ALEXANDRIA, Va., Dec. 9 -- United States Patent no. 12,491,660, issued on Dec. 9, was assigned to HESS GROUP GMBH (Burbach-Wahlbach, Germany).
"Vibration device with self-adjusting impact bars" was invented by Ralf Hahs (Bad Marienberg, Germany) and Sebastian Bergmann (Hochstenbach, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a vibration device with a vibrating table for a concrete block manufacturing machine for compression of a material to be compressed. The vibration device is at least partially resiliently mounted on a machine frame and driven by at least one electric motor. As a result the vibrating table can be set in a predominantly vertical vibrating movement, wherein the vibr...