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• TRANSPORT by TRAILERS
Page 124
Page 125
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and Its Advantages
DROBABLY one of the earliest applications of the wheel was to some form of trailer. Man discovered at a very early date in history that he could push or pull on a wheeled machine loads which were far too heavy for him to carry unaided. Similarly, one horse could pull far moierthan it could carry on its back. In due time the principle was extended to mechanical traction, the heaviest burdens being borne upon trailers drawn by separate motive units. , As commercial vehicles became more reliable it was found that they could pull loads of approximately the same size as those borne directly by them, without adding to the operating costs in anything like direct proportion, to the gain in pay-load.
To-day the use of trailers for goods-haulage work is rapidly advancing and new designs are brought forward almost weekly to increase the scope of their utility. Under the existing scale of taxation the additional duty on any commercial vehicle licensed for towing a trailer is £6, thus the extra load that can be carried is Subject to little overhead charge on this score, compared with the burden on the motive vehicle.
In the case of tractors used with trailers there is the great advantage that the loading of one trailer can proceed while another is on the road, thus reducing the incidence of terminal delays to the minimum. By reason of the absence of propelling mechanism the frame level of-,a trailer can be made to suit the burden to a remarkable extent and the loading problem can be simplified in many ways, whilst tipping bodies are easily arranged for the rapid discharge of the, burden. To amplify the foregoing remarks we may well deal with certain of the outstanding features of some of the well-known makes of trailer now on the market. In the Bauly range all models are four-wheelers, the maximum loads being 3 tons, 5 tons or 6 tons. • Carrimore trailers are made for a variety of purposes, the four-wheelers being of types suitable for loads up to 20 tons and the two-wheelers up to 10 tons; The range includes extensible pole trailers for girders or timber and special low-loading models for machinery transport..
Dixon-Bate trailers all have two wheels and are of threeload capacities, namely, 6 cwt., 12 cwt. or 18 cwt. Features of the design are servo brakes—automatically applied by the action• of over-running the towing vehicle—ball-bearing hubs, semi-elliptic springs and low-pressure tyres.
Burdens up to.50 tons can be carried on suitable types of Dyson vehicle, the two-wheelers having capacities of from 5 cwt. to 5 tons, the four-wheelers range from 1 ton to 40 tons, and the 50-tonner has eight wheels. Special cable-drum carriers and low-loading types are listed.
It is notable that pneumatic tyres have been specified on several recent Atkinson-Walker deliveries. Owing to the high speeds attainedby modern lorries this is readily understandable. Eagle trailers are made to carry loads up to 50 tons ; the largest model is illustrated in another page in this issue. For 30-ton burdens an eight-wheeler is employed, four or two wheels being used on the smaller types
according to requirements. A full range of tipping bodies, tanks and low-loaders is listed, together with pole trailers.
One of the best-known American makes of trailer, the Fruehauf, is handled in this country by the Transport Equipment Co.. The typesinclude pole trailers, dumping trucks and 6 and 16-wheeled chassis for very heavy loads. In the -case of the six-wheeler the two rocking axles can be detached from the chassis frame to permit easy loading. Four patterns of Foden machine are made; • the largest will transport loads up to 10 tons ; one type is designed for tipping. Among the range of H.T.C. products—the smallest of which is of 15-ewt capacity and the largest to carry 10 tons —the self-tipping two-wheeler is probably most novel in design and can be handled by one man. Other models are fitted with spring drawbars.
Laurie trailers are made to carry Si tons or 5 tons, whilst Murdoch designs are both cable-drum carriers of 3-ton or 6-ton pay-load. All three Ransome patterns are fourwheelers, being designed for 3 tons, 4 tons or 5 tons. The Scammell five-tonner is equipped with pneumatic tyres and Is priced at Ina Pour-wheeled Tasker trailers will haul loads up to 10 tons, whilst the two-wheelers range from 1 ton to 6 tons in pay-load rating. Two models are specially designed for refuse-collection work. Tithe and Bell vehicles are all of the tipping variety and will carry loads from 2 tons to 7 tons. The heaviest pattern weighs only 2 tons unladen.