Two trigger safety circuit for water cleaning lance

A two-handle cleaning lance includes a pair of switches which must be held closed by an operator to allow high pressure water to be directed to a discharge nozzle. A dump valve is selectively actuated to dump the high pressure water to a dump nozzle at which it will enter the environment at a much r...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	HERHOLD MATTHEW O
Format:	Patent
Sprache:	eng
Schlagworte:	APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL ATOMISING APPARATUS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS NOZZLES PERFORMING OPERATIONS SPRAYING APPARATUS SPRAYING OR ATOMISING IN GENERAL TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TRANSPORTING
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Beschreibung
Zusammenfassung:	A two-handle cleaning lance includes a pair of switches which must be held closed by an operator to allow high pressure water to be directed to a discharge nozzle. A dump valve is selectively actuated to dump the high pressure water to a dump nozzle at which it will enter the environment at a much reduced pressure. The dump valve is operated by a control which monitors that the two switches are both held closed. If either switch is released, then the dump valve is moved to a dump position. The present invention ensures that an operator does not disable one of the two switches such as by taping it closed. The dump valve will not move back to its actuated position until both switches have been released and have moved to an open position.