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:
Apr. 13, 1982
Filed:
Jul. 11, 1980
Hans-Henning Lupertz, Darmstadt, DE;
ITT Industries, Inc., New York, NY (US);
Abstract
Known pressure reducing valves for brake systems of automotive vehicles are provided with a stepped piston and a valve. Upon attainment of the switching pressure the valve is closed and the pressure is reduced at the outlet according to the ratio of surfaces of the stepped piston. These known pressure reducing valves are insecure in their operation, complicated in their structure and expensive in their manufacture. These disadvantages are overcome in accordance with the present invention by providing a valve closing unit including an elastic rubber sealing body disposed at the inlet end of a pressure medium connection in the piston between an inlet chamber and an outlet chamber. When the switching pressure is reached this sealing body closes the pressure medium connection. If the pressure in the outlet chamber is greater then the pressure in the inlet chamber, the sealing body due to its elasticity lifts off the inlet side of the pressure medium connection.