JP5843557B2 - Storage type bleachers - Google Patents

Description

  The present invention relates to a retractable bleacher with a folding handrail that can be stored when not in use and can be folded by a driving force transmitted from a driving unit.

  Conventionally, a telescopic staircase that can fold an automatic folding handrail by a driving force of a motor has been known (Patent Document 1). In this bleacher seat, a box containing an automatic folding mechanism for handrails is placed on the outer side of the stairway of the telescopic staircase. Moreover, the box is arrange | positioned in the position pinched | interposed into the lower end part of a handrail. A motor with a speed reducer having a concentrically projecting output shaft symmetrically in a horizontal state is disposed almost at the center in the box.

  An input shaft having a first link fitted to one end of the shaft portion is rotatably disposed in a manner parallel to the output shaft at a position directly below the output shaft of the motor. A gear that meshes with a gear fitted to the output shaft is fitted on the shaft of the input shaft. The second link is swingably connected to the tip of the first link. The distal end portion of the second link is connected to a driven pin protruding from the upper end of the lower end portion of the handrail. When the seat is stored, the first link is rotated around the input shaft by the driving force of the motor, and the handrail in the upright state is automatically tilted in the horizontal direction. When using the bleachers, the handrail is automatically erected from the folding position in the upright direction by the reverse driving force of the motor and the reverse operation of each main part.

Japanese Utility Model Publication No. 60-150265

  The motor for the automatic folding handrail needs to include a speed reducer, and also needs to include a lock mechanism for preventing the handrail from falling when the bleacher seat is used. For this reason, the size of the motor is increased, and the positions where the motor can be disposed are limited. Specifically, in Patent Document 1, the motor is housed in a box arranged at a position on the outer side of the stairway and sandwiched between the lower ends of the handrails. When the motor is arranged at such a position, the space of the passage or the space where the chair can be arranged becomes narrow. And if it is going to expand a space, the size of the whole bleachers and the accommodation of a bleachers will become large.

  In order to solve the above problems, a retractable bleacher of the present invention is arranged on a plurality of floors that are movable between an unfolded position and a stowed position, and the floor is placed in the unfolded position. A chair that stands up when moving to the storage position and falls down when the floor base moves to the storage position and at least one floor base of the plurality of floor bases, and the floor base moves to the unfolded position A folding handrail that rises when the floor is moved to the storage position, a shaft connected to the folding handrail, a motor that generates a driving force for rotating the shaft, and the motor And a drive unit having a worm gear connected to the shaft.

  Thereby, the size of the drive unit can be reduced. Therefore, the space of a passage or the space where a chair can be arranged can be widened, or the size of the entire storage type audience seat can be reduced. Moreover, the freedom degree of the position which arrange | positions a drive part can be raised.

  Further features of the present invention will become apparent from the following description of embodiments, given by way of example with reference to the accompanying drawings.

It is a schematic side view which shows the state in which a retractable bleacher is in a deployment position. It is a schematic side view which shows the state in which a storage type seat is in a storage position. It is the schematic explaining a mode that a chair is rock | fluctuated. It is a schematic front view which shows the folding handrail which stood up. It is a schematic front view which shows the folded folding handrail. It is a schematic three-view figure which shows the base of a folding handrail. It is a schematic side view which shows the drive part arrange | positioned behind the penetrating material. It is a schematic plan view which shows the drive part arrange | positioned behind the penetrating material. It is a schematic side view which shows the drive part arrange | positioned ahead of the penetrating material. It is a schematic plan view which shows the drive part arrange | positioned ahead of the penetrating material. It is a schematic three-plane figure which shows the fixing member of a drive part. It is a schematic plan view which shows the storage type bleacher of 2nd Embodiment. It is a schematic side view which shows the storage type bleacher of 2nd Embodiment.

  Hereinafter, exemplary embodiments for carrying out the present invention will be described in detail with reference to the drawings. However, dimensions, materials, shapes, relative positions of components, and the like described in the following embodiments are arbitrary and can be changed according to the configuration of the apparatus to which the present invention is applied or various conditions. Unless otherwise specified, the scope of the present invention is not limited to the embodiments specifically described in the examples described below.

