US2947303A - Construction for intermediate wall vent pipe - Google Patents

Description

Aug. 2, 1960 s. EPSTEIN C'DNSTRUCTION FOR INTERMEDIATE WALL VENT PIPE Filed March 10, 1958 ill/ SA UL E PS TE IN! INVENTOR.

HERZ/G 8 JESSUPr ATTORNEYS.

CONSTRUCTION FOR INTERMEDIATE WALL VENT PIPE Saul Epstein, 2332 Nottingham Ave., Los Angeles 27, Calif.

Filed Mar. 10, 1958, Ser. No. 720,239 4 Claims. (Cl. 126-307) This invention relates to an improved triple wall vent pipe construction and particularly to an improved lower end construction for an intermediate wall of a triple wall vent pipe for a pre-fabricated chimney.

The construction of the lower end of the intermediate pipe also is of paramount importance for a safe and secure chimney installation because it is positioned near the hot inlet end of the inner or flue gas pipe for entry of the hot flue gases. In addition to being low in cost, the lower end construction of the intermediate pipe should provide openings through its walls for the passage of air between the inside of the outer pipe and the inside of the intermediate pipe. Furthermore, there preferably should be a minimum of contact between the intermediate and inner or flue gas pipe at their lower ends where the flue gas pipe is quite hot.

Accordingly, it is an important object of my invention to provide a rugged and durable intermediate wall vent pipe construction at the lower end thereof designed for rapid and efficient manufacture by the use of low cost mass production methods, and equally eflicient and rapid assembly.

Another object is to provide a lower end construction for the intermediate wall of a triple wall vent pipe involving a minimum of contact between the intermediate wall and the flue gas pipe and containing openings for the passage of air between the inside of the outer pipe and the inside of the intermediate pipe.

A further object is to provide a safe and secure intermediate wall construction of low material and installation cost as part of a pre-fabricated chimney designed to take the place of the conventional brick and mortar or masonry.

The objects of this invention include the provision of improvements in prior art constructions heretofore intended to accomplish generally similar purposes.

Additional objects will become apparent from the following description.

Stated in general terms, my invention comprehends an intermediate wall construction for a triple wall vent pipe wherein the intermediate wall comprises a series of annular spaced slots, preferably cut through the intermediate wall near the lower end thereof, and having vertical wall members or portions between the slots to space the slots and support the intermediate wall above the slots, and radial members or portions extending from the vertical members to space the outer wall of the triple wall vent pipe from the intermediate wall.

A more detailed description of a specific embodiment of my invention is given below with reference to the drawing, wherein:

Figure 1 is a vertical sectional view showing the lower end of the triple wall vent pipe including the intermediate wall construction supported on a hangar attached to a pair of adjacent joists;

Figure 2 is a cross-sectional view taken on line 2-2 of Figure 1 and showing slots, vertical spacer members between the slots and radial members extending from the vertical members; and

Figure 3 is a perspective view showing the lower end of an intermediate wall construction including the slots, vertical spacer members and radial members.

In the specific embodiment of the intermediate wall construction shown in the drawing, slots 12 are cut through the wall of the intermediate pipe 13, as best shown in Figure 3. The slots 12 are spaced annularly around the lower end of the pipe 13 by suitable widths of vertical wall portions 14 to support the weight of the pipe above the slots.

A major portion of the wall material cut out in forming the slots 12 is removed from the wall of pipe 13 by cutting through one end 15, an upper side 16, and a lower side 17, but the other end is not cut through. Instead, the three-sides cut-out material is bent outward radially from the pipe 13 along the uncut end 18, and cut off at the outwardly projecting end 19. The width of the resulting radial member 20 is made equal to the intended spatial distance between the intermediate pipe 13 and the outer pipe 21, as best seen in Figure 2.

The intermediate pipe 13, outer pipe 21 and inner pipe 22 can be made, for example, of about #28 gauge galvanized iron. It will be noted that the intermediate pipe is not joined to the outer pipe 21, inner pipe 22 or hangar 10. This results in lower construction cost than in the case of prior art constructions employing such joints, and at the same time minimizes contacts over which an objectionable amount of heat transfer. takes place.

Any appropriate number of slots or openings 12 can be utilized within permissible limits of spacing.

