US1518323A - Heating furnace - Google Patents

Description

-Dec. 1924. 1,518,323

w. H. HAZARD HEAT I NG FURNACE Filed Aug. 22, 1921 2 Sheets-Sheet 1 4 i l 24 a; .50 Y

I r V V v i v a I l Patented 9, 1924.

UNITED STATES PATENT OFFICE.

WILLIAM H. HAZARD, F JANESVILLE, WISCONSIN, ASSIGNOR T0 GENERAL MOTORS CORPORATION, OF DETROIT, MICHIGAN, A CORPORATION OF DELAWARE.

HEATING FURNACE.-

Application filed August 22, 1921. Serial No. 494,269.

To all whom it may concern:

Be it known that 1, WILLIAM H. HAZARD, a citizen of the United'States of America, and a resident of the city of J anesville, county of Rock, and State of Wisconsin,

have invented certain new and useful Improvements in Heating Furnaces, of which the following is a full, clear, concise, and exact description, such as will enable others skilled in the art to which the invention relates to make and use the same, reference I being made therein to the accompanying,

drawings, which form a part of this specification.

My invention relates to high temperature furnaces, and particularly to such as are used to heat articles that are to be forged and to which a part has to be welded, such as plowshares which commonly have a sep- 2 arate point welded to the main body of the share.

The principal object of my invention is to provide an improved furnace consisting of two heating" chambers, one. in which the article is heated all over to a temperature suitable for forging, and in the other of which the heat is concentrated on a small ortion to which another piece of metal is to be welded.

A further object of my invention is to pro .vide an improved furnace having a means for continuously moving the articles or devices that are to be heated from an opening in one end wall of the furnace to an opening in the other end wall.

A further object of my invention is to provide an improved furnace wherein the heating chambers are so arranged that the article that is to be heated, upon entering the furnace, encounters only a moderate temperature and is gradually moved along by a conveying means into a region of higher temperature; so that when it reaches the end of the furnace it has reached its maximum temperature. This prevents the metal of the article heated from being crystallized or otherwise injured, as it would be if it were heated too quickly.

A further object of my invention is to provide an improved furnace consisting of two ch mbers, one of which has a considerably higher temperature than the other;-

and wherein the surplus heat of the hotter chamber is used to partially bring the temperature of the other up to a given degree.

A further object of my invention is to provide an improved furnace consisting of two chambers, one of which is heated to a higher temperature than the other; and wherein the two chambers are constructed in such a way that the one which generates the higher temperature may be removed and another built in its place without disturb-v ing the chamber which generates the lower temperature; as it is obvious that the chamher having the higher temperature will burn out much sooner than the other.

With the above and other objects in view, my invention consists of an improved high temperature furnace and subsidiary parts and auxiliary features thereof illustrated in the accompanying drawings and hereinafter described and claimed; and in such variations and modifications thereof, within the scope of the concluding claims, as willbe obvious to those skilled in the art to which my invention relates.

Referring now to the drawings wherein the preferred embodiment of my invention is illustrated Figure 1 is a sectional plan View of my improved furnace, taken upon the line 11 of Figure 2. p

Figure 2 is a sectional side view and is taken upon the line 2-2 of Figure 1.

Figure 3 is a sectional view taken upon the line 3-3 of. Figure 1.

Figure 4 is an end elevation as seen from a pi osition to the right of Figure 1.

igure 5 is a sectional view taken upon the line 55 of Figure 1.

In the drawings, the reference numeral 10 designates a heating chamber 18 in which articles to be heated such as plowshares 11 are brought to a for ing heat, while 12 is another heating cham r in which the points 13 of the shares 11 are brought to a welding heat. The chamber 10 is formed by fire brick walls 14, a roof 15 and floor 16; while the chamber 12 is formed by walls 17, a roof 18 and floor 19. Throughthe wall 14 and into the chamber 10 runs a gas burner 20 from which comes the flame which supplies the forgin heat; and through the walls 17 and into t e chamber 12 runs a gas burner 32 from which comes the flame whichosupplies the welding heat.

Through the chamber 10 runs a conveyor comprising two conveyor chains which are made up of links 21 held in roper relation to each other byrbraces 22. 11 each link 21. is a lug 23 upon which the plowshares 11 rest. The conveyor chains are driven by the two sprockets 24 through the shaft 25 and run around the two idler sprockets 26, mounted on the shaft 27. In the furnace the links 21 run upon pipes 28, through which cold water is pumped, which keeps the pipes 28 from being burnt out by the extreme heat and keeps the conveyor chain from becoming too hot.

In the walls 14 and 17 are openings 29 in the form of long narrow slots alongside which the conveyor runs and through which the points 13 of the shares 11 pass. The shares are placed upon the conveyor chain at the left-hand end of the. furnace and pass thereinto through an opening 30, and are moved very slowly toward the right. When they first enter the chamber 10 the heat is not very intense, but as they move to the right the temperature increases. By the time they approach the chamber 12 the whole share has been brought to a forging heat. Therefore when the point 13 enters the chamber 12 it is not subjected to a severe change in temperature, as it is already very hot and the difference between the forging and welding heats is not enough to affect the composition of the metal.

