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:
Jul. 11, 1989
Filed:
Nov. 03, 1987
Edwin R Newell, Fletcher, NC (US);
Simon S Smith, Jr, Fairview, NC (US);
Square D Company, Palatine, IL (US);
Abstract
A limit switch includes a housing which encloses a snap switch having first and second pairs of spaced fixed contacts and first and second movable contacts supported on a carrier and operated by first and second reciprocating plungers that are biased to a first position. Toggle springs are interposed between the respective plungers and the carrier to move the carrier and the associated contacts between fixed pairs of fixed contacts during reciprocation of the respective plungers. An actuator head is mounted on the switch housing and has cams for actuating the respective plungers. In one preferred embodiment, the actuator head has a pair of concentric actuator elements that are respectively moved by first and second cams mounted on a shaft and configured so that rotation of the shaft in one direction will actuate one plunger, while rotation of the shaft in the opposite direction will operate the second plunger, thereby producing a neutral position for the limit switch in either direction of movement of the actuating shaft.