Chip breaker drill bushing assembly

Details Chip breaker drill bushing assembly Chip breaker drill bushing assembly

1995-11-30

1997-05-20

Howell, Daniel W.

Cutting by use of rotating axially moving tool

With product handling or receiving means

408 72B, 408241B, B23B 4902

Patent

active

056306830

ABSTRACT:
A chip breaker drill bushing assembly (11) for a fluted drill bit (37) is disclosed. The assembly comprises a drill bushing housing (13) and a sleeve (15). The drill busing housing (13) includes a body (17) and an outwardly protruding guide shaft (19). The guide shaft has a smooth end (31) for tightly contacting the surface of a work piece (63) to be drilled. The sleeve (15) is located in the body (17) of the housing (13), in alignment with the guide shaft. The end of the sleeve (15) facing the tip (29) of the guide shaft (19) includes a chip breaker (41). The chip breaker (41) includes two spaced-apart teeth (46a, 46b) that are defined by two helical troughs (47a, 47b) that protrude into the sleeve (15). The two helical troughs (47a, 47b) are aligned with two longitudinal apertures (33) in the outwardly protruding guide shaft (19).

REFERENCES:
patent: 2669889 (1954-02-01), Huller
patent: 3874808 (1975-04-01), Zaccardelli et al.
patent: 4514120 (1985-04-01), Hougen
patent: 5108241 (1992-04-01), Coss

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