[First Embodiment]
The retractable seat 1 can be moved between the unfolded position shown in FIG. 1 and the stowed position shown in FIG. The retractable bleacher 1 is placed on the floor 2 and a plurality of floors 2 that are movable between the deployed position and the stowed position, and stands up when the floor 2 moves to the deployed position. And a chair 3 that falls when the floor 2 moves to the storage position. Then, when the deployment position direction is the front and the storage position direction is the rear, when the retractable seat 1 is used, it is sequentially pulled out from the floor 2 at the lowest level. Thereby, the multi-stage floor base 2 that has moved to the unfolded position has a step-like form in which the height increases stepwise toward the rear. That is, the lowermost floor pedestal 2 is located in the front row, and the uppermost floor pedestal 2 is located in the last row. A user of the retractable seat 1 sits on a plurality of chairs 3 arranged on each floor base 2 in the unfolded position.

  When the stowable spectator seat 1 is stored, it is moved backward from the foremost floor 2 so as to overlap the rear floor 2 in sequence. As a result, the storage type viewing seat 1 can be stored in the storage 10 in a state where the plurality of floor bases 2 overlap below the uppermost floor base 2. A penetrating material 22 extends in the extending direction of each floor base 2, that is, in the same direction as the longitudinal direction of the floor base 2. Each floor base 2 is supported by a beam member 21, and the beam member 21 is fixed to a penetrating member 22. The penetrating material 22 is supported by a support member 23 on the base 11 having a traveling roller. The chair 3 is disposed in front of the penetrating material 22. That is, each floor base 2 on which the chair 3 is arranged is supported in a cantilever state by the beam member 21, the penetrating member 22 and the support member 23. The base 11 can be moved forward and backward by a motor (not shown). In the first embodiment, a stairway is provided at a predetermined position. And the step not shown is arrange | positioned at the said stairway so that it may be pinched | interposed into the chair 3 and the chair 3. FIG.

  A plurality of chairs 3 are arranged side by side on each floor base 2, and adjacent chairs 3 are connected to each other. And as shown in FIG. 3, the chair 3 has the seat 31 for a user to sit down, the back 32 provided in the back of the seat 31, and the armrest 33 provided in the both sides of the seat 31. . The seat 31 is configured to be swingable between a use position where a user can sit and a raised position where the user jumps up. In FIG. 3, the seat 31 in the standing position is indicated by a dotted line. Further, the chair 3 can swing between a position where the chair 3 stands up and a position where the chair 3 falls down. The drive mechanism 200 has a transmission mechanism that transmits a driving force of a motor (not shown) to the chair 3. Then, when the floor 2 moves to the storage position, the drive mechanism 200 tilts the chair 3 to the storage position indicated by the solid line in FIG. On the other hand, when the floor 2 moves to the deployed position, the drive mechanism 200 raises the chair 3 at the deployed position indicated by the dotted line in FIG.

  A folding handrail 4 is disposed on at least one floor base 2 of the multi-stage floor base 2 so as to stand when the floor base 2 moves to the unfolded position and to fall down when the floor base 2 moves to the storage position. Yes. The folding handrail 4 also serves as a safety fence and is disposed on both side ends of the floor 2. The folding handrail 4 arranged on each floor base 2 stands as shown in FIG. 4 when the floor base 2 is in the unfolded position. The folding handrail 4 standing up in this way abuts against the ceiling of the storage case 10 when the storage type viewing seat 1 is stored and obstructs storage. Therefore, the folding handrail 4 can be swung between a standing position and a collapsed position around the shaft 5 connected to the folding handrail 4. When the floor 2 is in the storage position, it is folded as shown in FIG. 4 and 5, the penetrating material 22 is indicated by a dotted line.

