JP6893869B2 - Undulating gate - Google Patents

Description

The present application relates to undulating gates.

Conventionally, flap gates for preventing flooding and tsunami inundation have been known. For example, the floating flap gate disclosed in Patent Document 1 includes a door body that stands up by the buoyancy of water when flooded. Further, the floating flap gate is provided with a counterweight that assists the standing operation of the door body. That is, a wire rope having a counterweight connected to the end portion is attached to the tip end portion of the door body via a pulley. A pulling force by the counterweight acts on the door body in the collapsed state, and this pulling force assists the standing operation of the door body.

Japanese Unexamined Patent Publication No. 2015-180806

By the way, in the undulating gate provided with the auxiliary drive unit as described above, the installation space of the auxiliary drive unit is required to some extent, especially in a place where the upper region and the downstream region of the door body are limited. Was sometimes difficult.

Therefore, it is conceivable to provide a mechanism for pushing up the door body below the door body in the collapsed state to assist the standing operation of the door body. That is, as an auxiliary drive unit, a telescopic drive shaft whose base end is fixed to the door body and whose tip is in contact with the ground, and a thrust applying unit that applies thrust to the drive shaft to extend the drive shaft are provided. The extension of the drive shaft pushes up the door body and assists the standing operation of the door body. However, in this auxiliary drive unit, the drive shaft tilts with respect to the ground as the door body stands up, so that the tip of the drive shaft comes into contact with the ground. Therefore, the reaction force from the ground acts at a position deviated from the axis of the drive shaft. That is, the reaction force from the ground acts as an eccentric load on the drive shaft. This may impair the smooth extension operation of the drive shaft.

The technique disclosed in the present application has been made in view of such circumstances, and the purpose is to smoothly push up the auxiliary drive unit in an undulating gate provided with an auxiliary drive unit that pushes up the door body from below to assist the standing operation. To make it work.

The undulating gate of the present application includes a door body and an auxiliary drive unit. The door body has a rotation shaft, and rotates around the rotation shaft to stand up. The auxiliary drive unit is provided between the door body in the collapsed state and the ground, and assists the standing operation of the door body. The auxiliary drive unit includes a drive shaft, a thrust applying unit, and a receiving unit. The drive shaft is rotatably attached with its base end rotatably centered on a rotation center extending in the same direction as the rotation shaft at one of the door body and the ground, and the tip thereof is attached to the other door body or the ground. It extends toward and expands and contracts in the axial direction. The thrust applying unit extends the driving shaft by applying thrust to the driving shaft and pushes up the door body. The receiving portion is provided on the door body or the ground on which the tip of the drive shaft extends toward, and the tip of the drive shaft is slidably contacted.

According to the undulating gate of the present application, the auxiliary drive unit can be operated smoothly.

FIG. 1 is a view showing a schematic configuration of an undulating gate according to an embodiment when it is laid down, as viewed from the side surface side. FIG. 2 is a diagram showing a schematic configuration of the undulating gate according to the embodiment when it is laid down, as viewed from the upstream side. FIG. 3 is a diagram showing a state of the auxiliary drive unit according to the embodiment at the time of lodging. FIG. 4 is a diagram showing a state of the auxiliary drive unit according to the embodiment during standing up. FIG. 5 is a diagram showing a state in which the drive shaft is separated from the receiving portion for the auxiliary drive portion according to the embodiment. FIG. 6 is a view corresponding to FIG. 3 of the auxiliary drive unit according to the first modification of the embodiment. FIG. 7 is a view corresponding to FIG. 3 of the auxiliary drive unit according to the second modification of the embodiment. FIG. 8 is a view corresponding to FIG. 3 of the auxiliary drive unit according to the third modification of the embodiment.

Hereinafter, embodiments of the present application will be described with reference to the drawings. It should be noted that the following embodiments are essentially preferred examples and are not intended to limit the scope of the techniques disclosed in the present application, their applications, or their uses.

The undulating gate 1 of the present embodiment is installed on the road surface Ra (land) to prevent water from entering the living space or the underground space due to flood, tsunami, or heavy rain. The undulating gate 1 is a floating undulating gate (sometimes also referred to as a floating flap gate) that automatically performs an upright operation and an undulating operation by using water to enter. As shown in FIGS. 1 and 2, the undulating gate 1 includes a door body 10, a door stop 16, a storage unit 17, and an auxiliary drive unit 20.

