JP3216624B2 - Combination device for raising and lowering the retractable chair - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retractable chair suitably used for a movable seat.

[0002]

2. Description of the Related Art Recently, for use in multipurpose halls and the like, in use, each floor is spread on a bed and a chair placed thereon can be used. A variety of movable seats have been developed which can be retracted to a storage position where they overlap each other and can be stored compactly. In addition, such a movable viewing seat is provided with an elevating operation connecting device, and a plurality of chairs arranged side by side on the corrugated floor move up and down at the same time, and when the corrugated floor is unfolded, an available erecting position. When the floor is stored, it is configured to be in the lying position on the floor surface.

[0003] As one of such a raising / lowering operation coupling device, a plurality of retractable chairs are supported by base units arranged in a row on a floor surface, and rotation of a common drive shaft penetrated through these base units is controlled. There is known a configuration in which the retractable chairs can be moved up and down at the same time by utilizing them. Specifically, each base unit is provided with an intermediate shaft that rotates in conjunction with the retractable chair's raising and lowering operation, and a common drive shaft is connected to the intermediate shaft of each base unit via a gear train, for example. A chair supported by a dummy unit that is connected to the intermediate shaft of the base unit every other thing or common drive shaft, and is not connected to the common drive shaft, for example, is linked by a connecting beam laid across the back of the chair I was trying to make it.

[0004]

However, in the former, the twisting of the common drive shaft causes a delay in the raising and lowering operation of the chair located on the other end side as compared with the chair located on the one end side. In addition, there is a problem that the cost is increased, for example, a gear train is required for each base unit and the number of parts is increased. Further, the operation delay is not preferable for the operation and the life of the apparatus. On the other hand, in the latter case, the connection beam increases the connection rigidity of the chair as a whole, so that it is possible to reduce the operation delay to some extent. However, the connection beam is exposed, which is not preferable in appearance, and the connection beam is unfavorable. In addition, it is necessary to design so that other members do not interfere. In particular, when a chair having a heavy atmosphere such as a dedicated theater chair is required, such a structure tends to lack a sense of grade.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-described problems, and has a structure in which a common drive shaft is intermittently connected to an intermediate shaft provided in a base unit, and each base shaft is connected to a base unit. The main object is to connect the intermediate shafts of the units to each other so that the appearance is reasonably good and the chairs do not delay in raising and lowering operations.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the retractable chair linking apparatus according to the present invention, a plurality of retractable chairs are supported by a base unit arranged on the floor and penetrated by these base units. The retractable chair is configured to be able to be simultaneously raised and lowered between a standing position and a falling position by utilizing the rotation of the common drive shaft, and each base unit is provided with the retractable chair. in conjunction with the raising倒動work together providing the intermediate shaft these intermediate axes synchronously rotatably coupled to rotate, the intermediate addition of the retractable chair common drive shaft
It is designed to move up and down in conjunction with the connection of the axes.
A series of base units, comprising a drive unit having an intermediate shaft connected to the common drive shaft and a dummy unit having no intermediate shaft connected to the common drive shaft, wherein one or A plurality of dummy units are provided.

In such a case, since the common drive shafts are connected to the intermediate shafts of the drive units provided at predetermined intervals, gear trains and the like necessary for this connection are provided for each base unit. It is not necessary to reduce the number of parts, simplify the assembly, or reduce the cost. In addition, since each chair operates in conjunction with the common drive shaft and the intermediate shafts in conjunction with each other to move up and down, sufficient rigidity of connection between the chairs is obtained, and a phase shift related to the raising and lowering operation is reduced, The appearance can be improved. Further, since the common drive shaft and the intermediate shaft are provided on the base unit, the common drive shaft and the intermediate shaft are housed in the decorative cover covering the base unit, and the appearance is extremely improved. Becomes possible.

