JPH0136436Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Fields of Use The present invention is applicable to a chair having a rotatable seat at the upper end of a support, such as a counter chair, a chair installed in front of a pachinko machine in a pachinko game parlor, etc. The present invention relates to a chair equipped with a restoring device so that the chair always faces in a predetermined direction even if the chair is rotated in a desired direction.

Prior art Utility model registration No. 1373422 owned by the applicant
The ``Device for Restoring the Seat of a Chair'' (Utility Model Publication No. 55-28120) has a smooth restoring action, is easy to manufacture, and is convenient for transportation and storage, and has been very well received. Because the chair seat is rotated back using the restoring force of elastic materials such as rubber, it may not always be returned to its original position accurately, and the seat may end up in a position that is slightly deviated from the desired direction. When the chair rotates back and a large number of chairs are arranged in a row, the rows may become disordered and the appearance may be spoiled.

In order to solve the above-mentioned difficulties, the applicant of the present application has already proposed an improvement plan as a ``chair seat restoring device'' in Utility Application No. 11644/1980, but this improvement plan involves a ring-shaped retainer provided at the upper end of the support. Since the locking member is constantly pressed by the plate-shaped spring means, depending on the material of the plate-shaped spring means, for example, in the case of a metal plate, the annular locking member may wear out due to friction, and the restoring action may not be achieved. In some cases, a situation has arisen in which the process is not carried out properly. Further, since the plate-shaped spring means has an open portion, there is a problem that the pressing force of the spring is not evenly applied to the annular locking member.

Problems to be solved by the invention The present invention was devised by focusing on the above-mentioned points, and further improves the conventional chair seat restoring device.
It is an object of the present invention to provide a chair equipped with a restoring device that can be accurately restored to its original position and that can uniformly apply a pressing force to the annular locking member without causing wear of the annular locking member. do.

Means to Solve the Problem The gist of the present invention is to fix a mounting plate to the lower surface of the chair seat, and install a sliding member on the lower surface of the mounting plate so that it can slide freely and is biased in a predetermined direction. A receiver is provided inside the upper end of the column, a cylindrical member is provided protruding from the lower surface of the sliding member, an annular groove is bored in the upper part of the cylindrical member, and a bolt inserted from the outside of the column is inserted into the annular groove. It protrudes into the groove, and one end is inserted into a blind hole provided on the lower surface of the cylindrical member between the receiving tube and the cylindrical member and fixed with a shaft, and the engaging portion with a square cross section at the other end is movable up and down. An annular locking member having a locking surface formed in a direction that coincides with a predetermined direction of the chair seat and a sliding surface other than the locking surface is attached to the bottom of the receiving cylinder. An elastic rectangular frame made of synthetic resin is attached to the lower surface of the sliding member so as to be provided near the upper end of the column so as to constantly hold and press the annular locking member. A chair equipped with a restoring device characterized in that the chair seat is always urged to be positioned in a predetermined direction by pressure.

Embodiment An embodiment of the present invention will be described below based on the accompanying drawings.

In the figure, reference numeral 2 denotes a cylindrical support of a chair, which has a base plate or a support post at its lower end, or stands upright from the floor. The pillar 2
A receiving tube 4 is fitted inside the upper end portion of the housing.
The lower end portion of the receiving tube 4 is a locking tube portion 6 having a rectangular cross section.

Reference numeral 7 denotes a mounting plate attached to the center of the lower surface of the chair seat 10, and opposing guide grooves 9, 9 on the lower surface of the mounting plate 7 align in a predetermined direction, that is, the direction in which the chair seat 10 faces directly. It is formed in the direction. 11
is a sliding member that is slidably installed in the guide grooves 9, 9, and is biased by a spring means S in a predetermined direction, that is, in a direction in which the chair seat 10 faces directly. If this configuration is adopted, when a seated person stands up from a chair, the chair seat 10 resists the force of the spring means S.
When the user stands up and leaves the chair by pushing the user backward, the user moves to the front of the chair seat 10 due to the biasing force of the spring means S and returns to the original position. Therefore, the chair seat 10 only moves backwards when getting off the chair, so there is an advantage that the space can be used more effectively.

