US2370954A

US2370954A - Heat-treating furnace

Info

Publication number: US2370954A
Application number: US496683A
Authority: US
Inventors: Raymond J Guba
Original assignee: AUDUBON WIRE CLOTH CORP
Current assignee: AUDUBON WIRE CLOTH Corp
Priority date: 1943-07-28
Filing date: 1943-07-28
Publication date: 1945-03-06
Anticipated expiration: 1962-03-06

Description

March 6, 1945. R, J GUBA 2,370,954

HEAT-TREATING FURNACE Filed July 28, 1943 f 2 Sheets-Sheet 1 WITNEJ$ hr 07 [lbw/J 4 I I n TTTT lvr Ma'r ch e; 1945. .R, J UBA 2,370,954

HEAT-TREATING FURNACE Filed July 28, 1943 2 Sheets-Sheet 2 Q w rlvsa's; WW 1 /f ,mbma J6 T EY Patented Mar. 6, 1945 HEAT-TREATING URNACE I Raymond J Guba, Philadelphimla... assignorto h Audubon-Wire Cloth Corporatioma corporation of New Jersey Application July 28, 1943, Serial No; 496 683 13 Claims. (01; zit-g1) The invention relates to a heat-treating furnace and is directly specifically to an improve-. ment in the structure, of the conveyor employed for transporting articles therethrough duringth heat-treating operation. I

In the construction of many types of furnaces I as well as resist th abrasive action of the hearth,

it is relatively expensive, thus making the cost of manufacture and maintenance of the-conveyor ;an important item in the ultimate cost of -the articles which are heat treated.

Inasmuch as the conveyor is .usually arranged so that the loaded run thereof is draggedover the furnace hearth, the wire spirals of which it is constructed are subjected to a great amount of wear by reason of thehigh abrasiveaction of the castings or the refractory bricks used. in lining the tunnel and thus forming the floor or hearth.

- This is particularly true under the present war program in view of the efforts of the manufacturersof ordnance and other war materials to reduce the time and cost of manufacture of such materials by using castings in a rough or unfinv verse contraction of the conveyor itself when a under tension. other objectsand advantages of ishedstate for the furnac hearth. The extreme wear on the conveyor spirals as they are. dragged over a hearth made of rough or unfinished castings results in excessive damage to the spirals and premature failure of the conveyor.-

Itis therefore one of the principal objects of the present invention to provide such a furnace with a spiral wire. conveyor which .is so constructedthat the spirals are not directly subjected to the abrading action of the hearth. ,Another objectof the invention is the provision, in ,a

woven wire conveyor, of means for resisting endwise contraction and expansion of the wire spirals. A further object of the invention is the provision, in a woven wire conveyor, ofmeans which v not only serves to prevent wear uponone surface thereof,.but also toresist longitudinal contrac .tion and expansion ofthespirals of which-the conveyor is formed and thereby prevent. transthe improvement will begapparent from the following description, taken with the accompanying conveyors with the, present improvement incorporated therein; and x ,Fig. -6,is an enlarged. detailed view of a portion of, the structure shown in Fig. 1, and illustrating thegmanner in which the improved conveyor cooperateswith the furnace hearth and with the rollers which support theoperation run of the conveyor. l l I ,-.While the invention may be utilizedwith other types ,of heat-treating, furnaces, it is illustrated in Figs, 1 and 6 of .the drawings with a furnace lll in whichvthe articles, II to be. heat treated are transported. through .a, tunnel l2 during .the treating. operation. Such at nnel is usually lined with'separate units I3 which may be metal castings or refractorybrick. In any case the articles l l--aregenerally transported through the tunnel I'Zby means 'Of an endless conveyor H which is so arranged thatthe run which transports the arti: cles is dragged over the tunnel floor or hearth l5 1 and is supported at, its oppositeends bysuitable means such as therollers I6. v

In order to eliminate the wear upon the lower surfaceof theconveyor H as .its active run is draggedover the furnacehearth l5, means are of contact withthe hearth, this means also serving to prevent longitudinal expansion and contraction of thespirals and thereby, prevent transverse contraction, of the; conveyor when under tension. Itis importantthat some means be utilized for preventing endwise, contraction of the coils in view of the tension applied to the conveyor and the high temperatures to which itis subjected when the furnace is in use.

The improvement may be utilized with various forms ofconveyor of the wire spiral. type, some such forms'being shown in Figs. 2, 3, 4 and 5 of the drawings. Theconveyor illustrated in Fig. 2 is formed ofwirespirals of the same twist. interwoven in such a manner that the bights I8 along one edge of each spiral overlapwithin the bights I9 of the adjacentspiral to receive a con nector rod 20 in a manner well understood in the and having one of its runs dragging over said hearth to transport articles through said furnace,

' and-a wire cross rod extending throughout the length of each of said coils on the face adjacent said hearth to protect said coils against abrasion.

and having its opposite ends secured to the endf turns of said coils to resist endwise contraction of said coils.

