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:
Mar. 17, 1987
Filed:
Sep. 19, 1984
Applicant:
Inventor:
Dionizy Simson, Winterthur, CH;
Assignee:
Simson and Partner, Winterthur, CH;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B25D / ;
U.S. Cl.
CPC ...
173 91 ; 173134 ; 1731 / ; 173116 ; 175 56 ; 9121 / ; 9211 / ;
Abstract
A driving and extracting apparatus has a hammer frame within which a reaction mass is freely movable. The reaction mass is caused to reciprocate within the hammer frame by the selective application of drive pressure to opposite drive cylinders at a frequency corresponding to the natural frequency of the mass. A pneumatic spring at each end of the reaction mass prevents contact between the reaction mass and the ends of the hammer frame. Sensors in the hammer frame detect the position of the reaction mass and adjust the pneumatic springs accordingly.