Drilling grab for pile foundations and well boreholes

Details Drilling grab for pile foundations and well boreholes Drilling grab for pile foundations and well boreholes

1975-01-29

1976-06-29

Leppink, James A.

Boring or penetrating the earth

With means movable relative to tool below ground to stop...

Flow-stopping means includes relatively movable cutter element

37187, 175242, E21B 1104

Patent

active

039659992

ABSTRACT:
A drilling grab for pile foundations and well boreholes wherein the drilling grab comprises a grab body supporting circular grab spades which tilt from an open position to a closed position about pivot pins carried by the grab body. A radially projecting abutment interchangeably connected to the outer periphery of the grab body is engageable with the back of the grab spades when the same are in an open position. The abutment overlaps the periphery of the grab body and is characterized in that they consist of extension members adapted to grab spades of different sizes. The members are supported on radially projecting ribs located on the grab body.

REFERENCES:
patent: 1985710 (1934-12-01), Allard
patent: 3113629 (1963-12-01), Allard

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