Antiskid device

In an antiskid device for preventing wheels from skidding, said device being of the type having, sensor and logic means for developing a braking pressure reducing signal when said wheels are in a skid condition, a braking system having a master cylinder and wheel cylinders for applying braking pressure to said wheel cylinders, a modulator for reducing the braking pressure to said wheel cylinders when actuated, the improvement comprising, pressure sensor means responsive to the braking pressure at said wheel cylinders for providing a braking pressure minimum signal when the braking pressure in said wheel cylinders is above a predetermined minimum which is set nearly at zero where the braking pressure will be ineffective, and circuit means responsive to said braking pressure reducing signal and said braking pressure minimum signal for actuating said modulator only when both said signals are in coincidence, said pressure sensor means comprising a pressure switch actuated when said minimum pressure is exceeded, and said circuit means comprising a transistor having base, collector, and emitter electrodes, said base being connected to receive said braking pressure reducing signal, and said collector and emitter forming an output circuit in combination with a control coil for said modulator, said pressure switch being electrically connected in said circuit to prevent actuation of said circuit when said switch is open, wherein said switch is in series with said coil.