screw jack


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Related to screw jack: Scissor jack

screw jack

[′skrü ′jak]
(mechanical engineering)

jackscrew

A jack in which a screw is used for lifting; carries a plate which bears on the load.

jackscrew

jackscrew
A jack operated by a screw mechanism. Normally, it is used for raising light aircraft and lighter loads. Also known as a screw jack.
References in periodicals archive ?
The large screw jack utilizes three-foot 3/8x16 threaded rods.
Test results indicated that the screw jacks failed at load and configuration combinations that were unlikely to have occurred prior to the collapse, This led investigators to conclude that the screw jack failures discovered in the debris likely occurred during the bridge collapse and did not cause it.
The screw jacks are said to be suitable for materials handling in sectors such as printing and carmaking.
The screw jacks are basically levelers," Hall explains.
Nook ActionJac Worm Gear Screw Jack lift systems -- like the kind used to lift the piano man's piano -- are durably built and produced in standard models with load handling capacities from 1/4 ton to 100 tons.
The principle of the wedge is also found in V-belts, and the screw jack.
5-tonne electric-motor-driven screw jack and traveling nut arrangement.
The Mytho A automatic pallet stretch wrapper installed uses a unique screw jack principle to raise and lower the film carriage.
The screw jacks are arranged in a U configuration with a speed-increasing 1:5 worm gearbox based on a screw jack gearbox used as the primary drive.
Metal jacks came in a wide range of sizes, from the small screw jack for automotive use to heavy railroad jacks.
Also included are: electric screw jack lift; 50 psig jacket for heating or cooling; 1" flush type discharge valve; 316 ss wetted parts; 150 grit sanitary finish to enable easy cleaning; 1/2 hp drive; reversible agitator blade; and 2-2" sight and charge ports in cover.
A screw jack enables the operator to raise and lower the PolyPorter to level the pipe with the fusion machine in uneven terrain.