US967927A - Furnace-door. - Google Patents

Description

G. J. f'. JoHNsoN.'

FURNAGB DOOR.

mumculorr FILED 1120.2, 190g.

Patented Aug* 23,` 1910.

BHEETS-SHEET l.

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ME L CARL d. F. Jmfriscm. 7W mm Av1-vs..

1 n srnrns PATENT ormoni l Gsm.. J. r. manson, or Gramm, omo.

newer.

To all whom it may condom:

Be it known that I, Cnn, J. F. Jonuson,

s. citizen of the United States, residing at Cleveland, in thc'county of 'Cuyehoga and Stnteo Ohio, have invented certain new and usefulA Impr temente in Furnace-Doors, of which the following is a ocilication.

My invention relates to urnace doors, and the invention consists in' an improye ment upon s furnace door'of which I am the inventor and for which Letters Patent of the United States were issued October 29, loc?, and numbed 869,575. In the' scid patent the style or type of furnaces in er with which my improved door is eepecinllv intended to be usui is snc-h, for ersmple,'es billet heating furnaces and reheating 'furnaces of one form or snot-her blasts of gaseous :fuel or other excessive heet! producto" agent enrnloved; and in consequence oi which it is dilicult to coniine the gas in the furnace, especially' in cases where there are a number of openn the weils of the furnace through which etching or the like may be acconb plisned'. These extreme conditions of heat make it diicult to maintain effective closure of the furnace and nre es 'of this application an For example, the dooras built in said Letters Potent was a cast metal structure and lor the mostY part in one piece, and had a wuter chamber und an an.' chamber -with draft pessages therefrom into the furnace, while the water jacket. was provided with both inlet :ind outlet passages or pipes at the 'top of the door. But practical tests demonstrated that this was an exceedingly faulty construction, because the water made sim ly a short circuit from the inlet to the ont et at the top of the. door, while the water in the other portion of the door becon1' ing intexmelyheated, formed steam and PUBNACE-DOOB.

peoitlcstlon of Letten Patent. Patented tlgQ23, 1910. f Appliettox lzd Becemhr 2, 1969. Serial lo. SBLWE. i

thus created a. back pressure against the water supply whichreally prevented the flow of water et ell es l had lanned. This of course would expose the tense heet of the urnace yvithout protection v or relief, 'and with thc-uneven ex ansion and contraction that inevitably o lowed the door was quicklywerped or cracked and renderedprscticolly worthless. Hence my 65 present improvement, which entirely over comes these objections and provides adoor wherein the water und air perform theirV functions in the moet satisfactory nimmer and a thoroughly eiiective construction() 70 .n accompanying s ngen', 1f-*ure 1 is a front elevation of the door and2 attnched parte, and 2 is an'edge eleyationthereoi partially sectioned et thehot- 16 3 is 'e pleegt* top view looking down upon Fi 1. Fig. 4 is a view of the doorv looking om the inside with the ner plate removed and the connecting bolts and air-'tubes in cross section. Fig. 5 is a B0.

Sectional elevation ci the complete door taken on a line correspondingto ,ii-4S, Fig.

4. Fig. 6 is an enlarged sectional view of l one of the transverse air tubes; imd showing the xnenner'of connect-ing et its ends 85 with other parte.

Hnvin reference (x) my new and improved first, that instead of being a unitary structure it is constituted of several distinct and 9 0 different' parts comprising a middle or interior part or portion B of castmetal and referred to hereinafter as the body. As such the said body is of the full sizeof the door' as viewed in outline with e main por- 95 tions? having sundry perforations or holes through the same for the tubes 3 and-the bolts 4 as well as having a sto'kingor peep hole 5 and a rim 6 entirely .about its edge and extending inward for the ariost'part. 10c from the flat mein portion 2.: This body o1;v frame is the only cast metal 4gortion ofthe door and serves as a su pmt fothr parts including es .cially tli steel pluto Erw which conform to thc out-line of body frame. B and nre secured thereto4 :is shown.` That is the face plete F is fixed to said body by means of screws through its side-` edges,

While rear or inner plate ll, whichl hns t0 119 sustan'the, exposure to the heut of the fur-Y nace, is secured to said body not only by oor to the in- 6G oor in detail, it will be observed,

e inner prcferab1y- -and the outer face plate F, ,19?

