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side of the spindle is attached permanently to it and has a cylindrical extension at its root diameter on which the outer flange is free to move later ally. The lateral movement of the inner flange is with the motor, as its moves along the diagonal A Selection of Notes on Recent Equipment and slides. The opposite, or outer, flange running on a New and Well-tried Methods and Materials ballrace bearing is attached to a steel bar, which is supported by a sliding bar mounted and carried by rigid brackets from the base plate. This sliding bar is also set at an angle to the line of the belt A Chemical Resistant Lacquer formers, so that on the return stroke the tube is drive and it controls the lateral movement of the automatically ejected from the former. outer flange of the pulley. Thus, through the Tretol Chemiprufe is a clear lacquer that has It has ample power to bend, cold and unloaded, control wheel, the flanges of the pulley can be unusual properties of resisting attack by chemi all classes of steel tubes to B.S.S. 1387: 1947 and opened or closed so as to increase or decrease cals and corrosive atmospheres. Intended prim also electrical conduit tubing from ⅜ in. to 2 in. the driving diameter, and the speed, as required. arily for use over Tretol Chlorinated Rubber diameter. It is designed to perform by hydraulic Automatically, at the same time, the unit com Paint, it has many other uses, since it can be used power, under fingertip control, operations which pensates exactly for the alteration in the distance to reinforce ordinary paints, or can be applied hitherto have been carried out by continued between pulley centres, thus maintaining at all direct to bare metal. It is virtually colourless and physical effort. times the same belt tension and perfect alignment barely tints even white and near-white colours. of the belt. All movements take place simul Further details and a specification can be ob Since it can be applied by brush or spray, is touch taneously so that, while the unit is actually tained from the manufacturers, Chamberlain hard in the hour and fully set within twenty-four Industries Ltd., Staffa Road, Leyton, London, driving, an infinite variation in the speed ratio hours, it has many applications. By brush one E.10. can be effected by the simple turning of a hand- gallon will cover 70 sq. yds. and with the spray wheel. At all times the drive is positive, whether 75 sq. yds. The price varies from 36s. 6d. for one the ratios are being increased or decreased, and A Variable Speed Drive gallon to 35.?. for twenty-five gallon lots or over. the conditions of an ordinary fixed V-belt drive Full details can be had on application to the The designers of the new Druce-Elliott Vari as to efficiency etc. are constantly maintained. makers, Tretol Ltd., 12 North End Road, able-Speed Drive Unit have for many years been Belt stretch can be taken up by simple adjustment London, N.W.11. manufacturers of the spring-loaded type of ex of the slide bar, it being unnecessary to touch panding pulley for V-belt transmission; with their either the motor or motor base. The unit is considerable experience of this type of equipment adaptable to any motor frame size and is most A Motorized Hydraulic Tube Bender they have at all times been aware of its many suitable for power units ranging from fractional shortcomings, yet there has been available no up to 10 h.p., although one unit has been in use In addition to the Staffa 4 in. Motorized practical variable-speed drive of a simple for some time on a printing machine operating Hydraulic Tube Bending Machine, a redesigned mechanical type as an alternative to spring-loaded with a 40 h.p. motor. 2 in. machine incorporating the special features pulleys for effecting the alteration of the gap of the former is now available. This new machine There are six standard sizes of pulley from 3in. between the pulley flanges in order to provide (with overall dimensions of 3 ft. 1 in. by 2 ft. 1½ in. to 12 in. providing maximum variations of ratios infinite variation of driving speed. by 1 ft. 7 in.) is a neat, compact and entirely self- from 2 to 1 up to 5 to 1, using V-rope sizes from Obviously, the most perfect form of V-belt contained unit, which requires no hydraulic ½ in. to 2 in.—it is also available for multi-groove drive is from one fixed pulley to another and the accumulator or airline, as the pump is mounted type driving V to flat. task the designers of the new drive set them in its own reservoir of Shell Tellus 27 Hydraulic The Druce-Elliott Variable-Speed Drive Unit selves was to eliminate all springs and to perfect Oil. The steel body has been specially designed is marketed and distributed by the Package a method of positively controlling the flange gap to ensure maximum strength and to reduce the Sealing Co: Ltd., Essex Road, Acton, London, setting, at the same time automatically compen floor space to a minimum, so giving the operator W.3, from whom full particulars can be had on sating exactly for the alteration of the distance the advantage of being able to walk round the application. between centres and consequent belt lengths and machine without the interruption of extraneous to provide the same power efficiency in drive fittings such as outside cylinder, hose, etc. Thus, with the same conditions of belt performance as from the front of the machine there is an uninter with standard pulleys of fixed diameters. rupted view of the work at the 'bending head'. The principle of the new unit is simple and its The complete power unit is totally enclosed by construction is compact and robust. The motor is a detachable top housing. Hydraulic power is mounted on slides and its fore-and-aft movement provided by a patent Beacham high-pressure is controlled by a handwheel operating a screw swashplate pump mounted directly above an 8-ton, thread in the base plates. The slides are on an 10-inch stroke, double action ram unit. The pump angle to the direction of the drive, so that the unit is driven by a ½ h.p . electric motor suitable alignment of the belt shall be correctly main for a 220-230 Volt single phase, 50 cycles supply, tained whatever the position of the pulley flanges or, alternatively, a 400-440 Volt, 3-phase motor. and the motor. The inner pulley on the motor A panel is incorporated in the rear of the housing cover from which extends a 7 ft. length of V.I.R. cable ready for connexion to a three-pin plug. A three-way control valve fitted with a relief valve for 'Forward', 'Return' and 'Neutral' positions is operated by an easily accessible lever mounted at the front of the machine. All con necting pipes arc made from two-wire braid pressure flexible hose with oil-tight connexions. Special take-off arms are provided on the end June 1951 183
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Jun 1, 1951
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