Non-backdriving actuator for opening and closing a window sash
US4860493A · kind A · utility
45Cited by
5References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 10, 1988 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Nov 10, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/148
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A shaft of a window actuator is operable to open and close a casement window sash when the shaft is rotated either by a hand crank or by a motor from inside of the premises. The shaft is automatically locked against rotation if a backdriving force is applied to the actuator from outside the premises. This prevents an open sash from being buffeted by wind and from being pulled open further by a potential intruder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.