Abstract: Provided is a damper that exerts a damping force with a simple structure using elastically deformable granular bodies. The damper includes a cylinder, a piston, a rod, a rod guide, and a plurality of granular bodies. The piston is housed in the cylinder and reciprocates in the central axis direction of the cylinder. The rod is connected to the piston. The rod extends in the central axis direction of the cylinder and protrudes to an outside from an open end side of the cylinder. The rod guide is fixed to the open end of the cylinder. The rod guide has a through hole which penetrates in the central axis direction of the cylinder and through which the rod is reciprocably inserted. The granular bodies are elastic bodies each having a spherical shape. The granular bodies are filled in the cylinder.

Abstract: A damper of the present invention includes: a damping portion that exerts a damping force by using a granular material at a time of extension and contraction; and an elastic portion that exerts an elastic force at the time of extension and contraction, wherein the damping portion is coupled to the elastic portion such that the damping force and the elastic force are exerted in parallel.

Abstract: Providing an overturn preventing device which can be easily mounted between a top surface of a piece of furniture and a ceiling and a method of mounting the overturn preventing device. The overturn preventing device includes a damper and a pair of bases. The damper has a cylinder and a piston slidably housed in the cylinder. The damper is mounted between a top surface of a piece of furniture (article) installed on an installation surface and a ceiling. The paired bases are respectively coupled to two ends of the damper. One of the bases abuts against the top surface of the furniture and the other base abuts against the ceiling. The cylinder has an inlet through which a hydraulic fluid (operating liquid) is poured into the cylinder.

Abstract: Providing an overturn preventing device which can inform in a case where a load applied to a base has changed. The overturn preventing device includes a damper to be mounted between a top surface of an article installed on an installation surface and a ceiling, and a pair of bases respectively coupled to both ends of the damper. One of the bases abuts against the top surface of the article and the other base abutting against the ceiling. The device further includes a shape-changeable part (an informing part) which informs in a case where the base has been subjected to a predetermined load.

Abstract: Providing a damper which exerts 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. The damper includes a cylinder, a rod guide, a piston, a rod, and a cylindrical member. In the damper, a hydraulic fluid and a compressed gas are enclosed in the cylinder. The cylindrical member regulates a position of the piston so that the piston is immersed in the hydraulic fluid enclosed below the gas in a state where a bottom of the cylinder is located lower than an 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.

Abstract: Providing an article equipped with an overturn preventing device, which can add an overturn preventing function to the article itself and can reduce work burdens and management burdens at the time of the mounting. A piece of furniture includes a furniture body to be disposed between an installation surface and a ceiling at a time of installation and an abutting member to be disposed between the ceiling and the furniture body at the time of installation. The furniture further includes an operating part having a damper having two ends one of which is coupled to the furniture body and the other of which is coupled to the abutting member.

Abstract: Providing an overturn preventing device which can maintain a mounted state against earthquake or the like with multidirectional shaking and thereby can prevent an article from overturn. The overturn preventing device includes a damper and a pair of bases. The damper is mounted between a top surface of a piece of furniture installed on a floor and a ceiling. Both ends of the damper are respectively coupled to the bases so as to be rotatable about respective rotation axes. Furthermore, both ends of the damper are respectively coupled to the bases so as to be swingable in a direction intersecting a rotation direction. The first base abuts against the top surface of the furniture and the second base abuts against the ceiling.

Abstract: Providing an overturn preventing device which can easily be mounted between a top surface of an article and a ceiling and a method of mounting the overturn preventing device. The overturn preventing device includes a damper. The damper is mounted between a top surface of a piece of furniture (an article) and a ceiling. The damper includes a cylinder and a piston. A hydraulic fluid (operating liquid) and a compressed gas are enclosed in the cylinder. The piston is slidably housed in the cylinder. When the damper is to be mounted between the top surface of the furniture and the ceiling, the piston is housed in the compressed gas enclosed above the hydraulic fluid. The piston can be moved into the hydraulic fluid when the furniture is tilted and the damper is contracted by a predetermined length.

Abstract: Providing an overturn preventing device in which a plurality of dampers can be mounted between a top surface of an article and a ceiling and which can suppress increase in working man-hour and increase in an installation space. The overturn preventing device includes a plurality of dampers mounted between a top surface and a piece of furniture installed on an installation surface and a ceiling. The dampers each have first and second ends and all of the first ends are coupled to the article-side base. The second ends of the dampers are coupled to one or a plurality of ceiling-side bases.

Abstract: Providing an overturn preventing device which has can successfully prevent an article from overturn with a simple structure. A damper of the overturn preventing device has a cylinder, a rod, and a spring. The cylinder is mounted between a top surface of a piece of furniture installed on an installation surface and a ceiling so that a direction of extension/contraction makes a predetermined angle relative to a vertical direction. The cylinder has two ends one of which is open to be formed into an opening and the other of which is closed to be formed into a bottom. The rod is inserted into the cylinder and has a distal end protruding from the opening. The spring is provided between a proximal end of the rod and the bottom of the cylinder. Two bases are rotatably coupled to the bottom of the cylinder and the distal end of the rod, respectively, and the bases abut against the top surface of the furniture and the ceiling, respectively.

