Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges
Reexamination Certificate
2005-06-28
2005-06-28
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
Tool or tool with support
Having peripherally spaced cutting edges
C175S394000, C175S415000, C175S420200
Reexamination Certificate
active
06910838
ABSTRACT:
A rock drill for rotary hammers is proposed in which a conveying helix (3) having main and secondary webs (6to9) is used. A one-piece carbide crown, with its wing-shaped main and secondary lips (24to27), is butt-welded to the conveying helix.
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Hawera Probst GmbH
Howell Daniel W.
Kinberg Robert
Venable LLP
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