JP2020010790A - Overturn prevention device - Google Patents

Abstract

To provide an overturn prevention device capable of expanding a mountable range by further increasing a ratio of a stroke range of a damper to an overall length.SOLUTION: An overturn prevention device 1 includes a damper 10. The damper 10 includes a cylinder 11, a moving member 12, an attenuation force generation part 13, and an energizing member 14. The moving member 12 is partly inserted into the cylinder 11 and makes a reciprocating movement in an axial direction of the cylinder 11. The attenuation force generation part 13 generates attenuation force along with the reciprocating movement of the moving member 12. The energizing member 14 is disposed in the cylinder 11, and gives force to move the moving member 12 in a direction to project from the cylinder 11. In the damper 10, when a positional relationship between a ceiling C and furniture F changes, the moving member 12 inserted into the cylinder 11 moves in the cylinder 11 to expand and contract. The moving member 12 includes a recess 12C. The recess 12C houses at least part of the energizing member 14.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fall prevention device.

  Conventionally, as a fall prevention device provided between the ceiling and furniture, a piston connected to a rod, a damping portion provided on the piston, a compression coil spring as an urging member for applying a force to move the piston There has been known a device provided with a damper configured to include a damper (for example, see Patent Document 1). In this type of overturn prevention device, when furniture is to fall over due to shaking of an earthquake or the like, the damper contracts and absorbs vibration. Specifically, when the damper contracts, the rod moves so as to enter the cylinder, and the damping portion generates a damping force. Also, in the damper, since the compression coil spring exerts a force to move the piston, the piston compresses the compression coil spring during contraction, and the compression coil spring exerts a biasing force on the piston during extension to move the rod. The piston and rod are urged and moved in the direction in which they protrude from the cylinder.

JP 2017-169858 A

  The overturn prevention device as disclosed in Patent Literature 1 is required to have a large mountable range. For example, if the overall length of the fall prevention device is small, it can be applied to a place with a smaller space between the furniture and the ceiling. That is, the lower limit of the mountable range can be reduced by reducing the overall length of the fall prevention device.

  However, in the case of the overturn prevention device of Patent Document 1, the damper is arranged in the cylinder such that the compression coil spring is in series with the piston. In this case, the piston cannot be moved to the bottom wall side of the cylinder more than the state where the compression coil spring is most contracted and the wires are brought into close contact with each other. That is, the stroke range of the damper is limited with respect to the entire length, and the entire length is longer by the contact length of the compression coil spring. It can be said that the fall prevention device having such a configuration has a narrow applicable range.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and has been made to solve the problem of providing a tipping prevention device capable of increasing a ratio of a stroke range of a damper to an entire length and expanding a mountable range. It should be an issue to be addressed.

  The fall prevention device of the present invention is provided between a ceiling and an article. The overturn prevention device includes a damper. The damper has a cylinder, a moving member, a damping force generator, and a biasing member. The moving member is partially inserted into the cylinder and reciprocates in the axial direction of the cylinder. The damping force generating section generates a damping force as the moving member reciprocates. The urging member is arranged in the cylinder and applies a force to move the moving member in a direction protruding from the cylinder. When the positional relationship between the ceiling and the article changes, the moving member inserted into the cylinder moves in the cylinder and expands and contracts. Further, the moving member has a concave portion. The recess accommodates at least a part of the biasing member.

  In the overturn prevention device of the present invention, the moving member has a concave portion, and at least a part of the urging member is accommodated in the concave portion. Therefore, when the moving member moves in the contraction direction of the damper and the urging member is compressed, at least a part of the length of the urging member can be absorbed by the concave portion. For this reason, compared with the case where the urging member is arranged outside the moving member, the stroke range of the damper can be increased by the length of the concave portion.

  Therefore, the overturn prevention device of the present invention can increase the ratio of the stroke range of the damper to the entire length, thereby expanding the mountable range.

  In the fall prevention device of the present invention, the recess may be formed to have a length equal to or longer than the length of the urging member in the most contracted state. In this case, the biasing member can be reliably accommodated in the moving member, and the stroke range of the damper can be further increased.

