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Aviation History
1938
1938 - 0110.PDF
FLIGHT. JANUARY 13, 1938. The Industry (contd.) ANTI-VIBRATION MOUNTINGS Utilising New Rubber-to-metal Bonding Processes DEVELOPMENTS which may have an important influenceupon design and construction have recently beeneffected in the processes of bonding together rubber andmetal. Two or three years ago there originated in America a process whereby rubber could be bonded to steel so effectively that the rubber would itself yield under test before the actual joint would give away. This process was made use of for producing flexible mountings for car engines. More recently the bonding of rubber to metals and other substances has been the subject of considerable research in Germany and also in this country. Last August Flight de- scribed the intentions of Metalastik, Ltd., Evington Valley Road, Leicester, and it is now possible to reveal that this company is able to bond rubber not only to steel but to aluminium, Elektron, and even glass. It is expected that, in the near future, it will also be possible to bond rubber to such materials as Bakelite. There are at present two methods of bonding rubber to other substances, the one being a direct process, and the other a process in which the metal is electrolytically plated. Hitherto there has been a certain amount of trouble in the direct bond- ing process; although the bond may be good at first, there is a tendency for it to deteriorate with the passage of time, due to corrosion occurring under the rubber. Improvements have, however, recently been effected which are likely to make direct bonding more satisfactory in the future, although the method must naturally be the subject of prolonged endurance tests before it can be felt that a sufficient degree of success has been achieved. At present, therefore, a plating process of bonding is in use, the nature of the plating being part of a secret process. The fact, however, that rubber can now be bonded to light metals and alloys is of great importance to the aircraft industry, as it renders possible various forms of vibration-absorbing mount- ings. For example, engine mountings have been produced for both in-line engines and radial engines, while simpler forms of mountings are also being produced for instruments and for controls. As regards engine mountings, it may be pointed out that the use of rubber, in conjunction with scientific design, enables practically any desired degree of vibration absorption to te obtained. The mixing of the rubber itself, and its resultant hardness, is one controlling factor, while the thickness of the rubber is another. Furthermore, the coupling may provide, in certain cases, for the rubber to receive support from adja- cent metal surfaces as it becomes subjected to distortion under load. Such couplings are being applied to the mounting of airscrews, as well as to engines. Again, whereas a simple mounting for a car engine may have the rubber in compression only, a more complicated form of mounting for an aircraft engine may make use of the rubber under compression, tension and torsion. Indeed, there would seem to be a very wide field of -1 usefulness for these bonded rubber- metal fittings, for, obviously, they can be designed and used as shock- absorbing couplings for the trans- mission of power. In producing some of the more intricate forms of mountings and couplings many difficulties had to be overcome, and a special high- pressure moulding process has been developed. This process has also made it possible to use not only natural rubber, but- also synthetic rubber, which is impervious to the effects of .oil and heat. It will be realised that Metalastik, Ltd., have acquired considerable specialised knowledge in carrying out the developments recorded, and they are accordingly well qualified to give advice, and even to provide designs in any matter pertaining to the use of rubber-metal units. Two types of Metalastik mountings for in-line engines. NEW COMPANIES In the notes below, for reasons of space, the " objects " of new com-panies are usually somewhat abbreviated. AERIAL ADVERTISING COMPANY (GRIMSBY) LTD. Private company,registered December 16. Capita], £2,000 in 2,000 shares of £1 each. Objects : To acquire the business of aerial advertising carried on by H. B. G. Michehnore