The door body 10 is formed in a substantially rectangular shape. The door body 10 has a rotation shaft 11 on the base end side, and is rotatably provided around the rotation shaft 11. As shown by an arrow in FIG. 1, the door body 10 rotates clockwise to perform an upright operation, and rotates counterclockwise to perform a lodging operation. The door body 10 is normally in a laid-down state (the state shown by the solid line in FIG. 1), and in an emergency (that is, when water has infiltrated), it rotates from the laid-down state due to the buoyancy of the infiltrated water. It is configured to be in an upright state (the state shown by the alternate long and short dash line in FIG. 1). That is, the door body 10 starts the standing operation by utilizing the infiltrated water.

In addition, in FIG. 1, it is assumed that water infiltrates from the left side. Further, the "upstream side" and "downstream side" described below are intended to be the upstream side (left side in FIG. 1) and the downstream side (right side in FIG. 1) in the water intrusion direction.

In the inverted state, the door body 10 has an upper surface portion 12 on the upper side, a lower surface portion 13 on the lower side, and side surface portions 14 on the left side and the right side when viewed from the upstream side. The door stop 16 is provided on the left side and the right side of the door body 10 when viewed from the upstream side. A watertight rubber (not shown) is attached to a side surface portion 14 of the door body 10 which is a portion facing the door stop 16, and the door body 10 is watertight when the watertight rubber comes into contact with the door stop 16.

The storage unit 17 stores the door body 10 when it falls down. The storage portion 17 is a recess formed in the road surface Ra, and is formed in a rectangular shape larger than the door body 10 in a plan view. When the door body 10 is stored in the storage portion 17, that is, when the door body 10 is laid down, the lower surface portion 13 of the door body 10 and the ground Rb (bottom surface of the storage portion 17) are substantially flush with each other. Normally, a vehicle or a person passing through the road surface Ra will pass through the upper surface portion 12 of the door body 10. That is, the door body 10 in the collapsed state constitutes a part of the road surface Ra.

The auxiliary drive unit 20 is provided between the door body 10 in the collapsed state and the ground Rb, and assists the standing operation of the door body 10. Auxiliary drive units 20 are provided one by one at positions corresponding to both ends in the width direction (left-right direction in FIG. 2) of the door body 10. Further, the auxiliary drive unit 20 is provided substantially at the center in the upstream and downstream directions of the door body 10 (see FIG. 1). As shown in FIG. 3, the auxiliary drive unit 20 includes a case 21, a rotating shaft 22, a drive shaft 23, a coil spring 26, a receiving unit 27, and a stopper 29.

The case 21 is formed in a substantially rectangular container shape, and is provided inside the door body 10. The rotating shaft 22 extends in parallel with the rotating shaft 11, and both ends thereof are fixed to a girder member (not shown) constituting the door body 10. A rotating shaft 22 is inserted through the case 21, and the case 21 is rotatably provided around the rotating shaft 22. That is, the central axis of the rotating shaft 22 is the rotating center Qa of the case 21. The rotation center Qa extends in the same direction as the rotation shaft 11, and the case 21 is rotatably provided around the rotation center Qa.

The drive shaft 23 is configured to be expandable and contractible in the axial direction. The base end (door body 10 side) of the drive shaft 23 is inserted into the case 21 and is configured to rotate integrally with the case 21. That is, the base end of the drive shaft 23 is rotatably attached to the door body 10 about the rotation center Qa. The drive shaft 23 is provided with a convex arc surface 25 at the tip 24 of the drive shaft 23 whose tip 24 extends toward the ground Rb.

The drive shaft 23 is inserted into the coil spring 26, and constitutes a thrust applying portion that extends the drive shaft 23 by applying a thrust to the drive shaft 23. That is, the coil spring 26 is urged so that the drive shaft 23 extends toward the ground Rb. By extending the drive shaft 23 in the axial direction by the coil spring 26 in this way, the door body 10 is pushed up and the standing operation of the door body 10 is assisted.

The receiving portion 27 is fixed to the ground Rb extending toward the tip 24 of the drive shaft 23. The receiving portion 27 is formed in a substantially rectangular shape, and the tip 24 of the drive shaft 23 is slidably in contact with the receiving portion 27. The receiving portion 27 has a concave arc surface 28 formed on the upper surface. The arcuate surface 25 of the drive shaft 23 and the arcuate surface 28 of the receiving portion 27 have the same radius of curvature. The arcuate surface 28 of the receiving portion 27 is slidably in contact with the arcuate surface 25 of the drive shaft 23. The arcuate surfaces 25 and 28 described above are, for example, cylindrical surfaces.

