Rotary digging and compression enlarging driller and boring...

Boring or penetrating the earth – Processes

Reexamination Certificate

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Details

C175S162000, C175S203000

Reexamination Certificate

active

07938198

ABSTRACT:
A compression enlarging driller comprises a vehicle body; a pole; an outer drilling rod; an inner drilling rod disposed within the outer drilling rod and moveable in a longitudinal direction; a windlass; a connecting lever having an upper end connected with a lower end of the inner drilling rod; a rotary digging bucket connected with a lower end of the connecting lever; a rotary enlarging device; a driving device; and a first hydraulic cylinder. When the driller bores a hoe, it can bore and enlarge the hole without changing a drill bit. A pile constructed by the driller has a high bearing capacity, the number of required piles is decreased, costs lower, and efficiency is improved.

REFERENCES:
patent: 2631013 (1953-03-01), Darin
patent: 3039547 (1962-06-01), Glover
patent: 2458344 (2001-11-01), None
patent: 2526490 (2002-12-01), None
patent: 2698954 (2005-05-01), None
patent: 2718062 (2005-08-01), None
patent: 2767507 (2006-03-01), None
patent: 8-303169 (1996-11-01), None
International Search Report from PCT/CN2007/000647 dated Jul. 19, 2007 (2 pages).
Written Opinion from PCT/CN2007/000647 dated Jul. 19, 2007 (3 pages).

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