Adjusting collar for single revolution spring clutch

Claim 1

A spring clutch of the type adapted to be stopped at a particular angle position comprising: a. an output hub including a drum portion, b. an input hub adapted to being continuously driven in one direction, and rotatably mounted on said output hub, with a drum portion adjacent to and coaxially aligned with said output hub drum portion, c. a helical spring on said adjacent drum portions and having an interference fit with respect thereto, said spring including a tang at one end, said one end of said spring being associated with said driven input hub drum portion, d. a split collar and clamping screw for clamping several turns at the opposite end of said spring to said output hub drum portion, said screw serving to clamp said split collar onto said spring, said split collar defining a radially outwardly open slot for said pin and slot connection, e. a release collar loosely received on said spring and having a recess for receiving said tang to cause said collar to rotate with said spring, said release collar having a projecting lug for engagement with a non-rotating member external to the clutch for disengaging said spring clutch, and wherein said release collar carries a pin projecting axially into said split collar slot and adapted to abut one radially extending side of said split collar slot when said lug is stopped by a nonrotating member or the like, said split collar thereby serving as an adjusting collar for said spring and said release collar to allow the angular orientation of the stopped output hub to be preadjusted and also to allow preadjustment of the overtravel gap defined between said pin and said one side of said slot.