Boring or penetrating the earth – Tool removable or insertable through or around driving or... – Laterally shiftable cutter element movable through shaft
Patent
1990-04-03
1991-08-20
Dang, Hoang C.
Boring or penetrating the earth
Tool removable or insertable through or around driving or...
Laterally shiftable cutter element movable through shaft
175171, 175324, 175385, 175393, 175398, 175415, E21B 720, E21B 1032, E21B 1060, E21B 2110
Patent
active
050406213
ABSTRACT:
A flushing device for drilling tools comprises a guide member (10) carrying a drill bit (20) and being rotatably centered by the mouth of a casing tube (11) which is adapted to follow the drilling tool downhole during drilling. The drill bit (20) has a bit portion (22) that projects laterally beyond and is spaced axially in front of the casing tube (11) so as to drill a hole larger than the casing tube (11). There are external flushing grooves (70,71) on the guide member (10) adapted to lead the outflow of flushing medium and debris from the hole during drilling into the casing tube (11). At least one of these grooves (70) extends from front to rear of the guide member (10). One or more further grooves (71) are open towards said rear while ending blindly into the periphery of the guide member (10) spaced from its front. By retraction of the guide member (10) its front enters the casing tube (11). That closes the blind grooves (71) and an intensified flushing is thus possible via the remaining open grooves (70) that extends from front to rear of the guide member (10). The cutting front (40) of the bit portion (22) is flushed rotatively in counter flow to the rotational drilling direction (8) towards the full length groove (70).
REFERENCES:
patent: 1613863 (1927-01-01), Zublin
patent: 2485826 (1949-10-01), Harinck
patent: 3370658 (1968-02-01), Jansson
patent: 3848683 (1974-11-01), Persson
patent: 3870114 (1975-03-01), Pulk
patent: 4196783 (1980-04-01), Lof
patent: 4408669 (1983-10-01), Wiredal
patent: 4620600 (1986-11-01), Persson
patent: 4765416 (1988-08-01), Bjerking et al.
patent: 4817741 (1989-04-01), Lof
Dang Hoang C.
Munson Eric Y.
Stone Mark P.
Uniroc Aktiebolag
LandOfFree
Flushing means for drilling tools does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flushing means for drilling tools, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flushing means for drilling tools will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1002134