Rotary paddle level switch
US9111704B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2013 |
| Grant date | Aug 18, 2015 |
| Priority date | — |
| Expiry date | Feb 3, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H35/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A rotary paddle level switch has a housing, a driving unit, two switches, a resilient member, a clutch, a transmission shaft, and a propeller. A resilient clip of the clutch holds a non-circular actuation section of the transmission shaft. When the driving unit drives the clutch to rotate, the transmission shaft and the propeller are driven by the clutch. When the propeller is rapidly rotated by suddenly exerting an excessively large external force thereon, as the resilient clip holds the transmission shaft by elastic force, the fast rotating transmission shaft removes itself from the holding of the resilient clip and is rotated without driving the resilient clip to rotate, thereby avoiding the transmission of the external force and damage to the driving unit. As the clutch just needs a clutch stand and a resilient clip to achieve the foregoing function, the level switch is structurally simple and relatively inexpensive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.