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. 15, 2010
Filed:
Sep. 07, 2006
Joseph Purcell, Ennis, IE;
Joseph Purcell, Ennis, IE;
Abstract
The present invention relates to a percussion hammer for enlarging drilled holes. The hammer comprises an external outer wear sleeve (), an inner cylinder () mounted co-axially within the outer wear sleeve (), a tubular torque shaft () disposed axially and centrally of the hammer assembly, and extending longitudinally through the assembly. The hammer further comprises a sliding piston () mounted for reciprocating movement within the inner cylinder () and outer wear sleeve () and about the tubular torque shaft () to strike a hammer bit () for reciprocal movement in a chuck () adjacent a forward end of the hammer assembly. The hammer bit () has a central bore () through which the torque shaft () extends, such that the torque shaft () protrudes forwardly of the hammer.