Paper drill

Details Paper drill Paper drill

1984-04-27

1986-12-30

Schran, Donald R.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having axial, core-receiving central portion

408204, 408232, 279 48, B23B 5104

Patent

active

046326111

ABSTRACT:
A drill for a paper drilling machine. The drill is made of two separate parts, namely a cutting bit of hollow generally cylindrical form having an annular cutting edge at one end, and a hollow cylindrical sleeve which receives the opposite end portion of the bit and which is itself received in a collet assembly of a drill spindle of the machine. The sleeve is radially compressible and is compressed by the collet assembly to frictionally grip the bit and permit transmission of drilling torque from the drill spindle to the bit in use.

REFERENCES:
patent: 1233613 (1917-07-01), Schreurs
patent: 1348190 (1920-08-01), Wahl
patent: 1557464 (1925-10-01), Mick
patent: 2606615 (1952-08-01), Pevey et al.
patent: 2978250 (1961-04-01), Abadjieff

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