At the right-hand end of the furnace is an opening 31 through which the operator of a dro hammer removes the red-hot shares. If; then performs the forging and welding operations and returns to the furnace, for another plowshare. In case the operator should fail to remove one of the shares through the opening 31, it will pass through the o nin 33 in the right-hand walls 14 and 1 of tie heating chamber 10, 1.2 and cause a balanced fireproof trap door 34 to swing outwardly, and run off the end of the conveyor chain and drop to the floor. The door 34 serves to retain the heat within the chambers 10 and 12; and the lugs 23 on the links 21 of the conveyor chains are provided to keep the shares up off the chains, so that the heat will be allowed to circulate under the shares as much as possible.

The roof 15 of the chamber 10 curves downward toward the conveyor chain side of the furnace, and the frame shoots from g the burner 20 diagonally across the cham ber and is deflected downwardly by the roof and around the shares 11, heating them gradually to a forging heat. In the chamber 12 the flame shoots from the burner 32 ed opening;

directly on the under side of the points 13 of the shares 11, heating them to a whitehot heat for welding.

It will be seen that as there is considerable pressure within the chamber 12, quite an amount of the heat therein will be forced out through the openings 29 into the chamber 10, thus helping to heat this last-mentioned chamber.

Operated by the heat within the chamber 12 is a thermostatic regulator 35 which con trols the burner 32, thus keeping the temperature in the chamber at the proper degree for welding; as it is very necessary that the welding temperature should stay the same, while the forging temperature in the chamber 10 may vary considerably without affecting the operation of the furnace as a whole. The chambers 10 and 12 are shown quite short in order that the views illustrating the invention will not be inordinately long. They may as a matter of course be made of any length, and ordinarily their length will be such that more than three plow shares at a time will be in the chamber 10, and more than two at a time will be having their points heated in the chamber 12, in order that both the forging and the welding heatswill be imparted to theshares gradually as they move through the furnace.

Having thus described and explained my invention I claim and desire to secure by Letters Patent:

1. In a furnace of the class described, a heatingchamber and means for heatin the same; a second heating chamber partitioned off from but which second chamber is in permanently open communication with said first-mentioned chamber through a restrictmeans for heating said second chamber to a temperature higher than that of said first mentioned chamber; andmeans for moving articles to be heated through the furnace.

2. In a furnace of the class described, a heating chamber and means for heating the same; a second heating chamber in ermanently open communication with sai firstmentioned chamber through a slot extending along the same; means for heating said second chamber; and a conveyor adapted to move articles to be heated through the furnace and which conveyor extends alongside the slot aforesaid.

I11 a furnace of the class described, a heating chamber and means for heating the same; a second heating chamber in rmanently open communication with said first mentioned chamber through a slot extending throughout the length of said second chamber; means for heating said second chamber to a temperature higher than that of said first-mentiond chamber; and a conveyor extending through openings provided in the wall of the furnace and through said first-mentioned chamber and alongsidethe slot aforesaid, and adapted to move articles to be heated through the furnace.

4. In a furnace of the class described, a-

heating chamber and means for heating the same; a second heating chamber in ermanently open communication with sai firstmentioned chamber through a slot extending alongside the same; means for heating said second chamber to a temperature hi her than that of said first-mentioned cham er; a conveyor for articles to be heated extending through the furnace and alongside the slot aforesaid; and an opening provided in the wall of the furnace and located opposite said slot.

5. In a furnace of the class described, a heating chamber and means for heating the same; a second heating chamber structurally independent of said first-mentioned chamber and in permanently open communication therewith through an opening; means for heating said second chamber; and a conveyor for articles to be heated extending through said first-mentioned chamber and adjacent the opening aforesaid.

6. In a furnace of the class described, a heating chamber and means for heating the same; a second heating chamber in permanently open communication with said firstmentioned chamber; means for heating said second chamber to a temperature higher than that of said first-mentioned chamber; and means for moving articles to be heated through said first-mentioned chamber, and portions only of the articles through the permanently open communication aforesaid and into said second-mentioned chamber.

7. In a furnace of-the class described, a heating chamber and means for heating the same; a second heating chamber in permanently open communication with sald first mentioned chamber; means for heating said second chamber to a temperature hi her than that of said first-mentioned cham er; means for moving articles to be heated through said first-mentioned chamber, and portions only of the articles through the permanently open communication aforesaid and into said second-mentioned chamber; and an opening provided in the Wall of the furnace adjacent said second-mentioned heating chamber and through which the heated articles may be removed from the furnace.

In testimony whereof I afiix my signature.

WILLIAM H. HAZARD.

Images