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When folded, the lift will typically fit inside a cupboard under the countertop, and when expanded the top of the shelf will usually be level with the countertop and cause the cupboard door having to be left open. The lifting mechanism is often spring-assisted [2] so that the user does not have to lift the entire weight of the kitchen appliance ...
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.
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 ...
Later coffee tables were designed as low tables, and this idea may have come from the Ottoman Empire, based on the tables in use in tea gardens. As the Anglo-Japanese style was popular in Britain throughout the 1870s and 1880s, [ 5 ] and low tables were common in Japan , this seems to be an equally likely source for the concept of a long low table.
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)
An actuator can be just a mechanism that is directly driven by the motions or forces of other parts of the system. An example is the camshafts that drive the intake and exhaust valves in internal combustion engines, driven by the engine itself. Another example is the mechanism that strikes the hours in a traditional grandfather clock or cuckoo ...