are not intended to limit the scope applicability or configuration of the invention in any way rather the following description provides a convenient illustration for implementing exemplary embodiments of the invention various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims a clutch that has a high engaging force and smooth engagement is illustrated in fig1 6 the clutch comprises a base plate assembly 10 that rotatably carries a plurality of clutch weights 20 and a tension spring based return element 30 is connected between adjacent clutch weights 20 see fig6 the base plate assembly 10 comprises a main driving plate 11 and an associated driven plate 12 wherein the main driving plate 11 is provided with a plurality of constraint sections 13 corresponding to the clutch weights 20 respectively and extending through the associated driven plate 12 and the main driving plate 11 is allowed to drive the associated driven plate 12 in an angularly offsetting manner the associated driven plate 12 is provided with pivot pins 14 pivoting the clutch weights 20 respectively each clutch weight 20 has an inside surface which forms at a location corresponding to the respective constraint section 13 an engaging slot 21 that has an inner abutting face 210 for engaging the constraint section 13 as shown in fig5 and 6 as shown in fig5 8 when the installed clutch is rotated and the speed is gradually increased to a certain speed then the constraint section 13 of each clutch weight 20 will proceed displacement to.