US2214480A - Stovepipe construction - Google Patents

Stovepipe construction Download PDF


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US2214480A US2214480DA US2214480A US 2214480 A US2214480 A US 2214480A US 2214480D A US2214480D A US 2214480DA US 2214480 A US2214480 A US 2214480A
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    • F16L9/00Rigid pipes
    • F16L9/17Rigid pipes obtained by bending a sheet longitudinally and connecting the edges


Se t. 10, 1940. s. SCHECTER I STOVEPIPE CONSTRUCTION Filed Aug. 5. 1939 mlllh I III.
INVENTOR. am J jzec er 2 j i ETORNEY.
Patented Sept. 10, 1940 use STATES anal STOVEPIPE CONSTRUCTION Samuel Schecter, Philadelphia, Pa.
Application August 5,
1 Claim.
The present invention relates to stovepipesin general, and it relates more particularly to a novel stovepipe having an improved self-locking longitudinal seam.
One of the objects of the present invention is to provide an improved stovepipe having a more durable longitudinal seam which may be more effectively and more securely locked with ease, and which may yet be inexpensively produced.
Other objects of the present invention will ap pear more fully from the following detailed description, accompanying drawing and appended claim.
For the purpose of illustrating the invention, there is shown in the accompanying drawing one form thereof which is at present preferred, since the same has been found in practice to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which the invention consists can be variously arranged and organzied and that the invention is not limited to the precise arrangement and or zganization of. the instrumentalities as herein shown and described.
Referring to the drawing, wherein like reference characters indicate like parts,
Figure 1 represents a fragmentary perspective view of a cylindrical blank of sheet metal from which may be formed the improved stovepipe 30 1forming the subject matter of the present inven- Figure 2 represents a perspective view of an unclosed section of the improved stovepipe constructed from the blank illustrated in the preceding figure and having finished longitudinal marginal portions adapted for engagement with each other.
Figure 3 represents a fragmentary perspective view of a closed section of the stovepipe illustrated in Figure 2, with the longitudinal seammarginal portions thereof being operatively locked together.
Figure 4 represents an enlarged sectional perspective VlEW taken through an interlocked portion of the stovepipe seam, such as would be seen for instance on line 44 of Figure 3 looking in the direction of the arrows.
Figure 5 represents an enlarged front elevational view of one of the interlocking projections marginal portions of the stovepipe.
from a sl1eet-n1etal blank lil bent into cylindrical which are pressed out of one of the longitudinal 1939, Serial No. 2sa4s4 (o1. iss 74) form. The longitudinal marginal portions H and E2 of the blank Eli are respectively provided at longitudinally spaced intervals with rectangular apertures I3 and cooperating projections l4, pressed, stamped, bent or otherwise formed out of the sheet--metal blank. The apertures it are spaced somewhat further from the edges of the marginal portion ll than are the projections l4 from the edge of the marginal portion l2, for a reason which will presently appear.
Each of the projections l4 extends radially outwardly, and preferably extends in a direction away from the adjacent marginal edge of the sheet-metal blank iii. In the particular embodiment illustrated in the drawing, the projections M each includean inclined generally trapezoidal surface it so proportioned relative to the rectangular aperture l3 as to fit more or less snugly therein, with the radially outermost edge it of said trapezoidal surface being slightly shorter than the corresponding major dimension of the aperture It, to permit ready entry of the projection M into the aperture l3.
It will be noted that the projection I4 is severed from the sheet metal from which it is struck along one free edge It, with the ends of the trapezoidal surface I 5 being connectedto the sheet metal blank it bymeans of the integral triangular-shaped end-panels I! which are almost perpendicular to the plane of the sheetmetal it. If desired, the projections l4 may be severed from the sheet-metal along three sides, in lieu of merely along the one side shown. In either case, however, edge It constitutes an abrupt well-defined portion which will readily slip into the recess 3 to lock together the marginal portions l i and l2;separation being prohibited by the edge of projection l4 encountering the juxtaposed edge of the aperture l3.
The marginal portion ll containing the apertures i3 is twice folded in upon itself along the fold lines it and I S, to providethe three juxtaposed plies 29, 2| and 22, with fold l9 not be ing quite as sharp as fold l8, so that the plies 22 and 2| are spaced somewhat further apart than are the plies 2i and-20, thereby to provide space therebetween for receiving theopposite marginal portion Ill.
The radially-outerrnost ply 2B is preferably oifsetradially outwardly from the body of the stovepipe with the inclined connecting portion 23 following as far as possible the curved contour of the underlying fold Ill. The radially-innermost ply 22 preferably terminates a substantial distance beyond the fold [8 in a radially-outwardly offset terminal portion 24 with the inclined connecting portion 25 approximating the curve of the spaced fold 18.
