Film cassette with spool lock
First Claim
1. A film cassette adapted to be opened and closed comprising a film spool supported for rotation, and movable locking means for inhibiting rotation of said film spool when said cassette is closed and allowing the film spool to rotate when the cassette is opened, is characterized in that:
- retaining means keeps said movable locking means in place to make it inhibit rotation of said film spool when said cassette is opened, but allows the film spool to be initially forcibly rotated to move the locking means out of place to then allow the film spool to be freely rotated, whereby the film spool must be rotated to discontinue the affect of the locking means after the cassette is opened.
1 Assignment
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Accused Products
Abstract
A film cassette adapted to be opened and closed comprises a film spool supported for rotation, and a lock for inhibiting rotation of the film spool when the cassette is closed and allowing the film spool to rotate when the cassette is opened. According to the invention, a retainer keeps the lock in place to make it inhibit rotation of the film spool when the cassette is opened, but allows the film spool to be initially forcibly rotated to move the lock out of place to then allow the film spool to be freely rotated. Thus, the film spool must be rotated to discontinue the affect of the lock after the cassette is opened.
20 Citations
10 Claims
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1. A film cassette adapted to be opened and closed comprising a film spool supported for rotation, and movable locking means for inhibiting rotation of said film spool when said cassette is closed and allowing the film spool to rotate when the cassette is opened, is characterized in that:
retaining means keeps said movable locking means in place to make it inhibit rotation of said film spool when said cassette is opened, but allows the film spool to be initially forcibly rotated to move the locking means out of place to then allow the film spool to be freely rotated, whereby the film spool must be rotated to discontinue the affect of the locking means after the cassette is opened. - View Dependent Claims (2, 3, 4)
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5. A film cassette comprising a film spool supported for rotation, a spool lock supported for movement into engagement with said film spool to secure the film spool and out of engagement with the film spool, and actuation means for moving said spool lock into engagement with said film spool and holding the spool lock engaged with the film spool, is characterized in that:
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said actuation means is retractable from said spool lock to release the spool lock from being held engaged with said film spool to permit the spool lock to be disengaged from the film spool; said film spool includes integral means for disengaging said spool lock from the film spool responsive to rotation of the film spool when said actuation means has released the spool lock; and retaining means holds said spool lock engaged with said film spool even though said actuation means has released the spool lock, but allows the spool lock to be disengaged from the film spool responsive to rotation of the film spool. - View Dependent Claims (6, 7, 8, 9, 10)
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Specification