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Patents Completed.

15th February 1912
Page 24
Page 24, 15th February 1912 — Patents Completed.
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Complete specifications of the following patents will be sent to any address in the United Kingdom upon receipt of eightpence per copy at the Sale Branch, Patent Office, Holborn, W.C.

Another Form of Radiator Construction.

Charles Tuckfield and Another.—No. 213, dated 4th January, 1911.—This radiator is composed of plates, preferably corrugated, which are bolted together in pairs, the edges being left flat to form a water-tight joint. A miniher of of pairs of plates are assembled together in a casing which is closed at the sides but open at the top and bottom. The air circulates between adjacent pairs of plates and the water between the plates which are secured together. An air smut) is fitted at the bottom and a louvre at the top. It is stata,41 that the natural draught, caused by the hot air rising between the plates. greatly increases the efficiency of the radiator. One of the units may be constructed with the plates held a considerable distance apart to act as a water tank.

Chain-driven Reducing Gear.

Coventry Chain Cu. (1907), Ltd., and Another.—No. 7525. dated 25th Nardi, 1911.—in the reducing gear described in this specification, the driving and driven shafts are co-axial and all the chain wheel are fast upon their respective shafts. In the type here illustrated. the driven shaft is provided with two ball bearings in the gearease, and the driving shaft has a bearing formed inside the driven shaft and a separate ball bearing in another wall of the gearease. The speed reduction is obtained by the use of different-sized wheels on the main shaft and on the lay shaft. By suitably varying the size of these wheels, any desired reduction in speed may be obtained. Various modified forms of the gearbox are described and illustrated in the specification.

Variable-speed Gear.

C. J. L. Moore.—No. 23,219, dated 20th October. 1911.—This invention relates to infinitely-variable speed gears of the epicyclic type. The driving shaft on the right-band side is co-axial with the driven shaft on the left-hand side and has a bearing in it. On the driven shaft there is keyed an eccentric, and it has a strap provided with external and internal teeth, the latter projecting towards the driving shaft. The external teeth mesh

ith internal teeth formed on a casing carried by the driving shaft. The inteiatal teeth of the ecceatric strap mesh with the gear on a sleeve loosely mounted on the driving shaft, the sleeve being provided at its other end with a worm wheel which is engaged by two worms carried in bearings in the casing fixed on

the driving shaft. These worms are driven by bevel gears from a gear ear ried on a brake drum loosely mounted oh the driving shaft. Another brake drum. also loosely meunted on the driving shaft. is geared to the first brake drum by a planetary gear carried on a disc secured to the driving shaft. The action of the gear is as follows. When both brake drums are allowed to rotate freely, they are carried round with the driving shaft and the casing, and there is no relative motion between the drums and the casing, so that the worm gears are unaffected. The central sleeve is not rotated by the worm v.,...ars, and the equivalent

of a direct drive is obtained. If the

outer or right-hand brake drum be retarded, the planet wheels coupling it to the inner drum W ill be set in motion and cause. that drum also to be retarded. This retardation is transmitted through the bevel gear to the worms and to the sleeve which acts upon the internal teeth of the eccentric strap, causing it to revolve on the eccentric in the same direction as it is being driven by the internal gear on the casing. The result is, therefore. that the eccentric and driven shaft are rotated at a reduced speed. By increasing the hold On the outer brake drum, its speed will be reduced to such an extent that finally the strap revolves on the eccentric without giving it any motion. so that a free-engine effect is obtained. If now the inner brake drum be held, the worms will be driven more rapidly. and the eccentric strap will he driven by the Alevve more quickly than

the motion of the casing will allow, thus causing the eccentric to revolve in the reverse direction and giving a variable reverse speed.

Sparking Plug.

Leonard Reginald Junes.—No. 5790, dated 8th March, 1911.—This invention relates to sparking plugs of the type in which the insulator is formed in two separate portions, and its primary object is to provide means for allowing for the

free expansion of the various parts. The shell of the plug, formed of metal, is screw-threaded on the outside to fit into a screwed hole in the cylinder and is formed as a nut in the usual manner to provide means for screwing it. up. At the inner end that is coned, points are provided from which the spark passes to the central conductor. inside this portion lies a porcelain insulator surrounding the central conductor, and above it lies a second insulator, preferably formed of mica, which is held in by a cap nut screwed On to the body of the plug. The mica insulator is matie sufficiently thick and rigid to ensure a gas-tight joint's being obtained at the lower end of the other insulator when the whole is screwed up tightly.

A Carburetter Full of Pebbles.

,fames Williams.—No. 9,285. dated 13th April, 1911.—This specification describes a surface carburetter, which comprises a deep vessel nearly filled with smooth natural pebbles and provided with an air inlet at the bottom and a fuel inlet at the top. The pebbles are supported clear of the bottom by a grid, nnderneath which any heavy spirit. which has not evaporated is collected. The mixture is drawn off from the upper part of the chamber. These pebbles may he graduated in size and arranged in layers, or they may be assembled in any order. Alternatively the bodies may be of artificial formation, formed for example of a various substance, or to save weight may he made hollow. 11


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