Device for launching percussion ground borers

Details Device for launching percussion ground borers Device for launching percussion ground borers

1978-02-08

1978-08-08

Staab, Lawrence J.

Tool driving or impacting

With means to adjust position of axis of tool advance

Plural adjustments

175103, E21C 500

Patent

active

041050797

ABSTRACT:
A launching device for launching a percussion borer at the start of a ground boring operation comprises a carrier for holding the borer with mounting means which permits the borer to move forwards relative to the carrier in a boring movement but resists backward movement, and a base plate which, in operation, is anchored to the ground and on which the carrier is adjustably mounted. The adjustment of the carrier on the base plate enables the borer to be accurately directed in the correct direction in which the boring is to be made and when the borer is set in operation, rearward impulses on the borer are transmitted through the carrier and the base plate to the ground by which they are counteracted.

REFERENCES:
patent: 1028523 (1912-06-01), Anderson
patent: 1283702 (1918-11-01), Dunn
patent: 3151687 (1964-10-01), Sato et al.
patent: 3354969 (1967-11-01), Ebeling
patent: 3814192 (1974-06-01), Steen
patent: 3853182 (1974-12-01), Bourne et al.
patent: 4024721 (1977-05-01), Takada et al.

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