Hollow crown drill

Details Hollow crown drill Hollow crown drill

1997-11-25

1999-11-09

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having axial, core-receiving central portion

175 20, 175244, 175394, 175403, 408145, 408207, 408703, B23B 4102

Patent

active

059801689

ABSTRACT:
A crown drill including a hollow cylindrical carrier body, which is formed of two coaxially arranged tubes connected with each other, and a cutting member attached to the carrier body and projecting axially beyond the leading end of the carrier body.

REFERENCES:
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patent: 3095049 (1963-06-01), Berger
patent: 3153885 (1964-10-01), Keller et al.
patent: 5082070 (1992-01-01), Obermeier et al.
patent: 5092716 (1992-03-01), Omi
patent: 5281060 (1994-01-01), Strange et al.
patent: 5388655 (1995-02-01), Gruber
patent: 5451126 (1995-09-01), Brun
patent: 5503237 (1996-04-01), Neukirchen
International Application Publication WO/15683 Dec. 27, 1990.
Communication of Mar. 12, 1998, Application No. 97810755.5-2303-to applicant Hilti Aktiengesellschaft from European Patent Office, The Hague.

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