Flat torque rate drive system

Details Flat torque rate drive system Flat torque rate drive system

1974-11-18

1976-04-27

Herrmann, Allan D.

Motors: spring, weight, or animal powered

Composite

Spring only

354158, 354187, F03G 100, G03B 1912

Patent

active

039528359

ABSTRACT:
The subject invention provides reflex photographic apparatus incorporating an operator reflex assembly which is moved during a photographic cycle to convert an optical path from a viewing-focusing mode configuration to an exposure mode configuration. Spring means are utilized to drive the assembly, via a four-bar linkage, from the viewing mode position to an exposure mode position quickly and whilst minimizing elastic rebound at the termination of the movement. Motor means are utilized to return the assembly to the viewing mode position following a photographic exposure. The spring means includes a low-rate torsion spring acting in concert with a tension spring connected between a frame member and an eccentric such that the combined torque operative to drive the operator reflex assembly remains nearly constant. Such a so-called "flat-torque" characteristic enables an improved efficiency match with the other components of the operator assembly moving mechanism and further functions to prevent undesired oscillation of the operator assembly upon reaching the exposure mode configuration.

REFERENCES:
patent: 3194343 (1965-07-01), Sindlinger
patent: 3673935 (1972-07-01), Coughlan
patent: 3731608 (1973-05-01), Shenk
patent: 3735684 (1973-05-01), Coughlan

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