[0008] As a specific embodiment of the connection between the intermediate shaft and the common drive shaft, the intermediate shaft and the common drive shaft provided in the drive unit are connected by a gear train pivotally supported by the drive unit. What you do. As a specific embodiment for easily realizing the configuration of the present invention, a retractable chair includes a front support having a lower end supported by a base unit so as to be rotatable in the front-rear direction, and a rear support behind the front support. A rear strut that is provided and a lower end portion of the base unit is supported rotatably in the front-rear direction, an elbow member having each end pivotally attached to an upper end portion of the front strut and the rear strut, and an inside of the base unit. An interlocking mechanism that is arranged and cooperates with the elbow member to interlock the front and rear struts between a standing position and a falling position to perform a tilting operation, and to support a seat between adjacent front struts. The interlocking mechanism is configured to support the back between the adjacent rear supports, and the interlocking mechanism is configured to convert the rotation of the intermediate shaft into a tilt of the front support. Second conversion means for converting rotation of the shaft into tilting of the rear support. Shall is preferable.

In order to make it possible to freely set the inclination angle of the rear column in the upright position and to make the appearance favorable, and to reduce the size of the chair in the lying position, the second conversion means must be mounted on the rear column. In the standing position, the lower end portion is moved in accordance with the raising / lowering operation so as to be located at a predetermined front position in the upright position, and in the lying position at a predetermined rear position set behind the predetermined front position. desirable.

As a preferred embodiment for smoothing the operation of the interlocking mechanism and favorably raising and lowering the chair,
The second conversion means includes a moving arm rotatably supported by the base unit back and forth, and a link group connecting the moving arm to an intermediate shaft and rotating in conjunction with the intermediate shaft, The moving arm is pivotally connected to the lower end of the rear column.

In order to suitably close the opening provided in the base unit in order to secure a space for the lower end of the rear support to move between a predetermined front position and a predetermined rear position, a lid is attached to the moving arm. Preferably, it is formed so that the opening is closed by the lid at the standing position. To reduce the thickness of the chair in the lying position and to make the thickness of each column in the standing position enough to give the user a sense of stability, solid feeling, etc. It is desirable to provide a support so that the front support and the rear support can be overlapped in a side view.

In a preferred embodiment, the user can more strongly give a sense of stability, profound feeling, and the like in the standing position, in the standing position, the front support stands upright in a substantially vertical state, and the rear support supports the lower end of the front support. Are set so as to be in a rearwardly inclined posture in a state of being partially overlapped with the lower end portion of the lens.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In this embodiment, a retractable chair C according to the present invention is applied to a movable floor seat 1 of a corrugated floor type. As shown in FIGS. 1 and 2, the movable seat 1 includes a plurality of floors 2, and the floors 2 are mutually overlapped with a development position (see FIG. 1) where the floors 2 are developed. The storage position (see FIG. 2) is configured to be able to expand and contract. The structure of the traveling frame for supporting each floor 2 and the drive mechanism for moving the traveling frame forward and backward are the same as those of the prior art, and therefore the description thereof is omitted.

As shown in FIG. 3, a plurality of retractable chairs C are arranged on the floor 2 along the horizontal direction. As shown in FIG. 4 and the like, each of the retractable chairs C is disposed so as to be capable of raising and lowering on the stepped floor 2. A front column 5 pivotally supported at the lower end so as to be rotatable in the front-rear direction, and a lower column pivotally mounted on the base unit 3 so as to be rotatable in the front-rear direction. Supporting rear support 6 and front support 5
And an elbow member 7 having each end pivotally attached to each of the upper ends 5b, 6b of the rear strut 6 and the base unit 3, and the front and rear struts 5, 6 are erected in cooperation with the elbow member 7. An interlocking mechanism 10 for interlocking and raising and lowering between a position and a lying position, a seat 8 pivotally supported between adjacent front supports 5, and a back integrally fixed between adjacent rear supports 6. And a back 9 mainly composed of a plate 9a.

