Rock drill

Details Rock drill Rock drill

2006-04-04

2006-04-04

Howell, Daniel W. (Department: 3722)

Cutting by use of rotating axially moving tool

With signal, indicator, illuminator or optical means

C408S226000

Reexamination Certificate

active

07021872

ABSTRACT:
A rock drill (1) for cutting rock comprising an elongated, helical shaft (2), which has, at one end, an insertion part (3) and, at the end opposite, a tool head (4) with cutters (5) made of hard material, wherein the helical shaft (2) is at least partially coated with a colored layer (7a, 7b) and the layer forms a lengthwise running wear indicator marking (8) inside the helical groove (8).

REFERENCES:
patent: 4904130 (1990-02-01), Gorman
patent: 5303574 (1994-04-01), Mattossian
patent: 6250295 (2001-06-01), Chanton et al.
patent: 2001/0023783 (2001-09-01), Obermeier
patent: 2004/0129125 (2004-07-01), Colquhoun
patent: 1965131 (1971-07-01), None
patent: 3613264 (1996-01-01), None
patent: 4424203 (1996-01-01), None
patent: 19810511 (1999-09-01), None
patent: 19859624 (2000-06-01), None
Rough translation of German 19859624 from Babelfish.altavista website, three pages.
Abstract of Soviet 905417, published Feb. 15, 1982.

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