US2373038A - Process of making reinforced gas flasks - Google Patents

Description

C. H. LINDSAY PROQESS OF MAKING REINFORCED GAS FLASKS April 3, 1945.

Filed March 3, 1943 E E: =5:E

Patented Apr. 3, 1945 UNITED STATES PATENT OFFICE 2,373,038 PROCESS OF MAKING REINFORCED GAS FLASKS Charles H. Lindsay, Elmira, N. Y. assignor to American-La France-Foamite Corporation, Elmira, N. Y., a corporation of New York Application March 3, 1943, Serial No. 477,899 1 Claim. (Cl. fill- 14832) The invention relates to containers or flasks By the present invention the wrapping process for holding gases under pressure, such as liquid is so simplified and shortened that the job can oxygen, etc., and includes a new method of be completed in about one-half of the least time applying wire wrappings to such flasks to increase heretofore required, and on a regular quantity their strength and render them proof against production basis, and without sacrificeof any adfragmentation it struck by missiles in war-rare, vantage; in fact, it is done with some saving of also the flasks so made. material since the applied flanges are not used.

It is already known to reinforce gun barrels, The new process isillustrated diagrammatically gas flasks and the like in this manner. The in accompanying drawing, Fig. 1 showing the usual operation is to wind the wire on the flask lo flask wrapped and the ends of the wire anchored. by rotating it like a spool. or bobbin, laying the ready to be prepared for dipping. Fig. 2 illussuccesslve spires close .together or in contact and trates the completed flask, and Fig. 3 a fragthereafter covering the wrapping with a coating mentary, greatly enlarged scale section of a of metal, which is done by dipping the wrapped wrapped and coated flask.

- flask in a molten bath of tin .or other suitable According to this invention, instead of passing metal or alloy. The coating locks the spires on the beginning end of the wire through a hole the flask making a container of great strength in an applied flange, when starting the winding,

in proportion to its weight. The wire is of high I clamp such end directly in the chuck I of the tensile strength, sometimes called music wire, winding machine, by which the flask is gripped to and is dimcult to handle on account or its stiff be rotated. This makes the chuck a temporary sprlnginess on which account the process of makanchorage for starting the winding. By the acing a neat wrapping with neatly finished termition of the machine which rotates the chuck and nations is dimcult and time-consuming. flask, the wire is then wound quickly over the The practice is to alflx two circumferential neck part or the flask as indicated at 2, conflanged rings to the cylindrical flask body before tinued on over the cylindrical body of the flask starting the winding, one near each end. These in the usual way and, as indicated, down to the are to serve as the limiting boundaries for the opposite end where the wrapping is to terminate, wrapping and as anchorages for the two ends of usually at the base of the cylindrical part. the wire, to hold them until the flask canbe Then, with the machine stopped and, while dipped. They are usually made as split rings of still retaining the winding tension in the wire. L-shaped section and appropriately attached to the terminal spires of the winding at each end the chucks of the winding machine to retain the are fastened or anchored to the flask by brazing positions on the flask to which they have been slew of them together, as indicated at the points set. The winding is started by passing the begin- 4 and I, and by means of a brazing or soldering fining end of the wire through a hole in one of alloy specially selected for the purpose.

the flanges and then rotating the flask so as to The special feature of this alloy is its fusion wind on the wire up to the flange of the ring point, which is enough below the critical temperat the other end. When this is done and while ature of the alloy steel of which the flask wall wi s still e d u er its strong winding is made that it can be used to make the wire tension the flanges are turned down over and 40 junction without imparting a temperature to the upon the adjacent spires of the wire so as to clamp steel wall which exceeds or dangerously apit against uncoiling or slipping. Aloosely wound preaches that temperature. Different steels wrappingis not an effective reinforcement. The have diflerent critical temperatures but all of wire ends are then trimmed oil and the flanges those used for flask manufacture are unaffected wil wn W the pires to make a neat job, by locally applied temperatures lower than 1250" whereupon the flaskis dipped in the molten bath ll". At the same time the fusion point of the to complete the operation. The flanges serve no brazing compound is sufllclently above the purpose, except to determine the beginning and temperature at which the bath of dipping metal end of t w ing and prevent un iling until is maintained, that once the junction or anchorthe dip-coat can be applied, and althou h afte age of the terminal spires has been accomplished. d ppin h y b ome ntegral parts of the flask such junction will not be thereafter impaired or coverlnaheing or soft metal or brass. they add weakened when the wrapped flask is dipped. The little to its tensile strength. They are in fact bath temperature need not exceed, say about 600 A subject to iniury resulting in a loose wire Eat which point tin and its alloys are sulflciently fluid for effective coating results. Suitable braz- 2 aavaoaa ing compounds. including in this term hard or flask with a second mersely-woimd layer on:- silver solders. are available on the market. lying the first, in the same manner, this is n01 A strip 01' such a compound iusible within the necessary ii a single wire orappropriate diametel range indicated, say at 1171i 11"., is slipped under is tightly wound and securely anchored prior to or laid on top or a few or the terminal spires dipping. at each point 4 and I, and then melted by the riskoi' wire-slipping duringtheooating operation. localized application of heat, as by a handand equally important. during the handling ol torch, an electric are or more conveniently. the the flask while being transported from the windtongs of an induction heater, thus permanently ing department to the dippin department. A!- anchoring the two ends or the wrapping wire in tor dip ing. the risk or slipping is or course over. position. The heat applied for this purpose is I claim: momentary, and even though it might involve The process of producing wire-wrapped flasks a temperature somewhat above the indicated h a iti a s e which omprises setting fusion range, is always sai'ely belowvthat which the flask between chucks in a winding machine might alter the crystal structure or the alloy steel whereby it can be rotated on its longitudinal or the flask to afl'ect its strength. axis, fastening the end or the wire to the machine The next steps involve the release or the tension so as to lay the wire against the surface of the on the lead 6 of the winding wire and the cutting flask in the position of the initial spire or the on or the wire ends close to each anchorage winding to be wound thereon, rotating the flask point, 4 and ;I, and finally the dipping oi. the to wind the wire around the samev under tension flask in the molten bath of tin or other coating and so as to envelope the flask with the winding. metal. anchoring the initial spires oi the wire to the The flask then appears as indicated in Fig. 2 flask wall by brazing a few of them together by with the wrapping wire 3 completely coated, and means of a brazing alloy having a fusion point each cut end of the wire covered over and conwell below the critical temperature of the flask cealed in the metal coat. This is indicated, steel and using the brazing heat so momentarily lng usually in the order of .034 inch. Since the some of the last wound spires oi the wire to the pp ng thus made has no spun-over flan es at flask wall in the same manner as above preits ends the overall flask diameter has not been scribed tor the initial spires, cutting 08 the free increased by the winding process greater than ends 01' the wire beyond the brazed spots and then the thickness or the wire and its thin tin coat dipping and coating the wound flask in a molten l, and the flask is therefore virtually unchanged I metallic bath while maintaining such bath at a from its original dimension. temperature lower than the fusion point or said While it is, of course, apparent that the windbrazing alloy. ing could, if desired, be continued to cover the CHARLES H. LINDSAY.

Images