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:
Jan. 26, 1988
Filed:
Mar. 01, 1985
David C Hurst, West Midlands, GB;
Alfred Yardley, West Midlands, GB;
Robert A Anderson, West Midlands, GB;
Abstract
In an hydraulic anti-skid braking system of the pump and de-boost type the position of the de-boost piston in the bore is determined by a volume of fluid trapped in a space by a dump valve. The dump valve operates in conjunction with a restrictor which, at least at pressures above a pre-set level, restricts the rate of release of fluid from the space when the dump valve is open. Decreasing the flow rate of the dump valve decreases the time period for each anti-skid cycle. The pump no longer has to pressurize to maximum (brake) from zero which reduces the amount of energy which otherwise would have been consumed in the re-application mode. In addition the rate of release of fluid at pressures below the pre-set level can be increased which is of particular advantage when the vehicle is travelling over surfaces having low co-efficients of friction.