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:
Feb. 02, 1982
Filed:
Nov. 29, 1979
Horst Stahl, Weidach, DE;
Walter Wachs, Krailling, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
A push-button key switch for keyboards, having an actuating member, and a helical spring which functions as a return spring for the actuating member and as a movable contact element. The helical spring comprises two sections, one of which is employed as the return spring, and which engages a seating surface on the actuating member. The other section of the spring extends beyond the seating surface and is adapted to engage a cooperable stationary counter-contact upon actuation of the actuating member. The switch may be readily designed as a single pole-single throw switch or a single pole-double throw switch, and may be designed to provide predetermined contact pressures between closed contacts.