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Self:energized Disc Brakes

31st October 1958
Page 62
Page 62, 31st October 1958 — Self:energized Disc Brakes
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Which of the following most accurately describes the problem?

Tmake a brake self-energizing is t?elatively simple with drum mechanisms, but to apply the same principle to a disc brake is more difficult The best scheme up to now is to use a rolling ball on a ramp, but this has been found to present production problems. This is stated in patent No. 800,110 which describes an improvement to these devices. (Bendix Aviation Corp., South Bend, Indiana, U.S.A.)

Though referred to as a disc, the rotor in this scheme is of channel section, the friction mechanism being housed inside the channel and expanding on to its ; walls. The drawing shows the layout of the friction device. Actuation is initiated by spreading the two pads (1). These bring the arcuate friction-faced shoes (2) into contact with the moving sides of the channel (not shown). The shoes tend to move with the channel, and in doing so they turn a pair of back-to-back cams (3) which earry pins (4) acting as onetooth gears. As the cams turn, their overall width is increased, and it is this that *applies the amplifiedspreading, force to the shoes.

A LOADING DEVICE

• A SELF-LOADING mechanism -for I—I lorries is the subject of patent. No. 800,075. Powered hydraulically, the lifting gear not only raises the load but will also carry it forward along -the body if required. (Market Transport, Ltd., and R. Tapp, both of 166 Weir Road, London, S.W.12.)

The drawing illustrates -the general layout. The vehicle is provided with a pair of rails, one at each side, to form a track for a wheeled trolley (I). Upon this is pivoted a jib (2) of inverted U-shape. This can be swung to about 15 degrees below horizontal to pick up a load on the ground.

A hydraulic cylinder (3) provides the lifting force, and is coupled to a flexible

hose (4) which is wound on a reel in the driver's cab. The load, once having been lifted, can be swung to the jib position shown at 5, and the assembly can then be wound along the rails by a hand-winch until it reaches the desired point, where it is lowered to the floor.

Other schemes are shown, one having an upstanding toiver for the jib, and another in which the jib can be stewed sideways.

A BODY FOR STACKED LOADS A BODY designed for stacked loads is described-in patent No. 800,094_ The description refers to the load as " drums " but thiC term does not imply any limitation as to the purpose of the body. (Metal Containers, Ltd., 17 Waterloo Place. London, S.VV.1.) The principle employed is to use a descending roof that, when lowered on to a load of drums, clamps them firmly. The drawing shows one way of doing it. The drums, indicated at 1, are stacked in tiers, and preferably a layer of felt or other soft packing is placed between each tier.

The roof is attached to end structures, as shown generally at 2, and these can be wound up or down by lead-screws (3). The screws are turned manually and worked-through bevel boxes (4). A shaft runs the length of the body to operate both back and front screws in unison.

Rods (5), telescoping into tubes (6), provide vertical guidance. The underside of the roof may be faced with a layer of sponge rubber where it meets the load, whilst the miter surface is weatherproofed by aluminium sheets.

ROAD RAIL TRANSFER SCHEME

AN integrated road-rail transport system is suggested in patent No. 799,736 which shows a scheme employing containers fitted with wheeLs of the same gauge as the railway wagons. They are hauled off the rail trucks on to rails, and then pulled aboard a lorry. (A. Kinsey, 120 Pack Horse Road, Melbourne, Derby.)

The drawing illustrates the second part of the operation The lorry has been backed into a well below rail level, and the container is attached to it by a coupling chain (0. Two side walls are provided with rollers (2) and the con ainer travels along these after it has left the rails (3). As the lorry is driven away it rises under the container and finally ifts it clear of the rollers.

A similar scheme is used to load the containers on the railway trucks; in this case the truck is down a well.

TUBELESS TYRE AND RIM • ASSEMBLY INSTEAD of carrying a complete spare wheel, a tubeless tyre is mounted on a small, light rim; this is used as a spare for fitting to the existing wheels. The patent comes from The Firestone Tire and Rubber Company, Akron, Ohio,

A SELF-SERVO BRAKE MECHANISM PATENT No. 800,217 describes an improved self-servo brake system. (K. and J. -Eckhardt, the former of Schwartze-Strasse 17, Leipzig, Germany.) In the layout shown in the drawing,, hree of the four wheel-brakes are energized by One hydraulic cylinder (1). The fourth brake, on the off-side rear wheel, .has two sets of shoe mechanism. One of these (2) is the initiator of the action and is applied by the pedal (3) via a hydraulic system. When this brake is applied, it is free toturn with its drum, and this provides the servo action. The brake moves a lever (4) which in turn operates the main hydraulic cylinder.

The other half of this brake consists of a pair of shoes (5) which are worked by another hydraulic unit (6). A compensating beam (7) couples the two systems to ensure uniformity of application. An anti-skid device is incorporated.

DUAL-CLUTCH TRANSMISSION

FROM S. Smith and Sons (England), Ltd., Cricklewood, London, N.W.2, comes patent No. 796.956. This deals with a five-speed and reverse epicyclic gearbox having two clutches. These can be selectively engaged in conjunction with the brake bands Controlling the epicyclic mechanism.

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