Safety interlock circuit for switching brake antilock systems in

Details Safety interlock circuit for switching brake antilock systems in Safety interlock circuit for switching brake antilock systems in

1974-09-23

1976-01-27

Blix, Trygve M.

Fluid-pressure and analogous brake systems

Inertia control

180 82R, 180103, 303 7, 303 20, 317 9C, 340248B, 340253B, B60T 802, B60T 1300

Patent

active

039349403

ABSTRACT:
In the tractor vehicle a current measuring resistor is interposed in the line supplying current to a coupling connector terminal to which the antilock system of a trailer equipped with such a system is connected for its power supply. A resistor load is connected to this power supply line through a switch that is closed when no trailer is coupled but is held open when a trailer is coupled. The current through the current measuring resistor either flowing through the resistor load or through a normally functioning antilock system of a trailer causes operation of a threshold switch to energize the brake antilock system of the tractor vehicle. A relay controlled by a starting circuit controls the application of the supply voltage to the trailer brake antilock system which is arranged to be tripped by a malfunction of the antilock system that may occur after a brief starting period, in which case the reduction of current in the supply line also results in putting the antilock system of the tractor out of operation. Thereafter, the antilock systems cannot be put into operation again until the voltage supply to the trailer is interrupted and reapplied to restart the antilock system of the trailer.

REFERENCES:
patent: 2324424 (1943-07-01), Pollack
patent: 3544172 (1970-12-01), Howard et al.
patent: 3620577 (1971-11-01), Neisch et al.
patent: 3822920 (1974-07-01), Bernhardt et al.
patent: 3843207 (1974-10-01), Syria

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