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Another Independent Suspension System
Page 124
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judge by the number of patents on the subject, independent suspension systems are receiving much attention on the Continent. Patent No. 425,923 describes a new French design,the patentee being G. Broalhiet, 201, rue de Grenelle, Paris.
In the accompanying drawing, the steering pin (5) is bolted into the front axle, and carries a sleeve (2) to which is attached the steering arm and stub axle. This sleeve is capable of rotation for steering purposes, and an upand-down movement under the springing influence. The actual spring (3) iised is shown under the front axle.
connection being established to the wheel assembly by means of a shackle (4), pivoted on a ball-thrust race. The principal feature of the invention is the ball-race sleeves (1) which permit an up-and-down motion as well as steering movement. By this means, the inventor claims, friction is practically abolished.
Improvements in Spill-port Pumps.
PATENy No. 426,052, by the British Thoinson-liouston Co., Ltd., Crown House, Aldwych, London, W.C.2, and others, describes improvements in the port design of bypass or spill types of injection pump. The object of the invention is to give an increased rate of relief when uncovering the port, a considerable advantage when large amounts of fuel are being bypassed.
In the drawing, which shows only the essence of the scheme, the solid plunger has a helical control edge (2) operated in the conventional manner by angular rotation. Co-operating with this edge is a helical spill-port (1) terminating in a blind hole opposite the supply port (3). The spill-port is of the same pitch and hand as the edge on the plunger, so that the maximum port area is uncovered for a given movement of the plunger.
is.10 A Compensating Device for Brakes.
tiA SIMPLE compensating-lever assembly to be incorporated in a mechanical braking system is described by Ilendix, Ltd., Kings Road, Tyseley, Birmingham, in patent No. 425,478. The accompanying drawing
shows the essential mechanism, which, according to the specification, may be incorporated in a braking system in a number of ways.
Three elements are required, a pedalconnected lever (1), and two brakeoperating levers (2 and 4). The lever (1) has two projecting pins (3), each of which engages with one of the brake-operating levers, and transmits movement thereto. These levers are a close fit on the Central pivot (5), but the lever ( I ) has an elongated hole in its boss, so that a limited amount of sliding can occur, In operation, if the arms (2 and 4) offer equal resistance, the arm (1) remains midway on the pivot pin, but in the event of inequalities, it slides on its slot and effects a compensating movement.
In doing so it obviously takes up slack, or moves the shoes of one brake in advance of those in the other, until the resistance offered by the brake re -'quiring the greater movement becomes equal to that, of the brake applied by the other lever.
A French Bus-chassis Design.
DESCRIBED as being eminently suitable for bus service, an improved chassis is shown in patent No. 426,076 by Etablissements Laffly, of Billancourt, France. The principal improvement appears to consist in the division of the rear drive between two separate propeller shafts, one to each wheel, two bevel drives being, of course, provided. The object is to provide room for a central lowering of the body between the propeller shafts; these are placed substantially parallel with the frame members, The differential gear is located in the gearbox,and is illustrated diagrammatically in the drawing. -A further advantage claimed is that the dead rear axle may be shaped, if necessary, to suit road camber, particularly in the case of twin-tyred wheels.
The absence of differential gears from the rear axle, furthermore, removes a limiting factor in designing the crown wheels, and permits the use of a bearing behind the small bevel pinion.
Lengthening the Life of Pistons.
FROM Sheepbridge Stokes Centrifugal Castings Co., Ltd., and J. E. Hurst, both of Sheepbridge Works, Chesterfield, comes patent No. 425,C83, describing a modification in piston design, having the object of increasing durability. The invention consists in the provision of a hardened channelsection ring inserted in a wide groove in the piston, and can-ying the conventional ring within it. The drawing clearly shows the insert which is split and sprung over the piston, and afterwards pressed into its groove, a close fit being essential. This invention should remove the need for truing the grooves and fitting oversize rings.
The material is nitrogen-hardened steel or cast-iron, except in the case of an aluminium-alloy piston, for which austenitic iron or steel is to be preferred on account of its co-efficient of expansion more nearly approaching that of aluminium.