Portable handheld device for forming aligned holes

Details Portable handheld device for forming aligned holes Portable handheld device for forming aligned holes

1981-06-04

1984-10-02

Bilinsky, Z. R.

Cutting by use of rotating axially moving tool

With work-engaging structure other than tool or tool-support

Movable relative to tool along tool-axis

408146, 408204, 408705, 408226, B23B 4514

Patent

active

044745133

ABSTRACT:
Portable handheld device for electricians, plumbers and builders to use to form in one operation perfectly aligned, craftsman-like holes through a soffit and a roof above, or through a ceiling and a roof above, through which aligned holes an electrical conduit, soil stack or vent pipe, chimney pipe, or the like, may be installed.

REFERENCES:
patent: 715448 (1902-12-01), Wilson, Jr.
patent: 921644 (1909-05-01), Forster
patent: 939900 (1909-11-01), Forster
patent: 2448369 (1948-08-01), Heintz et al.
patent: 2721592 (1955-10-01), Baker
patent: 2812791 (1957-11-01), Mackey
patent: 3011369 (1960-11-01), Russell
patent: 3138183 (1964-06-01), Stewart
patent: 3865502 (1975-02-01), Hamann
patent: 3884593 (1975-05-01), Christoffer
patent: 4076444 (1978-02-01), Siebrecht

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