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. 18, 1986
Filed:
Jan. 21, 1986
Norbert Mucheyer, Rechtenbach, DE;
Mannesmann-Rexroth GmbH, Lohr am Main, DE;
Abstract
An apparatus for controlling the movement of a movable element as a working circuit (10) with a directional control valve (3) equipped to control devices (11, 12) which can be pressure activated in two directions. A control circuit (29) which can be connected to a fluid source (19) is used to activate the directional control valve for which the control circuit is connected to the two control devices and has an adjustable first choke (24) connected to one of the two control devices (12), a second choke (22) which is similarly adjustable and connectable to the same control device, and third and fourth adjustable chokes (27, 28) which are connectable to the other of the two control devices (11). The first and third chokes are connectable further to a storage tank (7) and the second and fourth chokes are further connectable to a pressure source. A proportioning pressure valve (45) can be connected to the other of the two control devices (11). The first and third chokes are connected to a pilot valve (38). To form a simple device with which the chokes connected in series as reference and current value elements, respectively, with as little line as possible, the proportioning pressure valve and the first and third chokes are separately connected to ports of the pilot valve. In one control position, the pilot valve interconnects the first and second chokes and connects the proportioning pressure valve to the third choke. In the other control position, the first and second chokes are interconnected through a fifth choke and the third and fourth chokes are connected directly. The proportioning pressure valve is designed as a leak-proof valve.