The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 29, 2004
Filed:
Jan. 22, 2002
Applicant:
Inventors:
Steven W. Wentworth, Brookfield, WI (US);
Robert F. Crane, Oconomowod, WI (US);
Paul W. Hau, Watertown, WI (US);
Assignee:
Earth Tool Company, L.L.C., Oconomowoc, WI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16L 5/518 ; E21B 7/04 ;
U.S. Cl.
CPC ...
F16L 5/518 ; E21B 7/04 ;
Abstract
An impactor for use with a directional boring machine having a drill string connectable to the impactor for pulling the impactor through an existing pipeline uses rotation of the drill string to drive an internal striker. The internal striker delivers impacts in the pulling direction to an impactor housing as the impactor housing tows a replacement pipe behind it. The impactor housing is free to move axially in response to impacts from the striker over a limited distance in the pulling direction independently of the replacement pipe and drill string.