The Winch

Combining a

with a

and a

creates a winch. The winch can be connected to a hinged block using a sturdy chain. The block must be solid.
Supplying the winch with sufficient charge and a redstone signal will reel in the chain.
A comparator will measure how much chain has been let out.
Charge is conducted through the chain, so various contraptions can be powered while on a hinge.

Workbench.name

Chain

Workbench.name

Short Length of Chain

Workbench.name

Dark Iron Chain Link