The stopper 29 is provided at a position on the door body 10 on the downstream side of the case 21. The stopper 29 is a stopping portion that stops the rotational operation of the base end of the drive shaft 23 centered on the rotation center Qa when the door body 10 stands up to a predetermined standing angle. That is, when the side surface 21a of the case 21 comes into contact with the stopper 29, the rotational movement of the case 21 is stopped, and the rotational movement of the base end of the drive shaft 23 is also stopped accordingly.

As shown in FIG. 3, the auxiliary drive unit 20 is provided in a state in which the shaft core X of the drive shaft 23 extends in the vertical direction in a state where the door body 10 is laid down (hereinafter, also simply referred to as a laid down state). The rotation center Qa, the arc center Qb of the arc surface 25, and the arc center Qc of the arc surface 28 are all located on the axis X of the drive shaft 23. The arc center Qb of the arc surface 25 and the arc center Qc of the arc surface 28 are at the same positions. Further, in the inverted state, the drive shaft 23 is provided in a shortened state, and the coil spring 26 is provided in a state of being compressed (shortened) from the natural length.

<Operation of auxiliary drive unit>
The operation of the auxiliary drive unit 20 accompanying the standing operation of the door body 10 will be described with reference to FIGS. 4 and 5. In the collapsed state shown in FIG. 3, since the coil spring 26 is provided in a compressed state, the urging force of the coil spring 26 is applied to the drive shaft 23 as a thrust, and a pushing force acts on the door body 10. .. That is, the pushing force by the auxiliary drive unit 20 always acts on the door body 10 in the collapsed state. When water enters the door body 10 in the collapsed state, the door body 10 starts to stand up due to the buoyancy of the infiltrated water. At that time, the door body 10 is assisted in the standing operation by the pushing force of the auxiliary drive unit 20. Therefore, when water intrusion occurs, the door body 10 can be immediately started to stand up.

In the auxiliary drive unit 20, the drive shaft 23 operates following the standing operation of the door body 10. As shown in FIG. 4, in the auxiliary drive unit 20, the drive shaft 23 is extended by the thrust of the coil spring 26 as the door body 10 stands up. At that time, the drive shaft 23 extends with the tip 24 in contact with the receiving portion 27. Further, the case 21 rotates in the direction of the arrow Sa shown in FIG. 4 as the door body 10 stands up. That is, as the door body 10 stands up, the base end of the drive shaft 23 is in the direction opposite to the rotation direction of the door body 10 (clockwise in FIG. 4) (counterclockwise in FIG. 4) about the rotation center Qa. Rotate.

On the other hand, the tip 24 of the drive shaft 23 rotates in the direction of the arrow Sb shown in FIG. 4 as the door body 10 stands up. More specifically, the arcuate surface 25 of the tip 24 rotates about the arcuate centers Qb and Qc while sliding with the arcuate surface 28 of the receiving portion 27. That is, as the door body 10 stands up, the tip 24 of the drive shaft 23 rotates in the same direction as the rotation direction of the door body 10, that is, in the direction opposite to the base end of the drive shaft 23. In this way, the auxiliary drive unit 20 performs an extension operation and a rotation operation (sliding operation) of the drive shaft 23 in accordance with the standing operation of the door body 10.

By performing such an extension operation and a rotation operation (sliding operation) of the drive shaft 23, the rotation center Qa and the arc centers Qb and Qc are always located on the axis X of the drive shaft 23. Therefore, the reaction force F from the ground Rb (receiving portion 27) generated by the pushing force of the door body 10 described above acts on the axis X of the drive shaft 23. That is, in the auxiliary drive unit 20, the drive shaft 23 is extended and rotated so that the rotation center Qa and the arc centers Qb and Qc are always located on the axis X of the drive shaft 23 during the standing operation of the door body 10. Performs an operation (sliding operation).

Next, when the door body 10 stands up to a predetermined standing angle θ, the side surface 21a of the case 21 comes into contact with the stopper 29, and the rotation operation of the case 21 (rotational operation in the direction of arrow Sa) is stopped by the stopper 29 (FIG. 4). State shown). That is, the rotational operation of the base end of the drive shaft 23 is stopped by the stopper 29. Further, when the door body 10 stands up to the above-mentioned predetermined standing angle θ, the drive shaft 23 is set to be in the most extended state. The standing angle θ is an inclination angle of the door body 10 with respect to the horizontal plane.

