Down the hole drill

Details Down the hole drill Down the hole drill

1996-11-12

1999-06-29

Harrison, Jessica J.

Tool driving or impacting

Impacting devices

Selective axial direction of impact

B25D 900

Patent

active

059154837

ABSTRACT:
A down the hole drill in which a larger surface area is provided to which a greater quantity of pressure can be applied. The drill includes a piston and cylinder assembly in which the cylinder is divided in to a plurality of longitudinally extending contiguous sections, and the piston is shaped to provide together with the cylinder a drive and lifting chamber in each sections, and the air supply and exhaust provided in separate passages in a control rod which extends along a bore in the pistons, and a piston head is provided in each section.

REFERENCES:
patent: 4030554 (1977-06-01), Kammerer, Jr. et al.
patent: 4133393 (1979-01-01), Richards
patent: 4530408 (1985-07-01), Toutant
patent: 4790390 (1988-12-01), Sweeny
patent: 4819739 (1989-04-01), Fuller
patent: 4936393 (1990-06-01), Lister
patent: 5113950 (1992-05-01), Krasnoff
patent: 5277260 (1994-01-01), Ranck
patent: 5647445 (1997-07-01), Puchala
patent: 5685380 (1997-11-01), Purcell et al.

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