US1668164A - Apparatus for heating and transfer of articles - Google Patents

Description

May 1, 1928.

H. P. MGCANN APPARATUS FOR HEATING AND TRANSFER OF ARTICLES Filed March 17, 1926 lll|u|| llllllllllllllll 4 Sheets-Sheet 1 May 1, 1928,.

v H. P. M CANN APPARATUS FOR HEATING AND TRANSFER 0? ARTICLES Filed March 17,- 19 25 4 Sheets-Sheet 2 [ark/liar mum m m .m 1 V "M m m A 1. m m/mw 31K u m EN mw u Q Q Q L w@ a Q R o 7 a V W\ h l Q\ EN N A Q u I 4 u m n 0 w U D U U D w h R w 3 S Q A m mu 0 m6 1Q May 1, 1928. 1,668,164

\ H. P. M CANN APPARATUS Fofl ilfefll'wgr OF ARTICLES I 4 Sheets Sheet 3 INVENTOR May 1,1928. 4 A 1,668,164 H. P. M cANN APPARATUS FOR HEATING AND TRANSFER OF ARTICLES.

.Filed March 17, 1926 4 Sheets-Sheet 4 Y 4 r 4 0/ \C) O O *6) r1 j I Q A I a 24 I L I I INVEN1$DR J WWW HARRY r. mcCA PATENT OFFICE.

cw; or REISSUED APPARATUS FOR HEA'FIJING Ann inimises-151 ARTICLES.

Application aka This invention relates to furnaces usedfo'r metallurgical purposes, and more partit larly to furnaces of the type that are on? ployed for theheat-treatment of articles and wherein the articles are conveyed through one or more heat-treating chambers at a rate of travel which will permit them to receive the desired or necessary treatment before being finally removed or discharged therefrom.

Among the general objects of the invention, are the provision of a furnace with a quenching tank and with means for delivering the articles, in a suitable manner and preferably oneat a time, into such tank; also to provide a furnace of the character described with efiicient means for transferring the articles automatically from the quenching tank to another heat-treatment chamber. Further and more limited objects of .the invention will be set forth in the specification and will be accomplished in and through the construction and arra-ngement'of parts shown in the drawings, wherein Fig. 1 represents a side elevation of a furnace embodying my invention, the rear of the furnace being broken away and the walking beams being in-their lowered or non-feeding position; Fig. 2 a vertical longitudinal section through said furnace, the parts being in the positions which they assume when the beams are in elevated feeding position; Fig. 3v a transverse sectional view through the rear portion of the furnace shown in Fig. 2; Fig. 4 a detail in plan of the rear part of the furnace, showing the mechanism for receiving the articles from the lowerheat-treatment chamber, and for delivering them to the quenching tank and to the elevating conveyor; Fig. 5 a detail in section of the mechanism shown in Fig. 4, the parts being in the positions which they assume prior to delivering an article to the quenching tank; and Fig. 6 a view similar to Fig. 5. showing the positions assumed by the-parts when an article is being delivered to the quenching tank.

In the preferredemlmdiment of my invention. I have illustrated somewhat diagran'imatically a heat-treatment furnace of the tvpe shown in my application No. 10,770

filed February 2l,1925, and I have shown the said furnace as provided with a hearth having a walking-beam arrangement for feeding articles along the hearth and tl'irough the heat-treatment chamber above such hearth in substantially the same manner as shown in my Patent No. 1,400,367 issued De- 17, 1926;" seria in; 95,258.

v cember 13, i921. The furnace so illustrated and so equipped is provided with a quenchmg. tank, a chute for conducting into the tank articles delivered successively thereto by the intermittent movements of the walking beams; there being special means for supporting the articles in the chute against tilting and for insuring the delivery of the same inproper relation to conveying means by which the said articles are transferred from the quenchingtank to another heattreatment ehamberpreferably in the same iurnace and'above the first-mentionedchamer. 1 Describing the parts by reference charactcrr, A represents a lower heat-treatment chamber, B a combustion chamber thereabove,() a distributing chamber above the chamber B, and D an upper heat-treatment chamber.

