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. 12, 1976
Filed:
Feb. 18, 1975
Norman J Hodge, Peoria, IL (US);
John W Bridwell, Peoria, IL (US);
Caterpillar Tractor Co., Peoria, IL (US);
Abstract
A control system for a vehicle parking brake-actuator which releases the brake when subjected to fluid under pressure and which automatically sets the brake by spring force when the fluid pressure is relieved therefrom, the actuator being controlled by a valve which blocks or allows the relief of fluid pressure from the brake-actuator. The control system includes a solenoid for moving the valve to pressure-blocking position, a spring for moving the valve to pressure-relieving position when the solenoid is de-energized, and includes an electrical circuit for de-energizing the solenoid and causing an automatic setting of the brake if the vehicle engine is stopped or if there is a loss of oil pressure or electrical power. The brake can also be set by the operator when the engine is running.