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Britain's Largest Pneumatic-tyred Machine Trailer

25th November 1949
Page 37
Page 38
Page 37, 25th November 1949 — Britain's Largest Pneumatic-tyred Machine Trailer
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WHAT is claimed by'the maker to be the largest pneumatictyrcd trailer to be built in Britain, was recently completed by Cranes (Dereharn), Ltd. South Green Works; bereham, Norfolk. Built to the order of George Wimpey and Co., Ltd., the well-known contractor; it is for the specific purpose of transporting a90-ton excavator Used in outcrop

coal mining. . . There is, however, no feature in its design which would prevent its being used for any type of indivisible load coming Within its rated loading capacity. . .

Each of the two main longitudinal members is fabricated by 'electric welding from two steel channels which are formed into a box section by welding L to them, at the top and bottom, 2-in. steel plate. These side members are tied together by tubular cross-members, which are carried right through the side members and welded to them. The open ends of the cross-members are fitted with diaphragms which are welded-in at the one operation.

. One of the cross-members is used as an air reservoir to supplement a separate. reservoir mounted forward. At their forward ends the main members are upswept into a swan neck and carried forward to embrace the upper

portion of the turntable assembly. The bearing surface of the turntable is comprised of phosphor-bronze segments which, when wear develops, can readily be replaced. The 16 wheels on which the tractor is mounted are arranged in units of four, the general arrangement of the bogie assembly following standard Crane practice. An important departure in the design, however, concerns the axle mounting.

New Design Feature Hitherto, the journals at each end of the beam have been mounted in plain bushes, and whilst this arrangement is perfectly satisfactory for oscillation, wear and end play could not be avoided. and the ingress of foreign matter was difficult to prevent.

In the present design, each shaft is mounted at its outer end on a largecapacity self-aligning roller bearing, the after end being steadied on a smaller bearing of the same. type. Not only does this arrangement provide easier action, but the assembly, in general, should give a longer working life as compared with the use of plain bushes.

Every wheel is braked, the shoes used being of the Girling two-leading type, and air-pressure operated on the Clayton Dewandre two-pipe-line system. Each pair of wheels has its own brake cylinder, the assembly being mounted between the wheels above the bogie beam. The split-type wheels carry 14.00 by 24.00 24-ply Dunlop tyres runningon a pressure of 95 lb. per sq. in.

For parking purposes, mechanically operated brakes are provided on the

rear wheels of the rear bogie. The means for operation is a hand wheel.

To facilitate loading, the rear bogie is constricted so that it can be withdrawn after the rear end of the trailer has been lowered to the ground. This object is achieved by building up a gantry on the massive box:section crossmember which carries the bogie cross

shaft. .

This gantry " sits" on the head of a Norton 50-.ton screw jack. To tower the back end of the trailer, the load on the pins passing through the various arms and links has first to be relieved and the pins withdrawn. The jack is then lowered until:its head is clear of the gantry, prior to which, of course, the back end of-the. trailer has touched ground. The rear bogie assembly is then free to be wheeled clear.

To stabilize the main cross-member of the bogie when the bogie is withdrawn, resilient members are taken from the axle beams up to the box section cross-member on which the jack is mounted.

Just forward of the rear bogie, and bolted and pinned to the main-frame members, are two jacking brackets which form jacking points for use should the built-in jack fail to operate from any cause.

At the forward end of the mainframe members there are two shackling members which stand out from the upper end of the swan neck. The shackles are mounted on cone-shaped support members which virtually form extensions of the tubular, cross-member introduced at this point. This method of mounting the shackles provides a high degree of resistance to stress, no matter from which direction it may be imposed.

This new Crane trailer should make an appeal in overseas markets. Whilst in the present instance it has saved dollars, there is no reason why it should not earn them. It is, indeed, a fine example of British engineering skill. In general design, the new Neal crane incorporates the outstanding features of other models in the range. Hoisting, slewing and travelling are all controlled by hydraulic means, whilst steering and derricking are manually operated. This and other models are shown by R. 1-1. Neal and Co., Ltd., Plant House, Ealing, London, W.5.

Chaseside Oiler

Examples of the well-known Chaseside mechanical shovel are exhibited by the Chaseside Engineering Co., Ltd., Station Works, Herts. A feature of interest is that, where desired, a Perkins P6 oil engine can now be fitted in the Fordson Major tractor which forms the basis of the equipment.

The Bray Hydraloader, which has hydraulically operated lifting arms, is shown by Greenham Equipments, Ltd., Clayton Road, Ruislip Road, .Greenford, Middlesex. The basis of this machine is also a Fordson Major tractor.

George Cohzn, Sons and Co.. Ltd., • Wood Lane, London, W.12, is exhibiting, amongst other equipment, an example of the Jones KL44 mobile crane. This is designed to lift a maximum load, with 24-ft. jib, of 4 tons at 8-ft. radius. It is powered by an oil engine and weighs 10 tons.

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Locations: London

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