(under subclass 101) Subject matter including structure mechanically linked with the means for varying the engagement pressure of the contact surfaces, and peculiarly adapted for operation by the foot or knee, as by being operable by a push, and including structure such as a spring for returning to the initial position upon removal of the pushing force, and including a portion shaped to facilitate engagement with the foot as by being shaped like the sole of the foot or having a substantially flat foot engaging surface.
SEE OR SEARCH THIS CLASS, SUBCLASS:
153, for resistors having a contact movable along an elongated resistor, and operated by a pedal or treadle.
215, for a fixed resistor and switch combination which may be operated by a pedal or treadle.
SEE OR SEARCH CLASS
74, Machine Element or Mechanism,
512+, for foot operated linkage systems; subclass 515 for knee operated linkage systems; and subclasses 560+ for pedal type levers.
