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. 06, 1994
Filed:
Jan. 25, 1994
Applicant:
Inventors:
Timmo Sippus, Lahti, FI;
Seppo Jurvanen, Lahti, FI;
Assignee:
Bretec OY, Lahti, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B25D / ;
U.S. Cl.
CPC ...
173211 ; 1731621 ;
Abstract
A hydraulic impact hammer comprises a protective casing, a hydraulically operated piston and a member for guiding the piston, and an impact member and a member for guiding the impact member. The piston-guiding member and the member guiding the impact member are made separate with respect to each other in order to prevent propagation of the tension wave reflected from the impact member. However, the piston-guiding member and the member guiding the impact member are each connected to the protective housing through at least one attenuating element.