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It consists of metal pieces connected together in a scissor-like shape between a top and a bottom platform. The metal pieces acting as an adjustable lift using the scissors mechanism (or pantograph) in changing its height and also can withstand a wide range of weight. Manual laboratory scissor jack (side view)
The most common lift table design incorporates hydraulic cylinders and an electrically powered pump to actuate the scissor lifting mechanism. Lift tables can also be driven by pneumatic sources, trapezoidal-threaded screw drives, push chains or by hydraulic foot pump when the load is not heavy. The choice of drive mechanism depends on factors ...
This mechanism is used in devices such as lift tables and scissor lifts.Modern low-profile computer keyboards make an extensive use of it as well, installing each key on a scissor support to ensure their smooth vertical movement, allowing the use of a cheap and reliable rubber dome contact set, instead of expensive and complex array of mechanical switches.
Artificial lift is the use of artificial means to increase the flow of liquids, such as crude oil or water, from a production well. Generally this is achieved by the use of a mechanical device inside the well (known as pump or velocity string) or by decreasing the weight of the hydrostatic column by injecting gas into the liquid some distance down the well.
To incorporate the device into a lift system, multiple helical band actuators are arranged below the lift platform where they are powered by an electric motor(s) and synchronized transmission. Helical band actuators require a separate lateral support mechanism, usually provided in the form of guide rails or self-guiding frame, such as a ...
Bin tippers typically have a steel frame, guarding and cradle, with a motor or crank-handle driving a lifting mechanism, which may be hydraulic or chain operated.Bins are placed into the machine, then lifted and inverted over the destination receptacle, allowing the contents to be emptied by gravity.