(57) An impact wrench for using fastening or unfastening fasteners comprises a cylindrical
rotor coupled to a motor shaft, said cylindrical rotor including a projection on its
inner surface, the projection having a circumferential width and an axial length;
an anvil coupled to said cylindrical rotor, the anvil including a hammer member capable
of rocking therein, the hammer member being engageable with said projection; a springloaded
pusher for urging said hammer member towards said projection, wherein a spring support
slides either on a deep cam face or a shallow cam face both produced on said inner
surface of the cylindrical rotor, thereby allowing said spring to become compressed
or relaxed against said hammer member.
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