US1253902A - Stovepipe. - Google Patents

Description

K. W. STEINHART.

STOVEPIPE.

APPLICATION FILED MAR. 13. I9I7.

Patented Jan. 15, 1918.

WITNESSES f/zg w ATTORNEY KURT W. STEINHART, OF TACbMA, WASHINGTON.

STOVEPIPE.

W. STEINHART, at

pipe section from a rectangular sheet of metal so that the finished section shall have an improved form of scam between the edges of the sheet.

This object is carried out in the manner hereinafter more fully described and claimed, and as shown in the drawings wherein Figure 1 is a plan view of a stove pipe section made in accordance with my invention, showing its bell end partly broken away and the male end of an adjacent section inserted therein.

Fig. 2 is a perspective detail of the female end of one section, and

Fig. 3 is a perspective detail of the binder for contracting t e bell end of the section as explained below.

Fig. 4 is a perspective detail of this end of the section with the edges of the sheet bent into position ready to be connected, but not yet quite connected.

Fig. 5 is a transverse section on an enlardged scale taken on the line 55 of Fig.1; an

Fig. 6 is a sectional detail on the line 6-6 I of Fig. 5.

Fig. 7 is a plan view of the blank from which one of these improved stove pipe sections is made.

In Fig. 7 of thedrawings the numeral 1 designates a blank of sheet metal from which one of my improved stove pipe sections is to be made. This blank is substantially rectangular, being of a'width to give the appropriate circumference to the finished section, and of a length measuring about twenty-two inches because that is the standard length of stove pipe sections now on the market. Nevertheless, I do not'wish to be limited to the measurements, nor as to the material or its finish. This blank is to be constructed in such way that when its edges are brought together and connected into a section of stove pipe, one end of the latter will be contracted slightly so as to Specification of Letters Patent.

Patented am. 15, 1918',

Application filed March 13, 1917. Serial No. 154,585.

constitute the male end and the other end will be of such size as to slip over the male end, so that in effect it is the female end or bell end of the section; and, adjacent each end 1s stamped a bead whose outer projectlon const1tutes arib near the male end and whose inner side'constitutes a groove near the female end. These beads are respectively numbered 2 and 3 in the drawings, and need not now be again referred to. The

lower end of the blank 1 shown in Fig. 7

is crimped or corrugated as at 4 so that eventually it may be reduced as seen at 5 in Fig. 1. At one end of the corrugated portion, whlch will be at one edge of the blank, is out a hole or opening 6, and in the other end is out a V-shaped slit producing a triangular key 7 which eventually will engage said opening 6 to hold the extremity conical as seen at 5 in Fig. 1. Beyond the corresponding bead at the other end of the blank 1, the metal for the entire width of the blank is left plain .as shown, but at the corners of the blank it is cut off oblique as at 10 to produce a V-shaped notch 11 as seen in Fig. 2, and at the edges of this notch at the end of the blank are left lips 12 which are bent outward in the finished article as seen inFigs. 2 and 4. Coacting therewith is a binder 13 best seen in Fig. 3, whose body is of substantially triangular shape with converging lips 14 along its side edges bent inward at angles slightly acute to the plane of its body. When now the female end ofone section is engaged over the male end of the next section, it is quite possible that in pushing the sections together until the rib and groove respectively engage, this end of the section will be strained open a little, and in order to draw it again into its proper position the binder 13 is applied and its lips 14 engaged with the lips 12 and then the binder moved outward as indicated by the arrow in Fig. 1. The result will be that when the binder reaches its final position as here indicated, the engaging lips will draw the bell end of one section closely around the body of the next adjacent section, while the heads will hold them together.

The seam for this improved pipe section is made u of male elements along one edge of the b ank interengaging with female again and reversely bent on the line 22 to produce a flap 23, and said leaf is pierced with a number of holes or slots 24, preferably substantially square as shown. Along the right edge of the blank are cut pairs of L-shaped slits 25 producing interposed T- shiiped keys 26 each having a narrow neck 27 uniting it with the body of the blank and a substantially square head which is alittle wider than the corresponding width. of the hole 24 so that the side edges of the head must be bent up as seen at 28 in Fig. 4 in order that the head may pass through the hole. In forming the blank, the dies may be such as will cut out the holes and the slits and erhaps will score the blank along the fold ines 20 and 22; and erhaps also the dies may be such as will end up the edges 28 of the keys 26 as already described. Now when the pipe section is to be made,

' the blank is bent and its edges drawn toward each other as seen in Fig. 4; and eventually each key is passed, through its respective hole or slot so that when the parts are flattened out as in Fig. 6 the edges 28 will be expanded beyond the corres onding edges of the slot and the key will ecome locked therein. In so fiattemng out the parts by means of suitable tools and machinery not necessary to describe herein the leaf 21 is folded down onto the body of the blank with the edges of the keys beneath it, and the flap 23 is folded down onto the shanks or necks 27 of the keys and the leaf 21 between them. Thus is produced an extremely fine seam between the meeting edges of the blank, and the connecting portions of this seam may not be seen from the exterior as will be obvious from an inspection of Fig. 1. The side edges of the blank can not move on each other relatively, to either contract or expand the size of the section or to bring said edges out of relative alinement with each other in any direction.

When this scam is employed in connection with the male and female ends of'the stove pipe section already described, an article is produced which is extremely serviceable, ready for immediate use, and withal practical and chea to make. A special feature of utility whic 1 the flap possesses, is that it covers the raw edges 28 of the keys and the necks 27 thereof and all irregularities which would otherwise project into the interior of the pipe section, and therefore a cleaning instrument such as a brush ma besubse- 'quently forced through said section without catching .on any projections. I might say in closing that it would be possible to use this improved seam on longer pipe sections such as those used for spouting or in other places where sheet metal is appropriatefor the pipe material and anabsolutely water-H ti ht seam is not required.

hat is claimed as new is 1. In a sheet-metal pipe section, a seam for uniting the edges 0 the blank, the same comprising a flap along one edge of the blank having spaced openings rectangular in shape, and correspondingly spaced T- shaped keys along the other edge of the blank whose necks are integrally connected with such blank and whose heads are transversely longer than the width of said openings whereby they must be bent slightly to pass through the openings, for the purpose set forth.

2. The herein described seam for sheet -metal pipe sections and the like, the same In testimony whereof I. aflix my signature.

KURT W. STEINHART.

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