JPH09299175A - Leg body for chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact leg body for a chair which can adjust the height of the seat of the hair and automatically returns the rotated seat to the original position. SOLUTION: This leg body for a chair has an outer cylinder 1, an inner cylinder 2 which can be freely inserted into or pulled out of the outer cylinder 1, and a support rod 4. One end of the support rod 4 inserted into the inner cylinder 2 and supported rotatably, and the seat part 3a of the chair mounted on the other end of the support rod 4. A length adjustment mechanism 6 with a lock unit and an engagement unit 62 is installed between the outer cylinder 1 and the inner cylinder 2 inside the outer cylinder 1. The lock unit has plural number of engagement parts 64 on the side of the outer cylinder 1. The engagement unit 62 is installed on the side of the inner cylinder 2, and can adjust the protruding length of the inner cylinder 2 from the outer cylinder 1 by engaging with the engagement parts 64 only in the direction of inserting the inner cylinder 2 into the outer cylinder 1. A return mechanism 7 is installed between the inner cylinder 2 and the support rod 4 inside the inner cylinder 2. By this return mechanism 7, the support rid 4, after being rotated against the inner cylinder 2, is automatically returned to its original position as against the inner cylinder 2.

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 whose seat is rotatable.

[0002]

2. Description of the Related Art Generally, for example, a counter chair or a customer chair of a pachinko parlor, which is hung by an unspecified number of people,
A seat body having a seat portion and a backrest portion is rotatably attached to the upper end of a pillar standing on the floor.

[0003]

In the above-mentioned chair, however, the height of the seat cannot be arbitrarily adjusted to the height according to the preference of the user, and the chair 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 in a rotated state, which causes the seat to face various directions and spoil the aesthetics of the store. It is a thing.

The present invention has been developed in view of the above circumstances, and a purpose thereof is a leg capable of adjusting the height of the seat body and automatically returning the seat body to the original position. The point is to make the body compact.

[0005]

In order to achieve the above object, the invention according to claim 1 is to provide an outer cylinder 1 erected on a base member 10 and an inner cylinder that is inserted into and retractable from the outer cylinder 1. 2 and
Between the outer cylinder 1 and the inner cylinder 2 in the outer cylinder 1, there is provided a support rod 4 having one end side rotatably inserted into and supported by the inner cylinder 2 and the other end portion to which the seat body 3a is assembled. Includes a lock body 63 having a plurality of engaging portions 64 provided on the outer cylinder 1 side, and the engagement body provided on the inner cylinder 2 side only in the direction in which the inner cylinder 2 is housed in the outer cylinder 1. A length adjusting mechanism 6 including a locking body 62 that engages with the joint portion 64 to adjust the protruding length of the inner cylinder 2 with respect to the outer cylinder 1 is provided. Between the inner cylinder 2 and the support rod 4, after the rotation operation of the support rod 4 with respect to the inner cylinder 2, the support rod 4 that has been rotated is automatically returned to the original position with respect to the inner cylinder 2. The moving mechanism 7 is provided.

[0006]

According to the first aspect of the present invention,
A length adjusting mechanism 6 is provided between the outer cylinder 1 and the inner cylinder 2 which are coaxially arranged, and a return mechanism 7 is provided between the inner cylinder 2 and the support rod 4 which are also coaxially arranged. Since they are provided respectively, the legs can be made compact and the appearance is good despite incorporating both of these mechanisms 6 and 7, and yet,
By the length adjusting mechanism 6 and the returning mechanism 7, the height of the seat body 3a can be adjusted and the seat body 3a rotated can be automatically returned to the original position.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION
A cylindrical outer cylinder 1 erected on a plate-shaped base member 10, an inner cylinder 2 which is inserted into and retracted from the outer cylinder 1, and a lower end portion of which is rotatably inserted and supported in the inner cylinder 2. A support rod 4 adapted to assemble a seat 3a of a chair is provided at an upper end portion, and the base member 10 is fixed to a base body 3b placed on a floor, while an upper end portion of the support rod 4 is The seat 3a
A slide mechanism 5 that reciprocates in the front-back direction is assembled.

