JPH11225845A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the jerky rotational movement of a seat and noise which result from the rotation resistance of a rotating arm, in a chair having the rotating arm serving as a component element of the slow-rising mechanism or the like of the seat and rotating as the seat rotates. SOLUTION: Either of connections at each end of a rotating arm 10 is made via a connecting mechanism C having the function of absorbing displacements provided with a pivot 33 and a guide groove 10d in which the pivot 33 is slidably engaged. The pivot 33 is provided with a rotating part 11 which can freely rotate relative to the guide groove 10d without being restrained by any of seat 3 and support 2, and a mechanical connection of the connecting mechanism C is achieved via the rotating part 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair used for a grandstand or the like and having a seat rotatably supported by a support between a use position and a standing position.

[0002]

2. Description of the Related Art A chair of this type is known in which a plurality of supports are erected at required intervals, and a seat and a backrest are arranged between the supports. In this chair, the base end of the seat is pivotally supported from both sides by supports, and the seat is rotated so that the seat can be held at the use position and the upright position. On the other hand, such a chair has a pivot arm which is pivotally connected at each end to a position deviated from the pivot point of the seat and a support, and is rotated in conjunction with the rotation of the seat. What is provided is known. For example, in a chair having a seat urging mechanism that automatically raises the seat from a use position to a horizontal position by a spring force or the like, the swing arm controls the swing of the swing arm in a predetermined direction by a damper. It is applied to a thrusting mechanism for indirectly suppressing the automatic rising speed of this seat by applying power.

[0003] Conventionally, this type of rotary arm has a rotary end provided with an elongated hole serving as a guide groove along its longitudinal direction, and its base end is used as a support. A support shaft that is rotatably supported and that is non-rotatably projecting from a position deviated from the pivot point of the seat is rotatably and slidably engaged with the elongated hole.

[0004]

By the way, in this type, while the seat is being rotated, for example, during a writhing operation, a relatively strong turning force is applied to the seat by the seat urging mechanism. The force opposing the rotational power is given via a rotating arm that constitutes a thrusting mechanism. In other words, the rotating arm transmits a strong force, and the shaft is strongly pressed by one inner edge of the long hole due to the force. However, since the support shaft is protruded so as not to rotate, a large sliding resistance is generated between the support shaft and the long hole during the rising operation. In addition, since the support shaft relatively rotates with respect to the long hole in accordance with the rotation of the rotary arm, the sliding speed between the support shaft and the long hole is the moving speed with respect to the long hole of the support shaft. In some cases, the rotation speed is further increased. As a result, a problem occurs in which the rising operation of the seat becomes jerky without smoothness, and abnormal noise due to sliding occurs. On the other hand, in order to reduce this sliding resistance as much as possible and to alleviate the jerky operation, etc., it is considered that the support shaft is coated with a member such as a resin having a small friction coefficient, but the support shaft is Since the seat is projected non-rotatably, a certain portion of the support shaft always slides on the inner edge of the long hole, and the coating layer is peeled off, and the above problem has not been completely solved.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a rotary shaft which is rotatable with respect to a guide groove on the support shaft so that the rotary unit can rotate with respect to the support shaft. Utilizing the ability to rotate, the support shaft can move along the guide groove in a state where the movement resistance to the support shaft is minimized, and the rotation of the seat represented by a rising operation etc. It is intended to make the operation smooth.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is directed to a support, a seat pivotally supported by the support between a use position and an upright position, and a position deviated from a pivot point of the seat. A rotating arm that is connected at each end to a set moving point and a fixed point set to a part of the support, and that rotates around the fixed point in conjunction with the movement of the moving point accompanying the rotation of the seat; A chair comprising: a connecting mechanism having a displacement absorption function including a support shaft and a guide groove for slidably engaging the support shaft. In the above, the supporting shaft is provided with a rotating portion that can freely rotate with respect to the guide groove without being restrained by any of the seat and the support, and a mechanical connection of a connecting mechanism is realized through the rotating portion. It is characterized by having.

