US1448060A - Spring bung - Google Patents

Description

H. H. GR'AHAM SPRING BUNG Filed Nov. 8, 1920 Mar. 13,'4 1923,

Patented Mar. 13, 1923.

UNITED STATES Partnr ortica.

HENRY H. GRAHAM, OIEl DANV'ILLE, ILLINOIS, ASSIGNOR TO ALLITPI-PROUTY COM- PANY, 0F DANVILLE, ILLINOIS, A CORPORATION 0F ILLINOIS.

SPRING Brine Application filed November 8, 1920. Serial No. 422,446.

To @ZZ whom t may concern:

Be it known that I, HENRY H. GRAHAM, a citizen of the United States, residing at Danville, in the county of Vermilion and State of Illinois, have invented certain new and useful Improvements in a. Spring Bung, of which the following is a specification.

My invention relates to the construction of melting and heating furnaces and is especially adaptable to roof construction for these types of furnaces.

My invention is exemplified in the present instance as applied to bungs for forming roofs of malleable iron melting furnaces and the like.

An object of my invention is to improved means of supporting refractory bricks or material in furnace bungs for successful commercial' use.

Ano-ther object is to provide a furnace roof co-nstructed of metal and refractory materials in such manner that the refractory materials may be retained under yielding pressure with respect to the metal to compensate for the differences in the rates of expansion and contraction of the materials and at the same time adapted to permit rapid application and removal of the refractory material with respect to the metal.

A further object is the provision of means for yieldingly supporting refractory bricks and the like in furnace bungs whereby'ready application and removal of the bricks may beaccomplished without desplacement, loss or remo-val of any of the brick supporting elements. n

The present practice of supporting refractory bricks in furnace bungs is objectionable in that the expansion and contraction of the bricks must be watched carefully by a furnace attendant and any contraction compensated for by the attendant tightening the screws o-n the ends of the bungs. This manner of tightening the screws is objectionable, first, because the actual work is undesirable on account of the heat, and second, because it is ver, difiicult'to determine definitely how muc or how little the adjusting screw should be tightenedto obtain the desired result.

Generally speaking, I carry out my invention by mounting at leach end of a bung bung of well-known type provided with va-v rious novel features embodying my invention; and

Figure 2 is an elevation of the bungv ofy Figure 1.

The bung shown in the drawings 'is made of an inverted T-shaped casting having the usual fiat lower portion 5 which is curved in elevation to correspond to the desired Vcurvature ofthey roof of the furnace and wide enough'to serve asma support for the refractory bricks 6. A flange or web 7 extends upwardly centrally of the portion 5. Heads 8 are pivoted by meansyof lateral extensions 8 at points intermediatetheir ends at 9 to the web 7 of the bung. The heads 8 comprise lower portions 8a which extend laterally and engage the endmost brick in the bung, while the upperportions 8" of the heads are operatively associated Vwith coil springs 10,. l The springs 1.0 are mounted on separated end members seats or bosses 11 and 12, which are relatively movable, the member 11 being pivoted lat 13 to a projection 14 of the web 7 of the bung. Each of the members 11 and 12 has a central lug 15 directed towards each other and adapted to extend into the interior of the spring for the purpose of centering the same, and for preventing displacement thereof when not under compression. The member 12 is pivoted on the bolt or other pivot pin 9 and is engaged on its outer face bythe end of an adjusting screw 16 which has a head 17 for engagement by a wrench or othertool, thev screw 16 being threaded into the upper end 8" of the head 8. For mounting the bolt 16 in the head 8 a nut is provided in. a suitable recess in the end 8b of the head. The bolt is then passed through this nut so that when turned by a Asuitable tool applied tothe head 17 of the bolt thehead 8 may be rocked about its pivot 9 for the purpose of varying the spring' pressure on the bricks G in the bung'. For l providing means to lift and move the bung the webis provided with a series of openings 18 to which a clevice vor',l other member 19 may be attached by bolts' 20 so that a crane or othery lifting mechanism may be attached for moving the bung.

