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Design for a Disc Brake

8th November 1946
Page 48
Page 48, 8th November 1946 — Design for a Disc Brake
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Which of the following most accurately describes the problem?

WHILST the use of disc brakes has, VV mostly, been confined to aircraft, the experience gained in this respect might usefully be applied to other heavy-duty purposes. Such are the . views of the Benclix Aviation Corpora: lion, South Bend, Indiana, U.S.A., which concern discloses, in patent No. 579,172, a layout of this type of brake.

In the design illustrated, the hub member is connected with a pair of discs (I), which are slidably driven by a series of square-section keys (2). Interleaved with these rotary discs is a stationary set, loosely mounted on bolts (3), and it is these plates which carry the friction facing.

Operation is by end-pressure, applied, in this case, by a ring-like piston (4) complete with sealing ring and hydraulic connections. When the pressure is applied, the ring is forced to the right and engages the two sets of discs after the manner of a clutch. The return motion is performed by springs, not shown in this drawing.

The patent is mainly concerned with the rotary discs; these are slotted in a special manner, so that heat expansion will not force them out of a true plane.

WINDOW UNIT FOR BUS BODIES TO ease the work of a bodybuilder in I fitting windows to buses and coaches is the object of a design shown in patent No. 578,362, by W. Young, Claydon Works, Mill Road, Wishaw, Lanarkshire. To this end, the window is made in the centre of a panel which can be trimmed to any desired size, and built-in after the manner of a plain panel.

To the base panel is secured, by welding, a light three-sided frame (1), the outer edge of which is doubled to accommodate tapped holes for screws (2). The screws serve to secure a light external frame (3), which grips the glass, via the medium of a formed rubber strip. By removing the screws and frame, a broken glass can be replaced easily and quickly. The window shown is a simple single pane, but the scheme is equally suitable for sliding or hinged windows.

NOVEL SUSPENSION SYSTEM

ALAYOUT for an unorthodox method of suspension is shown in patent No. 578,975, which comes from R. Greaves, " Seacrest," Cornelian Drive, Scarborough, Yorks. The scheme is claimed to abolish pitching, rolling and wheel bounce without recourse to stabilizing devices.

The drawing illustrates the geometri cal features of the system in a some 578.362 what diagrammatic form. The axles (1) are attached to tension bars (2), which are fixed at one end to the chassis at point 3 and at the other to the bottom of shackles (4). The midpoint of the shackles is connected to the frame via rods (5), whilst the upper ends carry rods (6), which are attached to the ends of the horizontal leaf springs (7). The axle is thus attached by a tensioned network having no compression members except the shackles.

Under load, the axle tends to rise in relation to the frame, and as rods 2 and 5 cannot lengthen, the upper rods must move and stress the springs. The change of angle of the shackles gives a rapidly increasing ratio of force to deflection, so that the system is, in a large measure, self-adjusting to varying loads.

NEW TYRE GIVING HIGH ROAD ADHESION

rAA TYRE claimed to give exceptional driving contact under conditions of snow, ice or mud, is shown in patent No. 579,127, by C. MacCallum, 73, Dunlop Street, Glasgow, C.1.

The drawing shows the scheme as applied to twin-tyred wheels, although it may be used on a single wheel if desired. Each tyre is made with four circular tread-segments interspaced with four flats, and the two wheels are assembled so that a set of flats comes opposite a set of curved portions; this means that on a fiat road a complete running circle would be formed.

On a soft surface, however, the circular part may sink in, as shown in the right-hand drawing, and when this occurs, the flats take up the drive. The greater area then in contact is claimed to minimize slipping and help to get the twin tyres into the driving condition again.

As applied to a single tyre, " flats " and " rounds " are staggered. On level ground there is always a continuous circular section LI contact with the road.

LUBRICATING ROTARY VALVES

ROTARY valves of the conical type must be a close fit in their housings if a good seal is to be made, yet these very conditions also tend towards squeezing out the film of lubricant. To obtain an effective compromise is the aim of a design shown in patent No. 578,866 by the, Briggs Manufacturing Co., Detroit, Michigan, U.S.A.

Dealing first with the general construction, the ported cone (I) is rotated by an external gear, and uncovers inlet and exhaust ports at timed intervals. The cone it hollow, as at 2, and is filled with metallic sodium to assist heat flow. The cylinder carries an intermediate plug (3), which protects the lower face of the valve from the flames of combustion.

At the top of the cone is a free-floating collar (4) made of bronze; this takes the main thrust at the upper end. The essence of the patent is the provision of a semicircular clearance space (5), which is greatest at the bottom, tapering away to nothing at the bronze collar. This clearance, greatly exaggerated in the drawing, allows for expansion, and provides space for a film of lubricant to enter. An adequate oil supply is provided for by means of ports leading from passage 6.

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Organisations: UNIT FOR BUS BODIES TO
Locations: Glasgow, South Bend, Detroit

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