' screws through its side edges in the edge of rim G but especially by means of bolts 4 adjusted and locked upon body B through the variously scattered holes over its middle, especially. These ,bolts are threaded at both ends and one end isscrewedinto plate E and the other end passes through corre- Spendingr holes in the partition or main flat ortion 2 of body B and is locke-d thereon y a jamb nut, 8 on one side and a fasten in nut. 9 on the other side. In practice the said bolts are tirst inserted in plate E and the nuts 8 are then adjusted thereon so as to be uniformly and evenly spaced from said plate, and saidbolts are then inserted in the holes in body B and fastened` by nuts 9. The same practice is observed with tubes 3 as to both platcsB and E, and lead gaskets l0 are interposed` between the nuts both tubes 3 and S'and 9-in connection with bolts 4 to prevent possible leakage at said points, and the peep or striking hole has a wall the full depth of the rim or outer portion 6 of the body B and has inner plate F. z

' :litter materially from that shown and del scribed in my patent, and the invention I also secured thereto byw screws, l

The rim 6 of the body B extends about yhalf as far outward from the ni'ain or fiat partition 2 of the bodyy as itdoes to the rear thereof, and this construction provides an air chamber in the front. portieri oi thedoor and a water chamber or jacket in the rear portion thereof 'behind partition with the air conducting tubes passing from the air chamber through the Water chamber and bodily exposed therein exceptI at their ends. The said tubes are arranged about or near the outer ed es of the. door in such manner that. theywill discharge the air within the furnace next about the jamb of the door all around and by drivingback the gases therefrom, prevent possible burning out of the said jamb or Wall of the furnace. As to this arrangement of said tubes it is to be especially observed that injection ,of air therethrough carries initial combustion inward far enough' to effect the ends desired A through .the medium of the intlowing air. Otherwise, or over `the middle'portion of the door there is no such danger and hence solid bolts are four i best for this portion of the door structure. Again, in stoking cerf tain large furnaces the labor of several men frequently is required to handle a single stoking bar or poker. Hence I conceived the idea of a roller K to rest he bar upon at the front and bottom of stolting hole 5 and whereby half the labor formerly required can do the same work with much moreease and facility.

Water and air supply may be wholly. at

, the top of the furnace door by pipe connections N and M, or air pipe M at the top may be closed and the supplyl of air be by pipe P injected under suitable pressure into mouth 16 in the side of the door, and the exhaustof water is by pipe O while the air goes to thel furnace by ducts or tubes 3.

As to the Water supply pipe N, said pipe is shown as extending down into the water chamber or space in the door near the bottom thereof, while the exhaust O is from the top of the door. Thus the Water is caused to traverse the entire depth of the door o find the outlet andV all portions thereof are uniformly cooled and there are 'no steam pockets or the like possible anywhere to malte the cooling uneven or to defeat the freest possible circulation of the water. The door as a whole is' designed to be bodily raised when opened and any suitable con neetions with the several pipes M, N, 0 and l may be made to permit'such movement, whether the connection be by hose or sliding or jointed pipes of any available or preferred const ruction. The hole or opening 5 inthe door has the usual lid or cover 17 adapted to swing over the same from the l side and above or over roller R. i In operation the door herein does no not show the slightest tendency to buckle or become distorted or crack in any part.. The air is delivered to the door by pipe M or l is under more or less pressure as coni ditions may require, and a blower or other device to supply suchpressure may be employed, the object being to produce or promote such flow of air through the tubes El Aas will ellectually prevent accumulation of combustible gases about the edge of the door and the jamb and the consequent destruction of the brick Work as above des scribed. down or separable as occasion may demand,

i so that if for any reason anypart or portion thereof shall require repair or replacement the same can be done Without loss or destruction of the remaining parts. This is important, because if the door were a The structure as a whole is knockunitary or single piece structure as in my patent the impairment of a portion would necessitate the discarding of the entire door, which was and is a very serious objection. IVhat I claim is:

` 1. A urnaf edoor havingawater chamber in its inner'side and an air chamber in its outer side and constructed with a. body prof riding avpartition between said chambers, and' separate inner and outer plates secured upon their edges to said body, and separate an' conducting tubes fixed at their ends in said body and 'said inner plate respectively.

i 9eme?l 2.A hollow furnace doorrconsisting of a body having,- n rim about the same and, inner and outer plates fixed at their edges' vto said rim, said body dividing the door intoA front and rear chambers, bolts connecting' said inner platev with said body at intervals over its middle portion and air conducting tubes connecting said plate about its edge with said body, said bolts and tubes being alike screwed into said inner plate and secured b v nuts to said body. l

. 3. A furnace door having front and rear A cha'mbers with a division s vall between j them, 15

a plurality of transverse tubes threaded into 'the outer wall of one of said -cbalnbers andextending through said divisin wall into the other chamber,` and a jam nut and a fastening nut on each tube engag- Y ing the same on opposite sides of said division wall.

4. A double chambered furnace V'door having a series of tubes openvto one of said f chanibers and passing .through the other chamber, separate outer plates for said chambers respectively and' a central part to which said plates are secured having said tubes removably fixed therein.

5. A furnace door with inner and outer Chambers having; each a separate outer plate and a central member with a rim extendin about the outsidev of said chambers an dividing the same and said plates -remov-.

`in presence of two witnesses.

CARL J. F. JOHNSON.

witnesses y E..M. FleHER,

F.` C. MUSSUN.

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