Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1988-10-24
1990-10-16
Olszewski, Robert P.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 10, 303 61, 303DIG4, B60T 802
Patent
active
049629727
ABSTRACT:
An automatic wheel lock-up control apparatus alternately and cyclically applies brake-pedal controlled pressure to the primary and secondary brake lines driving the slave cylinders of a vehicle's wheel brakes when the brake-pedal pressure exceeds a predetermined value. The apparatus includes an elongated cylindrical body having identical halves, one containing a primary valve for removing or applying primary master cylinder pressure to the primary brakes, and the other containing an identical secondary valve for removing or applying secondary master cylinder pressure to the secondary brakes. An eccentric rotated by an electric motor reciprocally drives a pushrod longitudinally within the body of the apparatus to operate the primary and secondary valves in an alternate, push-pull fashion. The motor is energized by a battery connected in series with a separate pressure switch on the inlet sides of both primary and secondary valves, initiating operation of the apparatus when the pressure in either master cylinder inlet exceeds a predetermined threshold.
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patent: 4033637 (1977-07-01), Leiber
patent: 4109970 (1978-08-01), Ashby, Jr.
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patent: 4568131 (1986-02-01), Blomberg et al.
patent: 4715665 (1987-12-01), Ostwald
patent: 4730879 (1988-03-01), Adachi et al.
patent: 4755007 (1988-07-01), Mollat
Chapin William L.
Graham Matthew C.
Olszewski Robert P.
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