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. 23, 1984
Filed:
May. 14, 1982
Ronald D Hayden, Eastlake, OH (US);
Euclid, Inc., Cleveland, OH (US);
Abstract
An improved brake control apparatus for a brake system having redundant brake application fluid circuits 30, 32 and a brake retraction fluid circuit 62. A valve assembly 34, including a slidable two position valve element 60 communicates one brake application fluid circuit 30 with the retraction circuit 62, during normal brake actuation. The valve element 60 is biased towards one position by the combination of pressure in the other brake application circuit 32 and a resilient biasing arrangement 68, and biased towards the second position by pressure in the one application circuit 30. In the event of failure in the other application 32 circuit, the loss of biasing fluid pressure causes the valve element to shift to the second position, interrupting fluid communication from the one application circuit to the retraction circuit and drains fluid pressure in the retraction circuit into the failed circuit. The valve assembly also includes a check valve 62a and flow restriction 62b which cooperate with an accumulator 86 to delay the depressurization of the retraction circuit whenever the brakes are deenergized in order to obtain piston retraction.