JP6469291B1 - Fall prevention device - Google Patents

Abstract

To provide a fall prevention device capable of increasing a ratio of a stroke range of a damper with respect to a full length to expand a mountable range.
An overturn prevention device (1) includes a damper (10). The damper 10 includes a cylinder 11, a moving member 12, a damping force generation unit 13, and an urging 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 disposed in the cylinder 11 and applies a force for moving 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 damper 10 is expanded and contracted by the moving member 12 inserted into the cylinder 11 moving inside the cylinder 11. Further, the moving member 12 includes a recess 12C. The recess 12 </ b> C accommodates at least a part of the biasing member 14.
[Selection] Figure 1

Description

  The present invention relates to a fall prevention device.

  Conventionally, as a fall prevention device provided between a ceiling and furniture, a piston connected to a rod, a damping part provided on the piston, and a compression coil spring as a biasing member that applies a force to move the piston, The thing provided with the damper comprised by having was known (for example, refer patent document 1). In this type of fall prevention device, the damper contracts to absorb vibrations when the furniture is about to fall due to an earthquake or the like. Specifically, when the damper contracts, the rod moves so as to enter the cylinder, and a damping force is generated by the damping unit. The damper also applies a force that causes the compression coil spring to move the piston, so that the piston compresses the compression coil spring when contracting, and the compression coil spring applies an urging force to the piston when extending, causing the rod to move. The piston and the rod are urged and moved in the direction of protruding from the cylinder.

JP 2017-169858 A

  The fall prevention device like patent document 1 is calculated | required that an attachment possible range is large. For example, if the total length of the fall prevention device is small, it can be applied to a narrower space between the furniture and the ceiling. That is, the lower limit of the mountable range can be lowered by reducing the total 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 so 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 beyond 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 increased by the contact length of the compression coil spring. It can be said that the applicable range of the fall prevention device having such a configuration has been narrowed.

  The present invention has been made in view of the above-described conventional situation, and solves the problem of providing a tip-over prevention device capable of enlarging the mountable range by increasing the ratio of the stroke range of the damper to the total length. It is an issue that should be done.

  The fall prevention device of the present invention is provided between a ceiling and an article. The fall prevention device includes a damper. The damper includes a cylinder, a moving member, a damping force generation unit, and an urging member. A part of the moving member is inserted into the cylinder and reciprocates in the axial direction of the cylinder. The damping force generation unit generates a damping force as the moving member reciprocates. The urging member is disposed in the cylinder and applies a force for moving the moving member in a direction protruding from the cylinder. When the positional relationship between the ceiling and the article changes, the damper is expanded and contracted by the moving member inserted into the cylinder moving in the cylinder. The moving member has a recess. The recess houses at least a part of the biasing member.

  In the fall prevention device of the present invention, the moving member has a recess, and at least a part of the urging member is accommodated in the recess. For this reason, 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 recess. For this reason, compared with the case where the biasing member is arrange | positioned on the outer side of a moving member, the stroke range of a damper can be enlarged by the part of the length of a recessed part.

  Therefore, the fall prevention device of the present invention can increase the ratio of the damper stroke range with respect to the total length to expand the mountable range.

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.

In the fall prevention device of the present invention, the damper may be filled with a working fluid in the cylinder. Further, the biasing member may be a compression coil spring. The moving member may comprise a piston part and a rod part. The piston portion divides the inside of the cylinder into a first chamber and a second chamber, and is housed in the cylinder so as to be slidable in the axial direction along the inner wall of the cylinder. The rod part has one end protruding from the cylinder to the outside and the other end connected to the piston part. The damping force generation unit may include a damping unit and a check valve. The attenuation unit provides 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, a damping force can be generated when the moving member moves in the direction of compressing the biasing member and the damper contracts. In addition, when the moving member moves in a direction protruding from the cylinder under the force of the urging member and the damper extends, the check valve can reduce the influence 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 in arrangement when the damping force generating portion is provided in the rod portion. Can do. For this reason, a suitable recessed part can be formed by arrangement | positioning of a biasing member.

