Patent Application
20190040923
The present invention relates to a damper and an overturn preventing device equipped with the damper.
Patent Document 1 discloses an overturn preventing device equipped with a conventional damper, The damper includes a cylinder, a rod guide, a piston, and a rod. The cylinder is bottomed and is cylindrical in shape. The cylinder has an opening closed by the rod guide. The piston is slidably housed in the cylinder. The rod has a proximal end coupled to the piston and is slidably inserted through the rod guide, and a distal end side of the rod protrudes out of the cylinder. The damper encloses a hydraulic fluid. and a compressed gas in the cylinder. The damper constitutes an overturn preventing device to be mounted between a top surface of a piece of furniture and a ceiling. The overturn preventing device is mounted between the top surface of the furniture and the ceiling in a state where the bottom of the cylinder of the damper is located lower than the opening and where the rod protrudes upward from the cylinder and where central axes of the cylinder and the rod are inclined at a predetermined angle with respect to a horizontal plane. When the furniture is tilted by shaking of earthquake or the like, the piston of the damper is moved in the hydraulic fluid with the result that a damping force is generated. The damping force acts on the furniture to suppress the tilt of the furniture, whereby the furniture can be prevented from overturn.
Patent Document 1: Japanese Patent Application Publication No. JP 2015-6330
However, the piston of this damper has a possibility of being moved not only in the hydraulic fluid but also in the compressed gas enclosed above the hydraulic fluid in the cylinder.
When the piston is moved in the compressed gas, the damper cannot generate a damping force. In other words, this damper cannot generate the damping force in an entire stroke range.
Furthermore, when a space between the top surface of the furniture and the ceiling is wide, the overturn preventing device equipped with this damper has a possibility of being mounted between the top surface of the furniture and the ceiling while the piston is placed in the compressed gas enclosed above the hydraulic fluid. When the overturn preventing device is mounted with the piston being placed in the compressed gas and the furniture is tilted by shaking of earthquake or the like, no damping force is generated by the damper until the damper is contracted so that the piston is moved into the hydraulic fluid. Accordingly, this overturn preventing device has a possibility that the damping force of the damper does not act on the furniture effectively with the result that the furniture would be overturned.
The present invention was made in view of the above-described circumstances in the conventional art and has an object to provide a damper which can exert a damping force in an entire stroke range and an overturn preventing device which can successfully prevent an article from overturn by equipment of the damper.
A damper in accordance with the invention includes a cylinder, a rod guide, a piston, a rod, and a regulator. The cylinder is bottomed and is cylindrical in shape. The rod guide closes an opening of the cylinder. The piston is slidably housed in the cylinder. The rod has a proximal end coupled to the piston and slidably inserted through the rod guide, so that a distal end side of the rod protrudes out of the cylinder. In the damper, an operating liquid and a gas are enclosed in the cylinder. The regulator regulates a position of the piston so that the piston is immersed in the operating liquid enclosed below the gas in the cylinder in a state where a bottom of the cylinder is located lower than the opening and the rod protrudes upward from the cylinder and where central axes of the cylinder and the rod are inclined at a predetermined angle with respect to a horizontal plane.
Here, the predetermined angle is assumed to be an angle at which the damper is actually used, and ranges from 65° to 90°, for example.
In the damper in accordance with the invention, the cylinder may have an interior divided by the piston into a rod-side pressure chamber in which the proximal end of the rod is housed and a counter-rod-side pressure chamber. The regulator may be disposed between the piston and the rod guide in the rod-side pressure chamber and may have a predetermined length along a central axis of the rod.
In the damper in accordance with the invention, the regulator may be a bag in which a gas is filled in a compressed state and which is elastically deformable while maintaining a length thereof in a direction of the central axis of the rod.
In the damper in accordance with the invention, the regulator may be a protrusion which protrudes inward from an inner surface of the cylinder located nearer to the rod guide side than the piston and to which an outer peripheral edge of the piston is locked.
