Two stage process model of learning from multimedia: guidelines for design

An over center load binder assembly is disclosed comprising a crank member, a clevis type draw bar with leg elements pivotally connected to a first portion of the crank member, a pull link pivotally connected to a second portion of the crank member and a lever handle, pivotally connected to the crank member and comprising a cam surface, radial to the axis of the lever handle pivotal connection, having a maximum lobe swell sufficient to displace the pull link from an alignment between the leg portions of the clevis type draw bar to release the assembly from tension.