  The leg member 41 of the folding handrail 4 is fixed to the shaft 5 via a plate-shaped connection fitting 51 which is a connection member. The end of the connection fitting 51 is welded to the lower end of each leg member 41 of the folding handrail 4. In addition, a hole through which the shaft 5 passes is formed in the connection fitting 51, and the connection fitting 51 is welded to the shaft 5 passing through the hole. Further, the shaft 5 is supported by a base 52 disposed below the folding handrail 4. In the base 52, a hole through which the shaft 5 passes is formed as a bearing 520. Thus, when the shaft 5 is rotated by a driving force of a motor 61 described later, the folded handrail 4 can be swung around the shaft 5. A plate member 411 is welded to the leg member 41. And the base 52 has the contact part 53 with which the lower part of the leg member 41 contact | abuts. The contact portion 53 includes an L-shaped metal fitting 531 welded to the inner surface of the base 52, and a bolt 532 attached to the metal fitting 531. When the folded handrail 4 stands up, the head of the bolt 532 comes into contact with the plate member 411. Note that the base 52 is fixed to the floor 2 with bolts, and the connection fitting 51 is located inside the base 52.

  6 shows the base 52 viewed from three directions, the left part of FIG. 6 shows the base 52 seen from the front, and the upper right part of FIG. 6 shows the base 52 seen from above. A base 52 viewed from the side is shown in the lower right portion of 6. The base 52 is welded to a first portion 521 having a substantially L-shape when viewed from the front and a second portion 522 having a substantially U-shape when viewed from the side. Is formed by. Accordingly, an inner wall portion 523 that extends in the front-rear direction and rises upward is provided at the center portion of the base 52, and an outer wall portion 524 that rises upward is provided at the front end and the rear end of the base 52. Yes. A bearing 520 of the shaft 5 is formed on the outer wall 524. In the vicinity of each outer wall portion 524 and inside the base 52, a contact portion 53 with which the leg member 41 of the folded handrail 4 abuts is disposed. In addition, two bolt holes 525 for fixing the base 52 to the floor base 2 are formed in the first portion 521 and the second portion 522. That is, the base 52 is fixed to the floor base 2 with bolts through four bolt holes 525.

  As shown in FIG. 7, the folding handrail 4 includes two leg members 41 configured by square pipes extending in the vertical direction and an upper member 42 configured by square pipes extending in the horizontal direction. . And the both ends of the front-back direction of the upper member 42 are welded to the upper end part of each leg member 41, respectively. A frame member 44 having a substantially U-shaped cross section and extending in the horizontal direction is disposed below the upper member 42. Then, both end portions in the front-rear direction of the frame member 44 are welded to the leg members 41, respectively. The upper end portion of the plate-like panel 45 is inserted into the groove portion of the frame member 44, and the lower end portion of the panel 45 is screwed. The panel 45 is formed of a composite plate of an aluminum layer and a resin layer. An opening is provided between the panel 45 and the upper member 42. And the lower end part of each leg member 41 is arrange | positioned inside the base 52. As shown in FIG. That is, the connection fitting 51 is located inside the outer wall portion 524 of the base 52, and the lower end portion of each leg member 41 is located inside the connection fitting 51. In FIG. 7, two of the plurality of floors 2 are illustrated, and the chair 3 is illustrated by a dotted line for convenience of explanation.

  Further, as shown in FIGS. 7 and 8, the drive unit 6 is disposed behind the penetrating member 22. The drive unit 6 includes a motor 61 that generates a driving force for rotating the shaft 5, and a worm gear 62 connected to the motor 61 and the shaft 5. The motor 61 and the worm gear 62 are positioned side by side, and the motor 61 is positioned inside the worm gear 62. The worm gear 62 includes a gear-shaped worm wheel 621 and a screw-shaped worm 622 that meshes with the worm wheel 621. The worm 622 is connected to the output shaft of the motor 61, and the worm wheel 621 is fixed to the shaft 5. More specifically, the worm wheel 621 is fixed to the rear end of the shaft 5, and the worm 622 is connected to the output shaft of the motor 61 via the coupling 63. The worm wheel 621 is disposed above the worm 622.

