Demand driven clutch

A demand driven clutch assembly comprising:

• a pulley member including an outer rim, an inner sleeve positioned in spaced relation within the outer sleeve and a plurality of yieldable resilient vanes which normally maintain said rim and sleeve in concentric relation but are yieldable to external force to permit said rim to shift radially inwardly,
• said inner sleeve being adapted to be journaled for free rotation on a rotary drive shaft, and
• said outer rim extending axially outwardly beyond said inner sleeve to provide an inner friction clutch driving surface,
• a pair of driving members including:
• a driving collar adapted to be fixed to the drive shaft in axially spaced relation to said inner sleeve,
• a driving hub clutch element interposed between said collar and said inner sleeve and having a central axial opening to receive shaft, and
• a plurality of connecting elements extending between said collar and said hub in parallel relation to the axis of said central opening to provide a driving connection between said hub and said collar,
• the outer circumferential surface of said hub providing a friction driving clutch surface for driving engagement within the inner clutch surface of said rim when said rim is shifted radially inwardly by an external force applied to the outside thereof.