Portable dowel boring tool

Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support

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Details

408112, 408115R, B23B 4514

Patent

active

055868460

ABSTRACT:
The dowel-hole boring device drills dowel receiving holes at a predetermined angle and depth. The device has a body with a first and second end. A first interior channel opens to the first end and a second interior channel, contiguous to the first channel, opening to the second end. The first interior channel has a diameter less than the second interior channel, the reduction in diameter forming a step. A pair of bearings have an interior diameter slightly greater than the shaft and an exterior diameter slightly less that than of the first interior channel. The shaft is configured to prevent rotation within the bearings. The shaft has a drill bit at one end and a recess at the other. The body of the shaft has a receiving groove to receive a securing ring. A spring, over the shaft, maintains the separation between the bearings at a predetermined distance. Locking channels and locking screws come in contact with the bearings locking them in place. The shaft is axially movable within the bearings. A guide panel is proximate the second end.

REFERENCES:
patent: 2170211 (1939-08-01), Osborne
patent: 2597152 (1952-05-01), Kornmayer
patent: 2798520 (1957-07-01), Maskulka et al.
patent: 3362447 (1968-01-01), Elder, Jr.
patent: 3788759 (1974-01-01), Grunert
patent: 3907452 (1975-09-01), Tripp
patent: 3973784 (1976-08-01), Smith
patent: 5076742 (1991-12-01), Lee et at.
patent: 5217331 (1993-06-01), Ericksen
patent: 5419662 (1995-05-01), Ericksen

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