In the overturn prevention device of the present invention, the working fluid can be sealed in the cylinder of the damper. Further, the biasing member may be a compression coil spring. The moving member may include a piston part and a rod part. The piston section divides the inside of the cylinder into a first chamber and a second chamber, and is housed in the cylinder slidably in the axial direction along the inner wall of the cylinder. One end of the rod portion projects outside the cylinder, and the other end is connected to the piston portion. The damping force generator may include a damper and a check valve. The damping unit imparts resistance to the flow of the working fluid from the first chamber to the second chamber. The check valve allows the flow of the working fluid from the second chamber to the first chamber. The damping part and the check valve are provided in parallel with the piston part of the moving member, and the concave part is provided in the rod part.
In this case, when the moving member moves in the direction of compressing the urging member and the damper contracts, a damping force can be generated. Further, when the moving member moves in the direction protruding from the cylinder under the force of the urging member and the damper extends, the check valve may reduce the effect of the resistance applied to the flow of the working fluid. The moving member can be returned to the original position with a relatively small resistance. In addition, by providing the damping force generating portion in the piston portion, the concave portion can be formed in the rod portion in a more free form without being restricted by the arrangement when the damping force generating portion is provided in the rod portion. Can be. For this reason, a suitable concave portion can be formed by disposing the urging member.

It is a figure which shows typically the state which attached the fall prevention apparatus of Embodiment 1 between furniture and a ceiling. It is a figure which shows the damper of the fall prevention device of Embodiment 1 typically. FIG. 3 is a diagram schematically illustrating a damper of the fall prevention device according to the first embodiment, showing a state in which the damper is more contracted than the state in FIG. 2.

  A first embodiment of a fall prevention device according to the present invention will be described with reference to the drawings. In the following description of the embodiments, furniture is exemplified as an article according to the present invention.

<First embodiment>
As shown in FIG. 1, the fall prevention device 1 according to the first embodiment is provided between a ceiling C and furniture F as an article. The fall prevention device 1 includes a damper 10. Further, the fall prevention device 1 of the present embodiment includes a pair of base portions 21 and 22. In the fall prevention device 1, a pair of base portions 21 and 22 are rotatably connected to both ends of the damper 10, respectively. The fall prevention device 1 is installed such that one base portion 21 contacts the upper surface of the furniture F and the other base portion 22 contacts the ceiling C, and the damper 10 expands and contracts to generate a damping force. At least one fall prevention device 1 is attached between the upper surface of the furniture F and the ceiling C.

  As shown in FIG. 1, the fall prevention device 1 uses the damping force of the damper 10 to prevent the furniture F from falling when the furniture F tilts due to shaking such as an earthquake. The furniture F is installed on the floor surface with the back surface facing a wall surface W extending vertically from a floor surface (not shown) serving as an installation surface. The furniture F has a rectangular parallelepiped shape, has a door, a drawer, and the like (not shown) on the front surface (the right side surface in FIG. 1), and can store clothes, accessories, and the like inside. The furniture F is a rectangular shape having a horizontal cross section that is long in the left-right direction (the depth direction in FIG. 1). When the fall prevention device is not attached, the furniture F may be inclined forward (to the right in FIG. 1) and fall due to shaking such as an earthquake.

  As shown in FIGS. 2 and 3, the damper 10 includes a cylinder 11, a moving member 12, a damping force generator 13, and an urging member 14. The damper 10 expands and contracts due to relative movement between the cylinder 11 and the moving member 12 when the furniture F tilts due to an earthquake or the like and the positional relationship between the ceiling C and the furniture F changes. In the present embodiment, the damper 10 is a hydraulic damper in which a working fluid is sealed in a cylinder 11, and a damping force is generated by a damping force generating unit 13 by expanding and contracting, and the damper 10 is An urging force is applied in the extension direction. The damper 10 is a pressure-effect damper in which the damping force generated during the extension operation is smaller than the damping force generated during the contraction operation. In addition, a gas is sealed in the cylinder 11 in addition to the working fluid in order to cope with a volume change accompanying expansion and contraction of the damper 10.

  The cylinder 11 has a bottomed cylindrical shape having an opening 11A at one end. A working fluid is sealed in the cylinder 11. A rod guide 15 is attached to the opening 11A of the cylinder 11. The rod guide 15 is formed in an annular shape having a seal member P disposed on an inner periphery thereof, and slidably passes through a rod portion 12B of a moving member 12, which will be described later. A projection 11B is formed on the bottom wall of the cylinder 11 so as to project in the axial direction toward the opening 11A. The convex portion 11B suppresses radial displacement of the urging member 14 by being inserted into the inner periphery of the urging member 14 described later. A joint member 16 is attached to an end of the cylinder 11 on the bottom wall side. The joint member 16 is a member that connects the cylinder 11 and the base 21.

