• New Semi-trailer Uses Cary, Laminaire Springs
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DRE'VIOUSLY engaged in the produc tion of light trailers, Boden Trailers, Ltd., Royton, Oldham, have now entered the heavy semi-trailer field with a 12-trio platform model. It incorporates the Cary Laminaire system of progressive leaf' spring suspension. This is thought to bc the first production use of this design.
The main leaf spring which carries the cambered tubular axle bears at its rear end on a short additional leaf spring. Only the tips of the springs touch when the trailer is unladen, but as the load is added they tend to lie flat against each other, shortening the effective length of the main spring and thus stiffening the suspension.
The 12-ton semi-trailer has 12-in.-deep pressed-steel chassis side members, 7-in.deep pressed rave rails, vertical-screw oil. baths landing gear and 151-in.-diameter brake drums with 6-in.-wide facings. Tyres are 9.00-20-in. 12-ply.
A 14-tontier of similar design will follow shortly and a complete range of Semi-trailers with capacities from 10-20 tons is planned.