Linear drive with screw and threaded follower

Details Linear drive with screw and threaded follower Linear drive with screw and threaded follower

1997-12-01

1999-05-25

Marmor, Charles A.

Machine element or mechanism

Gearing

Teeth

411432, F16H 2502

Patent

active

059061375

ABSTRACT:
This linear drive has cooperating threaded screw and follower components suited to be rotated relative to one another to create a corresponding axial shift between the components, where the follower is improved by having spaced drive members each threadably cooperating with the screw and capable of carrying the maximum axial linear drive force between the components. Anti-friction structures support the drive members for allowing relatively effortless component rotation, frictionwise, even under this maximum driving force. Ramp structures cyclically expand and contract the axial separation between the drive members, which both generates the maximum axial driving force and effectively shifts the axial driving force alternately between the drive members. The force-carrying drive member will be thread friction bound relative to the screw, and the substantially loadfree drive member will be easily rotatable with the follower rotation suited to be axially advanced along the screw. Relative component rotation and repeated expanding and contracting shift cycles incrementally and alternately advance, with an inch-worm like action, the drive members along the screw to provide the axial shift and force generation between the components, the loadfree drive member being advanced and the force-carrying drive member remaining stationary relative to the screw.

REFERENCES:
patent: 3614900 (1971-10-01), Wahlmark
patent: 3799292 (1974-03-01), Katz
patent: 5426989 (1995-06-01), Uhlmann et al.

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