  When the worm 622 rotates around the output shaft by the driving force of the motor 61, the worm wheel 621 that meshes with the worm rotates around the shaft 5. When the shaft 5 rotates with the rotation of the worm wheel 621, the leg member 41 connected to the shaft 5 via the connection fitting 51 swings around the shaft 5. Thereby, the folding handrail 4 swings around the shaft 5 by the driving force of the motor 61. In this way, when the retractable bleacher 1 is stored, the folding handrail 4 is tilted by the driving force of the motor 61. On the other hand, when the retractable bleacher 1 is unfolded, the motor 61 is reversed to raise the folding handrail 4. In FIG. 8, the chair 3 is shown by a dotted line for convenience of explanation.

  According to such a drive part 6, since a high reduction ratio is obtained, it is not necessary to provide a separate reduction gear in the drive part 6. Furthermore, since the worm gear 62 has a self-locking function, the worm wheel 621 can be prevented from rotating the worm 622 even if a force is applied to the folding handrail 4 with the motor 61 stopped. Thereby, since it is not necessary to provide the drive part 6 with a separate locking mechanism, the size of the drive part 6 can be reduced. Moreover, since it is not necessary to provide a separate speed reducer and lock mechanism, the manufacturing cost can be reduced.

  The motor 61 and the worm gear 62 are arranged behind the penetrating member 22 in a direction parallel to the longitudinal direction of the penetrating member 22. Further, the motor 61 is screwed to a fixing bracket 64 which is a fixing member having a substantially 9-shaped cross section. The fixing fitting 64 is fixed to the penetrating member 22 by two bolts 640 arranged in the vertical direction. Further, a front space 71 in which the drive unit 6 can be arranged is provided in front of the penetrating material 22 as shown by a one-dot chain line in FIGS. 7 and 8. That is, the length from the penetrating material 22 to the base 52 of the folding handrail 4 in the front-rear direction is longer than the width of the drive unit 6. The length from the floor 2 to the chair 3 in the vertical direction is longer than the height of the drive unit 6. Therefore, it is possible to dispose the drive unit 6 behind the penetrating member 22 or to dispose the driving unit 6 in front of the penetrating member 22. In other words, a front space 71 in which the driving unit 6 can be disposed in front of the penetrating member 22 is provided, and a rear space 72 in which the driving unit 6 can be disposed in the rear of the penetrating member 22 is provided. ing. Thereby, the freedom degree of design of the retractable bleacher 1 can be raised. In addition, when arrange | positioning the drive part 6 ahead of the penetrating material 22, compared with the shaft 5 at the time of arrange | positioning the drive part 6 behind the penetrating material 22, the shaft 5 of short length can be used. .

  9 and 10 show an example in which the drive unit 6 is arranged in front of the penetrating material 22. A rear space 72 in which the drive unit 6 can be disposed is provided behind the penetrating member 22. As described above, the motor 61 is screwed to the fixing bracket 64, and the fixing bracket 64 is fixed to the penetrating member 22 by the two bolts 640 arranged in the vertical direction. A rear space 72 in which the drive unit 6 can be disposed is provided behind the penetrating member 22 at the rear portion of the floor base 2 as shown by a one-dot chain line in FIGS. 9 and 10. With such a configuration, it is possible to increase the degree of freedom in designing the retractable bleacher 1. In particular, when the drive unit 6 is disposed behind the penetrating member 22, the drive unit 6 can be easily serviced or inspected from the rear of the floor 2. In FIG. 9, some of the plurality of floors 2 are illustrated. Moreover, in FIG.9 and FIG.10, the chair 3 is illustrated with the dotted line for the convenience of description.

  In the first embodiment, the same fixing bracket 64 can be used when the drive unit 6 is arranged behind the penetrating member 22 and when the drive unit 6 is arranged ahead of the penetrating member 22. FIG. 11 shows the fixing bracket 64 viewed from three directions. The left portion of FIG. 11 shows the fixing bracket 64 viewed from the front, and the upper right portion of FIG. 11 shows the fixing bracket 64 viewed from above. In the lower right part of FIG. 11, a fixing metal 64 viewed from the side is shown. The fixture 64 defines an inner space 65 in which the coupling 63 is disposed and an outer space 66 in which the worm gear 62 is disposed. The inner space 65 is defined by a first wall portion 641, a second wall portion 642, a third wall portion 643, and a fourth wall portion 644 that surround the coupling 63 from four directions, and the outer space 66 contains the worm gear 62. It is defined by a fourth wall portion 644, a fifth wall portion 645 and a sixth wall portion 646 that surround from three directions. The fourth wall portion 644 that divides the inner space 65 and the outer space 66, that is, the fourth wall portion 644 facing the coupling 63 and the worm gear 62 is shared by the inner space 65 and the outer space 66.

