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A Brake with Two Leading Shoes A BRAKE mechanism intended for

14th July 1944, Page 36
14th July 1944
Page 36
Page 36, 14th July 1944 — A Brake with Two Leading Shoes A BRAKE mechanism intended for
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heavy-duty work, such as steering an endless-track vehicle, forms the subject of patent No. 561,301, from Automotive Products Co., Ltd., and L. Chonings, both of Tachbrook Road. Leamington Spa. In the scheme shown a single spreader actuates two shoes, both of which, in effect, work as lead

ing shoes, •

Referring to the drawing, the spreader (1) is an hydraulic cylinder fitted with a pair of 'opposed pistons; these abut, in an inward direction, against the ends of the cylinder. The right-had piston -bears directly upon the right-hand shoe, the latter rocking about a pivot pin (2). The motion of the left-hand piston is transmitted to the bottom end of the other shoe via a bell-crank (3), a strut (4), and a second bell-crank (5) pivoted on the shoe; this bell-crank abuts against a stop (6). A pivot pin (7) acts as the anchor for the left-hand shoe.

Adjustment is provided for by an extensible serrated portion (8) on the upper .piston and a similar screwed lengthener (9) on the bottom anchor, HYDRAULIC CONNECTION TO STEERABLE WHEELS

THE transmission of brake pressure 1 to steerable wheels should in no way affect their freedom of movetnent,

and a scheme intended to ensure this forms the subject of patent No. 561,349, from the Rover Co., Ltd., and P. Scott-Iversen, both of Chesford Grange, Kenilworth.

It is proposed to pipe the hydraulic fluid through the bore of a tubular kingpin. The drawing shows a section of the steering joint in which a bifurcated stub-aXle embraces the end of the front axle The pipe connection (1) is attached to the top of the pin, whilst the hydraulic cylinder port (2) is arranged in line with the pin axis, 1 ensure a good joint, irrespective of wear, a double-flanged connector (3)J is used to 'complete the flui'd line. It is provided with thick rubber washers, the lower one (4) being pressed on to a conical seating," whilst the upper one (5) is a resilient piston-like fit in its snrrmanding bore. WHEN the carburetter throttle is Ylf suddenly closed at .high engine speed there is a risk of the mixture in the induction system being fired, a phenomenon commonly known as "popping-back." This is particularly undesirable in a two-stroke engine, which may possibly have an induction system full of pre-compressed mixture. Patent No. 560,874 shows a means for preventing this trouble, the patentees being Morris Motors, Ltd., and A. Issigonis, both of Cow:ley, Oxon.

The scheme employs a movable slowrunning stop on the carburetter, its position being governed by the clepresskm in the inlet pipe. In the drawing, the throttle stop screw (1) abuts against a movable stud (2); this, in turn, abuts against the cylindrical po:tion of a rod. (3), a position which leaves the throttle slightly open for idling. But should the throttle be suddenly to be temporarily fully closed, thus completely isolating the induction system from the inlet to the engine. As theengine slows down, the depression decreases and the diaphragm once more returns the stop to the normal slow-running adjustment.

PROVIDING FOR ANGULAR MOVEMENT IN TIPPER RAMS

HYDRAULIC tipper rams of the I 1 cylinder-and-piston type are fre--• gnently subjected to side loads due to operating on uneven ground; in extreme cases this may lead to jamming of the *parts. To avoid this is the object of an improved mounting shown in patent No. 561,383, by Edwards Bros. (Tippers), Ltd., and J. Edge, both of Springfield Garage, Bradford Street, Bolton, Lancs.

The drawing shows a typical ram in a position of considerable displacement. due to uneven load. To permit of a Moderate amount of corrective movement, the upper cylinder (1) is slidably located in a slot (2), which allows it to move into the position shown. When descending in this state the cover tube (3) has to slide over the bottom sleeve (4), and, to assist this, the lower end of the tube (3) is outwardly flared, whilst the sleeve (4) has a tapered nose.

Tabsorb torsional vibration is the object of a flexible clutch plate covered in patent No. 561,192, by V. Stanley, Gwynant House, Beddgelert, Caernarvon. Only the driven plate is modified, the other two being of normal design.

The drawing shows sufficient of the proposed plate to illustrate its action. The 4,1ined hub is fitted with radial spokes which carry the friction facings, the latter being separate members. The spokes are of sheet metal, and are slit, as shown at 1, to increase their torsional flexibility. Actually, the offset slit gives a slightly greater resistance in the driving direction whilst, in the coasting sense, the weaker side comes under load. The ends of the spokes may be housed in notches in a steel plate (2) or the notches may be pressed into the friction facing itself.

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