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Twin-Pneumatic Tires. Constant-mesh Gearbox. Non-slipping Treads.
Copies of complete specifications of the patents published on this page can be obtained from the Sales Branch, Patent Office; Holborn,. W.C., at the cost of sixpence for each specification.
3. S.W1r.onn AND S. S. LORD, No. 11,364, dated 8th May, 1914.—A non-dip tread for pneumatic or solid rubber tires is formed by chains mounted in the" tread. As illustrated, two peripheral grooves are formed in the tread, and a chain is laid
round the tire in each of them. In the case of a pneumatic tire this is simply accomplished by deflating the tire.
The spaces between the links of the chain are occupied by a filling of leather or other material, which increases the wearing properties of the chain and can itself he easily renewed when worn. A bed or cushion is placed at the bottom of the grooves in which the chains lie.
• SOC. ANON. L'EVOLUTION AUTOMOBILE (B.D.P.), No. 21,690, 1914, .datedunder International Convention 27th November, 1913.—The principal -feature of this gearbox is that all the maingearwheels are kept constantly in mesh, and, therefore, permit the use of double-helical teeth."
The driving shaft on the right-hand side has a double pinion keyed on to it. On the left of this is a loose pinion with inside and outside sets of teeth, and a clutch, sliding on the shaft, can mesh with the inner set of teeth. The driven shaft carries a gearivheel fixed on its end, this wheel having external double-helical teeth and internal plain teeth.
The countershaft carries two loose gears, meshing with the double pinion on the driving shaft, and, to the left of these, a fixed double pinion-.
The first and second speeds are obtained by moving the countershaft. clutch to the •right and left respectively, and the third and top speeds are obtained by moving the clutch on the driving shaft to the right and left respectively. . The'reverse, which is the novel feature of this gearbox, i& obtained by an auxiliary gear driVen from the right-hand wheel on the countershaft. THE DUNLOP RTJDBER CO., LTD., AND W. IvVrtmar, No. 8832, dated 76. April, 1914.—This specification describes a construction of wheel which permits twin tires to be used without extending the width of the track beyond that of a single
tread track. The rim of the wheel is made of a sufficient width to accommodate two pneumatic tires, and a distancepiece is fastened around the centre of the rim. The two sides of the rim ar.d of the distance piece are made with hookshaped edges or flanges to grip 'to beaded edges of the tire.
The rim is so positioned on Jhe wheel that it does not extend outwards beyond the end of the huh, and a triple set of spokes is provided. Two of these are fixed at the inner end of the hub and one at the outer end.
F. J. GORNALL, No. 12,186, dated 18th May, 1914.—This specification describes a carburetter of the wick type, in which the throttle is so shaped as to cause variations in the amount. of fuel supplied by it for different openings. In the construction illustrated a cylindrical throttle with an inclined slot is used, this slot being parallel with the wick, which is inclined towards the air inlet. When the throttle-valve is slightly open the induced air is deflected at a high speed downwards through and past the wick, so that it retards the upward flow of the petrol, thus limiting the supply. When the throttle is more fully opened the air flaws in a vdirection more nearly transverse to the wick, and the suction thereby induces a larger flow of fuel.
In an alternative construction, the air is arranged to flow only past the upper end of the wick when the throttle is nearly closed, but when it is opened more of the wick is .subjected to the flow of air, thus giving a result similar to the first construction.