| 摘要 |
An actuator including a worm gear mechanism 11, bearing means 15 and 16 that permits limited axial movement of shaft 14 relative to the housing 13 in response to axial loading of the shaft. The actuator being characterised by co-operable first and second breaking components (32, 15b; 33, 16b) wherein the first of the components 32, 33 rotates with the shaft 14 and a second of the components 15b is fixed with respect to the housing 13. One of the breaking components having an internal frusto-conical surface 32b and the other braking component having a corresponding external frusto-conical surface 32a, the frusto-conical surfaces being inter-engageable by axial movement of the shaft 14 from an axial rest position. |