3. In a heat-treating furnace having a hearth over which articles are transported, an endless conveyor having one of its runs dragging over said hearth to transport articles through said furnace and comprising a plurality of helical coils of wire successively arranged in interlapping relation, a connecting rod extending through the overlapping portions of adjacent coils, and a cross rod extending throughout the lengthof each of said coils on the face adjacent said hearth to protect said coils against abrasion and having its opposite ends secured to the ends of a connecting rod and to the end turns of a coil to resist endwise contraction of said coils.

4. In a heat-treating furnace havin a hearth over which articles are transported, an endless conveyor having one of its runs dragging over said hearth to transport articles through said furnace and comprising a plurality of helical coils of wire successively connected together to form a flexible structure, cross rods arranged at intervals on the face of said conveyor adjacent said hearth, each of said cross rods extendingthroughout the length of a coil to protect the coil against abrasion and having its opposite ends secured to the end turns of the coil to resist endwise contraction of the coils.

5. In a heat-treating furnace havin a hearth over which articles are transported, an endless conveyor having one of its runs dragging over said hearth to transport articles through said furnace and comprising a plurality of helical coils of wire successively arranged in interlapping relation, a connecting rod extending through the overlapping portions of adjacent coils, cross rods arranged at intervals on said conveyor, each of said cross rods extending throughout the length of one of said coils on the face adjacent said hearth to protect the coil against abrasion and having its opposite ends secured to the ends of a connecting rod and to the end turns of a coil to resist endwise contraction of said coils.

6. A conveyor belt for transporting articles over the hearth of a heat-treating furnace or the like, comprising a plurality of helical coils of wire successively connected to form a flexible structure, and cross rods arranged at intervals on the surface of said belt operating adjacent said hearth to provide wear-resisting elements for maintaining said coils out of contact with said hearth, each of said cross rods extending throughout the length of one of said coils on the outer face thereof and having its opposite ends secured to the end turns of the coil to resist endwise contraction of the coil.

7. A conveyor belt for transporting articles over the hearth of a heat-treating furnace or the like, comprising a plurality of helical coils of wire successively connected to form a flexible structure, and a wire cross rod extending throughout the length of each coil on the face thereof operating adjacent said hearth to maintain said coils out of contact with said hearth and having the opposite ends thereof secured to the end turns of the coil to resist endwise contraction of said coils.

8. A conveyor belt for transporting articles the coils together, and a wire cross rod extending throughout the length of each coil on the face thereof operating adjacentsaid hearth to maintain said coils out of contact with said hearth and having the opposite ends thereof secured to the end turns of the coil and to the ends of a connector rod to resist endwise contraction of said coils.

9. A conveyor belt for transporting articles over the hearth of a heat-treating furnace or the like, comprising a plurality of helical coils of wire having the turnsof each interlapping the turns of adjacent coils to form a continuous fabric, a connector rod extending through each coil between the turns thereof'and the interlapping turns of each adjacent coil, and a wear resisting rod extending from end to end of each of said coils on the face thereof operating adjacent said hearth to maintain said coils out of contact with.

said hearth and having its opposite ends secured to the opposite ends of an adjacent connector rod and to the end turns of the associated coil.

10. A conveyor belt for transporting articles over the hearth of a heat-treating furnace, said belt being formed from a succession of flexibly connected units each comprising a helical coil of wire, a connector rod extending through the bights at one edge of the coil and having its opposite ends secured to the opposite ends of the coil, and a wear-resisting rod on the face of the coil operating adjacent said hearth for maintaining the coil out of contact with said hearth and having its opposite ends secured to the end turns of the coil.

l1. A conveyor belt for transporting articles over the hearth of a heat-treating furnace, said belt being formed from a succession of flexibly connected units each comprising a helical coil of wire, a connector rod extending-through the bights at one edge thereof and having its opposite ends secured to the opposite ends of the coil, and a 'wear resisting rod arranged centrally on the face of the coil operating adjacent said hearth for maintaining the coil out of contact with said hearth and having its opposite ends secured to the end turns of the coil and to the opposite ends of said connector rod.

12. In a woven wire conveyor for transporting articles over the hearth of a heat-treating furarticles over the hearth of a heat-treating furnace, a belt element comprising a flattened helical coilof wire, a connector rod extending through the bights of the turns along one edge of said coil, and a cross rod arranged lengthwise on one of the outer faces of said coil to maintain the coil out of contact with said hearth and protect said coil from wear and havingits opposite ends secured to the opposite ends of said coil and to the opposite ends of said connector rod to resist endwise contraction of said coil.

RAYMOND J. GUBA.