The chamber A is provided with a hearth 1 provided with longitudinal slots 2 there through (Fig. 4) in which there are disposed walking-beams 3 for moving the work-arti- .cles (shown as round bars 4) step by step through the said chamber. In order to move the articles through the chamber 1 in the manner described, I have provided mechanism similar to that shown in my patent aforesaid whereby the beams 3 will be elevated above the hearth sections 1, thereby lifting the articles from such sections; will be moved rearwardly the desired distance while in such elevated position, carrying the articles rearwardly with them, will then be lowered, thereby to deposit the articles upon the hearth sections in advanced position; and will finally be moved,-below the hearth level, to initial position. The mechanism for effecting this result comprises levers adapted to raise and lower the said beams, with other mechanism operating upon the beams, when elevated, to move them rearwardly the desired'distance and to operate upon the beams, when lowered, to move them a like distance in the reverse direction. The lifting mechanism will now be described :-5 denotes a rod extending longitudinally of the furnace below the central portion thereof, the'sa-id rod being pivotally connected at its front end with the lower end of a lever 7 which is pivoted at 8 and which has at its upper end a roller 9 engaging a cam 10 on a shaft 11. Arms 12 are pivotally connected at their lower endsto the rod 5, as shown at 13, being rigidly connected at their upper ends to rock shafts 14 extending transverselyof the bottom of the furnace and each having rigid therewith a pair of laterally-spaced levers 15, the levers being located below the beams '3 and each having at its u per end a roller the block and being provided with bloc engaging abutments 23, 24 on opposite sides of the block. Several abutments 24 may be employed, the same being removably mounted upon the rod 22, whereby the distance be tween the front abutment 22 and the particular operatin rear abutment 24 may be varied, there y to efiect like variations in the extent 'of the lost-motion connection between the link and the block 20 with corre-'- spondin variations in the periods of rest between t e reciprocations of the walking beams. E denotes a quenching tank at the rear of the furnace, there being a chute arranged to receive the articles as they are delivered from the rear end of the hearth by the walking beams. As will be seenin Fig. 2, the rear end of the hearthicomprises a transversely extending block 19'. having slots 2 for angular rear extensions'3 'of the walk ing beams. The rear end ofthe block 1 is beveled downwardly and rearwardl and from the bottom of-such beveled portion extend the laterally-spaced chute members 25,

the outer chute members being provided each with a side flange 25', the flanges serving as side walls for the chute. Each chute member is provided with a transversely extending bottom flange 25" the said flanges constituting a chute bottom adapted to receive an article delivered to the chute and to hold itin operative relation to the transverselyalined lifters 26 mounted on cross bars 26" extending between and carried by a pair of conveyor chains 26, the said chains being mounted on lower sprockets 27 carried by a transverse shaft 28. The mounting. of the "upper ends of the chains will be described hereinafter.

In connection with the mechanism for feeding the articles through the chamber A, I provide take-off mechanism for receiving the articles as they are delivered over the rear end 1 of the hearth and for maintaining said articles transversely of the chute while loweringthem to a position adjacent t-ht-- lifters 26 before them. This delivers the articles upon the transverselymoving the walking rovided with an arm 30 which is connected y a link 31 with a lever 32 which is pivoted at its lower end to a suitable support 33 and is connected intermediate of its ends by a link 34 with the rod 5 which raises and lowers the walking beams. 4

Rigid with the rock shaft 29 is a series of I arms 36, three such arms bein shown and the arms being adapted to wor within the slots provided between the chute members 25. When the walking beams are in their lowered positions, the arms 36 will be thrown downwardl to the position shown in Fig. 1, with their ends 36' below and in front .of the chute. When the walking beams are in their elevated position, as shown in Fi 2, the rod 5 will have operated the roc shaft 29 to project the ends 36 of the arms throu h the slots 25 and to move such ends to t e upper ends of the slots, in position to receive the articles delivered from the hearth. The manner in which the work is so delivered will be apparent from Figs. 5 and 6. The former figure shows the articles 4 supported b the hearth sections 1, the rearmost article in adjacent to the rear end of the hearth an the walking beams bein in their lowered and rearward sition. n Fig. 6, the walking beam is s own in full linesin its elevated forward position, in which position it lifts all of the pieces of work or articles 4 except the rearmost article, which is supported upon the hearth sections 1. When thewalking beams are moved rearwardly to theposition shown in dotted lines, the rearmost piece of work is moved thereby beyond the rear edge of the hearth and drops down the chute, as shown in dotted lines at 4", in position to be received by the arms 36 except for the action of the blocking mechanism which is employed to prevent a premature. or accidental delivery of an article in the chute and into the quenching tank- This blocking mechanism com )rise's an L-shaped frame, indicated genera ly at.

