(under subclass 10.1) Devices having a rotatable stop element for halting shaft movement and a movable abutment for the stop element, and means for moving the abutment into a position in which the stop element may contact the abutment.
(1) Note. Electric motor control of the rotatable stop elements and/or the movable abutments will be found in Class 192, Clutches and Power-Stop Control, subclasses 138+, and particularly subclass 142; and the appropriate subclass of Class 318, Electricity: Motive Power Systems, subclasses 560+, for position servo control systems particularly subclass 614, friction braking at balance; see (2) Note to this class (74), subclass 10.
SEE OR SEARCH CLASS
192, Clutches and Power-Stop Control,
138+, for power-stop limit controls and see (1) Note.
318, Electricity: Motive Power Systems, appropriate subclasses for electric motor control, and particularly 560+, for position servo control type particularly subclass 614, for friction braking at balance; and see (1) Note.