HYDRAULIC CONTROL APPARATUS FOR ENDGATES OF TRUCKS OR THE LIKE

A control system for first and second double-acting hydraulic cylinders which respectively cause the endgate of a truck to pivot between open and closed positions and to move up or down. The flow of fluid into and from the lower chambers of the cylinders is controlled by discrete three-position twow...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	HOFER F,DT, GEISLER H,DT, HERRMANN W,DT
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING HYDRAULICS OR PNEUMATICS IN GENERAL LIGHTING MECHANICAL ENGINEERING SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS WEAPONS
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Beschreibung
Zusammenfassung:	A control system for first and second double-acting hydraulic cylinders which respectively cause the endgate of a truck to pivot between open and closed positions and to move up or down. The flow of fluid into and from the lower chambers of the cylinders is controlled by discrete three-position twoway control valves, and the flow of fluid from the upper chamber of the first cylinder to a tank is controlled by an auxiliary valve assembly which acts as a pressure relief valve. If the endgate cannot displace the piston of the first cylinder due to its own weight, the auxiliary valve assembly is actuated to start a pump which delivers pressurized fluid to the upper chamber of the first cylinder. The upper chamber of the second cylinder can be connected directly to the tank or is connected with a line which conveys fluid from the upper chamber of the first cylinder to the auxiliary valve assembly.