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:
Jun. 27, 1978
Filed:
Oct. 14, 1976
Toyota Jidosha Kogyo Kabushiki Kaisha, Aichi, JA;
Abstract
A fault alarm device for a vehicle dual brake system including front and rear master cylinders, front and rear wheel cylinders and a proportioning valve which functions to develop proportioned rear wheel braking fluid pressure at a reduced rate relative to the rear wheel braking fluid pressure from the rear master cylinder. The fault alarm device comprises a fault alarm circuit for indicating the fault in the dual brake system when energized, and a control valve interposed between the master cylinders and the wheel cylinders and associated with the proportioning valve. The control valve includes a body, a stepped cylinder formed in the body, a stepped piston slidably inserted in the stepped cylinder, and a sleeve slidably interposed between the stepped cylinder and piston. The alarm device further comprises a switch engaged with the stepped piston for energizing the alarm circuit in response to the sliding movement of the stepped piston from its neutral position. Thus, the stepped piston can be urged to slide from the neutral position under the force of the front wheel braking fluid pressure to insure indication of the fault in the dual brake system, even if the proportioned rear wheel braking fluid pressure between the proportioning valve and the rear wheel cylinders does not arise as a result of increase in the rear wheel braking fluid pressure from the rear master cylinder due to fault in the proportioning valve.