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:
Feb. 27, 1979
Filed:
Sep. 12, 1977
Peter Wolf, Baroda, MI (US);
Auto Specialites Manufacturing Company, St. Joseph, MI (US);
Abstract
A power brake valve and a related braking system are disclosed. The valve comprises a housing defining a first bore of large diameter and a second bore of smaller diameter, and annular pistons are slidably disposed within each bore. A biended rod, also slidable within the bores, carries reaction pistons which are radially extended to cover the annular flow space of the adjacent, associated annular pistons. When the rod is pulled in a power mode of operation, each annular piston moves toward the associated annular piston to restrict and halt the normal flow of fluid through the annular piston and create a movable end wall. As pressure rises within the chambers, pressurized fluid is discharged from the valve to brake units to cause braking action. In a manual mode of operation, pulling action on the rod causes a relatively large quantity of relatively low pressure fluid to be discharged from the first chamber so as to quickly and effectively take up systemic clearances within the brake system. Further pulling action on the rod causes a relatively small quantity of relatively high pressure fluid to be ejected from the second chamber to cause effective braking action without overextended brake pedal movement.