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Hydroblasting spray gun having an on/off safety switch system
| Details |
Inventors: Boisture, Thomas B.;
Assignee: C. H. Heist Corp (Baytown, TX)
Primary Examiner: Weldon; Kevin
Assistant Examiner:
Attorney, Agent or Firm: Pravel, Hewitt, Kimball & Krieger
An improved hydroblasting gun having an on/off safety switch system. The on/off switch system comprises at least two actuatable triggers each displacing a specified volume of incompressible fluid which, when coupled with a predetermined volume within an actuator, displaces a piston initiating a signal. In specific application, two separate triggers are depressed displacing a predetermined volume in an actuator adjacent a shut-off valve. Until the actuator fully opens the shut-off valve, hydroblasting operations may not begin. In this manner, the chances of accidental discharge through the depression of a single trigger are eliminated and preferred ergonomical characteristics are provided. |
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DETAILED DESCRIPTION The present invention is an improved hydroblasting spray gun having a base frame, a first actuatable trigger, a second actuatable trigger, an actuator housing in cooperation with the first and second actuatable trigger, and a shutoff valve to provide spontaneous on/off control for discharging of water or other liquids.
The first actuator includes a frame attached to the base frame, a lever supported within the actuator frame, a housing supported within the actuator frame, and a displaceable ram supported within the housing and in contact with the lever.
Upon rotation or pivotal movement of the lever, the ram displaces a predetermined first volume of fluid within the housing.
The second actuatable trigger also includes a frame, a lever, a separate housing and a displaceable ram supported within that housing.
The lever is in spaced relationship to the ram of the second trigger so that upon rotation or pivotal movement of the second lever, the ram within the housing of the second actuator trigger displaces a predetermined second volume of incompressible fluid within the housing of the second trigger.
The actuator includes a housing and a displacable piston supported within the actuator housing.
The actuator housing is in fluid communication with the volumes of incompressible fluid displaced by the rams of the first and second triggers.
A piston is supported within the actuator housing and is thereby displaced a predetermined third volume which is at least greater than either the first volume or the second volume so that upon displacement of the piston within the actuator housing by said predetermined third volume, a signal is generated.
The shut-off valve includes a housing having a sealing piston biased to a closed position and adapted to be contacted by the piston supported within the actuator housing.
In this manner, upon displacement of the piston within the actuator housing by the predetermined third volume, the actuator piston contacts the biased piston within the shut-off valve housing and displaces the biased piston enabling actuation of the gun
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