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  2. Jackscrew - Wikipedia

    en.wikipedia.org/wiki/Jackscrew

    A machinist's jack is a miniature screw jack used to support protruding parts of a workpiece or to balance clamping forces on that workpiece during machining operations. Aside from their size, these frequently look no different from the screw jacks used to lift buildings off their foundations.

  3. Jack (device) - Wikipedia

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

    Jackscrews are integral to the scissor jack, one of the simplest kinds of car jack still used. A scissor jack use the mechanical advantage of a leadscrew and 4-bar linkage to allow a human to lift a vehicle by manual force alone. They are inexpensive and are common in manufacturer-supplied breakdown kits. The jack shown at the left is made for ...

  4. Scissors mechanism - Wikipedia

    en.wikipedia.org/wiki/Scissors_mechanism

    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. It consists of a series of interconnected, folding supports that resemble the shape of a pair of scissors, hence its name.

  5. Laboratory scissor jack - Wikipedia

    en.wikipedia.org/wiki/Laboratory_scissor_jack

    Manual laboratory scissor jack, or laboratory lifting platform for other laboratory equipments. Laboratory scissor jacks are lifting stages for beakers, flasks, water baths, stirrer, or other lab tools used to elevate equipment height to the user's needs, usually around 5 to 20 cm. It consists of metal pieces connected together in a scissor ...

  6. Screw mechanism - Wikipedia

    en.wikipedia.org/wiki/Screw_mechanism

    A screw jack. When a bar is inserted in the holes at top and turned it can raise a load When a bar is inserted in the holes at top and turned it can raise a load The mechanical advantage MA of a screw is defined as the ratio of axial output force F out applied by the shaft on a load to the rotational force F in applied to the rim of the shaft ...

  7. Hydraulic rescue tool - Wikipedia

    en.wikipedia.org/wiki/Hydraulic_rescue_tool

    A hydraulic spreader in use, seen here widening a window on the door of a Volkswagen Golf Mk2 to allow fire crews access into the vehicle. The Hurst Rescue Tool was invented by George Hurst, circa 1961, after he viewed a stock car race accident in which it took workers over an hour to remove an injured driver from his car.

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