Patent · US Expired

Cassette for band material

US4351497A · kind A · utility

4Cited by

5References

9Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Werner Kiessling · Unterschleißheim, DE
Otto Wiedemann
Peter Lau · Taipei, TW
Gabriel Vondrovsky · Munich, DE

Key dates

Filing date	Feb 10, 1981
Grant date	Sep 28, 1982
Priority date	—
Expiry date	Feb 10, 2001

Classification

Technology area (CPC G)Physics
CPC primaryG03B17/265
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A motion-picture film cassette has a pay-out spool and a take-up spool mounted coaxially, but at opposite sides of a divider wall. Film travels in one direction through the wall from the pay-out spool to the take-up spool. An anti-reversing device is provided to prevent reverse movement of the film and/or spools; it includes an annulus of holes in the wall, surrounding the axis of the spools, and a resiliently yieldable finger projecting from that surface of the take-up spool which faces the wall. The finger ratchets over the holes when the take-up spool turns in take-up direction but engages in a respective one of the holes to block reverse movement when the take-up spool attempts to turn in the opposite direction.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.