Abstract: Providing an overturn preventing device which can easily be mounted between a top surface of a piece of furniture and a ceiling while an axis line of a damper relative to a vertical direction is inclined at an angle ranging from 15° to 25°. The overturn preventing device includes a damper, a first base portion and a second base portion. The first base portion has a first abutting surface and a first connection. The first base portion is mounted on the top surface of the furniture. The second base portion has a second abutting surface and a second connection. The second base portion is mounted on the ceiling. A relation, X+L sin 15°?Y?X+L sin 25°, is obtained where reference symbol X designates a distance from the first abutting surface to the first connection, reference symbol L designates a length of the damper and reference symbol Y designates a distance from the second abutting surface the second connection.

Abstract: Providing an overturn preventing device which can successfully prevent overturn of an article. The overturn preventing device includes a damper mounted between a piece of furniture and a ceiling and a setting member connected to both ends of the damper. The setting member has a first setting part body and a second setting part body. The first and second setting part bodies and of the setting member are spread when the overturn preventing device is mounted between the furniture and the ceiling. The setting member assumes such a shape as to extend in one direction when the first and second setting part bodies and are unspread.

Abstract: A driving assist unit of a truck for assisting a driving force applied to the truck by a worker includes a unit body connected to the truck, the unit body being turnable with respect to the truck, an operation portion provided on the unit body, the operation portion being configured to input a driving force to the truck through the unit body by being pressed by the worker, a driving wheel provided on the unit body, the driving wheel being rotatable in a longitudinal direction of the unit body, an assist force according to the operation of the operation portion being applied to the driving wheel, a lower engagement mechanism configured to be engaged with the truck by pressing the unit body onto the truck, and an upper engagement mechanism provided above the lower engagement mechanism and configured to be engaged with the truck by fitting of a locking member by the worker.

Abstract: Providing a vibration damping shelf which can suppress fall of articles placed on a shelf member while suppressing shake of other articles or the like. The vibration damping shelf includes a damper and shelf plates. The damper has two ends mounted, on a top surface of a piece of furniture and a ceiling spaced from each other in an up-down direction. The shelf plates are held on the damper.

Abstract: Providing an overturn preventing device which can easily be mounted and can prevent articles from overturn. The overturn preventing device includes an abutting part and a connecting part. The abutting part abuts against a ceiling. The abutting part is disposed so as to extend in one direction while gradually departing from the ceiling. The connecting part has two ends one of which is connected to an end of the abutting part away from the ceiling and the other of which is disposed on a top surface of a piece of furniture. The abutting part is elastically deformed with tilt of the furniture, so that an area of a part of the abutting part abutting against the ceiling is increased.

Abstract: Providing an overturn preventing device which can be mounted to an article such as furniture irrespective of an installation location of the article and which can prevent the article from being overturned by quakes of an earthquake or the like. The overturn preventing device includes a plurality of dampers mounted between a top surface of the furniture installed on a floor surface and a ceiling. The dampers are compression damper that has a smaller damping force generated during an extending operation than a damping force generated during a compressing operation. The dampers have respective axis lines extending from a ceiling side to the top surface side of the furniture, and the axis lines are downwardly inclined and extend in a plurality of directions in a planar view as viewed from above when the dampers are mounted between the top surface of the furniture and the ceiling.

Abstract: Providing an overturn preventing device which can successfully prevent overturn of an article. The overturn preventing device includes a damper mounted between a piece of furniture and a ceiling and a setting member connected to both ends of the damper. The setting member has a first setting part body and a second setting part body. The first and second setting part bodies and of the setting member are spread when the overturn preventing device is mounted between the furniture and the ceiling. The setting member assumes such a shape as to extend in one direction when the first and second setting part bodies and are unspread.

Abstract: Providing an overturn preventing device which can easily be mounted between a top surface of a piece of furniture and a ceiling while an axis line of a damper relative to a vertical direction is inclined at an angle ranging from 15° to 25°. The overturn preventing device includes a damper, a first base portion and a second base portion. The first base portion has a first abutting surface and a first connection. The first base portion is mounted on the top surface of the furniture. The second base portion has a second abutting surface and a second connection. The second base portion is mounted on the ceiling. A relation, X+L sin 15°?Y?X+L sin 25°, is obtained where reference symbol X designates a distance from the first abutting surface to the first connection, reference symbol L designates a length of the damper and reference symbol Y designates a distance from the second abutting surface the second connection.

Abstract: A caster unit includes a base member attached to a mobile body; a link mechanism rotatably supported by the base member to be capable of swinging up and down; an axle supported by the link mechanism; and a support mechanism provided between the axle and the base member, the support mechanism being configured to extends/contracts in a direction parallel to a tangent line of a trajectory of the axle that swings by the link mechanism to generate a damping force and a restoring force.

Abstract: A driving assist unit of a truck for assisting a driving force applied to the truck by a worker includes a unit body connected to the truck, the unit body being turnable with respect to the truck, an operation portion provided on the unit body, the operation portion being configured to input a driving force to the truck through the unit body by being pressed by the worker, a driving wheel provided on the unit body, the driving wheel being rotatable in a longitudinal direction of the unit body, an assist force according to the operation of the operation portion being applied to the driving wheel, a lower engagement mechanism configured to be engaged with a connecting rod, the connecting being provided protruding to an outside from the truck and perpendicularly with respect to a ground, the lower engagement mechanism being slidable in an axial direction with respect to the connecting rod, and an upper engagement mechanism provided above the lower engagement mechanism and configured to be engaged with the connec