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PATENTS SUMMARIZED.

25th April 1918, Page 22
25th April 1918
Page 22
Page 22, 25th April 1918 — PATENTS SUMMARIZED.
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Which of the following most accurately describes the problem?

An Expanding Wheel for Solid Tyres.

An inthresting design of road wheel is described in specification No; 113;818, by Lee 'Bros.The object is to overcome a difficulty frequently experienced when. fitting band tyres, in that there is very often a slight difference between the outside diameter of the wheel and the bore el the metal band upon which the tyre has been vulcanized. The present device airris. at expanding the. felloe of the wheel while still main taming it concentric with the hub. The wheel itself, although in one piece, is made with its two halves 'struck front different centres, so that at oppoSite points on the circumferencethere is a -step' and between this part of the wheel and the baSe of the tyre are thus formed two grooved wedge;shapecl spaces; Suitable wedges are made to fit these spaces, and by a. slight-collective movement of these wedges in either direction the ()inside diameter of the wheel may be in

creased or diminished. . . . , .

Paraffin Vaporizer.

A vaporizer for paraffin and similar fuels, in which the fuel trickles down a spiral passage surrounding a chamber which is heated by exhaust gas or other suitable Means, forms the subject of No. 113,832, by P. 0. Rowlands. The float chamber is situated near the top of this spiral pissage, of such a height that fuel will not flow unless under the influence of engine suction: It is claimed, furthermore, that the supply of fuel will be in direct ratio to the engine suction, and therefore to the needs of the engine. The greatest heat is directed towards the bottom coil, audit is expected, that the heavy fractions of the fuel willbe-vapor ieed at the bottom, and the lighter one:, at the top, where there is less heat.

Speed Regulator for Heavy , Motors; A further attack has been made upon the problem of suitably governing the speed. of a motor vehicle, by C. 0. Marshall, in No. 113,845. Two centrifugal governors are provided, one of which is operated by gearing from the engine; the ether is in connection with the wheels of the vehicre. These governors operate, as may be observed by reference. tothe 'drawing, upon inclined planes, the total height of which determines the opening of the throttle valve.

Dunlop Disc Wheel.

The Dunlop Co. has, patented, in No. 113,815, a construction of disc wheel for which a maximum strength is claimed, with a minimum expenditure of material.

Detail Improvements. .

A magneto coupling designedto give, automatically, rapid rotation of the armature when the engine is being started, forms the subject of N6. 113859, by D. Y. Wheatley. Referring to the drawing, the half of a coupling -ea the armaturespindle is provided With two pins which work in slots on. that half of the coupling which is sec-ured to the .driving spindle.' These pins are kept in place by means of springs Which are of such a strength that on the preliminary • turning of the-'starting handle; the ,Yriv • ing half over-runs th,e onher half; This preceSs is facilitated by the ' armature side of the coupling being held by a catch. A little later, however, a projection on the coupling throws this catch put of.gear, and the armature half of the coupling; thus freed, is rapidly revolved under the influence. of -the two springs. When the engine has started; centrifugal force operates to keep the catch out of gear, and the coupling thereafter works

normally. , .

An ingenious carburetter on simple lines is described by G. W. Watson in 113,915. The throttle valve is a hollow piston moving vertically, and when at its lowest position it is in contact' with the main jet, In the bottom of this piston-like throttle valve, and opening into its interior, is a smaller orifice which serves as a pilot jeb.

A. Good, in No: 113,875, provides for the rapid manceuvring of a !rioter vehicle by arranging that the main driving wheel of the rear axle should be alternatively connectable to one of either of the sun wheels of the differential gear. Spring washers of special shape. are used by N. A. Twitchell, in No. 113,920, as a safety' lock for a nut.

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