Then, in the auxiliary drive unit 20, as shown in FIG. 5, when the standing angle θ of the door body 10 exceeds the predetermined standing angle θ described above, the tip 24 of the drive shaft 23 is separated (separated) from the receiving portion 27. It is configured as follows. That is, when the door body 10 stands up to the predetermined standing angle θ described above, the drive shaft 23 is in the most extended state. Therefore, when the door body 10 is further raised, the tip 24 of the drive shaft 23 is moved from the receiving portion 27. It will be separated (withdrawn). Further, since the rotational movement of the base end of the drive shaft 23 is stopped by the stopper 29, the angle of the axis X of the drive shaft 23 with respect to the door body 10 is the time when the rotational movement of the base end of the drive shaft 23 is stopped. It is maintained at an angle.

The upright door body 10 starts a lodging operation as the water level drops. Then, when the door body 10 falls down to the predetermined standing angle θ described above, the tip 24 of the drive shaft 23 fits into the arc surface 28 of the receiving portion 27 again (state shown in FIG. 4). That is, since the angle of the axis X of the drive shaft 23 with respect to the door body 10 is maintained as described above, the arcuate surface 28 of the receiving portion 27 of the tip 24 of the drive shaft 23 is smoothly maintained when the door body 10 is tilted down. Can guide you to.

As described above, in the undulating gate 1 of the above embodiment, the auxiliary drive unit 20 includes a drive shaft 23, a coil spring 26 (thrust applying unit), and a receiving unit 27. The base end of the drive shaft 23 is rotatably attached to the door body 10 about a rotation center Qa extending in the same direction as the rotation shaft 11, and the tip 24 extends toward the ground Rb and is rotatable in the axial direction. is there. The coil spring 26 extends the drive shaft 23 and pushes up the door body 10 by applying thrust to the drive shaft 23. The receiving portion 27 is provided on the ground Rb, and the tip 24 of the drive shaft 23 is slidably in contact with the ground Rb.

According to the above configuration, the drive shaft 23 follows the standing operation of the door body 10 so that the reaction force F from the ground Rb generated during the standing operation of the door body 10 acts on the axis X of the driving shaft 23. Can be made to. That is, the base end and the tip 24 of the drive shaft 23 can be operated while extending the drive shaft 23 so that the reaction force F from the ground Rb always acts on the axis X of the drive shaft 23. Therefore, it is possible to prevent the reaction force F from the ground Rb from acting as an eccentric load on the drive shaft 23, so that the drive shaft 23 can be pulled and the auxiliary drive unit 20 can be smoothly operated.

Further, in the undulating gate 1 of the above embodiment, the auxiliary drive unit 20 is configured such that the tip 24 of the drive shaft 23 is separated (separated) from the receiving unit 27 when the standing angle θ of the door body 10 exceeds a predetermined angle. Has been done. According to this configuration, it is not necessary to extend the drive shaft 23 from the start of standing up to the completion of standing up of the door body 10. Therefore, the drive shaft 23 and the coil spring 26 can be miniaturized.

Further, the required pushing force of the door body 10 is the largest at the start of standing up (that is, in the lying down state), and the required pushing up force becomes smaller as the door body 10 stands up. Therefore, as in the above embodiment, even if the tip 24 of the drive shaft 23 is separated from the receiving portion 27 from the middle of standing up and the pushing force by the auxiliary drive portion 20 does not act on the door body 10, the door body 10 can stand up. There is no effect.

Further, in the undulating gate 1 of the above embodiment, the auxiliary drive unit 20 is centered on the rotation center Qa when the standing angle θ of the door body 10 is equal to or greater than the above-mentioned predetermined angle in the rotation operation of the door body 10. A stopper 29 (stopping portion) for stopping the rotational operation of the base end of the drive shaft 23 is provided. According to this configuration, the angle of the axis X of the drive shaft 23 with respect to the door body 10 when the tip 24 of the drive shaft 23 is separated from the receiving portion 27 can be maintained. Therefore, when the door body 10 falls down to the predetermined standing angle θ described above, the tip 24 of the drive shaft 23 can be reliably guided to the arc surface 28 of the receiving portion 27 again. This configuration is effective when the tip 24 of the drive shaft 23 is separated from the receiving portion 27.

