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:
Apr. 12, 1988
Filed:
Oct. 06, 1986
Gunter Piesche, Ubstadt-Weiher, DE;
Alois Krammer, Dudenhofen, DE;
Ranco Incorporated, Dublin, OH (US);
Abstract
A pressure switch device for use in an air-conditioning system, specifically a three stage device capable of switching, for example, a combined low/high pressure switch, and an on/off switch for activating compressor and condenser elements of the system, respectively. The device includes an operating chamber, a yieldable plastic membrane having roll membrane faces for transmitting system pressure level changes to pistons, a leaf spring disc and levers activating pairs of switching contacts. Upon application of three different operating pressures, each of the pistons transmitting a different pressure level, the levers and lever joints having tension springs, operate to bias the switching contacts to open and closed positions, thereby activating or deactivating the system elements.