Hollow crown drill with end face cutting members

Details Hollow crown drill with end face cutting members Hollow crown drill with end face cutting members

1993-12-15

1995-05-23

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having axial, core-receiving central portion

408703, B23B 5104

Patent

active

054175267

ABSTRACT:
A hollow crown drill has a set of cutting members (2, 3, 4) positioned on the leading or cutting end of an annular axially extending carrier member (1). The radial width of the cutting faces (2a, 3a, 4a) of the cutting members (2, 3, 4) increases opposite to the rotational direction (D) of the carrier member (1). In addition, the cutting members (3, 4) in the set disposed counter to the rotational direction (D) are offset in the direction parallel to the axis of the carrier member relative to the cutting member of the set leading in the rotational direction. This dimensional feature relates to the increase in the size of the cutting faces (2a, 3a, 4a). With the cutting faces (2a, 3a, 4a) dimensioned as above, each of the cutting members penetrates deep into the material being drilled, so that if the usual contact pressure forces are applied abrasive wear resulting in premature failure of the hollow crown drill does not occur.

REFERENCES:
patent: 3403526 (1969-03-01), Valenziano
patent: 3548687 (1970-12-01), Holloway
patent: 4591303 (1986-05-01), Sato et al.
patent: 4767245 (1988-08-01), Shoji et al.

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