Further, the tip 24 of the drive shaft 23 has a convex arc surface 25, and the receiving portion 27 has a concave arc surface 28 that is slidably in contact with the convex arc surface 25. According to this configuration, the drive shaft 23 is operated to stand up the door body 10 more smoothly so that the reaction force F from the ground Rb generated during the standing operation of the door body 10 acts on the axis X of the drive shaft 23. Can be made to follow.

(Modified Example 1 of the Embodiment)
In this modification, the configuration of the receiving portion is changed in the auxiliary driving portion 20 of the above embodiment. That is, as shown in FIG. 6, the receiving portion 31 of this modified example has a V-shaped surface 32 instead of the concave arc surface. The V-shaped surface 32 constitutes a V-shaped concave surface in cross section. The arcuate surface 25 of the tip 24 of the drive shaft 23 is slidably in contact with the V-shaped surface 32 of the receiving portion 31.

In this modified example as well, the drive shaft 23 operates following the standing operation of the door body 10 as in the above embodiment. That is, the drive shaft 23 extends as the door body 10 stands up. Further, the base end of the drive shaft 23 rotates about the rotation center Qa in the same direction of the arrow Sa as in the above embodiment. The tip 24 of the drive shaft 23 rotates around the arc center Qb in the same direction as the arrow Sb as in the above embodiment. More specifically, the arcuate surface 25 of the tip 24 rotates while sliding with the V-shaped surface 32 of the receiving portion 31. By performing such an extension operation and a rotation operation (sliding operation) of the drive shaft 23, the rotation center Qa, the arc center Qb, and the point Qd are always located on the axis X of the drive shaft 23. Therefore, the reaction force from the ground Rb (receiving portion 31) acts on the axis X of the drive shaft 23. Therefore, the same effect as that of the above-described embodiment is obtained in this modified example. The point Qd is the bending position of the V-shaped surface 32. Further, in the present modification, the concave surface of the receiving portion 31 may be a polygonal concave surface other than the V-shaped cross section.

(Modification 2 of the embodiment)
In this modification, the configuration of the tip of the drive shaft 23 and the receiving portion is changed in the auxiliary drive unit 20 of the above embodiment. That is, as shown in FIG. 7, the tip 33 of the drive shaft 23 of this modified example has a concave arc surface 34 instead of the convex arc surface. The receiving portion 35 of this modification has a convex arc surface 36 instead of the concave arc surface. The arcuate surface 34 of the drive shaft 23 and the arcuate surface 36 of the receiving portion 35 have the same radius of curvature. The arcuate surface 36 of the receiving portion 35 is slidably in contact with the arcuate surface 34 of the drive shaft 23. The arc center Qe of the arc surface 34 and the arc center Qf of the arc surface 36 are at the same positions.

In this modified example as well, the drive shaft 23 operates following the standing operation of the door body 10 as in the above embodiment. That is, the drive shaft 23 extends as the door body 10 stands up. Further, the base end of the drive shaft 23 rotates about the rotation center Qa in the same direction of the arrow Sa as in the above embodiment. Further, the tip 33 of the drive shaft 23 rotates around the arc centers Qe and Qf in the same direction as the arrow Sb as in the above embodiment. More specifically, the arcuate surface 34 of the tip 33 rotates while sliding with the arcuate surface 36 of the receiving portion 35. By performing such an extension operation and a rotation operation (sliding operation) of the drive shaft 23, the rotation center Qa and the arc centers Qe and Qf are always located on the axis X of the drive shaft 23. Therefore, the reaction force from the ground Rb (receiving portion 35) acts on the axis X of the drive shaft 23. Therefore, the same effect as that of the above-described embodiment is obtained in this modified example.

(Modification 3 of the embodiment)
In this modification, the configuration of the tip of the drive shaft 23 and the receiving portion is changed in the auxiliary drive unit 20 of the above embodiment. That is, as shown in FIG. 8, the tip 37 of the drive shaft 23 of this modified example has a flat surface 38 extending in the horizontal direction instead of the convex arc surface. The receiving portion 41 of this modification has a flat surface 42 extending in the horizontal direction instead of the concave arc surface. The flat surface 42 of the receiving portion 41 is slidably in contact with the flat surface 38 of the drive shaft 23.

