High velocity pneumatic device
AssigneeM-B-W Inc.
InventorThomas G. Artzberger
Life of this patent
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Abstract
A high velocity pneumatic device having particular use for excavating or dislodging soil. The device includes a body or housing having a passage that connects a source of air under pressure, such as a compressor, to an elongated discharge tube. A valve mechanism is disposed in the passage and controls the flow of air through the tube. Mounted in the distal end of the tube is a nozzle having an inwardly converging upstream and an outwardly diverging downstream end which increases the velocity of the air being discharged through the tube. A manually operable trigger is directly connected to the valve mechanism and actuates the valve to discharge air through the tube. The nozzle is formed of a non-sparking metal, such as brass, while the tube is composed of an electrically nonconductive material, such as glass reinforced resin.
Claims21
A high velocity pneumatic excavating apparatus, comprising a body having passage means extending therethrough, gas supply means connected to said passage means for supplying a gas under pressure to said passage means, an elongated tube having one end connected to said passage means and having a distal end, valve means disposed in said passage means for opening and closing said passage means, a separate nozzle mounted on the distal end of said tube and constructed and arranged to increase the velocity of the gas being discharged through said nozzle, manual actuating means operably connected to said valve means for moving said valve means to an open position to enable gas to pass through said passage means to said tube, said nozzle being composed of a nonsparking metal and said tube being electrically non-conductive and composed of fiber reinforced thermosetting resin.
A high velocity pneumatic excavating apparatus, comprising a body having passage means extending therethrough, gas supply means connected to said passage means for supplying a gas under pressure to said passage means, a tube having one end connected to said passage means and having a distal end, valve means disposed in said passage means for opening and closing said passage means, a nozzle mounted in the distal end of said tube and constructed and arranged to increase the velocity of the gas being discharged through said nozzle and against a material to be excavated, manual actuating means operably connected to said valve means for moving said valve means to an open position to enable gas to pass through said passage means to said tube, a sleeve spaced outwardly of said tube to provide an annular chamber therebetween, port means in said tube providing communication between the interior of said tube and said chamber, and discharge means communicating with said chamber for discharging gas from the chamber and around the tube in the form of an annular curtain, wherein said sleeve has an operative position where said port means communicates with said chamber and an inoperative position where a portion of said sleeve closes off said port means so that said port means is out of communication with said chamber.
A high velocity pneumatic apparatus, comprising a body having passage means extending therethrough, gas supply means connected to said passage means for supplying gas under pressure to said passage means, a tube having one end connected to said passage means and having a distal end, valve means disposed in said passage means for opening and closing said passage means, a nozzle mounted in the distal end of said tube and constructed and arranged to increase the velocity of the gas being discharged through said nozzle, actuating means operably connected to said valve means for moving said valve means to an open position to enable gas to pass through said passage means to said tube, said nozzle having an upstream end and a downstream end and having an orifice extending between said ends, said orifice including an upstream inwardly converging section and a downstream outwardly diverging section terminating in an outlet, said downstream end being disposed normal to the axis of said orifice, end having a recess coaxial with said orifice, and said recess having a greater diameter than said outlet.
Dependencies are inferred from the claim text.