US2017361A - Method of making a metal container - Google Patents

Description

Oct. '15, 1935. J, WERDER 2,017,361

' METHOD OF MAKING A METAL CONTAINER Filed March 9, 1951 IN VENT'OR B Y Jolt: I, Werdw A TTORNEYS Patented Oct. 15, 1935 UNITED STATES I 2,017,361 METHOD OF MAKING A METAL CONTAI NER John F. Werder, Lakewood, Ohio, assignor of onehalf to Edmund Rogers, South Euclid, Ohio Application March 9, 1931, Serial No. 521,227

I 1 Claim. (01. 113-120) withstand substantial internal pressure so that the lubricant may be discharged therefrom under its own pressure.

It is therefore the object of the present inven- {5 tion to devise a method for forming a metal container with suitable form of longitudinal joint which is especially adapted to withstand such internal pressure without danger of the joint being weakened thereby, and without requiring the ne- 5 cessity of re-soldering the joint to correct any failure of the joint as a result of the blowing' process. This process involves the application of internal pressure to the container, corresponding substantially to that of. the gas-charged liquid, 35 for the purpose of pro-forming the body and heads so that their curvature will correspond, so far as possible, with the form which would naturally be given by the force of the internal pressure to which the container is to be subjected.

= This is explained more fully in my United States Patent No. 1,762,903, June 10, 1930.

Other objects of the present invention and the advantages resulting therefrom will appear from the following description and claim when considered together with the accompanying drawing.

Fig. 1 illustrates the old form of internal, interlocking longitudinal joint for a cylindrical container; Fig. 2 illustrates. an exteriorly arranged interlocking longitudinal joint for a metal con- ,0 taine'r which forms part of the invention covered by my United States Patent, No. 1,788,261, issued January 6, 1931; Fig. 3 illustrates a plain overlapping longitudinal joint which is formed by a means which is not well adapted for the purposes 5 now under consideration; Fig. 4 illustrates diagrammatically the present improved forin of plain overlapping or laminated form of joint and the general manner of forming the same; Fig. 5 is an elevation of the apparatus for forming the present 0 improved longitudinal joint; Figs. 6 and 7 are views taken on lines 5-6 and l'l, respectively, of Fig. 5.

- It is to be understood that the present disclosure is merely for purposes of illustration and that 6 there may be devised various modifications without departing from the spirit of the invention as herein set forth and claimed.

Upon charging the old form of container 1 with a fluid under pressure, the force which is exerted equally and radially in all directions by such 5 internal pressure would naturally cause the wall of. the main body of the container to assume a shape corresponding thereto so far as possible, approaching the form of a sphere. The result would be that a certain portion of the main body of 10 the container in the immediate vicinity of the longitudinal joint 2 would be drawn away from the joint and caused to assume a form as indicated approximately by the dotted line 3, as a result of the force of the internal pressure. Thus, the joint would be at least partially weakened and the resulting form and condition of the container in the region of the longitudinal joint would be unsatisfactory unless re-soldered, since it would be apt to permit the escape of the pressure and the contents from the container.

With the above conditions in mind, there'was devised a form of. container illustrated in Fig. 2 in which the longitudinal interlocking joint 4 is located upon the outside of the body 5. As part of the invention relating to this particular form of container, and as set forth in the above United States Patent No. 1,788,261, there was disclosed the procedure of first forming the joint 4 and applying the two end heads thereto, after which the container is subjected to an internal pressure corresponding substantially to that of the gas-charged lubricant which it is intended to contain. Such preliminary application of internal pressure will cause the walls of the container to assume a form-corresponding to that which would naturally be given thereto by the force of such internal pressure as it is exerted radially and equally in all directions. -Then after having subjected the container to such prelimin- 40 ary pressure, the joint 4 can be soldered for the first time, or, if having already been soldered, it