However, according to such a structure, since the rotating portion is disposed so as to be freely rotatable, for example, the support shaft may be moved to any one of the inner edges of the guide groove during the rotating operation of the seat. If the sliding resistance at this pressed part exceeds the turning resistance of the rotating part, the rotating part rotates,
It is possible to avoid the occurrence of a large sliding resistance in the pressed portion.
If the sliding resistance is smaller than the rotation resistance of the rotating part, the rotating part does not rotate, and only this small sliding resistance acts on the support shaft. That is, the smaller one of the sliding resistance generated between the guide member and the rotation resistance due to the rotation of the rotating portion acts on the support shaft, and the movement resistance when the support shaft moves in the guide groove is exerted. Can be greatly reduced, and as a result, the turning operation of the seat represented by the rising operation and the like can be made very smooth and quiet. In addition, the rotating portion comes into sliding contact with the guide groove uniformly, so that only a certain portion slides in contact with the conventional one, so that only abrasion of the portion does not increase. Therefore, not only can contribute to the improvement of the durability of the rotating part, but also the rotating part having a small thickness in the axial direction can be used, and the protrusion dimension of the member disposed outside the seat can be reduced. Of course, it is needless to say that there is an effect that a member such as a resin having a small friction coefficient can be used for the rotating portion.

[0008] In a specific embodiment of the chair in which the above-described operation of the present invention is effectively exhibited, the seat is configured to be automatically raised from a use position to an upright position by a seat urging mechanism, and the seat is rotated. An example is provided in which a braking force is applied to the moving arm by a damper that suppresses the rotation speed in a predetermined direction to suppress the automatic rising speed of the seat.

In order to make it possible to replace the rotating part and to facilitate maintenance, the supporting shaft is provided so as to protrude at the moving point of the seat, and the rotating arm pivotally connects the base end to the fixed point. And a guide groove is provided at the rotating end,
A ring member, which is a rotating portion, is detachably and rotatably fitted on the spindle, and the spindle is engaged with the guide groove via the ring member.

As a specific embodiment of the ring member in consideration of simplification of assembly, prevention of detachment, etc., the ring member is formed by forming a concave groove engaging with the inner edge of the guide groove on the outer peripheral surface. As a specific embodiment of the pivot arm for simplifying the insertion of such a ring member into the guide groove, the pivot arm has a ring member on the pivot end side of the guide groove. One in which an opening that can be inserted is formed.

Due to rattling of the seat in the direction of the pivot axis, rattling of the rotating arm in the same direction, or bending,
In order to effectively prevent the pivot arm from interfering with each part of the support, the support should be provided with an abutment surface for inhibiting the pivot arm from moving in the direction of the support by a predetermined amount or more. preferable. On the other hand, as a configuration different from the above, a support, a seat pivotally supported between a use position and an upright position on the support, and a position deviated from a pivot point of the seat are set. A rotating arm that has each end connected to the moving point and a fixed point set on a part of the support, and that rotates around the fixed point in conjunction with the movement of the moving point accompanying rotation of the seat. A chair configured to perform the connection of any one of the rotating arms via a connection mechanism having a displacement absorption function including a support shaft and a guide groove that slidably engages the support shaft. An intermediate member may be interposed between the support shaft and the guide groove such that the inner periphery is rotatably and detachably fitted to the support shaft and the outer edge portion is slidably contacted with the guide groove. Good.

