Arcade claw machines already feature battle-tested mechanics for raising and lowering something on a string. They do not simply deploy a wound bobbin, but inst

Arcade claw machines already feature battle-tested mechanics for raising and lowering something on a string. They do not simply deploy a wound bobbin, but instead have the bobbin after 2 idler wheels. One wheel is housed on a lever - The weight of the claw (or in this case package) keeps the idler on a lever pushed down during most of the operation - when it contacts a prize (or in this case the floor) the idler receives less load and thus the lever moves up ensuring it does not jam or unwind further. Its a pretty ingenious design from an age where load sensing would be very expensive - and achieves robust bi-directional winding with end detection with just 1 microswitch. This zero-moving parts hook sounds great, but I don't see how much different it can be from a gravity hook, or a ships buoy-hook; unless it simply captures the package interface in a specific orientation (anyone who has ever played "fishing" with 2L pop bottles and a curtain ring knows the satisfaction of such mechanisms) - my guess would be that the attachment point is a specific shape rather than a circle; to promote the tension-less force to movement up and off.