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
1991-04-23
Britts, Ramon S.
Boring or penetrating the earth
Tool removable or insertable through or around driving or...
Laterally shiftable cutter element movable through shaft
175284, 175384, 175398, E21B 1066
Patent
active
050092740
ABSTRACT:
A drilling tool is followed by a casing tube (11) down the drilled hole. The mouth of the casing tube (11) centers rotatably a guide member (10) which receives rotation and impact energy via the interior of the casing tube (11). A drill bit (20) consists integrally of an axially protruding pilot portion (23), a sidewise projecting eccentric portion (22) and a rear shaft (21). The shaft (21) extends pivotally and axially movably into an eccentrically disposed bore (24) in the guide member (10). Axially spaced peripheral end grooves (30,32) extend in opposite direction from an axial cam groove (31) on the shaft (21) and are engaged by a follower (28) in the guide member (10) defining positively the axial and angular movability and positions thereof relative to the drill bit (20). In the forward end groove (32) the follower (28) maintains the drill bit (20) axially in drilling position (FIG. 2) adjacent to the guide member (10) with the eccentric portion (22) protruding to drill a hole larger than the casing tube (11). In an intermediate position 90.degree. away from the drilling position, the follower (28) enters the cam groove (31) whereby the guide member (10) becomes axially movable the distance between the end grooves (30,32). In a rear axial position the guide member (10) by a continued 90.degree. turn brings the follower (28) into the rear end groove (30) to axially define the retracted position (FIG. 1) of the drill bit (20), wherein it can be raised or lowered freely through the casing tube (11).
REFERENCES:
patent: 3416616 (1968-12-01), Ahlgren
patent: 4408669 (1983-10-01), Wiredal
patent: 4545443 (1985-10-01), Wiredal
patent: 4591010 (1986-05-01), Persson
patent: 4620600 (1986-11-01), Persson
patent: 4770259 (1988-09-01), Jansson
Britts Ramon S.
Melius Terry Lee
Munson Eric Y.
Stone Mark P.
Uniroc Aktiebolag
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