According to this structure, the relative rotation of the support shaft with respect to the guide groove accompanying the rotation of the arm is absorbed as the rotation between the support shaft and the intermediate member. Therefore, the sliding speed between the guide groove and the intermediate member is not affected by the rotation speed of the support shaft. Therefore, the sliding between the guide groove and the intermediate member is performed only at the moving speed of the support shaft with respect to the guide groove, and the sliding speed with the direct guide groove can be reduced as compared with the conventional one. . Furthermore, since the area of the sliding surface between the guide groove and the intermediate member is increased as compared with the conventional one, the sliding resistance can be reduced. It can be smooth and quiet. In addition, not only the wear resistance and strength of the intermediate member can be improved by decreasing the sliding speed or increasing the sliding area, but also the intermediate member having a small thickness in the axial direction can be used. Further, since only the intermediate member can be replaced, maintenance work relating to damage to the intermediate member and the like can be facilitated.

As a specific embodiment of the intermediate member, an intermediate member having a substantially rectangular plate shape having two opposing sides as outer edges may be mentioned. In order to contribute to the simplification of assembly and the prevention of detachment of the intermediate member, it is preferable to form a concave groove at the outer edge to be engaged with the inner edge of the guide groove.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the chair according to the present invention will be described below with reference to the drawings. This chair has a beam pipe 1 held at a predetermined height above the floor as shown in FIGS.
A plurality of supports 2 are erected at predetermined intervals in the width direction of the chair, and a seat 3 and a backrest 4 are provided between the supports 2.
Are arranged respectively. Rising for pivotally supporting both sides of the base end of the seat 3 to the support 2 via a pivot shaft 5 provided at a pivot point X, and pressing the seat 3 against the support 2 in an upright direction. A lever 6 is pivotally mounted, and the rising lever 6 is urged in a seat upright direction by a torsion coil spring 7 held by the support 2.

More specifically, the support 2 is tightly fixed to the beam pipe 1 using a bolt (not shown), and the armrest 8 is pivotally attached to the upper end of the support 2 via a pin shaft 21. Have been. As shown in FIGS. 4 and 5, the vicinity of the lower end of the support 2 has ribs 2 at the front edge and the rear edge of the vertical wall portion 22.
3 are formed, and a boss portion 24 is integrally formed on both surfaces of the vertical wall portion 22. The boss portion 24 is cylindrical and has a bearing 2 inside.
5, and a step portion 24a for mounting the rising lever 6 is formed on the outer periphery of the distal end portion. As shown in FIG. 5, the bearing 25 is a cylindrical body fitted and fixed to the inner periphery of the boss 24, and has a flange at its outer end for preventing the rising lever 6 from coming off. 25a. At the inner end of the bearing 25, an engagement recess 25b and an engagement claw 25c are alternately protruded at predetermined intervals in the circumferential direction, and are provided on one surface side of the support 2. The engaging claw 25c of the bearing 25 attached to the boss 24 provided on the other surface is elastically engaged with the engaging concave portion 25b of the bearing 25 attached to the provided boss 24 so that these two bearings 25 We keep from falling off. Note that cover plates 28 are attached to the outer surfaces of the supports 2 at both ends located at the ends of the beam pipe 1.

The seat 3 comprises a seat body 31 and metal plates 32 attached to both sides of the base end of the seat body 31. Each of the plates 32 is provided with the pivot shaft. 5, a support shaft 33, and a connecting pin 34 are protruded, and the pivot shaft 5 is rotatably fitted to the bearing 25. The support shaft 33 has a columnar shape parallel to the pivot shaft 5, and is fixed to the plate 32 at a movement point X <b> 1 located behind the support shaft 5.

The backrest 4 is a hollow body made by, for example, blow molding, and is held by the support 2 via a link member 41 so as to be able to move up and down. The link member 41 has bearings 42 and 43 at both ends. One of the bearings 42 is pivotally connected to the pin shaft 21 of the support 2, and the other bearing 43 is provided on a side surface of the backrest. Is pivoted to An arm 45 provided at the lower end of the backrest 4 is pivotally connected to the rear end of the seat 3 via the connecting pin 34.

