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. 09, 1991
Filed:
Aug. 07, 1989
Charles J Yarbrough, Claremont, CA (US);
General Dynamics Corp., Air Defense Systems Div., Pomona, CA (US);
Abstract
A device for use as a float switch device for use in a liquid medium is disclosed which has a magnetic latching feature used to produce an offset, with the switch actuating in a first manner when the liquid level drops to a first level, and actuating in a second manner when the liquid level rises to a second level which is aabove the first level by a selected offset distance. The float element has two buoyant disks on the ends of a hollow cylinder, with switching magnets being located intermediate the two buoyant disks, and latch magnets being located on the bottom of the bottom buoyant disk. The float element slides vertically on a switch stem having a magnetic reed switch therein and a steel washer on the bottom thereof, with the float element being latched in a downward position by the latch magnets until the liquid level rises to the level of the upper buoyant disk, resulting in crisp and precise operation of the switching function.