To prevent the dissociation in the error operation of a spindle lock means by forming a pressure point when a grooved rim is rotated.

A grooved rim 27 is a stopper comprising the entraining action with the triple arranged profiles of a locking travel raceway 67, and comprises the coaxially extended section and notch 674 of the locking travel raceway 67 and a hole 900 for receiving one end of a spring. In the locking travel raceway 67 for forming the pressure point between the grooved rim 27 and a rolling element on the basis of the action of the spring, the arrangement of the upward gradient is excluded. The inexpensive sintered metal is used for the extruded press steel for the grooved rim 27. The grooved rim 27 made of the sintered metal having the upward gradient of the locking travel raceway 67 is exposed to the high pressure of the rolling element, and not sufficient on the basis of the slight impact viscosity. Further the restoring switching force of a clamping flange is increased by a spring of the clamping flange, whereby the face pressure between the grooved rim 27 and the rolling element is kept low.