Stabilized apparatus for converting rotational motion to linear motion

Apparatus for converting rotational motion to linear motion and for varying the conversion ratio from rotational to linear which comprises a screw shaft having a primary screw shaft thread, a nut surrounding said screw shaft, said nut having an inner surface and a primary nut helical thread on said inner surface, at least one planetary roller having threads interposed between and meshing with said nut helical thread and said screw shaft thread, means for maintaining said nut and screw shaft concentric, said planetary roller having a secondary locking thread path, said secondary locking thread path intersecting the primary thread path on said planetary rollers and one of said screw shaft or nut having a secondary locking thread and said secondary locking thread being positioned to fit only with a locking thread path during rotation of said planetary rollers, and means for changing the effective pitch diameter of said planetary roller while said planetary rollers are rotating.

Apparatus for converting rotational motion to linear motion and for varying the conversion ratio from rotational to linear which comprises a screw shaft having a primary screw shaft thread, a nut surrounding said screw shaft, said nut having an inner surface and a primary nut helical thread on said inner surface, at least one planetary roller having threads interposed between and meshing with said nut helical thread and said screw shaft thread, means for maintaining said nut and screw shaft concentric, said planetary roller having a secondary locking thread path, said secondary locking thread path intersecting the primary thread path on said planetary rollers and one of said screw shaft or nut having a secondary locking thread said secondary locking thread intersecting the primary thread of said screw shaft or said nut, and said secondary locking thread being positioned to fit only with a locking thread path during rotation of said planetary rollers, and means for changing the effective pitch diameter of said planetary roller while said planetary rollers are rotating.

Apparatus for converting rotational motion to linear motion which comprises a screw shaft having a primary screw shaft thread, a nut surrounding said screw shaft, said nut having an inner surface and a primary nut thread on said inner surface, at least one planetary roller having primary threads, means for maintaining said nut and screw shaft concentric, said planetary rollers being interposed between and meshing with said primary nut helical thread and said primary screw shaft thread, said planetary rollers having a secondary locking thread, said nut having a secondary locking thread path, said screw shaft having a secondary locking thread path intersecting the primary thread path on said screw shaft and secondary locking thread being positioned to fit only with the locking thread paths during rotation of said planetary rollers.