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A Spring Without Shackles

30th May 1947, Page 52
30th May 1947
Page 52
Page 52, 30th May 1947 — A Spring Without Shackles
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Which of the following most accurately describes the problem?

THE usual shackle pin is one of the most heavily loaded parts on a vehicle, and unless the lubrication be perfect, play will soon develop. A spring in which shackles are unnecessary is shown in patent No. 585,984, by W. Herbert, and Carrimore Six-Wheelers Ltd., both of Great North Road, London, N.12.

The longest three leaves are bent over to form return loops (1) and then firmly clamped to the chassis. The three loops are slightly spaced from each other, so that they are free to vary their effective length with a changing load. Abutment faces (2) are provided to fix the position with certainty.

Not only does the scheme abolish the need for lubrication, but production is said to be cheaper. The patent also covers the use of the spring in a transverse position, with the loops attached to the axle ends and the midpoint to the frame.

A TOOL FOR GRINDING OVERHEAD VALVES

./-1 A WORKSHOP tool is shown in patent No. 584,144, by A. Porter, The Red House, Plymstock, near Plymouth, its object being to facilitate the

grinding-in of overhead valves. The novelty rests on the grasping of the valve by its stem, instead of its head.

In the drawing, 1 is the valve stem and 2 the usual split-collar assembly. The tool is provided with a U-shaped slot to embrace these parts, and they are then held in position by a screwed spindle (3), A locking nut (4) is provided to prevent unscrewing. The valve is oscillated in the usual manner, except that the operator pulls it towards him instead of loading it in a downwards direction. This is claimed to be less tiring than the usual method.

OH, ENGINE COMBUSTION SYSTEM ALIQUID-1NJECTION system for oil engines is disclosed in patent No. 585,801, by A. Liengme, St. Gallen, Switzerland. The stated object is to

improve the turbulence by providing several fuel jets.

A sectioned cylinder head is shown in the drawing, I being the combustion chamber, which is sunk in the piston crown in a position slightly offset from the centre. The valve seatings (2) are arranged so that both of them slightly overlap the rim of the combustion chamber.

The nose of the injector is slightly eccentric in relation to the chamber, and the fuel is sprayed in three divergent streams, one (3) being directed across the chamber, whilst the other two are almost at right angles to the nozzle axis. The exhaust port (4) is inclined away from the injector to,minimize the transmission of heat.

USING A TRACTOR FOR LOADING VEHICLES

PATENT No. 585,161 shows an attachment to enable a tractor to be used for loading lorries with manure or other loose material. The patentees are G. and D. Jones, Esmo House, Rhosemor, Mold, Flint.

The tractor is fitted with a jib (1), which carries a travelling scoop (2) powered by a cable attached to a drum (3). The drum is driven from the power take-off of the tractor and is controlled by a clutth. By driving the tractor into a manure heap, and then raising

the scoop, the material can quickly be elevated for discharging into a vehicle. The scoop can be caused to tip by releasing a detent operated by pulling a cord (4).

A SELF-LOADING LORRY

A COMBINATION of lorry ana I—tmechanical navvy is shown in patent No. 585,897, which comes from R. Frost, Fresno, California, U.S A., and others.

The chief feature is a pair of rigid arms (1) fitted with a scoop, and capable of swinging from the ground ahead to a position well over the body. The motive unit is a hydraulic cylinder (2) mounted inside the frame, and connected to a crankshaft (3) to which the arms are attached.

To assist the ram when the angle is unfavourable, a second vertical cylinder (4) is provided; this has a short stroke and gives only an initial boost to the crankshaft. A pair of shock-absorbers (5) is used to cushion the descending arms.

To protect the top of the cab from falling debris, the body is fitted with a forwardly projecting hood (6). When the body is tipped, material on the hood is automatically emptied into the body.

A NEW ALLOY FOR PISTONS

HIGH working temperatures of modern engines call for piston alloys possessing "hot strength," and an alloy claimed to fulfil this requirement is disclosed in patent No. 585,610, by T. Bradbury, 57, Windley Crescent, Darley Abbey, Derby.

A typical example of the alloy is aluminium, plus magnesium 6.25 per cent., nickel 1.4 per cent. and manganese 1.1 per cent. It is important that the total of the iron-silicon impurities be kept below 0.7 per cent. A test bar of the new alloy was tested at 350 degrees C. and found to possess a yield stress of 5.03 tons per sq. in., whereas a bar of the well-known Y alloy under similar conditions showed only 1.98 tons per sq. in.

The patent gives several variations of the formula, all of which are stated to be usable up to a temperature of 425 degrees C.

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