37 and having at its front end the obstructing flanges 37 the front of the frame being adapted to rest upon the rear of the hearth section 1' (see Fig. 5). This frame 37 is provided with trunnions 38 mounted in journals 39 in the sids of the furnace, being overweighted forwardly so that it tends to rest with its front edge upon the rear of the hearth. In the bottom of the frame 37 are mounted rollers 40, these rollers registering with th slots between the chute mem.

bers The parts are so arranged that,

when the beams 3 are elevated, the motion of the rod 5 will rock the shaft 29 to throw the arms 36 upwardly, the upper ends 36 of these arms, engaging the rollers 40, tilt the fran1c 37 to the position shown in Fig. 6, thereby providing a space below the front of said frame for the passage of a piece of work 4 over the rear end of the hearth. ()n the rearward movement of the walking beams, this piece of work is moved over the rear end of the hearth by the walking-beam extensions 3 and drops down into the pocket formed between the bottom of the frame 37 and the beveled rear wall of the hearth. Through the lowering movement of the walking beams, the arms 36 are lowered, therebydisengaging the rollers 40, receiving the article 4 and lowering the same nearly to the bottom of the chute, when the arms pass through the slots between the chute members and deliver the article upon the transversely-alined lifters 26.

The upper ends of the conveyor chains 26 pass around idle sprockets 41 so located as to cause the lifters 26 to deliver the articles carried thereby upon the side chains 42 of a conveyor, the same traveling on tracks 43 within the chamber D. The chains 42 are supported at their rear ends on idle pinions 44 which may be conveniently mounted loosely upon the shaft 45 which carries the idle sprockets 41. The chains 26 pass over sprockets 46 mounted on a shaft 47 and thence around idle sprockets 48 and back to the sprockets 27. The lever 7 is loosely mounted on the shaft 8, which is the drive shaft for the conveyors. On one end of the shaft is a sprocket 49. A chain 50 passes around this sprocket and around a sprocket on the shaft 51, thereby driving said shaft and a sprocket 52 thereon. A chain 53 passing around the last mentioned sprocket drives a'sprocket 54 at the rear of the furnace. On the shaft 55 of the last mentioned sprocket is a gear (not shown) which meshes with a gear, (not shown) on the shaft 47, thereby to drive the said sprocket and the conveyor chains 26 ,in the appropriate direction. A sprocket (not shown) on the shaft 51 and a chain 56 extending around such sprocket and around a sprocket 57' drive a shaft 58. This shaft supports the front sprockets 59 about which the conveyor chains 42 extend.

In the furnace shown herein, the combustion chamber-B will be provided with suitable burners (not shown), the arch B beneath the said chamber being provided with perforations B which will permit access of heat and products of combustion to the chamber A. From the bottom of the chamber A, a flue 60 delivers the products of combustion to the intermediate chamber C. This chamber is heated by the products of combustion as well as by thearch B above the chamber B. The products of combustion in the chamber C heat the wall 61 between the chambers C and D, while the products from the chamber C are delivered into the chamber D through lines 62, whence they are discharged through flues 63. One of the burner inlets is indicated at 64.

With the parts constructed and arranged as described the operation will be briefly as follows:-'l'he articles 4 are conducted through the chamber A, step by step, by

the movements of the walking beams 3 described hereinbefore, these movements being effected by the cam 10, lever 7, rod 5, arms 12, arms 15, and by the crank 21, rod 22, and the abutments 22, 24, arms 19, and block 23. During each reciprocation of the rod 5, the arms 30 are moved upwardly to rock the frame 37 rearwardly thereby to receive the article delivered from the rear end of the health by the rearward movement of the elevated walking beams. The movement of the rod 5 in the reverse direction lowers the arms 36', carrying the article 4 with them to near the bottom of the chute 25, where it is delivered to" transversely'alined lifters 26 on the conveyor chains 26 and delivered onto the conveyor other chamber, the said conveyorhaving series of laterally spaced artlcle-supporting members, and movable means cooperating with the chute for receiving articles delivered successively thereto from the first chamber and for delivering them in proper operative relation to the said members.

