System for preventing a trailer's overrun brakes from being activated during reversing
AssigneeSvela Solutions AS
InventorSverre Egil LARSEN
Life of this patent
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Abstract
A overrun brake system includes a gas spring with a gas-tight cylinder and a piston with holes allowing gas to slip through so that the pressure is the same on both sides. Since the free end of the piston has a larger area than the side where the piston rod is located, the gas spring will act as a compression spring. To prevent the overrun brakes from being activated during reversing, the gas spring has a solenoid controlled valve receiving current from the reverse light circuit and closing the flow of gas through the piston when the towing unit's gear is set into reverse. When the gear is set into forward position the solenoid loses its current and a mechanical return spring opens the valve, so that the overrun brakes may act normally again.
Claims7
An overrun brake system for a trailer, the system comprising:
- a coupling device adapted to connect the trailer to the towbar of a vehicle,
- a slide connecting the coupling device to the drawbar of the trailer and transferring retardation forces to the brakes of the trailer,
- a gas spring connected in parallel with the slide, the gas spring including a cylinder and piston, and
- a solenoid valve connecting the two sides of the piston, the solenoid valve being electrically connected to and operated by the vehicle's reverse light circuit or another electric source, the solenoid valve being open when non-energized connecting the two sides of the piston, and the solenoid valve closing preventing gas passing between the two sides of the piston when energized by the reverse light system, or the other electric source.
Dependencies are inferred from the claim text.