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:
Mar. 02, 1976
Filed:
Jan. 17, 1975
Kenneth W Renfro, Macon, IL (US);
Richard E Guhl, Decatur, IL (US);
Caterpillar Tractor Co., Peoria, IL (US);
Abstract
An emergency hydraulic system for use in a vehicle having an engine which not only powers the vehicle but also drives a main hydraulic pump to supply hydraulic fluid under pressure to a hydraulic control means is disclosed. The emergency hydraulic system includes an auxiliary hydraulic pump driven by an electric motor to provide an auxiliary source of hydraulic fluid under pressure to the hydraulic control means under emergency conditions. An electrical control circuit for the electric motor is described which control circuit will automatically activate the electric motor whenever the engine is operating normally but the flow of hydraulic fluid from the main hydraulic pump falls below a given level and will automatically inactivate the electric motor whenever the engine is operating normally and the flow of hydraulic fluid from the main hydraulic pump is above a given level. As disclosed, the control circuit also includes means for the manual operation thereof and means for automatically activating the electric motor only if the engine of the vehicle should fail after it has been in normal operation.