2. In an apparatus of the character described, the combination of a first and a second heat-treatmentchamber and means for heating the same, of a quenching tank inter posed between said chambers and located below the first chamber, means for moving articles progressively through the first chamber and delivering the same to said tank, a

conveyor in the second chamber, a conveyor having laterally spaced series of article-supporting members and arranged to deliver articles from said tank to'the other conveyor, and movable means cooperating successively with the articles chamber for delivering them in proper reladelivered from the first through the delivery of articles to the upper end of said chute for moving the said arms upwardly in position to receive an article delivered to such portion of the chute and. .for moving the said arms downwardly to convey an article received thereby to the lower poi tion of saidchute, and a conveyor arranged below said arms and having a series of laterally-spaced lifting members arran ed to receive the articles conveyed by sai arms, the said conveyor exten ing in operative relation to the other heat-treatment chamber.

4. In an apparatus of the character described, the combination of a lower and an upper heat-treatment chamber, a quenching tank below the said chambers a chute interposed between the delivery end of one of said chambers and the tank, means for feeding articles rogressivel throu h the last-men- I tioned c amber an for de ivering them to in one or more vertically arranged thcup r portion of said chute, a series of lateral y spaced arms arranged to 0 rate ots in said chute thereby to receive articles delivered to the upper and means operative y the article-feeding means for movin the said arms in position to receive the articles delivered to such portion of the chute and for moving the said arms downwardly in said slot or slots, and

a conveyor arranged below said arms and having a series of laterally-spaced members arranged toreoeive the articles from said arms, the said conveyor extending in operative relation to the other heat-tree V ment chamber.

5. An apparatus for the heat-treatment of articles comprising a lower heatetreatment chamber and an up her and means for tingthe same, means for conveying articles ro ively through.

the first-mentioned c am r, a quenching tank below the delivery end of the firstmentioned chamber, a conveyor extending from said quenching tank to the upper chamber, the said conveyor having series of laterally spaced lifting members, a chute for receiving articles from the deliv' endof the first mentioned chamber and hvering I them into the said tank, in operative relation to said lifting members, article-receiving is adapted to receive tromthe rtionof said chute,

r heat-treatment cham-v delivery end of the first-mentioned chamber and support and conduct them along said chute and deliver them to the appropriate lifting members, and means controlled by the feeding of the articles through the first mentioned chamber for operating the said arms.

6. An apparatus for the heat treatment of articles com rising a lower heat-treatment chamber and an upper heat-treatment chamber and means for eating the same, means for conveyin'g'articles progressively through the first-mentioned chamber a quenching tank below the delivery end 0 the first mentioned from said chamber, a conveyor exten quenching tank to the upper camber, the said conveyor having series of laterally spaced lifting members, a chute for receiving articles from the delivery end of the first mentioned chamber and delivering them into the said tank in operative relation to said lifting members, adapted to receive articles from the delivery end of the first-mentioned chamber and support and conduct them along said chute and deliver them to the appropriate liftin members, and means for operating the sai arms. 7. In an apparatus of the character described, the combination of a lower heattreatment chamber, an up r heat-treatment chamber, a quenching below the lower chamber, a hearth in the lower chamber, oneor more beams each operable through a slot in said hearth, means for raising and lowerand reciprocating the said beam or beams w ereby articles to be heated in the first chamber may be conducted step by step thl'OltlEh the said chamber to the delivery end ereof, a vertically-slotted chute at the delivery end of the hearth and leading to said tank, a conveyor extending from said tank in operative relation to the upper chamber, the said conveyor having laterallyspaced series of liftin members arranged to pass through the slots in the said chute, arms pivotally supported adjacent the rear of the said furnace and am to be moved u .wardly and downwardly in the slots of t e chamber, ahearth in the lower chamber, one.

or more beams-each operable through a slot in said hearth, means for raising and lowering and reciprocating'the said beam or beams w e reby articles to be heated in the first chamber may I be conducted step-bythrough the said chamber to the delivery and article-receiving arms heat- Ill thereof, a chute at the delive end of the hearth and leading to said tan a conveyor extending from sa1d tank in operative relathrough said chamber,

tion to the upper chamber, the said conveyor having laterally-spaced series of lifting members, arms pivotally supported adjacent the rear of the said furnace and arranged to be moved upwardly and downwardly thereby to receive the articles as they are delivered, successively from the said hearth and to support theminproper position for delivery to the lifting members and means for operating the said arms.