As shown in FIGS. 4 and 5, the rising lever 6 is made of sheet metal having a shaft hole 61 at its base end, and the shaft hole 61 is fitted into the step portion 24a of the boss portion 24. And can be freely rotated. The distal end portion 62 is formed to be slender, and one side edge of the distal end portion 62 can press the outer peripheral surface of the support shaft 33 of the seat 3. The other side edge of the rising lever 6 is provided with a recess 63 for engaging the torsion coil spring 7.

The torsion coil spring 7 is wound around the outer periphery of the boss 24. And this spring 7
Is fixed to the support body 2 and the other end 72 is engaged with the concave portion 63 of the rising lever 6 so as to urge the rising lever 6 to rotate in the upright direction. Thus, the seat urging mechanism A in this embodiment includes the boss 24, the rising lever 6 rotatably supported by the boss 24, and the torsion coil spring 7.
It is provided with.

The armrest 8 has a downward U-shape in cross-section and is pivotally attached to the upper end of the support 2 via the pin shaft 21. When no external force is applied, the armrest 8 rotates in a direction in which the front end rises. The center of gravity is set as follows. When the free end link member 41 rotates upward due to the rise of the backrest 4, the free end link member 41 is pressed by the link member 41, and is used horizontally.
It is designed to rotate up to.

Thus, on both sides of each of the seats 3 of such a chair, there is provided a thrusting mechanism B as shown in FIGS. The thrusting mechanism B includes a damper 9 provided at a fixed point X2 of the support, and a rotating arm 10 shown in FIGS. 6 and 7 attached to an operating shaft 92 of the damper 9. The pivot arm 10 is pivoted in conjunction with the seat 3, and the pivot arm 10 is rotated in a predetermined direction m.
The damping force is applied to the rotation of the seat 3 to indirectly suppress the rising speed of the seat 3. More specifically, the damper 9 includes a main body 91 having a bottomed cylindrical shape, a base end side rotatably inserted into the main body 91, and a distal end portion 92 a protruding outward from an end surface of the main body 91. A normal rotary oil damper having an operating shaft 92 which is
The configuration is such that a relatively large resistance can be exerted against the rotation of the operating shaft 92 shown in FIG. The tip of the operating shaft 92 has a flat surface 92b for preventing rotation.
The distal end portion 92a of the operating shaft 92 is press-fitted into a mounting hole 10b provided in the base end portion 10a of the rotating arm 10 so that the rotating arm 10 and the operating shaft 92 are integrated. So that it can rotate. Body 9 of damper 9
Reference numeral 1 denotes a support 2 outside the rotation locus r of the support shaft 33.
Is mounted so that it cannot rotate. Specifically, a circular mounting hole 29 is formed in the support 2, the main body 91 is inserted into the mounting hole 29, and the main body 91 is fixed to the support 2 with a set screw 93.

In this embodiment, the rotating end 10c of the rotating arm 10 fixed to the operating shaft 92 is extended to a position on the rotating locus r of the support shaft 33, and the rotating arm 10 A guide hole 10d having a long hole shape is penetrated in the rotation end portion 10c along the longitudinal direction, and the ring member 11 serving as a rotation portion
Is slidably engaged with the guide groove 10d, and is detachably and rotatably fitted to the support shaft 33. Thus, the lever 33 and the guide groove 10d constitute a coupling mechanism C.

As shown in FIGS. 8 and 9, the ring member 11 is made of a resin having a through hole 11c fitted into the support shaft 33, and has a concave groove 11b on its outer peripheral surface 11a.
Is formed. The concave groove 11b has its groove width set slightly larger than the thickness dimension of the rotating arm 10, and as shown in FIG.
0f. In this engagement state, the bottom surface 11d of the concave groove 11b is
e, 10f, or so that only one of them is in contact with the other and is close to the other. An opening 10g into which the ring member 11 can be inserted is formed on the rotation end side of the guide groove 10d.

