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A driven worm acts on an internal worm gear, which in turn drives a lifting
screw to extend or retract. As the lifting screw translates through the body
of the jack, inherent screw rotation is prevented by an attached load or
mounting structure that is anchored to resist rotation.
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Some loads do not prevent lifting screw rotation-these applications require
a keyed jack. A key, fixed to the jack housing and inserted into a keyway
milled into the lifting screw, forces the lifting screw to translate without
rotating. Several dimensions of keyed jacks differ from normal jacks-check
the keyed jack drawings for each jack model.
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A keyed for traveling nut jack (sometimes referred to as
a rotating screw jack) features a lifting screw keyed to the worm gear as
a single unit, forcing the lifting screw to rotate, but not translate. A
flanged traveling nut, attached to the load, is driven by the rotation
of the lifting screw. This type of jack is ideal for applications that
cannot accommodate a screw protection tube or require a flush mount.
Refer to the keyed for traveling nut dimensional drawing for each jack model.
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