A Résumé of Patent Specifications that Have Recently Been Published
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air throttle (2) is shown in the air inlet pipe; this is an important feature, and serves to limit the comprengiOn at low speeds by restricting the air supply. The combustion chamber (4) contains the exhaust valve (3), the injector (1), and a sparking plug. In operation, the engine is started on petrol from an auxiliary carburetter (not shown), which is immediately replaced by fuel injection, but owing to the lowered compression caused by the air throttle, ignition has still to be performed by the sparking plug. This state continues until the throttle is opened to about 70 per cent, of full load, after which selfignition takes place. There are thus three stages _ of operation—petrol-starting, low-compression oil running with spark ignition and, finally, complete oil-engine operation.
Two-speed Linkage for Tipping Bodies.
DESIGNED to ease the maximum load on a tipping mechanism, a dual-ratio linkage forms the subject of patent No. 475,214 from W. C. Anthony, of Streator, Illinois,
U.S.A. In this design, an hydraulic cylinder expels its piston, thus moving a pivot (1) to the right. The pivot is attached to a free plate (6) provided with a cam-face (3) which can travel over a roller (5). Initial movement of the piston-rod imparts a clockwise rotation to plate 6, which, as it moves over roller 5, gives a slow-s xsed lift to the body,. via a compression member (2). After a certain movetnent, an abutment is reached, after which pivot 1 moves about a new centre (4), with consequent increase of speed.
Easy Starting of Oil Engines.
ANAME well-known in connection with oil-engine combustion systems is that of H. R. Ricardo, 21, Suffolk
• Stieet, London, SAVA., which appears in patent No 475,578, describing improvements in the regulation of injection pumps. The aim of the invention is to provide, for starting purposes, a special setting of the plunger which not only injects an extra quantity of fuel, but at the same time causes injection to occur at an earlier point in the plunger stroke, • The accompanying drawing shows n48
engthen the plunger, and, consequently, to increase the fuel charge, at the same time advancing the moment of injection.
Dual-expansion Piston Ring.
APISTON ring which expands in thickness as well as in diameter forms the subject of patent No. 475,622 from W. A, Oubridge, "Parklands," Park Road, Coventry. The aim is to ensure a perfect gas-tight fit in an endwise direction, in addition to the normal cylinder seal. The drawing shows a cross-section of piston and ring, the
Latter consisting of three pieces a pair of internally coned rings forced outwards by a spring-steel pressure ring. The conical surface divides the pressure into horizontal and vertical components, thus making an effective sea) in both directions.
Clearance is shown between the two internally coned rings, and this will obviously increase as the grooves wear, moreover the wearing of the grooves might be accelerated as a result of the movement permitted by this clearance. There should, however, be no reduction in the compression-retaining properties of the device because under the influence of downward pressure the faces will come into close contact.
Increasing Valve Durability.
THE high temperatures obtained with modern ethyl-charged petrols are inclined to cause pitting and burning of the valves, and to guard against this possibility is the object of the scheme described in patent No. 475,585 by Wilcox-Rich Corporation, 9771, French Road, Detroit, Michigan, USA. The method employed is to make a valve with a slightly undersize head and, after cleaning and pickling, to bring it up to size by immersion in a molten bath of Stellite, or some equally incorruptible alloy. In some cases, the patentee states, it may be necessary to give the valve a previous dipping in molten copper to act as a bonding material.
A Multi-fuel Carburetter.
MANY experinfents are proceeding in 1V1Germany with the object • of enabling engines to be run on unusual fuels, and •in patent No. 475,426 is described a multi-fuel carburetter for use in this respect. The patentee is A. Gennermann, Marsilstein 3, Cologne. The scheme comprises a multi-way rotary valve which can select one of a number of complete jet systems each connected to a separate Source of fuel. A common choke tube and induction system are used, and the purpose of the multi-way valve is to connect one of the fuel systems to the choke. A suction-operated servo-motor automatically selects a light fuel for starting, after which manual control is used. •