Boring tool

Details Boring tool Boring tool

1996-04-01

1998-06-09

Smith, Scott A.

Tool driving or impacting

With vehicle support for drive

173 28, 173147, 173148, E21B 702

Patent

active

057621489

ABSTRACT:
A boring tool with two driving heads which are used to sink a casing string and a borer string includes a controllable coupling mechanism fitted between the two driving heads. A mechanism is also provided for the lower driving head, such that the driving head is subjected to an additional downwards acting force. When both driving heads are coupled, the upper driving head is also subjected to an additional, downwards acting vertical force. In order to free the top end of the casing string, the coupling mechanism can be released so that the upper driving head can be fully raised, whilst the lower driving head remains in position adjacent to the ground.

REFERENCES:
patent: 3851714 (1974-12-01), Visser et al.
patent: 4473325 (1984-09-01), Beney et al.
patent: 4832536 (1989-05-01), Spross et al.

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