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:
Jan. 28, 2003
Filed:
May. 26, 2000
Applicant:
Inventor:
Daniel E. Tyrrell, Ravenna, OH (US);
Assignee:
Nippon Pneumatic Mfg. Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B25D 1/700 ;
U.S. Cl.
CPC ...
B25D 1/700 ;
Abstract
An improved bushing for a heavy duty hydraulic hammer provides increased bushing life and provides cooler operation for the hammer. A Polymeric bushing is positioned near the lower end of the tool holder of a hammer surrounding the tool. The polymeric bushing is protected by a steel ring below the polymeric bushing preventing foreign objects from impacting upon the polymeric bushing.