Liquid level alarm system
US5945913A · kind A · utility
Inventor
Key dates
| Filing date | May 19, 1997 |
| Grant date | Aug 31, 1999 |
| Priority date | — |
| Expiry date | May 19, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/44
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A liquid level alarm system is activated when liquid in a container falls below a predetermined level. The system contains an alarm located outside the container. The alarm is electrically connected to a switching device. The switching device may have a push-down button located on the top, an "on-off" switch located on the side, or a sliding switch located on the side. When the switch is pushed down, the switching device activates the alarm. In one embodiment, the container has a vertically positioned rod adjacent the switching device. There is a float slidably connected to the rod by a connecting rod and hook. The float rises and falls with the level of the liquid. On the side of the rod opposite the float there is a switch contact which makes contact with the switch when the level of the liquid falls below a predetermined level and the float is no longer supported by the liquid. In another embodiment, a float is positioned on tracks so that the switch will be forced down by the float when the liquid level falls below a predetermined point. The tracks contain slots allowing rollers attached to the float to freely rise and fall with the liquid level while maintaining its position r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.