ALEXANDRIA, Va., May 19 -- United States Patent no. 12,631,034, issued on May 19.
"Hammer drill attachment" was invented by Ryan William Browne (Alexandra Headland, Australia).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention provides a hammer drill attachment for contacting external walls of formwork for imparting external vibration to concrete poured into the formwork, the attachment comprising: an input shaft configured to receive motion from an output of a hammer drill; an output shaft configured to contact the external walls of the formwork for imparting the external vibration, the output shaft being arranged transversely relative to the input shaft to output pulsed percussions in a tr...