Concrete drill

Details Concrete drill Concrete drill

2006-06-06

2006-06-06

Gay, Jennifer H. (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

C175S417000

Reexamination Certificate

active

07055633

ABSTRACT:
A concrete drill for a rotary and percussively driven hand tool machine with a cutting part (1) and a striking part (2) that is axially and limited displaceable relative to the cutting part (1). Each of the cutting part (1) and the striking part (2) have a respective facial surface work area for machining a bore hole surface. The respective facial surface work area of the cutting part (1) and the striking part (2) radially overlap upon rotation of the concrete drill.

REFERENCES:
patent: 1863928 (1932-06-01), Macdonell
patent: 2859941 (1958-11-01), Carroll et al.
patent: 3259403 (1966-07-01), Hjalsten et al.
patent: 3842920 (1974-10-01), Barnetche-Gonzalez
patent: 4852672 (1989-08-01), Behrens
patent: 0732395 (1943-02-01), None
patent: 732395 (1943-03-01), None
patent: 9211782 (1993-03-01), None
patent: 1217165 (2002-06-01), None

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