It is a figure which shows typically the state which attached the fall prevention apparatus of Embodiment 1 between furniture and the ceiling. It is a figure which shows typically the damper of the fall prevention apparatus of Embodiment 1. FIG. It is a figure which shows typically the damper of the fall prevention apparatus of Embodiment 1, and shows the state contracted rather than the state of FIG.

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

<Embodiment 1>
As shown in FIG. 1, the overturn 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. The overturn prevention device 1 of the present embodiment includes a pair of base portions 21 and 22. In the overturn prevention device 1, a pair of base portions 21 and 22 are rotatably connected to both ends of the damper 10. The fall prevention device 1 is installed in such a manner 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 or more fall prevention devices 1 are attached between the upper surface of the furniture F and the ceiling C.

  As shown in FIG. 1, the overturn prevention device 1 prevents the furniture F from overturning using the damping force of the damper 10 when the furniture F is tilted due to a shake such as an earthquake. The furniture F is installed on the floor surface with a back surface facing a wall surface W extending in the vertical direction from a floor surface (not shown) serving as an installation surface. The furniture F has a rectangular parallelepiped shape, and has a door, a drawer, etc. (not shown) on the front (right side in FIG. 1), and can store clothes, accessories, and the like inside. The furniture F has a rectangular shape in which the horizontal cross-sectional shape 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 tilted forward (rightward in FIG. 1) 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 generation unit 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 is tilted 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 the damping force generation unit 13 by expanding and contracting, and the damper 10 A biasing force is applied in the extending direction. The damper 10 is a pressure damper in which the damping force generated during the extension operation is smaller than the damping force generated during the contraction operation. In addition, in order to respond to the volume change accompanying the expansion / contraction of the damper 10, gas is also enclosed in the cylinder 11 in addition to the working fluid.

  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 11 </ b> A of the cylinder 11. The rod guide 15 is formed in an annular shape with a seal member P disposed on the inner periphery, and is slidably inserted through a rod portion 12B of the moving member 12 described later. Further, the bottom wall of the cylinder 11 is formed with a protrusion 11B that protrudes in the axial direction toward the opening 11A. The convex portion 11 </ b> B suppresses the 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 the 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 portion 21.

  A part of the moving member 12 is inserted into the cylinder 11. The moving member 12 is provided so as to be capable of reciprocating along the axial direction of the cylinder 11. In the present embodiment, the moving member 12 includes a piston portion 12A, a rod portion 12B, and a recess 12C. The piston portion 12 </ b> A divides the inside of the cylinder 11 into a first chamber S <b> 1 and a second chamber S <b> 2 and is accommodated in the cylinder 11 so as to be slidable 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 through the seal member P. The size of the first chamber S1 on the bottom wall side of the cylinder 11 and the second chamber S2 on the opening 11A side defined by the piston portion 12A changes as the piston portion 12A moves in the axial direction.

  The rod portion 12B has one end protruding outward from the cylinder 11 and the other end 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 12 </ b> B has an outer diameter smaller than the outer diameter of the piston portion 12 </ b> A, and a gap is formed between 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 the opening 11A of the cylinder 11 and protrudes outward, and a proximal end side is inserted into the cylinder 11 and integrally formed with the piston portion 12A. It is connected. A joint member 17 is attached to the tip of the rod portion 12B. The joint member 17 is a member that connects the rod portion 12 </ b> B and the base portion 22.

