US Patent Issued to Hilti on Feb. 17 for "Impact tool" (Chinese, German Inventors)

ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,551,994, issued on Feb. 17, was assigned to Hilti AG (Schaan, Liechtenstein).

"Impact tool" was invented by Cheu Chyong Teh (Shanghai), Quirin Wahle (Jengen, Germany) and Jim Chen (Shanghai).

According to the abstract* released by the U.S. Patent & Trademark Office: "An impact tool, including a casing, a drive disposed in the casing, a main shaft and a gear assembly connected to the drive, a hammer assembly connected to the gear assembly and main shaft, and an anvil, the main shaft defining a rotation axis around which the hammer assembly and anvil can rotate, the anvil having a head and a stem part, the stem part being substantially cylindrical, and at least one lug extending radial...