Large diameter bit with bridge mounted drive stem

Details Large diameter bit with bridge mounted drive stem Large diameter bit with bridge mounted drive stem

1978-10-06

1980-01-08

Leppink, James A.

Boring or penetrating the earth

Enlargement of existing pilot throughbore requiring...

175344, E21C 2300

Patent

active

041824229

ABSTRACT:
A drill bit is shown for enlarging a pilot hole into a larger diameter hole by disintegrating the earth formations that surround the pilot hole. The bit includes a cutterhead with a multiplicity of saddles containing rolling cutters for contacting and disintegrating the formations that surround the pilot hole. The rolling cutters are mounted so that the cutter face profile of the cutters extends in a uniform manner to the edge of the pilot hole and eliminates uncut bottom. A drive stem or stinger projects from the cutterhead. The lower portion of the drive stem or stinger comprises extensions that reach over or "bridge" the inner legs of the center saddles and extend into the available vacant areas between the saddles for attachment to the body of the cutterhead.

REFERENCES:
patent: Re27597 (1973-03-01), Talbert
patent: 2755071 (1956-07-01), Kammerer, Jr.
patent: 3659659 (1972-05-01), Lichte
patent: 3675729 (1972-07-01), Neilson
patent: 3750767 (1973-08-01), Pessier
patent: 3805901 (1974-04-01), Coski
patent: 4108259 (1978-08-01), Dixon et al.

Affiliated with

Also associated with

Rating

Large diameter bit with bridge mounted drive stem does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Large diameter bit with bridge mounted drive stem, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Large diameter bit with bridge mounted drive stem will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1940057