128 AIRCRAFT ENGINEERING May, 1931 A New Riveting Process giving a Flat Surface—A Streamline Wheel—Hydraulic Brakes Wit h regard to the fractures obtained it was Lockhee d Hydraulic Brakes A Ne w Riveting Process observed that in each case the ordinary riveting Th e particular problems arising in the braking E BERGUE & CO., LTD., of Strangeways failed by being sheared half through and the rivets of aeroplane wheels have been carefully investi Ironworks, Manchester, who have for being dragged out of the sheets, the holes in which gate d by the Lockheed Hydraulic Brake Co., Ltd., some years been interested in the produc ha d become elongated by the shearing action. of Brock House, Langham Street, London, W.1, tion of light portable pneumatic riveting machines I n the case of the patent rivets, these failed an d various types have been developed suitable of the "squeeze type " for aircraft construction, mainl y by tension, the original flat rivet heads for all classes of aeroplane. hav e recently evolved a new patented riveting being pulled off from the shank. In this connection Owing to the motion of the sprung landing process of particular interest to makers of all- i t is worthy of note that the rivets failed at the wheels, and the distance at which the controls meta l aircraft. junctio n of the shank and the original flat head, at ar e placed from the point of operation, a hydraulic This method, known as " The De Bergue patent which point a small conical depression was present syste m offers the great advantages that flexible countersunk riveting process," offers, it is claimed, in the centre of the original head. This may have connections can be provided where necessary, three distinct advantages over ordinary riveting :— caused weakness as the broken-off flat heads had an d tha t the pipe line can be carried round bends, (1) Lap joints are more than twice as strong a hole through the centre of about 1/32 in. dia etc., with the minimum of difficulty, and with in tension. meter . no loss of efficiency. A further great advantage (2) Petrol tightness is obtained with a single As this central depression in the rivet heads is lies in th e fact tha t th e stress imposed on the under line of rivets (⅝-in. pitc h for 20 gauge). t o be eliminated for all future work, it is reasonable carriage is only the torque re-action of the brakes, (3) One surface is perfectly flat, a countersunk t o estimate the improvement tha t may be effected an d that there is no pull from rods, wires, etc., effect being obtained by the original flat b y the elimination of this depression. such as would occur with mechanical brakes. rive t head being forced into the sheets, Takin g the diameters of the depressions in the Th e outstanding points of this system are high withou t removing metal. rivet heads as 1/32 in., the figures 0·865 and 0·27 efficiency, automatic compensation between all Fo r petrol-tank work, gap machines arc supplied, become 0·975 and 0·304 respectively, or 135 :per shoes, self-lubrication, adaptability, and ease in either portable or fixed ; and for such work as the cent.an d 160 pe r cent . greater tha n for the ordinary installatio n and maintenance. hull plating of seaplanes, where it would bo difficult Th e question of equal and absolutely controlled to use a gap machine, the process can be applied brakin g on each wheel is of such vital importance b y ordinary pneumatic hammers fitted with tools tha t the Lockheed Hydraulic Brake Co., Ltd., of special design. does not recommend servo shoes. They have Th e special rivets used for the process are standardise d the ordinary two shoe type with supplied by Messrs. De Bergue & Co., in all metals, separat e fulcrum pins. a slight royalty charge being included in the rivet Fou r distinct types of operation can be supplied: price to cover the use of the patent. This is, (1) Simple hand control lever operating the two however, outweighed by the fact that for petrol wheels equally. joints about one quarter of the normal number of (2) Hand control as (1) with additional variable rivet s are used, and for other work four rivets will han d steering control. do the work of ten ordinary rivets of the same (3) Main hand control as (1) with steering control diameter . from rudder bar. Th e riveting process itself is claimed to be (4) Foot control for straight braking an d steering. almost as fast as ordinary machine riveting, each rive t being completed by a single stroke of the machine. Continenta l Engines Samples show that the sheets arc flattened to W e are asked t o stat e tha t th e sole representatives gethe r to a degree that would be thought im in th e British Isles for the engines manufactured by possible in an ordinary riveted joint. th e Continental Aircraft Engine Company, described Th e process has possibilities of wide utility in in our April issue, are Godman, Brittain and Nutter, aircraft construction, being applicable to almost Ltd. , of Morley House, Regent Street, W.1 . every riveted component, including corrugated sheet s of Alclad. Th e Clergct Engine Th e following is a copy of a report of tensile test s carried out at the Manchester Municipal I t is regretted that in the article " A French College of Technology on riveted joints by this Diesel Engine," figure 6 on page 54, was wrongly new process, a direct comparison with ordinary described. The illustration shows a connection for rivetin g being given in each case:— th e passage of oil from the tank to the crankshaft. riveting. These calculations are based on the THE MANCHESTER MUNICIPAL COLLEGE OF assumptio n that the strengths of the joints are TECHNOLOGY weakened by the presence of the depressions in Report of Examination of Tensile Strength of Four th e rivet heads in the ratio Small Riveted Joints Submitte d by Messrs. D. Bergue & Co., Ltd., Classified Advertisements Strangeway s Ironworks, Manchester. Eac h joint was approximately 3 in. wide. 2/ - per Line, 2 Line Minimum, Payable in Advance. Th e patent riveting was carried out at the works First Tests of Messrs. Do Bergue & Co., Ltd., the proprietors Hig h tensile steel plates 15/1,000 in. thick, of the patent. The ordinary cup-head riveting each sample being riveted with three stainless wa s carried out at Avro Works, Newton Heath, rivets 3/ in. diameter Firth's F.I. Brand, one b y Messrs. A. V. Roe & Co., Ltd. sample being riveted with ordinary cup-head rivets FOR SALE Th e tests were witnessed by Mr. A. N . Jackson. an d the other with rivets of the "D e Bergue Patent (Signed) H. CARRINGTON, Dobbie McInnes "Farnboro" Electric Countersunk Riveting Process." Materials Testing Laboratory. Indicator, No. G.M.127, complete in box, Breaking load for ordinary riveting = 0·415 ton. Breaking load for Patent riveting = 0·865 ton. good working condition. Apply G. & J. Fro m the above figures the Patent Process A n Ingenious Wheel Weir, Ltd., Cathcart, Glasgow. increases the strength of the riveted joint by I n connection with Mr. Dowry's article on 108 pe r cent. anothe r page it is interesting to note that Second Tests efforts to clean up all excrescences have re Firth' s stainless steel sheets 8/1,000 in. thick, sulted in the adoption of flush-type axle caps on "IMPROVED method of assemblage of each sample being riveted with two stainless machines with high performances. One type of Sheet-metal Plates used in Metallic rivets 3/ in. diameter Firth's F.I. Brand, one unit, developed by the Gloster Aircraft Co., is sample being riveted with ordinary cup-head illustrate d in the figure. This arrangement is in Construction." The owners of British Patent rivets and the other with rivets of the "D e Bergue genious and provides a positive lock. Thumb No. 290624 are willing to enter into working Paten t Countersunk Riveting Process." pressure on the centre portion A pushes th e plunger arrangements for exploitation of the same in Breaking load for ordinary riveting = 0·12 ton. bac k and allows a series of retaining balls to fall Breaking load for Patent Riveting = 0·27 ton. into a groove machined in the plunger. The axle Great Britain. Particulars obtainable from cap can then be immediately withdrawn. In this Fro m the above figures the Patent Process Technical Records Limited, 59-60, Lincoln's typ e the wheel rotates on a sleeve B, mounted on increases the strength of the riveted joint by Inn Filelds, London, W.C.2. th e main axle C. 125 per cent.
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: May 1, 1931
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