Centrifugal clutch with an expanding effect

Claim 1

IN A CENTRIFUGAL CLUTCH, A ROTATABLE CAMMING MEMBER OF GENERALLY POLYGONAL SHAPE, A PLURALITY OF CLUTCHING MEMBERS, THE NUMBER OF SIDES OF THE CAMMING MEMBER CORRESPONDING TO THE NUMBER OF CLUTCHING MEMBERS, A ROTATABLY JOURNALLED DRUM CONSTITUTING A MEMBER TO BE CLUTCHED AND HAVING AN INNER SURFACE SURROUNDING SAID CAMMING MEMBER AND CLUTCHING MEMBERS, SAID CLUTCHING MEMBERS BEING MOVABLE TOWARD AND AWAY FROM SAID INNER SURFACE OF THE DRUM AND EACH CLUTCHING MEMBER HAVING AN INNER AND AN OUTER SURFACE, MEANS BIASING SAID CLUTCHING MEMBERS FOR MOVEMENT TOWARD THE AXES OF SAID CAMMING MEMBERS, SAID INNER SURFACES OF THE CLUTCHING MEMBERS WHEN IN THEIR INNERMOST POSITION DEFINING A SPACE SURROUNDING SAID CAMMING MEMBER AND GENERALLY CORRESPONDING IN SHAPE WITH THE CROSS-SECTION OF THE CAM, THE OUTER SURFACES OF THE CLUTCHING MEMBERS BEING SPACED INWARD FROM THE INNER SURFACE OF THE DRUM IN DISENGAGED POSITION, SAID POLYGONAL CAMMING MEMBER HAVING ARCUATE CORNERS HAVING RESPECTIVE RADII SUCH AS CAN OBTAIN SUCCESSFUL EXPANDING EFFECT ESPONSIVE TO ROTATION OF THE CAMMING MEMBER TO ENGAGE THE OUTER SURFACES OF THE CLUTCHING MMEBERS WITH THE INNER SURFACE OF THE DRUM, A COMPRESSED PLATE SPRING MEMBER DISPOSED BETWEEN THE OUTER PERIPHERY O THE CAMMING MEMBER AND THE INNER SURFACES OF THE CLUTCHING MEMBER AND SAID SPRING MEMBER HAVING A LENGTH TO AT LEAST PARTLY SURROUND SAID CAMMING MEMBER SO AS TO PREVENT RATTLING OF THE CLUTCH AT SLOW ROTARY SPEEDS.