US1764708A - Integral roof construction for furnaces - Google Patents

Description

Jane 17, 1930. L, s, ABBOTT 1,764,708.

INTEGRAL ROOF CONSTRUCTIOI FOR FURNACES Fild April 4. 1927 2 Sheets-Sheet 1 June 17, 1930. L. s. ABBOTT 1,764308 INTEGRAL ROOF CONSTRUCTION FOR FURIACES' Filed April 4, 1927 '2 Sheets-Sheet, 2.

\ mmmm 2W lyle 54 005072, flAOZZ It is a'further Patented June 17, 1930' jumreo STATES LYLE s'rocxron ABBOTT, or onrcneo, ILLINoIs INTEGRAL ROOF CONSTRUCTION FOR FURNACES Application filed April 4, 1927. Serial No. 180,910.

Myinvention relates to an integral roof structure for furnaces and has for its Object the provision of a roof of the character that is capable of being readily adapted to an existing furnace setting or a new setting and which may be quickly replaced and repaired.

In a number of plants where a continuous process or treatment is being carried on and where furnaces are used in certain steps of the process if the furnaces have to be shut down for repairs, the loss due to the interruption of the continuous process, is often a very serious one. The roof of the furnace, subjected to the extreme heat within the furnace chamber, is one of the first parts to need repairing. It is the purpose of this invention to provide a roof which will eliminate the delay and loss incurred in repairing the roof.

Another object of this inventionis to provide a furnace roofof this character which may be adjusted to change the furnace .volumeto meet the requirements of different sizes of charges placed therein for treatment and thus obtain the best results from the furnace. i i object of this invention to provide a roof for furnaces that may be put in place or removed in its entirety without disarranging the component parts thereof,

. and in which the component parts thereof may be readily adjusted or replaced in case of da-mage to any part. For instance, if certain of the refractory tile suspended from the framework become so bad after a period of service that they must be replaced, the new tire replacing them may readily be adjusted to align with the old tile left in the structure. V

Other objects and advantages of theinvention will appear. as the description procoeds in connection with theaceompanying drawingswherein the preferred form of the invention is illustrated. However, it is obvious tliativarlous modifications may be made in the details of construction without departing from the spirit of the invention and I intend to avail myself of all such modifications as fall within the scope of the claims. In the drawings mounted upon furnace walls;

Fig. 2 is a transverse section on line 2-- of Fig. 1; I t t Fig. 3 is a section on line 33of;Fig. 2, Fig. 4 is a detailed view showing the particular device used for suspending the refractory tile from the frame work; and

' Fig. 5 is a fragmetary detail illustrating a modified means for maintaining the tile units in proper position.

Referring now in detail to the drawings,

the numeral indicates a furnace having the side walls 11, 12, 13 and 14 which are adapted to have supported thereon my improved roof structure. This structure as shown is composed of a pair of channel beams 15 and 16 which are spaced substantially the width of the furnace and have their ends supported on the side walls by means of the jacks 17, 18, 19 and 20 or other suitable means whereby the channel bar may be moved vertically with respect to the furnace walls so as toadjust the height of the roof. As shown, each of these channel bars is also provided with a pair of upstanding projections 21 which are provided with openings 22 to receive hooksor other suitable means for lifting the channel bars and the structure supported thereby so that the entire device may be removed as a unit from the furnace. Extending between the two channel bars 15 and 16are a plurality. of T-bars 2 1- which are substantially parallel and serve as a means for supporting the refractory tile in the manner which will be presentlyexplained. These T-bars as shown clearly in Fig. 1, are rigidly connected to the channel bars by means of theangle irons having the portions 25 secured against the Flg. 1 1s a plan view showmg my dev1ce which is rounded so as to present a smooth surface for the saddle to rest upon. The central portion 29 of the saddle is also rounded transversely as shown in Fig. 5 at '31, so that the saddle may rock about an certain amount of angular adjustment in the same. The saddles 28 are provided with a pair of openings at the opposite ends thereof and the U-bolts 32 have their legs 33 and 34 extending upwardly through these openings and screw-threaded toreceive the nuts 35 and'36, whereby they may be adjusted vertically with respect to the saddles. This firmly secures the, U-bolts upon the T-bars and there is no danger of their being displaced upon movement of the roof because each U-bolt together withfits corresponding saddle completely surrounds'the T-bar so that it cannot be removed therefrom with out removal of the butts 35 antv The saddles and the corresponding U-bolts may he slid longitudinally along the 'T-bars to any desired position, as in instances where the size of the furnace is known, together with the size of refractory blocks used, if it is so desired the T-bars may be notched as shown in Fig. 5 at 37, to provide a seat in which the saddles may rest and this will serve to properly space the saddles and U-bolts along their respective T-bars.

