This reminds of old factories that had belt-driven tools running off of a shared axle hanging overhead. The axle would be powered by a combustion motor. Turning

This reminds of old factories that had belt-driven tools running off of a shared axle hanging overhead. The axle would be powered by a combustion motor. Turning on/off your tool meant engaging or disengaging it’s belt from the axle. I’ve only seen these in museums and don’t remember what they’re called.