JP2967152B2 - Chair leg - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leg of a chair having a freely rotatable seat.

[0002]

2. Description of the Related Art Generally, for example, chairs for counters and pachinko parlors, which are hanged by an unspecified number of people,
A seat body with a seat and a backrest is rotatably mounted on the upper end of a pillar standing on the floor.

[0003]

However, in the above-mentioned chair, the height of the seat cannot be arbitrarily adjusted to a height according to the user's preference, and the chair main body is attached to the column. On the other hand, since it is freely rotatable, when the user leaves the chair, the seat is often left as it is rotated, so that the seat faces in various directions and the beauty of the store is spoiled. Things.

The present invention has been developed in view of the above circumstances, and has as its object to adjust the height of a seat body and to automatically return a rotated seat body to its original position. The aim is to make the body more compact.

[0005]

In order to achieve the above object, the invention according to claim 1 comprises an outer cylinder erected on a base member and a lower end inserted through the outer cylinder so as to be able to move back and forth. An inner cylinder having a flat cylindrical portion provided with opposing walls whose portions are opposed to each other, and a support rod whose one end is rotatably inserted into and supported by the inner cylinder, and the other end of which is attached to a seat body. An engagement base having a plurality of engagement portions inserted into the flat tube portion, and an engagement base provided in the flat tube portion, between the outer tube and the inner tube in the tube, wherein the inner tube is the outer tube. And a locking member that engages with the engaging portion only in a direction in which the inner cylinder is housed in the inner cylinder so as to adjust a protruding length of the inner cylinder with respect to the outer cylinder. A first end between the inner cylinder and the support rod in the cylinder, the lower end of the support rod being rotatably supported and having a cam surface at an upper end; A second piece having an inclined surface overlapping with the cam surface, and biasing the second piece toward the first piece. And a coil spring loosely inserted into the support rod, the first piece has a projection at the lower end portion that fits into the flat tube portion, and the projection fits into the flat tube portion, There is provided a return mechanism in which the first piece is non-rotatably assembled to the inner cylinder.

[0006]

According to the first aspect of the present invention,
A length adjustment mechanism is provided between the outer cylinder and the inner cylinder disposed coaxially, and a return mechanism is provided between the inner cylinder and the support rod similarly disposed coaxially, The first piece, which forms a part of the return mechanism, is not rotatable in the flat cylinder part by the projection provided at the lower end of the first piece on the flat cylinder part, which forms a part of the length adjustment mechanism. Because of the assembly, the legs can be made compact and the appearance can be improved despite the incorporation of both of these mechanisms. However, the height of the seat body is improved by the length adjustment mechanism and the return mechanism. The adjusted and rotated seat can be automatically returned to the original position.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
A cylindrical outer cylinder 1 erected on a plate-shaped base member 10, an inner cylinder 2 inserted through the outer cylinder 1 so as to be able to move back and forth, and a lower end portion rotatably inserted into and supported by the inner cylinder 2. A support rod 4 to which a chair seat 3a is attached is provided at an upper end portion, and the base member 10 is fixed to a base 3b mounted on a floor, while an upper end portion of the support rod 4 has The seat 3a
Is reciprocated in the front-rear direction.

The inner tube 2 inserted into the outer tube 1 has a cylindrical portion 2a at the upper end and a flat cylindrical portion 2b having opposing walls 21 at the lower end. The inner cylinder 2 is slidably supported in the retreating direction with respect to the outer cylinder 1 via a spacer 11 bolted to the upper end opening of the outer cylinder 1 and a spacer 12 bolted to the outer cylinder 1. Further, a length adjusting mechanism 6 for adjusting the length of the inner cylinder 2 protruding from the outer cylinder 1 is provided between the outer cylinder 1 and the inner cylinder 2 in the outer cylinder 1.

The length adjusting mechanism 6 basically includes a pair of guide holes 61 formed in the opposed wall 21 of the flat cylindrical portion 2b.
A locking body 62 to be bridged therebetween, an engagement base 63 fixed to the outer cylinder 1, a plurality of engagement portions 64 formed on the engagement base 63, and the locking body 62 And a spring 65 for urging in a direction in which the length adjusting mechanism is engaged. Next, the length adjusting mechanism will be described in detail.

