DRIVE ARRANGEMENT FOR SETTING MECHANICAL APPARATUS, ESPECIALLY THERMOSTATS

摘要

DRIVE ARRANGEMENT FOR SETTING MECHANICAL APPARATUS, ESPECIALLY THERMOSTATS The specification discloses a drive arrangement for a thermostat or the like. The drive arrangement includes a shaft located in a bearing in a housing in such a way that one end of the shaft extends out of the housing and is fitted with a knob or the like for twisting the shaft in the bearing. The other end of the shaft has a collar extending through a disc-like cam. The cam receives the collar through a bore having a slot extending radially therefrom. The protruding end of the collar is expanded by a punch or the like and, since the material of the cam is harder than that of the shaft, the slot in the cam acts as a die and cuts out a tab from the shaft material, which extends into the slot and securely fixes the cam to the shaft. In this way the shaft and cam can be simply and securely fixed together in a very economical manner so that torsional slipping therebetween can be avoided.