US1422828A - Pipeless furnace - Google Patents

Description

4 7 r 0 w W, 4 Z Z 6 4 l m M m 0 I w 5 AV 1 1 m 3 MM. M Z L\\\ a W o 2 4 m a C. M. BULLER. PIPELESIS FURNACE.

APPLICATION FILED NOV-12,1919.

Patented July 18,

afigago l l 7 .4 y

Milli its sates oHARLns' fBULLnRfor MILWAUKEE, wIscoNsIN, ASSIGNOR to L. J'. MUELLER FUR ACE COMPANY, or MILWAUKEE, w1sooNs1N, a CORPORATION or wrs- CONSIN.

rIrnLEss FURNACE.

Specification of Letters Patent.

Patented July 18, 11922.

Application filed November 12, 1919. Serial No. 337,553.

To aZZ whom it may concem Be it known that 1, CHARLES M. BUL ER, a citizen of the United States, and. resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have inventednew and useful Improvements in Pipeless Furnaces, of which the following is a'descri'ption, reference being had to the accompanying drawings,fwhich are a part of this specificatlon.

The present invention relates to certaln new and useful improvements in heating furnaces of the hot air conductor type in which cold and hot air ducts have coincidentte'rminals above the heater, and refers more particularly to the furnace section or dome connecting the heat chamber proper with the terminal. I

As the dome sections connectingthe heat chamber proper with the terminal are generally substantially cone-shaped it has been the custom to construct the same by means of a strip of metal cut'in an are so that when the ends thereof are brought together they will form a'tubular section having inclined walls. This method of constructing the sections is extremely unsatisfactory as there is a considerable wastage of material due to the cutting of a blank on an arc, and with this in mind my invention has for one of its objects to provide a furnace section of the class described, so constructed as to eliminate all wastage.

Another object of my invention 'is to 'provide a furnace sec-tion of the class described which'will be formed from a substantially rectangular sheet or blank of material crimpedor plaited to give the desired inclination to the'walls and at the same time substa'ntially reinforce the same.

A further object of this invention is to provide a furnace section of the class de scribed employing two complementary sections constructed as described and nested to provide a hot air passageway surrounded by a dead air space. i

A still further object of the present invention is to provide a furnace section of the type described in which the section is readily interchangeable with furnaces of the 50 same type of various sizes, and which will be of simple construction and extremely inexpensive to produce.

With 'the above and other objects in view which will appear as the description proceeds, my invention resides in the novel construction, combination and arrangement of parts, substantially hereinafter described and more particularly defined by the appended claims, it being understood thatsuch changes in the precise embodiment of the herein disclosed invent-ion may be made as come within the scope of the claims.

D In the accompanying drawings 1 have illustrated two complete examples of the physical embodiment of my invention constructed according to the best modes I have so far devised for the practical application of the principles thereof, and in which:

F 1g. l is a sectional view through the upper portion of a heating furnace employing my novel form of furnace section providing a hot air passageway.

F ig; 2 is asectional view taken through my novel form of furnace section on the line 2-2 of Fig. 1.

ig. 3 is an enlarged fragmentary view takenon the line 33 of Fig. 2.

Fig. 4 is a. plan View of rectangular blank employed in forming the furnace section.

Fig. 5 is a side plan view of a slightly modified form of my furnace section.

Fig. 6 is an enlarged fragmentary sectional view taken through a portion of the upper half thereof on the line 66 of Fig. 5, and I Fig. 7 is a top plan view thereof.

As illustrated the furnace is of well known type wherein the heater is surrounded by casings constituting two chambers, one the hot air chamber for conducting the hot air upwardly, and the other, a cold air chamber for conducting the cold atmosphere downwardly and communicating with the hot air chamber at the base thereof.

A drum including two spaced apart casings 10 surround the heater (not shown) and have their upper ends retained in spaced relation by means of an upper ring or hook ll centrally provided with a laterally eXtend ing annular rib or re-inforoing flange 12 having a plurality of U-shaped members 13 engaging the inner casing 10 as best shown in Fig. 2.

