Latching bit sub

Details Latching bit sub Latching bit sub

1988-12-12

1989-08-29

Novosad, Stephen J.

Boring or penetrating the earth

With tool shaft detail

285 18, 285319, 294 8631, 294 8632, 403290, E21B 17046, E21B 1706

Patent

active

048608386

ABSTRACT:
A drill bit latch assembly for releasably securing an earth drill bit to the bottom end of a drill string comprises a tubular housing adapted to be secured to the bottom end of a tubular drill string, drill bit holder adapted to be secured to a drill bit, and a latch assembly. The drill bit holder is telescopically movably received in one end of the housing and coupled thereto for rotation with the housing. The latch assembly is telescopically received in the other end of the housing. The latch assembly releasably engages the holder and is operative with the housing for maintaining the holder in a predetermined operative position within the housing. The latch assembly is responsive to an unlatching tool lowered down the drill string to unlatch the holder.

REFERENCES:
patent: 2252767 (1941-08-01), Hudson
patent: 3604746 (1971-09-01), Notari
patent: 3746093 (1973-07-01), Mullins
patent: 3863715 (1975-02-01), Yonker
patent: 3955633 (1976-05-01), Bowles
patent: 4232888 (1980-11-01), Amancharla
patent: 4407364 (1983-10-01), Johnston
patent: 4488596 (1984-12-01), Akkerman
patent: 4708524 (1987-11-01), Goris

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