A Trailer for 65-ton Loads
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M/1ANUTACTURERS of ship engines and boilers Mare frequently faced with special problems in transporting their products from the works to the shipyards. Dismantling and transporting such equipment in parts adds greatly to the cost and is unsatisfactory from many points of view.
Chas. D. Holmes and Co., Ltd., the well-known engine and boiler manufacturer of Hull, has, for many years, been confronted with such difficulties, and, until certain objections were raised by Hull Corporation, made use of a four-wheeled, unsprung, steel-tyred trailer. Operation of this outfit proved difficult, however, and the loading height of the vehicle provided serious problems.
In order to overcome these troubles, and to satisfy the requirements of Hull Corporation, R.. A. Dyson and Co., Ltd., 76-80, Grafton Street, Liverpool, has evolved for this operator a special low-loading trailer designed for 05-ton loads.
Twelve wheels are used, each having triple tyres. The leading four wheels are an integral part of the turntable arrangement, the second line of wheels being mounted on swivelling axles and connected by a steering arrangement to the turntable, so that when this is rotating these wheels follow in the track of the front wheels and no skidding occurs.
The rearmost wheels are trailing wheels, but are connected to the second line of wheels with a compensating device, so that the load is evenly distributed.
In order that road camber and other irregularities may be provided for, each pair of wheels is mounted on the ends of a short axle and sprung by two springs carried side by side on oscillating trunnions.
With the oscillation of the short axles and the compensating arrangement between the second and rear line of wheels, each of the eight wheels in the rear bogie carries an equal load, irrespective of road camber or inequalities of surface.
Even with a full load, the tyre loading per inch of tyre width is as low as 0.35 ton, which is, in fact, less than is rne case with many solid-tyred lorries.
The frame members are of box section, being built up of two 8-in. by 3-in, channel members with a 13-in, by i-in. steel plate riveted at the top and bottom. The brakes are manually operated from the rear of the outfit and, despite the small size of the wheels, 16-in.-diameter drums are provided with wide shoes.
All wheels are mounted on Timken roller bearings, the eight rear wheels being shod with Dunlop triple 20-in. by 26-in. by 6-in, solid tyres. The four leading wheels are equipped with Dunlop triple 20-in. by 14-in. by 6-in. solids.
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