US 12,138,766 B2 · Impact power tool

Abstract

An impact power tool includes a transmission output shaft, a rotary impact assembly with a cam shaft, hammer, and anvil, and a tool output shaft rotatable with the anvil. A coupler removably couples the cam shaft to the transmission output shaft. When torque on the tool output shaft is less than or equal to a first threshold, the transmission output shaft, cam shaft, hammer, and anvil rotate together to transmit torque to the tool output shaft. When torque on the tool output shaft is above the first threshold, the hammer moves along the cam shaft away from the anvil by a first distance and applies rotary impacts to the anvil. When the hammer moves along the cam shaft away from the anvil by a second distance greater than the first distance, the coupler decouples the transmission output shaft from the cam shaft, interrupting torque transmission to the tool output shaft.

Claims20

Dependent claims

An impact power tool comprising:

a housing;
a motor received in the housing;
a transmission drivable by the motor;
an impact assembly including a rotatable cam shaft, a hammer coupled to the cam shaft for axial and rotational movement relative to the cam shaft, a rotatable anvil, and a spring biasing the hammer toward the anvil, the hammer configured to transmit continuous rotational torque to the anvil when an output torque is less than a first torque threshold and to apply rotational impacts to the anvil when the output torque is greater than or equal to the first torque threshold;
a coupler configured to releasably couple the cam shaft to the transmission to transmit torque from the transmission to the cam shaft, the coupler configured to decouple the cam shaft from the transmission when the hammer moves along the cam shaft away from the anvil by greater than a first distance, interrupting torque transmission from the transmission to the cam shaft.

2 more elements

Dependencies are inferred from the claim text.

Impact power tool

Life of this patent

Impact power tool

Life of this patent

Abstract

Claims20