Quasi-static models of a four-bar quick-release hook. Bruzzone, L, Berselli, G, Bilancia, P, & Fanghella, P International Journal of Mechanics and Control, 18(2):25–32, 2017.
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Quick-Release Hooks (QRHs) are connection devioes for cbains or metal ropes, which can be unfastened under full-load conditions by using a limited opening foroe. Despite their widespread use, tbe scientific literature about the mechanical behaviour of QRHs is ra1her limited. 1bis paper deals with the kinematic and quasi-static analysis of a cws of QRHs, basecl on a spring-loaded four-bar mechanism operating in tbe proximity of a singularity configuration. The quasi-stati.e aoalysis allows to estimate the opening farce as a function of the mechanism geometry and ofthe safety spring's features. At last, a multibody model ofthe system is developed, in order to validate the analytical model and to evaluate the influence of friction in revolute joints.

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