9. In a furnace having a heat-treatment chamber and means for feeding articles successivel through said chamber; to the delivery en thereof, a quenching tank, a vertically slotted chute extending from the delivery end of said chamber to said tank, arms pivoted so that their ends may be moved through the said slots and upwardly into article-receiving position and downwardly into delivering position adjacent the lower end of said chute, a conveyor, having laterall spaced series of lifting members operab e throu h said slots and adapted to receive articlis idropped from the ends of said arms, and means controlled by the feed of the articles through the said chamber for operating the said arms.

-10. Ina furnace having a heat-treatment chamber with a hearth and means for moving articles to ,be heat-treated. progressively a transversely-arrange series of arms adapted'to receive articles delivered by said moving means from the rear-end of said hearth and -to deliver the same to a conveyor, means operated 'by such article-moving means for moving the arms into receiving position when the beams are moved rearwar'dly and for lowering the a said arms into delivery position when the beams are moved forwardly, and means normally blocking. the delivery of articles from said hearth, the last mentioned means being adapted to be moved out of blocking relation to said hearth when the arms are in articlereceiving position. v

11. In a furnace having a heat treatment chamber with a hearth and one or more beams for moving articles to be heat treated successively through said chamber, movable means adapted to receivecarticles delivered by said beams from the rear end of said hearthand to deliver the same to a conveyor,- means for moving the last-mentioned means into receivingk position when the beams'are move'd rearwardlyand for lowering the same into delivery position when the beams are i -to said hearthwhen the receiving and delivering means are in article-receiving position.

of articles, the combinationof a chamber having a hearth, one or 'more beamsfor feeding articles progressively through said chamber, the said beams being movable to positions above and below said hearth, with means for moving the beams rearwardly when in elevated position and forwardly when in depressed position, there being a delivery chute at the rear end of said hearth and ,the said beams being arranged, when in their upper and rearward position, to deliver the rearmost articles to said chute, an L-shapcd member pivoted adjacent the rear end of said hearth with its upper end nor mally blocking the delivery of an article therefrom to said chute, and laterally spaced arms movable into article-receiving and article-delivering position, one of said arms being arranged to engage the said blocking member as said arms are moved into receiving position, thereby to operate the blocking member and to permit the articles to be delivered from the hearth to the said arms.

13. In a furnace for the heat-treatn'ient of articles the combination of a chamber, meansfor feeding articles progressively through said chamber, an L-sha'ped member pivoted adjacent the rear end of said hearth with its upper end normally blocking the delivery of an article therefrom, means movable 'into article-receiving and article-delivering position, the said means being arrangedto engage the said blocking member when moved into receiving position, thereby to operate the blocking member and to permit the arti les to be delivered from the hearth to he said receiving and deliverin' means.

14, 11 an apparatus of the'character dcscribed,-the combination, with. a first and a second heat-treatment chamber and means said hearth and the said tank, means for feeding articles to be heated progressively through the first of said chambers and for delivering the same to said chute, a conveyor extending from-the quenching tank in operative relation to the second chamber, the said conveyor having series of laterally-. spaced lifting members, and receiving means, operable by the movement of the said feeding means, for receiving the articles successively as they are. delivered 'from the hearth and delivering them to the lower portion of the chute and in roper operative relation to the lifting me be conveyor.

15. A furnace com-prising a heat-treatment chamber having a slotted hearth, one

rson the said means or more beams each operable in a slot of the ing position, and connections between the hearth, means for moving the said beam or beams vertically, and longitudinally relative to said hearth wherebyv the said beam or beams are projected above the hearth to lift the articles thereupon, are moved rearwardly, are lowered to deposit the articles in advanced position upon the hearth, and are moved rearwardly to initial position, the rear ends of the beams being so located as to dislodge from the delivery end'of the hearth the rearmost article thereon by the move ment of the said beams rearwardly, an L- shaped member pivotally su ported at the rear of the delivery end of the hearth with its front portion adapted to block the delivery of the rearmost article from said hearth, anda work-receiving arm'movable toward and from the delivery end of the hearth and adapted to engage the said member when moved to work-receiving osition thereby to rock, the member away m ts work obstructin position and permit the article to'be de ivered from the hearth by the movement of said beam'or beams.

