US Patent 7628232 Rotary-percussion drill with a four-start helical shaft

Patent 7628232 was granted and assigned to Hilti on December, 2009 by the United States Patent and Trademark Office.

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Patent

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Current Assignee

Hilti

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7628232

Date of Patent

December 8, 2009

Patent Application Number

11796737

Date Filed

April 27, 2007

Patent Primary Examiner

‌

David J. Bagnell

Patent abstract

A rotary-percussion drill includes a four-start helical shaft (3) having a fourfold rotationally and mirror-symmetrical helix cross-section, with radially projecting convexly formed helical webs (4) extending from a concave groove bottom (5) up to the envelope circle (6) and having an undercut (7) with respect to a web width (S).

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