In the damper in accordance with the invention, the regulator may be an annular member which is fixed in the cylinder to be located nearer to the rod guide side than the piston and has an insertion hole formed in a center thereof through which the rod is inserted.
In the damper in accordance with the invention, the regulator may be a flange which. protrudes outward from an outer peripheral surface of the rod and is locked to a lateral face of the rod guide at the piston side.
An overturn preventing device in accordance with the invention includes the above-described damper. The damper is mounted between a ceiling and a top surface of an article installed on an installation surface in the state where the bottom of the cylinder is located lower than the opening and the rod Protrudes upward from the cylinder and where central axes of the cylinder and the rod are inclined at the predetermined angle with respect to the horizontal plane.
Here, the predetermined angle is from 65° to 85° at which angle the article can be successfully prevented from overturn. The article includes furniture, a plurality of beds connected to each other in the up-down direction, large sized televisions, refrigerators, book shelves, showcases, server racks, and the like all of which have a possibility of being overturned by shaking of earthquake or the like.
First to fifth embodiments of the overturn preventing device equipped with a damper, in accordance with the present invention will be described with reference to the drawings.
The overturn preventing device of a first embodiment includes a damper 10 and a pair of bases 30A and 30B, as illustrated in
The damper 10 includes a cylinder 11, a rod guide 12, a piston 13, a rod 14, a cylindrical member 15 serving as a regulator, and two joints 16 respectively provided on two ends of the damper 10, as illustrated in
The cylindrical member 15 serving as the regulator is formed into a substantially cylindrical shape, as illustrated in
The overturn preventing device equipped with this damper 10 is mounted between the top surface of the furniture F and the ceiling C in a state where the bottom of the cylinder 11 is located lower than the opening of the cylinder 11, and where the rod 14 protrudes upward from the cylinder 11, and where central axes of the cylinder 11 and the rod 14 are inclined at an angle between 65° and 75° with respect to a horizontal plane, as will be described later. The cylindrical member 15 has a predetermined length along a central axis of the rod 14 and regulates the position of the piston 13 so that the piston is immersed in the hydraulic fluid Y enclosed below the compressed gas G in the state where the central axes of the cylinder 11 and the rod 14 are inclined at the angle between 65° and 75° with respect to the horizontal plane. In other words, when the piston 13 abuts against the abutting part 15B of the cylindrical member 15 interposed between the piston 13 and the rod guide 12, the piston 13 is not allowed to be further moved to the rod guide 12 side. Furthermore, the piston 13 in this damper 10 is in an immersed state in the hydraulic fluid Y when the piston 13 is in abutment against the abutting part 15B of the cylindrical member 15. As a result, the damper 10 can exert a damping force with the movement of the piston 13 in the hydraulic fluid Y in the entire stroke range.
The damper 10 is a compression damper in which a damping force generated during an extending operation is smaller than a damping force generated during a contracting operation. Here, the extending operation of the damper 10 refers to an operation which increases an amount of protrusion of the rod 14 out of the cylinder 11 and a length of the damper 10. The contracting operation of the damper 10 refers to an operation which reduces an amount of protrusion of the rod 14 out of the cylinder 11 and the length of the damper 10. In the damper 10, an expansion force of the compressed gas G enclosed in the cylinder 11 acts in an extension direction.
