US1748576A - Tank and method of making the same - Google Patents

Description

Feb. 25; 1930.

H. P. MERRIAM 1,748,576

TANK AND METHOD OF MAKING THE SAME Fi1ed Aug.15. 192a Patented Feb. 25, 1930 UNITED STATES;

PATENT opmn I HENRY ,ZP. MERRIAM,

or GARBONDALE, PENNSYLVANIA, AssIenoR T nivrnnroan WELDING COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE TANK AND METHOD OF MAKING THE SAME Application filed August 15, 1928. Serial No. 299,861.

This invention relates to metal containers h of a tank showing an end closure or bottom such as tanks for holding gas under hig pressure, and has particular reference to an end closure for tanks.

Gases under pressure, acetylene for example, are commonly distributed in steel tanks which are of varied construction, but the high pressure employed makes it imperative that the tanks be sound and sufficiently strong.

- Many means of closing the tank ends have been devised in an effort to strengthen these portions of tanks, as it is customary to roll the tanks on their bottom edges. When this operation is continually repeated on hard surfaces such as concrete floors, the lower edge becomes deformed and frequently the tanks are rendered unsuited for further use. I

One object of the present invention, therefore, is to provide an exceptionally strong and durable bottomend closure for gas tanks.

A further object of the invention isthe provision of a tank shell having a separate and independent bottom united thereto in such a manner as to become really a part or continuation of the shell.

A still further object of the invention is:

the provision of a tank having a unitary bottom reinforced by a false bottom.

Another object of this invention is the provision of a tank for holding gases under pressure, which tank is provided with a false bottom for reinforcing purposes and for providing an element on which thetank may be rolled. v As another object of the invention,the same contemplates the provision of a tank having a recessed lower end in which is fitted a rolling ring which is secured to the tank shell and which serves to reinforce the. lower end of the tank.

This invention also contemplates the-provision of atmethod of forming the end closure of a tank or the like. e Other objects and advantages of this inven- 4Btion wilbbe apparent from the following descriptiorljtaken with the accompanying drawings, in which:

Figure 1 is a sectional view of the lower end of "a tank'showing the bottom initially, placed in position;

Fig. 2 is a sectional view of the lower end welded thereto and also showing a false bottom or reinforcement in its initial position;

Fig. 3 is a View similar to Fig. 2 but show-,

ing the tank end and its associated bottom crimped over the false bottom; and

Fig. 4 is a sectional view of the completed tank end.

Referring now more particularly to the drawings, Figs. 1 to inclusive disclose the several steps required to form the tank end, and Fig. 4"discloses the completed tank end. As shown clearly in Fig. 4, the tank comprises a body portion indicated at A, the same being a tubular metallic shell 2 having a r e cessed end which is formed by an end closure indicated generally at 4. Secured within the recessed end of the tank is a rolling rin'g indi-' cated generally at B, the end of which protrudes-or extends beyond the end of the shell 2 and said rolling-ring B is retained in. the recessed end of the tank by reason of the fact that the end ofthe tank or shell 2 iscrimped around the rolling ririgms shown clearly at 6.

The rolling ring is preferably of the form shown clearly'in Fig. 4, and comprises in effect an inverted cup-shaped element hav- 1ng an opening 8 in the base thereof, the base being downwardly bevelled as shown at 10 and the bevel terminating in an annular flange 12 which extends into the recessed end of the tank. The rolling ring B is further secured in position by means of internal and external welds 14 and 16 respectively, weld 14 connecting the lower edge of flange 12 with the end closure 4' and weld 16 connecting the end of the tank shell 2 with the rolling-ring above the lower edge of the latter. l The rolling ring is provided with an internal flange 18 adjacent the opening for the purpose of strengthening the ring itself, and the base of the ring is provided with weep holes 20 to permit escape or drainage of any water or forelgn matter which may by anychance collec't within the recessed end of the tank.

first provided which is tubular, as shown 7 clearly in 1, and the end closure 4 is invserted in the end ofthis tubular shell 2 also as clearly/shown in-Fig. 1; the end closure 4 being substantially cup-shaped and provid- 5 ing a concaved base portion 22 and an annular flange, or side wall 24 which is adapted to nicely fit the interior of the shell 2 at the end thereof. The next step in the method of the present invention is to connect or unite the end closure 4 with theshell 2, and this is done ,preferably by flame welding whereby the end closure 4 at the flange 24 is united to form a unitary whole with the end of the shell 2; the union of these two parts being indicated at 26. Obviously, under the influence of a flame weld, the parts are expanded, that is, the end of the shell 2 and the flange 24 of the end closure 4 are expanded due to heat, and while in their expanded position, and prior to coolthe rollingring B is placed in position within the end closure 4, as clearly shown in Fig. 2. The rolling ring having been placed as indicated in Fig. 2, theend of the tank shell and its united flange 24 of the end closure, is then crimped around the flange 12 of. the rolling ring, as shown clearly in Fig. 3, and the parts as so positioned will assume the position shown in F ig; 3 uponthe cooling of the end of the shell 2, the end of the shell 2 and its associated end closure shrinking onto the rolling ring B at the flange 12 thereof.

