screw jack

noun

screw jack

a lifting device utilizing the mechanical advantage of a screw thread, the effort being applied through a bevel drive Also calledjackscrewjack

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First recorded in 1710–20

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They include a screw jack manufacturer in Ohio and a home health care business in Michigan.

The forward end of each section was supported by a screw jack placed under a rib 2 ft. from the front end.

The shells of the molds were of ¼-in. steel plate; the jack was an ordinary screw jack.

Between these guide posts set plunger posts which were raised and lowered by screw jacks.

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