Reference numeral 8 denotes a short cylindrical member vertically disposed on the lower surface of the sliding member 11, and an annular groove 12 is bored in the outer peripheral surface of the intermediate portion of the cylindrical member 8. The cylindrical member 8 is rotatably fitted into the upper end portion of the receiving tube 4, and a bolt 14 inserted from the outside of the column is inserted into the annular groove 12 to prevent the cylindrical member 8 from coming off upward. There is. A stopper 1 is provided inside the annular groove 12.
6 is provided in a protruding manner to limit the rotation range of the chair seat portion 10.

A blind hole 18 that opens downward is formed in the lower center of the cylindrical member 8. Reference numeral 20 denotes an elastic member made of synthetic rubber, styrene resin, or other elastic material, and is configured such that it can fit into the cylindrical elastic member main body 22 that can be inserted into the blind hole 18 and the locking cylinder part 6. The elastic member body 22 includes an engaging portion 24 having a rectangular cross section and formed at the lower end portion of the elastic member main body 22. The elastic member body 22 is inserted into the blind hole 18 and the shaft 26
On the other hand, the engaging portion 24 is fitted into the locking cylinder portion 6 so as to be vertically movable.

28 is an annular locking member fitted to the upper end portion of the receiving tube 4, and a locking surface 30 is formed on the side surface thereof in a predetermined direction, that is, in a direction that corresponds to the direction in which the chair seat 10 faces directly. The side surface other than the locking surface 30 is a sliding surface 32. The material for the annular locking member 28 is preferably a synthetic resin with good sliding properties and good abrasion resistance, such as acetal resin (trade name: Diuracon).

34 is a rectangular frame body, and a rectangular frame body 3
3, and a long hole 35 formed on the upper surface of the front end frame 33a of the frame body 33 and on the lower surface of the sliding member 11.
Attachment part 3 attached by screw 36 through
7, and side walls 11a of the sliding member 11 formed on both upper surface portions of the rear end frame 33b of the frame body 33.
It has locking portions 38, 38 that lock into. Since the rectangular frame 34 is fixed through the elongated hole 35, loosening the screw 36 releases the annular locking member 2.
The position can be adjusted relative to 8. In the square frame body 34, both side frames 33c, 33c of the frame main body 33 are always engaged with the annular locking member 28, and in a stationary state, the locking surface 30 is pressed to move the chair seat 10 in a predetermined direction. The side frames 33c, 33c are installed facing in a predetermined direction, that is, in a direction that coincides with the direction in which the chair seat 10 faces.
The material of the rectangular frame 34 is elastic, and the both side frames 33c, 33c are connected to the annular locking member 2.
Any material can be used as long as it acts as a pressing spring against the material 8, but it is preferable to use synthetic resin, such as ABS resin, polycarbonate, or nylon.
The shape of the square frame 34 may be a square, a rectangle, or the like, as long as it can hold and press the annular locking member 28, but as shown in the figure, the side walls 33c, 33c are slightly inward. The curved shape has the advantage that the pressing force is better applied to the annular locking member 28.

The locking surface 30 is normally a flat surface since it is sufficient that the chair seat 10 is locked and fixed while facing in a predetermined direction and does not rotate any further when pressed by the side frames 33c, 33c. However, as long as the function is not lost, it is also possible to form a recessed part in the flat surface for escape from the viewpoint of saving materials. Further, the sliding surface 32 functions to apply a pressing force so that the chair seat portion 10 returns and rotates when pressed by the side frames 33c, 33c, and cooperates with the side frames 33c, 33c. Any surface may be used as long as it works and returns, but it is preferably a circularly curved surface to ensure smooth rotation. Although the illustrated example shows an example in which the annular locking member 28 is fitted as a separate member to the upper end portion of the receiver tube 4, the annular locking member 28 and the receiver tube 4 may be integrally formed. It is also possible to adopt a configuration. In short, the annular locking member 28 only needs to be located near the upper end of the support column 2 and operate in cooperation with the rectangular frame 34.