Further, in this embodiment, as shown in FIGS. 5, 10, 11 and 12, the vertical wall portion 22 of the support is
The L-shaped contact member 12 as viewed from the side, which is formed by the vertical portion 12a and the horizontal portion 12b, is screwed. The inner edge 12c of the abutment member has a partial arc shape slightly outside the rotation locus r of the support shaft 33 so as not to interfere with the rotation of the support shaft 33. Also, this contact member 12
The contact surface 12d, which is the outer surface, is substantially flush with the outer surface of the rib 23, and is attached so as to be close to the ring member 11. ,
The rotation arm 10 can be prevented from approaching the support body 2 by a certain amount or more due to the backlash of the rotation arm 10 in the same direction, for example, by contact with the end surface 11 e of the ring member 11. .

According to the chair having such a configuration, as shown in FIG. 3, the seat 3 is moved from the upright position by a load caused by the weight of the occupant against the urging force of the spring 7. It rotates to the state shown in FIG. 2 in the substantially horizontal use position. When the occupant stands from this state, the urging force of the spring 7 is transmitted to the support shaft 33 via the rising lever 6, and the support shaft 33 is pressed downward. As a result, the seat 3 rotates in the upright direction and the backrest 4 descends, and as shown in FIG. 3 again, the seat 3 overlaps with the front surface of the backrest 4 and stands up. At this time, the turning arm 10 is turned in the counterclockwise direction in the figure, but the resistance force of the damper 9 continuously acts on the support shaft 33 via the turning arm 10 to achieve the thrusting mechanism B. The action is given, and the rising operation of the seat 3 becomes slow.

On the other hand, the pivot arm 10 pivots between the state shown in FIG. 12 and the locked state shown in FIG. 14 via the intermediate state shown in FIG. I do. At this time, as shown in FIGS. 12 to 14, the ring member 11 moves along the guide groove 10 d. For example, during the rising operation, the seat 3 is provided with a relatively strong turning force by the seat urging mechanism A. On the other hand, the force opposing the rotational power is applied to the rotating arm 10 constituting the thrusting mechanism B.
Has been given through. That is, the rotating arm 10 transmits a strong force, and one inner edge 10 e of the guide groove 10 d is strongly pressed by the ring member 11 due to this force. Therefore, the sliding resistance at this portion is greater than that at the other inner edge 10f. As a result, the ring member 11 rolls with respect to the one inner edge 10e, and the movement resistance acting on the support shaft 33 is different from the rotation resistance caused by the rotation of the ring member 11 and the other resistance of the ring member 11 which is not pressed. There is only a small sliding resistance generated between the inner edge 10f. Of course, this ring member 1
When 1 is not in contact with the other inner edge 10f, the sliding resistance becomes 0. Conversely, when the seat 3 is rotated to the use position, the ring member 11 rolls with respect to the other inner edge 10f, and the movement resistance acting on the support shaft 33 is reduced.
Is only a small sliding resistance generated between the rotation resistance generated by the rotation of the ring member 11 and the one unpressed inner edge 10 e of the ring member 11.

As described above, the sliding of the ring member 11 with respect to the guide groove 10d is performed at the portion where the sliding resistance acting on the ring member 11 is the smallest, so that the guide groove 10d is formed.
The movement resistance when the ring member 11 and the support shaft 33 move inside can be greatly reduced. Therefore, seat 3
Can be made extremely smooth and quiet, and the ring member 11 itself rotates, so that the bottom surface 11d of the concave groove 11b, which is the sliding surface thereof, is formed by the inner edge 10e of the guide groove 10d. Sliding uniformly at 10f does not occur, so that only a certain portion slides as in the conventional example, and the abrasion at that portion does not increase. That is, in addition to the above-described reduction of the sliding resistance, the degree of freedom in design can be increased, for example, a member having a small thickness or a resin having a small friction coefficient can be used for the ring member 11. It also has the effect.

