Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1978-12-26
1981-01-13
Leppink, James A.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175 53, E21B 924
Patent
active
042444330
ABSTRACT:
A raise bit is disclosed for enlarging a pilot hole into a larger diameter hole by disintegrating the earth formations surrounding the pilot hole. The raise bit includes a removable drive stem for enabling the raise bit to be transported through small drifts. The drive stem is attached to a thrust bearing plate which, in turn, is interconnected to a main bit body. The bit body extends around the drive stem and includes a plurality of rolling cutters for contacting and disintegrating the earth formations surrounding the pilot hole. The interconnection between the thrust bearing plate and the bit body is accomplished by means of a flexible shock absorbing member which is bonded to the plate and bit body. This flexible interconnection functions to absorb the bending and impact type loads acting on the bit body. A safety mechanism is provided to limit the amount of relative axial movement of the flexibly interconnected members should the bonded interconnections separate. The safety mechanism includes a lug connected to and extending downwardly from the main bit body. The lug extends around the thrust bearing plate with a small clearance therebetween in order to retain the interconnected members should the flexible bonded connection break. The safety mechanism further includes a stop located on the thrust bearing plate adjacent the lug. Should the bonded interconnections break, the stop is adapted to engage the lug as the thrust plate rotates to impart a torque force through the lug in order to drivingly rotate the bit body.
REFERENCES:
patent: 2301296 (1942-11-01), Laurent
patent: 2457507 (1948-12-01), Strachovsky
patent: 4076087 (1978-02-01), Chuply et al.
patent: 4142593 (1979-03-01), Dixon et al.
Favreau Richard F.
Leppink James A.
Smith International Inc.
Vargo Robert M.
LandOfFree
Safety mechanism for a raise drill does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Safety mechanism for a raise drill, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Safety mechanism for a raise drill will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2227427