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2. Jack (device) - Wikipedia

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

   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] The most common form is a car jack, floor jack or garage jack, which lifts vehicles so that maintenance can be ...

3. Lift slab construction - Wikipedia

   en.wikipedia.org/wiki/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 level, negating the ...

4. Jackscrew - Wikipedia

   en.wikipedia.org/wiki/Jackscrew

   After World War II, improvements to the grinding of hydraulic rams and the use of O ring seals reduced the price of low-cost hydraulic jacks and they became widespread for use with domestic cars. Screw jacks still remain for minimal-cost applications, such as the little-used tyre-changing jacks supplied with cars, or where their self-locking ...

5. Car jack - Wikipedia

   en.wikipedia.org/wiki/Car_jack

   Car jack may refer to: Jack (device), a device for lifting (jacking up) cars and other heavy objects; Carjacking, the crime of forcedly repossessing an occupied car;

6. Steeplejack - Wikipedia

   en.wikipedia.org/wiki/Steeplejack

   Steeplejacks erect ladders on church spires, industrial chimneys, cooling towers, bell towers, clock towers, or any other high structure.In the UK, steeplejacks now use a belay rope fall-arrest system (similar to the method used by rock climbers) attached to the ladders as they are erected to eliminate solo climbing and greatly reduce the risk of falls from height.

7. Jack arch - Wikipedia

   en.wikipedia.org/wiki/Jack_arch

   A jack arch is a structural element in masonry construction that provides support at openings in the masonry. Alternate names are lintel arch , [ 1 ] flat arch and straight arch . Unlike regular arches , jack arches are not curved in form.