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A Portable Swivelling Crane.

15th February 1917
Page 15
Page 15, 15th February 1917 — A Portable Swivelling Crane.
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Which of the following most accurately describes the problem?

Easily Carried on a Lorry, with Suitable Tongs and Lifting Dogs.

A motor vehicle engaged in any kind of contracting work, or work connected with the handling of heavy materials, metal goods, boxes, crates, shells, boilers' etc., is Scarcely complete without some sort of portable a-nd easily-adjustable crane. In fact, all loading and unloading operations in Connection with a motor vehicle should, if possible; be carried out with mechanical apparatus, as, otherwise, considerable time is lost over these operations, and the efficiency of the vehicle is irepaired. Especially so is this the case now, having regard to the shortage of labour.

In shell factories and munition works • there is a considerable amount of lifting of heavy material necessary, and a crane which can be carried on a motor vehicle from one part of the factory to another, or from factory to loading or unloading station, etc., is indispensable, and such a one is that placed on the market by Pickerings, Ltd., Stockton-on-Tees, a portable swivelling crane made in three sizes to carry loads of 200 lb., 600 lb., and-780 lb., and provided

_ with shell tongs suitableall operations, and a shell-liftng dog.

Great Variety of Tongs.

The tongs for handling shells can be supplied for shells ranging from 3 ins. to 18 ins, in diameter, and when ordering, the size should be • given, also the process for which the tong is required, and whether the shell will be hot or cold, rough or finished. Some idea of the variety of the tongs supplied can be gathered from the list given by the makers, including tongs suitable for small, square bifida, for rough shells to be lifted from and retained in a horizontal position, for an internal grip, for large square billets, with horizontal lead face for finished shells, for lifting shells automatically from horizontal to vertical, and nose-end tongs for rough and finished shells. The tongs are made of mild steel, and are all made to dies. Apart from shells, these tongs can be had to lift boxes, crates, etc., one haying special swivelling jaws for gripping battens, useful for ammunition cases.

Crane chains and slings for munition works are also aupplied, and are manufactured on the same prern ises, The cranes themselves are selfsustaining, and have a swivelling , motion ; they are fitted with ball bearings.

The Automatic Shell-lifting Dog.

Fothergill's shell-lifting dog, suitable for this crane, is automatic in action. The simple mechanism can be at once understood by reference to the accompanying drawings showing the three positions of the operation. The dog is lowered by the chain, and the jaws automatically expand until the distance between them is equal to the diameter of the shell. The jaws then drop, and automatically grip the shell, as it is lifted on hoisting. To release the shell, the apparatus is lowered, and one of the jaws is slid upwards. These dogs weigh approximately from 26 lb: to 106 lb., and the prices vary from El 17s. 6d. to £7 15s. 6d., according to the work for which the dog is required. These prices are for dogs ordered in numbers not „fewer than six, tingle dogs being 10 per cent. extra.

It will be recognized that a swivelling crane fitted with tongs and iogs as described, capable of lifting 200 lb., could easily be carried on a motor vehicle, and the utility of both could in this manner be considerably increased.

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