Explosion-proof and fog-free day and night outside rear view mirror incorporating variable position actuator
US4560250A · kind A · utility
Inventor
Key dates
| Filing date | Sep 3, 1982 |
| Grant date | Dec 24, 1985 |
| Priority date | — |
| Expiry date | Sep 3, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/1827
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A housing, which is secured for pivoting or biased in a frame by a manual actuated sheathed cable extending from inside the cab, supports a glass sealed at an angle in front of a mirror and heater which aids in defrosting the front of the glass and provides for viewing of a bright reflection or dim image. The housing encloses in dry vapors a mirror, a heater, and a vapor-proof collapsible bag sealed to tubular electrical conduits which are sealed through the housing to provide a passage out into the atmosphere. The electrical conduits supply electrical current through the housing from the battery to the heater. The dry vapors' temperature determines the pressure and space the vapor-proof expandable or collapsible sealed bag occupies in the housing allowing the atmospheric pressure to control the dry vapor pressure and thus prevent explosion or vacuum effect. These predetermined conditions result in an all-weather outside rear view mirror.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.