The following will describe a mechanism of generating a damping force by the damper 10. Since the mechanism has a known structure, diagrammatic representation is eliminated. The cylinder 10 has an interior divided by the piston 13 into a rod-side pressure chamber 11B in which the proximal end of the rod 14 is housed and a counter-rod-side pressure chamber 11A. The piston 13 is formed with an orifice communicating between both pressure chambers. The orifice functions as a damping force generator which applies resistance to a flow of the hydraulic fluid Y between the rod-side pressure chamber 11B and the counter-rod-side pressure chamber 11A with the extending/contracting operation of the damper 10. Furthermore, the piston 13 is formed with a communication path communicating via a check valve with both pressure chambers. The check valve allows the hydraulic fluid Y to flow from the rod-side pressure chamber 11B to the counter-rod-side pressure chamber 11A and blocks reverse flow of the hydraulic fluid. Accordingly, the damper 10 has two flow paths of the hydraulic fluid from the rod-side pressure chamber 11B to the counter-rod-side pressure chamber 11A during the extending operation, that is, one flow path including the orifice and the other flow path including the communication path. On the other hand, the damper 10 has only one flow path of the hydraulic fluid Y from the counter-rod-side pressure chamber 11A to the rod-side pressure chamber 11B through the orifice during the contracting operation. Accordingly, the damping force generated by the damper 10 during the extending operation is smaller than the damping force generated by the damper 10 during the contracting operation.
The joints 16 are each formed by bending a flat plate-shaped metal fitting as illustrated in
The paired bases 30A and 30B are respectively a first base 30A to which the joint 16 connected to the bottom of the cylinder 11 is coupled and a second base 30B to which the joint 16 connected to a distal end of the rod 14 is coupled, as illustrated in
The base body 31 has a rectangular outer shape in a planar view of the first base 30A as viewed from above in a state where the first base 30A placed in abutment on the top surface of the furniture F (hereinafter, a direction in which a long side in the outer shape of the base body 31 extends in this planar view will be referred to as “a long side direction” and a direction in which a short side extends will be referred to as “a short side direction”) Furthermore, in a side view of the first base 30A as viewed in the short side direction in the state where the first base 30A is placed in abutment on the top surface of the furniture F, the base body 31 has a lower edge which extends straightforward in parallel to the top surface of the furniture F and an upper edge which upwardly bulges from both sides of the lower edge thereby to have an arc-shaped outer shape (refer to
In the first base 30A placed in abutment on the top surface of the furniture F, the base body 31 had a groove 32 which is formed in an upper surface thereof and extends in the long side direction (a right-left direction as viewed in
In the first base 30A placed in abutment on the top surface of the furniture F, the base body 31 has recesses 33 respectively formed in both sides of the groove 32 in the middle in the long side direction, as illustrated in
The rotating shaft member is composed of a bolt 51 inserted from one of the insertion holes 35 of the base body 31 and the nut 52 screwed onto a shaft part 51B of the bolt 51, as illustrated in
The bushes 55 are respectively attached to the through holes formed in the joints 16 of the damper 10, as illustrated in
The slip preventing part 37 has an outer shape that is similar to and slightly larger than an outer shape of the base body 31 (a rectangular shape), as illustrated in
The overturn preventing device having the above-described construction is mounted between the top surface of the furniture F and the ceiling C so that the bottom of the cylinder 11 is located lower than the opening of the cylinder 11, so that the rod 14 protrudes upward from the cylinder 11, and so that the central axes of the cylinder 11 and the rod 14 are inclined at the angle between 65° and 75° with respect to the horizontal plane. When the overturn preventing device is thus mounted between the top surface of the furniture F and the ceiling C, the piston 13 of the damper 10 is put in a immersed state in the hydraulic fluid Y. Accordingly, when the furniture F is tilted by shaking of earthquake or the like, the damper 10 can exert a damping force in the entire stroke range so that the damping force of the damper 10 can always act on the furniture F, with the result that the furniture F can be prevented from overturn.
Accordingly, the overturn preventing device of the first embodiment can successfully prevent the furniture from overturn.