  The moving member 12 is partially inserted into the cylinder 11. The moving member 12 is provided so as to be able to reciprocate along the axial direction of the cylinder 11. In the present embodiment, the moving member 12 includes a piston 12A, a rod 12B, and a recess 12C. The piston portion 12A partitions the inside of the cylinder 11 into a first chamber S1 and a second chamber S2, and is housed in the cylinder 11 slidably in the axial direction along the inner wall of the cylinder 11. Specifically, the piston portion 12A has a cylindrical shape that is flat in the axial direction. The outer peripheral surface of the piston portion 12 </ b> A is in sliding contact with the inner wall of the cylinder 11 via the seal member P. The first chamber S1 on the bottom wall side of the cylinder 11 and the second chamber S2 on the opening 11A side, which are defined by the piston portion 12A, change in size as the piston portion 12A moves in the axial direction.

  One end of the rod portion 12B protrudes outside from the cylinder 11, and the other end is connected to the piston portion 12A. Specifically, the rod portion 12B has a cylindrical shape whose longitudinal direction is the axial direction. The rod portion 12B has an outer diameter smaller than the outer diameter of the piston portion 12A, and a gap is formed between the rod portion 12B and the inner peripheral surface of the cylinder 11. The rod portion 12B has a distal end side slidably inserted into a rod guide 15 attached to an opening 11A of the cylinder 11 and protrudes outward, and a proximal end side is inserted into the cylinder 11 and integrated with the piston portion 12A. Are linked. Further, a joint member 17 is attached to a tip of the rod portion 12B. The joint member 17 is a member that connects the rod portion 12B and the base portion 22.

  The recess 12 </ b> C accommodates at least a part of the urging member 14. In the case of the present embodiment, the concave portion 12C is formed on the base end side of the rod portion 12B. In detail, as shown in FIGS. 2 and 3, the concave portion 12C is formed so as to open to the first chamber S1 and extend toward the distal end of the rod portion 12B. The axial length of the recess 12C is L. The axial length L of the concave portion 12C is set to be greater than the length (close contact length) Lbmin of the urging member 14 in a state where the urging member 14 is most contracted. The axial length L of the recess 12C is smaller than the natural length Lb of the biasing member 14. Further, on the bottom wall of the concave portion 12C, a convex portion 12D that protrudes in the axial direction toward the opening side of the concave portion 12C is formed. The protrusion 12D suppresses radial displacement of the urging member 14 by being inserted into the inner periphery of the urging member 14 described later.

  The damping force generator 13 generates a damping force as the moving member 12 reciprocates. In the case of the present embodiment, the damping force generator 13 is provided on the moving member 12. The damping force generating unit 13 includes a damping unit 13A and a check valve 13B. The damping portion 13A and the check valve 13B are disposed on the piston portion 12A of the moving member 12, respectively. Specifically, a flow path of a working fluid that connects the first chamber S1 and the second chamber S2 is formed in the piston portion 12A, and the damping portion 13A and the check valve 13B are arranged in parallel with this flow path. It is provided in.

  The damping unit 13A imparts resistance to the flow of the working fluid from the first chamber S1 to the second chamber S2. In the case of the present embodiment, the damping section 13A has an orifice. That is, the damping portion 13A has a resistance not only to the flow of the working fluid from the first chamber S1 to the second chamber S2, but also to the flow of the working fluid from the second chamber S2 to the first chamber S1. Give. The check valve 13B allows the flow of the working fluid from the second chamber S2 to the first chamber S1. Also, the check valve 13B prevents the flow of the working fluid from the first chamber S1 to the second chamber S2, which is the opposite flow.

  The damping force generating unit 13 configured to include the damping unit 13A and the check valve 13B causes the damper 10 to function as a pressure effective damper by acting as follows. The damping portion 13A imparts resistance to the flow of the working fluid between the first chamber S1 and the second chamber S2 associated with both the extension and contraction operations of the damper 10. The check valve 13B allows the flow of the working fluid from the second chamber S2 on the opening 11A side of the cylinder 11 to the first chamber S1 on the bottom wall side, but prevents the reverse flow. Therefore, in the damper 10, during the extension operation, the flow path of the working fluid from the second chamber S2 to the first chamber S1 is a path that passes through both the damping unit 13A and the check valve 13B. On the other hand, during the contraction operation, the flow path of the working fluid from the first chamber S1 to the second chamber S2 is a path that passes only through the damping portion 13A. For this reason, the damper 10 generates a damping force in each of the expanding and contracting operations in a form in which the damping force generated in the expanding operation is smaller than the damping force generated in the contracting operation.