More specifically, the base unit 3 is composed of
It consists of a pair of face plate members 31 standing upright,
The front strut 5, the rear strut 6, and the like are supported between these face plate members 31. Further, a decorative cover (not shown) is provided between the adjacent base units 3 so as to cover the base unit and the inside thereof so as to be invisible. The front support 5 is a thick flat plate having a support shaft 15a integrally protruding left and right from the lower end thereof.
5 a is pivotally supported near the front edge of the base unit 3. The rear support 6 is a sheet metal member having an L-shaped cross section attached to both side edges of the back plate 9a, and is disposed inside the rear of the front support 5 and its lower end 6a moves to the base unit 3 as described later. The arm is indirectly pivoted through the arm 12 for use. The elbow member 7 is a hollow body opening downward and rearward, and is fitted with caps on the upper ends 5 b and 6 b of the front support 5 and the rear support 6. An intermediate portion of the elbow member 7 is pivotally attached to the front support 5 via a shaft 15b, and a rear end of the elbow member 7 is pivotally attached to the rear support 6 via a shaft 15c.

The seat 8 is disposed between the inner surfaces of the adjacent front columns 5 so as to be writable. The base 8 is pivotally supported by a bearing (not shown) provided on the inner surface of the front column 5. ing. The seat 8 is biased by a spring (not shown) so that the seat 8 can automatically rotate from a substantially horizontal seating position to an oblique rising position. Also, when the seat 8 in the rising position is further raised,
The seat 8 can rotate to a position close to the back 9.

The back 9 is constructed by attaching a cushion material 9b to an appropriate position on the front side of the back plate 9a. As shown in FIGS. 4 and 5, the interlocking mechanism 10 converts the rotation of the front support 5 into the rotation of the intermediate shaft 15 e and the intermediate shaft 15 e supported on each base unit 3 so as to be rotatable in the front-rear direction. And a second converting means 102 for converting the rotation of the intermediate shaft 15 e into the rotation of the rear support 6.

The first conversion means 101 includes a crank arm 16 fixed to the intermediate shaft 15e and extending in the radial direction.
A side-viewing first link member 17 having each end pivotally connected to the pivot end of the crank arm 16 and a portion X1 deviated from the support shaft 15a of the front support 5 is provided. . On the other hand, the second conversion means 102
Arm 12, which is rotatably supported back and forth, the crank arm 16 fixed to an intermediate shaft 15e, a rotating end of the crank arm 16 and the movement arm 12.
And a second link member 18 having each end pivotally connected to one of the rotation ends 12b. The second link member 18 and the crank arm 16 correspond to a link group. The moving arm 12 has a U-shaped cross section in which side plates 12c are erected from both side edges of the center plate 11, and the center of the side plate 12c is pivotally connected to the base unit 3 via a support shaft 15f. Supported. Then, the other rotating end 12 a is pivotally connected to the lower end 6 a of the rear support 6, and
One rotation end portion 12b located on the substantially opposite side across 5f
Are connected to the second link member 18.

The lower arm 6 of the rear support 6 is rotated by rotating the moving arm 12 in accordance with the raising and lowering operation.
a is moved so as to be located at a predetermined front position in the upright position and to be located at a predetermined rear position behind the predetermined front position in the lying position. Further, in the present embodiment, the central plate portion 11 plays the role of a lid. Specifically, in the standing position, the central plate 1
1 is set so as to be flush with the upper surface of the base unit 3 and to close an opening formed between the face plate members 31 constituting the base unit 3. Further, a bolt B is attached to one of the rotating ends 12a of the moving arm 12.
Is provided, and the tip of the bolt B is brought into contact with the rear end face of the front support 5 to regulate the standing position.

In this embodiment, as shown schematically in FIG. 3, a common drive shaft N is passed through a plurality of base units 3 arranged in a row along the left-right direction, and each base unit 3 is connected. A drive unit 3A (also shown in FIG. 6) having an interlocking mechanism 10 connected to the common drive shaft N via a gear train G, and an interlocking mechanism 1 not connected to the common drive shaft N.
0 and a plurality of dummy units 3B are arranged between the drive units 3A, while the interlocking mechanism 10 in each base unit 3 is arranged. Intermediate shaft 1 to configure
An elevating operation connecting device that connects the 5e with each other so as to be synchronously rotatable is provided.

