Electric Operation of Hydraulic Trailer Brakes
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To avoid the necessity of trouble1 some fluid connections between tractor and trailer is the object of the scheme shown in patent No. 499,619, which describes a means whereby the trailer brakes are operated electrically. The patentee is J. Kohler, .Beymestrasse 15, Berlin-Grunewald,, Germany.
The drawing shows, in diagrammatic form, the trailer mechanism, which operates as follows:—Upon switching on the current, the motor-driven gearpump (6) drives oil through a one-way valve (5) to the brake cylinder (4). Stoppage of the pump leaves the brakes on, their release being obtained by reversing the pump, which then sucks down a spring-loaded piston (2) and thus opens a return conduit (1). Excessive pressure is prevented by a safety valve (7), whilst an air reservoir (3) imparts elasticity to an otherwise rigid fluid circuit.
Stronger and Lighter Brake Drums.
ABRAKE drum, which is said to be light, durable and more favourable for heat dissipation, is shown in
patent No. 499,511, by W. Foden, E. Twemlow, and Fodens, Ltd., 411 of Elworth Works, Sandpach, Cheshire. The drawing shows clearly the improvement, which consists of the provision of helical ribs on the outside surface of the drum. These are cast in one piece with the drum and are arranged in the form of a four-start thread.
Hydraulically Controlled Variable compression Engine.
ENGINEERING progress in the Far East is exemplified in patent No. 498,919, which shows a multicylindered engine equipped with a device for varying the compression ratio. The patentees are K. Tsuenda and Y. Hironaka, Kanoashi-gun, Shimane, Japan.
The patent is concerned with the variable-compression system and the means for actuating it. As shown in the drawing, each cylinder is surmounted by 'a second shortcylinder containing ati inverted piston (2), which acts as an adjustable I head to the combustion chamber. Outward movement of the piston increases the compression space; and vice versa. The method of operation is to ffilthe space behind each of these pistons with water supPlied by a pump (3) and regulated, as to quantity, by intake suction.
B38 being transmitted to the gear pump. A diaphragm-operated valve (1), connected to the intake of the engine, acts as a master controller of the hydraulic system. Modification in Combustion System.
FROM H. Ricardo, 21, Suffolk Street, London, S.W.1, comes patent No. 499,778, describing the latest modification to this inventor's well-known combustion system, the original design of which was disclosed in patent No. 439,426. The present improvement comprises the use of a circular recess (1) in the-piston crown, combined with a shallow tangential groove (2). The latter, at top dead centre, lines up with a sloping passage (3) leading from thespherical combustion chamber (4) in the head.
Preventing Fluid Leakage in Tipping Gears.
CROM Bromilow and Edwards, Ltd., and H. Swift, both of Foundry Street Bolton, comes patent No. 499,227, describing means for improving the fluid-retaining properties of hydraulic tipping gears of the three
way variety. A pair of double-telescopic cylinders is employed, one near each side of the chassis frame (4). For a rearward tip, both cylinders are expanded, but only one is used for a side tip. The cylinders are carried by a cradle (7) mounted in frame pivots (1), whilst the cylinders are again pivoted about trunnions (6), at rightangles to the frame pivots. The fluid arrives, via pipe 3, and is sealed at one pivot by a rotary stuffing box (2). From this point it passes to the trunnions (6).where stung boxes are fitted: The fluid is then led through pipe Cl to the ram bottoms.