US Patent 10989241 Impact device

An impact device includes a drive assembly, a cam having a ramp and a fall-off, and a follower associated with the cam. During rotation of the cam, one of the cam or the follower axially displaces as the follower traverses the cam and falls off the fall-off to transform the rotary motion of the drive assembly to a reciprocating motion having a saw-tooth shape that includes a gradual retraction and a quick extension. The quick extension creates an impact loading, which can be used, for example, for driving a fastener into a work piece.