andR. A. C. Holme at Immihgharu, etc. The directors are : Herbert B. G. Michelmore (permanent chairman and managing director), air pilot; Richard A. C. Holme,air pilot. Solicitor: Alex Browne, 6. Town Hall Street, Grimsby, MUMWARE, LTD. Private company, registered December 17. Capital, £3,000in 60,000 shares of Is. each. Objects t To carry on the business of manufacturers of and dealers in silencers for hollow-ware, dealers in all classes of metal and rubberarticles and sundries, particularly such as relate to the silencing of such articles and the elimination of noise and of all kinds of waterproof materials ; manufacturersof and dealers in motor and aeroplane accessories requiring rubber grips, silencers and tyres, rubber importers, etc. The first directors are: Valdemar Rendle,inventor and patentee ; Joseph A. Richardson, patents developer; Millie Heading. Registered office : 4, Queen Victoria Street, London, E.C.4. R. C. COCKBURN & COMPANY LTD.—Private company, registered December31. Capital, £100 in £1 shares. Objects: To carry on the business of maintaining and operating aircraft and motor vehicles of all classes for hire, charter or taxipurposes, etc. The directors are Richard C. Cockburn and Mrs. Dorothy Cockburn Registered office : 38, Chancery Lane, London, W.C.2. TERRELLS WIRE ROPES, LTD.—Private company, registered December 28-Capital, £3,000 in £1 shares. Objects : To carry on the business of wire rope manu- facturers in Bristol and elsewhere ; to adopt an agreement with Wm. Terrell andSons, Ltd., for the purchase of certain plant, machinery and tools for the manu- facture of wire ropes, together with certain other matters ; to manufacture and dealin hawsers, cables and strands, netting, torpedo and aerial defence nets, mining and haulage plant, etc. Solicitors : Collins Woods & Vaughan Jones, 1, WorcesterPlace, Swansea. . JICWOOD LTD. Private company, registered January 8. Capital, £36,000 in36,000 shares of £1 each. Objects : To carry on the business of manufacturers of and dealers in timber, sawn goods, compressed and artificial wood veneers, plywood,cements, glues and preparations for treating, impregnating', waterproofing and working in wood and similar substances, furniture, boats, containers, aeronauticalgoods and appliances, etc. The directors are : Capt. Frederick T. Swann, Dr. Henry C. Watts, lohn D. Titler and Richard Bradfield. Offices: Weybridge Surrey. PUBLICATIONS RECEIVED Flags of All Nations, Is. 6d. Brown, Son and Ferguson Ltd., 52 58, DarnleyStreet, Glasgow, S.I. . . . Annual Report of the Smithsonian Institution, 1936, $1.50 (cloth cover). Super-intendent of Documents, Washington, D.C., U.S.A. Solilequiet in the Bath, by F. Karinthy, 5s. Wm. Hodge and Co., Ltd., 86, HattonGarden, London, F..C.1. Aero and Auto Engine Facts and Data, by H. R. Langman, 2s. Cd. TechnicalPress Ltd., 5 Ave Maria Lane, Ludgate Hill, London, E.C.4. A ircraft Propeller Handbook, by Karl Hansson Falk $4.00. The Rona'.d Press Co.,15, East 26th St., New York, U.S.A. Guide du Tourisme A utomobile et A trim au Sahara, 1938, Soci^ti Anonyme Francaisedes Pe'troles Shell, 46, Boulevard Camille Saint Saens, Alger. The Aircraft Bench Fitter by W. S. B. Townsend, 3s. 6d. Sir Isaac Pitman andSons Ltd. AERONAUTICAL PATENT SPECIFICATIONS. (The numbers in brackets are those under which the Specifications will beprinted and abridged, etc.): (Published January 6, 1938). 16474. NAGLER, B: Flying machine (476,598). 16472. NAGLER, B: Rotary-wing systems for aircraft (476,590). 1G473 NAGLER, B : Rotary-wing systems for aircraft (476,597). [Published January 13, 1988). 6414. HOOVEN, F. J. : Radio direction-finding apparatus (476,721).7400. GRAY, W. E. : Aeroplane wing flaps (476,073). 16713. KELVIN, BOTTOMLEY, & BAIRD, LTD., and RENFREW, D.: Apparatus forilluminating aircraft compasses (476,884). 16763. BINKS, C. L., and AMAL, LTD. : Fastening devices for aeroplane cowlings, and like covers (476,886).17069. LINK, jun., E. A. : Apparatus for training aircraft pilots (476,816). 17109. Moss, D. G. K., and PEIRCE. H. C. (trading as MECHANISM) ; Gyroscopicnavigational instruments (477,012). 17472, JABLONSKV, B.; Variable-pitch airscrews (476,897). 12890. SIEMENS AT-PARATE HSD MASCHINEN GES. •. Variable-pitch propellersautomatically regulated to constant speed (476,852).
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