New Dyson Air Suspension
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AN air-suspension layout for single-axle semi-trailers is now being produced by R. A. Dyson and Co, Ltd., Grafton Street, Liverpool. They can now offer air springing for singleand tandem-axle semi-trailers and four-wheeled trailers. The new design employs two trailing arms joined at their rear ends by a cross-member with the axle mounted in the middle. At the outer ends of the cross-member, two Dunlop threeconvolution air springs abut at ,the top on the lower flanges of the chassis frame. The springs are in line with the wheels, giving a wide spring-base. Dunlop delay-type levelling valves and twin hydraulic shock absorbers are employed.
To allow for movement on one wheel relative to the other, the trailing arms, which are rigidly attached to the axle, are of top-hat section. This permits them to twist during such movements. A Panhard rod locates the axle laterally.
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