Drilling machine

Details Drilling machine Drilling machine

1982-11-18

1985-11-26

Weidenfeld, Gil

Cutting by use of rotating axially moving tool

Plural tool-assemblages

Coaxial

408 68, 408204, 408209, B23B 5104

Patent

active

045552037

ABSTRACT:
A drilling machine including a spindle and an elevating hollow shaft rotatable in unison with the spindle. An annular cutter is mounted in axial alignment with the hollow shaft and an elevating center drill is mounted in axial alignment with the annular cutter. The drill is movable to descend relative to the annular cutter to initiate the formation of a center hole in a workpiece prior to drilling. The drilling machine further includes a cylindrical member vertically movable and rotatably supported within a holder with the elevating hollow shaft being vertically movable and rotatably supported within the cylindrical member.

REFERENCES:
patent: 2025536 (1935-12-01), Statz
patent: 2754864 (1956-07-01), Elsy
patent: 2926555 (1960-03-01), Joy
patent: 3825362 (1974-07-01), Hougen
patent: 4090804 (1978-05-01), Haley
patent: 4193721 (1980-03-01), Hougen
patent: 4204783 (1980-05-01), Hougen
patent: 4288183 (1981-09-01), Kato
patent: 4385853 (1983-05-01), Strange et al.
patent: 4408935 (1983-10-01), Miyanaga

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