Film cassette with spool core having fastening hook

A film cassette comprising interior means, including a spool core about which a filmstrip is coiled, for thrusting a leading end portion of said filmstrip from inside to outside said cassette responsive to rotation of said spool core in an unwinding direction and permitting the filmstrip to be wound onto the spool core when the spool core is rotated in a winding direction, in characterized in that:

• said filmstrip has a trailing end portion with a hole in it;
• and
• said spool core includes a double-hook piece having first hook means projecting through the hole in the unwinding direction to slightly overlie said trailing end portion to engage the trailing end portion for pushing the filmstrip off the spool core to thrust said leading end portion outside said cassette when the spool core is rotated in the unwinding direction, but which will exit the hole as the trailing end portion begins to separate from the spool core when the spool core is rotated in the unwinding direction, and second hook means, relatively longer than first hook means, projecting through the hole int he winding direction to substantially overlie the trailing end portion to engage the trailing end portion for preventing the trailing end portion from completely separating from the spool core when the first hook means is removed from the hole, but which can be backed out of the hole by rotating the spool core relative to the trailing end portion in the unwinding direction after the first hook means is removed from the hole.