Film cassette with spool lock and light-shielding door

Details Film cassette with spool lock and light-shielding door Film cassette with spool lock and light-shielding door

1993-03-22

1994-05-31

Gellner, Michael L.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242 711, G03B 1726

Patent

active

053173554

ABSTRACT:
A film cassette comprises a light-shielding door for preventing ambient light from entering the cassette interior, a film spool supported for rotation in film unwinding and film winding directions, and a locking device supported for movement into engagement with the spool to secure the spool and out of engagement with the spool to release the spool. According to the invention, the door is supported for closing movement to prevent ambient light from entering the cassette interior and for opening movement, and includes a cam for moving the locking device into engagement with the spool responsive to closing movement of the door. Also, the locking device is resilient to permit it to be temporarily deformed should it be obstructed from being moved by the cam to engage the spool and the light-shielding door is forcibly closed, or should it be engaging the spool and the spool is forcibly rotated in the film unwinding and winding directions.

REFERENCES:
patent: 2731894 (1956-01-01), Leitz et al.
patent: 4221479 (1980-09-01), Harvey
patent: 4225034 (1980-03-01), Harvey et al.
patent: 4938429 (1990-07-01), Robertson et al.
patent: 4962401 (1990-10-01), Takahashi
patent: 5030978 (1991-07-01), Stoneham et al.
patent: 5049912 (1991-09-01), Pagano et al.
patent: 5115268 (1992-05-01), Kitagawa et al.
patent: 5200777 (1993-04-01), Zander

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