US1211884A

US1211884A - Furnace-door.

Info

Publication number: US1211884A
Application number: US5413015A
Authority: US
Inventors: Lawrence S Schmidt
Original assignee: SCHMIDT MCCORMICK Co
Current assignee: SCHMIDT-MCCORMICK Co; SCHMIDT MCCORMICK Co
Priority date: 1915-10-05
Filing date: 1915-10-05
Publication date: 1917-01-09
Anticipated expiration: 1934-01-09

Description

L. S. SCHMIDT.

FURNACE DOOR.

APPLICATION men OCT. 5, 1915.

1,21 1,884. Patented Jan. 9, 1917.

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LAWRENCE S. SCHMIDT, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR T0 SCHMIDT- MOCORMIGK COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

FURNACE-DOOR.

Specification of Letters Patent.

Patented Jan. 9, 1917.

Application filed October 5, 1915. Serial No. 54,130.

To all whom it may concern:

Be it known that I, LAWRENCE S. SCHMIDT, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and tate of Pennsylvania, have invented certain new and useful Improvements in Furnace-Doors, of which the following is a specification.

My invention relates to improvements in furnace doors, and more particularly to water cooled furnace doors.

The invention is designed to provide a door comprising sheet metal plates suitably Welded together, and more particularly a door of this type constructed in such manner as to reduce the liability to damage by heat and at the same time facilitate the construction of the door, together with a simplifying of the structure to provide for efficient water circulation.

To these and other ends, the present invention consists in the improved construction and combination of parts hereinafter fully described, illustrated in the accompanying drawings, and more particularly pointed out in the appended claims.

In the accompanying drawings, in which similar reference characters indicate similar parts in each of the views, Figure 1 is a.

view in elevation showing a preferred form of door structure, the new showing the mside face of the door with parts broken low sheet metal frame composed of an outer plate member 10 and an inner plate member 11. Each of these members is preferably formed from an integral sheet of metal, the two sheets of metal being practically integrally connected by welding along lines presently referred to.

As shown in Figs. 5 and 6, the blanks for members 10 and 11 are each rectangular in form, the excess of length over width being provided for the formation of angularlyprojecting flanges, those of member 10, in-

tom of the door, the bending lines being 7 indicated at a in each case. The blank for member 11, however, is of larger area than member 10, owing to the fact that said member 11 is designed to provide a receiving space or chamber for the refractory lining material 13, and in addition thereto, enters into the formation of the hollow top and bottom portions. This material receiving space or chamber is formed in member 11 by depressing the central portion thereof;- this depression being provided in a con venient manner as by the operations of suitable dies and press, the bottom of the depression being preferably formed concavoconvex or bilged, as at 11, the walls 11 of the depression being preferably of the character shown for the purpose of retaining the refractory lining in position, the portion of the blank surrounding the depressed central portion forming faces 11". Members'lO and 11 are each also formed with an opening 14, preferably circular in contour, the walls of these openings being flared, the direction of flare being opposite in the two members, these flared portions not only serving as spacing elements when the members are assembled, but, in addition, forming Walls of an opening through which a tool, such as a bleeder bar, a stirring rod, or a test spoon may be entered through the door.

The members 10 and 11 are preferably jointed together by welding along the lines of the meeting edges of the two members. These edges are as follows :At the top and bottom, the lines of weld are indicated at b in Fig. 2, flanges 11 extending outwardly from a face 11 to meet the top and bottom edges of member 10; at the sides, the lines of welding are indicated at c in Fig. 3, flanges 10 extending inwardly and meeting the face portion 11 of member 11. This arrangement also places a line of weld from the outer to the inner side of the door at each of its outer corners. In addition, the flared edges of openings 14 are welded together as shown in Fig. 2. By this construction, the lines of weld which ex tend lengthwise of the door at the top and bottom are spaced a maximum distance away from the rear face of the door and from the heat of the furnace. This is a front face of the door.

