Mechanism for opening and closing a film chamber of a photograph

Details Mechanism for opening and closing a film chamber of a photograph Mechanism for opening and closing a film chamber of a photograph

1997-03-24

1998-05-12

Lee, Eddie C.

Photography

Camera detail

Body structure or housing

396538, G03B 1702

Patent

active

057521204

ABSTRACT:
An opening/closing mechanism for a lid designed to be operated when it is desired to load or unload a cartridge or the like carrying a roll of film therein into or from a photographic camera of such a type that the cartridge or the like is loaded into or unloaded from the camera in a direction corresponding to an axis of the cartridge or the like or a spool thereof. This novel mechanism is constructed so that a lid locking member is kept in unmovable engagement with an opening/closing control member which is rotated under it's own gravity and thereby said lid locking member cannot be rotated without being disengaged from the opening/ closing control member and the lid being in engagement therewith is reliably prevented from being unintentionally opened unless the camera is turned upside down. In this manner, this opening/closing mechanism reliably prevents the cartridge or the like from unexpectedly falling out from the camera during operation of film exchange. More specifically, the lid 2 is locked by a locking lever 10 which is, in turn, locked by a control lever 30. This control lever 30 is supported rotatably around a pivot pin 30a so as to be rotated under a gravity of a weight 31 attached to a forward end of the control lever 30 every time the camera 1 is turned upside down or vice versa. The control lever 30 is kept in engagement with the locking lever 10 and prevented from rotating around a pivot pin 10a therefore, from being disengaged from the lid 2 so long as the camera 1 stands upright, whereas the control lever 30 is disengaged from the locking lever 10 and allowed to rotate, i.e., the lid 2 is allowed to be opened as the camera 1 turned upside down.

REFERENCES:
patent: 4870437 (1989-09-01), Omaki et al.
patent: 5142316 (1992-08-01), Tanii et al.
patent: 5258793 (1993-11-01), Tsuji et al.
patent: 5432575 (1995-07-01), Funahashi
patent: 5473401 (1995-12-01), Tsunefuji

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