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ELECTRONIC TRAILER BRAKE ACTUATOR

  • US 3,738,710 A
  • Filed: 02/25/1971
  • Issued: 06/12/1973
  • Est. Priority Date: 02/25/1971
  • Status: Expired due to Term
First Claim
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1. A braking system for a tractor-trailer unit, said system comprising, in combination:

  • A. a brake light circuit carried by the tractor, said circuit including a battery and a brake light and a brake light switch connected in series between first and second output terminals of said battery;

    B. electrical trailer brakes having a first input terminal and a second input terminal electrically connected to said second battery output terminal;

    C. a timing circuit connected across said first and second battery output terminals upon closure of said brake light switch for deriving a control signal proportional to the duration of brake light switch closure;

    D. electronic amplifier means connected to said timing circuit for selectively amplifying said control signal; and

    E. electronic control means connected between said first battery output terminal and said first trailer brake input terminal and responsive to said amplified control signal for regulating current flow to said trailer brakes in accordance with the duration of brake light switch closure.

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