Sometimes it is advantageous to have the spacers 20 engage at their edges 19 only with an annular bead or abutment 25 provided in the intermediate pipe 13. Other times it is desirable to taper all or only e.g., the lower ends of the edges .19 as at 26 so that the vertical or axial insertion of the intermediate pipe 13 within the outer pipe 21 is facilitated. Likewise in some instances it is preferable to notch the edges 19 as at 27 so that the same may act as a detent in cooperation with the head 25 to position the intermediate pipe within the outer to insure easier handling and more accurate assembly. Line contact of the edge 19 with the pipe 20 is thereby additionally achieved.

If desired, the spacing ears 20 can be turned both radially inwardly and radially outwardly to space the intermediate pipe from both inner and outer pipes. And, as required, the spacers can be formed anywhere along any of the pipes, inner, intermediate or outer.

The formation of said spacers or ears 20 likewise as noted provides, without further cutting, forming or addition of materials or labor, suitable openings 12 in the intermediate pipe wall so that a satisfactory thermosyphoning flow of cooling air is circulable therethrough. The capacity of said openings is easily sufiicient to accommodate the full flow capacity of the interspaces between the outer pipe 21 and the intermediate pipe 13 on the one hand and between said intermediate pipe 13 and the inner pipe 22, on the other. In addition, the spacers act as reinforcements to attain necessary vertical rigidity of the inter-opening wall portions or pillars 14.

When the pipes are otherwise suitably spaced at their lower ends in a hanger such as 10 a highly satisfactory and secure triple wall vent pipe structure results.

While I have herein shown and described my invention in what I have conceived to be the most practical and preferred embodiment, it is recognized that departures can be made therefrom within the scope of my invention, which is not to be limited to the details disclosed herein, but is to be accorded the full scope of the claims so as to embrace any and all equivalent structure.

Havingadescribed my invention, what I claim as new and desire to secure by Letters Patent is:

1. An intermediate wall construction for a triple wall vent pipe comprising a series of annularly spaced slot Wa qsiti ne r s iacent the wer. nd f e inter-l the-intermediate wall, the outer ends of said radial memhers and said outer wall; having interlocking portions for locking said intermediate and outer walls against relative e t itu na o emen 2-. Antintennediatel wall construction fora triple wall vent pipe comprising a series of annularly spaced slots cptgthrough the intermediate Wall adjacent the lower end thereof, vertical members integral-with the intermediate wall retained between theslots for spacing the slots and supporting the intermediate wall adjacent the slots, radial members integral with the vertical members and extending, therefrom for spacing the outer wall of the triple wall'ventpipe-lfrom the intermediate wall, the outer ends of said radial members and said outer wall having resilient interlocking portionstor releasably locking said intermediate and outer walls against relative longitudinal movement.

3. An intermediate wall construction for a triple wall vent pipe compr si g an intermediate wall having a plurality of circumferentially spaced slots cut there? through adjacent the lower end thereof, said intermediate wall having vertical portions integral therewith between the slots for spacing the slots and supporting the intermediate wall adjacent the slots, said intermediate wall having integral radial members extending from the verti cal portions, said radial members having edge portions contiguously engaging the interior of the outer wall so as to space the outer wall from the intermediate wall, said outer wall having a circumferential inwardly extending bead and said radial memberseach having a notch in its edge engaged with said bead for holding the parts in position.

4. A method of fabricating a triple wall vent pipe construction comprising formingv circumferentially spaced cutouts in the lower partof the intermediate pipe, the cutouts having a portion remaining integrally attached to the intermediate -pipe, bending the material of'the cutout radially outward from the material of the intermediate pipe, cutting off a portion of the material of the cutout at a point spaced from its integral attachment to the intermediate pipe, juxtaposing the outer edges of the remaining portions of the cutouts against-the interior of a third wall of the vent pipe. to space the, walls. apart,

forming a circumferential inwardly extending head in the lower part-,ot the outermost pipe, forming notches ,in the outer edges ,0f-,the radially extending remaining porticns oflthe c utouts apd fittingthesaid bead into'the said,

notches References Cited, in .the file of this patent UNITED STATES PATENTS Great Bri t ain Feb. 14, 1929

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