Cooling Injection Nozzles
Page 60
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A CCORDING to'patent No. 441,181,, IA whilst it is eminently necessary to cool the actual nose-piece of an injection nozzle, in order to avoid carbon deposits in the orifice, it is undesirable to cool the valve-needle, for if this be done, trouble may be experienced due to increased fuel viscosity. In the above patent, by N.V. de Bataafsche Petroleum Maatschappij, The Hague, Holland, is shown a design of nozzle end in which selective cooling is applied.
In the accompanying drawing, cooling-water ducts (1) are carried down through the nozzle assembly, and pass water around an annular passage turned near the -tip of the spray orifice. The basis of the patent appears to reside in the provision of a heat-insulating lining -to these ducts, although the actual material used is not specified. A further point is the use of an air-space (4) between the central needle:guide. (3) and outer portion 2. This arrangement minimizes the action of the cooling fluid' on the needle valve.
A Piston-ring for ported Cylinders.
THE use of ordinary, piston rings is inadvisable_in the case of engines having ports in the cylinder walls: such as two-stroke or sleeve-valve -types, owing to the tendency of the rings to.turn and spring out into the ports. Hitherto, such rings have been pinned at the cut, but pinning a modern thin-walled piston is not easy. Patent No. 441,224 shows a ring in which a small projection formed integrally with it engages with a semicircular notch in the ring-groove and effectually prevents rotation of the ring. -The inventor is A. Bonfa, 608, Umbilo Road, Durban, south Africa.
An Improved Rear Door for Vans.
ASIMPLE yet effective scheme for preventing the up-and-down movement that so often occurs on the rear doors of vans is shown by C. F.
rendered not only dustproof, but the whole structure is stabilized owing to the fact that the pair of doors becomes substantially a one-piece structure when closed.
It is thus enabled to afford support to the end of the body, the two interlocked doors constituting a rigid tie between diagonally opposite hinges.
A Load-hoisting Gear for Lorries.
A SELF-CONTAINED lifting gear ior use when loading vehicles is shown in patent Ng. 441,314 by Felco 'Hoists, Ltd., 17, Victoria Street, Lon-. don, S.W.1, and others. Referring to
the accompanying illustration, the gear. consists of a horizontal runway (2) carrying the lifting tackle and sup:ported on two pairs of pivoted uprights (4). Of these, the forward pair is reinforced by struts (5), which are ad
justably fixed to the uprights by sliding clamps (3). The operative posi-, tion, in which the runway overhangs the rear of the vehicle for picking up the load, is shown in the drawing in full 'lines, -whilst -the thain-lineS show the. apparatus. stowed away forward when out -of action,..
. :A feature of tile invention is the provision of' sliding supports '(1) Mounted on the tubular cross-members; these -enable the runway to be placed diagonally if-need be, So as to deposit the load in any desired place on the vehicle.
Valve Arrangements for Vacuum Brakes.
rROM Clayton Dewandre Co., Ltd.,
and S. H. Edge, both of Titanic Works, Lincoln, comes patent No. 441,414, disclosing improvements in the valve arrangements of suctionoperated brakes. This specification states that in systems in which a vacuum reservoir is used in conjunction with engine suction, it may happen that when a vehicle has just been started, the stored suction may be either absent or insufficient to operate the brakes. Furthermore, the result of an attempted application may be to release an undesirable amount of air from the vacuum tank into the engine intake.
To overcome this defect the patent describes a control-valve, the chief feature of which is automatic selection of the greater source of vacuum. That is, if the stored vacuum be low, then the engine intake is autOmatically chosen to operate the brakes, a condition persisting Until the tank has been exhausted to the enfiect degree:.