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New Trailers with Ingenious Suspension
Page 93
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Full Details of the Latest Crane Units, Embodying Short Oscillating Axles with Very Low. Pivots AN interesting suspension system is incorporated in a new type of multi-wheeled trailer which Cranes (Dereham), Ltd., Dereham, Norfolk, has just completed, in response to a demand for trailers built for total laden weights of 16 tons and 19 tons. Two of the smaller class have just been built.
The special feature in the design is the arrangement of the springing and the pivotal mounting for the short rear axles, two of which are placed in line, each carrying a pair of wheels. We understand that the design has been provisionally protected.
In arrangements of this kind, in which the pivoting point is higher than the axle centre, it is possible, with the wheels only 'slightly tilted, for one wheel of either pair to be subjected to nearly the whole of the load carried by the spring above it. This is obviated in the Crane design, because the point of suspension is extremely low.. .Furthermore, the arrangement is of a simple character, in that all shackles, bolts and pins have been entirely eliminated. The spring leaves b.re practically flat, and the two topmost leaves are fitted into cast-steel trunnions which work in p'hosphor-bronzebushed steel brackets mounted below the chassis frame, as shown above.
Because the springs are nearly flat, the amount of movement through deflection is very small. The short axles are above and bolted down to the springs, the axis of each being, therefore, several inches above the fulcrum points of the spring-end pivots.
Lightness has been given close consideration in the design of this new trailer, and with a two-wheeled front axle it is intended for a laden weight of 16 tons. By the employment of a forecarriage having two short axles in line (similar to the rear arrangement), it is possible to provide for a gross laden weight of 19 tons, the chassis weight in that case being 3 tons 3 cwt. One of the principal means for keeping down weight is the use of special hightensile steeL The rear axles have tapered roller bearings for the cast-steel hubs, which incorporate eight-stud wheel fittings. The wheels are of the company's special type, made at the Dereham works, and carry 10.50-in. by 13-in. tyres.
The forecarriage is of the usual Crane turntable type, having steel pressings and a roller bearing at the centre.
One can anticipate the development of a considerable market for such trailers for use in conjunction with motive units like the Latil Traulier. Allowing a pay-load of one or two tons on the motive' unit, a legal pay-load totalling 16 or lft tons might be obtained.