No Hole Needed
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ANEW type of screw which is made by the Duro Dyne Corp. of America for fixing sheet metal and is marketed in Britain by Van Den Bosch Ltd., 76 Crown Road, Twickenham, Middlesex, requires no hole to be drilled for it to be fitted. The maximum thickness of metal on which the screw can be used is 14 s.w.g. The makers claim that it is possible to install 10 screws in a minute.
Duro-Dyne Drill Screws can be used with any high-speed low-torque drill, the only additional requirement being a magnetic chuck. This costs £2 5s. but is supplied free with each purchase of 17,000 screws. At the moment the only size of screw available is No. 7 by 0.5 in. long and these cost £2 I7s. 6d per thousand with a discount of 25 per cent on packs of 17,000. It is expected that a range of sizes will be available later in the year.
The screws have a special thread extending from the finely sharpened point to just under the hexagon head and this ensures full engagement with the metal without stripping. To use, the screw is dropped into the chuck, where it is held magnetically, and depressed firmly against the metal. The drill is started and as soon as the thread bites" the trigger is released, the drill's momentum tightening the screw.
As a trial offer, a magnetic chuck and a quantity of Duro-Dyne screws is being offered on seven days' free trial by the distributors.
Engine-driven Version
AVERSION of its portable Model FAP high-pressure greasing unit operated by a single-cylinder air-cooled petrolfTVO engine has been introduced by Centralube Ltd.. Eley Estate, Angel Road, London, N.18.
The grease unit is mounted w:th the engine on a fourwheeled trolley, the handle of which incorporates hooks on which the greasing hose can be carried.
Low Pressure Warning
AN electronic system to warn of low tyre pressures on lorries has been developed by the S.N.A.E. concern of
France. It has been given the name Electro-Signal and consists of devices fitted to the tyre valves which, when pressure fans to a predetermined level, send out a signal picked up by a small receiver . in the cab. Audible and luminous warnings are given to the driver.
Prices in France are 45 fr (£3 10s.) for each Electro-Signal device, 8 fr. (12s.) for a link cable at each wheel and 300 fr. (£22) for the cab radio receiver. Agency representation is being negotiated by the makers, but at the moment inquiries should be made to R. Powell, 15 Ruskin Park House, London, S.E.5.
Spray Painting
-THE latest developments in spray paint" ing methods are included in a 70page book entitled "The Spray Way of Painting" just published by AerographDeVilbiss Co. Ltd., Ringwood Road, West Howe, Bournemouth. Hants.
All aspects of spray painting are covered in the book with chapters devoted to the " Foam-in-place spraying method, for the application of polyurethane thermal insulation, and Airless paint spraying.
Transister Ignition
THE well-known American Mallory transistorized ignition system is being handled in the U.K. by Aeon Products (London) Ltd., 261 Pentonville Road, London. N. I, negative-earth equipment costing £18 8s. and positive-earth kits £1 Is. more. Claimed advantages of this ignition system include up to 8 per cent increase in h.h.p. output, better coldweather starting and greatly improved contact-breaker points' life.