| 摘要 |
A precompressed spring assembly suitable for a single acting pneumatically controlled semi-rotating actuator, comprises a compression coil spring (1) having extension limiting means (4,5,8) for limiting the elongation of the spring to a value less than its natural length and greater than but close to the maximum elongation in use. The extension limiting means are constituted by spring cups (4,5) engaging, respective ends of the spring (1) and carried slidably on a pin (8) which also has means (9) for limiting the travel of the spring cups (4,5). |