In particular, as in the present embodiment, the one provided with the rolling stirrer mechanism B for suppressing the automatic rising speed of the seat 3 has a strong turning action by the seat urging mechanism A during the writhing operation as described above. Power and throttling mechanism B
And the force opposing this turning force acts on the rotating arm 10, and the ring member 11 is strongly pressed by the guide groove 10d. Therefore, in the conventional device, jerky operation and abnormal noise due to sliding resistance are easily generated, but according to the present embodiment, the seat 3 can be surely rotated smoothly and quietly, and the effect is remarkable. Becomes

Further, the ring member 11 has a concave groove 1 on its outer peripheral surface which engages with the inner edges 10e, 10f of the guide groove 10d.
Since the ring 1b is formed, the movement of the ring member 11 in the axial direction can be suppressed at the same time by engaging with the guide groove 10d, which can contribute to omitting the mechanism and simplifying the assembly. In addition, an opening 10 into which the ring member 11 can be inserted into the rotation end side of the guide groove
Since g is formed, insertion of the ring member 11 having the above-described shape into the guide groove 10d can be particularly simplified.

Further, in the present embodiment, all the peripheral mechanisms such as the mechanism for pivotally supporting the seat 3 and the seat urging mechanism A or the thrusting mechanism B are provided outside the seat 3. Therefore, there is an effect that it is possible to easily cope with one having a different frontage dimension of the seat 3. As another embodiment, FIGS.
As shown in FIG. 17, the inner periphery 111c is rotatably and detachably fitted to the support shaft 33 between the support shaft 33 and the guide groove 10d, and the outer edge portion 111a is slidable with respect to the guide groove 10d. And an intermediate member 111 which is brought into surface contact with the intermediate member 111. More specifically, the intermediate member 111
Is a substantially square plate-like member fitted on the support shaft 33 instead of the ring member 11 described above, and a support shaft insertion hole 111e through which the support shaft 33 can be inserted into a central portion, and a concave groove formed on the outer edge portion 111a. 111b. In this embodiment, since the intermediate member has a substantially square shape, all four sides are the outer edges 111a, and the concave grooves 111 on the two opposite sides are formed.
b is engaged with each inner edge 10e, 10f of the guide groove 10d. In the other embodiments, members corresponding to those in the above embodiment are denoted by the same reference numerals.

In such a case, the rotating arm 10
The relative rotation of the support shaft 33 with respect to the guide groove 10d due to the rotation of is absorbed as the rotation between the support shaft 33 and the intermediate member 111. Is performed only at the moving speed of the support shaft 33 with respect to the guide groove 10d without being affected by the rotation.
That is, the sliding speed with the direct guide groove 10d can be reduced as compared with the conventional one. Further, the guide groove 10d
Inner edges 10e and 10f and bottom surface 111d of concave groove 111b
Are in surface contact with each other and the area of the sliding surface is increased, so that the sliding resistance can be reduced. As a result, the rising operation of the seat 3 can be made smooth and quiet, and the wear resistance and strength of the intermediate member 111 can be improved by decreasing the sliding speed and increasing the sliding area. .

The present invention is not limited to the above embodiments. For example, the position of the support shaft of the seat and the rotary damper are reversed, the damper supports the base end of the rotation arm, and the guide groove of the rotation arm is engaged with the rotation unit mounted on the support shaft. A configuration may be used. Further, a columnar member may be simply provided so as to be rotatable from a seat or a support. In this case, the support shaft is a columnar member, and the rotating portion is a portion that rotatably supports the support shaft on a seat or a support, and the support shaft is directly in the guide groove. Although they are engaged with each other, such a device can provide the same operation and effect as the embodiment.

In addition, the present invention is not limited to the illustrated examples described above, and various modifications can be made without departing from the spirit of the present invention.

