https://www.openlearning.com/u..../lawsonirwin-sm9q7g/
Hook Locks For Trucks, Vans and Skip-Loaders The Crosby Group has a large selection of hook locks available for trucks, vans, and skip-loaders. We have self-locking clevis hooks to avoid pinching; ball bearing swing hooks that provide better side stability and reduced weight and galvanized hooks that keep out corrosion. A combination of an algorithm for numerical continuation as well as bifurcation theory were used to study the performance of the hook lock mechanism. Nine state variables wer