The guide hole 61 formed in the inner cylinder 2
Is a first guide portion 61a extending in the longitudinal direction of the inner cylinder 2, that is, the sliding direction of the inner cylinder 2 (vertical direction in FIG. 1).
And a second guide portion 61b extending from the upper end of the first guide portion 61a in the lateral direction of the inner cylinder 2, that is, in the direction orthogonal to the sliding direction of the inner cylinder 2, and has an L-shape. Are formed at the lower end portions of both opposed side walls 21 of the flat cylindrical portion 2b so as to be opposed to each other. 62, the first and second guide portions 61a and 61
It is free to move along 1b.

The engaging base 63 fixed to the outer cylinder 1 is made of a strip-shaped metal plate, and the lower end of the engaging base 63 is fixed to a support plate 66 fixed to the lower end in the outer cylinder 1. The engaging base 63 is provided upright in the flat tubular portion 2b.

A long hole 67 extending in the sliding direction of the inner cylinder 2 is formed in the engagement base 63, and
Engaging portions 64 formed of a plurality of fitting grooves communicating with the outer cylinder 7 are formed at predetermined intervals along the length direction of the outer cylinder 1.

On the upper inner edge of the engaging portion 64, an inclined surface 64a inclined obliquely upward toward the elongated hole 67 is provided.
When the inner cylinder 2 is extended with respect to the outer cylinder 1,
The locking body 62 is disengaged from the engaging portion 64 by the guide of the inclined surface 64a and is moved into the long hole 67. The inclined surface 64a of the engaging portion 64 located is extended toward the long hole 67, and the inclined surface 64a is
And a cam surface 64b continuous with the second guide portion 61b.
While being guided to the guide portion 61a, the slot 6
A receiving surface 68 extending in a direction perpendicular to the sliding direction of the inner cylinder 2 is formed on a lower edge of the inner cylinder 7, and the receiving surface 68 is formed so as to receive the locking body 62. The cylinder 2 is formed on a smooth surface that is continuous with the lower inner edge of the engaging portion 64 located at the forefront in the retreating direction with respect to the outer cylinder 1.

A coil spring 65 is provided between both ends of the locking member 62 in the longitudinal direction and the flat cylindrical portion 2b, and the locking member 62 is moved by the spring force of the spring 65. 64 is urged in a direction (rightward in FIG. 2) to be engaged.

In the embodiment shown in the drawings, a screw 13 is screwed into the lower part of the outer cylinder 1 and a plurality of screw holes 22 are formed in the flat cylindrical part 2 b of the inner cylinder 2 at the same pitch as the engaging part 64. It is formed at intervals, and by screwing the screw body 13 into the screw hole 22, the inner cylinder 2, whose protrusion length is arbitrarily adjusted via the length adjustment mechanism 6, can be locked to the outer cylinder 1. I have to.

On the other hand, between the inner cylinder 2 and the support rod 4 in the inner cylinder 2, after the rotation operation of the support rod 4 with respect to the inner cylinder 2, the rotated support rod 4 is rotated. A return mechanism 7 for automatically returning to the original position.

That is, the double-acting mechanism 7 shown in FIG.
A first piece 71 rotatably supports the lower end of the support rod 4, a cylindrical second piece 72 slidably inserted in the lower end of the support rod 4 only in the axial direction, and a play on the support rod 4. The first piece 7 includes a flange 41 that is inserted and protruded from a middle portion in the longitudinal direction of the support rod 4 and a coil spring 73 interposed between an upper end surface of the second piece 72.
A flat projection 74 that fits into the flat cylindrical portion 2b protrudes from the lower end of the flat tube portion 2 and the first piece 71 is connected to the cylindrical shape by fitting the projection 74 into the flat cylindrical portion 2b. The lower end of the support rod 4 is rotatably inserted into a support hole 75 formed in the piece 71 while the lower end of the support rod 4 is rotatably fitted to the inner bottom of the portion 2a. A pair of left and right cam surfaces 76 are formed to incline obliquely upward over a half circumference in the direction.

