Pneumatic excavator

Details Pneumatic excavator Pneumatic excavator

1997-03-14

1999-10-19

Pezzuto, Robert E.

Excavating

Ditcher

137874, 239532, 239587, 171 1, E02F 502

Patent

active

059668474

ABSTRACT:
A portable excavator having a tube to point a supersonic gas stream at a buried object. The excavator includes a movable member disposed within the conduit to pulse gas passing through the conduit and a supersonic gas nozzle at the exit of the conduit. Compressed gas delivered to the conduit exits the nozzle in a pulsed manner at two to three Hz. The movable member includes a piston which blocks gas from flowing through the conduit by the biasing force of a spring. When the force from the pressure differential across the piston exceeds the biasing force, the piston moves and allows gas to flow through the conduit until the force from the pressure differential across the piston is less than the biasing force.

REFERENCES:
patent: 2557247 (1951-06-01), Ziherl
patent: 3940072 (1976-02-01), Ishikawa et al.
patent: 4288886 (1981-09-01), Siegler
patent: 4936031 (1990-06-01), Briggs et al.
patent: 5140759 (1992-08-01), Artzberger
patent: 5170943 (1992-12-01), Artzberger
patent: 5195208 (1993-03-01), Yamami et al.
patent: 5291819 (1994-03-01), Hambric

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