Boring or penetrating the earth – Processes
Patent
1979-04-20
1981-06-02
Leppink, James A.
Boring or penetrating the earth
Processes
175173, 175202, 175272, 175325, E21B 1026, E21B 1710
Patent
active
042706181
ABSTRACT:
Large hole boring equipment is used for boring a large diameter blind pilot hole. Then such equipment is removed from the hole and a room is blasted at the closed or blind end of the hole. Then the large hole cutterhead is replaced by a reamer and the equipment is inserted back into the hole. The reamer is an adjustable diameter type and its diameter is increased once it is within such room. A wrench carried by a drive head of a drilling machine is used to rotate a small diameter shaft which extends downwardly through the drill string to a lead screw which is a part of the reamer. Rotation of the lead screw causes axial travel of a lead nut. As the lead nut travels it moves a plurality of links which in turn swing a plurality of cutter carrying arms outwardly from the axis of rotation. Once the desired fly diameter of the reamer is achieved, the wrench is removed from the drive head, then the small diameter shaft is locked against additional rotation, and the drive head is drivingly attached to the upper end of the drill string so that it can be used for rotating the drill string and the reamer attached thereto.
REFERENCES:
patent: 1498463 (1924-06-01), McCloskey et al.
patent: 2203246 (1940-06-01), Zum-Berge
patent: 2886288 (1959-05-01), Gehrke
patent: 3231029 (1966-01-01), Winberg
patent: 3280416 (1966-10-01), Forsyth
patent: 3302983 (1967-02-01), Garrett
patent: 3599734 (1971-08-01), Farris
patent: 4102413 (1978-07-01), Johnston
Favreau Richard E.
Leppink James A.
The Robbins Company
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