Thrust controlled drilling apparatus

Details Thrust controlled drilling apparatus Thrust controlled drilling apparatus

1978-05-11

1980-04-15

Briggs, William R.

Cutting by use of rotating axially moving tool

With control means energized in response to activator...

To control tool rotation

408 10, 408 12, B23B 3900

Patent

active

041981804

ABSTRACT:
Drilling apparatus for driving a drill bit in one pass through several plies of material having different hardness characteristics, and in which the speed of rotation of the drill bit is selected automatically by the thrust resistance encountered by the drill bit. The automatic selection of drill bit speed is accomplished by a feed back system responsive to drill bit thrust for changing the governor control on the drive motor, whereby the increase in thrust effects drill bit speed reduction and a decrease in thrust effects an increase in drill bit speed.

REFERENCES:
patent: 2547079 (1951-03-01), Gerentes
patent: 3051023 (1962-08-01), Hirsch
patent: 3224338 (1965-12-01), Reynolds
patent: 3248629 (1966-04-01), Reynolds
patent: 3259023 (1966-07-01), Rieger et al.
patent: 3325710 (1967-06-01), Reynolds
patent: 3418549 (1968-12-01), Emerson
patent: 3526158 (1970-09-01), Adams et al.
patent: 3720135 (1973-03-01), Merner et al.

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