The opposite projection-bearing marginal portion I2 is offset radially inwardly with respect to the body of the stovepipe, with the inclined intervening portion 26 being bent to fit more or less snugly between the fold it and the radially inwardly spaced inclined portion 25.
After the marginal portions have been bent as above described, the resultant stovepipe resembles that illustrated in Figure 2, with the projection-receiving apertures l3 being located along the intermediate marginal ply 2i and being completely concealed by the juxtaposed inner and outer plies 22 and 28, respectively.
The longitudinal marginal portions of the blank I may be readily permanently interlocked by merely inserting the edge 21 of the right-hand marginal portion l2 intermediate the juxtaposed plies 2| and 22 of the left-hand marginal portion II, and then sliding portion l2 home, where it assumes the position illustrated in Figure l. During this sliding movement the panels 2i and 22 will be sprung slightly apart until the sharp edge l6 of the locking projection M has cleared the trailing edge of the aperture l3 and the inclined portion 26 has nested within the juxtaposed inclined portion 25, whereupon the plies 2| and 22 will spring back substantially to their former positions, snapping the projections l4 into their cooperating concealed apertures l3.
The resultant longitudinal seam is extremely durable, possessing great structural strength, and
the marginal portions forming said seam are permanently interlocked in an extremely effective manner, and Without the presence of visible securement means. Thus, the interlocked marginal portions H and I2 are secured against separating transverse movement by virtue of the free edge [6 of the projection l4 abutting the adjacent juxtaposed edge of the aperture 53, and relative longitudinal shifting of the interlocked marginal portions II and I2 is prohibited by the presence of the outwardly extending triangular end portions H on the projections M, which encounter the immediately adjacent juxtaposed short edges of the apertures I3.
It Will also be noted that when the marginal portions II and I2 are operatively locked together, the leading edge 21 of the right-hand marginal portion l2 substantially abuts against the fold IQ of the left-hand marginal portion l I, thereby limiting further movement in a seamclosing direction.
By virtue of the foregoing construction, an improved stovepipe is afiorded wherein movement of the interlocked portions comprising the longitudinal seam is prohibited in all directions, by juxtaposed well-defined edges and/or surfaces which cannot slide or work their way past each other, and all this is achieved in a relatively sim ple and inexpensive manner, and by concealed means which do not project beyond the seam either interiorly or exteriorly thereof.
The present invention may be embodied in other specific forms Without departing from the spirit or essential attributes thereof, and it is therefore desired that the present embodiment be considered in all respects as illustrative and not restrictive, reference being had to the appended claim rather than to the foregoing description to indicate the scope of the invention.
Having thus described the invention, what is hereby claimed as new and desired to be secured by Letters Patent is:
In a sheet-metal stovepipe having two meeting longitudinal marginal portions, one of which marginal portions is twice folded upon itself to provide three overlapped plies with the outermost and innermost plies imperforate, and the other marginal portion projecting between the innermost and the intermediate of said three overlapped plies, means for locking said other marginal portion between said innermost and inter mediate overlapped plies, said locking means including a plurality of longitudinally spaced outweirdly-extending projections on said second marginal portion terminating in free cut longttudinal edges and being generally elongated and having generally abrupt un-cut end-shoulders, corresponding apertures in said intermediate ply in registration with said outwardly extending projections and adapted fully to receive and house said projections, said apertures having longitudinal edges in interlocking relation to the free-cut edges of said projections and having end edges in interlocking relation to said end shoulders of said projections; said innermost ply and said other marginal portion being similarly offset to form corresponding generally continuous interlocking longitudinal shoulders.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2463593A (en) * 1945-06-28 1949-03-08 John H Boardman Seamed pipe lock
US2634761A (en) * 1953-04-14 Lock seam for pipe sections
US3034209A (en) * 1956-07-31 1962-05-15 Bianca Edoardo Giuseppe Method of making tapered tubular sections
US3295560A (en) * 1965-03-18 1967-01-03 Louis F Demmler Snap lock sheet-metal seam
US5499726A (en) * 1994-04-05 1996-03-19 Mitchell; Patrick J. Multiple-height modular display pedestal for displaying merchandise

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2634761A (en) * 1953-04-14 Lock seam for pipe sections
US2463593A (en) * 1945-06-28 1949-03-08 John H Boardman Seamed pipe lock
US3034209A (en) * 1956-07-31 1962-05-15 Bianca Edoardo Giuseppe Method of making tapered tubular sections
US3295560A (en) * 1965-03-18 1967-01-03 Louis F Demmler Snap lock sheet-metal seam
US5499726A (en) * 1994-04-05 1996-03-19 Mitchell; Patrick J. Multiple-height modular display pedestal for displaying merchandise

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