  The recess 12 </ b> C accommodates at least a part of the biasing member 14. In the present embodiment, the recess 12C is formed on the proximal end side of the rod portion 12B. Specifically, as shown in FIGS. 2 and 3, the recess 12 </ b> C is formed in a form that opens toward the first chamber S <b> 1 and extends toward the distal end of the rod portion 12 </ b> B. The length of the recess 12C in the axial direction is L. The length L in the axial direction of the recess 12C is set to be larger than the length (contact length) Lbmin in a state in which an urging member 14 described later is contracted most. The axial length L of the recess 12C is smaller than the natural length Lb of the urging member 14. In addition, a convex portion 12D that protrudes in the axial direction toward the opening side of the concave portion 12C is formed on the bottom wall of the concave portion 12C. The convex portion 12 </ b> D suppresses the displacement of the urging member 14 in the radial direction 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 this embodiment, the damping force generator 13 is provided on the moving member 12. The damping force generation unit 13 includes a damping unit 13A and a check valve 13B. The damping part 13A and the check valve 13B are arranged on the piston part 12A of the moving member 12, respectively. Specifically, a flow path for the working fluid that communicates 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 in parallel with the flow channel. Is provided.

  The attenuation unit 13A provides 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 attenuation portion 13A is configured to have an orifice. That is, the attenuating portion 13A resists not only the flow of the working fluid from the first chamber S1 to the second chamber S2, but also 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. Further, the check valve 13B blocks the flow of the working fluid from the first chamber S1 to the second chamber S2 which is the opposite flow.

  The damping force generation unit 13 configured to include the damping unit 13A and the check valve 13B acts as follows to cause the damper 10 to function as a pressure damper. The damping part 13A provides resistance to the flow of the working fluid between the first chamber S1 and the second chamber S2 that accompanies both the expansion 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. For this reason, in the damper 10, during the extension operation, the flow path of the working fluid from the second chamber S <b> 2 to the first chamber S <b> 1 is a path through which both the damping portion 13 </ b> A and the check valve 13 </ b> B pass. 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 attenuation portion 13A. For this reason, the damper 10 generates a damping force in each of the expansion and contraction operations in a form in which the damping force generated during the extension operation is smaller than the damping force generated during the contraction operation.

  The urging member 14 is disposed 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 accommodated in the recess 12 </ b> C of the moving member 12. In the present embodiment, the urging member 14 is a compression coil spring having a natural length Lb and a contact length Lbmin. The biasing member 14 that is a compression coil spring has one end in contact with the bottom wall surface of the cylinder 11 and the other end in contact with the bottom wall surface of the recess 12C. Further, both ends of the urging 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 parts 21 and 22 are connected to a first base part 21 connected to an end part on the bottom wall side of the cylinder 11 and a tip part of a rod part 12 </ b> B of the moving member 12. This is 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 so as to be rotatable 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 the joint members 16 and 17 by pins 21A and 22A. The pins 21 </ b> A and 22 </ b> A are inserted in a direction 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 connected to the damper 10 so as to be rotatable in a direction orthogonal to the axis of the damper 10.

In the damper 10 of the first embodiment, the working fluid is not shown in FIGS. 1 to 3, but the volume of the space in the cylinder 11 is allowed to change with the change in the amount of the rod portion 12 </ b> B entering the cylinder 11. It is enclosed in the cylinder 11 with a possible capacity. Specifically, in the damper 10 of the first embodiment, the working fluid is enclosed in the cylinder 11 with a capacity equal to or less than the volume in the cylinder 11 in a state where the damper 10 is most contracted (see FIG. 3). The rod guide 15 has a communication hole (not shown) that allows air to flow in and out from the outside as the volume of the space in the cylinder 11 changes.
In addition, it is good also as a form which provides an external tank which accept | permits the inflow / outflow of the working fluid accompanying the volume change in a cylinder instead of such a structure, for example. In this case, it is preferable because the working fluid can be filled in the entire space in the cylinder, and the ratio of the stroke range to the entire length of the damper can be further increased.

  Next, the effect of the fall prevention device 1 having the above configuration will be described.

