Patent ID: 11911887
Assignee: INGERSOLL-RAND INDUSTRIAL U.S., INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. An impact tool comprising:
a swinging weight impact mechanism comprising a hammer frame supporting a hammer that rotates about a first axis, the hammer being pivotably coupled to the hammer frame such that the hammer is also configured to pivot about a second axis different from the first axis, and an anvil configured to rotate about the first axis when impacted by the hammer;
an electric motor comprising a rotor that is directly coupled to the swinging weight impact mechanism, the electric motor being configured to drive rotation of the hammer about the first axis in a first direction; and
a control circuit configured to control a current supplied to the electric motor, the control circuit including a modulation circuit configured to modulate the current and a current measurement circuit configured to measure successive modulation cycles of the current and to disable the current to the electric motor for the remainder of a modulation cycle when the current exceeds a specified threshold;
wherein the rotor is directly coupled to the swinging weight impact mechanism such that rotation of the rotor in the first direction rotates the hammer in the first direction, and when the hammer stops rotating in the first direction the rotor is concurrently stopped rotating in the first direction.