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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]
Crank slider mechanisms with 0 and 1.25 eccentricity. A slider-crank linkage is a four-bar linkage with three revolute joints and one prismatic, or sliding, joint. The rotation of the crank drives the linear movement the slider, or the expansion of gases against a sliding piston in a cylinder can drive the rotation of the crank.
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Slider crank mechanisms of a steam engine with a crosshead linking the piston and the crank. Crank slider mechanisms with 0 and 1.25 eccentricity. Coupler curves of a slider crank. A slider-crank linkage is a four-link mechanism with three revolute joints and one prismatic (sliding) joint. [1]
Movie projector with hand crank and Geneva drive. One application of the Geneva drive is in film movie projectors and movie cameras, where the film is pulled through an exposure gate with periodic starts and stops. The film advances frame by frame, each frame standing still in front of the lens for a portion of the frame cycle (typically at a ...
The quick return mechanism was modeled after the crank and slider (arm), and this is present in its appearance and function; however, the crank is usually hand powered and the arm has the same rate throughout an entire revolution, whereas the arm of a quick return mechanism returns at a faster rate.
Hand-powered force pump, with an air chamber to smooth out variations in flow rate. Hand pumps are manually operated pumps; they use human power and mechanical advantage to move fluids or air from one place to another. They are widely used in every country in the world for a variety of industrial, marine, irrigation and leisure activities.
This is a vertical spool with a ratchet mechanism similar to a conventional winch, but with no crank handle or other form of drive. [7] The line is wrapped around the spool and can be tightened or reeled in by pulling the tail line. The winch takes the load once the pull is stopped with little operator tension needed to hold it.