A DEVICE FOR MIXING EXTRA AIR.
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A Résumé of Recently Published Patent Specifications.
riONSTANTINO CRIARA and Mrs. kJLina Criara, both Greek subjects, in specification No. 245,153, show a device for introducing extra air into an induction pipe and, at the same time, mixing it with the mixture drawn from the car
buretter. Another feature of the invention is a means for the automatic regulation of the amount of extra air drawn in.
The device consists of a chamber which is fixed above the ordinary carburetter and communicates with the induction pipe. This chamber is provided with a horizontal cylinder, which is shown in section -in the lower view, and has a valve sliding through it which is regulated by a pair of springs, each of which is adjustable by means of screw plugs, one of these is provided with holes. through which the air can enter, as indicated by arrows. The valve is so arranged that, should the suction be more than normal, as when the throttle is nearly closed, the valve will be drawn towards its seating, and so prevent extra air from entering. A ring is formed around the chamber so that the extra air can enter on all sides, as is indicated by arrows.
Above the holes through which the air enters the chamber is a double-bladed propeller which is caused to revolve by the inrushing air, and so ensures a thorough mixing of the extra air with the product of the 'carburetter. A brake, which consists of a nut which can exert pressure on the thrust ball bearing and so regulate the speed at which fan can revolve, is provided on the spindle of the fan.
The Ventilation of Omnibuses.
IN their specification No. 264,007, G. D. Peters and Co., Ltd., and EL. A. Chattaway, of Windsor Works, Stough, show a means for ventilating omnibuses and other passenger-carrying vehicles. An aperture in the roof communicates with a structure above the roof which, owing to the forward movement of the car, forms an air extractor, as shown by arrows on the right of the illustration, the contraction of the aperture increasing the speed of the incoming air.
So far we think we have seen something resembling this, but one feature appears to be novel. It will be seen that the partition at the rear of. the funnel leading from the interior is interrupted, one wall overlapping the other. This is to prevent any moisture, such as rain, that might be drawn in, from entering the vehicle, as moisture trickling down the rear screen would be caught by this interruption.
Automatic Brake Adjustment.
THE Societe Nouvelle des Etablisse ments Deeauville Aine, of Paris, in specification No. 252,023, describes an arrangement of brake connections which automatically adjusts itself for wear in the shoes and drums. The specification does not particularly refer to automobiles, but the subject seems of sufficient interest to those who have to do with the commercial motor industry to warrant our describing the invention.
The drawings show a push-rod connecting a pressure cylinder, shown on the left, with a brake arm shown on the right. It will be seen that the screw in this rod, if rotated in one direction, will have the effect of lengthening the rod and by so doing compensate for any wear that may have taken place in the shoes. The nut which acts as the adjusting member is free to revolve on its screw without taking with it the bell-shaped member which abuts against the plunger of the pressure cylinder. Grooves are cut on the periphery of the nut, which resemble the teeth on a helical pinion. These grooves are engaged by a pawl which is controlled by a spring, and is capable of a limited movement only, a stop being provided, as shown in both views.
When the brake is applied the pawl can move as indicated by full and dotted lines in the right-hand view, so that it can follow the helical grooves without imparting rotary movement to the nut, so long as the travel of the nut does not allow the pawl to come free of the helical grooves, but when, through wear, the travel of the push rod becomes such that the pawl leaves the teeth of the nut on the stroke which applies the brake, the spring will assert itself, and the pawl, being freed from the teeth, will spring back and, on the return of the pinion to the brake-off position, a slight rotary movement will have been imparted to the nut, which will be sufficient to adjust the push-rod and so take up wear.
A Magneto to Give More Than One Spark Per Revolution.
THE British Lighting and Ignition Co., Ltd., in specification No. 263,286, describes a magneto of the type in which there are a fixed armature and a rotary magnet. The special feature of the invention appears to lie in the fact that with the arrangement described two or more'rmagnets may be mounted eccentrically around the axis.
The drawing shows one application of the invention, the left-hand view being a section raid-way along the length of the magnets, the centre piece being the axle, around which are four round bar magnets and their four-pole shoe faces.
The upper right-hand view is a section on the line AA, and shows a magnet and its fork-shaped member terminating in .a pole shoo. The lower right-hand view is an external view of the arrangment. The magnets are magnetically connected with the fork-shaped members, each of which comprises a pole end piece carrying two tongue-shaped pole shoes which extend towards the centre of the rotor, the faces of the pole shoes being arranged parallel with the shaft and concentric with the stationary armature pole shoes, between which and the faces of the pole shoes on the rotor there is the usual gap. The pole shoes connected with each pole end piece may be secured together for a portion of their length by a cylindrical portion, as shown in dotted lines in the lower righthand view.