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PATENTS SUMMARIZED.

11th October 1917
Page 22
Page 22, 11th October 1917 — PATENTS SUMMARIZED.
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Which of the following most accurately describes the problem?

Dunlop Non-skids.

The difficulty with the majority of nonskid tyres is that the rubber excrescences which have the effect of reducing the tyres' tendency to slip, are only effective during a portion of the tyres' useful life. They wear down, and the surface of the tyre becomes smooth, thus Rising its special claims to act as a nonskid. A recent Dunlop patent, No. 109,070 concerns a formation of the tyre which should prove an effective anti-skid.

Several drawings accompany the specification, and from them we have selected two which illustrate clearly the principal features of this invention. One shows the design as applied to a pneumatic tyre, the other as used on a solid. The tyre is so moulded. that in section the periphery presents a series of serrations. These are so shaped that when the tyre is bearing on the road, it presents sharp edges to the mud or sand and prevents it from accumulating under the tyre.

A Daimler-Lanchester Patent.

An interesting variation of petrolelectric design is exemplified in patent specification No. 108,970, the inventors being those well-known engineers, the Daimler Co., Ltd., Coventry, and F. W. Lanchester.

The arrangement is diagrammatically illustrated in the drawing which we reproduce on this page. An electric generator and motor are disposed by the side 'of the main through line of abating which runs from engine to axle. The generator is driven from the engine by a pair of gears; it provides current to the motor, which drives the propellershaft by means of a similar pair of gears. The engine shaft is also extended past the gearwheel which drives the generator,and is coupled to a flexibly-jointed ihaft, at the rear end of which is a frit> ion clutch of normal type. The clutch is so placed that it intervenes between the gear which drives the generator and that, to which the drive is transmitted by the motor. It is thus rendered possible, be means of this clutch, to drive direct , f-nm engine to the propeller shaft withoat using the electric portion of the transmission at all. The provision of suitable clutches, by means of which it is also possible to throw out of gear either or both of the gears which connect he generator and motor to the main shaft, is also covered by the specification. It is pointed out, however, that it, may be better to allow these corn portents to remain coupled up, as in that manner the rotational recoil vibrations will be absorbed owing to the opposite direction of rotation of the engine flywheel and generator armature. It should be noted that the generator and motor ..are geared up with regard to the engine shaft, that is to say, the wheels are so proportioned that the electric components run at a higher speed

than the engine shaft. By this means the generator and motor may be designed for a speed corresponding with the least possible weight.

Unusual Tractor Design.

Quite a distinct type of agrimoCor is described in specification No. 108,833 by its inventor, Mr. S. A. Kenney, of Burrel Street Works, Ipswich. The main frame is carried by a pair of land wheels, and on this is a supplementary frame, the connection between the two being by means of a. screw-jack. By this means a certain amount of adjustment of the relative heights of these two frames is possible. The upper one carries the en gine and transmission gear. It also

• carries a circular jig round which the driving wheel, or rim revolves.

The rim is made of three sections. The inner one is in the form of a rail, and runs on a number of rollers, which are carried by the jig to which we have referred above. In the centre are cogs, after the manner of an internal gear wheel, and with these a pinion driven by the engine meshes. The middle section of the rim is a deep wooden felloe, and surrounding this is a rim of steel to which may he attached spuds or strakes of the usual kind. The rising and falling arrangement of the two frames permits of the main level of the tractor being adjusted when ploughing so as to compensate for different depths of furrow.

Tags

People: S. A. Kenney
Locations: F. W, Coventry

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