Each of the U-bolts "carries ahanger bar 40 which in turn has supported thereon a plurality of refractory blocks 41 which form the refractory lower surface for the furnace roof. ,As shown, the hang-er bars have a central lug portion 42' provided with an opening 43 through which the'U-bolt ex- I tends, and this opening as shown in Fig. 4 is rounded at the upper surface thereof to permit adjustment of the hanger bar with respect to theU bolt. The hanger bar is also provided at the oppositeends thereof with projecting portions 44 and 45 which serve to hold the refractory elements 41 in position thereon, but permit them to be removed by liftingthem vertically with respect to the hanger bar and then removing them endwise from said bar. The refractory elements 41 each are provided with around hole 46 to receive the hanger bar, and each of the blocks isalso recessed adjacent the upperend thereof as at 47, to provide a thinner upper portion through which the stantially plane. Thus when a set of four blocks are assembled upon a hanger bar, the two inner blocks have the recessed faces turned toward each other to provide a space therebetween for the lug 42 and the corresponding U-bolt 32 engaging said lug. The two outer blocks are then placed with their plane faces in engagement with the two plane faces of the inner blocks so that the recesses on these blocks wil. face outwardly, and by this means of assembly the lower thicker portions of the blocks will extend to beyond the ends of the hanger bar and abut with the next adjacent unit so as to form a substantially closed joint.

The provision of the round holes in the block 4l together with the provision of the curved or rounded upper surfaces 48 on the hanger barscause a good bearing surface for each block and in addition permits the block to adjust itself relatively to the hanger bar so that it is not placed under any strain except that of its own weight in depending from the hanger bar.

From the above description it is thought that the construction of my improved roof will be clear to one skilled in this art. The provision of the channel bars and their connection with the T-bars provides a rigid frame work which may be handled with comparative safety, and the manner of suspending the refractory blocks from the T-bars assures extreme flexibility of the roof in adjusting itself to various conditions.

The particular suspension means also permits removal of the roof from the furnace replacement thereof without any removal of parts or serious danger of breakage of the elements, since each row of refractory tile is capable of movement with respect to the frame within limits, but cannot be'removed therefrom dueto swinging the frame around when it is moved off with a crane or other suitable means and a new furnace roof is placed upon the furnace. I

Also the provision of the means for adjusting the channel bars up and down provides a simple means of changing the volume of the furnace chamber so that the best results canbe obtained for any particular charge to be heated in the furnace. Thus when an extremely small charge is to be heated, or a series of such charges, the furnace roof can be dropped down to cut down the volume of the furnace and in this manner a greater efiiciency as well as a greater speed in heating up the charges can be obtained.

The adjustment provided by use of the U-bolts also permits the replacement of any unit of tile supported by hanger bars with a new unit which can be adjusted so that lower end will be, substantially flush with the lower end "of the old tileremaining in the roof, and in this manner the sudden burning off of thenew tile placed in the roof "standing sidewalls around the furnace chamdue to the fact that it is exposed below the tile which are partly burned off, is prevented. V 7

Having thus described my invention, what I claim and desire to secure by U. S. Letters from and hanger bars pivoted to said U bolts carrying said refractory material.

2. A roof for furnaces comprising a rigid framework having a pair of end bars and spaced cross bars connecting said end bars, hanger bars supported by said cross bars and supporting a plurality of refractory tile members to form a refractory lower face for said roof, said end bars having members adjustably mounted on-the opposite ends thereof for engagement with the furnace walls whereby the roof may be raised or lowered with respect to the furnace, said roof being bodily removable from saidfurace as a unit.

3. In a furnace construction having upber, a roof of refractory material for said furnace and supporting means for said refractory material comprising a framework including a plurality of substantially parallel cross bars and saddle members resting upon said cross bars, U-bolts having the legs thereof extending on opposite sides of the cross bars and secured to said saddle members and hanger bars pivoted to said U"- bolts carrymg sald refractory material.

4. A roof for furnaces comprising a rigid framework having a pair. of end bars and spaced cross bars connectingsaid end bars, hanger bars supported by said cross bars and supporting 'a plurality of refractory tile members to form a refractory lower face for said roof, said end bars carrying a plurality of supporting members having screw threaded engagement with said end bars and adapted to rest on the furnace walls whereby said roof may be adjusted vertically on said furnace and bodily removed therefrom.

5. A roof for furnaces comprising a framework having means thereon for suspending refractory tile elements therefrom to form a roof of refractory material for a furnace and having portions projecting be yond the boundary of the refractory material serving to support the framework on the vertical walls of a furnace, and means carried by said portions resting on said vertical walls for adjusting said roof vertically to vary the furnace volume, said last named means and framework being bodily removable from said furnace as a unit.

In Witness whereof, I hereunto subscribe my name this 29th day of March, A. D. 1927.,

LYLE STOCKTON ABBOTT.

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