  The urging member 14 is arranged in the cylinder 11 and applies a force for moving the moving member 12 in a direction protruding from the cylinder 11. At least a part of the urging member 14 is housed in the recess 12 </ b> C of the moving member 12. In the present embodiment, the biasing member 14 is a compression coil spring having a natural length Lb and a close contact length Lbmin. One end of the biasing member 14, which is a compression coil spring, is in contact with the bottom wall surface of the cylinder 11, and the other end is in contact with the bottom wall surface of the recess 12C. Both ends of the biasing member 14 are inserted into the convex portion 11B on the cylinder 11 side and the convex portion 12D on the concave portion 12C side, respectively.

  As shown in FIG. 1, the pair of base portions 21 and 22 are connected to a first base portion 21 connected to an end portion on the bottom wall side of the cylinder 11 and a distal end portion of a rod portion 12B of the moving member 12. The second base portion 22. The first base portion 21 contacts the upper surface of the furniture F. The second base portion 22 contacts the ceiling C. The first base portion 21 and the second base portion 22 are provided rotatably with respect to the cylinder 11 and the rod portion 12B, respectively. The first base portion 21 and the second base portion 22 have substantially the same form and structure.

  As shown in FIG. 1, the pair of base portions 21 and 22 are rotatably connected to joint members 16 and 17 by pins 21A and 22A. The pins 21A and 22A are respectively inserted in the directions orthogonal to the axis of the damper 10 to connect the pair of base portions 21 and 22 and the joint members 16 and 17. That is, each of the pair of base portions 21 and 22 is rotatably connected to the damper 10 in a direction orthogonal to the axis of the damper 10.

In the damper 10 of the first embodiment, although the working fluid is not shown in FIGS. 1 to 3, a change in the volume of the space in the cylinder 11 due to a change in the amount of the rod portion 12 </ b> B entering the cylinder 11 is allowed. It is sealed in the cylinder 11 with a possible capacity. Specifically, in the damper 10 of the first embodiment, the working fluid is sealed in the cylinder 11 with a capacity equal to or less than the volume in the cylinder 11 when the damper 10 is in the most contracted state (see FIG. 3). The rod guide 15 is formed with a communication hole (not shown) that allows the inflow and outflow of air from the outside according to the change in the volume of the space in the cylinder 11.
In place of such a configuration, for example, an external tank that allows the inflow and outflow of the working fluid due to a change in volume in the cylinder may be provided. In this case, it is preferable that the entire space in the cylinder can be filled with the working fluid, and the ratio of the stroke range to the entire length of the damper can be further increased.

  Next, the operation and effect of the overturn prevention device 1 having the above configuration will be described.

  The fall prevention device 1 is mounted between the furniture F and the ceiling C in a state where the moving member 12 can move in both the extension direction and the contraction direction of the damper 10 so that the swing of the furniture F can be absorbed. There is a need. Since at least a part of the urging member 14 is accommodated in the concave portion 12C of the moving member 12, the overturn prevention device 1 moves the piston 12A to a position closer to the contact length Lbmin of the urging member 14. Can be brought closer to the bottom side of the. In this manner, the damper 10 has a larger stroke range, and the applicable range of the fall prevention device 1 is expanded.

  The axial length L of the concave portion 12C is set to be larger than the contact length Lbmin of the urging member 14 which is a compression coil spring. Thereby, in the fall prevention device 1, as shown in FIG. 3, the piston portion 12A can be slid until it comes into contact with the bottom wall of the cylinder 11, and the stroke range of the damper 10 is further secured.

  In addition, in the overturn prevention device 1, the damping force generating unit 13 includes the damping unit 13A as an orifice and the check valve 13B. The damping portion 13A and the check valve 13B are provided in parallel in a flow path that connects the first chamber S1 and the second chamber S2 in the cylinder 11. Further, the damping portion 13A imparts resistance to the flow of the working fluid from the first chamber S1 to the second chamber S2, and the check valve 13B controls the flow of the working fluid from the second chamber S2 to the first chamber S1. It permits and blocks the flow of the working fluid from the first chamber S1 to the second chamber S2. For this reason, the fall prevention device 1 can make the damper 10 suitably function as a pressure-operating damper, and suitably prevents the furniture F from falling.

