Bit for drilling an undercut hole

Details Bit for drilling an undercut hole Bit for drilling an undercut hole

1990-04-24

1991-03-12

Kisliuk, Bruce M.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by longitudinally relatively movable...

175202, 175289, E21B 728, E21B 1032

Patent

active

049989812

ABSTRACT:
A drill bit has an extendable and retractable undercut portion for the drilling of undercut holes, for example to accommodate anchor bolts in concrete.
The device includes a drill bit (18) for drilling an initial hold (B) to a predetermined depth at which stage a flange (12) on a guide sleeve (10) contacts the surface (A) of the workpiece. Further downward movement of the drill bit which is securely attached to a lower shank (4) of a body (1), causes relative upward movement of the guide sleeve (10) around the body (1). This in turn causes drive balls (17) accommodated within the flared upper and (11) of sleeve (10) to move inwardly and force apart tapered surfaces (3) and (6) on the body (1) and a slide sleeve (5) disposed between the shank (4) and sleeve (10). The slide sleeve (5) which carries dependent fingers (22) within flutes (20) along the length of the bit (18), thus moves down relative to the bit, forcing the lower ends of the fingers (22) over tapered lower ends (21) of the flutes, exposing cutting edges (24) on the ends of the fingers to grind an annular undercut groove (C) in the hole (B).

REFERENCES:
patent: 2401515 (1946-06-01), Schutte et al.
patent: 2626023 (1953-01-01), Lear
patent: 3454118 (1969-07-01), White
patent: 4091882 (1978-05-01), Hashimoto
patent: 4444279 (1984-04-01), Kessler et al.
patent: 4497383 (1985-02-01), Ostertag
patent: 4635737 (1987-01-01), Miyanaga
patent: 4700789 (1987-10-01), Velasco
patent: 4930585 (1990-06-01), Noser et al.

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