Mining tool including a chisel and a chisel holder

Details Mining tool including a chisel and a chisel holder Mining tool including a chisel and a chisel holder

1989-11-30

1991-03-12

Britts, Ramon S.

Mining or in situ disintegration of hard material

Miscellaneous

299 93, 411 55, E21C 2548, E21C 2744

Patent

active

049987780

ABSTRACT:
A mining tool for the breaking-down of minerals, particularly coal. The mining tool includes a chisel with a chisel shaft with a receiving bore and a chisel holder with an insertion bore. The bores are in alignment when a locking bolt is driven into the bores. The locking bolt is a mandrel screw with a threaded portion which over its length includes a sharp thread and a trapezoidal thread. The circumferential surfaces of the trapezoidal thread form a driving-in cone. The mandrel screw can be easily driven into the receiving bore which includes a chuck. In addition, because of the sharp thread, the mandrel screw can be unscrewed quickly, so that a quick chisel exchange is possible.

REFERENCES:
patent: 3904247 (1975-09-01), Ostrop
patent: 4564324 (1986-01-01), Leibhard
patent: 4872274 (1989-10-01), Giersch et al.

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