Film sheet presence indicating mechanism for a photographic cassette
US4807271A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1987 |
| Grant date | Feb 21, 1989 |
| Priority date | — |
| Expiry date | Nov 25, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B42/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A film sheet presence indicating mechanism is disclosed for use in a photographic cassette, such as an x-ray cassette having one end wall with a slot therein through which a film sheet is moveable therethrough between screens along an inlet path to a loaded position adjacent an opposite end wall. The x-ray cassette has front and rear cover walls joined to the end walls in which the rear cover wall has an inner side facing an inner surface of the front cover. The film sheet presence indicating mechanism comprises a housing secured to the inner side of the rear cover adjacent the opposite end wall to define a cavity. The mechanism further comprises a film sheet presence indicator member that is mounted within the housing cavity for slidable movement between a normal first position indicating the absence of a film sheet in the x-ray cassette, and a second position indicating that a film sheet is loaded in the cassette.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.