Conversion device for converting a rotational motion into a reciprocal motion

A conversion device structured to be coupled to the rotating axle of a motor and to an output assembly, said output assembly having an elongated shaft with an axis extending generally perpendicular to the axis of said motor axle, said output assembly further being coupled to a frame to resist movement in an axial direction, said conversion device comprising:

• an eccentric hub having a disk with a perimeter and a sidewall extending from said perimeter forming a recess;
• said disk structured to be coupled to said motor axle;
• a yoke having a shaft and an attachment pin;
• said yoke shaft disposed within said eccentric hub recess;
• said attachment pin pivotally coupled to said output assembly;
• said sidewall includes a thick portion and a thin portion;
• said thick portion and said thin portion disposed on generally opposite side of said disk;
• wherein the transition along said sidewall from said thick portion to said thin portion is gradual;
• said sidewall has an inner bearing surface and an outer bearing surface;
• said yoke shaft coupled to said inner bearing surface;
• and
• wherein said outer bearing surface is a constant distance from the axis of said disk and said inner bearing surface is further from the axis of said disk at said thin portion and closer to the axis of said disk at said thick portion.

An assembly for converting a rotational motion along a first axis to a reciprocating rotational motion along an axis perpendicular to the first axis, said assembly comprising:

• a frame;
• a motor having an output axle structured to rotate about a first axis;
• said motor coupled to said frame;
• an output assembly having an elongated shaft with an axis extending generally perpendicular to said axle axis;
• said output assembly coupled to said frame and structured to rotate axially and be restrained from moving in an axial direction;
• a conversion device coupled to said axle and to said output assembly shaft, said conversion device comprising:
• an eccentric hub having a disk with a perimeter, and a sidewall extending from said perimeter forming a recess;
• said disk coupled to said motor axle;
• a yoke having a shaft and an attachment pin;
• said yoke shaft disposed within said eccentric hub recess;
• said attachment pin pivotally coupled to said output assembly;
• a first roller bearing disposed between said frame and said eccentric hub;
• and
• a spherical bearing disposed between said yoke shaft and said sidewall.