| 摘要 |
<p>PURPOSE:To enable the opening and closing motion of an opening and closing structure to be damped by simple construction, by providing a rotary cylinder, which rotates in both normal and reverse directions being damped by a damper a gear and has, and a spring accumulating restoring force. CONSTITUTION:A rotary cylinder 4 having a gear 5 is rotatably mounted while a shaft 7 of a damper 6 is unrotatably mounted by fitting a noncircular part 7' to a noncircular hole 1' to a mounting base plate 1 fixed to a cassette cover or the main unit of an equipment for use. A spring 3, inserting its internal end 3a into a slit 7a of the damper shaft 7 while placing a protrusive stripe 3b of the external end of the spring 3 in a groove 2b of a holding cylinder 2, is mounted. While the holding cylinder 2 is unrotatably mounted to the rotary cylinder 4. Then restoring force of the spring 3 is given to the rotary cylinder 4 through the holding cylinder 2. A damping plate 8 of the damper 6 is provided in oil 12 of large resistance of viscosity, damping a rotary motion of the rotary cylinder 4.</p> |