- may then be re-soldered so as to correct any failjoint is old and well known in a general way, as illustrated for instance in Fig. 3. In this particular illustration, the main body of the container 8 has its longitudinal marginal portions overlapping and the strip 1 which is employed to clamp such portions in overlapping position is applied thereto at a point removed from the edge of the overlapping portion 8. This has beenv found to be necessary in order to permit the application of solder between the overlapping portions at the point 8. As a result, the overlapping portions 6' and 8' do not assume a perfectly cylindrical form throughout the region of the joint as they do not even contact each other throughout the entire joint region, and thus it can not be said that the portions 8- and 6 are given a form-corresponding to'the form which would naturally result from the exertion of the internal force upon the inside of the container, as above referred to. Therefore, upon application of such pressure by the introduction of the gas-charged lubricant to the container, the longitudinal joint may be expected to yield to such pressure and there may be expected a failure of the joint with consequent leaking of the contents. Furthermore, this form of joint in Fig. 3 is objectionable for the additional reason that the edge of the portion 6' projects more or less from the main body of the container and there is thus not produced .the smoothest .possible form throughout the entire surface thereof.

' According to the present illustration, the metal body I is extended about an expansible mandrel it so as to assume cylindrical form, and the extreme edge portion of the outer part of the overlapping or' laminated jointis clamped by means of the strip of asbestos ll,while the inner portion of the joint is engaged by the asbestos strip i2 which is mounted in the mandrel. The purpose 1 of the asbestos is to conserve the heat at this point by preventing its escape as would be true by the use of metal strips. The mandrel Hi is expended by means of the wedge i0 which is operated by lever l3 pivotally mounted at It! upon the stationary frame. =The clamping strip II is carried by the arm I which is pivotally mounted at the point I! inthe frame and has pivotal connection 18 with the vertically disposed rod H for actuation by the foot lever l8. Thus, upon operation of the apparatus just now described,

the body of metal 8 will be caused to-assume a cylindrical form throughout the entire region thereof outside of the joint, and the overlapping concentrically arranged portions of the joint will also be caused to assume a form correspondin to the arc of a cylindrical form even to the very edges thereof. Even though there will be re- .quireda slight offset between the overlapping portions of the joint and the remaining portion of the cylindrical body, yet it may be said that the overlapping portions of the joint are arranged concentrically throughout with respect to each otherand in the form of a truly cylindrical arc and the same thing is true of the remaining portion of the body 8. a

The solder may be applied between the overlapping portions of the joint in any suitable manner, as for instance, by preliminarily interposing a ribbon of solder or a solder paste or powder therebetween or by the application of solder through a series of apertures throughout the outer overlapping portion, as set forth in my copending application, Serial No. 521,228, filed March 9, 1931. In either event, the solder is fused by means of a heated iron which may be given proper wiping action along the outside of the joint, and the solder will fill the entire joint region even to the extreme edges of the overlapping portions, and the joint is of proper cylindrical form throughout.

Upon formation of the cylindrical body in the manner just described, the two end heads are applied thereto by soldering the marginal flanges of the same to the end portions of the body I. The container in this condition is then subjected to the blowing" process so as to bulge the heads into the form corresponding to the natural lines of force of the internal pressure of the gascharged lubricant with which the container is to be filled. Due to the present improved form of 20 nection also with' a conical or tapered form of con-' tainr and the following claims are to be so understood=.- In either case, there will be the same of curvature in the body and joint of the container through any given cross section therethrough.

Thus, I have devised a joint in which a film of solder of continuous and uniform extent seals the overlapping portions to the very edge thereof, and without any protruding edges or any other objectionable features.

Furthermore, since there will be no danger of the joint breaking radially with respect to the axis of the container, the danger of any break at all in the joint has been reduced to practically nil since this particular joint is virtually proof against the strain which is exerted circumferentially of the container wall.

Thus, I have devised a simple form of container which is well adapted for the purp se intended and other advantages resulting from the present invention will be obvious to those who are familiar with the art to which it relates.

What I claim is:

The method of making a metal container adapted to withstand substantial internal pressure, consisting in first forming the main body portion with a true circular cross section at any point therealong and the edge portions thereof overlapping each other in the form 'of a plain two-ply joint and arranged concentrically with respect to each other throughout their entire circumferential extentand also with respect to the main body portion, clamping the overlapping joint region including the extreme edge portion of the outer overlapping part of the joint, and then securing said overlapping portions togetheras a permanent joint.

JOHN F. WERDER.

Images