Water-flow detector with rapid switching
US4782333A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 23, 1987 |
| Grant date | Nov 1, 1988 |
| Priority date | — |
| Expiry date | Mar 23, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8242
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cylindrical shuttle having a cone-shaped cam surface on one end which slides freely on a timer shaft between a first stop and a second stop which are attached to the shaft. A vane arm driven by a water vane engages the side of the first stop opposite the shuttle. In the normal (no-flow) condition, the vane return spring presses the vane arm against the first stop, which in turn forces the shuttle cam surface against the plungers of two microswitches on either side of the timer shaft, causing the plungers to ride up the cam surface to rest on the shuttle. When water flows, the vane arm releases the first stop and the timer shaft begins to move. After the shaft moves the free distance between the second stop and the shuttle, the second stop engages the shuttle and forces it out from under the plungers. When the plungers reach the cam surface, the shuttle cams out from under the plungers allowing them to release freely and rapidly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.