WO1999062378A1

WO1999062378A1 - Chair and its rotating table

Info

Publication number: WO1999062378A1
Application number: PCT/JP1999/002929
Authority: WO
Inventors: Yoshinobu Yamashita
Original assignee: Yoshinobu Yamashita
Priority date: 1998-06-01
Filing date: 1999-06-01
Publication date: 1999-12-09
Also published as: JP2000050996A; EP1000569A1; CN1256622A; EP1000569A4

Abstract

A chair and its rotating table, wherein a leg body and a seat body of the chair are rotatably supported relatively to each other by a rotating table installed between them, the rotating table comprising a leg body side member and a seat body side member rotated relatively to each other and a connecting member installed between them, the leg body side member being provided with a plurality of engaging parts in the direction of rotation of the seat body side member at specified intervals, and the seat body side member being provided swingably with a control lever having a locking part capable of locking to and unlocking from the engaging part, whereby it is possible to sit on the rotation-locked seat body which can be rotated by simply operating the control lever.

Description

Specification

Chairs and turntables for chairs

The present invention relates to a chair whose seat can be rotated with respect to a leg and a turntable used for the chair. Background art

The chair is provided with a rotatable seat on a leg with rolling wheels, and a mobile type that is mainly used for office work, and a seat with a leg that does not have rolling wheels. The stationary type, which is mainly used for dining tables, and the rotary type, which is mainly used for learning because the seat is rotatably provided on a leg that does not have rolling wheels, are generally known. I have.

The movable type is easy to move the whole chair, and the rotating type is easy to rotate the seat, so there are many opportunities to move the body. Office chair is convenient for learning, but it is good for dining table As a chair, the body is not stable, and there is a problem in that it is not possible to eat with a calm feeling. Therefore, stationary chairs are generally used as dining chairs. When sitting on this stationary type chair and eating, the knees will enter the lower area of the table, so when sitting, sit down at the back of the table and place the chair on the table. It is necessary to move closer to the table, and when leaving after finishing a meal, it is necessary to lower the table backward. For this reason, especially when a physically handicapped person uses a stationary chair, it is difficult to perform sitting and leaving operations. The present invention has been made to solve the above-described problems. An object of the present invention is to provide a rotary table for rotating a seat, and one of a leg-side member or a seat-side member in the rotary table. By providing an engaging part on the other side and an operating lever on the other side that can be locked / removed from the engaging part, it is possible to sit on a seat body that is prevented from rotating, and operate the operating lever. It is an object of the present invention to provide a chair and a turntable for the chair, which enable the rotation of the seat by a simple operation.

Another object of the present invention is to provide a pair of grips disposed on both sides of the seat at the other end of the operation lever, so that even if one of the left hand or the right hand is inconvenient, An object of the present invention is to provide a chair and a turntable for a chair that can rotate a seat body in a natural posture while sitting.o Disclosure of the invention

The chair according to the first invention is a chair comprising: a seat on which a seated person sits; a leg supporting the seat; and a turntable for connecting the seat and the leg in a relative rotation. A first member (leg-side member or seat-side member) attached to one of the leg and the seat, and a second member (leg-side member or seat-side member) to the other. A connecting member interposed between the members and connecting the members so as to be rotatable relative to each other; a plurality of engaging portions provided on the first member so as to be spaced apart from each other along a direction of relative rotation; The two members are provided with an operation lever for locking the engaging portion when the member is operated, and the first and second members are provided when the operating lever locks the engaging portion. The feature is that it is made to restrain the relative rotation of.

The turntable for a chair according to the ninth invention is provided on either the leg or the seat. A first member (leg side member or seat side member) to be attached, a second member (leg side member or seat side member) to be attached to the other member, and a connecting member interposed between these members. A plurality of engagement portions are provided on the first member so as to be spaced apart from each other in the direction of relative rotation; and an operation lever is provided on the second member to lock the engagement portion by being operated. It is characterized in that the operating lever locks the engaging portion to restrain the relative rotation of the first and second members.