As described above, the damper 10 composing the overturn preventing device includes the cylinder 11, the rod guide 12, the piston 13, the rod 14 and the cylindrical member 15. The cylinder is bottomed and cylindrical in shape. The rod guide 12 closes the opening of the cylinder 11. The piston 13 is slidably housed in the cylinder 11. The rod 14 has the proximal end coupled to the piston 13 and slidably inserted through the rod guide 12, so that the distal end side thereof protrudes out of the cylinder 11. In the damper 10, the hydraulic fluid Y and the compressed gas G are enclosed in the cylinder 11. The cylindrical member 15 regulates the position of the piston 13 so that the piston 13 is immersed in the hydraulic fluid Y enclosed below the compressed gas G in the cylinder 11 in the state where the bottom of the cylinder 11 is located lower than the opening and where the rod 14 protrudes upward from the cylinder 11 and where central axes of the cylinder 11 and the rod 14 are inclined at the angle between 65° and 75° with respect to the horizontal plane.
In the damper 10, the position of the piston 13 is regulated so that the piston 13 is immersed in the hydraulic fluid Y enclosed below the compressed gas G in the state where the bottom of the cylinder 11 is located lower than the opening and where the rod 14 protrudes upward from the cylinder 11 and where the central axes of the cylinder 11 and the rod 14 are inclined at the angle between 65° and 75° with respect to the horizontal plane. In other words, the piston 13 is not moved into the compressed gas G enclosed to be located above the hydraulic fluid Y in the state where the damper 10 is inclined at the angle between 65° and 75° with respect to the horizontal plane. Consequently, when the damper 10 is extended or contracted, the piston 13 is always moved in the hydraulic fluid Y with the result that the damper 10 can exert a damping force.
Accordingly, the damper 10 of the first embodiment can exert a damping force in the entire stroke range.
Furthermore, the interior of the cylinder 11 is divided by the piston 13 into the rod-side pressure chamber 11B housing the proximal end of the rod 14 and the counter-rod-side pressure chamber 11A. The cylindrical member 15 is disposed between the piston 13 and the rod guide 12 in the rod-side pressure chamber 11A and has the predetermined length along the central axis of the rod 14. As a result, the cylindrical member 15 is interposed between the piston 13 and the rod guide 12 in this damper 10, and when the piston 13 abuts against the cylindrical member 15, further movement of the piston 13 to the rod guide 12 side is disallowed. In other words, the cylindrical member 15 regulates the position of the piston 13 while having a length such that the piston 13 is immersed in the hydraulic fluid Y. Consequently, the damper 10 can exert a damping force with the movement of the piston 13 in the hydraulic fluid Y in the entire stroke range.
The overturn preventing device of a second embodiment differs from the first embodiment in the regulator provided in the damper 110 as illustrated in
The regulator of this overturn preventing device is a bag 115 which is columnar in outer shape and has a central hole extending around a central axis thereof in a direction of the central axis. A gas G is compressed and filled in the bag 115.
The bag 115 is elastically deformable while maintaining a length in the central axis direction. Since the bag 115 is filled with the gas G in a compressed state, one of end surfaces thereof closely contacts the rod guide 12 by a buoyant force and an outer peripheral surface thereof closely contacts an inner peripheral surface of the cylinder 11, with the rod 14 being inserted through the central hole. Thus, the overturn preventing device requires no time and effort to fix the bag 115 serving as the regulator in the rod-side pressure chamber 11B. The bag 115 serving as the regulator is disposed between the piston 13 and the rod guide 12 in the rod-side pressure chamber 11B.
