Countersink core drill assembly and method of utilizing same

Details Countersink core drill assembly and method of utilizing same Countersink core drill assembly and method of utilizing same

1984-03-12

1985-11-05

Weidenfeld, Gil

Cutting by use of rotating axially moving tool

Tool or tool with support

Having axial, core-receiving central portion

175330, 408 59, B23B 5104

Patent

active

045510458

ABSTRACT:
Disclosed is a core drill assembly and method of using the same to drill a countersunk hole through a concrete slab, wall or the like masonary member. The assembly utilizes concentric inner and outer core drills, the longer smaller one of which is provided with flushing fluid outlets rearwardly of the front end of the outer or countersink drill and provided with closure means for confining fluid flow to the inner drill when that drill is in use, and for diverting the flow to the outer drill while performing the countersink operation. The two drills have separate coupling facilities thereby permitting the substitution of drills of any selected relative sizes.

REFERENCES:
patent: 2389512 (1945-11-01), Humason
patent: 2490512 (1949-12-01), Deely
patent: 2545195 (1951-03-01), Crake
patent: 2587231 (1952-02-01), Schierding
patent: 2599770 (1952-06-01), Marcerou
patent: 3543613 (1970-12-01), Obloy
patent: 3778179 (1973-12-01), Rivas
patent: 3833073 (1974-09-01), Carver

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