The operation of the device is as follows: The refractorybricks G having been in'- serted in croslswise position, as shown in the dra/wings and in a manner well known, the heads l8 are caused to engage the endmost bricks in the bung, the lower ends Sabearing against theese bricks. A plate o'r other protector 21 may be interposed if desired be* tween the heads and the bricks to prevent the latterbeingdamaged by reason of the Contact therewith of the heads 8. After the bricks arein position the adjusting screws 16 are turned so that the tension of the springs 10` will'be such as to permit movement of. the heads 8 as the bricks contract and expand and at the same time not so great as to break any of the bricks nor lto permit' buckling under' excessive expansion. I have found that a bung constructed in accordance with my invention will last m'u'ch longer than a bung constructed in accordance with the .present practice, that is, where the heads are kept in contact with the bricks by. means of adjusting screws turned from time to time by a furnace attendant. My` experience has been that with the present 'bungs many bricks are lost be fore' they have served their usefulness in roof construction by reason of the fact that the furnace attendant was laX in adjusting the screws to correspond to thecontraction or epansion of the refractory bricks.

It will be observe'dthat my invention is automatic in operation, the adjusting screw 16'once' havingbeen manipulated to properly tension the "spring 10. In removing `the old'bricls and ap'plyingxne'w bricks to the bung anyI means may be employed to 4move the heads 8 about their pivots 9 so'that the bricks' may bee'asily applied to the bungs.`

I have shown a bung as constructed of c'a'st` metal. However, I do not wish to be limited'thereto,'as a furnace bungmay be made'of commercial shapes of metals such as'Ilbealms' or T-bars or other shapes bent te correspond with the curvature ofthe fur! nace roof.'h In the event bungs are made of commercial shapes the heads of my invention may be secured theretoin a manner similar to' that shown'A in the drawings.

Vthile' I' have described more or less preciselyv4 the details ofv construction of my invention, I do not wish to be understood as i/iaaoeo limiting myself thereto, as I contemplate changes in form and proportion of parts and thecsubstitution of equivalents as circumstancesma'y suggest or render expedlent, without departing from the spirit of my invention.

1. A bung con'structintfor furnace roofs including in combination, heads pivoted at each end of the bung, said heads being spaced froml the bung ends by lateral eX- tensions which are pivotally connected to the bung, an inner spring seat pivotedto the bung, and an outer spring seat having a double vpivotal connectio'n'with the bung at the head pivotal connection, a springsupported between said seats, and a bolt thread ed into' the head for4 co-operation with the outer spring seat` for varying .the effectiveness of said spring and transmitting lthe salme to the head" .for coloperating with bricksfsupportedv therein.

Q. A spring lever construction for retaining bricks in bungs and the likeincluding in combination; heads pivoted intermediate their ends to said bung, theY lower ends of the heads adapted to receivegand retain refractory material between them, a pair of spaced bosses supported on the bung at each end thereof, a spring retained by, and between the bosses of each pair', and a bolt threaded into the upper end of. a head adapted to bear `against one of the bosses whereby the resiliency of said spring may be imparted to .saidbricksthrough said head and'varied according to the position of said bolt 4within said head.

3. In a device of the class described including `in combination, a; bung formed of metal having a flange.. and a' web,'heads pivotedrto the web at the ends ofthe bung by projections whereby said heads may be maintained in spaced relation to the ends of the bung, spring bosses pivoted to the web near the ends of the same, each boss having a centrally disposed lugthereon, lthe lugs of the' bossesat each end ofy the bungY being arranged in pairs with thevlugs of each pair extending towards each' other' for receiving and retaining a coiled spring thereon, and a bolt passingthrougha head for coi-operationwith one of said bosses for varying the veffectiveness `vof the springwith respect to refractory materials retained in the bung. v

4. In a furnace roof construction, the combination of a metallic bung,'heads connected' at intermediate p'int their lengthvin a' pivotal'manner' to the bungand having the lojwerlp'ortions thereof' arranged to receiveand hold refractory material between them, a bolt;pass'ingthrough the u'pper end o`f a head; anda' sprin'g'co'foperating with said bolt for pressing the lower ends of the heads against the bricks, said spring being supported at each end by sep-` arated pivoted Seats7 the seat farther from the head being pivoted to a portion of the bung Web and the seat nearer the head being pivoted to the vbung atthe pivotal connection of the head, each of said seats having lugs on the active Surfaces thereof for projecting into the ends of the spring `for preventing displacement of the same with respect to said seats. 10 Signed at Danville, Illinois, this 30th day of October, 1920.

HENRY H.-GRAHAM.

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