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. 24, 2001
Filed:
Jan. 31, 2000
Ulf Emmerich, Weibenburg, DE;
Thaddäus Buratowski, Langenaltheim, DE;
Alfmeier Prazision AG Baugruppen und Systemlosungen, Treuchtlingen, DE;
Abstract
A checkvalve (,) is provided with an inlet which can be connected to an operating system requiring a negative pressure, e.g. to a braking force amplifier (,), an outlet (,) which can be connected to a negative-pressure system producing a negative pressure, a main air channel (,) connecting the inlet and the outlet in a fluid manner and enabling an air flow in the direction of the outlet, a first checkvalve (,) installed in the main air channel (,), a single outside-air channel (,) which branches off downstream of the first checkvalve (,) and lets out into the atmosphere and a cross-sectional narrowing (,) in the manner of a venturi pipe (,), a venturi channel (,) connecting the cross-sectional narrowing (,) upstream of the first checkvalve (,) to the main air channel (,) and a second valve (,) located between the inlet (,) and the cross-sectional narrowing (,) in the main air channel (,) or in the venturi channel (,). A shut-off valve is located before or after the cross-sectional narrowing (,) in the outside-air channel (,) and is actuated as a function of the system pressure (p,) prevailing in the operating system in such a manner that the connection to the atmosphere is established when a predetermined target pressure (P,) is exceeded and is interrupted when the pressure drops below this pressure.