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  2. Jack post - Wikipedia

    en.wikipedia.org/wiki/Jack_post

    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.

  3. Jackscrew - Wikipedia

    en.wikipedia.org/wiki/Jackscrew

    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. [citation needed]

  4. 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 ...

  5. Pumpjack - Wikipedia

    en.wikipedia.org/wiki/Pumpjack

    The cranks themselves also produce counterbalance due to their weight, so on pumpjacks that do not carry very heavy loads, the weight of the cranks themselves may be enough to balance the well load. Oilfield pumpjack in Hockley County, Texas. Sometimes, however, crank-balanced units can become prohibitively heavy due to the need for counterweights.

  6. Strand jack - Wikipedia

    en.wikipedia.org/wiki/Strand_jack

    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]

  7. Post (structural) - Wikipedia

    en.wikipedia.org/wiki/Post_(structural)

    Ridge – A post extending from the ground or foundation to the ridge beam. Samson – similar to a prick post or puncheon. Puncheon: 1) A short, stout post may be identical to a prick post; 2) Puncheon may also mean a split log or heavy slab of timber with the face smoothed, used for flooring or construction.

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