Wikipedia
A hammer drill, also known as a "rotary hammer", "roto-drill" or "hammering drill", (see also rotary drill) is a rotary drill with a hammering action. The hammering action provides a short, rapid hammer thrust to pulverize relatively brittle material and provide quicker drilling with less effort. These tools are usually electrically powered, and increasingly powered by batteries. The same technology is also used in electric "demolition hammers", also known as "chipping guns" or "breakers".
Usage examples of "hammer drill".
They were still shouting when the churn of a propeller close alongside drowned all sound, merging with the heavy beat of an engine's exhaust so close beside me and so loud that it seemed like a hammer drill attacking the walls of my prison.
She crouched by the stockade gate, her heart beating like a hammer drill, clutching the shortest, sharpest thrusting spear she could find.
Instead, a dust-covered figure clad in a zippered blue overall and carrying a heavy industrial hammer drill in both hands like a weapon climbed through the aperture, trailing cable behind him.