HOLES WOVEN IN BRAKE LINING.
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A Résumé of Recently Published Patent Specifications.
Tr IRCHBACITSCHE WERKE 1.I.KIRCILBACH AND CO., of Coswig, Germany, in specification No. 240,409, describe a method of weaving brake-lining material in which no weft threads or cross threads are employed. We' believe the method might be more correctly described as plaiting, or braiding, and somewhat resembles the plan on which shoelaces are woven. Other features of the invention are the formation of the material in a curve suitable for the shoe to which the lining is destined to be attached, and the forming of holes, without interfering with the continuity of the threads. The upper left view shows a drum of the diameter and width of the shoe for which the lining is intended ; the threads will be seen to pass from one side to the other, and 88 they do they interweave, as shown in the lower view. When complete, the fabric is subjected to heat and pressure, and, when hardened. one of the flanges is removed, and the ring of fabric is cut into suitable sections for nee. The right-hand views show how the threads can be made in some cases to miss certain parts so that holes and countersinks can be formed in the process of manufacture, so avoiding drilling and the consequent interruption of the threads.
We have on several occasions advocated the forming of brake linings to certain standards, with their boles already formed in a similar manner, as this would strengthen the lining and avoid waste of time and material.
A Hydraulic Tipping Trailer.
ERN ST WIRZ, of Zurich, in specifi
cation No. 262,618, describes the transferring of hydraulic power from a tractor to a trailer for the purpose of operating a tipping body. The body shown on the left represents the tractor, whilst that on the right is the trailer. The usual draw-bar is employed for the purpose of pulling the trailer, and underneath this is the pipe transmitting power by means of compressed fluid to operate the tipping device on the trailer. It will be seen that universal joints are employed at both ends of the pipe, and that a stuffing box is fitted near the centre, so that perfect freedom from strain is provided. The universal joint on the trailer is
situated under the king-pin so that the fore-carriage of the trailer can turn in any direction.
A Three-shoe Brake.
A BRAKE in which three shoes are expanded simultaneously is shown in the specification No. 262,510, of B. E. Hopkins, In this arrangement the shoes are formed in the shape of a box, and can slide outward and inward on blocks projecting from the anchor plate, and are pressed inwards by springs, as shown in the upper shoe. Each shoe is provided with an extension at each end. The spaces formed by these extensions are occupied by triangular cams, one of which is actuated by a lever, and its tail piece imparts rotary movement to a ring mounted on the axle, and, by means of the three A New Fuel Mixture.
ERNEST G. E. MEYER, in specifi don No. 262,363, describes a new fuel mixture which he explains as follows :—The process of producing a fuel adapted for use in internal-combustion engines, in accordance with the invention, consists, broadly, in treating mineral oil or liquid coal tar oil distillates of relatively high boiling point with relatively small proportions of ether and ammonia or like volatile basic material, and without the addition to the fuel of sulpha'', wood spirit or naphthalene flake.
Fuel, according to the invention, therefore, consists essentially of mineral oil or liquid coal tar distillates of relatively high boiling point to which has been added small proportions of ether • and ammonia. Optionally the fuels may include in addition to hydnocarbon material of relatively high point and ether and ammonia, also a relatively small proportion of fuel material of low boiling point, such as a volatile hydrocarbon.
Hollow Valve Heads.
VALVES with heads which are hollow
are shown in the specification of A, G. Greiner and 0..1. Long, of 'U.S.A., in specification No. 266,023. The advantage claimed is that heat will not so readily be transmitted from the head to the stem, as the hollow space will interrupt its pass a g e. The specification says that heat transmitted from the head to the stem causes the latter to expand and to distort. Our own experience on this side of the Atlantic is that inlet valves do not suffer in this way, and that the burning away of exhaust valve stems is mainly due to the passage of the hot gases as they escape when the valve is open.
To Prevent Wheel Wobble.
SIR HERBERT AUSTIN, in speci
fication No. 262,517, describes a method of preventing the wobble of steering wheels. The specification points out that steering ,wheels have a tendency to oscillate at their own particular periodicity, and that this tendency can be counteracted by another vibrator having a different periodicity, the separate vibrator being connected to the wheel by means of an elastic member, so that one vibration may damp out the other. To effect this he fixes a spring arm to the steering head and provides an adjustable weight as shown in the lower view. In some cases he proposes to utilize a bumper bar as a weight, as shown in the upper view.
Mention is also made of providing a telescopic arrangement in the coupling bar of the steering, having springs set to oppose each other, so as to provide a slight elasticity in the bar as to its length, and by this means to allow the two steering wheels to vibrate at separate perioda.