Also in this modification, the drive shaft 23 operates following the standing operation of the door body 10. Specifically, the drive shaft 23 extends as the door body 10 stands up. Further, the base end of the drive shaft 23 rotates about the rotation center Qa in the same direction of the arrow Sa as in the above embodiment. Further, the tip 37 of the drive shaft 23 horizontally moves in the direction of the arrow Sd, that is, in the downstream direction. More specifically, the flat surface 38 of the tip 37 moves horizontally while sliding with the flat surface 42 of the receiving portion 41 (two-dot chain line shown in FIG. 8). By performing such an extension operation and a sliding operation of the drive shaft 23, the drive shaft 23 is maintained in a state in which the shaft core X extends in the vertical direction. Therefore, the reaction force F from the ground Rb (receiving portion 41) acts on the axis X of the drive shaft 23. Therefore, the same effect as that of the above-described embodiment is obtained in this modified example. Note that the stopper 29 is not shown in FIGS. 6 to 8.

In the above embodiment, the member provided on the door body 10 and the member provided on the ground Rb in the auxiliary drive unit 20 may be reversed. That is, the case 21, the rotating shaft 22, the drive shaft 23, and the coil spring 26 may be provided on the ground Rb, and the receiving portion 27 may be provided on the door body 10. In that case, the stopper 29 is provided at a position where the rotational operation of the case 21 (base end of the drive shaft 23) can be stopped.

Further, in the above embodiment, the base end of the drive shaft is made rotatable by using the case 21 and the rotating shaft 22, but the technique disclosed in the present application is not limited to this, and the base end of the drive shaft has the same configuration as the tip. It may be rotatable with. That is, the case 21 and the rotating shaft 22 are omitted, and the same receiving portion provided on the ground Rb is fixed to the door body 10. Then, an arc surface similar to the tip is provided at the base end of the drive shaft. In this case, as the door body 10 stands up, the base end and the tip end of the drive shaft rotate while sliding with the respective receiving portions.

Further, in the above embodiment, the drive shaft 23 may extend until the door body 10 is completely upright and do not separate from the receiving portion. In that case, the stopper 29 becomes unnecessary.

Further, in the above embodiment, the coil spring 26 is exemplified as the thrust applying portion, but any one may be used as long as it applies thrust to the drive shaft 23 to extend the drive shaft 23.

Further, in the above embodiment, the arc surface 25 of the drive shaft 23 and the arc surface 28 of the receiving portion 27 have the same radius of curvature, but the radius of curvature of the concave arc surface 28 is the curvature of the convex arc surface 25. It may be slightly larger than the radius.

Further, in the above embodiment, the floating undulating gate 1 has been described, but the technique disclosed in the present application also applies to a manual undulating gate in which the door body 10 is manually erected and laid down instead of the buoyancy of infiltrated water. Can be applied.

As described above, the technique disclosed in the present application is useful for undulating gates.

1 Undulating gate 10 Door body 11 Rotating shaft 20 Auxiliary drive unit 23 Drive shaft 24, 33, 37 Tip 25, 28, 34, 36 Arc surface 26 Coil spring (thrust applying part)
27, 31, 35, 41 Receiving part Rb Ground θ Standing angle Qa Rotation center

Claims (3)

A door body having a rotating shaft and rotating around the rotating shaft to stand up,
It is provided between the door body in the collapsed state and the ground, and is provided with an auxiliary drive unit that assists the standing operation of the door body.
The auxiliary drive unit
The base end is rotatably attached around a rotation center extending in the same direction as the rotation axis on one of the door body and the ground, and the tip extends toward the other door body or the ground and is a shaft. A drive shaft that can be expanded and contracted in the direction,
A thrust applying portion that extends the drive shaft by applying thrust to the drive shaft and pushes up the door body.
The door body or the ground where the tip of the drive shaft extends toward the ground is provided with a receiving portion in which the tip of the drive shaft is slidably contacted .
The auxiliary drive unit is configured such that when the standing angle of the door body exceeds a predetermined angle, the tip of the drive shaft is separated from the receiving portion.
In the rotation operation of the door body, the auxiliary drive unit suppresses the rotation operation of the base end of the drive shaft centered on the rotation center when the standing angle of the door body is equal to or greater than the predetermined angle. relief gates, characterized in that it comprises a part. At the undulating gate according to claim 1,
The tip of the drive shaft and the receiving portion are characterized in that one has a convex arc surface and the other has a concave arc surface that is slidably in contact with the convex arc surface. Ups and downs gate. At the undulating gate according to claim 1,
One of the tip of the drive shaft and the receiving portion has a convex arc surface, and the other has a polygonal concave surface in cross-sectional view that is slidably in contact with the convex arc surface. An undulating gate characterized by that.

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