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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 performed. Jacks are usually rated ...
size 2 from 6.5 feet (2.0 m) to 11 feet (3.4 m), size 3 from 8 feet (2.4 m) to 13 feet (4.0 m), size 4 from 10.5 feet (3.2 m) to 16 feet (4.9 m). The safe load for each prop depends upon the size and extension of the prop. Size 1, 2 and 3 props can take about 34 kN unextended, dropping progressively to less than half of that when fully extended.
An example of a simple scissor lift A pantograph mirror. A scissors mechanism uses linked, folding supports in a criss-cross 'X' pattern. [1]The scissor mechanism is a mechanical linkage system used to create vertical motion or extension.
A gin pole derrick (also known as standing derrick or pole derrick) is a derrick without a boom and with single tower or mast supported by four guy wires (two side guys, a fore guy and a rear guy). Its guys are so arranged from its top as to permit leaning the mast in any direction.
Strandjack at Freybridge in Berlin–Spandau 52° 30′ 42,11″ N, 13° 12′ 11,7″ O. A strand jack (also known as strandjack) is a jack used to lift very heavy loads (e.g. thousands of tons or more with multiple jacks) for construction and engineering purposes. [1]
Replacing an advertising poster in London using an aerial work platform. An aerial work platform (AWP), also an aerial device, aerial lift, boom lift, bucket truck, cherry picker, elevating work platform (EWP), mobile elevating work platform (MEWP), or scissor lift, is a mechanical device used to provide temporary access for people or equipment to inaccessible areas, usually at height.