[0034]

As described above in detail, according to the present invention, since the rotating portion is disposed so as to be freely rotatable, the support shaft is positioned inside the guide groove during the turning operation of the seat. When one of the edges is strongly pressed, the generation of strong sliding resistance at the pressed portion can be avoided by the rotation of the rotating unit. As a result, the movement resistance when the support shaft moves in the guide groove can be greatly reduced, and the rotation operation of the seat represented by the writhing operation and the like can be made very smooth and quiet. Further, for example, if the rotating part is fitted on the support shaft and comes into contact with the guide groove, the rotating part comes into sliding contact with the guide groove uniformly, and only a certain part is slid like the conventional one. There is no increase in the wear of the part upon contact. Therefore, not only can contribute to the improvement of the durability of the rotating part, but also the rotating part having a small thickness in the axial direction can be used, and the protrusion dimension of the member disposed outside the seat can be reduced. Of course, it is needless to say that there is an effect that a member such as a resin having a small friction coefficient can be used for the rotating portion.

The seat is automatically raised by a seat urging mechanism, and a braking force by a damper is applied to the rotation of the rotary arm in a predetermined direction to suppress the automatic rising speed of the seat. Since the rotating part is strongly pressed by the guide groove at the time of the seat rising operation, the effect can be made particularly remarkable by applying the present invention. Moreover, such a configuration is
The purpose of the present invention is to prevent the occurrence of collision noise due to the rapid rising operation of the seat, and to provide a smooth movement and quietness to the rotating operation of the seat,
It is particularly suitable for that purpose.

If the ring member, which is a rotating portion, is detachably and rotatably fitted on the support shaft protruding at the moving point of the seat, maintenance relating to damage to the ring member can be performed. The effect that it can be performed by replacing only the member is also exerted. Furthermore, if the ring member is formed by forming a concave groove on the outer peripheral surface to be engaged with the inner edge of the guide groove,
A mechanism for suppressing the movement of the ring member in the axial direction can be omitted, which can contribute to a reduction in the number of members and simplification of assembly, and can prevent the ring member from coming off. Further, if the rotating arm has an opening at one end side of the guide groove into which the ring member can be inserted, the insertion of the ring member having the above-described shape into the guide groove can be particularly simplified. .

Further, if the support is provided with a contact surface for inhibiting the rotation arm from moving more than a predetermined amount in the direction of the support, the seat may rattle in the direction of the pivot shaft. In addition, it is possible to effectively prevent the rotation arm from interfering with each part of the support due to rattling or bending of the rotation arm in the same direction. As another configuration, an intermediate member in which the inner periphery is rotatably and detachably fitted to the support shaft and the outer edge portion is slidably contacted with the guide groove between the support shaft and the guide groove. In this case, the relative rotation of the support shaft with respect to the guide groove due to the rotation of the arm is absorbed as the rotation between the support shaft and the intermediate member, so that the guide groove The sliding between the shaft and the intermediate member is performed only at the moving speed of the support shaft with respect to the guide groove without being affected by the relative rotation. That is, the sliding speed with the direct guide groove can be reduced as compared with the conventional one. Furthermore, since the area of the sliding surface between the guide groove and the intermediate member is increased as compared with the conventional one, the sliding resistance can be reduced, and the rising operation of the seat can be made smooth and quiet. In addition, not only the wear resistance and strength of the intermediate member can be improved by decreasing the sliding speed or increasing the sliding area, but also the intermediate member having a small thickness in the axial direction can be used. Further, since only the intermediate member can be replaced, maintenance work relating to damage to the intermediate member and the like can be facilitated.

If such an intermediate member has a substantially rectangular plate shape whose outer edges are the two opposite sides, it is easy to manufacture, and the outer edge is engaged with the inner edge of the guide groove. If the groove is formed, a mechanism for suppressing the movement of the intermediate member in the axial direction can be omitted, which can contribute to a reduction in the number of members and simplification of assembly, and can prevent the intermediate member from coming off.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side view showing the same embodiment.

FIG. 3 is a side view showing the operation of the embodiment.

FIG. 4 is an exploded perspective view of a main part of the embodiment.

FIG. 5 is a front sectional view showing a main part of the embodiment.