More specifically, as shown in FIG. 3, the common drive shaft N has a cylindrical shape with one end connected to an electric motor via a coupling CP1, and a bush BS is provided near the lower end of each base unit 3. Is pivoted through. Gear train G
Is a combination of a plurality of wheel teeth and pinion teeth pivotally supported by the drive unit 3A as shown in FIGS. 3 and 6, for example, and reduces the rotation of the common drive shaft N to reduce the rotation of the drive unit 3A. The power is transmitted to the intermediate shaft 15e.

The adjacent intermediate shafts 15e are rigidly connected via a coupling CP2. Specifically, as shown in FIG. 5, a chamfered portion R is provided at the tip of the intermediate shaft 15e, and the coupling CP2 is engaged with the chamfered portion R.
And the intermediate shafts 15e are connected to each other. Next, the raising and lowering operation of such a retractable chair will be described below together with the operation of the raising and lowering operation connecting device.

In the upright position, as shown in FIG.
The front support 5 stands substantially vertically, and the rear support 6 has a lower end 6.
The front edge portion of the front support 5 is set to be in a rear-tilted upright posture in a state of being overlapped with the rear edge portion of the lower end portion 5a of the front support 5 in a side view. In this state, the lower end 6a of the front support 5 is located at a predetermined position in front,
Further, the crank arm 16 is set to have a posture extending rearward. On the other hand, the second link member 18 is in a posture in which the other end is located rearward, and the moving arm 12 connected to the other end of the second link member 18 rotates one of its ends. End 12b
It is located behind the support shaft 15f, and
a is located in front of the support shaft 15f.
In this state, the center plate 11 of the moving arm 12 is
Is set so as to close the opening formed between the face plate members 31 of the base unit 3 as described above.

The tilting of the retractable chair C from the standing position to the lying position is performed by rotating the common drive shaft N. The rotation of the common drive shaft N is transmitted to the intermediate shaft 15e via a gear train G provided in the drive unit 3A. On the other hand, since the intermediate shafts 15e are connected to each other, the rotation of the common drive shaft N is also transmitted to the intermediate shaft 15e of the dummy unit 3B via the intermediate shaft 15e of the drive unit 3A. Then, the intermediate shaft 1 of each base unit 3
The rotation of the first conversion unit 101 and the second conversion unit 1
02 is converted into tilting of the front strut 5 and the rear strut 6 respectively.

First, the operation of the front support 5 will be described in detail.
The crank arm 16 integrally provided on the intermediate shaft 15e
With the rotation of the intermediate shaft 15e, the end of the rotation is moved to the intermediate shaft 15e.
It rotates forward so as to pass above e.
As a result, as shown in FIG. 7, the front strut 5 connected to the crank arm 16 via the first link member 17 is formed.
By pivoting the crank arm 16 forward, the pivot point X1 is urged to pivot forward and tilts forward about the support shaft 15a.

Next, the operation of the rear support 6 will be described in detail.
Since the upper end 6b of the rear support 6 is connected to the upper end 5b of the front support 5 via the elbow member 7, as shown in FIG.
The rear support 6 is tilted forward in conjunction with the forward tilt of the front support 5. On the other hand, as the crank arm 16 rotates forward, the second link member 1 is attached to the crank arm 16.
One pivotal end 12b of the transfer arm 12 connected via the pivot 8 rotates forward. As a result, the other rotating end 12 of the moving arm 12 located on the opposite side
a rotates rearward, and the lower end 6a of the rear support 6 also rotates rearward. Thus, the rear support 6 has its upper end 6a forward and its lower end 6b
And tilt it forward while moving it back. Note that the lid, that is, the center plate portion 11 of the moving arm 12 rotates so as to stand up so as not to interfere with the lower end portion 6a of the moving rear support 6.

