US 5,630,683 A · Chip breaker drill bushing assembly

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).

Claims28

Dependent claims

A chip breaker drill bushing assembly comprising:

(a) a drill bushing housing including a body and an outwardly protruding guide shaft, said guide shaft including a tip having a hole for receiving a drill bit, said guide shaft including at least one chip disposal aperture located between said tip and said body;
and
(b) a sleeve located in said body, in alignment with said guide shaft, the end of said sleeve facing the tip of the guide shaft including a chip breaker, said chip breaker including at least one helical trough that protrudes into said sleeve and is aligned with said at least one chip disposal aperture.

Dependencies are inferred from the claim text.

Chip breaker drill bushing assembly

Life of this patent

Chip breaker drill bushing assembly

Life of this patent

Abstract

Claims28