Patent ID: 7628257
Filing Date: 2009-12-08
Classification: F16F

Abstract:
1. A hydraulic damper comprising: a cylinder, said cylinder having a front opening in a front end thereof and a rear opening in a rear end thereof; a front cap sealed to the front opening of said cylinder; a rear cap sealed to the rear opening of said cylinder, said rear cap having a center axle hole a hydraulic fluid filled in said cylinder; a piston rod, said piston rod having a rod body inserted through the center axle hole of said rear cap and extending out of said cylinder, a pin axially extending from one end of said rod body and suspending inside said cylinder, and a retainer affixed to said pin remote from said rod body; a rigid valve block coupled to said pin and stopped against one end of said rod body of said piston rod, said rigid valve block having a diameter smaller than the inner diameter of said cylinder and a plurality of through holes axially extending through front and rear sides thereof; and a piston molded from plastics and mounted on said pin and axially movable along said pin between said retainer and said rigid valve block, said piston having an outer diameter smaller than the inner diameter of said cylinder, a plurality of through holes and slots axially extending through front and rear sides thereof, a plurality of spring strips respectively suspending in said slots, said spring strips each having a free end and a raised portion protruded from said free end suspended to extend out of said piston toward said rigid valve block and be stopped against said rigid valve block.