In the first invention and the ninth invention, the relative rotation of the first and second members, that is, the relative rotation of the leg and the seat body (generally, Since the legs are fixed, the rotation of the seat can be prevented, and by operating the operation lever, the locking of the operation lever to the engaging portion is released. Since the body can be rotated, even when the handicapped is using it, the seat can be rotated to the required angle with a simple operation of moving one hand and operating the operating lever. It is possible to leave the seat and reduce the burden on the user. In addition, when the seat is seated, the rotation of the seat body can be reliably prevented, and a meal or the like can be performed in a calm mood.

The chair according to the second invention and the turntable for a chair according to the tenth invention are characterized in that the operating lever is provided at one end of the chair, and has a locking portion for locking the engaging portion. It is characterized by being pivotally supported by the second member so as to be swingable about a shaft (lever shaft) provided along the relative rotation direction.

In the second invention and the tenth invention, a simple operation of simply pushing the swingable operation lever downward or pulling the operation lever upward is performed. The rotation of the seat can be allowed or restricted (or vice versa), and the force for operating the operation lever can be reduced, so that the burden on the user can be further reduced. .

In the chair according to the third invention and the rotating table for a chair according to the eleventh invention, the operation lever is provided at one end thereof, and a locking portion for locking the engagement portion is provided at the other end. And a holding portion disposed on both sides of the second member.

In the third invention and the eleventh invention, since the operation lever can be operated on both sides of the second member, in particular, by configuring the second member to be attached to the seat body side (rotation side), Even if one of the left hand or right hand is inconvenient, the seat can be easily rotated in a natural posture while sitting. In the case where the second member is attached to the leg side (fixed side), the gripper comes to a position separated from both left and right sides with the rotation of the seat body. By configuring, there is no interference with the user during rotation. In this case, for example, by configuring the gripping part to be located in the front-back direction when leaving, it is possible to operate the gripping part on the front side with either the left hand or the right hand. The operation lever can be easily and easily operated in a crouched position.

The chair according to the fourth invention and the turntable for a chair according to the 12th invention are characterized in that the operation lever is provided with a pair of the other end portions branching off from an intermediate portion in the longitudinal direction.

In the fourth invention and the twelve invention, since the operation lever has a pair of other ends branched from the middle part in the longitudinal direction, the operation lever is simpler than a structure using two operation levers. Cost can be reduced. The chair according to the fifth invention and the turntable for a chair according to the thirteenth invention are characterized in that: The operation lever is constituted by one end side member provided with the locking portion, and the other end side member provided with the grip portion, and the other end side member is operated by operating the grip portion. It is characterized by comprising a pressing portion that presses the one end member and moves the locking portion in a direction in which the locking portion is separated from the engaging portion.

In the fifth invention and the thirteenth invention, even when the types of chairs are different or the size is different for the same type, the other end side member is replaced without replacing the entire operation lever. By doing so, the grip portion of the operation lever can be arranged at a position suitable for the chair, and the cost of the operation lever and, consequently, the overall cost can be reduced.

The chair according to the sixth invention and the chair turntable according to the fourteenth invention, wherein the first member is made of a metal plate, and protrudes in the vicinity of the periphery to the side opposite to the side of the second member. It is characterized by being provided with a plurality of mounting seats which are formed, and whose mounting portion has a mounting hole to the leg body.

In the sixth invention and the fourteenth invention, the mounting seat, the mounting hole, and the engagement portion of the first member can be easily formed by molding and can be provided at a low cost. By providing the mounting seat so as to protrude to the side, the movement area of the locking portion can be made large near the top and bottom of this mounting seat, and the engagement between the locking portion and the engaging portion can be increased. Since the joint area can be lengthened, it is possible to satisfactorily prevent the seat body from being rotated inadvertently when the operation lever is not operated by a required operation amount. It can be attached without being disturbed by the member.

In the chair according to the seventh aspect and the turntable for a chair according to the fifteenth aspect, the engaging portion is provided by a notch between the mounting seats on a peripheral edge of the first member, and the locking portion has a protrusion. It is characterized by being.

In the seventh invention and the fifteenth invention, the notch is formed in the engagement portion. On the other hand, the locking portion can be provided at a low cost because the protrusion can be provided on the operation lever by using a joining method such as welding.

