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:
May. 04, 1993
Filed:
Jul. 28, 1992
Robert K Wilson, Granger, IN (US);
Donald A Crumb, Granger, IN (US);
Allied-Signal Inc., Morristown, NJ (US);
Abstract
A center-compensation master cylinder (10) has first (20) and second (30) pistons with center-compensation valve members (27, 37). The pistons (20, 30) have diametrically extending slots (22, 32) at central axial portions thereof through which extend pin members (53, 54) to effect opening of the valve members (27, 37) when the pistons (20, 30) are in at-rest positions. A first spring (29) extends between a head (24) of the first piston (20) and the second piston (30), and a second spring (39) extends between an end (15) of the bore 0 (I4) and the head (34) of the second piston (30). The first spring (29) is caged via a caging mechanism (60) ensuring that the first (20) and second (30) pistons will travel simultaneously when the center-compensation valve members (27,37) are closing. The caging mechanism (60) is adjustable to control accurately the location of the second piston (30 ) in an at-rest position. The caging mechanism comprises an end part (47) non-rotatably and axially coupled with longitudinal extensions (40) of the head (24) of the first piston (20), a member (65) adjustably coupled with a threaded end (47C) of the end part (47), and a head (66) of the member (65) abutting a cage end member (70) which seats at a back portion (31) of the second piston (30). The cage end member (70) is cup-shaped and includes a radially flared lip (74) providing a seat for one end of the first spring (29) while the other end of the first spring (29) is received at a diametral extension (28) of the first piston (20).