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A Vacuum-servo Brake Exhauster

13th October 1944
Page 36
Page 36, 13th October 1944 — A Vacuum-servo Brake Exhauster
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A Risume of Patent' Specifications That Have Recently Been Published

APUMP for use in connection with a servo-braking system forms the subject of patent No. 563,454, which comes from J. Rodway and Clayton Dewandre Co.,Ltd., both of Titanic Works, Lincoln. The pump is of the vaned-rotor type, and the improvement is directed towards lessening the effects of wear..

Referring to the drawing, the rotor (1) is eccentrically mounted in the barrel, and carries six sliding vanes. (2) which arc concentrically constrained by a pair of rings (3) mounted true in relation to the casing. Suction is produced at port :4 by the expanding spaces between the v.anes, the air being discharged from Port 5 into the atmosphere. A spring-loaded ball (6) acts as a suction-limiting-device. The end faces are sealed by fiat-faced discs which are spring-pressed against the edges of the vanes.

The essence of the invention lies in the mounting of the rings (3); hitherto these have been fixed, and it has been found that the vanes, as they pass over a port, tend to indent the rings at the same spot at every revolution. By permitting the rings to creep, this wear is evenly distributed and dents cannot he formed.


A NOTHER attachment for imposing

linew duties on the versatile tractor is disclosed in pafent No. 563,125, by Athey Truss Wheel Ca, Chicago, Illinois, U.S.A. ' The scheme is directed towards using the tractor as a generalpurpose excavator and loader, Although a tractor of the crawler type is illustrated, other types may also be employed.

The tractor is fitted with a surrounding girder framework upon which the bucket-carrying boom (1) is pivoted. Arising from the framework is a pair of curved tracks (2) which serve as guideways to the U-shaped boom. A bucket (3) is attached to the boom, and can be lifted and swung over to the rear to discharge its load into a ' chute (4), from which it can fall into an Accompanying transport vehicle. A cable-drum (5) hauls the boom, the power coming from the tractor engine via a transmission gear (6) driven from the front take-off (7) by means of a long cardan shaft. A lever-operated second cable (8) enables the contents of the bucket to be tipped forwardly if desired. Those interested should obtain a copy of the specification which is fully detailed and accompanied by 38 drawings.


THE subject of patent No. 563,425 is a rubber-mounted suspension unit by C. Macbeth and V. Loyd, Copper Hall, Camberley, Surrey. Although initially intended for the idler wheels of endless-track vehicles, the scheme is said to be suitable for road vehicles.

A pair of bifurcated arms (1 and 2) each carry a wheel and are mounted in an interspaced relationship on a stationary pivot pin (2). Between the arm bosses and the pin is a number of rubber bushes (4) which accounno the rubber members (5) in shear. When used on a normal road vehicle, the unit may be articulated to the ordinary suspension system.

IMPROVEMENT IN FABRIC UNIVERSAL JOINTS QOME years ago the Hardy fabric Odisc-type universal coupling was fitted as standard on many makes of vehicle, and whilst the present tendency is towards the use of the all • metal type, its inherent simplicity will always eniure a widespread use. A moderniied version of the disc forms the subject of patent No, 563,312, from Hardy, Spicer and Co., Ltd., and others, Birch Road, Birmingham, 6.

The improvement lies in the use of better material; instead of the cotton formerly employed, it is proposed, to substitute regenerated cellulose yarn, the object being to increase the flexibility. " Tenasco is the yarn mentioned, and it is woven with the weft straight and the warp somewhat looser, the latter thus being more extensible. The disc is then completed in the usual manner by impregnating it with rubber


THE high drawbar pull of a modern tractor often sets problems of ground adhesion, and many are the

devices proposed to assist it. A

scheme for ballasting a pneumatictyred wheel to enhance the grip, forms the subject of patent No. 563,403, from R. Howarth, White Thorns, Nantwich, Cheshire.

This inventor proposes to provide a hollow wheel, the interior of which can be filled either partly or completely with water. The drawing shows a part-section of the wheel in which 1 is the tyre rim and 2 the water space. Plugs (3) are provided at three points around the periphery so that filling or draining can be conveniently performed wherever the. wheel may stop.

The removal of the core from the casting would seem to be.rather a problem, although the inventor states that it can be blown out through the plug holes by means of compressed air. It would be essential to make adequate provision for complete drainage, as in the case of an engine cylinder block,

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