The chair according to an eighth aspect of the present invention is characterized in that the turntable includes a spring that biases the operation lever in a direction in which the engagement portion is locked. The turntable for a chair according to a sixteenth aspect of the present invention is further characterized by further comprising a spring for urging the operation lever in a direction for locking the engaging portion. In the eighth invention and the sixteenth invention, since the operation lever is biased in the direction for locking the engagement portion, it is possible to prevent the seat body from rotating carelessly, and After the pushing or pulling operation of the operating lever to allow or prevent the rotation of the seat body, the operating lever may be returned to the state before the operation by releasing the user's hand. it can. BRIEF DESCRIPTION OF THE FIGURES

Fig. 1 is an enlarged longitudinal sectional front view of a main part showing a first embodiment of a chair according to the present invention. Fig. 2 is a bottom view showing a first embodiment of a chair turntable according to the present invention. FIG. 4 is a plan view showing a rotary table for a chair according to the first embodiment of the present invention, FIG. 4 is a front view showing a rotary table for a chair according to the first embodiment of the present invention, and FIG. FIG. 6 is an enlarged cross-sectional view of the X-ray, FIG. 6 is a perspective view showing Embodiment 1 of the chair according to the present invention, and FIG. 7 is an enlarged vertical sectional front view of a main part showing Embodiment 2 of the chair according to the present invention. FIG. 8 is a bottom view showing a second embodiment of the swivel base for a chair according to the present invention, FIG. 9 is a perspective view showing a third embodiment of the chair according to the present invention, and FIG. FIG. 11 is a plan view showing a third embodiment of the chair turntable, FIG. 11 is an enlarged vertical sectional front view of a main part showing a third embodiment of the chair according to the present invention, and FIG. Pertain FIG. 13 is a front view showing a third embodiment of a rotating table for chairs, and FIG. FIG. 14 is a bottom view showing Embodiment 4 of the chair turntable according to the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments.

(Embodiment 1)

Fig. 1 is an enlarged longitudinal sectional front view of a main part showing a first embodiment of a chair according to the present invention, Fig. 2 is a bottom view of only a turntable, Fig. 3 is a plan view of only a turntable, and Fig. 4 is FIG. 5 is a front view of only the turntable, FIG. 5 is an enlarged sectional view taken along line X-X of FIG. 3, and FIG. 6 is a perspective view of the entire chair.

The chair has four legs 11 1, 11 1,... Arranged at four corners in a plan view, and a leg 1 having a square connecting portion 12 connecting the upper ends thereof. A seat 2 having a quadrangular seat portion 21 facing the portion 1 2 and a backrest portion 22 extending upward from one side thereof in a plan view, and being interposed between the leg 1 and the seat body 2 And a turntable 3 for rotatably supporting the seat 2 on the leg 1.

The turntable 3 includes a leg-side member 31 and a seat-side member 32, each of which has a substantially rectangular shape in plan view and made of a metal plate, and a plurality of sliding members 33 interposed therebetween. The leg-side member 31 and the seat-side member 32 have through holes 3 la and 32 a at the center, and annular recesses 3 lb and 32 b at the peripheral edge and the middle. The rotation of the seat-side member 32 is enhanced by interposing the sliding member 33 using a rolling element such as a ball between the annular concave portions 31b and 32b.

In the through holes 31a and 32a, a shaft 34 having a flange at one end is passed through from the side of the seat-side member 32, and a seat plate 35 and a rolling element retainer 36 at the other end. Support between the seat plate 35 and the rolling element holder 36. By caulking the other end of the shaft body 34 with a plurality of rolling elements 37 interposed therebetween, the leg side member 31 and the seat body side member 32 are connected, and

The rotation of the seat-side member 32 is prevented from lowering due to 34, and the rotation of the seat-side member 32 can be further enhanced.

In addition, the peripheral edges of the leg-side member 31 and the seat-side member 32 are attached to the square portions of the leg-side member 31 and the seat-side member 32 by making the facing interval wider than the center-facing interval. Holes 31c and 32c are provided, and leg side members 31 are connected to the connecting portion 12 by mounting screws 38 and 39 passed through the mounting holes 31c and 32c. The seat-side member 32 is detachably attached to the seat 21. At the corner of the leg-side member 3 1, a mounting seat 3 1 e is formed to protrude to the opposite side to the seat-side member 3 2, and the mounting hole 3 1 e is formed at the protrusion of the mounting seat 3 1 e. c is formed.

