Title: Antiskid device for air brakes

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Claims: I claim:

1. In an antiskid device for air brakes comprising a modulator mounted in a pressuried air line connecting a brake valve to brake actuators, and a signal producing means adapted to produce a pressure reducing electric signal when the braking pressure of each of said brake actuators has reached a pressure increase target value which pressure reducing electric signal is applied to said modulator to actuate the same so as to reduce the braking pressure applied by each said brake actuator to maintain the slip rate at an optimum value of 0.2 or thereabout by changing the speed of wheels, the improvements wherein said modulator comprises:

a. a first valve capable of moving between an open position in which it allows pressurized air from said brake valve to pass freely therethrough and a throttling position in which it allows the pressurized air to pass therethrough in a reduced quantity;

b. a second valve connected in series with said first valve and capable of moving between an open position in which it allows the pressurized air from said first valve to pass freely therethrough and a discharge position in which it permits pressurized air from the brake actuators to be discharged therethrough;

c. a first air operating means for operating said first valve; and

d. a second air operating means for operating said second valve;

said signal producing means first producing a throttling electric signal for actuating said first air operating means and moving said first valve to its throttling position before the braking pressure of the brake actuators reaches the pressure increase target value, and then producing the pressure reducing electric signal for actuating said second air operating means and moving said second valve to its discharge position when the braking pressure has reached the pressure increase target value, whereby an increase in the braking pressure of the brake actuators can be reduced in speed about the time the braking pressure reaches the pressure increase target value so as to thereby avoid an excessive rise of the braking pressure above the pressure increase target value which would otherwise occur due to a time lag of the initiation of a reduction in the braking pressure of the brake actuators behind the production of a pressure reducing electric signal, and the time lag can be reduced by utilizing the force of air for actuating said first valve and said second valve.

Other info:

Inventors: Sekiguchi, Yukichi (Yono, JA)

Application Number: 624706
Filing Date: 1975-10-22
Publication_date: 1976-08-24
Assignee: Sanwa Seiki Mfg. Co. (JA)
Primary Class(es): 303/118.1 303/61
Other Classes:
US Patent Ref:

3731980	May, 1973	Fink et al.	303/21.
3749125	Jul, 1973	Peruglia et al.	303/21.
3913983	Oct, 1975	Sekiguchi	303/21.

Other Refs:
Primary Examiner: Reger, Duane A.
Assistant Examiner:
Attorney: Chaskin; Jay L.