My favorite; the reverse achieved by turning over handle, but no pawl and ratchet. They had lobed (really more like a chord, but a shallow inclined step) cam inside a round hard bushing, the space taken up with a dowel pin. Smallest possible angular increments of reset and capable of delivering serious torque, no teeth to strip. No matter how far swung back, it re-engaged almost immediately.

Cue Marv, he'll know the name. I always thought they'd be a terrific addition for a shift mechanism, far more dependable than spring and ball or plunger detent.