The electrical brake coils of a trailer are energized when the stoplight switch of the towing vehicle is closed and the trailer surges forwardly with respect to the towing vehicle to cause the wiper of a rheostat to move relatively along the resistor of the rheostat. A hazard switch for ...
United States Patent US3754623 Note: If you have problems viewing the PDF, please make sure you have the latest version ofAdobe Acrobat. Back to full text
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The electrical brake coils of a trailer are energized when the stoplight switch of the towing vehicle is closed and the trailer surges forwardly with respect to the towing vehicle to cause the wiper of a rheostat to move relatively along the resistor of the rheostat. A hazard switch for ...