Apparatus for making a drilled hole with an undercut

Details Apparatus for making a drilled hole with an undercut Apparatus for making a drilled hole with an undercut

1994-08-29

1996-08-13

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool-support with means to move tool relative to tool-support

To move radially

82 12, 408159, 408180, 408236, B23B 4100

Patent

active

055449891

ABSTRACT:
The drilling apparatus for making a drilled hole with an undercut includes a drive device for rotating a hollow drilling shaft (3); a drill bit holder (23,38) held in the hollow drilling shaft (3); a drill bit (4,26) having a drilling head provided with laterally projecting cutting edges (25) projecting from the drill bit holder (23,38); a device for swivelling out the drill bit holder (23, 38) with the drill bit from a drilling center line (5) including at least one control element of the drill bit holder, a sliding sleeve (11) surrounding the drilling shaft (3) and a swivelling-out element (21,39) connected to the movable sliding sleeve and engaging the control element to swivel out the drill bit holder (23, 38); and a device for raising and lowering the drive device (2) together with the drill bit holder (23,38) and the drill bit (4,26). In one embodiment the swivelling-out element is a sliding block and the control element is a cam surface in a slot provided in the drill bit holder.

REFERENCES:
patent: 2168176 (1939-01-01), Shaw
patent: 2734402 (1956-02-01), Hoern
patent: 2818753 (1958-07-01), Leggett
patent: 3017791 (1962-01-01), Fried
patent: 3021733 (1962-02-01), Cogsdill
patent: 5226763 (1993-07-01), Lind

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