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

The length adjusting mechanism 6 basically has a pair of guide holes 61 formed in the opposing wall 21 of the flat tubular portion 2b.
A locking body 62 to be hung between them, a lock body 63 fixed to the outer cylinder 1, and a plurality of engaging portions 6 formed on the lock body 63.
4 and a spring 65 for urging the locking body 62 in a direction to engage with the engaging portion 64. 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 vertical direction of the inner cylinder 2, that is, in 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 in opposed relation to the lower end portions of the opposite side walls 21 of the flat tubular portion 2b, and a columnar locking body 62 is hung between the guide holes 61 to form the locking body. 62 to the first and second guide portions 61a, 6
It is free to move along 1b.

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

A long hole 67 extending in the sliding direction of the inner cylinder 2 is formed in the lock body 63, and the long hole 6 is formed.
Engaging portions 64 formed of a plurality of fitting grooves communicating with 7 are formed at predetermined intervals along the length direction of the outer cylinder 1.

At the inner edge of the upper side of the engaging portion 64, an inclined surface 64a inclined obliquely upward toward the elongated hole 67.
And when the inner cylinder 2 extends with respect to the outer cylinder 1,
The locking body 62 is disengaged from the engaging portion 64 and moved into the elongated hole 67 by the guide of the inclined surface 64a, while the inner cylinder 2 is located at the frontmost position in the extension direction with respect to the outer cylinder 1. The inclined surface 64a of the engaging portion 64 located is extended to the long hole 67 side, and the inclined surface 64a is extended to the long hole 67 side.
A cam surface 64b continuous with the first guide portion 61b from the first guide portion 61b.
The long hole 6 is formed so as to be guided to the guide portion 61a.
A receiving surface 68 extending in a direction orthogonal to the sliding direction of the inner cylinder 2 is formed at the lower edge of the inner cylinder 2, and the receiving surface 68 is formed so as to receive the locking body 62. It is formed as a smooth surface which is continuous with the lower inner edge of the engaging portion 64 which is located at the forefront in the retreating direction of the outer cylinder 1 of the outer cylinder 1.

A coil spring 69 is stretched between both ends of the locking body 62 in the lengthwise direction and the flat cylindrical portion 2b, and the spring force of the spring 69 causes the locking body 62 to engage with the engaging portion. It is urged in the direction of engaging with 64 (to the right in FIG. 2).

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

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

That is, the double-acting mechanism 7 shown in FIG.
A first piece 71 that rotatably supports the lower end portion of the support rod 4, a cylindrical second piece 72 that is slidably inserted only in the axial direction into the lower end portion of the support rod 4, and a support rod 4 The first piece 7 is composed of a coil spring 73 that is inserted between the collar portion 41 protruding from the middle portion of the support rod 4 in the longitudinal direction and the upper end surface of the second piece 72.
At the lower end of 1, a flat protrusion 74 that fits into the flat tubular portion 2b is provided in a protruding manner, and by fitting the projection 74 into the flat tubular portion 2b, the first piece 71 is inserted into the cylinder. The lower end of the support rod 4 is rotatably fitted into the support hole 75 formed in the piece 71 while the lower end of the support rod 4 is rotatably attached to the inner bottom of the part 2a. A pair of left and right cam surfaces 76 are formed so as to incline obliquely upward over a half circumference of the direction.

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

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

Specifically, a bottom wall 52 having a fitting hole 51 into which the lower member 5a is fitted at the upper end of the support rod 4.
And a pair of side walls 5 bent upward from both ends of the bottom wall 52.
3 and a pair of flanges 54 that are bent from the upper end of the side wall 53 in the horizontal direction, and a spacer 55 made of resin is attached to the flange 54, while the lower surface of the upper member 5b is provided along the spacer 55. And a movable guide 56 having a U-shaped cross section is provided.
The upper member 5b is slidably supported in the front-rear direction with respect to the lower member 5a by being fitted in 5, and 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 by moving the return spring 57 around the lower member 5a.
b is returned to the front by the spring reaction force generated in the return spring 57.

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

Next, the operation of the chair using the leg having the above structure will be described.

FIGS. 1 and 2 show a state in which the inner cylinder 2 is retracted with respect to the outer cylinder 1 and the seat body 3a is lowered to the lowest with respect to the base body 3b. In order to raise the seat body 3a, the seat body 3a is lifted up to project the inner cylinder 2 from the outer cylinder 1 (see FIG. 1).
It is only necessary to pull out a predetermined stroke in the above direction), and with the pulling out of the inner cylinder 2, the locking body 62 is guided from the second guide portion 61b in the guide hole 61 by the guide of the inclined surface 64a. The first guide portion 61a side,
That is, it moves in the direction of separating from the engaging portion 64 while resisting the spring 65, and is sequentially fitted to the engaging portion 64 located forward in the pulling-out direction. On the other hand, seat 3a
When lowering the height, first, the inner cylinder 2 is largely pulled out from 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.
The inner cylinder 2 is further pulled out while being guided to the upper end portion of a.
2 is moved upwards, the locking body 62 is fitted to the lower end portion of the first guide portion 61b, and the engaging portion 64 is moved.
It is held at a position where it does not fit, that is, at the position where the long hole 67 is formed.

