https://www.openlearning.com/u..../robleshardy-sm00a5/
Why You Should Install a Hook Lock A hook lock prevents criminals from stealing your van contents by securing it to the door of your vehicle. They also reduce the chance of work-site injuries caused by spring latches that fail on slinghooks that are standard and do not snap shut when not under load. This paper employs numerical continuation and bifurcation theory to analyze the motion characteristics of a type of hook lock mechanism. The influences on the landing gear's weigh