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:
Oct. 08, 1996
Filed:
Oct. 17, 1994
Stephen R Orth, Park Ridge, IL (US);
Burton L Siegal, Skokie, IL (US);
Johnson Pumps of America, Inc., Schiller Park, IL (US);
Abstract
An automatic control for a liquid pump which assures that the pump starts when the liquid reaches a predetermined level and that the pump is stopped when the level has fallen to a second predetermined level. The control includes a permanent magnet mounted in a float which is contained within a float chamber and which has a bottom opening through which liquid can enter the float chamber. A top portion of the float chamber is provided with a one-way valve which allows air to escape from the float chamber but which prevents air from entering the float chamber so that when the float moves up with the liquid, the magnet actuates a magnetic responsive switch such as a reed switch to cause the motor to drive the pump. As the pump lowers the level of the liquid, the level of the liquid in the float chamber does not fall because of the partial vacuum within the top of the float chamber and the magnetic holds the switch closed so as to maintain energization of the pump. When the liquid falls to the bottom of the float chamber, air passes into the top of the chamber and allows the retained liquid to flow, and the float moves downwardly moving the magnet away from the magnetic responsive switch so that it opens and the pump motor stops. The float chamber and the magnetic responsive switch are remotely located from the pump.