An Improved Form of
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Fuel-injection Pump
A Résumé of Patent Specifications That Have Recently Been Published FROM Societe Generale des CarlOurateurs Zenith, 10, Rue Petitot, Geneva. Switzerland, comes patent No. 401,177, describing an improved form of multi-cylinder fuel-injection pump. The object of this invention is to provide an individual output adjustment for each cylinder, at the same time allowing for a common control. The illustration shows its application to a two-cylindered pump.
The basic principle is the provision of a helical groove on the piston (2), which allows the low-pressure duct (5) to be connected to the compression space for a predetermined distance. By rotating the pistons slightly, a greater or less amount of fuel is thus pumped. A rack (3) meshing with pinions (4) provides a common control, which forms the usual accelerator pedal connection.
Individual setting is carried out by the screws (1), which mesh with wormwheel teeth cut on the cylinder barrels (6). These turn the cylinder through a small angle with respect to the piston; by this means a fine adjustment is attained. No claim is made for this method of adjustment, except in connection with fuel pumps.
An Aid to Driving in Fog.
ADEVICE to aid driving in mist or fog is shown in Patent No. 400,310, of Dorman, Long and Co., Ltd., Zetland Road, Middlesbrough. This specification deseribes" a simple, sturdy form of construction for the type of reflector known as the "cat's eye," which is designed to be let into kerbs or other road boundaries.
Several forms are described, consisting basically of a crystal backed by a reflecting surface. A curious claim is the provision of a left-hand thread in the assembly, to minimize the risk of unauthorized removal. Whether in these enlightened days the ubiquitous small Isny can be outwitted in this simple manner remains to be seen.
Running Petrol Engines on Heavy
APPARATUS by which, it is claimed, petrol engines may be run on heavy oil is shown in patent No. 401,156, by Buttonwood Motor Engineering Co., Ltd., and Arthur Roger, Warrington. The specification is concerned solely with a method of heating the induction pipe with exhaust gases, and the claims are based entirely on the special method of performing this operation.
In the illustration the exhaust pipe is shown to have an enlarged diameter (1) for a short portion of its length. Branching from this is the inductionjacket supply pipe (3). After leaving B44 the jacket the gases are returned via tube 4, around pipe 3, to an annular space (2), where they rejoin the main stream. Owing to the velocity of the main stream, a suction effect is produced at 2 which, it is claimed, reduces any tendency to produce back-pressure with the apparatus • A New Fuel Pump.
FLTEL-INJECTION pumps are a problem calling forth many ingenious devices, and patent No. 400,805, by F. and F. K. jacecek, of
Nusle 11, Prague, Czechoslovakia, is a further attempt towards a solution.
This pump has two pistons, one of which (1) is reduced in diameter for a portion of its length. The smaller section slides inside a second piston (2), thus leaving an annular displacement space (3). When the pump is operated by moving the piston (1) in an upward direction, the inlet port (4) is first covered, and then the fuel (in the annular space) is carried upwards with the two pistons moving as one
against a spring pressure. So soon as the outlet port (5). is uncovered, the upper piston ceases to move and the fuel is discharged into the engine, via . valve 6.
It is asserted in the specification that an annuldr displacement space allows of more accurate measurement of the quantity of fuel.
Silencing Brakes.
VIBRATION and noise from brakes are always unpleasant, even if not mechanically destructive, and an attempt to remedy this trouble is shown by the Lockheed Hydraulic Brake Co., Ltd., Brock House, Langham Street, London, W.1, in patent No. 400,676.
The brake shoes are made in two side-by-side sections (1 and 2), each of approximately half the width of the drum. Interposed between them is a layer of soft fabric (4), the pair being lightly clamped together by springs and bolts (3). A feature of the invention is that two narrow shoes are operated differentially through a 'rocking bar (5), or by means of two pistons in a double hydraulic cylinder.
Facilitating Oil-engine Starting.
SIMPLICITY is the keynote of Patent No. 400,312 from the Daimler-Benz Aktiengesellschaft, of Stuttgart Untertiirkheim, Germany. The object is to provide electric current for the heater plugs of oil engines, usually supplied from an accumulator.
It is proposed in this specification that the usual engine-driven dynamo shall be disconnected from the power unit by a small dog clutdi, and then driven by hand to supply the heater plugs. Batteries are apt to be out of commission when most urgently required, it is stated, and this invention overcomes the possibility of a run-down battery preventing a start. From one to three minutes of hand operation is said to be sufficient, and the labour of thus generating current of the required, amperage is not great.