Boring tool for radial enlargement of a cylindrical foundation b

Details Boring tool for radial enlargement of a cylindrical foundation b Boring tool for radial enlargement of a cylindrical foundation b

1982-06-23

1984-05-08

Purser, Ernest R.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by longitudinally relatively movable...

175287, 408158, E21B 1032

Patent

active

044469349

ABSTRACT:
A boring tool for radial widening or enlargement of a cylindrical bottom, foundation, or anchor bore. The boring tool comprises a tubular tool body having a tool shank provided for clamping in a driving machine or prime mover, and an enlarging spindle guided in the tool body and adapted to be supported on the bottom of the bore. When entering into the tool body, the enlarging spindle radially adjusts the cutting parts or elements provided for carrying out the enlargement. The tool body is formed of radially resilient segments which extend in the axial direction and delimit longitudinal slots which are open toward the front end of the tool. Cutting parts or elements are arranged on the free ends of the segments, with each part having an axial working which extends in the circumferential direction of the tool body, with those working surfaces which are adjacent one another in the circumferential direction forming the front end face of the tool body. In the starting state of the tool body, the cutting parts form a substantially complete circular ring.

REFERENCES:
patent: 833240 (1906-10-01), Potter
patent: 1244992 (1917-10-01), Lee
patent: 2511650 (1950-06-01), Robinson
patent: 4091882 (1978-05-01), Hashimoto

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