  Further, in the overturn prevention device 1, the damping portion 13A and the check valve 13B are provided in the piston portion 12A of the moving member 12 as the damping force generating portion 13, and the concave portion 12C is provided in the rod portion 12B. For this reason, compared with the case where the damping force generating portion is provided in the rod portion, the concave portion 12C of a desired form can be formed in the rod portion 12B without being restricted in arrangement or the like.

  Further, the overturn prevention device 1 employs a compression coil spring as the urging member 14. For this reason, handling is easier than in the case where compressed gas is employed as the urging member. For example, since the compressed gas is a fluid, the compressed gas may leak from the recess depending on the direction of the overturn prevention device. However, since the compression coil spring is solid, it can be securely housed in the recess 12C.

  As described above, the overturn prevention device 1 of the first embodiment includes the damper 10. The damper 10 has a cylinder 11, a moving member 12, a damping force generator 13, and a biasing member 14. The moving member 12 is partially inserted into the cylinder 11 and reciprocates in the axial direction of the cylinder 11. The damping force generator 13 generates a damping force as the moving member 12 reciprocates. The urging member 14 is arranged in the cylinder 11 and applies a force to move the moving member 12 in a direction protruding from the cylinder 11. When the positional relationship between the ceiling C and the furniture F changes, the moving member 12 inserted into the cylinder 11 moves in the cylinder 11 and expands and contracts. The moving member 12 has a concave portion 12C. The recess 12 </ b> C accommodates at least a part of the urging member 14.

  In the overturn prevention device 1, the moving member 12 has a concave portion 12C, and at least a part of the urging member 14 is housed in the concave portion 12C. Therefore, when the moving member 12 moves in the contraction direction of the damper 10 and the urging member 14 is compressed, at least a part of the length of the urging member 14 can be absorbed by the concave portion 12C. Therefore, the stroke range of the damper 10 can be increased by the length of the concave portion 12C, as compared with the case where the urging member 14 is arranged outside the moving member 12.

  Therefore, the overturn prevention device 1 can increase the ratio of the stroke range of the damper to the entire length, thereby expanding the mountable range.

  The recess 12C is formed to have a length equal to or longer than the length of the urging member 14 in the most contracted state. For this reason, the urging member 14 can be reliably accommodated in the moving member 12, and the stroke range of the damper 10 can be further increased.

  The damper 10 has a cylinder 11 filled with a working fluid. The urging member 14 is a compression coil spring. The moving member 12 includes a piston 12A and a rod 12B. The piston portion 12A partitions the inside of the cylinder 11 into a first chamber S1 and a second chamber S2, and is housed in the cylinder 11 slidably in the axial direction along the inner wall of the cylinder 11. One end of the rod portion 12B protrudes outside from the cylinder 11, and the other end is connected to the piston portion 12A. The damping force generator 13 includes a damper 13A and a check valve 13B. The damping unit 13A imparts resistance to the flow of the working fluid from the first chamber S1 to the second chamber S2. The check valve 13B allows the flow of the working fluid from the second chamber S2 to the first chamber S1. The damping portion 13A and the check valve 13B are provided in parallel with the piston portion 12A of the moving member 12, and the concave portion 12C is provided in the rod portion 12B.

  Therefore, when the moving member 12 moves in the direction of compressing the urging member 14 and the damper 10 contracts, a damping force can be generated. Further, when the moving member 12 moves in the direction protruding from the cylinder 11 under the force of the urging member 14 and the damper 10 extends, the check valve 13B exerts an effect of resistance applied to the flow of the working fluid. Can be reduced, and the moving member 12 can be moved in the urging direction by the urging member 14 with relatively small resistance. In addition, the provision of the damping force generating portion 13 in the piston portion 12A allows the rod portion 12B to have the concave portion 12C in a more free form without any restriction on the arrangement when the damping force generating portion is provided in the rod portion. Can be formed. Therefore, a suitable concave portion 12C can be formed by disposing the urging member 14.

