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• New Type of Rotary Valve

19th May 1944, Page 42
19th May 1944
Page 42
Page 42, 19th May 1944 — • New Type of Rotary Valve
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AROTARY valve which seats tightly in a conical bore when at rest, but which is lifted slightly to ease the bearing pressure when moved, forms the subject of patent No. 559,830, from E. Mellors, 2, Painswick Road, Birmingham, 28.

The drawing shows a pair of valves, one being the inlet, the other the exhaust. Both are ported so as to connect their respective passages with the cylinder when turned through a certain angle. T h e Valves tare pressed into their conical housings by springs(6) to main tain a• seal, but this

pressure is maintained only during the period

in which the valves are stationary. When about to be moved, a face-cam (3) rocks one of the levers (4), which then imparts a slight

lift to the valve spindle and thusrelieves the friction, of the cones.

The valves are actuated by an unusual type of mechanism, consisting of a. disc (2) fitted with pins projecting from its face ; these engage with -Slots in Maltese cross " discs (1 and 5) which impart successive rapid quarter-turns to the valves.

A single-cylindered engine, incorporating this type of valve gear, has already been tried out and, although somewhat noisy mechanically, shows considerable promise, FUEL INDUCTION CONTROL FOR A TWO-STROKE

THE interesting fact that Morris Motors, Ltd., is experimenting with two-stroke engines can be. gathered from patent No. 559,771, taken out by. this concern in conjunction with A. issigonis. Actually, the patent deals with only a single feature of the design, that is a means for preventing irregular running on small throttle openings. The cause of this, the patent states, is the low velocity 'of the mixture 'as it traverses the inlet port. At :high speeds the trouble does not arise, and it is the aim of the invention to provide a high-velocity gas flow with a small charge volume.

The drawing shows a section through the inlet ports (1) to a common pair of cylinders. rhe passage to the ports is controlled by a throttle (2) which is not the carburetter throttle, although it is linked thereto by a lost-motion coupling. For low-speed operation, it is proposed to employ special inlets (3) ; these, on account of their snrall diameter, maintain a high velocity with the small gas flow used for slow running. They are not throttle controlled, but are of course, primarily subject to the main throttle control of the carburetter.

A FRAMELESS TANK VEHICLE

ATANK-CARRYING vehicle of the semi-trailer type is shown in patent No. 559,933, by Thompson 13ros. (Button),' Ltd., and H. Thompson, both of Bradley Engineering Works, l3ilston. The objects of the design are to make full use of the available width, and to provide clearance space for the turn-table, without resorting to a dangerously high angle of slope.

The drawing shows the main outline _ of the tank, which is provided with a stepped portion at the front in order to gain turn-table clearance. The • tank 'is internally strengthened in the region of the step by the addition of vertical plates, as indicated in broken line.

The rear axle is attached directly to the tank but, to avoid wasting the available width, the usual strengthening rib or channel is disposed inside the tank instead of in the,usual exterior position. By this means, the 'actual storage capacity can be carried tO the maximum width of the vehicle.

COOLING SPARKING-PLUG POINTS

THE high dutydemanded from modern engines imposes the sparking plugs to high temperatures, and if pre-ignition is to be prevented, the points must be adequately cooled. An respect -forms the

improvement in this subject of patent No. 559,709, from C. Carington, W.

Sh o e.r t, and, K.L.G. Sparking Plugs, Ltd:, all of Robinhood Engineering Work s, London, S.W.15.

• Hitherto, t h e specification states; it. has been

thought necessary 'to keep the points as short and as thick as possible in order to provide a i,;oad conducting path for the heat, a different principle is, however, aaopted' by the 'patentees, whe. claim that small, light points are preferable, because they can be cooled on every working cycle' by the incoming charge of cool gas. To this end, it is, proposed to form a bell-mouth (1) at the end of the plug, so as to permit the maximum draught of gas over the points. A single central electrode is used, with two opposite earth points 'secured to projections (2) in the 'bell-mouth.

A BUILT-UP METAL SUBSTITUTE FOR TYRES

ARESILIENT wheel, which can be attached to a standard rim in place of a tyre, is shown in patent No. 559,875, by W. Smith, the Cottage, •Imper Court, East Molesey, Surrey. Referring to the 'drawing, the " tyre " consists of a series of bent .strips (2) welded to an outer rim (3), which may be fitted with a thin rubbers tread (4). The sloping sides of members 2 bear against the sides of ,a pair of_ springsteel discs (1 and 5), which are clamped by bolts on to the outside of a standard type of rim. When the weight of the load is applied, the wedge-shaped members are pressed upwards towards the wheel, springing out the sides of the discs (1 and 5) as they go. The design employs 20 wedge members attached to the Same ring (3).

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Organisations: •Imper Court
People: E. Mellors
Locations: Birmingham, Surrey, London

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