  The fall prevention device 1 is attached between the furniture F and the ceiling C in a state in which the moving member 12 is movable in both the extending direction and the contracting direction of the damper 10 so that the swing of the furniture F can be absorbed. There is a need. In the overturn prevention device 1, since at least a part of the urging member 14 is accommodated in the recess 12 </ b> C of the moving member 12, the piston portion 12 </ b> A is moved to a position closer to the contact length Lbmin of the urging member 14. It is possible to make it close to the bottom side of. Thus, 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 recess 12C is set to be larger than the contact length Lbmin of the urging member 14 that is a compression coil spring. Thereby, in the fall prevention apparatus 1, as shown in FIG. 3, it can be made to slide until 12 A of piston parts contact | abut on the bottom wall of the cylinder 11, and the stroke range of the damper 10 is ensured more largely.

  Moreover, in the fall prevention apparatus 1, the damping force generation part 13 comprises the damping part 13A which is an orifice, and the check valve 13B. The damping part 13A and the check valve 13B are provided in parallel in a flow path that communicates the first chamber S1 and the second chamber S2 in the cylinder 11. The damping unit 13A provides resistance to the flow of the working fluid from the first chamber S1 to the second chamber S2, and the check valve 13B allows the flow of the working fluid from the second chamber S2 to the first chamber S1. Allow and block the flow of working fluid from the first chamber S1 to the second chamber S2. For this reason, the fall prevention apparatus 1 can function the damper 10 suitably as a pressure damper, and prevents the furniture F from falling over.

  Further, the overturn prevention device 1 has a damping part 13A and a check valve 13B provided as a damping force generation part 13 in the piston part 12A of the moving member 12, and a recessed part 12C provided in the rod part 12B. For this reason, compared with the case where a damping force generation part is provided in a rod part, the recessed part 12C of a desired form can be formed in the rod part 12B, without receiving the restrictions on arrangement | positioning.

  Further, the overturn prevention device 1 employs a compression coil spring as the biasing member 14. For this reason, handling is easy compared with the case where compressed gas is employ | adopted as an urging | biasing member. For example, since the compressed gas is a fluid, it may leak from the recess depending on the orientation of the overturn prevention device. However, since the compression coil spring is solid, it can be securely accommodated in the recess 12C.

  As described above, the overturn prevention device 1 according to the first embodiment includes the damper 10. The damper 10 includes a cylinder 11, a moving member 12, a damping force generation unit 13, and an urging 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 disposed in the cylinder 11 and applies a force for moving 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 damper 10 is expanded and contracted by the moving member 12 inserted into the cylinder 11 moving inside the cylinder 11. Further, the moving member 12 includes a recess 12C. The recess 12 </ b> C accommodates at least a part of the biasing member 14.

  In the overturn prevention device 1, the moving member 12 includes a recess 12 </ b> C, and at least a part of the urging member 14 is accommodated in the recess 12 </ b> C. For this reason, 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 recess 12C. For this reason, compared with the case where the urging member 14 is disposed outside the moving member 12, the stroke range of the damper 10 can be increased by the length of the recess 12C.

  Therefore, the overturn prevention device 1 can increase the ratio of the stroke range of the damper with respect to the entire length to expand the attachable range.

  Further, the recess 12C is formed with a length equal to or longer than the length of the state in which the urging member 14 is most contracted. 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 working fluid sealed in a cylinder 11. The urging member 14 is a compression coil spring. The moving member 12 includes a piston portion 12A and a rod portion 12B. The piston portion 12 </ b> A divides the inside of the cylinder 11 into a first chamber S <b> 1 and a second chamber S <b> 2 and is accommodated in the cylinder 11 so as to be slidable in the axial direction along the inner wall of the cylinder 11. The rod portion 12B has one end protruding outward from the cylinder 11 and the other end connected to the piston portion 12A. The damping force generation unit 13 includes a damping unit 13A and a check valve 13B. The attenuation unit 13A provides 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 to the piston portion 12A of the moving member 12, and the recess 12C is provided in the rod portion 12B.

