Raise drill inner yoke bridge

Details Raise drill inner yoke bridge Raise drill inner yoke bridge

1977-10-25

1979-03-06

Purser, Ernest R.

Boring or penetrating the earth

Enlargement of existing pilot throughbore requiring...

175320, 175344, E21C 2300

Patent

active

041425936

ABSTRACT:
A raise drill is disclosed for enlarging a pilot hole into a large diameter hole by disintegrating the earth formations surrounding the pilot hole. The raise drill includes a bit body having a plurality of roller cutters mounted thereon. The bit body is detachable secured to a drive stem to permit removal and replacement of the stem. A shock absorbing element is interconnected between the drive stem and the bit body to enable the bit body to be flexibly mounted on the drive stem. A central yoke is provided to extend around the drive stem and interconnect the saddles of the two innermost cutters. The central yoke functions to distribute the loading of the inboard cutters. The central yoke can also function as a housing for a packing element.

REFERENCES:
patent: 3221619 (1965-12-01), Erickson
patent: 3451722 (1969-06-01), Scaravilli et al.
patent: 3750767 (1973-08-01), Pessier
patent: 3920089 (1975-11-01), Mitchell
patent: 3921734 (1975-11-01), Goodfellow
patent: 3971447 (1976-07-01), Ahlberg et al.

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