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Foden.

19th October 1920
Page 47
Page 47, 19th October 1920 — Foden.
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5-ton Rubber-tyred Steam Wagon.

STAND, No. 3.

THE OLD ORIGINAL, born goodness knows when, and still going strong, Foden, is attracting its full meed of attention from visitors, on Stand No. 3. There is only one machine to see, a five tonnes, with standard wagon body. This wagon for those who are not acquainted with ;team wagon design was fully described in our issue of ! the 28th ult. It is an overtype, with the engine in full view of the driver. The boiler is of the locomotive type, with smoke tubes running the full length of the barrel. The engine is a compound two-cylinder, with cylinders 4 ins. -and 61 ins, diameter by 7 ins. stroke. The boiler is constructed to work at a pressure of 200 lb. to the square inch, and the engine will develop 30 h.p. It is provided with highpressure working gear, whereby, for special occasions, it is possible to turn the steam direct into both high and low pressure cylinders, in order to obtain a little extra rower.

The front axle is centrally pivoted, the steering gear being by worm and chain, Pt is customary with the majority of overt-spa wagons. The rear axle is of the traction engine type, in which one wheel

is firmly attached to one end of the axle whilst the other wheel is secured to a stout steel sleeve carrying one of the differential crown wheels. The Other crown wheel is keyed on to the axle. The differential gear, which is driven by a single roller chain from the transmis• sion gear, divides its efforts between the through axle and the sleeve. Locking of the differential is achieved by pinning that wheel which is keyed to the sleeve to a flange on the through axle, when the two wheels revolve in unison. This arrangement is, of course, very useful when the wagon is negotiating difficult road surfaces, and particularly when one wheel is inclined to slisPand-thus absorb the whole of the turning effort of the engine.

One of the most interesting things about this wagon is the driving mecha. nism of the feed pomp. Instead of a gear drive, the-pump is driven through a pair of friction wheels which are engaged with each other by the movementof the driver. _The pump is therefore only called upon to operate when actually needed.

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