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SOME RECENT BRAKE INVENTIONS.

29th September 1925
Page 30
Page 30, 29th September 1925 — SOME RECENT BRAKE INVENTIONS.
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A Résumé of Recently Published Patent Specifications.

JUDGING from • the number of patents recently granted for improvements in brake construction, it is obvious that, in the opinion of at least a few of the most experienced manufacturers, the brake as we know it to-day is capable of improvement. It is also noticeable that many of the improvements which we describe this weg,k emanate from firms whose experience is: beyond all question. We are, however, sorry to see that none of these efforts towards the production of a more reliable and perfect brake comes from any British company.

A Peugeot Invention.

THE Societe Anonyme Automthiles Peugeot, in speeifiCation No. 231,438, lay great stress on the importance of a brake shoe being provided with a means whereby it can be adjusted at its fulcrum or hinge, instead of, as usual, being adajusted by merely extending the action of the expander cam. The effect of the usual method is that many brake linings are worn out at the point near the cam, whilst the other end is in good condition.

The patent describes several methods whereby the shoe at its fulcrum end may be expanded, some of which we have already published. The most interesting of the methods shown appears to us to be that in which an automatic adjustment is provided which will, from time to time, automatically increase the distance between the two shoes near the fulcrum end. It will he seen that the shoes hinge on two separate Joints, each provided with a screwed stem. These stems pass through the tapped bushes (E), which, if revolved in one direction, have the effect of forcing the hinges apart, and by so doing effect an adjustment of the brake.

To ensure a simultaneous movement of the hinges, the bushes (F) are each provided 'with a worm wheel RS shown. Both these worm wheels engage a worm which is mounted in the spindle of (A) so that a rotary movement will ensure the hinges moving in opposite directions. A lever (B) is free to move on this spindle, and carries a pawl (C) which actuates the ratchet wheel shown.

A. lever (E) is attached to the shaft 046 of the expanding cam, and by means of the connecting rod imparts movement to the lever (B) at each movement of al). Should the movement of the cam become excessive, owing to the wear of the linings, it will cause the pawl to move the ratchet wheel to the extent of one tooth, which will have the effect of forcing the hinges of the shoes apart, so automatically bringing the brake into proper adjustment.

An Improvement in Brake Linings.

THE Kirehbachsehe Werk Kirchbach Co., of Germany, describe in their specification No, 283,304 a new method of forming the holes for the reception of the rivets in brake linings without weakening the fabric by drilling such holes. It is well known that in drilling holes .

in fabric, cutting of the threads which formthe warn at the fabric takes place, which, of course, reduces the strength of the material at that point. In the present invention the threa,ds are not cut where the holes for the rivets are made, but are pressed to one side, as shown. They are not only so treated for the reception of the body of the rivet, but for the head as well.

A Renault Improvement.

THE well-known, name of Louis

Renault appears in .specification Nu. 226,1.51, in . which, a servo brake is operated simultaneously with a brake of ordinary type, and, in which the servo operates equally. Whether the 'vehicle is moving forward or backward. The lower view shows a differential gear interposed between the levers which operate the ordinary and the servo brakes ; the rod (A) operates the ordinary brake, whilst the other rod is operated by the servo by means of the bellcrank lever shown in. the illustration, which sets up friction between the discs shOwn.

It will he seen that on the shaft shown in the upper view. there are four levers, the two upper ones operating the pal/ and push rods of the brakes, whilst the lower one (Al) is connected to the foot lever, and the lever (Al) is connected by two flexible cables to two points on the servo disc.

It will be seen that a movement of the pedal pulls the rod (A) as well as the other The latter sets Ili) a movement in the servo which pulls one

of the cables connected to Al, according to the direction in which the vehicle may be travelling.

Should the vehicle be stationary the servo action will, of course, not occur, but the rod (A) will actuate the brake quite independently of the servo.

A Ballot Invention.

IN sPecification No. 223,907, Societe

Anonym: des Etablissements Ballot, of France, describe a novel method of regulating the braking effect on a wheel, regardless of the speed at. which the vehicle may be travelling. It is well known that if a brake be applied with force whilst the vehicle is travelling at a great speed, the retarding effect may cause the wheel to act as a skate, that is to say it will no longer grip the ground, with the result that a sideslip or tearing of the tyre takes place, and a flat ia formed on the tyre. With brakes of the servo type, or where hydraulic or pneumatic pressure is employed, it is in some cases difficult to gauge the amount of power being applied to the brakes, With the result that. in some instances skidding takes place.

The present invention is intended to prevent the too, sudden application of a brake, and .provides a means whereby the brake releases itself' should, the braking effect exceed the adhesion of the tyre with the' ground. It will be seen that the brake drum is attached to the hub bY

means of a friction clutch consisting of a single-plate gripped between two frictional surfaces by means of springs. The grip of this clutch is sufficient to withstand the retarding force of a brake which is applied under any conditions, but' should the brake be applied whilst the vehicle is travelling at too high a speed for the braking effect to act properly, the impetus of the flywheel (A) will actuate the cam (B), which, by means of its inclined faces, will release the clutch and allow the brake drum to become rotationally freed from the hub

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