  The first wall portion 641 is formed with a bolt hole 650 that is used to fix the fixing bracket 64 when the driving unit 6 is disposed behind the penetrating member 22. Further, the second wall portion 642 is opposed to the first wall portion 641 and is formed with a bolt hole 650 used for fixing the fixing metal fitting 64 when the driving unit 6 is disposed in front of the penetrating member 22. Has been. Further, the third wall portion 643 faces the motor box and is formed with a hole 651 through which the coupling 63 passes. The fourth wall portion 644 is disposed between the coupling 63 and the worm gear 62, and has a hole 652 through which the worm 622 passes. Further, the fifth wall portion 645 is opposed to the fourth wall portion 644, and is formed with a hole 653 through which the worm 622 passes. A hole 654 through which the shaft 5 passes is formed in the sixth wall portion 646.

  Thereby, the same fixing | fixed metal fitting 64 can be used by the case where the drive part 6 is arrange | positioned behind the penetrating material 22, and the case where the drive part 6 is arrange | positioned ahead of the penetrating material 22. FIG. That is, when the drive unit 6 is disposed behind the penetrating member 22, the fixing metal fitting 64 is fixed to the rear surface of the penetrating member 22 using the bolt hole 650 formed in the first wall portion 641. When the driving unit 6 is disposed in front of the penetrating member 22, the fixing metal fitting 64 is fixed to the front surface of the penetrating member 22 using the bolt hole 650 formed in the second wall portion 642. Therefore, it is not necessary to prepare two types of fixing brackets 64, and the number of parts can be reduced. Such a fixture 64 can be removed by removing the bolt from the penetrating member 22. That is, the fixing bracket 64 can be attached to and detached from both the front surface and the rear surface of the penetrating material 22. Thereby, the fixing bracket 64 fixed to the rear surface of the penetrating member 22 can be removed and attached to the front surface of the penetrating member 22 to be fixed.

  The penetrating member 22 has through holes that penetrate from the rear to the front at positions corresponding to the bolt holes 650 formed in the first wall portion 641 and the bolt holes 650 formed in the second wall portion 642. doing. The fixing fitting 64 is fixed to the penetrating member 22 with a bolt that penetrates the through hole. Thereby, even when the fixing metal fitting 64 is arranged behind the penetrating member 22 or when the fixing metal fitting 64 is arranged in front of the penetrating member 22, the fixing metal fitting 64 is fixed to the penetrating member 22. Can do.

  According to the first embodiment described above, the size of the drive unit 6 can be reduced. Therefore, the space of the passage or the space where the chair 3 can be arranged can be widened, or the size of the entire storage type viewing seat 1 can be reduced. Furthermore, it is possible to arrange the drive unit 6 behind the penetrating material 22 or to arrange the driving unit 6 ahead of the penetrating material 22. Therefore, the degree of freedom in designing the retractable bleacher 1 can be increased.

[Second Embodiment]
In the second embodiment, the motor for generating the driving force transmitted to the driving mechanism 200 of the chair 3 is also used as the motor for generating the driving force transmitted to the folding handrail 4 in the first embodiment. Is different. Further, the position of the stairway is different between the second embodiment and the first embodiment. Hereinafter, the second embodiment will be described with reference to FIGS. 12 and 13, and the same reference numerals are given to the same configurations as those in the first embodiment, and the description thereof will be omitted. In FIG. 13, the chair 3 is not shown for convenience of explanation.

