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:
Dec. 23, 1986
Filed:
Nov. 01, 1984
Applicant:
Inventor:
Paul Dummermuth, Zunzgen, CH;
Assignee:
Von Arx AG, Sissach, CH;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B25D / ;
U.S. Cl.
CPC ...
173131 ; 173128 ; 173 51 ; 29 8 / ;
Abstract
A pneumatic hammer comprises a cylindrical housing, in which are a free piston, an anvil, and needles the rear ends of which end in heads designed to rest against the anvil and supported by a tool holder. The anvil comprises a steel cylinder in the lateral surface of which is an annular rebate. The cylinder is surrounded by a plastics material in the rebate, the outer surface of which material forms the cylindrical sliding surface of the anvil. The volume occupied by the plastics material is approximately 50% of the total volume, such that the mass of the anvil is approximately halved.