Operation With the above configuration, the support column 2, the receiving tube 4, and the annular locking member 28 are integrally maintained in a stationary state at all times. On the other hand, the chair seat 10 and the mounting plate 7
The sliding member 11, the cylindrical member 8, and the rectangular frame 34 are also integral and rotatable. The upper end of the elastic member 20 is fixed to the cylindrical member 8, and the engaging portion 24 at the lower end of the elastic member 20 is non-rotatably fitted into the locking cylinder portion 6 of the receiving cylinder 4.
Therefore, in the seat portion 10, the elastic member 20 does not twist unless a rotational force is applied, and the plate spring means 3
4 is stationary without opening and facing a predetermined direction. However, when the seat portion 10 is rotated, the elastic member 20 is twisted between the fixed upper end and the fitted portion at the lower end due to the rotational force, and the annular locking member 28 is rotated, thereby causing the plate The shaped pressing portion 38 is forcibly opened and comes into engagement with the sliding surface 32.
If no rotational force is applied from this state, the elastic member 2
Due to the restoring force of 0, the chair seat 10 returns to its original direction and rotates, and at the same time, the rectangular frame 34 similarly performs the return rotation action while sliding on the curved sliding surface 32 due to the restoring force. , will head in the original predetermined direction. At this time, with conventional restoration equipment,
Since only the restoring action of the elastic member 20 was required, there were cases where it was not always possible to return to the original position accurately, but according to the present invention, the elastic member 20
In addition to the restoring action, the cooperative action of the rectangular frame 34 and the annular locking member 28 makes it possible to accurately return to the original position. 90% of the restoring action is performed by the elastic member 20, and the remaining 1
A degree of restoration is achieved by the cooperative action of the rectangular frame 34 and the annular locking member 28.

Note that in order to increase the restoring force of the elastic member 20,
Coil springs can also be embedded.

Effects of the invention As described above, the present invention provides smooth restoring action, easy manufacture, and convenient transport and storage, which are the effects of the conventional restoring device.
It has the practical effect of improving the restoring force, allowing the chair seat to return to its original position accurately, and even when the chairs are arranged in a row, they can be restored in an orderly manner, achieving an arrangement that is extremely superior in appearance. It is something to play.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway longitudinal sectional front view, FIG. 2 is an explanatory view showing the relationship between the rectangular frame and the annular locking member, and FIG. 3 is a sectional view taken along the - line in FIG. 1, FIG. 4 is a sectional view taken along the - line in FIG. FIG. 5 is a partially cross-sectional side view of FIG. 5; 2... Support column, 4... Receiving tube, 6... Locking tube, 7...
...Mounting plate, 8...Cylindrical member, 10...Chair seat,
11...Sliding member, 12...Annular groove, 14...Bolt, 16...Stopper, 18...Blind hole, 20
...Elastic member, 24...Engaging portion, 26...Shaft, 2
8... Annular locking member, 34... Square frame, S
...spring means.

Claims (1)

[Scope of utility model registration request] A mounting plate is fixed to the lower surface of the chair seat, a sliding member is installed on the lower surface of the mounting plate in a state where it can slide freely and is biased in a predetermined direction, and a receiver is provided inside the upper end of the support column. A cylindrical member is provided protruding from the lower surface of the sliding member, an annular groove is bored in the upper part of the cylindrical member, a bolt inserted from the outside of the column is inserted into the annular groove, and the receiving tube and the cylindrical member are connected. and an elastic member fitted into the lower part of the receiving cylinder, with one end inserted into a blind hole provided on the lower surface of the cylindrical member and fixed with a shaft, and the engaging part of the other end having a square cross section movable up and down. , an annular locking member having a locking surface formed in a direction coinciding with a predetermined direction of the chair seat and a sliding surface other than the locking surface is provided near the upper end of the support; An elastic square frame made of synthetic resin is attached to the lower surface of the sliding member so as to constantly hold and press the seat, and the chair seat is always positioned in a predetermined direction due to the grip and press force of the square frame. A chair equipped with a restoring device, characterized in that the chair is biased in such a manner that the chair is energized in such a way that