FIG. 6 is a front view showing the rotating arm of the embodiment.

FIG. 7 is a side view in FIG. 6;

FIG. 8 is a side view showing the rotating unit of the embodiment.

FIG. 9 is a front view in FIG. 8;

FIG. 10 is a front view showing the contact member of the embodiment.

FIG. 11 is a side view of FIG.

FIG. 12 is a side sectional view showing a main part of the embodiment.

FIG. 13 is a sectional side view of a main part showing the operation of the embodiment.

FIG. 14 is a sectional side view of a main part for showing the operation of the embodiment.

FIG. 15 is a side view showing an intermediate member of another embodiment.

FIG. 16 is a front view of FIG.

FIG. 17 is a side sectional view showing a main part of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 ... Support body 3 ... Seat 9 ... Damper 10 ... Rotating arm 10a ... Base end 10c ... Rotating end 10d ... Guide groove 10e, 10f ... Inner edge 10g ... Opening 11 ... Rotating part (ring member) 11a ... Outer peripheral surface 11b ... Concave groove 12d ... Abutment surface 33 ... Support shaft 111 ... Intermediate member 111a ... Outer edge 111b ... Concave groove 111c ... Inner periphery A ... Seat biasing mechanism B ... Srawling mechanism C ... Connecting mechanism X ... Pivot support point X1: Moving point X2: Fixed point

Claims (9)

[Claims] 1. A support, a seat pivotally supported by the support between a use position and an upright position, a moving point and a support set at a position deviated from a pivot point of the seat. A rotating arm having each end connected to a fixed point set on a part of the body and rotating about the fixed point in conjunction with movement of the moving point accompanying rotation of the seat; In a chair configured to perform any one of the above-described connections via a connection mechanism having a displacement absorption function including a support shaft and a guide groove that slidably engages the support shaft, the support shaft includes: A chair provided with a rotating portion that can freely rotate with respect to the guide groove without being restrained by any of the seat and the support, and mechanically connecting the connecting mechanism via the rotating portion; . The seat is configured to be automatically raised from a use position to a standing position by a seat biasing mechanism,
2. The automatic arm according to claim 1, wherein a braking force is applied to the pivot arm by a damper that suppresses a rotational speed of the pivot arm in a predetermined direction to suppress an automatic rising speed of the seat. Chair. 3. A pivot shaft is provided so as to protrude at a movement point of a seat. The pivot arm has a base end pivotally connected to the fixed point and a guide groove provided at the pivot end. A ring member, which is a rotating part, is detachably and rotatably fitted on the spindle, and the spindle is engaged with the guide groove via the ring member. The chair according to claim 1 or 2, wherein the chair is made. 4. The chair according to claim 3, wherein the ring member has a concave groove formed on an outer peripheral surface thereof so as to engage with an inner edge of the guide groove. 5. The chair according to claim 4, wherein the pivot arm has an opening at the pivot end side of the guide groove, into which a ring member can be inserted. 6. The support according to claim 1, wherein the support has a contact surface for inhibiting movement of the rotary arm in the direction of the support beyond a predetermined value. Chair. 7. A support, a seat pivotally supported by the support between a use position and an upright position, a moving point and a support set at a position deviated from a pivot point of the seat. A rotating arm having each end connected to a fixed point set on a part of the body and rotating about the fixed point in conjunction with movement of the moving point accompanying rotation of the seat; A chair having a displacement absorbing function provided with a support shaft and a guide groove for slidably engaging the support shaft. An intermediate member whose inner periphery is rotatably and detachably fitted to the support shaft and whose outer edge portion is slidably contacted with the guide groove is interposed between the groove and the groove. Chair. 8. The chair according to claim 7, wherein the intermediate member has a substantially rectangular plate shape having two opposite sides as outer edges. 9. The chair according to claim 7, wherein a concave groove is formed at an outer edge portion to engage with an inner edge of the guide groove.