Therefore, thereafter, the inner cylinder 2 can be slid in the direction of retracting into the outer cylinder 1 (downward in FIG. 1).

Then, when the inner cylinder 2 is slid in the direction of retracting from the outer cylinder 1, the inner cylinder 2 is moved to the outer cylinder 1.
The locking body 62 is received by the receiving surface 68 at a position where it is substantially housed therein, and when the inner cylinder 2 is further slid from such a state, the inner cylinder 2 leaves the locking body 62 and moves downward. By moving, the locking body 62 comes to the upper end portion of the first guide portion 61a. Thus, the locking body 62 is locked by the spring force of the spring 69 to move the first guide portion 61.
It moves to the side a and fits into the engaging portion 64 located at the forefront in the retreating direction of the inner cylinder 2 with respect to the outer cylinder 1.

Therefore, when the inner cylinder 2 is slid again in the protruding direction with respect to the outer cylinder 1, the engaging portion 64 into which the locking body 62 is fitted is sequentially changed, and the seat body 3a is desired. It can be adjusted to the height of.

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

Therefore, when the rotating operation of the seat body 3a is stopped and the seat body 3a is freed, the second reaction piece 72 is pressed downward by the spring reaction force of the compressed coil spring. Since the second piece 72 slides downward with respect to the support rod 4 while reversing together with the support rod 4 by the guide of the cam surface 76, the seat body 3a returns to the original position before the rotation operation. is there.

When the seat body 3a is slid backward and separated from the seat body 3a, the seat body 3a is returned to the front by the spring reaction force of the return spring 57 of the slide mechanism 5.

Thus, in the above-mentioned leg, the outer cylinder 1, the inner cylinder 2 and the support rod 4 are coaxially arranged, and the inner cylinder 1 and the inner cylinder 1 on the bottom side of the outer cylinder 1 are arranged. In other words, a length adjusting mechanism 6 is provided between the inner cylinder 2 and the cylinder 2, and a return mechanism 7 is provided between the inner cylinder 2 and the support rod 4 on the upper side of the inner cylinder 2. Since the length adjusting mechanism 6 and the returning mechanism 7 are rationally arranged above and below the inner cylinder 2,
Despite incorporating both of these mechanisms 6 and 7, the outer shape of the leg A can be made compact and the appearance is good, and yet the height of the seat 3a is adjusted and the seat 3a is rotated. Can be automatically moved back to the original position.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a leg body according to the present invention seen from the front.

FIG. 2 is a vertical cross-sectional view of a leg body according to the present invention seen from a side surface.

FIG. 3 is a side view showing a notched part of a leg body according to the present invention.

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

[Explanation of symbols]

 1 Outer Cylinder 10 Base Member 2 Inner Cylinder 3a Seat 4 Support Rod 6 Length Adjusting Mechanism 62 Locking Body 63 Locking Body 64 Engaging Part 7 Returning Mechanism

Claims (1)

[Claims] 1. An outer cylinder (1) erected on a base member (10), an inner cylinder (2) which is inserted into and retractable from the outer cylinder (1), and one end side of which is the inner cylinder (2). A support rod (4) which is rotatably inserted into and supported by the seat and is attached to the other end of the seat body (3a).
And a lock having a plurality of engaging portions (64) provided on the outer cylinder (1) side between the outer cylinder (1) and the inner cylinder (2) in the outer cylinder (1). The body (63) and the inner cylinder (2) side are provided, and the inner cylinder (2) is engaged with the engagement portion (64) only in a direction to be housed in the outer cylinder (1), A length adjusting mechanism (6) having a locking body (62) capable of adjusting the protruding length of the inner cylinder (2) with respect to the outer cylinder (1) is provided, while inside the inner cylinder (2). Between the inner cylinder (2) and the support rod (4), after rotating the inner cylinder (2) of the support rod (4), the rotated support rod (4) is inserted into the inner cylinder (2). A leg for a chair, which is provided with a returning mechanism (7) for automatically returning to the original position.