Impact wrench

摘要

An electric impact wrench wherein the output shaft of the electric motor which is installed in a synthetic plastic housing can rotate the tool holder through the medium of a two-speed transmission and the output shaft can cause a plunger to repeatedly strike against the tool holder in response to rotation of a crankshaft which can receive torque from the output shaft. The two-speed transmission has several spur gears and the output shaft can drive the crankshaft by way of two bevel gears. The axes of all of the gears are located in a common plane which coincides with the central longitudinal symmetry plane of the housing.