US499854A

US499854A - Hot-air pipe

Info

Publication number: US499854A
Authority: US
Publication date: 1893-06-20
Anticipated expiration: 1910-06-20

Description

(No Model.)

J. P. SOHAFFER.

. HOT AIR PIPE. No. 499,854.

Patented June 20, 1893.

INVENTOR a-MO WITNESSES 7% Q5 mom-umou wAsnmmoN, n. c.

.Air Pipes; and I do hereby declare the follow- UNITED STATES I PATENT Grates.

JOHN P. SCHAFFER, OF PITTSBURG, PENNSYLVANIA.

HOT-AIR PIPE.

SPECIFICATION forming part of Letters Fatent No. 499,854, dated June 20, 1893.

Application filed August 20. 1892.

To all whom it may concern.

Be it known that I, JOHN P. SOHAFFER, a resident of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Hoting to be a full, clear, and exact description thereof.

My invention relates to hot-air pipes. The style of hot-air pipes most commonly employed for conveying heat from hot-air furnaces tothe different apartments of buildings consists in a pipe having an inner hotair flue and an outer air-flue, the outer airflue surrounding the inner hot-air flue and acting to prevent the hot-air flue from coming into direct contact with any inflammable material.

The object of my invention is to provide a simple yet sure and efficient means of connecting the several lengths of such hot-air pipes.

My invention consists, generally stated, in a hot-air pipe having an inner hot-air flue and an outer air-flue, one end of said pipe having a separate thickness of metal extending from the outer walls of said outer air-flue up over the edge of same, passing down close to the inner face thereof, thence up beyond the edges of said pipe sufficient distance to form a tongue or extension around the top of said pipe, thence down again between the walls of said outer air-flue and up over the edge of the inner wall of said pipe and down over the same a short distance, said tongue or extension on said separate thickness of metal being perforated; the opposite end of said pipe having a seat formed between the inner and outer walls, whereby the perforated tongue or extension on one end of said hotair pipe is adapted to enter the seat of the preceding orsncceeding section as the case may be and be supported thereby.

To enable others skilled in the art to make and use my invention, I will describe the same more fully, referring to the accompanying drawings in which- Figure 1 is a perspective view of a hot-air pipe broken away. Fig. 2 is a vertical section of a hot-air pipe with my invention applied thereto. Fig. 3 is an enlarged end view Serial No. 443,617- (No model.)

showing the separate thickness of metal in the seat of the next section.

Like letters indicate like parts in each.

- The hot-air pipe at is one of ordinary construction having the inner hot-air flue b and the surrounding or outer air-flue c. To retain the inner hot-air flue b within the outer air flue c in proper alignment and to provide for connecting together several lengths of such pipe, the separate thickness of metal (1 is employed. This separate thickness of metal (1 extends from the outer face of the walls 0 of the outer air-flue 0 up over the edge of said wall and down close to the inner face thereof. From this point the said separate thickness of metal 01 extends up above the edges of the pipe for a suitable distance when said metal is bent over to form the tongue or extension e and then passes down adjacent to the outer face of the wall b of the inner hot-air flue b and'u p over the edge of said wall I) and down the inner face thereof. This separate thickness of metal may be soldered to the inner hot-air flue and outer air-flue at suitable points to retain said separate thickness of metal securely in place. The tongue or extension e is perforated to form the openings e whereby air can pass from the air-flue of one section to that of the next succeeding one when several sections are joined together. The pipe at is further provided at the opposite end with a seat whereby when two or more sections of pipe are to be connected the tongue or extension e of one section is adapted to engage with theseat of the preceding or succeeding sec-.

tion as the case may be. This seat may be of any suitable construction, that shown being well adapted for the purpose, and which consists of a separate thickness of metal f extending from the outer face of the wall 0' of the outer air-flue up over the edge of the same and then inwardly between the Walls 1) c, and then up over the edge of the wall 1) whereby a channel or trough-shaped seat is formed to receive the tongue or extension 6 of the separate thickness of metal d. The

tongue or extension e fits snugly within the seat formed for it by the separate thickness of metal f and for this reason said seat is made to conform in shape to that of the tongue or extension which may be curved, V shaped or otherwise in cross section. The separate thickness of metal f is provided with openings f which coincide 'with the openings e of the separate thickness of metal (1, so that when two sections of pipe are connected the openings f will coincide exactly with the openings 6' so that the air can pass directly from the air flue of one section to that of the next succeeding one. This separate thickness of metal f which forms the seat for the other separate thickness of metal 61 may be also soldered at different points to hold it securely in place. It is apparent, however, that lugs or other forms of supports might be employed Within the outer air-flue to form supports for the tongue or extension e of the separate thickness of metal cl. By the employment of the separatethicknessof metal at the sections of pipe may be'formed in long lengths it only being necessary to secure said separate thickness of metal in place in the manner described. The common practice at present is to bevel the ends of the inner hot-air flue and the outer air-flue, or otherwise converge their ends and unite them by overlapping the edges thereof, but this practice is not adapted for the construction of sections of ,any great length owing to the difficulty of drawing or beveling the ends and uniting them. By the employmment of a separate thickness of metal all necessity of beveling the ends of the pipe or otherwise uniting them is avoided.

What I claim as my invention, and desire to secure by Letters Patent, is

A hot air pipe consisting of an inner hot air flue formed by one body portion and an the body portions to enter into a seat in the opposite end of the adjoining pipe, said projecting tongue being perforated, the seat in the opposite end of the pipe being formed of a separate sheet metal portion extending along the outer faces of each body portion and over the edge of the same, and. thence into the outer air flue so as to form a seat for the reception of the tongue at the other end of the pipe, such seat having perforations -therein, substantially as set forth.

:In testimony whereof I, the said JOHN P. SOHAFFER, have hereunto set my hand.

' JOHN P. SCI-IAFFER. E Witnesses:

R0131. P. NEVEN, J 1 I ROBT. D. TOTTEN.