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A jackscrew, or screw jack, is a type of jack that is operated by turning a leadscrew. It is commonly used to lift moderate 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.
A jack which can lift a mobile home. A jack is a mechanical lifting device used to apply great forces or lift heavy loads. A mechanical jack employs a screw thread for lifting heavy equipment. A hydraulic jack uses hydraulic power. [1]
House raising (also called house lifting, house jacking, barn jacking, building jacking) is the process of separating a building from its foundation and temporarily raising it with hydraulic screw jacks. The process is the first step in structure relocation in which the building is moved to a different location. [1]
This property is also the basis for the use of screws in screw top container lids, vises, C-clamps, and screw jacks. A heavy object can be raised by turning the jack shaft, but when the shaft is released it will stay at whatever height it is raised to. A screw will be self-locking if and only if its efficiency is below 50%.
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Blackhawk also produced Blackhawk Jack brand floor jacks under the Blackhawk Mfg. Co. name including a handy 1-1/2 Ton heavy steel wheeled model. [10] In the early 1950s, the Blackhawk hand tool line was acquired by the New Britain Machine Company. In the 1970s, Litton Industries purchased New Britain. In the 1980s, National Hand Tool acquired ...
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A jack post (telepost, adjustable steel column) is a steel post used in the construction trades for temporary support of ceilings, walls and trenches . They are designed to be able to mechanically telescope to about twice their shortest length in order to span a wide variety of spaces.
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