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AN ENGINE WITH FLAT SLIDE VALVES.

2nd March 1926, Page 28
2nd March 1926
Page 28
Page 28, 2nd March 1926 — AN ENGINE WITH FLAT SLIDE VALVES.
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A Résumé of Recently Published Patent Specifications.

MkERCIE RILEY, in his specification No. 246,287, sh'ows

a very interesting development of the slide-valve. engine. The inventor claims that such an engine is inexpensive to manufacture, silent and efficient in operation, and that it Provides large ports. As will be seen from the two views, the head is of the detachable type, and its under surface is merely flat, which can be resurfaced by any mechanic, whilst the plates which form the valves can be treated in the same manner when worn. The upper end of the cylinder is enlarged to receive a junk ring which is fitted with rings similar to those on the piston, and is forced upwards by means of springs, in this way forming a gas-tight seal. A shaft runs through the engine casting, which does the duty of the ordinary camshaft. The movement of the sliding valve plates being effected by eccentrics and without springs, there should be no noise due to the reaction of springs, as with the cam and tappet.

Large ports are provided, one for inlet and one for exhaust, in the cylinder head. The crescent-shaped valve openings are arranged so that they are outside the radius of the cylinder bore. By this means they are not, to any great extent affected by the pressure in the cylinder, as the large oval and round holes provided in them relieve them from pressure to a great extent. We shall be interested to hear more of this very promising type of engine.

A Rotary-valve Engine.

ALEXANDER BELDDIANO, a Roumanian, resident in Naples, describes, in specification No. 244,327, what is claimed to be an improvement in engines which are fitted with rotary perforated valves for inlet and' exhaust. So far as concerns the use of a rotary valve driven by means of a Worm gear and provided with perforations which govern the inlet and exhaust openings, there is nothing novel in the arrangement, which the inventor admits. The point which he claims to be an improvement is the cupping of the under side of the valve in connection with a, cupped piston.

A Much-needed Safety Device.

AN automatic cut-off for the vent of petrol tanks is shown in the specification of P. G. Phillips, No. 246,227. The plug shown is intended to be fitted in the top of a petrol tank as a vent. The sleeve which surrounds the ball vale is interrupted so as to permit the passage of air, hut to prevent the ball,,from falling out. A pendant lever with a weighted end hangs from the device and is supported by a packing ring which makes a petrol-tight joint. In ease of J344

an accident which might result in the vehicle being overturned on its side, the weighted lever will cause the ball to close the vent, and by so doing prevent the escape of petrol and avoid the consequent risk of fire.

We have on more than one occasion seen a vehicle lying on its side, and petrol flowing from the vent, which might have caused a serious fire, and one such accident was reported last year. It would seem that this simple device would effectually prevent such a risk, and we -would advise licensing authorities to investigate this safeguard. It is curious that the specification only 'mentions the application of the device to the vent and not to the pipe leading to the carburetter. It would seem that with some modification the device might be rendered equally applicable to this pipe.

A Brake Invention.

IN specification No. 246,223 A. H-€1. Girling describes a brake in which shoes of the ordinary form are employed, but do not actually contact with the drum in which they work. Contact is made by means of a ring, or segments of a ring, which can slide on the shoes when the latter come in contact with the drum. As shown in the left-hand view, the flexible ring can follow the revolving drum in either direction until it is arrested by the shoulder formed on the shoe. As shown in the right-hand view, the band is arrested by either of the abutments shown, which are fixed to the Plate which carries the • expander cam and the fulcrum pin. This arrangement is said to give a servo or self-energizing effect.

As no floating of the fulcrum pin is mentioned, it is not very clear how the band can make contact fully with the brake drum any more than with the ordinary arrangement.

Improvements in Ignition.

THE Schiffswerft Linz Aktiengesellschaft of Austria, in

specification No. 238,118, describe a device for heating the air in the neighbourhood of a discharge of fuel into a.cylinder so as to facilitate the combustion of fuels of high flash point. As the fuel leaves the nozzle from which it is discharged it assumes the form of a cone; and it is on the outer part of this cone that the finer particles of the discharged fuel will always be found. The inventor places a sparking plug in a position which will enable it to heat and ignite the finer particles of the fuel.

It is not, 'however, very clear whether this device is intended for use with ordinary engines as used on automobiles, or whether it is for the Diesel type of engine alone.

A New Carburetter.

THE Studiengesellschaft fur Hockdruck-Explosionsmoteren, of Schwerin-Gorries, Germany, in specification No. 223,609, describe a carburetter which they claim is useful for heavy or low-grade fuels. The main point of the invention appears to be the introduction of air in small quantities to the fuel before it reaches the spraying jet.

The sectional view shows the passage of the fuel, which enters at the bottom and travels upwards through the regulating groove, where it is mixed with a small quantity of air which enters through the primary air inlet. It then passes to the chamber

223.609 where secondary air is introduced, and then on to the spraying jet. A sliding sleeve is shown which is controlled by means of the cam shown on the right. The regulating groeve, being tapered, can regulate the fuel and secondary air admitted.

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Locations: Naples, Schwerin-Gorries

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