The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 02, 1985
Filed:
Sep. 22, 1983
Kenneth J Launie, Cambridge, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
A camera having a film counter for indicating the number of unexposed film units remaining in the camera. The film counter includes a rotatably mounted drum having a single row of teeth by which the drum may be sequentially indexed in a first direction subsequent to the exposure of a film unit. A pawl having first and second working surfaces limits rotation of the drum in a second direction thereby maintaining the drum in its newly indexed position. By removing one of the teeth, the second working surface is able to move into the space created by the removed tooth and into the path of movement of one of the teeth during rotation of the drum in the second direction to thus stop the drum in its newly indexed position. Thus, the second working surface obviates the need for a second pawl and/or a second row of teeth while removal of the tooth from the row prevents the drum from being further indexed in the first direction when the supply of film has been exhausted, thus preventing overwinding of its return spring.