The drum formed by the casings 10 provides a heating chamber surrol'lnding the heater (not shown) and said heating chamand'is formed of two complementary sections 19 each formed from a single sheet or rectangular blank of material 20 the ends of which have been secured together to provide a plain open ended cylinder which is then placed in a stamping machine and ribbed or plaited as at 21 whereby the walls are inclined upwardly and inwardly. The ribs 21,, besides giving the desired shape to the sections 19, form re-inforcing means for the drum as will be at once apparent. The upper smaller ends of the sections are beaded as at 22 and the portions above the beads 22 are directed upwardly in a. straight line as at 23 for'receivino' the lowerend of the pipe 18, the beads 22 limiting the engagement. of said pipe with the drum sect-ion. The lower ends of the section 19 are struck laterally and then downwardly as at 24 to provide flanges for engaging the annular ring 11.

The dome 16, as before stated, consists of two of the sections 19 nested together as best shown in Figs. 1 and 2 whereby a stronger structure is had having the walls thereof separated 'by a dead air space 25. The dead air space 25 is provided by the head 22 of the innermost section 19 abutting the adjacent wall portion of the outermost section 19, preventing the walls of the same from engaging, ant the downwardly extending flanges 24 of the sections are engaged, as shown in Fig. 2. The top edge of the portion 23 of the outmost section 19 is preferably turned inwardly a slight distance for convenience in fitting the pipe section 18 thereon.

Heretofore, it hasbeen common practice to form the dome 16 from a blank of material so cut that when its ends are brought together and riveted or otherwise secured, a dome is formed provided with upwardly and inwardly inclined walls. This method is extremely wasteful in material in that, to cut the blank in the desired shape. the longitudinal edges of the blank must be curved. and consequently when out from a sheet of material of a given size, the number obtained from one sheet is greatly re-- duced and the material cut away is a complete loss, being of no use whatsoever.

Consequently one of the main advantages obtained by my method of forming the dome 16, is that the waste of material is practically nil, and a great number of blanks may be cut from a single sheet of material. As hereinbefore described I form the dome 16 from a single blank of material of rectangular form which may he of one piece or of several pieces secured together, to form a plain cylindrical caslng which is then plaited or ribbed to provide the inclined walls. This methodof constructing the dome 16 also provides a reinforced dome as will be obvious.

In Figs. 5, 6, and 7 I have employed a slightly modified form of my invention in whichthe dome section has a lower portion similar to that type of my invention described having inclined walls and has an upper section of rectangular shape for engagement with a rectangular pipe or else which may be adapted to receive directly the grating 17.

What 1 claim for my invention is:

1. A section for a heating furnace consisting of a tapered tubular casing having longitudinally extending reinforcing plaits in spaced relation, the plaits at the end of the casing of less size being of greater width than at the other or larger end of the casing, said casing having a medial circumferentially extending rib and an end flange.

2. A section for a heating furnace consisting of a tapered tubular casing having longitudinally extending reinforcing plaits in spaced relation, the plaits starting adjacent the larger end of the casing and gradually increasing in width towards the end of the casing of less size, said casing having a medial circumferentially extending rib and an angular end flange.

3. A section for a heating furnace consisting of a tapered tubular, casing having longitudinally extending reinforcing plaits in spaced relation, the plaits starting adjacent the larger end of the casing and gradually increasing in width towards the end of the casing of less diameter, said casing having a circumferentially extending rib near its end of smaller size and an outwardly and downwardly extending flange at its end of larger size.

4. A section for a heating furnace consisting of two tapered tubular casings having longitudinally extending reinforcing plaits in spaced relation, the plaits starting adjacent the larger ends of the casings and gradually increasing in width towards the ends ofthe casings of lessdiameter, said casings having circumferential ribs near their ends'of smaller size and also having outwardly and downwardly extending flanges at their ends of larger size. one of said casings extending around the other in spaced relation with theflanged portions in intimate contact, the opposite ends of the casings also being in engagement with each other and with the outer casing contacting with the annular rib of the inner casing.

5. A section for heating furnaces, comprising two complementary casings, longitudinally extending plaits formed in each casing to form reenforcing ribs and inclined Walls, a circuniferentiaily extending rib formed in each casing near one end, and a flange formed on each casing near the other end, said casings being nested and the rib of the inner casing retaining the intermediate wail portions of the casing in spaced relation and the flange of the outer casing; abutting the flange of the inner casing to provide an air space therehetween closed at both ends.

In testimony whereof, I affix my signature.

CHARLES M. BULLER.

Images