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%ما هو (من)٪ 1 - تعريف
MECHANICAL LIFTING DEVICE OPERATED BY TURNING A LEADSCREW
Screw jack; Jack-screw; Jack screw; Screw jacks; Jackscrews
![In the 19th century, the [[Raising of Chicago]] involved entire city blocks being lifted with jackscrews.](https://commons.wikimedia.org/wiki/Special:FilePath/Briggs house.jpg?width=200 "In the 19th century, the [[Raising of Chicago]] involved entire city blocks being lifted with jackscrews.")
![A [[leadscrew]] operates this automotive scissor jack.](https://commons.wikimedia.org/wiki/Special:FilePath/Jackscrew.gif?width=200 "A [[leadscrew]] operates this automotive scissor jack.")
![An electronics module mounted on the back of a large [[electrical connector]] incorporating two very long T-handle jackscrews](https://commons.wikimedia.org/wiki/Special:FilePath/PDP-5 4k by 12 bit core.jpg?width=200 "An electronics module mounted on the back of a large [[electrical connector]] incorporating two very long T-handle jackscrews")
Jackscrew
·noun A jack in which a screw is used for lifting, or exerting pressure. ·see ·Illust. of 2d Jack, ·noun, 5.
Jackscrew
A jackscrew, or screw jack, is a type of jack that is operated by turning a leadscrew. It is commonly used to lift moderately and heavy weights, such as vehicles; to raise and lower the horizontal stabilizers of aircraft; and as adjustable supports for heavy loads, such as the foundations of houses.
screw jack
¦ noun a vehicle jack worked by a screw device.
ويكيبيديا
Jackscrew
A jackscrew, or screw jack, is a type of jack that is operated by turning a leadscrew. It is commonly used to lift moderately and heavy weights, such as vehicles; to raise and lower the horizontal stabilizers of aircraft; and as adjustable supports for heavy loads, such as the foundations of houses.
أمثلة من مجموعة نصية لـ٪ 1
1. The National Transportation Safety Board found the airline at fault for insufficient lubrication of the jackscrew assembly, which is used to move the horizontal stabilizer, a wing–like structure on the tail that is used to direct the nose up or down.