Kenneth W Renfro

US Patent:

39662543, Jun 29, 1976

Filed:

Feb 4, 1975

Appl. No.:

5/546947

Inventors:

Richard E. Guhl - Decatur IL
Kenneth W. Renfro - Macon IL

Assignee:

Caterpillar Tractor Co. - Peoria IL

International Classification:

F16H 5710

US Classification:

298 22C

Abstract:

A control structure for neutralizing the transmission of a dump truck when the console switch is in a "reverse" position to prevent the truck operator from inadvertently backing the truck in the event the transmission control is in the "reverse" position at the time the operator accelerates the truck engine to operate the hoist cylinder of the dump body. A conventional dump truck hydraulic transmission system is utilized with the control for the hoisting mechanism being electrically related thereto.

US Patent:

39409317, Mar 2, 1976

Filed:

Jan 17, 1975

Appl. No.:

5/541752

Inventors:

Kenneth W. Renfro - Macon IL
Richard E. Guhl - Decatur IL

Assignee:

Caterpillar Tractor Co. - Peoria IL

International Classification:

F15B 2000
F15B 1116

US Classification:

60403

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.