Back-side taper wedging drive system

In a multilobular drive system of the type having a female member having an arrangement of flutes, a male member having an arrangement of lobes engageable with corresponding flutes of said female member, a central axis extending generally coincidentally through said female member and said male member, and threads on one of said members defining a rotational drive direction, one of said arrangement of flutes and said arrangement of lobes having a first drive wall and a parallel trailing wall on each of said flutes or lobes, each of said first drive walls and said parallel trailing walls being positioned substantially parallel to said central axis;

• the other of said arrangement of said flutes and said arrangement of said lobes having at least one second drive wall and at least one tapered trailing wall opposite said second drive wall, said at least one tapered trailing wall forming an angle with said second drive wall, said tapered trailing wall producing a wedging engagement with a respective one of said parallel trailing walls when said arrangement of flutes and corresponding lobes are engaged.

In a multilobular drive system of the type including a female member having an arrangement of flutes and a male member having an arrangement of lobes engageable with corresponding flutes of said female member, a central axis extended generally coincidentally through said female and male members, and threads on one of said male or female members defining a rotational drive direction, said female component including a multilobular recess and said male component including a multilobular projection engageable with said recess;

• said multilobular recess ad said multilobular projection defining alternating, interengageable flutes and lobes;
• the flutes and lobes on one of sad female or male members having first drive walls and parallel trailing walls positioned substantially parallel to said central axis;
• the other of said members having flutes and lobes defining second drive walls and at least one tapered trailing wall with said tapered trailing wall forming an angle with the associated second drive wall, said tapered trailing wall providing a wedging engagement with the interengageable lobe on the other of said members, when said members are engaged.