AN INGENIOUS CARBURETTER.
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A Résumé of Recently Published,
Patents.
THE "JET" in the carburetter, which is described in specification No. 197,825 by G. Soulage, is really a circumferential gap in the ways of the .choke tube, this gap occurring, of course, at the narrowest part of the tube._ The gap itself is very narrow, and must be :measured; in fact, according to the inventor, in hundredths of a millimetre.
Moreover, the passage leading to it, which is the space between two conical surfaces, which are parallel, maintains the same minute dimensions as those already named in connection with the " jet." The choke tube is in two parts, and this passage, and the jet, is the division between the two. Its width is made adjustable by the simple expediene of screwing the upper part of the choke tube into the body of the carburetter, using a fine thread of slow pitch. When the necessary adjustment has been effected, the movable portion of the choke tube is locked in place by meansof a set-screw,
A. flatiropped, pear-shaped valve is located in the choke tube, and it is de
signed to be 'lifted or lowered in that tube by means of suitable mechanism, which may be operated by the. driver.
The larger part of this valve is on top and immediately below the head a groove is cut round its whole circum ference. At its lowest position this valve is closed, or, strictly speaking, disposed to afford a suitable mixture foe slow running. In that position the groove or channel which has already been mentioned is immediately opposite the "jet," where it serves as an eapansion chamber, wherein, we are told, the fuel is instantly vaporized.
The speed of the engine is not necessarily controlled by the operation of this valve. The carburetter may be adjusted to work with it set in position once and for all, and the speed of the engine. varied by means of a separate throttle valve of any desired type. It is further claimed that the centripetal flow imparted to the liquid final, in the narrow passage along which it must pass on its way to the " jet " automatically brakes the fuel at high speed be cause of the converging motion imparted to the molecules of the liquid. The working of the carburetter is thus ren
dered automatic, as the amount of fuel delivered is reduced in proportion to the increase in the speed of the engine.
Other Patents of Interest.
Specification No. 197,734, by R. F. Carey, describes an ingenious hydraulic clutch, the principal novelty in which appears to be the use. of balls as pump plungers. The *hole of the mehanism is contained within an oil-tight casing. The main component is a rotor, mounted close to the end of the engine shaft and revolving on the driven shaft, .which is hollow and provided with a number of ports or passages between its interior and exterior surfaces. The rotor, which is carried round by the engine flywheel, has a number of radial-bored holes, in which the balls to which we have already referred may reciprocate. Round it is an eccentric race or pathway, with which the balls are kept in 'Conta.ct by the effect of centrifugal force. When the oil Within the casing is free to pass to and fro between the interior of the rotor and the easing itself, these balls are free to reciprocate and the rotor may revolve without any motion being transmitted to
the driven shaft. This corresponds to a free-engine position. When the passage between rotor and casing is entirely Closed, then the balls cannot reciprocate; they cannot, therefore, accommodate themselves to the eccentric path by which they are circumscribed-, ancle'ciansequently, carry that path round with them. As it. is coupled to the driven shaft, it follows that, apart from slight slipping occasioned by leakage, the transmission is a direct one between engine shaft and driven shaft. Slipping of the clutch and intermediate speeds between this direct top and the free-engine position are afforded by graduated opening of the passage between the rotor and casing. .
"Specification No. 197,817, by S. Hough, relates to what appears to be a very use
ul invention ; it provides means for the replenishment of grease cups without here being any need to remove the caps of those cups. At the bottom of the cup a transverse passage is provided, which -communicates with the interior of the
cup. Normally, this passage is closed by • means of a spring-controlled plunger. Tn• eertion of the nozzle of a grease gun displaces the plunger and allows the grease cup to be replenished through the communicating passage.
• Specification No. 197,720, by G. P. Fawcett and International Motors, Ltd., relates to the driving and control mechanism for a motor road sweeper. The invention is concerned with a quick -raising and lowering of the brush.
An improvement in disc or plate e clutches is described by Sydney Smith and A.-C. Cars, -Ltd., in specification No. 197,816. The driven disc it; slotted and slit so that a number of tongues is formed of its material, near its circumference. The tongues are bent out from the plane of the disc, and they are preferably arranged in pairs, so that of each pair one tongue may be bent to one side of the disc and the other to the opposite side. The direction in which the slits are cut is necessarily each that the. driving discs, in rubbing, reach the root of each tongue before they touch the tip.
A method of compelling. circulation of the cooling water in a radiator is deeeribed in snecificatinn No. 197,716, by A. Abbott.
The transmission • gear Whieh is described in specificatiou No. 197,715, by El. Dolton, takes the form of glorified beariees, the inner race being the driving shaft, the. balls and their cages being coupled to the driven sheet, and the outer race being stationary. Both inner and outer races are split vertically, and the control gear operates to eeparate the portions of ..he inner race and to close those of the outer race, or vice versa. thus altering the radius at which the halls work and varying the transmission ratio accordingly'.
_ A novel method of regulating the heating of a carburetter ie described in specification No. 197,827, by E. Dodson. The water for the purpose is passed along the pipe whiek is disposed inside the exhaust manifold.
J. Robertson describes his patent., which is discussed in specification No. 197,571. as "Advertising. on Road Vehicles." The rather ingenious device to which he refers is applicable most conveniently to those light vans which have two oval windows at the rear of the vehicle. Inside the van, in front of each window, he hangs a card, on which is painted the iris and pupil of an eye.. The cards are retained in a vertical position by means of weights, but as the vehicle is in motion, the cards will naturally swing from side to side, giving the observer the impression that, the eyes are moving. '
Something n little out of the ordinary run of friction-gear transmissions is embodied in the contrivance which is described in specification No. 197,580, by A. Roembeke.