  For this reason, when the moving member 12 moves in the direction in which the biasing member 14 is compressed and the damper 10 contracts, a damping force can be generated. In addition, when the moving member 12 moves in a direction protruding from the cylinder 11 under the force of the urging member 14 and the damper 10 extends, the check valve 13B influences the resistance applied to the flow of the working fluid. The moving member 12 can be moved in the urging direction by the urging member 14 with a relatively small resistance. Further, by providing the damping force generating portion 13 in the piston portion 12A, the concave portion 12C can be formed in the rod portion 12B in a more free form without being restricted in arrangement when the damping force generating portion is provided in the rod portion. Can be formed. For this reason, a suitable recess 12 </ b> C can be formed by the arrangement of the urging member 14.

The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) Although the fall prevention device is attached to the furniture in the first embodiment, 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. Moreover, the number of installation of the fall prevention device 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 portion is connected to both ends of the damper and is brought into contact with the ceiling and the upper surface of the furniture as an article, but this is not essential. The fall prevention device may be configured such that the end of the damper is directly attached to the ceiling or furniture, or other members such as a base are interposed between the damper and the ceiling or furniture. May be installed.
(3) In the first embodiment, the hydraulic damper in which the working fluid is sealed in the cylinder is illustrated. 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 Other types of dampers may be used, such as a modified damper. Moreover, when using a hydraulic damper, the kind of working fluid, etc. are not specifically limited.
(4) In Embodiment 1, the compression coil spring is exemplified as the biasing member. However, other types of biasing members may be employed, such as causing the expansion force of the compressed gas to act in the extension direction of the damper. You may employ | adopt the combination of the biasing member of a different form, such as a compression coil spring and compressed gas. In addition, when using compressed gas as an urging | biasing member, it is preferable to set it as the structure which prevents leakage from the recessed part of a compressed gas, such as arranging a free piston in a recessed part and sealing compressed gas.
(5) In Embodiment 1, although the form which comprises a piston part and a rod part as a moving member was illustrated, this is not essential. Moreover, in the form which comprises a piston part and a rod part, providing these integrally is not essential, and you may provide and connect separately.
(6) In the first embodiment, the damping force generation unit having the specific configuration including the damping unit and the check valve is illustrated as the damping force generation unit, but this is not essential. The configuration and the like of the damping force generation unit are not particularly limited as long as the damping force is generated as the moving member reciprocates. The damping force generator can employ various configurations depending on the type of damper. In addition, as a configuration of the damping force generation 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 can be adopted when the damper is extended and contracted.

  DESCRIPTION OF SYMBOLS 1 ... Fall prevention device, 10 ... Damper, 11 ... Cylinder, 11A ... Opening part, 12 ... Moving member, 12A ... Piston part, 12B ... Rod part, 12C ... Recessed part, 13 ... Damping force generation part, 13A ... Damping part, 13B ... Check valve, 14 ... Biasing member, 15 ... Rod guide, 16 ... Joint member, 16, 17 ... Joint member, 21, 22 ... Base part (21 ... First base part, 22 ... Second base part) 21A, 22A ... pin, C ... ceiling, F ... furniture, Lb ... natural length, Lbmin ... contact length, P ... sealing member, S1 ... first chamber, S2 ... second chamber, W ... wall surface

Claims (2)

A fall prevention device provided between the ceiling and the article,
A cylinder, a moving member that is partially inserted into the cylinder and reciprocally moves in the axial direction of the cylinder, a damping force generator that generates a damping force in accordance with the reciprocating movement of the moving member, and a cylinder And an urging member that applies a force to move the moving member in a direction protruding from the cylinder, and the moving member moves into the cylinder when the positional relationship between the ceiling and the article changes. Equipped with a damper that expands and contracts
The moving member includes a recess that houses at least a part of the biasing member ;
The overturn prevention device , wherein the recess is formed with 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 is
A piston portion that divides the inside of the cylinder into a first chamber and a second chamber, and that is slidable in the axial direction along the inner wall of the cylinder;
A rod portion having one end protruding outward from the cylinder and the other end connected to the piston portion;
The damping force generator is
An attenuating portion that provides resistance to the flow of the working fluid from the first chamber to the second chamber;
A check valve that allows a flow of 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,
The overturn prevention device according to claim 1, wherein the concave portion is provided in the rod portion.

Images