| 摘要 |
A rotatable hydraulic damper includes a tubular fixed member and a shaft has a section rotatably received in the fixed member. A sleeve is rotatably engaged with the inner periphery of the fixed member and mounted to the section of the shaft. A passage is defined longitudinally through the shaft and a cap is mounted to the section of the shaft and seals the open end of the fixed member. Two chambers are respectively defined in the fixed member and separated by the sleeve. A plurality of longitudinal grooves are defined in an inside of the sleeve and an end of the sleeve is sealed by a bead urged by a spring. The hydraulic oil in the two chambers flows through the sleeve at different speeds so that the pivotable object closes slower than it is opened.
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