The four sides of the periphery of the leg-side member 31 are provided with concave engagement portions 40 with a phase difference of about 90 ° by notches, whereby the leg-side member 31 is used as the first member. Make up.

On the other hand, on one side of the seat-side member 32 as the second member, a lever support piece 32d having a substantially U-shaped cross section is protrudingly provided, and between the opposed side walls of the lever support piece 32d. An intermediate portion of the operating lever 42 having a protruding locking portion 41 that can be released from the engaging portion 40 at one end thereof and that can be released from the engaging portion 40 extends along the rotation range of the seat body side member 32. It is swingably mounted in the thickness direction of the seat-side member 32 via a lever shaft 43.

There is provided a spring 44 using a linear spring for urging 42 in a direction in which the locking portion 41 always locks the engaging portion 40. Further, a lever guide piece 32e is formed at the base end of the lever support piece 32d by cutting and raising, and an operation lever 42 swinging by pushing downward is proposed. Then, the locking portion 41 can be satisfactorily detached from the engaging portion 40 by the locking Z.

Contrary to the above configuration, the seat body side member 32 is configured as a first member, the first member is provided with an engagement portion 40, and the leg side member 31 is configured as a second member. However, the second member may be provided with an operation lever 42.

The operation lever 42 is formed in a substantially U-shaped cross section so as to correspond to the lever support piece 32 d, and a lever body 42 a having the locking portion 41 at one end thereof; An operating part 4 2b connected to the other end of the main body 42 a, and a lever body 43 near the other end of the lever main body 42 is attached to the lever shaft 43; The portion on the 41 side can be operated within an opposing interval on the outer peripheral portion of the leg side member 31 and the seat side member 32.

In FIG. 1, reference numeral 45 denotes a synthetic resin closing ring for closing a gap between the leg-side member 31 and the seat-side member 32.

In the chair configured as described above, the mounting screw 38 inserted through the mounting hole 31c of the leg side member 31 and the mounting screw 39 inserted through the mounting hole 32c of the seat member 32 Thus, the turntable 3 is attached to the leg 1 and the seat 2. In this case, since the mounting hole 31c is provided on the mounting seat 31e protruding to the opposite side to the seat body side member 32, the head of the mounting screw 38 is recessed inside the mounting seat 31e. With this arrangement, the leg-side member 31 can be attached to the leg 1 without being obstructed by the seat-side member 32. Further, since the operating lever 42 is urged in the direction of the seat-side member 32 by the spring 44 and the locking portion 41 constantly locks the engaging portion 40, the rotation of the seat 2 is limited. It is definitely blocked.

For example, when a person with a physical disability uses it as a table chair, By placing the backrest 22 so that it intersects the dining table in a normal state where the resting part 22 faces the dining table, the sitting part 2 sits on the seat 2 and the operating part of the operating lever 4 2 4 2 b By operating the lever 42 in a downward direction by grasping and pushing downward, the locking of the locking portion 41 to the engaging portion 40 is released, and the seat body 2 is released. Becomes rotatable. Therefore, simply by operating the operating levers 42 while sitting down and moving the body by 90 °, the seat 2 provided with the operating levers 42 rotates, and the knees are inserted into the lower area of the dining table. It can be in the posture of. When the operating lever 42 is released in this state, the operating lever 42 is swung by the force of the spring 44, and the engaging portion 41 is disengaged from the engaging portion 40 having a phase different by 90 °. As a result, the seat 2 is prevented from rotating. Therefore, it is possible to eat in a calm mood with the seat 2 fixed.

