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Novel Dual-purpose Machinery Carrier

12th May 1939, Page 41
12th May 1939
Page 41
Page 41, 12th May 1939 — Novel Dual-purpose Machinery Carrier
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A Big Capacity Articulated Outfit, Comprising Respectively E.R.F. and Dyson Tractive and Trailing Units, and Equipped for Carrying Tracklaying Excavators or Rail wheeled Cranes

THERE seems to be no limit to the ingenuity that is expended on the development of vehicle, for specific purposes. A good instance is afforded by a big articulated outfit that has recently been supplied to M. Harrison and Co., Ltd., Leeds, for carrying, primarily, excavators equipped with crawler tracks and cranes having hanged wheels for running on rails.

A six-wheeler, built by E.R.F., Ltd., Sandbach, Cheshire, forms the tractive unit, whilst the detachable semi-trailer is a product of R. A. Dyson and Co., Ltd., 76-80, Grafton Street, Liverpool, 8. This is equipped with four rear wheels arranged in transverse line, each pair running on rocking axles, which are demountable from the frame.

We understand that, in service, it will often be necessary to transport the crane immediately after the excavator has been unloaded and it is essential that no time should be lost in executing alterations to the semi-trailer necessary for the (Efferent loads. Therefore, the vehicle is permanently adapted for both machines.

For the crane there is the equivalent of rails recessed into the platform, whilst hinged ramps are provided at the rear, which, when lowered, occupy the position of the outer wheels after these have been removed, and enable the excavator to be driven on to the platform. At the front there are two powerful winches, which are employed for Irawing the crane into position and operating the loading ramps. The frame of the Dyson part of the outfit is a compound structure of channel and plate, which tapers at the rear to serve as a ramp when it is lowered. Oak is the material used for the platform, which presents a smooth and unbroken surface, except where the rails are accommodated.

On each of the four rear wheels there are twin 9.75-20 low-pressure tyres, making eight in all. Considerable interest attaches to the means for securing and demounting the rocking axles. Bolted to each frame member, where it passes between the wheels suporting it, are two eye-bolts. These pass through slots formed at the fore-and-aft ends of steel castings, of U formation. The bolts are bridged by horizontal pins on which the axles rock.

Upon the upper ends of the eye-bolts are nuts with washers that recess into sockets in the castings, whilst above each pair of nuts is a tie strip, which prevents the bolts from swinging apart and releasing the casting. These ties ale secured by pins passing through the bolt ends.

All four trailing wheels are equipped with Girling brakes, operated by a hand-wheel from the side of the trailer, or by a special lever in the cab.

With a pay-load capacity of 30 tons, the semi-trailer has a platform measuring 15 ft. long by 9 ft. 9 ins, wide, and affording a loading level of 1 ft. 10 ins. above the ground. The overall length and width of the attachment are respectively 28 ft. and 10 ft. 6 ins.

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Locations: Liverpool, Leeds

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