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Weight Transference by Drawbar A Résumé of Recently Published Patent

12th August 1938, Page 54
12th August 1938
Page 54
Page 54, 12th August 1938 — Weight Transference by Drawbar A Résumé of Recently Published Patent
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Specifications That are Obtainable from the Patent Office, Price is. Each ATRAILER coupling device, by which tractive effort between the vehicles is converted into a downward pressure on the rear of the tractor, is the subject of patent No. 487,895, which comes from Multiwheelers (Commercial Vehicles), Ltd., and others, all of Green Lane Works, South Harrow,

Middlesex. .

The transforming of the tractive effort is effected by hydraulic apparatus carried on the trailer, the drawbar (4) of which is pivoted about a fixed spindle (8). The drawbar is slidably mounted at a point (7) on the outside of an hydraulic cylinder (I), the piston of which slides with the drawbar when tractive effort is applied.

The oil contained in the cylinder, when under load, is forced out of the right-hand space (2), along the hollow piston rod and past a control valve (5), and finally reaches a vertical hydraulic cylinder. Its piston is attached to a pin and roller (3), so that a down'ward force is applied to the drawbar and is transmitted to the rear of the tractor. lily this means the drivingwheel adhesion is varied in accordance with the pull of the tractor.

THti E latest German practice in oilengine design is shown in patents Nos. 487,454 and 487,484, both of

which originate from Auto-Union A.G., Scheffelstrasse 110, Chemnitz. The object of both schemes is to provide a combustion system that will operate on *36 low-grade fuels, including some not normally considered ignitable. Another advantage claimed is the low quantity of excess air required.

As will be seen from the drawings, in both cases a precombustion chamber is used, the schemes differing only in the air-control arrangements. Patent No. 487,454 employs an air cell of toroidal outline ; this may be located either in the piston crown (as shown) or in the cylinder head. The precombustion chamber is formed as an extension of the injector nozzle, and is provided with apertures in the conical nose, which direct a flaming rich mixture into the air cell, as shown by the arrows.

The other patent. No. 487,484, shows a design in which the precombustion chamber (1) and the air cell (3) are formed in the cylinder casting, the injector being screwed in as usual. Note the hollow plug (2) ; this connects the two spaces, and acts as a heat-conserving device by virtue of a thin flange spaced away from the surrounding water-cooled walls. Electric Deflating-tyre Indicator.

ilANY devices have been proposed alfor giving warning of a partially deflated tyre, but these are generally of too complex a nature to warrant general use. A simple but effective device for this purpose is shown in patent No. 488,069, from D. Hogg, 22, Am bergate Road, Liverpool.

This inventor proposes to mount on each axle a pair of sloping glass tubes (1) protected by a wooden casing. Each tube contains a small globule of mercury (2), which on the level occupies the position shown. Should a tyre slacken, the axle would be slightly tilted, and the mercury On one side would run down the tube and make contact across a pair of wires connected in a warning-lamp circuit.

It might be objected that road camber would falsely work the warning, but an intelligent driver would soon learn to allow for abnormalities.

Safety Lock for Overdrive Gears.

FROM Albion Motors, Ltd., and J. Kemp, both of South Street, Glasgow, comes patent No. 487,504, describing a safety device for use with auxiliary gearboxes of the overdrive type. These devices can be of light construction if it can be ensured that, when the overdrive is used, no ratio other than top gear is engaged in the main gearbox, and the patent is concerned with a scheme for ensuring this.

The drawing shows part of the auxiliary gearbox; in this the gears are engaged in the usual manner by sliding a notched rod (4). To prevent operation at the' wrong moment, another sliding rod (1) gearbox, and is provided with a notch (3), which has to be moved over the plunger (2) before any movement is possible in the auxiliary gearbox. The parts are so arranged that this free position occurs only when the main gearbox is in top gear. By this means the overdrive is relieved of heavy loading. the main from extends

Tags

Organisations: Patent Office
People: D. Hogg
Locations: Liverpool, Glasgow

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