Shuttle transfer system
AssigneeTranTek Inc.
InventorsRoss A. Brown, Guy M. Davis
Life of this patent
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Abstract
The threads of a nut on a multithreaded, high helix lead screw are formed by disposing a nut over a lead screw where the center hole of the nut is larger than the threads of the lead screw. Polymer material is filled into the space between the nut and the lead screw and cured to form a high helix, multithreaded nut which has threads complimentary to the threads of the lead screw.
Claims9
A method of forming the threads (56) of a nut (54) on a multithreaded, high helix lead screw (18) of a nut drive and lead screw assembly (10), said method comprising the steps of disposing a nut (54) having a cylindrical tube (82) and a center hole (84) larger than the diameter of the threads (23) of the lead screw (18) about the lead screw (18), filling the radial space (86) between the center hole (84) and the lead screw (18) with a polymer material, curing the polymer material and forming the high helix multiple threads (56) of the nut (54) complementary to the threads (23) of the lead screw (18) for providing polymer nut threads (56) having a greater radial thickness than the screw threads (23) and multipoint full thread contact completely about the screw (18) and minimizing tolerances between the threads (23,56) of the screw (18) and nut (54) to move the nut (54) at high speeds between the ends of the screw (18).
Dependencies are inferred from the claim text.