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. 01, 1991
Filed:
May. 29, 1990
John R Plate, Milwaukee, WI (US);
Trak International, Inc., Port Washington, WI (US);
Abstract
A brake system for a vehicle includes a pump coupled to a service brake through a brake pedal valve and to a parking brake by a four-way solenoid valve which also couples the pump to a transmission disconnect valve. Activation of the solenoid valve couples the parking brake to the pump for placing the parking brake in an off mode and actuates the transmission disconnect valve to couple a transmission pump to a transmission valve. Deactivation of the solenoid valve disconnects the parking brake and operates the transmission disconnect valve to disconnect the transmission so that the vehicle cannot be driven when the parking brake is on. A check valve connects the parking brake to the brake pedal valve so that the service brake can be operated when the pump is deactivated.