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Patents Completed.

19th November 1914
Page 20
Page 20, 19th November 1914 — Patents Completed.
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Which of the following most accurately describes the problem?

Unic Universal Coupling. Lacre Hoisting Gear. Front-drive Gearing.

An Improved Variable-speed Gearbox.

E. W. THOMAS, No. 21,237, dated 19th September, 1913.— In the accompanying illustration the upper shaft represents the layshaft in the gearbox with a gearwheel keyed on each end of it. The wheel on the right-hand end meshes continually with the gearwheel fast on the engine shaft, while the wheel on the left-hand end meshes continually with a gear

wheel loose on the driven shaft. The end of the driven shaft is spigoted within the driving shaft in the usual manner. The layshaft also carries a pinion loosely mounted upon it ; this pinion is provided with teeth which engage similar teeth on the fixed gearwheel at one end of the layshaft. The driven shaft has a sliding wheel splined upon it; this wheel is made integral with a long hub with two sets of dog-teeth, so that it can engage with the gearwheel on either side of it.

The direct drive for top speed is obtained by sliding the dog-toothed wheel to the right so that it directly engages the driven shaft to the engine shaft. The second speed is obtained by moving the wheel in the opposite direction, the drive then being transmitted through the two fixed gears of the layshaft. The low speed is obtained by moving the loose pinion on the layshaft towards the right so that it first engages the large wheel on the driven shaft, and then is clutched to the right-hand wheel on the layshaft.

SOCIETE ANONTla DES AIITOMOB/LES URIC, No. 4645, dated under the International Convention, 4th March, 1913,—In this coupling the drive is transmitted from one shaft to the other through a pair of rings made of flexible material. These rings are held apart by washers, they are fixed at their outer edge to a spider on one shaft, and at their inner edge to sleeve-pieces mounted on the second shaft.

The cardan shaft itself is made in the form of a thin tube; this rests at each end upon a sphere or rounded member fixed on the shaft to which the cardan shaft itself is coupled. This maintains the two shafts in their desired relative position while allowing perfect freedom of movement.

THE LACRE MOTOR CAR CO., LTD., and J. S. DREWRY, No. 11,518, dated 9th May, 1914.—According to this invention the engine of a motor vehicle is used for driving a crane or any other auxiliary device which may be required.

The shaft at the bottom in the accompanying illustration transmits the main drive; it may be one of the shafts already

provided in the transmission, or 'a special countershaft driven from the engine. A loose sleeve is keyed upon this shaft and has two face-friction wheels secured on it at such a distance apart as to receive an edge-friction-wheel between them. This latter is mounted on a short shaft which drives the auxiliary device through a speed-reducing gear. In this instance it is shown as a worm gear.

The loose sleeve is moved longitudinally to bring either of the face-friction wheels into driving engagement by a hand lever whose fulcrum is connected by a link to the gearbox carrying the reduction gear. With this arrangement the main power-shaft is relieved from all end-thrust, both the original thrust and the reaction being taken by the gearbox.

THE THOMAS TRANSMISSION, LTD., and J. Cl. P. THOMAS, No. 22,246, dated 2nd October, 1913.—This specification describes a transmission gear by which a drive may be given to centre-pivoted steering-wheels.

The accompanying drawing shows a construction for heavy vehicles which embodies a reducing gear situated near the back wheel, but above the axle. The upper shaft illustrated on the right-hand side takes the drive from the differential, and transmits it by a single reduction gear to a shaft directly below it. This latter shaft is coupled by a universal joint to a short shaft extending through the centre of the wheel-hub. The outer end of the shaft is coupled by a universal joint to the outer part of the wheel hub so that it drives the wheel. The inner part of the wheel hub, which is tapered to fit the outer portion, is provided with roller bearings between it and the inner sleeve.

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