Power opener with manual override
US4137796A · kind A · utility
8Cited by
4References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1978 |
| Grant date | Feb 6, 1979 |
| Priority date | — |
| Expiry date | Mar 3, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/55
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A mechanism which normally is driven by a motor, but which can be safely manually driven by a hand crank or the like in case of a power shortage or other emergency. The mechanism has a power-driven drive gear and a driven assembly which preferably includes a gear-like member, such as a worm, and a crank-receiving member, such as an internally splined hub. A disconnecting assembly which is responsive to engagement of the hand crank in the crank-receiving member is provided to disconnect the driven assembly from the power-driven drive gear.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.