As the final step in the method of the res-' ent invention, the lower edge of the ange 12 of the rolling ring B is welded to the end closure 4, as shown at 14, and the upper edge of the shell 2 is then annularly welded to the rolling ring B, as shown at 16. The rolling ring B, it will be apparent,

it protrudes or extends beyond the shell 2 to provide a surface on which the tank may be rolled. The rolling ring B also serves as a false bottom and strengthens the lower edge of the shell 2 with its associated closure 4.

It is believed that from the description herein, the construction and operation of the tank of the present invention will be fully apparent to those skilled in the art without further elaboration, but it can be seen that the construction shown and just described provides an end closure for a tank which is extremely strong and durable in operation and which provides a surface on which the tank may be rolled, the rolling ring B being so formed with'its beveled surface that sharp corners are eliminated, thereby preserving thelife of the end closure by the elimination of such sharp corners or edges and providing a surface on which the tank may easily be rolled.

The drawings herein disclose one embodiment of the invention, but it is to be understood that the drawings are merely by way Q of example, and that various changes in the ing, and preferably just after the welding,:

serves to reinforce the end of the tank, and

form andgproportions of the device may be made such as fall within the scope of the appended claims without departing from the spirit of the invention.

What is claimed is:

*1. A tank having an assembled head comprising a shell, 2. bottom for the shell having a side wall fitting within the lower end of the shell and welded thereto, and a false bottom for the shell having a side wall fitting within the shell bottom; said shell and bottom beingcrimped over said second named wall to secure the false bottom.

2. A tank having an assembled head comprising a shell, a bottom for the shell having a side wall fitting within the shell and welded thereto, and a false bottom fitting within the shell bottom; the shell bottom and shell being shrunk onto the false bottom to secure the latter.

3. A tank having an assembled head com-L prising a shell, a bottom for the shell having a side wall fitting within the shell and welded thereto, and a false bottom on which the shell'' bottom and shell areshrunk. 1,.90

4. A tank having an assembled head com- 3 prising a shell,-a bottom welded to the shell and positioned within the shell, and a false bottom fitting within the shell bottom and extending beyond the shell; the edge of the shell and the bottom united thereto being bent over the false bottom to secure the latter.

5. An assembled end closure for tanks comprising a bottom having a side wall fitting within a tank shell and weldedthereto, a false bottom fitting within the first named bottom and welded thereto, the end of the tank shell being bent over the false bottom to secure the latter.

6. In a tank having an assembled head, an end construction comprising a bottom fitting within and welded to a tubular tank shell, and an end reinforcement comprising a false bottom on which the tank shell and bottom are shrunk, and weld metal connecting the shell to said false bottom, said false bottom protrudin'g beyond the shell to provide an inwardly inclined surface-on which the tank may be rolled. 1

7. The method of forming tank ends which comprises inserting a bottom in a tubular shell, heating the shell and bottom to unite and expand the same, then inserting a false W bottom in the first named bottom and crimp- 120 ing the shell end and bottom thereover and finally permitting the shell and bottom to cool to shrink onto the false bottom.

8. The method of forming tank ends which comprises inserting a bottom in a tubular tank shell, flame welding said shell and bottom together, inserting a false bottom in the first named bottom immediately after the welding finall welding the false bottom to the tank shell ottom and to the tank shell.

v 9. The method of forming tank ends which comprises inserting a bottom in a tubular tank shell, welding the shell and bottom together, inserting a false bottom in the first named bottom immediately after the welding and while the welded parts are still at a temperature above normal, crimping the tank shell over the false bottom prior to cooling of the shell, permitting the shell to shrink onto the false bottom, and finally welding the false bottom to the tank shell.

10. The method ofsecuring interfitting inner and outer bottom portions to a container which comprises joining one of the bottom portions to the container by fusion of metal and inserting the other bottom portion before the heat produced by the fusion has dissipated whereby the contraction incident to cooling will shrink the container about the last in serted bottom portion.

11. Themethod of securing interfitting in ner and outer bottom portions to a container which comprises joining the innerbottom portion to thecontainer by fusion of metal and inserting the outer bottom portion before the heat produced by the fusion has dissipated,

whereby the; contraction incident to cooling will shrink the container and the inner bottom portion about the outer bottom portion.

In1 witness whereof I have hereunto set my han PF'MERRIAM.

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