A Cable-winding Gear for Lorries
Page 48
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r\NE of the most interesting fittings on a general'L./purpose lorry, which may require to be used for a wide variety of work and, possibly, to operate in difficult circumstances, is a winding drum, and the more powerful the device the better. In the normal course, however, such a drum is expensive to incorporate in the original design of a vehicle, and still more costly to add to one already built. It must be soundly constructed and so arranged that it does not throw excessive stresses upon any part of the vehicle mechanism or its chassis frame.
Such a arum is constructed by Kennedy and Kempe, Ltd., Harewood Forest Works, Longparish, Hants, and its first cost is most reasonable, the trade price being about £25. One illustration shows how it is arranged on a Morris-Commercial six-wheeler, whilst that in which the parts are depicted in their disassembled state, indicates their simplicity.
It will be understood that, owing to differential action, a drum driven from an axle shaft would be geared up to twice the normal speed of the wheel, but, in practice, a winding drum of this type is generally used with a snatchblock, which brings the winding speed back to normal.
Official dynamometer tests have shown that a light fourwheeled lorry, such as a Leyland Cub, with the rear wheels scotched, and the body unladen, will give a direct pull of ton on the rope, which, by utilizing the aforementioned snatch-block, can be converted into a pull of 3 tons. The addition of a roller-type rope guide usually proves is88 to be an advantage, as it allows an angular pull in practically any direction. This cable drum has for some time been available for the lighter Morris-Commercial, Leyland and Fordson chassis and the Fordson tractor.