Abstract: A ball joint connects a swinging shaft and a bell-crank provided on a change lever for transmitting a swinging movement of the change lever in a select direction to the bell-crank. The ball joint includes a ball having a pair of flat surfaces for defining a width smaller than the maximum diameter of the ball, a ball hole which is formed at one end of the bell-crank and in which the ball is rotatably fitted, a shaft hole which formed in the ball so as to open through both the flat surface and in which the swinging shaft of the change lever is slidably fitted. A rotation of the ball in the ball hole permits a relative swinging movement between the swinging shaft and the bell-crank. A sliding movement of the swinging shaft in the shaft hole permits an axial displacement of the swinging shaft with respect to the bell-crank.

Abstract: Main and subsidiary levers 24 and 25 forming a change lever are intersected and coupled to each other to form a T-shape. A pair of hemispherical bodies forming a fulcrum member are formed, at their coupled end surfaces, with supporting recesses extended in three directions and fitted to outer peripheral surfaces of the intersected main and subsidiary levers. With this arrangement, it is possible to reliably and easily mount the spherical fulcrum member to the change lever.

Abstract: A cap for supporting a spehrical fulcrum member of a change lever between the cap itself and a hemispherical bottom wall of a housing, and a retainer for pressing the cap through an elastic ring are fitted to the housing. The retainer and the housing are provided at opposed peripheral surfaces of thereof with an engagement claw and an engagement hole, respectively. Therefoere, by only fitting the retainer to the housing, it is possible to easily secure the retainer to the housing.