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:
Nov. 09, 2004
Filed:
Sep. 26, 2002
Eckehart Schulze, Weissach, DE;
Abstract
The invention relates to an electrohydraulic monitoring device for a dual effect hydraulic cylinder in which certain operating pressures must be maintained. A pressure reduction valve is provided for setting said pressures, this pressure reduction valve being used to set a defined pressure ( ) by adjusting the pretension of the valve spring ( ). The valve spring is situated in a spring chamber ( ) which is bordered by a regulating sleeve ( ) on one side, in an axially moveable manner. Said regulating sleeve is displaceable between two end positions within a limited axial stroke area. The alternative switching positions of a micro-switch ( ) are linked to these end positions. Two sensor chambers, each of which is connected to one of the pressure chambers of the cylinder in such a way that they communicate, are provided and are delimited by sensor pistons ( ) in order to determine the operating pressure that is being coupled into the hydraulic cylinder at a particular time. The alternative subjection to pressure and relief from said pressure of these sensor chambers forces the regulating sleeve into the same end position, respectively.