When the damper 110 is contracted so that the piston 13 is moved to the counter-rod-side pressure chamber 11A side with the result that the hydraulic fluid Y in the counter-rod-side pressure chamber 11A flows into the rod-side pressure chamber 11B, the bag 115 serving as the regulator housed in the rod-side pressure chamber 11B is compressed thereby to be reduced in size while maintaining the length in the central axis direction of the rod 14, as illustrated in
The overturn preventing device is mounted between the top surface of the furniture F and the ceiling C so that the bottom of the cylinder 11 is located lower than the opening, so that the rod 14 protrudes upward from the cylinder 11, and so that the central axes of the cylinder 11 and the rod 14 are inclined at the angle between 65° and 75° with respect to a horizontal plane. The bag 115 has the predetermined length along the central axis of the rod 14 and regulates the position of the piston 13 so that the piston 13 is immersed in the hydraulic fluid Y enclosed below the bag 115 filled with the compressed gas G in the state where the central axes of the cylinder 11 and the rod 14 are inclined at the angle between 65° and 75° with respect to the horizontal plane. In other words, when the piston 13 abuts against the bag 115 interposed between the piston 13 and the rod guide 12, further movement of the piston 13 to the rod guide 12 side is disallowed. Accordingly, the bag 115 serving as the regulator also functions as a stopper in the extending operation of the damper 110. Thus, in the damper 110, the bag 115 functions as the stopper and can suppress production of contact noise when the piston 13 abuts against the bag 115. Furthermore, since the piston 13 abuts against the bag 115, dust such as metal bits is prevented from being produced from the piston 13 into the hydraulic fluid Y. Furthermore, when the piston 13 is in abutment against the bag 115, the piston 13 is put in an immersed state in the hydraulic fluid Y. As a result, the damper 110 can exert a damping force with the movement of the piston 13 in the hydraulic fluid Y in the entire stroke range. Furthermore, since the gas is filled in the bag 115 in the compressed state thereby to be separated from the hydraulic fluid Y, the damper 110 can suppress production of bubbles due to the extending/contracting operation thereof.
As described above, the overturn preventing device is mounted between the top surface of the furniture F and the ceiling C with the piston 13 of the damper 110 being immersed in the hydraulic fluid Y. Accordingly, when the furniture is tilted by shaking of earthquake or the like, the damper 110 can exert a damping force in the entire stroke range so that the damping force of the damper 10 can always act on the furniture F, with the result that the furniture F can be prevented from overturn.
Accordingly, the overturn preventing device of the second embodiment can successfully prevent the furniture F from overturn.
Furthermore, in the damper in the second embodiment, the regulator is the bag 115 in which the gas G is filled in a compressed state and which is elastically deformable while maintaining its length in the central axis direction of the rod 14. As a result, the bag 115 is interposed between the piston 13 and the rod guide 12 in this damper, and when the piston 13 abuts against the bag 115, further movement of the piston 13 to the rod guide 12 side is disallowed. In other words, the bag 115 serving as the regulator regulates the position of the piston 13 while having the length such that the piston 13 is immersed in the hydraulic fluid Y. As a result, the damper 10 can exert a damping force with the movement of the piston 13 in the hydraulic fluid Y in the entire stroke range.
The overturn preventing device of a third embodiment differs from the first and second embodiments in the form of the regulator provided in the damper 210 as illustrated in
The regulator of this overturn preventing device is a protrusion 215 protruding inward from an inner surface of the cylinder 211 located nearer to the rod guide 112 side than the housed piston 13. The protrusion 215 is formed by pressing a side surface of the cylinder 211 at a predetermined position from the outside toward the inside and protrudes so as to go around the inner peripheral surface of the cylinder 211 in the circumferential direction. Furthermore, an inner diameter of the part of the cylinder 211 in which part the protrusion 215 is formed is smaller than an outer diameter of the piston 13.
The overturn preventing device is mounted between the top surface of the furniture F and the ceiling C so that the bottom of the cylinder 211 is located lower than the opening, so that the rod 14 protrudes upward from the cylinder 211, and so that the central axes of the cylinder 211 and the rod 14 are inclined at the angle between 65° and 75° with respect to a horizontal plane. The protrusion 215 serving as the regulator is formed at the predetermined position in the cylinder 211 so that the piston 13 is immersed in the hydraulic fluid Y enclosed below the compressed gas G in the state where the central axes of the cylinder 211 and the rod 14 are inclined at the angle between 65° and 75° with respect to the horizontal plane, thereby regulating the position of the piston 13. In other words, when the outer peripheral edge of the piston 13 is locked to the protrusion 215, further movement of the piston 13 to the rod guide 12 side is disallowed. Furthermore, when the outer peripheral edge of the piston 13 is locked to the protrusion 215, the piston 13 is put in an immersed state in the hydraulic fluid Y. As a result, the damper 210 can exert a damping force with the movement of the piston 13 in the hydraulic fluid Y in the entire stroke range.
