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SIMPLIFYING INFLATION OF LARGE TYRES.

2nd February 1926
Page 12
Page 12, 2nd February 1926 — SIMPLIFYING INFLATION OF LARGE TYRES.
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Which of the following most accurately describes the problem?

A New Valve Equipment which Provides for Wheel Interchangeability and for Ease of Access to the Inner Tyre on a Twin Wheel.

MHE provision of accessibility to the

valves of pneumatic tyres of large size is a great problem. The stiffness and weight of the cover handicap the garage hand in fitting a cover to a rim until he acquires adeptness amt the manipulation of the valve through a Irole in the rim adds to his difficulties. In the case of twin tyres on a disc wheel.. the valve of the inside tyre becomes somewhat inaccessible if it merely protrudes symmetrically through the rim in the way normal to tyre valves. The demerit of this inaccessibility is the fact that it is an excuse for—even an incentive to—tyre neglect. The Dunlop Robber Co., Ltd., has paid considerable attention to this subject, and has now put forward its solution to the problem.

The method adopted is to bring the valves for the inner and outer tyres to the outer face of the wheel, the discs to which the rims are riveted being provided with holes about 3 ins, in diameter immediately in line with the valve stem, the holes in the inner and

outer wheel discs coinciding. As a matter of fact, interchangeability between front and rear wheels and between inner and outer of the pair of wheels that constitute a rear twin is provided for by making only one form of wheel which can be used in any one of the three positions named. In the case of a fleet of vehicles this is a great advantage because of the obvious reduction in stores of wheels and of room.

The valve body is sharply curved n28 immediately below its. flange and butt by which it is attached to the inner tube of the tyre, so that it lies parallel with the bed of the rim, and it is accommodated in a groove which is created by slotting the rim through its gutter and half-way across and by a depression in the flange of the wheel disc. This slot enables the tyre with its inner tube in place to be slid on to the rim without any need for valve manipulation, the loose flange and locking ring being

employed as usual. The tyre thus mounted, the bead of the valve now protrudes sideways and below the gutter holding the locking ring, and nothing more is needed if the wheel is to go on the front axle. If it is to go on the rear axle, however, and is to be used singly, an elbow piece is screwed on to the valve stem, which then projects the inflation orifice outward through the 3-in, hole cut in the wheel disc. For the outer tyre of a twin wheel this arrangement is again pursued, but for the inner tyre, instead of an elbow Piece, a straight extension piece is employed which projects outwards through the hole in the opposite disc, and so again brings the inflation orifice to the outside. The hand hole in the wheel discs has been made sufficiently large to permit the fingers to pass through with the end of the flexible connection so that the latter can he attached to the valve body without the interposition of the elbow piece. Our own predilection, however, is in favour of the use of the elbow piece as a saver of time

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