Belt drive shutter device

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G03B 922

Patent

active

055349617

ABSTRACT:
A coupling device for controlling the shutter blades of a leaf type shutter. The coupling device includes two or more hubs that are each coupled to a shutter blade and a portion of a base and a continuous belt that is in contact with the hubs so that when the hubs rotate in a first direction the shutter blades will open and when the hubs rotate in a second direction the shutter blades will close.

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patent: 2969142 (1961-01-01), Mack
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patent: 4531820 (1985-07-01), Petersen
patent: 4558937 (1985-12-01), Petersen et al.
DataBase WPI, Section PQ, Week 8931, Derwent Publications Ltd., London, GB; AN 89-226164 & SU-A-1 437 826 (Belorussian Poly), 15 Nov. 1988, abstract.
DataBase WPI, Section PQ, Week 8704, Derwent Publications Ltd., London, GB, AN 87-028529, & SU-A-1 236 414 (Belorussian Poly), 7 Jun. 1986, abstract.

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