Fluid circuit means for elevating the rear end of an air ride tr

Details Fluid circuit means for elevating the rear end of an air ride tr Fluid circuit means for elevating the rear end of an air ride tr

1983-09-22

1985-12-17

Bertsch, Richard A.

Land vehicles

Wheeled

Running gear

280 6R, 280702, 280709, B60G 500

Patent

active

045588864

ABSTRACT:
Fluid circuit means to elevate the rear end of a truck trailer are incorporated in the air ride suspension means for the truck trailer and in communication with the air brake or spring brake fluid circuitry. The fluid circuitry provides manually controllable means to elevate the bed of the truck trailer at the rear thereof when the truck trailer is parked.
The fluid circuitry is in communication with the spring brake fluid circuitry to prevent elevation of the truck trailer when the truck trailer parking brakes are not applied. The fluid circuitry provides a manually controllable connection bypassing the leveling valves to raise the truck trailer by admitting additional air under pressure into the air ride bags supporting the trailer. The fluid circuitry connections assure that the elevating system will be released and the excess air in the air ride bags exhausted automatically when the spring brake circuitry is pressurized to release the trailer parking brake. The connection with the spring brake circuitry is a safety feature in the event the operator does not release the manual control for the elevating means prior to releasing the parking brakes on the trailer.

REFERENCES:
patent: 3013809 (1961-12-01), Szostak
patent: 3025077 (1962-03-01), Alfieri
patent: 3044762 (1962-07-01), Stengelin

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