16. A furnace comprisin a heat-treatprogressively through said chamber, an L- shaped member pivotally supported at the rear of the delivery end of the chamber with its front ortion adapted to block the de livery of t ie rearmost article therefrom, and a work-receivin member movable toward and from the d ivery end of the hearth and adapted to-rengage the said blocking member when moved to work-receiving position,

thereby'to rock the latter member away from its work-obstructing ition and rmit the article to be delivere from said 0 amber.

17. A furnace comprisin a heat-treatment chamber havin a slot-te hearth, one or more beams eac operable in a slot of the hearth, meansv for moving the said beam or beams vertically and longitudinally relative to said hearth whereby the said beam or beams are projected above the hearth to lift the articles thereupon, are moved rearwardly, are lowered to deposit the articles in advanced position upon the hearth, and are moved rearwardly to initial position, the rear ends of the beams being so located as to dislodge from the delivery end of the hearth the rearmost article thereon by the movement of the said beams-rearwardly, an L- sha d member pivoted adjacent to the rear f ti hearth and adapted to swing by avity about its pivotal sup rt thereby to lock with its front end the (l livery of an article from the rear end of said hearth, rollers on the lower end of said member, receiving arms movable toward and from the delivery end of the hearth and each arranged, when moved.

to receiving position, to en a e a roller on said member thereby to roc t e member to move its front portion out of work-obstructsaid arms and the said beams for raising the same to work-receiving position in time to receive the article dislodged by the rearward movement of the beam or beams and to lower the arms to delivering position before the next rearward movement of the beam or beams.

g 18. A furnace comprising a heat-treatment chamber, means for feedingkarticles progressively through said cham r, an L-shaped mem er pivoted adjacent to the rear of the chamber and adapted to swing by gravity about its pivotal support thereby to block with its front end the delivery of an article from the rear end of said chamber, receiving means movable toward and from the delivery end of the chamber and arranged when moved to receivin .position said member there y to rocir the same and move its front portion out ofwork-obstructing position, and connections between the said receivin means and the feeding means for moving e former means to work-receivmg position in time to receive an article der. 19. A heat-treatment furnace comprising an intermediate combustion chamber, a heattreatment chamber below said combustion chamber and a heat-treatment chamber above said combustion chamber, a conveyor in the upper chamber, means for feeding ar- 4 ticles successively thro the first-mentioned chamber, a quen tank beneath the first-mentioned chamber, a conveyor to engage the livered by the feeding means from the chamment chamber, means for coding art cles be 4 for conducting articles from saidtank to the first mentioned conveyor and means for delivering articles from c first mentioned chamber to the tank and to the second conveyor.

20. In a furnace having a chamber for the heat treatment of articles and. a quenching tank below the delivery end of said chamber means for feeding the articles to be treated progressively through said chamber, movable means adapted to receive the articles delivered from said chamber and to lower the same into said tank, and means controlled by the article-feeding means.

21. In a furnace having a chamberfor' the heat treatment of articles and a quenching tank below the delivery end of said chamber means for operating said means for feeding the. articles to be treated progressively through said chamber, arms adapted to receive the articles delivered from sal chamber and to lower the same into said tank, and means controlled fe'edm means for operating and arms.

' 22. u an apparatus of the character deby the article- III scribed, the combination, with a lower heats treatment chamber, an upper heat-treatment chamber, and a combustion chamber between the said heatstreatment chambers, of

- for feeding articles pro essively throu h the first heat-treatment c iamber, a uenc ing tank below the delivery end of t e first heat-treatment chamber, a conveyor having its lower end in said tank and its u per end arranged in operative relation to tie upper heat-treatment chamber, and means for delivering articles successively from the first heat-treatment chamber into the quenching tank and on the portion of the conveyor therein. a

23. In an apparatus of the character described, the combination, with a lower'heattreatment chamber, an upper heat-treatment chamber, and a combustion chamber between the said heat-treatment chambers, of means for feeding articles proiressively through the first heat-treatment c amber, a uenching tank below the delivery end of t 1e first.

heat-treatment chamber, a conveyor having its lower end in said tank and its upper end arranged in operative relation to the upper heat-treatment chamber, the said conveyor being provided with article-supporting members, and means for delivering to the quenchingitank and to the members on said conveyor articles discharged from the first heattreatment chamber. f

In testimony whereof, I hereunto aflix my signature.

"HARRY P. Mac ANN.

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