The lower end surface of the second piece 72
A pair of left and right inclined surfaces 77 are formed on each of the cam surfaces 76 so that the second piece 72 that rotates together with the support rod 4 is rotated by the rotation of the support rod 4.
The coil spring 73 is compressed by the second piece 72 by being slid upward with respect to the support rod 4 via a cam surface 76 overlapping the coil spring 73.
In addition, a spring reaction force for pressing the second piece 72 downward is generated.

The slide mechanism 5 includes the support rod 4.
A lower member 5a having an inverted hat-shaped cross section fixed to the upper end of
The lower member 5a is slidably supported in the front-rear direction and is fixed to the seat body 3a. The upper member 5b has an inverted hat shape in cross section.

More specifically, the lower member 5a is connected to a bottom wall 52 having a fitting hole 51 into which the upper end of the support rod 4 is fitted.
And a pair of side walls 5 bent upward from both ends of the bottom wall 52.
3 and a pair of flanges 54 bent in the horizontal direction from the upper end of the side wall 53, and a resin spacer 55 is attached to the flange 54, while the lower surface of the upper member 5b is formed along the spacer 55. And a guide 56 having a U-shaped cross section that can be moved by
5, the upper member 5b is freely slidably supported in the front-rear direction with respect to the lower member 5a. Further, between the front side of the lower member 5a and the rear side of the upper member 5b. The upper member 5 which is moved backward with respect to the lower member 5a by hanging the return spring 57
b is caused to return forward by a spring reaction force generated in the return spring 57.

Reference numeral 23 denotes a ring-shaped washer interposed in the upper end opening of the inner cylinder 2, and 24 denotes a thrust bearing interposed between the washer 23 and the flange 41 of the support rod 4. ,
Reference numeral 25 denotes a base fixed to the upper end opening of the inner cylinder 2.

Next, the operation of the chair using the legs configured as described above will be described.

FIGS. 1 and 2 show the upper body in which the inner cylinder 2 is retracted with respect to the outer cylinder 1 and the seat 3a is lower than the base 3b. In order to raise the seat body 3a from above, the seat body 3a is lifted upward and the inner cylinder 2 is projected from the outer cylinder 1 (FIG. 1).
In this case, the engagement body 62 is guided by the inclined surface 64a and the second guide portion 61b is guided from the second guide portion 61b by the guide of the inclined surface 64a. 1 guide portion 61a side,
That is, it moves while digging into the spring 65 in a direction to be separated from the engaging portion 64 and sequentially fits into the engaging portion 64 located in the front in the pulling-out direction. On the other hand, the seat 3a
In order to lower the height, first, the inner cylinder 2 is pulled out largely with respect to the outer cylinder 1, and the locking body 62 is moved from the second guide portion 61b to the first guide portion 61 by the cam surface 64b.
a, and the inner cylinder 2 is further pulled out while the inner cylinder 2 is being pulled out.
2 to move upward, and the locking body 62 fits into the lower end of the first guide portion 61a, and the engaging portion 64
Is held at a position where the long hole 67 is not formed.

Accordingly, thereafter, the inner cylinder 2 can slide in the direction of retreating into the outer cylinder 1 (downward in FIG. 1).

Then, when the inner cylinder 2 is slid in the retreating direction with respect to the outer cylinder 1, the inner cylinder 2
The locking body 62 is received by the receiving surface 68 at a position where it is almost housed in the inner cylinder 2. When the inner cylinder 2 is further slid from this state, the inner cylinder 2 moves downward while leaving the locking body 62. The lock body 62 moves to the upper end of the first guide portion 61a. Thus, the locking body 62 is moved by the spring force of the spring 65 to the second guide portion 61.
The inner cylinder 2 moves to the side b, and is fitted to the engagement portion 64 located at the forefront in the retreating direction of the inner cylinder 2 with respect to the outer cylinder 1.