As described above, the overturn preventing device is mounted between the top surface of the furniture F and the ceiling C with the piston 13 of the damper 210 being immersed in the hydraulic fluid Y. Accordingly, when the furniture F is tilted by shaking of earthquake or the like, the damper 210 can exert a damping force in the entire stroke range so that the damping force of the damper 210 can always act on the furniture F, with the result that the furniture F can be prevented from overturn.
Accordingly, the overturn preventing device of the third embodiment can successfully prevent the furniture F from overturn.
Furthermore, in the damper 210 in the third embodiment, the regulator is the protrusion 215 which protrudes inward from the inner surface of the cylinder 211 located nearer to the rod guide 112 side than the piston 13 and to which the outer peripheral edge of the piston 13 is locked. As a result, in the damper 210, the piston 13 is not allowed to be moved to the rod guide 12 side beyond the protrusion 215 protruding inward from the inner surface of the cylinder 211. In other words, the protrusion 215 serving as the regulator is provided at such a position that the piston 13 is immersed in the operating liquid, thereby regulating the position of the piston 13. As a result, the damper 210 can exert a damping force with the movement of the piston 13 in the hydraulic fluid Y in the entire stroke range.
The overturn preventing device of a fourth embodiment differs from the first to third embodiments in the form of the regulator provided in the damper 310 as illustrated in
The regulator of this overturn preventing device is an annular member which is fixed in the cylinder so as to be located nearer to the rod guide 12 side than the housed piston 13, and is formed with a insertion hole 315A at a center thereof through which the rod 14 is inserted. The annular member 315 has an outer diameter that is slightly smaller than an inner diameter of the cylinder 311. An outer peripheral edge of the annular member 315 is locked to a protrusion 311A which is formed by squeezing a side surface of the cylinder 311 at a predetermined position from the outside toward the inside and protrudes so as to go around the inner peripheral surface of the cylinder 311 in the circumferential direction, whereby the annular member 315 is fixed.
The overturn preventing device is mounted between the top surface of the furniture F and the ceiling C so that the bottom of the cylinder 311 is located lower than the opening, so that the rod 14 protrudes upward from the cylinder 311, and so that the central axes of the cylinder 311 and the rod 14 are inclined at the angle between 65° and 75° with respect to the horizontal plane. The annular member 315 serving as the regulator is fixed at the predetermined position in the cylinder 311 so that the piston 13 is immersed in the hydraulic fluid Y enclosed below the compressed gas G in the state where the central axes of the cylinder 311 and the rod 14 are inclined at the angle between 65° and 75° with respect to the horizontal plane, thereby regulating the position of the piston 13. In other words, when the piston 13 abuts against the annular member 315, further movement of the piston 13 to the rod guide 12 side is disallowed. Furthermore, when the piston 13 is in abutment against the annular member 315, the piston 13 is put in an immersed state in the hydraulic fluid Y. As a result, the damper 310 can exert a damping force with the movement of the piston 13 in the hydraulic fluid Y in the entire stroke range.
As described above, the overturn preventing device is mounted between the top surface of the furniture F and the ceiling C with the piston 13 of the damper 310 being immersed in the hydraulic fluid Y. Accordingly, when the furniture F is tilted by shaking of earthquake or the like, the damper 310 can exert a damping force in the entire stroke range so that the damping force of the damper 310 can always act on the furniture F, with the result that the furniture F can be prevented from overturn.
Accordingly, the overturn preventing device of the fourth embodiment can successfully prevent the furniture F from overturn.
Furthermore, in the damper 310 in the fourth embodiment, the regulator is the annular member 315 which is fixed in the cylinder 311 so as to be located nearer to the rod guide 12 side than the housed piston 13 and which is formed with the insertion hole 315A at the center through which the rod 14 is inserted.
