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Document Number
US Patent 6910838
Issued Date
June 28, 2005
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Inventors
Fuss; Mathias (Leinfelden-Echterdingen,DE)
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Abstract
A rock drill for rotary hammers is proposed in which a conveying helix (3) having main and secondary webs (6 to 9) is used. A one-piece carbide crown, with its wing-shaped main and secondary lips (24 to 27), is butt-welded to the conveying helix.
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Number of Claims:
14
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Owner
Hawera Probst, GmbH (Ravensburg,DE)
Published
June 28, 2005
Application Number
10/220,243
Filed
August 30, 2002
US Classification
408/230   175/394 175/415 175/420.2
Int'l Classification
B23B   51/02   (20060101)   E21B   10/44   (20060101)   E21B   10/00   (20060101)  
Attorney/Law Firm
Priority Data
Mar 02, 2000 [DE] 100 09 732
USPTO Field of Search
175/385   175/389   175/394   175/395   175/398   175/414   175/415   175/426   175/427   175/428   175/420.1   175/420.2   408/227   408/229   408/230  
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