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:
Jul. 14, 1987
Filed:
Apr. 11, 1986
Lawrence R Myers, South Bend, IN (US);
Lloyd G Bach, South Bend, IN (US);
Robert F Gaiser, Stevensville, MI (US);
Allied Corporation, Morristown, NJ (US);
Abstract
A proportioning valve assembly (10) in a housing (12) is pressure responsive to control the flow of fluid to a wheel brake cylinder. The proportioning valve (20) is connected to a channel (31) opening into a reservoir or fluid-containing chamber (13), a second valve (34) being disposed in the channel (31) and engaging at one end an inertia sensitive ball (40) located on a variable slope surface (17), and engaging a third valve (35) at the other end. The proportioning valve (20) includes a second piston (80) having a reduced diameter end (82) engaging a third piston (105) of enlarged diameter disposed in a portion of the channel (31), the channel (31) communicating by an opening (90) with the fluid-containing chamber (13). During initial brake application by the operator, the third valve (35) remains closed so that the third piston (105) does not move and prevents further movement of the second piston (80), thereby preventing higher braking pressure from being communicated to the wheel brake cylinder. Upon obtaining an initial level of deceleration, the inertia sensitive ball (40) moves along an initial low slope portion (39) of the surface (17) so that the third valve (35) opens and permits movement of the third piston (105) by the second piston (80) so that higher braking pressures are communicated to the wheel brake cylinder. The proportioning valve assembly (10) eliminates the communication of excessive pressure to a brake assembly during vehicle travel on a low coefficient of friction roadway surface.