Drilling device

Details Drilling device Drilling device

1989-03-28

1990-07-17

Bilinsky, Z. R.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having axial, core-receiving central portion

279 93, 175330, 285401, 403349, 408226, B23B 5104

Patent

active

049417835

ABSTRACT:
A drilling device is made up of a hollow cylindrical retainer and an annular drill bit. One of the retainer and drill bit has recesses for receiving projections on the other so that the two parts can be detachably connected together. Each recess has a first and a second axially extending section with the second section extending circumferentially from the opposite axially extending sides of the first section. Accordingly, the second section forms stop shoulders extending transversely of the axial direction for contacting circumferentially extending edges of the projections. As a result, the retainer can transmit rotary motion to the drill bit in both rotational directions while maintaining the two parts in connected engagement.

REFERENCES:
patent: 1051461 (1913-01-01), Smith
patent: 1873241 (1932-08-01), Wright
patent: 2059496 (1936-11-01), Smith
patent: 2427085 (1947-09-01), Allison
patent: 2693343 (1954-11-01), Darin et al.
patent: 3374696 (1968-03-01), Trevathan
patent: 4474488 (1984-10-01), Pinkerton et al.
patent: 4611662 (1986-09-01), Harrington
patent: 4624608 (1986-11-01), Shiomi et al.

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