Positive feed drill

Details Positive feed drill Positive feed drill

1982-03-18

1984-04-17

Briggs, William R.

Cutting by use of rotating axially moving tool

With stopping upon completion of prescribed operation

408130, B23B 3910, B23B 4722

Patent

active

044431392

ABSTRACT:
A positive feed drill has an elongated spindle mounted for reversible longitudinal motion in a drill housing. The spindle has a hexagonal cross-section with the apices of the hexagon being threaded. A toothed drive gear having a hexagonal aperture centrally thereof has a close sliding fit with the spindle for imparting rotation thereto. A feed gear threadedly engages the spindle apices and is selectively rotated at a different rotational speed than the drive gear to correspondingly longitudinally advance and retract the spindle. A pneumatic circuit provides completely automatic drilling to an adjustable depth and a positive retraction of the spindle. This circuit is novel in that it is contained internally within certain of the drill frame members.

REFERENCES:
patent: 3487729 (1970-01-01), Juhasz et al.
patent: 4111590 (1978-09-01), Burkart et al.
patent: 4182588 (1980-01-01), Burkart et al.
patent: 4329092 (1982-05-01), Ponitzsch
patent: 4371297 (1983-02-01), Hirose

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