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. 07, 1984
Filed:
May. 26, 1981
Wilfred E Boehringer, Fullerton, CA (US);
McDonnell Douglas Corporation, Long Beach, CA (US);
Abstract
A vane for use in switching a hydraulic port formed in a cylindrical surface, the vane having a wiper at the top of the vane body with a ring shaped surface whose inner edge is shaped to match the shape of the hydraulic port and surface shaped with a contour which is a portion of a cylinder so that it can mate for sliding contact with the interior cylindrical surface about the port. A ring shaped undersurface adapted to have pressure applied thereto is provided underneath the ring shaped surface to provide the force by which the vane is held against the cylindrical surface while port pressure is provided underneath the vane on an area to balance with the port area.