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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]
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.
Lift tables can be mounted in a pit for floor-level loading, especially useful for access by manual pallet-pump trucks and the mobility impaired or wheelchair users. Industries that commonly use lift tables include woodworking, upholstered furniture manufacturing, metalworking, paper, printing and publishing, warehousing and distribution, heavy ...
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 ...
A hand crank machine fit in a small case, making it a piece of luggage rather than a piece of furniture. It also cost significantly less than a full treadle. Indeed, the 3/4th size model 28/128 derivative was specifically intended for this end. The crank is geared to give a negative mechanical advantage so that it can crank the machine at high ...
Lifting equipment, also known as lifting gear, is a general term for any equipment that can be used to lift and lower loads. [1] Types of lifting equipment include heavy machinery such as the patient lift , overhead cranes , forklifts , jacks , building cradles, and passenger lifts, and can also include smaller accessories such as chains ...
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