Patent ID: 11904441
Assignee: BLACK & DECKER, INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. An impact tool comprising:
a housing;
a motor disposed in the housing;
an output spindle;
an impact mechanism coupled to the output spindle and configured to be driven by the motor, the impact mechanism configured to transmit continuous rotary motion without impacts from the motor to the output spindle when a torque on the output spindle does not exceed a transition torque, and to transmit rotational impacts from the motor to the output spindle when a torque on the output spindle exceeds the transition torque while the motor rotates in a single direction; and
a controller electrically coupled to the motor and configured to electrically control power being delivered to the motor wherein the controller is selectively operable in: (a) a normal mode where the controller controls power being delivered to the motor so that the impact mechanism transitions from transmitting continuous rotary motion to transmitting rotational impacts when the transition torque is a first threshold torque; and (b) a control mode where the controller temporarily holds power being delivered to the motor at or below a first power limit, and then allows power delivered to the motor to increase beyond the first power limit, so that the impact mechanism transitions from transmitting continuous rotary motion to transmitting rotational impacts when the transition torque is a second threshold torque that is greater than the first threshold torque.