The present invention is not limited to the embodiments described above with reference to the drawings and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the first embodiment, the fall prevention device is attached to furniture. However, the fall prevention device may be attached to an article such as a bookcase or a refrigerator that may fall due to shaking such as an earthquake. The number of the fall prevention devices is not limited to one, and can be appropriately selected according to the type of the target article.
(2) In the first embodiment, the base portions are connected to both ends of the damper, and are brought into contact with the ceiling and the upper surfaces of furniture as articles, respectively. However, this is not essential. The fall prevention device may be in a form in which the end of the damper is directly attached to the ceiling or furniture, or another member such as a base may be interposed between the damper and the ceiling or furniture. It may be in the form of being installed.
(3) In the first embodiment, the hydraulic damper in which the working fluid is sealed in the cylinder is exemplified. However, for example, a friction damper that generates a frictional force between the moving member and the cylinder, or a granular material is sealed in the cylinder. Another type of damper, such as a damper that has been used, may be used. When a hydraulic damper is used, the type of the working fluid and the like are not particularly limited.
(4) In the first embodiment, the compression coil spring is exemplified as the urging member. However, another type of urging member may be adopted, such as applying the expansion force of the compressed gas in the direction in which the damper extends. A combination of different types of biasing members such as a compression coil spring and a compressed gas may be employed. When a compressed gas is used as the urging member, it is preferable to prevent leakage of the compressed gas from the concave portion by, for example, disposing a free piston in the concave portion to seal the compressed gas.
(5) In the first embodiment, an example in which the moving member includes the piston portion and the rod portion has been described, but this is not essential. Further, in the form having the piston portion and the rod portion, it is not essential to provide them integrally, but they may be provided separately and connected.
(6) In the first embodiment, as the damping force generating unit, the damping force generating unit having a specific configuration including the damping unit and the check valve is exemplified, but this is not essential. The configuration and the like of the damping force generating unit are not particularly limited as long as the damping force generating unit generates a damping force with the reciprocating movement of the moving member. Various configurations can be adopted for the damping force generator according to the type of the damper. In addition, as a configuration of the damping force generating unit in the hydraulic damper, for example, a configuration in which the cross-sectional area of the flow path through which the working fluid flows when the damper extends and contracts can be adopted.

  DESCRIPTION OF SYMBOLS 1 ... Fall prevention device, 10 ... Damper, 11 ... Cylinder, 11A ... Opening part, 12 ... Moving member, 12A ... Piston part, 12B ... Rod part, 12C ... Concave part, 13 ... Damping force generation part, 13A ... Damping part, 13B ... check valve, 14 ... urging member, 15 ... rod guide, 16 ... joint member, 16, 17 ... joint member, 21, 22 ... base portion (21 ... first base portion, 22 ... second base portion) , 21A, 22A: Pin, C: Ceiling, F: Furniture, Lb: Natural length, Lbmin: Adhesion length, P: Seal member, S1: First chamber, S2: Second chamber, W: Wall surface

In overturning prevention device of the present invention, the recess, Ru Tei is formed by a length over the length of the state where the biasing member is most contracted. For this reason , the urging member can be reliably accommodated in the moving member, and the stroke range of the damper can be further increased.

Claims (3)

A fall prevention device provided between a ceiling and an article,
A cylinder, a moving member that is partially inserted into the cylinder and reciprocates in the axial direction of the cylinder, a damping force generator that generates a damping force with the reciprocating movement of the moving member, And a biasing member for applying a force to move the moving member in a direction protruding from the cylinder, and the moving member moves inside the cylinder when a positional relationship between the ceiling and the article changes. Is equipped with a damper that moves and expands
The fall prevention device, wherein the moving member includes a concave portion that accommodates at least a part of the urging member.   2. The fall prevention device according to claim 1, wherein the recess is formed to have a length equal to or longer than a length of the urging member in a most contracted state. The damper has a working fluid sealed in the cylinder,
The biasing member is a compression coil spring,
The moving member,
A piston section that partitions the inside of the cylinder into a first chamber and a second chamber, and that is slidably accommodated in the cylinder along the inner wall of the cylinder in an axial direction;
A rod part protruding outside from the cylinder and having the other end connected to the piston part,
The damping force generator,
A damping unit that imparts resistance to the flow of the working fluid from the first chamber to the second chamber;
A check valve that allows the flow of the working fluid from the second chamber to the first chamber,
The damping portion and the check valve are provided in parallel with the piston portion,
The overturn prevention device according to claim 1, wherein the recess is provided in the rod portion.

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