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Detachable Rims for Heavy Vehicles.

20th May 1924, Page 13
20th May 1924
Page 13
Page 13, 20th May 1924 — Detachable Rims for Heavy Vehicles.
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DING a recent visit to the premises af the Saurer Commercial Vehicle Co., Ltd., 21, Augustus Street, London, N.W. 1, we noted that one of . the vehicles which we examined was equippedwith a very fine set of caststeel • wheels with detachable rims, known as the Simplex, marketed by the Electric Steel Castings Co., Ltd., Wentworth Chambers, Pinstone Street, Sheffield. The name of these wheels will certainly be familiar to many of our readers. They are made. by Societe Anonyme des Acieries (formerly Geoqes Fischer), of Schaffhouse, Switzerland. What struck us particularly about these wheels was the extreme ease with which the rims, together with the tyres, can be removed or replaced, combined with an adequate factor of safety, owing .to the incorporation 91 a special bayonet device resembling the .breech

block arrangement on large guns, and so arranged that, when once the wheels are in position, the pressure of the air in the tyres keeps the rims so firmly secured that there is no possibility of creep or of a rim becoming separated from the rest of the wheel.At the same time, purely as a preventive measure, three small locking pins are also provided.

This new wheel has been thoroughly, tested in cross-country trials and under the hardest conditions of working on the Swiss mountain reads.

Each wheel consists of a spider cast in electric steel, two galvanized halfrims, three security pies in high-tensile steel, and an aluminium packing rim which is inserted between the half-rims. In addition to tilde, three special clamps are employed for compressing the half-rims together while they are being mounted or demounted from the spider. Each half-rim has formed integrally with it a number of dovetail teeth which lock into suitable dovetails in the spokes and also act as bearings for the aforementioned clamps.

The whole arrangement weighs little, if any, more than a cast-steel wheel of the ordinary.type, and'it is stated that. a\ east-steel wheel with a giant pneuniatic tyre is actually lighter than the equivalent wooden wheel with a solid Lyre; in fact, in some caseswith heavy vehicles, this difference has been as much as 660 lb. per set of wheels in favour of the pneumatic.

In demountin.g the Simplex rim the -wheel is jacked up, the tyre deflated, and the half-rims pressed together by tightening the three clamps. The three

locking pins are then extracted, the combined rim turned to the right to release the bayonet connections, and lifted off. Then, if the clamps be re. leased, the tyre can be easily peeled Off the half rims.

In reassembling, each half-rim slips easily into the tyre. The two are then compressed together by the 'clamps, the rim and tyre;pushed on to the steel centre and turned to the left into the bayonet lock, after which the pins are inserted and the tyre inflated.

Beaded-edge or straight-sided tyres can be fitted or removed with equal facility.

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