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:
Aug. 07, 2001
Filed:
Dec. 31, 1999
Edward I. Engel, Hamilton, OH (US);
Larry Gene Ratliff, Middletown, OH (US);
Square D Company, Palatine, IL (US);
Abstract
A pressure switch device and method of forming the device is disclosed. The switch has a hinge terminal having a fixed end of a blade apparatus pivotally attached thereto, a jaw terminal adapted to receive a free end of the blade apparatus at a receiving portion, the blade apparatus having two blades fastened together and a spacer between the blades. Pairs of cams at either end of the blades rotate to engage protrusions in order to create a pressure lock. The pressure is enhanced by a spring washer. A connecting link attached one of each pair of cams, a drive link attached to the blades and connecting link, and a drive shaft cooperate to open and close the switch such that the switch may be first placed in a closed position, and then locked by further rotation of the drive shaft as the cam protrusions engage. The drive shaft is spring loaded to create torsional force which must be overcome to rotate the drive shaft in either direction.