  The retractable bleacher 1 according to the second embodiment includes a drive mechanism 200 that raises the chair 3 when the floor 2 moves to the unfolded position, and drives the chair 3 down when the floor 2 moves to the retracted position. A mechanism 200 and a transmission shaft 202 connected to the output shaft of the motor 61 are included. The drive mechanism 200 is connected to the output shaft of the motor 61 that swings the folding handrail 4 via the transmission unit 210. More specifically, the drive gear 201 is fixed to the output shaft of the motor 61 of the drive unit 6, and the driven gear 203 meshed with the drive gear 201 is fixed to the transmission shaft 202 arranged on the floor 2. ing. Further, the transmission shaft 202 extends in the arrangement direction of the plurality of chairs 3. The drive mechanism 200 has a transmission mechanism (not shown) that transmits the rotation of the transmission shaft 202 to the chair 3. For example, the transmission mechanism includes a gear and a link mechanism fixed to the transmission shaft 202, and the drive mechanism 200 is provided between a position where the plurality of chairs 3 are raised and a position where the chair 3 is tilted according to the rotation of the gear and the link mechanism. Can be swung.

  The output shaft of the motor 61 is connected to the worm gear 62 via the transmission shaft 202. That is, the worm 622 of the worm gear 62 is connected to the end of the transmission shaft 202 via the coupling 63. A worm wheel 621 of the worm gear 62 is arranged above the worm 622 so as to mesh with the worm 622. The worm wheel 621 is fixed to the rear end of the shaft 5, and the shaft 5 is connected to the leg member 41 of the folding handrail 4 via the connection fitting 51. Thereby, the chair 3 and the folding handrail 4 stand up with the rotation of the transmission shaft 202 when the floor 2 moves to the unfolded position. And the chair 3 and the folding handrail 4 fall down with the rotation of the transmission shaft 202 when the floor 2 moves to the storage position.

  The worm gear 62 is fixed to the penetrating member 22 via a fixing fitting 264. The fixing fitting 264 has a pair of wall portions in which holes through which the worm 622 passes are formed, and a wall portion in which holes through which the shaft 5 passes are formed. The fixing bracket 264 is configured to surround the side and rear of the worm gear 62. Further, a step 220 indicated by a dotted line is arranged between the chair 3 located on the leftmost side in FIG. 12 and the folding handrail 4. That is, a step 220 having a height lower than that of the chair 3 is arranged outside the chair 3 arranged on the outermost side on the floor 2. As a result, the step 220 is positioned at a position overlapping the folded folding handrail 4. And as shown in FIG. 13, the height of step 220 is set so as not to disturb the swinging of the folding handrail 4. Therefore, even if the chair 3 and the folding handrail 4 stand up or fall almost simultaneously by the driving force of the motor 61, the swinging of the folding handrail 4 is not hindered.

  According to the retractable bleacher 1 of the second embodiment, it is not necessary to provide the chair driving motor 61 in addition to the same effects as the first embodiment. Therefore, the space of the passage or the space where the chair 3 can be arranged can be made wider. Alternatively, the size of the entire storage type viewing seat 1 can be further reduced.

  In each of the above embodiments, the shaft 5 is located on the side of the penetrating member 22. However, the shaft 5 may penetrate the penetrating member 22 by forming a penetrating portion in the penetrating member 22. Further, in the first embodiment, the folding handrail 4 is disposed on all of the plurality of floor bases 2. However, the folding handrail 4 only needs to be disposed on at least one of the plurality of floors 2. That is, among the plurality of floor bases 2, only the handrails that prevent storage, that is, the handrails of the floor base 2 at a high position can be used as the folding handrails 4, and the handrails of the floor base 2 at the low positions can be made unfoldable. . In each of the above embodiments, the beam member 21 is fixed to the penetrating member 22. However, the beam member 21 can be fixed to the support member 23.

  While the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Inventions modified within the scope not departing from the present invention and inventions equivalent to the present invention are also included in the present invention. Moreover, each above-mentioned embodiment and modification can be combined suitably in the range which is not contrary to this invention.

