Two trigger safety circuit for water cleaning lance

Fluid sprinkling – spraying – and diffusing – With system fluid relief or return to supply

Reexamination Certificate

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Details

C239S114000, C239S118000, C239S123000, C137S465000, C137S015040

Reexamination Certificate

active

06880767

ABSTRACT:
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.

REFERENCES:
patent: 2138279 (1938-11-01), Kneisley
patent: 4538142 (1985-08-01), Hamilton et al.
patent: 4678892 (1987-07-01), Finger et al.
patent: 4716401 (1987-12-01), Wohlford et al.
patent: 5069391 (1991-12-01), Seasholtz
patent: 5904297 (1999-05-01), Kendrick et al.
patent: 5938472 (1999-08-01), Yuen et al.

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