I'm looking for a solution to selectively engage and disengage a drive shaft with a number of output pulleys, one-at-a-time, like a clutch. Speed would be around 1000 RPM, and torque less than 20 inch-lbs (about 2 Nm). Clutching must happen when unpowered.
My first thought is to emulate how a manual transmission gear selection works (with a dog clutch and a yoke), but a quick google search doesn't turn up any packaged solutions that do this, which leads me to believe it may not be a popular solution to a common problem for a good reason.
How are these sorts of things usually done in mechanical systems? If you have one source of power and multiple powered devices which may be on or off, how are they engaged?