With Intent to Improve.
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A Weekly Summary of Recent Patents, of Interest to the Maker and User of Commercial Motor Vehicles,
Selected and Abridged by H. S. Hall, A.M.I.A.E.
Babbit4ined Aluminium.
Clement Talbot, Ltd. and P. E. Knell, of Barlby Road, Ltdbroke Grove, London, W., have discovered a means of treating aluminium bearings for the re ception of white metal, linings. This they have patented, and the description is now made public in specification No. 105,971.
The process is a simple one. The aluminium casting which is to be lined is first of all heated, and whilst hot thoroughly cleaned, preferably , by some abrasive process,. ,such, for example, as filing: Whilst still hot, a stick of aluminium solder of the following composition is rubbed over it :—Tin, 81 per cent; zinc, 14,58 per tent; aluminium, 3.64 per cent. ; commercial phosphor tin, .78 per cent:
The bearing can then be allowed to cool, prior to mounting in it place beneath the shaft, when the white metal can be run in in the same manner as is customary when providing white metal to any bearing.
The patent also covers treatment of aluminium in a similar manner as a prenautionary measure, preventing corro
sion. . . • . There are four claims which cover very fully the application of this 'process.
A Simple Adjustable Spanner.
H. Sayer and C. F. Carr, df Chaucer Works, Clough Road,-Sheffield, describe in specification No. 106,065 a new design of adjustable spanner or wrench.
This is in two parts, as our illustration shows, one Part carrying a fulcrum pin having an elliptical head, the 'ether being provided with a number of hales so disposed that it is possible to couple the two portions of the spanner by means of this pin in such a manner that they will not come apart while the tool is actually in use, and so that a ready adjustment of the distance between the jaws, by separating and re-joining the parts, is possible.
The principal claim for this spanner is its simplicity and the Jack of wearing parts. The claim covers an adjustable spanner, pipe .wrencb, pipe cutter, etc., in which a number of elliptical holes are formed in one member „for the reception of a special pin in the other so as to permit the capacity of the jaws to be increased or diminished as acquired.
A Carburetter From New Zealand
A new type of carburetter corning from "Down Under" is described in specification No. 102,043, by the patentee, E. R. Codward, of 40,• Dewling Street,' Dunedin, New Zealand, and is of that type in which the fuel is drawn through and from absorbent material. after issuing from a jet in the ordinary way. We reproduce a couple of illustrations, these being made from drawings which accompany the specification.
Petrol enters, as may he seen, from a normal type of float chamber and arises through a centrally-disposed jet, issuing therefrom into the centre of a tall, gauze nozzle. Surrounding the jet is a tube, which tube is covered with absorbent gauze material both on the inside and on the outside. A conical coil spring referbnce should here be had to the drawing—is disposed Within this tube Bo that its lower end grips the top of the jet, and its upper and wide end is a sliding fit in the tube: -When at rest, the coils of this, spring are in contact with one another. Surrounding the tube is a cylinder, open at its lower end and
closed at the top, the top being the form of an inverted cone, the apex of which enters the choke tube, as we must, for the avant of sa Petter word, call the inner, tube which immediately surrounds the jet. This cylinder is free to rise and fall under the influence' of engine suction, and is covered on• both its inner and outer surface by an absorbent materiel, Normally it comes to rest with the. bottom or open end in contact with the base of the carburetter. This is the closed position, and the carbu-retter is so shown in the left-hand figure of the drawing which we reproduce.
The cylinder is maintained in its position concentric with the jet and choke tube by means of light springs. It is surrounded by still another cylinder of absorbent material, the top of which serves to prevent "blow-back " from the combustion chamber,. which might set' the petrol which is in the carburetter on fire. This outer cylinder of absorbent material' is enclosed within the main body of the Carburetter itself. Engine suction has the effect of lifting the inner cylinder as shown in the right7 hand figure. Air is drawn past the jet, and past the suction-opened coils of the conical spring we have mentioned. It
passes thence up the choke tube, down the inside inner cylinder, and up the outside of the inner cylinder, being at the iame time in contact with the inner surface of the outer cylinder. During all this time it is absorbing fuel from the absorbent linings of the various cylinders.
It is claimed that this carburetter is designed to overcome known difficulties of carburation in connection with petrol, which nowadays always comprises several, spirits of different degrees of volatility. The effect of the arrange. tuent just described is that the light and more volatile hydrocarbons are Immediately absorbed by the air as it enters and they travel with the air through the tubular chambers containing the gauze. Only-.a certain quantity of 'petrol is absorbed by this process, and if the supply of petrol is greater than can be absorbed, the heavier or less volatile hydrocarbons are caught by the fine gauze and held thereby for later use. Owing to the design of this carburetter, inasmuch as the outer tube of the chamber has a greater diameter than. the induction pipe,. the speed of passage of the mixture through the outer tube is considerably reduced, thus allowing time for the heavier hydrocarbons to be absorbed when needful, and it is stated that as a result of the use of this carburetter, the mixture is more uniform and homogeneous than is customary.
The principal claim is for a carburetter incorporating a chamber lined throughout with absorbent material and expanding, in rtrapect of the area of its passage ways, from its inlet to the engine induction pipe and into which chamber all the air and petrol enter together through one opening.