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22nd November 1927, Page 142
22nd November 1927
Page 142
Page 142, 22nd November 1927 — Clayton.
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MWO steam-vehicle products are

staged here, the new overty-pe 6-7tanner and the well-known Clayton undertype. It is interesting to see the way in which this maker is developing the two models side by side, recognizing that each has its own sphere of use fulness. The overtype is not altogether a new model, but it embodies a large number of technical improvements which should make it a very popular machine amongst those who favour steam Wagons. It has a loco-type boiler with a heating surface and grate area approxitnately 30 per cent, larger than en previous models. The boiler is of the company's patented design equipped with a curved firebox crown entirely devoid of roof stays or pressings, and the surface being perfectly plain, the deposit can easily be cleaned / away and the danger of damaging the plates through overheating is obviated.

.Steala at 330 lb.. working pressure is supplied to a compound-cylinder engine, which is equipped with a double H.P. or non-compounding device by which th,?. driver can increase the power by some 75 per cent. for short periods. On the H.P. cylinder use is made of a balanced piston valve, whilst a" flat slide valve is employed for the L.P.cylinder.

Ball and roller bearings are employed for the crankshaft, and as these have an exceptionally long life maintenance will be rendered much easier, whilst no difficulty will be experienced through differences in the meshing of the gear teeth due to settlement of the shaft, as sometimes happens when plain bearings are employed.

An important improvement lies in the employment of a three-speed gear instead of the two-speed pattern pre

viously adopted, ,Whilst the steering gear is at the worm-and-nut type in eon-junction with road wheels controlled on the Ackerman principle.

Front suspension is by two semiellipticsprings. Two independent sets of brakes are fitted to each rear wheel, the • shoes working onindependent drums or rings. Front-wheel brakes can be fitted if required.

The un.dertype wagon has a watertube boiler of the cross-tube type, fired through a central chute. It operates by superheated steam at 260 lb. prosand has a double-cylinder H.P. engine placed horizontally between the axles, final drive being by single roller chain to a differential on the: rear Rile.

• There are two eccentrics, one for each cylinder. These are mounted on a layshaft driven off the crankshaft by gearwheels. The layshaft is hollow and contains a sliding shaft in which notches are. cut to form two inclined Planes at right angles to each other— one for each eccentric. Engaging with each of. these planes there are two pads which bear against the sides of a square hole cut: through the eccentric sheave. By moving the sliding shaft endwise the eccentricity can be varied from full ahead to full reverse, giving any position of cut-off.

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