US251896A - Attaching bottoms and tops to sheet-metal vessels - Google Patents

Description

(No Model.) y

. G. W. KNAPP.

ATTAGHING BOTTOMS AND TOPS To SHEET METAL vEss LE. No. 251.896. 'Patented'Jan. 3,l882.

Win/asses Jnrenibof:

' Fig. 3 is a side view'of same finished. Fig. 4

, the construction of seams for uniting the bot- UNITED STATES GEORGE W'. KNAPP, OF'BALTIMORE, MARYLAND.

PATENT OFFICE.

ATTACHING BOTTOMS AND TOPS TO SHEET-METAL VESSELS.

SPECIFICATION forming part of Letters Patent No. 251,896, dated January 3, 1882.

Application filed September 27, 1881. (No model.)

To all whom di may concern.-

Be it known that I, GEORGE W. KNAPP, a citizen of the United States of America, residing at Baltimore, in the county of Baltimore and State of Maryland, haveinvented certain new and useful Improvements in Attaching Bottoms and Tops to Sheet-Metal Vessels; and 1 do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanyingdrawings,and to letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to an improvement in toms or tops to the bodies of sheet-metal vessels. The particular nature of the improvement and the practicalapplication ot the same to various descriptions of sheet-metal vessels will first be described,and then the invention will be designated in the claims.

In the drawings liereto annexed,Figure 1 is a vertical section of a flaring pan. Fig. 2 is a partly-sectional view of a cylindrical vessel previous to the attachment of the bottom.

is a side view of a can-body ready for the attachment of the bottom and top. Fig. 5 is a vertical section of a vessel, showing a modification in the shape of the parts which form the scam, the parts being in position ready for forming the seam. Fig. 6' is a partly-sectional View of same finished.

The letter A designates the body of the vessel, which may be flaring, like the pan shown in Fig. 1, ora straight-sided cylinder, such as is shown in the other figures. An annular groove, b,is formed upon the outer side of the body of the vessel, about the edge where the bottom is to beattached. This grooveis formed by rollers, which press the part where the groove is formed within the plane of the outer wall of the body, as shown in Figs. 2 and 4, and thus forms upon theinnersideof thehody an inward projecting shoulder, a. By this means the inner diameter of the body where the bottom is to be attached is lessened to an extent equal to just double the dimensions of theinward-pressed groove,considered in crosssection; and this lessening of the internal diameter of the body and the formation of the exterior groove allows the useot' acorrespondingly smaller bottom, as will be seen.

The bottom E is a sheet-metal diskst-amped up in such form as to leave a radially-project ing flange, e, and an annular shoulder, f, adjoining the radial flange. Theannularshoulder should have such form as will correspond to or coincide with the form of the inner side part of the inward-projecting shoulder 0 on the body. The bottom is placed in position with its annular shoulder setting within the end of the body of the vessel and in contact with the rounded edge of the inward-projectin g shoulder. Fig. 2 shows the body and bottom in the position just described. These parts are now chucked in a lathe, and by means of a suitabl y grooved roller, G, which is brought to bear against the radially-projecting flange 0 while the vessel is turning, the said flange of the bottom is rolled or spun over into the groove b of the body, as shown in Figs. 1 and 3, and occupies the said groove in the form of a roll.

By this construction of the joint a cheap quality or low grade of tin may be used withoutliabilit-yot' breaking the sheet metal,as the form of the flange when finished-thatof a roll--and the necessary operation to produce that form are very easyon the sheetinetal; and in this roll form of flange and the groove into which the roll is turned or fitted there is no exposure of the raw or cut, edge of the bottom or top, since it is turned entirely inward toward the body. l urthermore, a slight saving is efi'ected in the size of the blank from which the bottom is cut. and by thus cutting a smaller blank from the sheet-tin a larger number of bottoms may be got out of each sheet, which results in a very important economy in manufacturing large numbers.

Another advantagein cylindricalorstraightsided work, like fruit-ca.ns,lies in the fact that no part ofthe beaded seam or the turned-over flange ot' the bottom ortop extends beyond the plane of the outer wall of the body, (see Fig. 3,) and cans or vessels possessing this feature pack for shipment to great advantage in cases or boxes.

A modification in the form of the seam is I shown in Figs. 5 and 6, where the groove as first fonned in the body is square or angular in cross-section, instead of semicircular. In this form of groove the radiallyprojecting flange is first rolled or spun over bya grooved roller or other device until the edge of the square-shaped groove has also been partly turned up, and then by the application of a flatfaced roller the beaded seam is flattened down and compressed within the square shaped groove, so that, as in the case of the beaded seam of the semicircular groove, no part extends beyond the planeot' the outer wallof the body. (See Fig. 6.)

It will be understood my invention is applicable to vessels which have either or both hottoms or tops to be attached, and to vessels which are small at the bottom and time outward at the top, like that shown in Fig. 1,0r

desire to secure by Letters Patentof the United States 1. A sheet-metal vessel with its head or end i and of the body, substantially as shown and described. I v

2. A sheet-metal vessel with its head or end joined to the body by a coiled seam, this seam being so located and placed that a portion of it shall be embraced within the lines of the headand the body and occupy a space in the interior of the vessel, substantially as shown and described.

In testimony whereof I at'fix my s gnature in presence of two witnesses. i

' GEORGE W. KNAPP.

Witnesses:

' CHAS. B. MANN,

W. A. NUMsEN.

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