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COMBUSTION CHAMBER MODIFICATION.

24th August 1926, Page 64
24th August 1926
Page 64
Page 64, 24th August 1926 — COMBUSTION CHAMBER MODIFICATION.
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Which of the following most accurately describes the problem?

A Resum6 of Recently Published Patent Specifications.

QUIDO FORNACA, of Turin, in specification No. 255,337, says that the efficiency of an engine can be appreciably increased and the consumption of fuel reduced by certain modifications in the form of combustion chamber employed. He points out that the ideal chamber would be a spherical one with the spark taking place in the centre.

He, however, says that such a chamber is not practically possible, so he adopts a compromise which fits in with usual practice in engine construction.

Instead of providing a pocket for the sparking plug he brings the points of the plug nearly in line \Nith the cylinder wall and just under the inlet valve. He forms the top of the piston so that it leaves a space on the side near the sparking plug of sufficient capacity to contain the compressed mixture.

He claims that this arrangement sets up a whirling motion by reason of the shape of the piston head, which facilitates the propagation of the explosion when ignition takes place.

Another Locknut. .

ERIK EKSTROM, of Gothenburg, in specification No. 255,308, shows a simple form of lockout. The formation of the nut, in the first place, is, as shown, like an ordin ary nut, but with an extension of smaller diameter at the top. After forming and tapping, this extension is pressed downwards until the threads are slightly compressed, like die folds of a bellows. This compression takes place only in the extension, as, owing to its reduced diameter, it is more easily compressed than the body of the nut.

The effect of this is that the nut can be screwed down on its bolt so far as the body of the nut, but after that the nut is slightly tighter on its bolt, and this tightness is relied rpon to prevent it from working loose.

An Expanding Pulley.

A VERY simple form of expanding pulley is shown in the specification of W. Chinn and Chinn's Patents, Ltd., No. 253,680. The special use for which the pulley is recommended is for the drive of speedometers and similar instruments, where exact calibration is necessary. Various forms in which the plan can be applied are shown, but the one we have selected is perhaps that most suited to motor vehicles. Two flanges are provided, with a means of bringing them nearer to each other, such as a screw thread. The space between them is occupied by a yielding material such as rubber, which expands outwards when the flanges are brought nearer to each other, and HO increases in diameter.

A Novel Suspension.

A CURIOUS form of suspension

253680

is shown by W. L. Adams in specification No. 236,243. Two discs, each with radial grooves, are provided—one attached to the frame and one qttached to a lever which carries the axle. The disc attached to the lever is mounted on a pivot pin. Between these metal discs is a disc of rubber which is formed with projections which engage in the grooves in the metal discs. So far the arrangement resembles the wellknown drive for magnetos where rubber engages in grooves in metal discs.

In the present invention, however, the spring is obtained by the distortion of the rubber as the axle rises and falls. The rubber is in the form of a ring, and does not extend to the centre of the discs. A Lady's Design for a Dust Cart.

HENRIETTE BOURSIER, of Paris, in specification No.245,771, shows a design for the body of a vehicle to collect house refuse.

A platform is provided to receive a bin of refuse, as shown, in dotted lines. This platform is hinged so that it can be

tipped into the body of the vehicle as shown in full lines. A flap is provided which automatically opens to receive the bin, and closes after it is removed.

Special bins are described with lids which open automatically as the contents are discharged; the bins have flanges which engage slides provided for them in the platform. By these means no dust is allowed to escape. The body can be tipped to discharge its contents in the usual manner. A hole is provided for a rake to distribute the load evenly.

A Free Wheel in a Gearbox.

GEORGE GRIFFIN, of New Jersey, U.S.A., in his specification No. 255,150, says that much power is wasted when vehicles run downhill, or under any other cir

cumstance where no power is required to drive them. 1, He is evidently taking the push-cycle for his model, and, finding that a lot of ground can be covered in a day witig. out exertion on the part of the rider, thinks that the same principle may apply to motor vehicles.

It is a well-known fact that with a lorry the amount of petrol necessary to drive it over a given distance on a hilly road is practically the same as on a level road, provided the driver takes full advantage of all descents by shutting off his engine and holding the clutch out. Many drivers, however, do not do this, and it is to make this saving automatic that is the object of the present invention.

A free wheel is provided, which only comes into operation whe'n the two shafts—the driving and driven—are connected, as in top gear.

Many inventors describe the free wheel as being part of their plans, as if such a device were well known to be practicable when applied to a motor vehicle; but, in reality, there is very little evidence that this is the ease.


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