Abstract: A focusing nozzle for producing and jetting a precisely focused, sustained cohesive jet of a mixture of a fluid and abrasive material, having a long coherence length and a prolonged centerline pressure for obtaining clean, precise, sharp-edged kerfs, cuts and grooves in hard substances.

Abstract: A rotating hose device for rotating and helically thrusting a high pressure hose and biased nozzle into a pipe for the purpose of cleaning the interior surface of the pipe. The rotating hose device is powered by converting linear torque from a rotating high pressure hose into linear thrust, forcing the high pressure hose and biased nozzle into the pipe, where the high pressure hose and biased nozzle travel through the pipe in a helical manner. The present invention more effeciently cleans conduit, pipe and other tubular members, by constantly positioning the biased nozzle against the interior surface of the pipe and avoiding the "streaking" effect left by prior art nozzles. The helical pitch of the rotating high pressure hose, speed and direction of travel of the high pressure hose are controlled through the alignment of the drive wheels in the rotary hose drive.

Abstract: A retractable rotating hose device for rotating and helically thrusting a high pressure hose and biased nozzle into a pipe for the purpose of cleaning the interior surface of the pipe. The retractable rotating hose device is powered by converting linear torque from a rotating high pressure hose into linear thrust, forcing the high pressure hose and biased nozzle into the pipe, where the high pressure hose and biased nozzle travel through the pipe in a helical manner. The retractable rotating hose device remains generally stationary during the pipe cleaning operation and includes a spring-operated spool which automatically rewinds the high pressure hose at the termination of pipe cleaning operations. The present invention more effeciently cleans conduit, pipe and other tubular members, by constantly positioning the biased nozzle against the interior surface of the pipe and avoiding the "streaking" effect left by prior art nozzles.

Abstract: A pulsating nozzle which includes a rotating head driven by reaction forces of high pressure water passing through outlets disposed at an angle to a plane normal to the axis about which the head rotates and through a plurality of spaced passages extending partially circumferentially with respect to such axis.

Abstract: A rotating nozzle for a high pressure water blasting system comprising a rotating body mounted on a fixed shaft having a high pressure water passage therein and adapted to discharge a stream of high velocity water through a nozzle opening in said body that is inclined relative to the longitudinal axis of the rotating body to direct the discharge from the nozzle in a circular path when the body is rotated.

Abstract: A high pressure fluid spray gun comprising an adjustable shoulder support with a rotatable head and a length adjustment mechanism. The high pressure gun also includes a reversible piston and seat operable by a manual trigger for directing the flow of high pressure fluid to discharge either through the gun barrel or to a dump chamber which is mounted on a swivel for convenient adjustment of the alignment of the dump hose. The high pressure inlet hose is connected to a "Y" fitting in the barrel to reduce the back thrust on the operator when the gun is being operated.

Abstract: A nozzle having a shaped bore formed with a plurality of highly polished and substantially flat surfaces joined together to form a non-circular bore with a non-circular opening for producing a non-circular, high velocity adhesive jet stream.

Abstract: A liquid-abrasive cleaning method and apparatus in which abrasive particles are accelerated into a high pressure liquid stream and transmitted by the liquid onto a surface for removing paint, rust or other substances coating the surface. The invention includes a flow regulator for regulating the flow of particles as they are drawn into the nozzle by the high pressure liquid stream.