Miniature rotary timer
US4773050A · kind A · utility
0Cited by
3References
15Claims
0Family size
Inventor
Key dates
| Filing date | Oct 9, 1987 |
| Grant date | Sep 20, 1988 |
| Priority date | — |
| Expiry date | Oct 9, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B3/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A viscous fluid timer is constructed with a cylindrical cavity formed by a housing that supports an axially aligned rotor unit having a rotor on a shaft within a first chamber filled with a viscous fluid. The first chamber communicates with a second chamber having a shaft seal through which the rotor shaft projects, the rotor shaft having a torsional connection to a spring means for rotating the rotor unit within the chamber, the first chamber being filled with a highly viscous fluid which impedes the rotation of the rotor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.