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A Powered Rear-Loading Shovel

23rd July 1954, Page 62
23rd July 1954
Page 62
Page 62, 23rd July 1954 — A Powered Rear-Loading Shovel
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Which of the following most accurately describes the problem?

A SELF-LOADING device for a lorry forms the subject of patent No. 710,217 (C. Frisk, 15 Malmbergsvligen, Giillivare, Sweden). The aim is to enable a vehicle to shovel its own load aboard and spread it evenly.

A pair of hydraulic rams (1) when powered, acts on linkage 2. This gives a primary rearward movement to the shovel (3) to thrust it into the heap of material.

Further movement of the rams then raises the shovel at an increasing speed. The power is automatically cut off Just before the top position (4) is reached and the shovel is arrested by rubber buffers (5). The sudden jerk hurls the load well forward into the body and so promotes uniform distribution.

RUBBER BUSHES FOR STEERINGPIN BEARINGS

PATENT No. 710,567, comes from Morris Motors, Ltd., Cowley, Oxford, and shows a novel scheme for utilizing rubber sleeves for the kingpins of a steering system. The aim is to abolish the need for lubrication and eliminate rattle caused by wear.

The drawing shows a cross-section of the proposed bearing in place round the swivel-pin (1). The housing is doubleconed and a pair of conical rubber sleeves (2 and 3) are inserted one from each end. The sleeves are provided with end flanges and can be pre-loaded by being comprgssed between a shoulder (4) on the pin and nut 5.

The steering rotation is accommodated by the twisting of the rubber sleevos and their untwisting provides a return-to-centre force which augments that obtained from the castor action. As described, the scheme is applied to independent suspension of the parallellink type.

KEEPING DUST OUT OF REAR. MOUNTED ENGINES

W/HEN an engine is mounted at the W rear of a vehicle it collects much dust and grit, probably due to the action of the road wheels. The aim of an arrangement shown in patent No. 710,588, is to exclude this foreign matter in a -simple way. The patentee is Daimler-Benz A.G., Stuttgart-Unterttirkheim, Germany.

The essence of the scheme is that the whole engine is contained in a casing that is closed off from the atmosphere as far as is practicable. As components such as exhaust pipes and transmission shafts must protrude, there are bound to be extensive leaks. To overcome these, the engine drives a blower which maintains a slight super-atmospheric pressure in the casing.

In one scheme, as illustrated, the casing is charged by a fan (1) which draws its air through a filter (2) and the radiator (3). Another scheme shows a special blower which, whilst maintaining the casing pressure, also gives a slight supercharge, due to the fact that the carburetter is inside the casing.

BENCH-TEST EQUIPMENT

DATENT No. 710,431 (Standard

Telephones and Cables, Ltd., 63 Aldwych, London, W.C.2), shows auxiliary electrical equipment for use with engines being bench tested. It provides a low-volt high-current d.c. supply for working the starter-motor, plus a normal supply for the ignition system. It is intended mainly for use in the repair shop.

THE DESIGN OF TANKS FOR VEHICLES

VJEHICLES used for the transport of V liquids in bulk, if fitted with cylindrical tanks, have a high centre of gravity. To lower this, elliptical tanks have been used, but these usually lack the rigidity of the cylindrical type and have a tendency to sag in the middle. A design in which an elliptical tank is

provided with reinforcement to prevent this is shown in patent No. 710,573 by La Soudure Autogene Francaise, 75 Quai d'Orsay, Paris.

It is proposed to use a flat elliptical section and to strengthen it with interior girders. The drawing shows a perspective view in which the zig-zag lattice girder is clearly visible. In addition, the tank itself is formed into a pair of main channel members (1 and 2) and the lattice girders mate with them. The sloping girders also form useful bases if it be desired to fit interior partitions to make separate compartments.

A VALVE-SPRING COMPRESSING A FOOT-OPERATED valve-spring I-1 compressing tool is shown in patent No. 710,702 (E. Arthur, The Elms, Rednal Road, Birmingham, 31).

The drawing shows the device adapted to deal with the springs of overheadvalves. The upper and lower bars (1 and 2) are slidably mounted on each other by a slotted joint (3). The ends of the bars are shaped to suit the valve and the spring-collar, and can be pulled towards one another to compress the spring.

The pulling is done by a Bowden cable (4) leading to a pedal on the ground. This, when worked by the operator's foot, leaves him with his hands free to deal with the collar and cotters.

The device can be adapted to compress the springs of side-valve engines. Another use for this valve-spring tool is as a clamp, the detachable gripping jaws being constructed according to the shape of the work piece to be held.


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