Battery sensing mechanism
US5055830A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1989 |
| Grant date | Oct 8, 1991 |
| Priority date | — |
| Expiry date | Jun 12, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/181
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A smoke detector with a visual battery missing indicator and a removable cover includes first and second locking prongs molded in the detector and directed toward the cover. A battery is positionable between the first and second locking prongs deflecting same from a non-locking position to a locking position. In the locking position, free ends of the prongs can engage the cover, locking same to the detector. In the non-locking position, the prongs are not effective to engage the cover. If the detector is mounted on a ceiling, the non-engaged cover will not remain closed. In an alternate embodiment usable with a bracket mounted detector, a depressible blocking member is located adjacent a region where the detector is normally coupled to a portion of the bracket. In the presence of a battery this member is retracted, enabling the unit to be attached to the bracket. In the absence of a battery, this member is extended and the detector cannot be attached to the bracket.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.