Bi-directional spring device for opening and closing light shiel

Details Bi-directional spring device for opening and closing light shiel Bi-directional spring device for opening and closing light shiel

1996-02-16

1997-06-10

Blankenship, Howard B.

Photography

Camera detail

Detachable or removable film holder unit

396538, G03B 1726

Patent

active

056381522

ABSTRACT:
A bi-directional driver device for opening and closing a light shield of a film cassette is alternately biased open and closed via an overcenter spring, to open and close the light shield. The final opening torque the spring exerts against the driver device when the light shield is completely opened is substantially less than the final closing torque the spring exerts against the driver device when the light shield is completely closed. Thus, the final opening torque will not cause any deformation of the light shield that might allow light leakage into the cassette interior when the light shield is closed.

REFERENCES:
patent: 577593 (1897-02-01), Bronson et al.
patent: 698172 (1902-04-01), Bornmann
patent: 1437989 (1922-12-01), Nelson
patent: 1524081 (1925-01-01), Bornmann
patent: 5231438 (1993-07-01), Smart
patent: 5270757 (1993-12-01), Tosaka et al.
patent: 5319406 (1994-06-01), Takatori
patent: 5357303 (1994-10-01), Wirt
patent: 5359378 (1994-10-01), Zander et al.
patent: 5452038 (1995-09-01), Csaszar et al.
patent: 5495310 (1996-02-01), Takatori

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