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2. Jack (device) - Wikipedia

   en.wikipedia.org/wiki/Jack_(device)

   Jack (device) 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] The most common form is a car jack, floor jack or garage jack, which lifts vehicles so that ...

3. Jackscrew - Wikipedia

   en.wikipedia.org/wiki/Jackscrew

   Jackscrew. A 2.5-ton screw jack. The jack is inserting the bar (visible lower left) in the holes at the top and turning. 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 ...

4. Lift slab construction - Wikipedia

   en.wikipedia.org/wiki/Lift_slab_construction

   Lift slab construction. Lift slab construction (also called the Youtz-Slick Method) is a method of constructing concrete buildings by casting the floor or roof slab on top of the previous slab and then raising (jacking) the slab up with hydraulic jacks. This method of construction allows for a large portion of the work to be completed at ground ...

5. Blackhawk (tools) - Wikipedia

   en.wikipedia.org/wiki/Blackhawk_(tools)

   Blackhawk Manufacturing was founded in 1919 in Milwaukee, Wisconsin as a subsidiary of the American Grinder Company (later named Applied Power Corporation). It made automotive tools, such as wrenches and sockets, [1] and a number of specialty tools. [2] Blackhawk introduced a number of innovations to conventional drive tools, such as the "Lock-On" system of locking sockets, [3] gearless ...

6. Strand jack - Wikipedia

   en.wikipedia.org/wiki/Strand_jack

   A strand jack is a hollow hydraulic cylinder with a set of steel cables (the "strands") passing through the open centre, each one passing through two clamps - one mounted to either end of the cylinder. The jack operates in the manner of a caterpillar 's walk: climbing (or descending) along the strands by releasing the clamp at one end, expanding the cylinder, clamping there, releasing the ...

7. Raising of Chicago - Wikipedia

   en.wikipedia.org/wiki/Raising_of_Chicago

   Raising of Chicago. During the 1850s and 1860s, engineers carried out a piecemeal raising of the grade of central Chicago to lift the city out of its low-lying swampy ground. Buildings and sidewalks were physically raised on jackscrews. The work was funded by private property owners and public funds.