| 摘要 |
PURPOSE: The hydraulic hinge for a front door is provided to adjust the slight movement and the angle of a front door by a hydraulic pressure. CONSTITUTION: The hydraulic hinge for a front door is composed of: the first supporting plate(5) containing a hollow pipe(4) with a fixing plate(1) joined to a door frame and partially threaded inner face necessary to join a lower cover(10) and an upper one(24); a lower cover(10) joined with the hollow pipe by screws; a hydraulic unit(25) installed inside the hollow pipe and containing a cylinder(11), a piston(15) connected to the inside of the cylinder and regulating the oil flow, a screw nut(20) moving up and down along a guide groove(3) and a shaft(23) controlling the movement of the screw nut; the second supporting plate(30) joined to the hollow pipe and rotating right and left by a sliding bush; a hydraulic pressure control unit(40) regulating the movement range of the hydraulic unit; a guide spring(3a) preventing the aluminum hollow pipe from being worn by the repeated movement of a screw nut(20).
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