Patent ID: 8510911
Filing Date: 2013-08-20
Classification: E05D,E05F,E05Y,Y10T

Abstract:
1. A hinge for automatically-closing a door which opens in both directions comprising: a cylinder; an operating rod attached to one end of the cylinder so as to be rotatable and restricted from moving in the longitudinal direction; two substantially V-shaped grooves provided on an outer periphery of the operating rod in the cylinder so as to oppose to each other; two spheres provided so as to engage the substantially V-shaped grooves and disposed so as to oppose to each other; a piston engaged with the spheres and moved in the cylinder in the longitudinal direction in conjunction with the movement of the spheres with respect to the substantially V-shaped groove; a compression coil spring disposed between the piston and an upper end portion of the cylinder and configured to urge the piston to the other end side of the cylinder; and a fluid pressure shock absorbing mechanism configured to absorb a shock caused by the movement of the piston to the other end side with a liquid pressure.