Then, in the lying position, as shown in FIG. 8, the rear support 6 and the front support 5 are each in a substantially horizontal posture in a partially overlapped state in a side view. In this state, the lower end 6a of the rear support 6 is located at the rear set position. In the lying position, the seat 8 is in a posture of being sandwiched between the back 9 and the floor 2. The movement from the lying position to the standing position is performed in the reverse operation, and thus the description is omitted.

As described above, according to the present embodiment, the common drive shafts N are connected to the interlocking mechanism 10 of the drive units 3A arranged at predetermined intervals. It is not necessary to arrange every base unit 3,
The number of parts can be reduced, assembly can be simplified, or cost can be reduced. In addition, since the interlocking mechanism 10 arranged in each base unit 3 is interlocked by the connection of the intermediate shafts 15e in addition to the common drive shaft N, a sufficient connection rigidity between the chairs C is easily obtained, and It is possible to reduce the phase shift related to the raising / lowering operation. Further, since the common drive shaft N and the intermediate shaft 15e are provided on the base unit 3, the common drive shaft N and the intermediate shaft 15e are accommodated in a decorative cover that covers the base unit 3, and the appearance is extremely improved. It is reasonably possible to make it good.

Particularly, in this embodiment, the intermediate shaft 15e is basically provided for moving the lower end portion 6a of the rear support column 6 back and forth with the raising and lowering operation. , The front and rear supports 5, 6 pivotally supported by the drive unit 3A and the front and rear supports 5, 6 pivotally supported by the dummy unit 3B, so that a special intermediate shaft is provided. As compared with the configuration, the number of members can be more suitably reduced without any difficulty in the configuration.

Further, since all the operations of the interlocking mechanism 10 are performed by rotation and there is no slide portion, the operation can be smoothly performed, and the chair C can be made to move up and down in a well-balanced manner. Further referring to the effects specific to the present embodiment,
In the upright position, the front support 5 stands in a substantially vertical state, and the rear support 6 has a rearwardly inclined posture in a state in which the lower end 6a partially overlaps the lower end 5a of the front support 5 in a side view. It is possible to give the user a great sense of stability and a solid feeling. However, since the front and rear struts 5 and 6 are as close to or in contact with each other as possible at the lying position, there is no disadvantage that the thickness at the lying position is large. In addition, since the lower end portion 6a of the rear support 6 moves forward with the standing operation, the forward projection distance of the back 9 in the lying position can be set short, and the storage depth of the movable seat can be reduced. It also has an effect.

The front struts 5 are arranged on both sides of the seat 8, respectively, and the rear struts 6 are also integrally arranged on both sides of the back 9, so that the front and rear struts 5, 6 are provided. , Seat 8
The image of the legs supported from both sides of the camera can be given, and the user can be more strongly impressed with a sense of stability and the like. In addition, since the lid 11 that automatically closes the upper end opening of the base unit 3 at the standing position is provided, the lid 11 can hide the moving mechanism 10 and the like, thereby making the appearance favorable. It is possible to improve safety and the like by preventing hands and feet from being put in.

The present invention is not limited to the above-described embodiment, but can be variously modified. For example, the support shaft of the front support may be adopted as the intermediate shaft, and the support shafts of the front support in each base unit may be connected to each other. Further, the interlocking mechanism is not limited to the above embodiment, and the connection between the common drive shaft and the intermediate shaft is not limited to the gear train. Further, it is needless to say that the present invention can be applied to a seat other than a traveling seat.

In addition, the present invention is not limited to the illustrated example, but can be variously modified without departing from the gist thereof.

