Rock drill

Details Rock drill Rock drill

2005-02-15

2005-02-15

Tsay, Frank (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

C175S322000, C173S018000, C173S058000

Reexamination Certificate

active

06854538

ABSTRACT:
A rock drill includes a shank. A percussion piston is arranged to hit the back end of the shank. Further, a pulling element is arranged around the shank, to which a pulling force can be directed in such a manner that the shank can, by the pulling force, be moved toward the percussion piston, when stuck drilling equipment is freed. During rock drilling, a push force is arranged to act on the pulling element, the push force being opposite with respect to the pulling force. The push force is designed in such a manner that during drilling the pulling element moves due to the push force toward the front section of the drill to be at a predefined distance from the position corresponding to the impact point of the shank.

REFERENCES:
patent: 4109734 (1978-08-01), Montabert
patent: 4658913 (1987-04-01), Yantsen et al.
patent: 4718500 (1988-01-01), Mori
patent: 4928775 (1990-05-01), Lee
patent: 5002136 (1991-03-01), Barthomeuf
patent: 5435401 (1995-07-01), Hedlund et al.
patent: 5680904 (1997-10-01), Patterson
patent: 5803187 (1998-09-01), Javins
patent: 6502650 (2003-01-01), Beccu
patent: 9842481 (1998-10-01), None

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