moved to, the engaging member is pressed upward by the elastic force of the compression spring, and the sliding surface slides on the slanted surface. It rotates up to the uppermost part of the slanted surface, the rotation of the support shaft increases accordingly, so that the seat can be smoothly restored to the initial state, and in the initial state when the engaging member engages with the engaging portion. The seat part is stable because it does not rotate unnecessarily, and when the seat part is restored by rotation, the engaging member passes through the engaging part due to its rotational inertial force. When passing through the joint, the spindle receives rotational resistance and quickly absorbs vibration of the seat. It can be stationary in the initial state and.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall perspective view of a swivel chair to which a restoring device of the present invention is attached, and FIG. 2 is a longitudinal sectional view of a main part including the restoring device of the first embodiment of the present invention. 3 is an exploded perspective view of the restoring device of the first embodiment, FIG. 4 is a vertical sectional view of the state in which the support shaft is rotated 180 ° from the state of FIG. 2, and FIG. 5 is the restoring device of the second embodiment. 6 is a perspective view of a bearing common to the first and second embodiments. FIG. A: swivel chair, B: restoration device, 1: pedestal, 2: shaft cylinder, 3: support shaft, 4: mounting body, 5: seat part, 6: backrest, 7: armrest, 8: case, 9: Circular hole,
10: Inclined surface, 11: Bearing, 12: Bottom plate, 13: Support hole, 14: Large diameter part, 15: Mounting part, 16: Small diameter part, 17: Locking tool, 18: Engaging member, 19: Thrust Bearing, 20: compression spring,
21: connecting part, 22: fixed part, 23: engaging part, 24: cushioning member.

Claims (1)

[Scope of utility model registration request] 1. A circular hole is formed in the center and a slanting surface is formed around the lower surface of the case upper end of a bottomed cylindrical body that can be detachably attached to the upper end of a shaft cylinder erected on a floor or a foot stand. A large diameter portion of a support shaft, which is formed and has an engaging portion formed by making a notch upward at the uppermost portion of the slanted surface, is detachably attached, and a large diameter portion of a spindle that continuously connects a seat portion to the upper end portion is formed into the circle. The lower end of the small-diameter portion, which is rotatably inserted in the hole and integrally connected to the center of the lower surface of the large-diameter portion, is inserted into the support hole opened in the center of the bottom plate of the case and is prevented from coming off from the lower-end protruding portion. The locking member is fitted, and the slidable surface is slid on an appropriate position on the side surface of the large diameter portion, and the engaging member engageable with the engaging portion is fixed to the large diameter portion. A compression spring is arranged by interposing a thrust bearing around the small diameter portion between the lower peripheral surface and the bottom plate. Rolling in restoring device in a chair.