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Novel Self-expanding Piston
Page 87
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A .R.stune of Patent Specifications that Have Recently Been Published
MANY schemes have been propounded for preventing pistons from becoming slack in the cylinder bores, and these have consisted, mainly, of sprung split-skirts • and similar devices-. A novel suggestion in this respect . comes in patent No. 496,623 from II. Ilaneborg, Nobelsgate 20b, Oslo, Norway.
• This inventor, proposes to use hydraulic pressure of the oiling system as a means for expanding the piston against the cylinder wails. Referring to the drawing, the piston comprises a usual ring-carrying head, fitted with lugs (2) surrounding the gudgeon pin. The skirt portion is made in halves, with bosses (1) which serve as gudgeon-pin bushes. The bores of the bosses are closed at the outer end, so that the pressure of the lubricating oil forces the halves of the skirt outwardly, rather in the manner of an hydraulic brake-expander.
German Practice in Injection-pump Design.
THE latest suggestions in the design 1 of injection pumps are embodied in patent No. 496,346, which comes from the Auto Union A.G., 110 Schef
felstrasse, Chemnitz, Germany, This pump. Operates on the differentialplunger principle, there being two plungers to each' unit, the movement of each being identical, but differing in phase.
Referring to the drawing, the two plungers (6 and 1) ai-e moved downwards by an overhead cam and
returned by a spring. In operation, plunger 6, when at the top, draws in charge of fuel to space 4. By this time, however, the phase difference has the effect of accelerating plunger 6, so that when space 3 is uncovered, injection takes place into port 2. Injection ends when space 3 is once more closed by the descent of plunger 1. Output is regulated by an advance-retard mechanism connected to one of the overhead camshafts.
Cooling Injectors by Induced . Draught.
THE problem_ of cooling the injectors of an oil engine is solved in a simple and ingenious manner by Bryte, Ltd., and A. Thomas, Kelvin Works, Hackbridge, who disclose their Suggestions in patent No. 496,523. The scheme employs an arrangement of aircirculating conduits in and around the injector, the motion of the air being induced from the intake-pipe of the engine. Referring to the drawing, Or enters space 4. around the body, flows downwards and into ports (2) in the injector. From this point, it travels
upwards inside the body and emerges from port l to which is attached a pipe leading to the intake of the engine.
In another scheme, the air is drawn off from the bottom (3) of the iecess; this obviates the need for an extra pipe from the injector.
Brockhouse Trailer for Specialized Transport.
NAANY special-purpose vehicles have I.V.I.ernanated from J. Brockhouse and Co., Ltd., Victoria Works, West Bromwich,and•still another is disclosed in patent No. 496,549 by this concern and A. Dear. This design shows a trailer intended for the transport of comparatively Tight, bulky and fragile loads, a motor boat being shown as an example.
The drawing shows one of several designs; in this case a two-wheeled trailer is shown, complete with the usual drawbar arrangements. The frame is of girder construction, the side members extending at the rear to a pivot (3) ; at this point, bearings are provided Upon which the floor of the vehicle is Mounted. The floor consists of a framework fitted, for its whole length, with rollers (4), and being pivoted at -point 3 can be lowered to the groUnd. at the rear to allow the load to be hauled up the roller-bearing floor by means of a winch. After loading, the floor is returned to the horizontal position and locked. To stabilize the vehicle during the loading operation screw-down jacks (1 and 2) are provided.