When leaving after eating, grasping the operation part 4 2 b of the operation lever 42 and pushing it downward, the operation lever 42 swings, and the engaging part 41 engages. The engagement with the joint 40 is released, and the seat 2 can be rotated. Therefore, simply by operating the operation lever 42 while sitting on the seat and moving the body by 90 °, the seat 2 rotates, and the knee is moved out of the lower area of the dining table to the outside position, and the seat is set to the sitting position. Can be. When the operating lever 42 is released in this state, the operating lever 42 is swung by the force of the spring 44 and the engaging portion 41 is disengaged. As a result, the seat body 2 is prevented from rotating. Therefore, it is possible to safely leave the seat 2 in a fixed state. The leg-side member 31 provided with the engaging portion 40 is provided with a mounting seat 31 e protruding to the opposite side to the seat-side member 32, so that it is engaged with the locking portion 41. The engagement area with the joint portion 40 can be lengthened, and when the operation lever 42 is not operated by a required amount of operation, the seat 2 can be prevented from rotating accidentally. Can be Further, the leg-side member 31 can be provided at low cost because the annular concave portion 31b, the mounting hole 31c, the mounting seat 31e and the engaging portion 40 can be easily formed by molding.

The operating lever 42 is urged in the reverse direction by the spring 44 so that the locking portion 41 of the operating lever 42 locks the engaging portion 40 from below. The locking of the engaging portion 41 to the engaging portion 40 may be released by pulling the one 42 upward.

(Embodiment 2)

FIG. 7 is an enlarged vertical sectional front view of a main part showing a second embodiment of the chair according to the present invention, and FIG. 8 is a bottom view of only the turntable.

In this chair, instead of the operation lever 42 being pivotally supported by the lever shaft 43 so as to be swingable, the operation lever 42 is configured to be capable of sliding in the longitudinal direction, and The locking part 41 can be released from the locking part 40 with respect to the engaging part 40 by moving operation in the slide direction, and other configurations and operations are shown in FIGS. 1 to 6. Therefore, the same reference numerals are given to the common components, and the detailed description and operation thereof will be omitted.

The operating lever 42 in the second embodiment has a shaft hole 42c through which the lever shaft 43 is inserted, and a slide along the shaft hole. The spring 44 is provided using a coil spring that biases the lever 42 to one side in the slide direction. (Embodiment 3)

FIG. 9 is a perspective view showing Embodiment 3 of the chair according to the present invention, FIG. 10 is a plan view of only the turntable, and FIG. 11 is an enlarged vertical sectional front view of a main part of the chair. Is a front view of only the turntable.

This chair is provided with a grip (operation unit) provided at the other end of the operation lever 42. Instead of arranging 42b on one side or the other side of the seat 2, the middle of the operating lever 42 in the longitudinal direction is branched to provide a pair of other ends, and a seat is provided at these other ends. The grips 4 2 b are provided on both sides of the body 2 so that the operating levers 42 can be operated on both sides of the seat 2 sitting on the body 2. Since the configuration is the same as that of the first embodiment, the same reference numerals are given to the common components, and the detailed description and operation are omitted.

The operation lever 42 in the third embodiment is separated into one end member 4a having the lever body 42a and the other end member 4b having the grip portion 42b, and the lever The main body 42a is the same as in the first embodiment.

The other end side member 4b is provided with a first rod portion 46a extending in a direction intersecting the longitudinal direction of the lever body 42a, and is bent at right angles from both ends of the first rod portion 46a in the same direction. A pair of second rod portions 46b, 46b, and a pressing portion 46c extending from the longitudinal center of the first rod portion 46a along the lever body 42a. The second rod portions 46b, 46b serve as holding portions 42b.

The other end side member 4b is provided in the vicinity of the pressing portion 46c of the first rod portion 46a. It is rotatable on the opposing wall of the lever support piece 32d formed in a substantially U-shaped cross section. Support, a pair of gripping portions 42b, 42b are arranged on both sides of the seat body 2, and a pressing portion 46c is arranged below the lever body 42a. The tip of the lever abuts against the lower surface of the lever body 42a to prevent free rotation of the other end side member 4b. The other end member 4b is divided at the center in the longitudinal direction, and the divided end is inserted into a through hole provided in the lever support piece 32d. The parts 46c are integrated by welding or other joining method. In the third embodiment, since the gripping portions 4 2b are arranged on both sides of the seat 2, the user holds the seat 2 and sits on the seat 2, and the left grip 4 2b or the right grip 4 of the operation lever 42. By gripping 2b and pulling it upward, the other end member 4b swings, and the pressing portion 46c pushes the lever body 42a upward. 2a swings, the locking of the locking portion 41 to the engaging portion 40 is released, and the seat 2 can be rotated. As described above, since the operation levers 42 can be operated on both sides of the seat 2 which is seated, even when one of the left hand or the right hand is inconvenient, the seat 2 can be easily held in a natural sitting position. Can be rotated.

