Percussive blow assisted rotary drill

Details Percussive blow assisted rotary drill Percussive blow assisted rotary drill

1996-12-09

1998-07-14

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

408227, 408224, 408225, 175389, 175395, 175415, B23B 5100

Patent

active

057794030

ABSTRACT:
A percussive blow assisted rotary drill includes an axially extending shank (1) with a leading end face (3) and an axially extending outside surface (2) containing a helically extending drilled material removal groove (4, 5). At least one hard metal cutting plate (6) extends across a diameter of the shank and has a base part fixed in a continuous groove (9) in the leading end face (3) of the shank (1). The base part (10) is reinforced by an outwardly extending projection (12) in at least one of its side surfaces extending across the shank diameter. Preferably, the projections forms a part of a circle and are centered between the opposite ends of the cutting plate. The continuous groove (9) has a recess in at least one of its side surfaces shaped to coincide with the shape of the outward projection (12) on the cutting plate. Accordingly, the base part (10) is secured in a positively locked manner and preferably is centered in the leading end face of the shank.

REFERENCES:
patent: 748890 (1904-01-01), Taylor et al.
patent: 3966349 (1976-06-01), Osman et al.
patent: 4293252 (1981-10-01), Kress et al.
patent: 4549616 (1985-10-01), Rumpp et al.
patent: 4596498 (1986-06-01), Kress
patent: 5154550 (1992-10-01), Isobe et al.
patent: 5443337 (1995-08-01), Katayama

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