Abstract: The rotary torque boosting device includes a main body with an inertia flange to be assembled or made as one piece structure with the main body, an input member having an input recess for receiving the anvil of the impact wrench, an output recess for receiving a detachable driving anvil made to accommodate the impact socket with the same driving head type and dimension which to be secured with a retaining device for easy replacement, such as a magnet unit adhered at the bottom of the recess or an inner retaining groove by the side for receiving the ball retainer or a retaining ring on the driving anvil. The rotary torque boosting device will solve the drawback of the prior art especially the driving anvil will not be held durable enough under the magnified torque induced by the inertia effect during operation.

Abstract: In a torque control system and method for power impact torque tool, first establish a curve showing the relationship between the high/low working voltages of the tool in normal operation and the high/low torque values that are correspondingly output by the tool at the high/low working voltages. Input a target torque value that falls between the highest and the lowest torque value on the relationship curve to obtain a working voltage corresponding to the target torque value for performing a tightening operation. During the tightening process, a microprocessor of a torque control device receives and uses sensing signals instantly and continuously sent by a torque sensing device and changes in voltage, current and motor temperature continuously detected by a voltage/current sensing element and a temperature sensing element to stably control, via a voltage control module, the working voltage within a preset allowable range of variation for tightening torque control.

Abstract: A method and a rotary torque boosting device used with a power rotary type impact wrench boost the output torque to drive a socket or fastener during operation. The rotary torque boosting device includes a main body with an input member having an input recess for receiving the anvil of the impact wrench, an output member having an output anvil for receiving the socket or fastener and a detachable disc exterior inertia member, to be secured with a retaining device for easy replacement. The inertia member is designed with a various moment of inertia and detachable to be assembled on the exterior surface of the main body for increasing the output torque of the tool during operation.