HYDRAULIC CONTROL OF GEAR - CHANGES.
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A Résumé of Recently Published Patent Specifications.
UREDERICK W. LANCHESTER, in specification No. .12 253,173, shows a means for operating the gears of an upicyclie gear by means of oil pressure. With epicyelic gears it is usual to arrest certain elementa of the train by neans of brake bands, or similar devices. In the present invention, however, a series of hydraulic rums is employed to exert pressure on the drum to be arrested. A pump is employed to provide a pressure of oil which is conveyed to the various trains of gears by means of pipes. Suitable valves are employed to direct the pressure to the
. particular drums to be arrested. A common duct is provided which acts on all the rams around the drum, so that when pressure Is applied all the rams tend to press inwards, -and by so doing exert pressure on the drum. Compression • springs are placed between the rams so as to make them release the drum when pressure is not forcing them inwards.
A Magneto With a Revolving Magnet.
THE Robert Bosch Aktiengesellschaft, of Struttgart, in specification No. 241,163, show a magneto of the class in which the magnet revolves and the armature is stationary. Two plates of non-magnetizable metal are mounted so that they form a drain which contains the bar magnets. The pole pieces, which are formed of many in rainations pf special steel, are riveted to one of the side plates, and pieces of metal are so placed that they confine the magnets to their place within the drum. Tire armature is formed Of many plates and forms the horseshoe, with the winding as shown. Economy
and ease of manufacture seem to be the main points aimed at, for, it is claimed, the steel Plates in this form of construction have the simplest conceivable outline and therefore can easily be stamped out and are not liable to be distorted. Again, they are all similar to each other, which cheapens the naanufacturer's production, and they have only to fit fairly well on their curved surfaces so that the magnet discs can have no dangerous play between the stops.
Inventions in Connection With Fuels.
DAVID COSTAGUTA, an Italian, of Buenos Aires, in specification No. 253,353, says that after long trials he has developed a pioduct which is superior to any known combustion intensifier.
In the manufacture of his .product he employs nitrated derivatives of phenol such as the trinitrophenol, to which be adds one or various liquid hydrocarbons and one or more ethers. A suitable mixture is trinitrophenol (1 per cent), ordinary ether C2113 —0-0211, (3 per cent.) and volatile hydrocarbon (96 per cent.) of a density of about 0.8.
Be givesthe following as a simple example of one of the various formulae which can be created.
Trinitrophenol ... 2 per cent. by volume. Benzonaftene, an Italian company, of Milan, in specification No. 231,157, describe a process for the treatment of heavy hydrocarbons in order to obtain a combustible gas and liquid products analogouS to petroleum or naphtha. Reference is made to specifications 231,459 and 231,460, and A further specification, No. 231,461, deals with apparatus for carrying out the various inventions.
A Servo Brake.
THOMAS BLACKWOOD MURRAY and the Albion Motor Car Co., Ltd., in their specification No. 253,278, describe a new form of servo brake. Several forms in which the invention can be applied are shown, but 'the one illustrated' is typical and is sufficient to make the principle clear. The brake pedal actuates a plunger which causes a driven disc to come into contact with a disc which is rotated by the mechanism' of the car. The friction thus set up causes the driven disc to tend to revolve and, having a pinion attached to it, to exert a pull on one of the brake rods which carry the racks shown.• • • No matter in which direction the driving disc may be rotating, one of the two rods will be carried forward and a braking effect produced. The long slots in the rear ends of the two rods will permit of a backward movement of the rod which is inoperative. Apart from the servo effect produced by this arrangement, a proportion of the power exerted by the driver on his pedal will be communicated direct to the brake by means of the floating link and the rod which passes above the racks.
An Anti-friction Steering Device.
THE Daimler Co. and Joseph Dixon, in specification No.
253,257, describe a form of steering device in which a taper roller engages with a worm of special shape for the steering of motor vehicles. The spccification describes the worm as being cut by means of a milling cutter of the same shape and size as the rolhr to be employed. It also says that the worm may be of uneven pitch—fine in the centre and coarse towards the ends, or it may be the reverse to this. So far as the general layout goes there does not seem to be any point of novelty in the design. Mention is made, however, of the fact that the roller, being tapering in form, can be adjusted by advancing it towards the worm by means of the screw caps provided for the purpose.