A NEW MOTOR-ROLLER.
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A Fowler Machine Built in Three Sizes and Resembling the Ordinary Steam-Roller in its General Aspects.
I NCI1EASINO attention is being directed to the design of motor road rollers, for which there is now a call from /many quarters. Such vehicles de
not require the same class of driver ES the steam-roller, and, they can more
easily be operated in districts where a scarcity of water may render the movement of steam-rollers a matter of some little difficulty.
The latest machines produced at the -works of John Fowler and Co. (Leedsl, Ltd., in outward appearance closely resemble the standard steam machine, but their internal construction is, of course, very different. They are built in sizes of 4-6 tons, 8-10 tons, and 12-14 tons, and their general design they are much the same. The chief similarity to the ordinary roller lies in the arrangement of the front portion, which con
sists of a forecarriag-e head carried by
channel steel side-members and holding a stout fork in wbich are two rollers.
The width of these together is 4 ft. I in which is wider than the distance between the inner edges of the two rear rollers, so that even when the machine is turning the whole width of the road surface covered by it is rolled. • The design of the forecarriage head is very interesting. It is supported on the fork through the medium of a stout volute spring and ball bearing, so that it is partly isolated from shocks, whilst the use of the ball bearing renders easier the steering.
The ovecrhead-valve engine has a detachable head, which is fastened right
through to the crankcase, -whilst the
valve-operating rods are enclosed in tubes which also act as breathers, so that the rods are adeouately lubricated. Oil is force-fed to all the bearings except those of the camshaft, which are lubricated by splash. If necessary a vaporiser can he fitted so that pardfin may be used as fuel.
The radiator is situated behind the ferecarriage head bracket, water is cir culated through it by means of a centri
fugal pump, coaling being assisted by a four-bladed fan driven by a belt. Within the flywheel, and protected by a cover, is an ppicyclic gear, which, gives the
reverse motion. • • The clutch is behind this gear and consists of a single plate between rings
of Verodo, one ring being riveted te the clutch casing and the other ring being carried on a pressure plate, Which is forced into position by means of coil springs.
From the clutch the drive is taken through the universal joint.to the casing containing the differential jackshaft and the change-speed gearing, which gives
three. speeds, varyin.g from 11 m.p.h. to 3,'7 m.p.h. These gears are seinewhat curiously situated behind the jarkshaft, the worm wheel of the differential being driven by a worm forming part of a sleeve through which passes the primary shaft, the rear end of which is oplined to carry the sliding Pi121011■1
there is also a Ia.yshaft, this being splineal to carry a double-sliding pinion The gears are operated through a gatechange lever, the epicyclie reverse gear in the flywheel being operated separately, reversing being effected by a friction band on the outside of the clutch casing. This arrangernent permits the three speeds to be used for both forward and reverse.
The final drive to the rear wheels is by spur gears meshing with-large spur wheels keyed to the live axle and, when necessary, the differential gear can he locked from the footplate.
An important detail is the provision of a belt pulley driven from the layshaft.
The largest roller has an engine a 40 b.ht.p., the second one of 35 b.h.p., arid the smallest a -30 bhp. unit. In the largest type: the width rolled is
6 ft. 3 ins. • • ' We have not yet referred to the braking. This is effected by expanding shoes, lined -with Ferodp, working,. in brake drums forming part of the. final drive spur wheels. The brake is operated by a hand wheel conveniently situated close to the driver.
The rear rollers, which act as driving wheels, are 5 ft. 6 ins, in diameter and I ft. 6 ins, wide in the largest type. These wheels are, bugled, the drive between them and the spur wheels being _effected by large pins which pass through the wheel hubs into sockets in the spur wheels.