Patent ID: 6464052
Filing Date: 2002-10-15
Classification: E05F,E05Y,F16F

Abstract:
A rotatable hydraulic damper comprising:a tubular fixed member having spiral grooves defined in an inner periphery thereof, the fixed member having an open end; a shaft having a passage defined longitudinally therethrough and including a first section and a second section with a flange extending radially outward from the shaft and located between the first section and the second section, a plurality of radial holes defined radially through the second section and communicating with the passage, a first seal bolt sealing the passage at a distal end of the first section, a spring and a bead received in the passage in the second section and the bead urged by the spring and sealing the passage at a distal end of the second section, the second section of the shaft rotatably received in the fixed member via the open end of the fixed member and the open end of the fixed member contacting the flange; a movable sleeve movably mounted to the second section of the shaft and located between the inner periphery of the fixed member and the second section of the shaft, a plurality of longitudinal grooves defined in an inside of the sleeve, a plurality of spiral teeth defined in an outer periphery of the sleeve and engaged with the spiral grooves of the fixed member, and a cap having a hole and the fist section extending through the hole in the cap and an inside of the cap contacting the flange, the cap fixedly connected to the open end of the fixed member.