Damper comprising rotor shaft and gear sleeve having equal external diameter portions with clutch spring wound thereabout
US4830151A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 1988 |
| Grant date | May 16, 1989 |
| Priority date | — |
| Expiry date | Apr 25, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A damper for damping rotation has a construction in which a rotor having a braking plate immersed in oil disposed within a casing and a gear are coupled together by a means of a clutch spring in the form of a coil spring. When the gear is rotated in one direction, it is coupled with the rotor as a result of diametrical contraction of the spring, and a restoring force is stored within the clutch spring, thus producing a resistance against rotation. When it is rotated in the opposite direction, the restoring force of the clutch spring is released so as to permit free rotation of the gear. The coil spring is coiled about a shouldered portion of the rotor shaft and a lower portion of a gear sleeve, supporting the gear, which have the same diametrical extent. In this manner, projecting end portions of the spring, upon which excessive loads have been impressed within the prior art, are able to be eliminated thereby providing extended service life to the spring and damper assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.