Big hole bit

Details Big hole bit Big hole bit

1977-06-06

1978-11-14

Purser, Ernest R.

Boring or penetrating the earth

Processes

Boring with specific fluid

166 65M, 175311, 175328, 299 8, 294 655, E21C 900, E21C 706

Patent

active

041251679

ABSTRACT:
A large diameter drill bit having a plurality of rolling cutters is provided with permanent magnets mounted on flexible flaps to collect magnetic debris on the bottom of a drill hole. A flap carrying a permanent magnet is mounted adjacent each cutter, or flaps carrying magnets are formed in a radially extending row to sweep the bottom of the hole as the bit rotates. In another form, magnets are included in wheels which roll on the bottom of the hole to collect the magnetic debris.

REFERENCES:
patent: 474297 (1892-05-01), Hoffman
patent: 2734767 (1956-02-01), Donham
patent: 2982367 (1961-05-01), Kucera
patent: 3011819 (1961-12-01), Moseley, Jr.
patent: 3227216 (1966-01-01), Bumpers
patent: 3384191 (1968-05-01), Schumacher, Jr. et al.
patent: 3762486 (1973-10-01), Grovenburg et al.
patent: 3776593 (1973-12-01), Kuhlmann-Schaefer et al.

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