Drill bit for undercutting a blind bore

Details Drill bit for undercutting a blind bore Drill bit for undercutting a blind bore

1987-04-14

1988-09-06

Massie, IV, Jerome

Boring or penetrating the earth

Tool shaft advanced relative to guide insertable in...

175 80, 175263, 175399, E21B 708, E21B 728

Patent

active

047685999

ABSTRACT:
A bit assembly for undercutting a blind bore extending along a bore axis between an open outer end and a closed inner end and having a substantially cylindrical wall of a predetermned diameter centered on the bore axis and extending between the ends comprises a pusher body normally seated in the closed inner end of the bore and having an outwardly turned camming surface inclined to the bore axis, and a bit having a shaft extending along a longitudinal bit axis and having an inner end, an outer end, and a pair of longitudinally extending sides terminating at the inner end. One of the sides is at least partially cylindrical and centered on the bit axis and the inner end is formed with a camming surface engageable with the camming surface of the body and inclined to the bit axis. A blade fixed permanently and stationarily on the inner end projects radially from the one side of the shaft, the other side being cut back toward the bit axis.

REFERENCES:
patent: 141344 (1873-07-01), Gillespie
patent: 1138332 (1915-05-01), Underwood
patent: 1207119 (1916-12-01), Young
patent: 2638327 (1953-05-01), Baldwin
patent: 4635737 (1987-01-01), Miyanaga
patent: 4640371 (1987-02-01), Moraly

Affiliated with

Also associated with

Rating

Drill bit for undercutting a blind bore does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Drill bit for undercutting a blind bore, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drill bit for undercutting a blind bore will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1601611