In the third embodiment, instead of rotatably supporting the other end-side member 4b on the seat body 2, the slide member is configured to be slidable as in the second embodiment, and the grips disposed on both sides of the seat body 2 are provided. The contact position of the pressing portion 46c with the one end side member 4a is changed by pushing and pulling the portions 42b, 42b, and the lever main body 42a is rocked and locked. The part 41 may be configured to be disengaged from the engaging part 40 by locking Z.

(Embodiment 4)

FIG. 13 is a bottom view showing the fourth embodiment of the chair swivel according to the present invention.

This chair has a configuration in which the gripping portions 4 2 b of the operation lever 42 are disposed on both sides of the seat body 2, instead of separating the operation lever 42 into one end member 4 a and the other end member 4 b. In addition, the other end member 4b is joined to the one end member 4a by a joining method such as welding, and other configurations and operations are the same as those of the first, second, and third embodiments. Are given the same reference numerals, and their detailed description and operation are omitted.

In the fourth embodiment, the operating lever 42 is configured to be slidable as in the second embodiment, and the gripping portions 4 2b and 4 2b arranged on both sides of the seat body 2 are provided. The locking portion 41 may be locked to and released from the engaging portion 40 by a pushing operation or a pulling operation.

In the first to fourth embodiments described above, the engaging portion 40 is formed in a concave shape, and the operating lever 42 is provided with the protruding locking portion 41. On the contrary, the engaging portion 40 is It is also possible to adopt a configuration in which the operating lever 42 is formed with a projection and a concave locking portion 41 is provided. In addition, the engaging portions 40 are provided with a phase difference of about 90 °, and a plurality of engaging portions 40 are continuously formed on an arc concentric with the rotation center of the seat body side member 32 or are concavely formed at predetermined intervals. It may be provided in a projecting manner, and the number and shape are not particularly limited.

In addition, the chair of the present invention is preferably used especially for a physically handicapped person, but the use thereof is not particularly limited. Industrial applicability

As described above, in the chair and the turntable for the chair according to the present invention, the operation lever can prevent the relative rotation of the first and second members by locking the engagement portion. By operating the first lever, the locking of the operating lever to the engaging portion can be released and the seat body can be rotated. Therefore, even when a physically handicapped person uses the hand, one hand is used. By simply moving the operating lever and operating the operating lever, the seat can be rotated to the required angle and easily seated and seated, reducing the burden on the user. When this happens, the rotation of the seat body can be reliably prevented, and meals and the like can be performed in a calm mood.

In addition, the rotation of the seat body can be permitted or restricted (or vice versa) by a simple operation of simply pushing the swingable operation lever downward or pulling it upward. The power to operate Since the size can be reduced, the burden on the user can be further reduced.

In addition, since the operation lever can be operated on both sides of the second member. Even if one of the left hand or the right hand is inconvenient, the seat body can be easily rotated in a natural sitting posture. .

Further, since the operation lever has a pair of other end portions branched from the middle portion in the longitudinal direction, the operation lever can be simplified and cost can be reduced as compared with a structure using two operation levers.

In addition, even when the chair type is different or the size is different for the same type, the chair can be adapted to the chair by exchanging the other end member having the grip portion without exchanging the entire operation lever. The grip portion of the operation lever can be arranged at the set position, thereby reducing the cost of the operation lever and, consequently, the overall cost.

Further, the mounting seat, the mounting hole, and the engaging portion of the first member can be easily formed by molding and can be provided at a low cost, and the mounting seat is protruded to the opposite side to the second member. With this arrangement, it is possible to increase the moving area of the locking portion near the top and bottom of the mounting seat, and to lengthen the engagement area between the locking portion and the engaging portion. Therefore, when the operation lever is not operated by the required operation amount, the seat body can be prevented from rotating carelessly, and the first member can be obstructed by the second member. It can be installed without it.