[0034]

As described in detail above, according to the present invention,
Since the common drive shafts are connected to the intermediate shafts of the drive units arranged every predetermined number, it is not necessary to arrange the gear train etc. necessary for this connection for each base unit, reducing the number of parts And simplification of assembly or low cost. In addition, since each chair operates in conjunction with the common drive shaft and the intermediate shafts in conjunction with each other to move up and down, sufficient rigidity of connection between the chairs is obtained, and a phase shift related to the raising and lowering operation is reduced, The appearance can be improved. further,
Since the common drive shaft and the intermediate shaft are provided in the base unit, the common drive shaft and the intermediate shaft are housed in the decorative cover covering the base unit, and it is impossible to make the appearance extremely good. Will be possible without.

If the intermediate shaft and the common drive shaft provided in the drive unit are connected by a gear train pivotally supported by the drive unit, the structure can be simply simplified. Instead, for example, by setting the rotation of the common drive shaft to be reduced and transmitted to the intermediate shaft, the torque acting on the common drive shaft can be reduced to reduce the torsion.

A retractable chair includes a front support having a lower end rotatably supported by the base unit in the front-rear direction, and a lower end rotatably mounted in the base unit behind the front support. A supported rear strut, an elbow member having each end pivotally attached to the upper ends of the front strut and the rear strut, and the front and rear struts are arranged in the base unit and cooperated with the elbow member. An interlocking mechanism that interlocks between the standing position and the lying position to perform a raising / lowering operation, so that the seat is supported between the adjacent front columns and the back is supported between the adjacent rear columns. Wherein the interlocking mechanism includes an intermediate shaft, first converting means for converting the rotation of the intermediate shaft into tilt of the front support, and a second converting means for converting the rotation of the intermediate shaft into tilt of the rear support.
If it is provided with the conversion means, not only can the front and rear struts give the image of the legs supported from both sides of the back seat, and not only can give the user a stronger sense of stability etc.,
The present invention can be easily configured using an intermediate shaft that forms an interlocking mechanism for interlocking these front and rear supports.

The second converting means positions the lower end portion of the rear support post at a predetermined front position in the upright position, and at a predetermined rear position set rearward from the predetermined front position in the lying position. If it is moved along with the above-mentioned raising and lowering operation, the inclination angle of the rear support at the standing position can be freely set, so that the appearance can be improved and the chair can be made more compact at the falling position.

The second converting means includes a moving arm rotatably supported by the base unit in a forward and backward direction, and a link group connecting the moving arm to an intermediate shaft and rotating in conjunction with the intermediate shaft. If the rotating end of the moving arm is pivotally connected to the lower end of the rear support, the operation of the interlocking mechanism utilizes the rotation of the members. This makes it possible to smoothly lift and lower each chair.

In order to secure a space for the lower end of the rear support to move between a predetermined front position and a predetermined rear position, an opening must be provided in the base unit. If the opening is closed by the lid at the standing position, a suitable opening can be closed. If the rear strut is arranged inside the front strut, and the front strut and the rear strut are configured to be overlapped in a side view, the chair thickness in the lying position is further reduced, and the standing position is set. Thus, the thickness of each of the struts can be made to give the user a sufficient sense of stability, solid feeling, and the like. In addition, if the front support stands upright in a substantially vertical state, and the rear support is set to be in a rearwardly inclined posture in a state where the lower end thereof partially overlaps with the lower end of the front support in a side view, it is possible to stand up. A sense of stability at the position, a solid feeling, and the like can be more strongly given to the user.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an expanded state of a movable seat in one embodiment of the present invention.

FIG. 2 is a schematic side view showing a stored state of a movable seat in the embodiment.

FIG. 3 is a schematic front view mainly showing a raising / lowering operation connection device in the embodiment.

FIG. 4 is a side view showing the internal structure of the retractable chair in the upright position in the embodiment.

FIG. 5 is a schematic perspective view mainly showing a base unit in the embodiment.

FIG. 6 is a side view showing the internal structure of the retractable chair in the upright position in the embodiment.

FIG. 7 is an operation explanatory view of the embodiment.

FIG. 8 is an operation explanatory view of the embodiment.

