Drilling apparatus and method for introducing a drilling...

Details Drilling apparatus and method for introducing a drilling... Drilling apparatus and method for introducing a drilling...

2007-09-04

2007-09-04

Tsay, Frank (Department: 3672)

Boring or penetrating the earth

With self-acting cyclic advance and retraction of tool or...

C175S162000

Reexamination Certificate

active

11002898

ABSTRACT:
The invention relates to a drilling apparatus and a method for introducing a drilling element into the soil comprising a drive, which is supported on a mast for introducing the drilling element, and a collet turning device having a collet which can be turned by means of at least one operating cylinder. In order to improve the torque transmission at least two collet turning devices are provided which can be engaged with the drilling element so as to transmit the torque.

REFERENCES:
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patent: 4765401 (1988-08-01), Boyadjieff
patent: 5215153 (1993-06-01), Younes
patent: 497215 (1930-04-01), None
patent: 12 15 624 (1965-05-01), None
patent: 38 09 626 (1988-03-01), None
patent: 1 558 455 (1980-01-01), None

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