In addition, while the engaging portion can be formed by notch, the engaging portion can be provided at a low cost by providing a protrusion-like member on the operating lever by using a joining method such as welding.

Further, since the operating lever is urged in the direction to lock the engaging portion, it is possible to prevent the seat body from rotating carelessly. After the pushing or pulling operation of the operating lever to allow or prevent the rotation of the operating lever, the operating lever can be returned to the state before the operation by releasing the user's hand.

Claims

The scope of the claims

1. A seat on which a seated person sits, a leg for supporting the seat, and a turntable for connecting the seat and the leg so as to be relatively rotatable, the turntable being the leg or the seat A first member attached to one of the first member, a second member attached to the other, and a connecting member interposed between the first member and the second member and connecting the first member and the second member so as to be relatively rotatable. A plurality of engaging portions are provided on the first member so as to be separated from each other along a relative rotation direction, and the second member is engaged with the second member so as to lock the engaging portions. A chair provided with an operation lever, wherein the operation lever locks the engaging portion to restrain relative rotation of the first and second members.

2. The operation lever is provided at one end thereof with a locking portion for locking the engaging portion, and the intermediate portion is swingable around an axis provided along the relative rotation direction. The chair according to claim 1, wherein the chair is pivotally supported by the second member.

3. The operation lever includes a locking portion provided at one end thereof for locking the engagement portion, and a grip portion provided at the other end and disposed on both sides of the second member. The chair according to item 1.

4. The chair according to claim 3, wherein the operation lever is provided with a pair of the other end portions branched from an intermediate portion in the longitudinal direction.

5. The operation lever includes one end member provided with the locking portion and the other end member provided with the grip portion, and the other end member is operated by the grip portion. 5. The chair according to claim 3, further comprising: a pressing portion that presses the one end member by the pressing, and moves the locking portion in a direction in which the locking portion is separated from the engaging portion.

6. The first member is made of a metal plate, and is formed in the vicinity of the periphery thereof so as to protrude to the side opposite to the side of the second member, and the protruding portion has a mounting hole to the leg. The chair according to any one of claims 1 to 5, further comprising:

7. The chair according to claim 6, wherein the engaging portion is provided by a notch between the mounting seats on the periphery of the first member, and the locking portion is a projection.

8. The chair according to any one of claims 1 to 7, wherein the turntable includes a spring that biases the operation lever in a direction in which the engagement portion is locked.

9. A first member attached to one of the leg and the seat of the chair and a second member attached to the other, and interposed between the first member and the second member, and these are relatively rotatable. A coupling member for coupling, wherein the first member is provided with a plurality of engagement portions separated from each other along a relative rotation direction, and the second member is operated by An operating lever for locking the joint is provided, and the operating lever is configured to restrain the relative rotation of the first and second members by locking the engaging portion. Characteristic turntable for chair.

10. The operation lever is provided at one end thereof, has a locking portion for locking the engaging portion, and has an intermediate portion swingably around an axis provided along the relative rotation direction. 10. The chair turntable according to claim 9, which is pivotally supported by the second member.

11. The operating lever is provided at one end thereof with a locking portion for locking the engaging portion, and at the other end, gripping portions provided on both sides of the second member. 10. The turntable for a chair according to claim 9, further comprising:

12. The chair turntable according to claim 11, wherein the operation lever includes a pair of the other end portion branched from an intermediate portion in a longitudinal direction thereof.

13. The operation lever includes an end-side member provided with the locking portion, The other end member provided with the grip portion, the other end member presses the one end member by operating the grip portion, and the locking portion is disengaged from the engagement portion. 13. The turntable for a chair according to claim 11 or 12, further comprising a pressing portion for moving in a direction in which the chair moves.

14. The first member is made of a metal plate, and is formed in the vicinity of the periphery thereof so as to protrude in a direction opposite to the side of the second member, and has a mounting hole for the leg in the protruding portion. The turntable for a chair according to any one of claims 9 to 13, comprising a plurality of mounting seats.

15. The chair turntable according to claim 14, wherein the engaging portion is provided by a notch between the mounting seats on the periphery of the first member, and the locking portion is a projection.

16. The chair turntable according to any one of claims 9 to 15, further comprising a spring for urging the operation lever in a direction to lock the engagement portion.