[Explanation of symbols]

 C: retractable chair 3: base unit 3A: drive unit 3B: dummy unit 5: front support 5a: lower end of front support 5b: upper end of front support 6: rear support 6a: lower end of rear support 6b: rear support 7 ... elbow member 8 ... seat 9 ... back 10 ... interlocking mechanism 11 ... lid 12 ... moving arm 12a ... rotating end of moving arm 15e ... intermediate shaft 101 ... first conversion means 102 ... second Conversion means N: common drive shaft G: gear train

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04H 3/12 A47C 1/12-1/126

Claims (8)

(57) [Claims] 1. A plurality of retractable chairs are supported on a base unit arranged in a row on a floor, and the retractable chairs are moved to a standing position by utilizing the rotation of a common drive shaft penetrated through these base units. It is configured to be able to be raised and lowered at the same time between the lying position, and each base unit is provided with an intermediate shaft that rotates in conjunction with the raising and lowering operation of the retractable chair, and these intermediate shafts are connected to each other. The retractable chair is connected to a common drive shaft.
The intermediary shafts are linked so that they can move up and down
In addition , a series of base units are composed of a drive unit in which an intermediate shaft is connected to the common drive shaft, and a dummy unit in which the intermediate shaft is not connected to the common drive shaft. One or more dummy units are provided, and the retractable chair raising / lowering operation connection device is characterized in that it is provided. 2. The retractable chair according to claim 1, wherein an intermediate shaft provided in the drive unit is connected to the common drive shaft via a gear train pivotally supported by the drive unit. Coupling device. 3. A plurality of base units arranged on a floor surface.
While supporting the retractable chair, these base units
Using the rotation of the common drive shaft
Simultaneously raise and lower the chair between the standing position and the lying position
And each base unit is linked to the raising and lowering operation of the retractable chair.
And an intermediate shaft that rotates
And a series of base units connected to the common drive shaft with an intermediate shaft.
Connected drive unit and an intermediate shaft connected to the common drive shaft.
With dummy units that are not connected
And one or more dummy units between the drive units.
A retractable chair, a front support having a lower end supported rotatably in the front-rear direction by the base unit, and each base unit disposed behind the front support. A rear strut whose lower end is supported rotatably in the front-rear direction, an elbow member each end of which is pivotally attached to an upper end of a front strut and a rear strut, and which is disposed in the base unit, An interlocking mechanism for interlocking the front and rear struts between a standing position and a falling position by cooperating with an elbow member to raise and lower the front and rear struts. The interlocking mechanism includes an intermediate shaft, first conversion means for converting rotation of the intermediate shaft into tilting of the front support, and rotation of the intermediate shaft. Retractable chair comprising a second conversion means for converting the tilt into the tilt of the rear support. Up and down motion connecting device. 4. A second conversion means for positioning the lower end of the rear support at a predetermined front position in the upright position and at a predetermined rear position behind the predetermined front position in the lying position. 4. The connecting device for raising and lowering a retractable chair according to claim 3, wherein the device is moved in accordance with the raising and lowering operation. 5. A moving arm supported by a base unit so as to be able to rotate back and forth, and a link group for connecting the moving arm to an intermediate shaft and rotating in conjunction with the intermediate shaft. 5. The apparatus according to claim 4, wherein the pivoting end of the moving arm is pivotally connected to the lower end of the rear support. 6. A lid is formed on the moving arm, and the lid is provided on the base unit to secure a space for moving the lower end of the rear support between a predetermined front position and a predetermined rear position. The retractable chair according to claim 5, wherein the opening is configured to be closed in the upright position. 7. The retractable chair according to claim 3, wherein a rear support is disposed inside the front support, and the front support and the rear support can be overlapped in a side view. 8. In the upright position, the front column is set up in a substantially vertical state, and the rear column is set in a rearwardly inclined position with its lower end partially overlapping the lower end of the front column in a side view. The retractable chair according to claim 3, 4, 5, 6, or 7.