As a result, in the damper 310, the piston 13 is not allowed to be moved to the rod guide 12 side beyond the annular member 315 fixed in the cylinder 311. In other words, the annular member 315 serving as the regulator is fixed at such a position that the piston 13 is immersed in the hydraulic fluid Y, thereby regulating the position of the piston 13. As a result, the damper 310 can exert a damping force with the movement of the piston 13 in the hydraulic fluid Y in the entire stroke range.
The overturn preventing device of a fifth embodiment differs from the first to fourth embodiments in the form of the regulator provided in the damper 410, as illustrated in
The regulator in the overturn preventing device is a flange 415 protruding outward from an outer peripheral surface of the rod 414. The flange 415 is to be locked to a lateral side of the rod guide 12 located at the piston 13 side. A groove 414A is formed to go around the outer peripheral surface of the rod 414 at a predetermined position in the central axis direction, and C-shaped washer 415A having a larger outer diameter than the rod 414 is fitted in the groove 414A, whereby the flange 415 is formed.
The overturn preventing device is mounted between the top surface of the furniture F and the ceiling C so that the bottom of the cylinder 11 is located lower than the opening, so that the rod 414 protrudes upward from the cylinder 11, and so that the central axes of the cylinder 11 and the rod 414 are inclined at the angle between 65° and 75° with respect to the horizontal plane. The flange 415 serving as the regulator is formed at the predetermined position on the rod 414 so that the piston 13 is immersed in the hydraulic fluid Y enclosed below the compressed gas G in the state where the central axes of the cylinder 11 and the rod 414 are inclined at the angle between 65° and 75° with respect to the horizontal plane, thereby regulating the position of the piston 13. In other words, when the flange 415 is locked to the lateral side of the rod guide 12 located at the piston 13 side, further movement of the piston 13 to the rod guide 12 side is disallowed, as illustrated in
As described above, the overturn preventing device is mounted between the top surface of the furniture F and the ceiling C with the piston 13 being immersed in the hydraulic fluid Y. Accordingly, when the furniture F is tilted by shaking of earthquake or the like, the damper 410 can exert a damping force in the entire stroke range so that the damping force of the damper 410 can always act on the furniture F, with the result that the furniture F can be prevented from overturn.
Accordingly, the overturn preventing device of the fifth embodiment can successfully prevent the furniture F from overturn.
In the damper 410 in the fifth embodiment, the regulator is the flange 415 which is to be locked to the lateral side of the rod guide 12 located at the piston 13 side. As a result, in the damper 410, when the flange 415 protruding outward from the outer peripheral surface of the rod 414 is locked to the lateral side of the rod guide 12 located at the piston 13 side, the piston 13 is not allowed to be moved to the rod guide 12 side. In other words, the flange 415 serving as the regulator is provided at such a position that the piston 13 is immersed in the hydraulic fluid Y, thereby regulating the position of the piston 13. As a result, the damper 410 can exert a damping force with the movement of the piston 13 in the hydraulic fluid Y in the entire stroke range.
The present invention should not be limited to the embodiments described above with reference to the drawings, but the technical scope of the invention encompasses the following embodiments, for example.
10, 110, 210, 301, 410 . . . damper; 11, 211, 311 . . . cylinder; 11A . . . counter-rod-side pressure chamber; 11B . . . rod-side pressure chamber; 12 . . . rod guide; 13 . . . piston; 14, 414 . . . rod; 15, 115, 215, 315, 415 . . . regulator (15 . . . cylindrical member, 115 . . . bag, 215 . . . protrusion, 315 . . . annular member, 415 . . . flange); C . . . ceiling; F . . . furniture (article); G . . . gas (compressed gas); and Y . . . hydraulic fluid (operating liquid).
| Number | Date | Country | Kind |
|---|---|---|---|
| 2016-029567 | Feb 2016 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2017/000241 | 1/6/2017 | WO | 00 |
