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According to F. Lisheng and T. Qingjun, the hand-crank of the rotary quern was different from a crank, which was the combination of a hand-crank and a push-and-pull connecting rod by a hinge. [7] The Antikythera mechanism, dated to around 200 BC, [25] [26] used a crank as a part of its mechanism. [27]
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 such as load capacity, lifting height, speed requirements, and the intended environment. Lift tables can be mounted in a pit for floor-level ...
It was originally sold as a treadle with cabinet or as a hand-crank with carrying case. Later, add-on electric motors with foot or knee control were available pre-installed or as a field upgrade. Typical cost for this machine as a treadle with a cabinet was US$65 in 1909, [ 2 ] which is about US$1532 adjusted.
The use of bin tippers and other lifting aids has been stimulated in recent years by research linking heavy manual lifting with musculoskeletal disorders; [9] [10] some government organisations, [11] schools [12] and companies now prohibit emptying bins by hand. Health and safety concerns have also driven the adoption of bin tippers in the ...
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.
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