  1: storage type bleachers, 2: floor base, 3: chair, 4: folding handrail, 5: shaft, 6: drive unit, 10: storage, 11: base, 21: beam material, 22: penetrating material, 23: support member, 31: seat, 32: back, 33: armrest, 41: leg member, 411: plate member, 42: upper member, 44: frame member, 45: panel, 51: connection fitting, 52: base 53: contact part 61: motor 62: worm gear 63: coupling 64: fixing bracket 65: inner space 66: outer space 71: front space 72: rear space 200: drive mechanism 201: Drive gear, 202: Transmission shaft, 203: Driven gear, 210: Transmission portion, 220: Step, 264: Fixing bracket, 520: Bearing, 521: First part, 522: Second part, 523: Inner wall Part, 524: outer wall part, 525: bolt hole 531: Metal fitting, 532: Bolt, 640: Bolt, 621: Worm wheel, 622: Worm, 641: First wall portion, 642: Second wall portion, 643: Third wall portion, 644: Fourth Wall portion, 645: fifth wall portion, 646: sixth wall portion, 650: bolt hole, 651: hole portion, 652: hole portion, 653: hole portion, 654: hole portion

Claims (5)

A multi-stage floor base movable between an unfolding position and a storage position;
A chair that is disposed on the floor pedestal, stands up when the floor pedestal moves to the deployed position, and collapses when the floor pedestal moves to the storage position;
A folding handrail that is disposed on at least one of the plurality of floors, rises when the floor moves to the unfolded position, and collapses when the floor moves to the storage position;
A shaft connected to the folding handrail;
A drive unit having a motor for generating a driving force for rotating the shaft, and a worm gear connected to the motor and the shaft ;
Comprising a penetrating material extending in the same direction as the floor,
The chair is disposed in front of the penetrating material, and the driving unit is disposed in the rear of the penetrating material . The worm of the worm gear is connected to the output shaft of the motor,
The worm wheel of the worm gear is fixed to the shaft,
The folding handrail is fixed to the shaft via a connecting member,
When the worm rotates by the driving force of the motor, the worm wheel meshing with the worm rotates around the shaft,
The retractable bleacher according to claim 1, wherein when the shaft rotates with the rotation of the worm wheel, the folding handrail swings around the shaft. A multi-stage floor base movable between an unfolding position and a storage position;
A chair that is disposed on the floor pedestal, stands up when the floor pedestal moves to the deployed position, and collapses when the floor pedestal moves to the storage position;
A folding handrail that is disposed on at least one of the plurality of floors, rises when the floor moves to the unfolded position, and collapses when the floor moves to the storage position;
A shaft connected to the folding handrail;
A drive for rotating the shaft;
Comprising a penetrating material extending in the same direction as the floor,
The chair is disposed in front of the penetrating material,
In the front and rear of the penetrating material, there is provided a space in which the driving unit can be disposed,
The drive unit, the front and rear surfaces of the beam member via the fixing member detachable, features and to that retract and type bleachers that are fixed to the beam member. The fixing member has a first wall portion and a second wall portion facing each other,
Bolt holes are formed in the first wall portion and the second wall portion,
The storage type bleacher according to claim 3 , wherein the fixing member is fixed to the penetrating material through a bolt inserted into the bolt hole. A multi-stage floor base movable between an unfolding position and a storage position;
A chair that is disposed on the floor pedestal, stands up when the floor pedestal moves to the deployed position, and collapses when the floor pedestal moves to the storage position;
A folding handrail that is disposed on at least one of the plurality of floors, rises when the floor moves to the unfolded position, and collapses when the floor moves to the storage position;
A shaft connected to the folding handrail;
A drive unit having a motor for generating a driving force for rotating the shaft, and a worm gear connected to the motor and the shaft;
A drive mechanism that raises the chair when the floor pedestal moves to the unfolded position and tilts the chair when the floor pedestal moves to the storage position;
A transmission shaft connected to the drive mechanism and the output shaft of the motor;
The output shaft of the motor is connected to the worm gear via the transmission shaft,
The chair and the folding handrail stand with the rotation of the transmission shaft when the floor base moves to the unfolded position, and fall down with the rotation of the transmission shaft when the floor base moves to the storage position. Osamu pay formula bleachers you, characterized in that.