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:
Mar. 07, 1989
Filed:
Jul. 20, 1987
Katsuaki Kamemoto, Yokosuka, JP;
Ken Nakaharai, Yokosuka, JP;
Nippon Air Brake Co., Ltd., , JP;
Abstract
A master cylinder includes a hydraulic pressure control valve having a valve member mounted in a valve body and normally held apart from a valve seat by a valve spring. The valve member is seated on the valve seat when a pressure in a pressure chamber of a housing of the master cylinder reaches a predetermined level. A control device includes a body received in the bore and having one end portion of a convex shape. The body of the control device is urged by a spring in such a manner that the one end portion projects through a port of the housing into the pressure chamber. The control device including a seat prevention mechanism operatively associating the body of the control device with the valve member so as to prevent the valve member from seating on the valve seat when upon movement of the cylinder piston beyond a predetermined stroke, the cylinder piston engages the one end portion and urges the body of the control device toward the valve member in a direction perpendicular to the axis of movement of the cylinder piston.