PERCUSSION TOOL Russian patent published in 2014 - IPC B25B21/02 B25B23/14 

FIELD: process engineering.

SUBSTANCE: invention relates to percussion-type tools. This comprises hammer revolved by drive motor, anvil revolved by hammer driving force, end tool attached to said anvil, impact detector, motor rpm variator and main switch. The latter adjusts the motor rpm in compliance with the amount of trigger shift. Note here that at torque smaller than preset magnitude is applied to anvil from outside hammer is disengaged from said anvil to idle and to apply impact to said anvil in direction of rotation after idling through preset angle. Note also that detector detects the impact start at anvil rotation in appropriate direction for rpm variator changes motor rpm to lower magnitude lower that motor rpm before impact. Note that when motor is engaged before impact and when motor is changed to lower rpm, motor rpm can be adjusted to comply with trigger shift amount.

EFFECT: higher safety and efficiency.

5 cl, 5 dwg