Concrete drill

Details Concrete drill Concrete drill

2007-04-17

2007-04-17

Nash, Brian (Department: 3721)

Tool driving or impacting

Drive by means reacting to rotating eccentric mass

C173S048000, C173S091000, C173S142000, C173S144000

Reexamination Certificate

active

10497722

ABSTRACT:
A concrete drill for drilling concrete or the like by a diamond bit (5) attached to a front end of a bit drive shaft (4) projected forward from a main body (1) by driving to rotate the bit drive shaft (4) by a drive source (2) contained in the main body (1) in which the main body (1) is provided with a vibrating apparatus (8) for exerting a vibrating force a magnitude which is pulsated to change along the bit drive shaft (4) to the main body (1).

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