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. 28, 1989
Filed:
Apr. 29, 1988
Leonardo Cadeddu, Crema, IT;
Bendix Italia S.p.A., Crema, IT;
Abstract
A vacuum brake booster and hydraulic master cylinder arrangement with lost-motion-eliminating abutment between the vacuum booster push rod and the master cylinder piston. The vacuum booster has an input rod, a valve, a power piston, and an adjustable length output push rod. A first spring biases the power piston to the rest position but exerts a force less than the counter-force exerted by atmospheric pressure on the input side portion of the power piston extending from the booster housing. A second spring urges the cylinder piston into contact with the push rod. This second spring is stronger than the first spring so that when vacuum is applied in the rest position the action of the two springs exerts a net force sufficient to balance the force exerted on the power piston exterior by atmospheric pressure and also maintains the push rod in constant contact with the master cylinder piston to minimize the overall actuation lost stroke of the assembly.