Kitchen mixer having means to instantaneously increase speed when desired

In a kitchen mixer having a motor with a speed control including a drive shaft having a collar mounted for longitudinal movement with respect thereto and centrifugally operated structure on the shaft adjacent the collar and adapted to move the collar away from the structure as the speed of the motor increases, a contact blade with a first contact disposed adjacent the shaft and adapted to be moved by the collar, mounting means disposed adjacent the shaft and having a cam follower to be shifted longitudinally of the shaft and having a second contact aligned with the first contact, disc cam means adjacent the mounting means and adapted to be rotated and shifted longitudinally of its axis, the cam means having a first level with a generally snail-shell-like contour and being outwardly stepped beyond the first level to present a second level having a similar but larger snail-shell-like contour, and electric circuit means connecting the contacts and the motor in series, whereby the rotary position of the cam will control the speed of the motor and a shift of the cam on its axis alters the position of mounting means as the follower rides up on the step to increase the speed over the set speed normally resulting at the given rotary position of the cam.