Therefore, if the inner cylinder 2 is slid again in the direction in which it protrudes with respect to the outer cylinder 1, the engaging portions 64 into which the locking members 62 are fitted are sequentially changed, and the seat 3a is moved to a desired position. The height can be adjusted.

On the other hand, when the seat body 3a is rotated clockwise or counterclockwise with respect to the base body 3b, the seat body 3a
3, the support rod 4 supporting the seat body 3a rotates with the second piece 72 with respect to the inner cylinder 2 as shown in FIG. 7
2 slides upward through the cam surface 76 of the first piece 71, and the coil spring 73 is compressed.

Therefore, when the rotation of the seat 3a is stopped and the seat 3a is released, the second piece 7 is released by the spring reaction force of the coil spring 73 compressed.
2 is pressed downward, the second piece 72 slides downward with respect to the support rod 4 while rotating in reverse with the support rod 4 under the guidance of the cam surface 76, and the seat 3a is rotated. It returns to the previous original position.

When the seat 3a is slid rearward and separated from the seat 3a, the seat 3a is moved forward by the spring reaction force of the return spring 57 of the slide mechanism 5.

Thus, in the above leg, the outer cylinder 1, the inner cylinder 2, and the support rod 4 are coaxially arranged, and the outer cylinder 1 and the inner cylinder are arranged on the bottom side of the outer cylinder 1. A length adjusting mechanism 6 is provided between the inner cylinder 2 and the support rod 4 on the upper side of the inner cylinder 2, and a return mechanism 7 is provided between the inner rod 2 and the support rod 4. The first piece 71 constituting a part of the flat cylinder part 2b constituting a part of the length adjustment mechanism 6 is formed on the flat cylinder part 2b by a projection 74 projecting from the lower end of the first piece 71. In other words, since the length adjustment mechanism 6 and the return mechanism 7 are rationally disposed above and below the inner cylinder 2, both the mechanisms 6 and 7, the shape of the leg A can be made compact and the appearance is good, and the seat 3a It is able to be automatically backward the seat support 3a is rotated with height adjustment to the original position.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a leg according to the present invention as viewed from the front.

FIG. 2 is a longitudinal sectional view of the leg according to the present invention as viewed from the side.

FIG. 3 is a side view of the leg according to the present invention with a part cut away.

FIG. 4 is an enlarged sectional view taken along line XX in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer cylinder 10 Base member 2 Inner cylinder 3a Seat 4 Supporting rod 6 Length adjustment mechanism 62 Locking body 63 Lock body 64 Engaging part 7 Return mechanism

Claims (1)

(57) [Claims] 1. A base - and scan member erected on the outer cylinder, are projecting and retracting freely inserted into the outer cylinder <br/>, opposed walls and opposite the lower end Bei
And inner cylinder was Erareru flat tubular portion, one end side is freely inserted and supported rotating in the inner cylinder, supporting the other end portion that is assembled to the seat support
And a rod, between the inner tube and the outer cylinder in said outer cylinder, said
An engagement base having a plurality of engagement portions inserted into the flat cylindrical portion ,
Provided in the flat tube portion and the inner cylinder are engaged with the engagement portion only in the direction in which is housed in said outer tube, prior to the inner tube
While providing a length adjustment Organization that includes a locking member that can be adjusted to the projecting length for serial outer cylinder, between the support rod and inner cylinder within said inner cylinder, the front
The lower end of the support rod is rotatably supported, and the upper end has a cam surface.
A first piece having an axial direction at a lower end of the support rod.
Slope freely inserted and overlaps with the cam surface
A second piece having a first piece and the second piece
Coil that is loosely inserted into the support rod to urge it toward
And the first piece has a flat end at a lower end thereof.
A projection fitted in the flat tube portion, and the flat tube portion of the projection
The first piece cannot rotate with respect to the inner cylinder due to the fitting inside.
Chair leg, wherein the kick set the reciprocating motion mechanisms assembled to capacity.