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 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 prevent an article from overturn while maintaining the mounted state against an earthquake or the like with multidirectional shaking. The overturn preventing device includes a damper and a pair of a first base and a second base. The damper is mounted between a top surface of a piece of furniture installed on a floor and a ceiling. Two ends of the damper are respectively coupled to the first and second bases so as to be swingable in multiple directions. 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 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: 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 damper that includes a piston reciprocally movable in a cylinder thereby dividing an interior of the cylinder into a first chamber located at an open end side and a second chamber located at a closed end side, a piston rod having a distal end to which the piston is connected and a rear end side protruding outward from the open end of the cylinder, a rod guide fixed to the open end of the cylinder and having a through hole through which the piston rod is reciprocally movable, and a seal which is provided in the rod guide so as to be located at a position spaced away from an outer end of a sliding surface of the through hole to the first chamber side by a distance longer than a maximum stroke width of the piston rod.