Rotary/linear convertor

A rotary/linear converter comprising:

• a first member having a central axis and being adapted for linear movement in the direction of said central axis;
• a second member adapted for rotational movement;
• connecting means operatively interconnecting said first and second members so that respective linear or rotational movement of one said member causes respective linear or rotational movement of the other said member;
• characterized in that said connecting means comprises:
• a connecting shaft disposed eccentrically of said central axis of said first member;
• first coupling means operatively connecting said first member to said connecting shaft such that axial reciprocation of said first member causes orbital movement of said connecting shaft and vice versa;
• and
• second coupling means operatively connecting said connecting shaft to said second member so that said orbital movement of said connecting shaft causes rotation of said second member and vice versa, wherein said first coupling means comprises a sleeve operatively connected to said first member for axial reciprocation therewith, said sleeve being associated with said connecting shaft for axial reciprocation relative thereto and at least one link member extending between said sleeve and a mounting which is in a fixed position.