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:
Sep. 20, 1977
Filed:
May. 20, 1976
Pak-Jong Chu, Ottawa, CA;
Jacques Marcel Audette, Ottawa, CA;
Northern Telecom Limited, Montreal, CA;
Abstract
A pushbutton dial has a cover, a back member and a circuit member assembled in a sandwich formation, the cover supporting a plurality of pushbuttons arranged in columns and rows. Longitudinal and transverse shafts are mounted between, the cover and back member, actuation of a pushbutton rotating a unique pair of longitudinal and transverse shafts. Frequency contacts are mounted on the back surface of the circuit member - usually a printed circuit board - and are actuated by pins passing through the back member and the circuit member one end of each pin in engagement with one set of frequency contacts and the other end of each pin in contact with a lever on one of the longitudinal shafts or one of the transverse shafts. The dial can also be provided with a new form of common switch comprising a series of cantilevered spring contacts mounted side by side and actuated by a cam member in a predetermined sequence.