. uniform.

great advantage in doors of this type and especially with respect to the lower portion of the door, as it is this portion which is subjected to the intense heat as the door is moved over the furnace opening each time theodoor is raised and lowered. It will be noted that my construction presents a non-welded water cooled' face to the furnace opening at the lower portion of the door.

The lines of Weld for the sides, which lines extend vertically, are not exposedto the direct action of the heat at any time, the sides of the door being protected from this heat by the door frame; hence, it is not necessary to locate these lines of weld at or near the By this construction, in addition to locatingthe lines of weld at points where liability to damage from direct heat is practically eliminated, I dispense with a considerable amount of welding heretofore necessary in doors of this character and also place thelines of weld where the expansion and contraction of the opposing metals are substantially This construction further provides the space 12 for the refractory lining, heretofore mentioned, and owing to the fact that the corners thereof are not welded as heretofore, the bad effects due to the expansion and contraction ofthe refractory mass at or on the corners is entirely eliminated. I Another important and characteristic fea ture of the present invention is the fact that the lines of weld are located in different vertical planes'passing through the door,

thereby enabling the strength of the linesof weld to be reinforced by non-welded portions and also preventing any damage that may possibly be caused to one line of weld being communicated to another line of weld. For instance, the line of weld indicated by b is in a different vertical plane than the line of weld 0 and an injury to line 6 would not be communicated to line 0. The weld line b is strengthened by the bends b which are located substantially inthe vertical plane of weld lines b,"but which are located in an unwelded portion of member 10. Obviously, a similar effect is produced in connection with weld lines a by the bends 0' of member 11.

Water for cooling the door is introduced through a pipe 15 preferably extending downwardly from the top of the door to a point adjacent the bottom,the open end of the pipe being located within a chamber formed by a member 16 angular in'cross section, and which has'one edge welded to the bottom flange 11 as best shown in Fig. 2,

' said memberlfi preferably having its opposite edge in, contactwith the inner face of member 10, the intermediate portion preferably lying in close contact with a wall of ber through the opening 16.

depression 11 Member 16 is preferably provided with a plurality of openings 16 both in its vertical and horizontal sides, these openings permitting the water introduced through pipe 15 to pass into the portion of the door which forms the surrounding wall for the edges of the refractory material, and also into the space between the two members at the back of the refractory material, the outlet being preferably arranged at the upper portion of the door, as indicated for instance at 17, in Fig. 1. This arrangement practically produces a settling chamber 18 at the bottom of the door, the water entering this chamber from pipe 15 and being required to pass out of this cham- 7 As a result, sediment would tend to collect in this chamber, especially in view of the fact that the flanges 10 and 11 are inclined outwardly toward the outer face of the door, thus tending to form a pocket at the bottom of the door within which this sediment could collect. For the purpose of readily clearing this. chamber of sediment, I may provide suitable openings 19, normally closed in suitable manner, by means of which a tool may be introduced into the chamber for cleaning out the sediment.

1 preferably protect the line of weld which joins the opposing edges of openings lt by a structure indicated at '20, and shown on an enlarged scale in Fig. 4, this structure comprising a pair of

members

20 and 20" adapted to be connected together by one or more connecting devices, such as screws or bolts 21, these members combinedly inclosing the line of weld and the major portion of the flared parts surrounding this opening. The

members

20 and 20 are annular in form, and hence not only act to protect the line of weld, but also to reinforce the openings and flared portions, tending to prevent damage to the members at this point. As will be obvious, these

members

20 and 20 may be sufliciently large as to withstand wear under the movements of the bleeder bar or other tool for a great length of time, there being no relative movement between the sheet metal members and the

members

20 and 20 and consequently little liability of damaging the sheet metal members. While I prefer to provide this opening circular in contour, it will be obvious that this contour may be varied as desired, the essential being that the structure 20 shall completely inclose the outer face of the line of weld which connects the members 10 and 11 at this point as well as the flared portions.

lVhile I have herein shown and described a preferred construction, it will be readily understood that changes and modifications therein may be required or desired to meet the various conditions of service, and I, therefore, desire to be understood as reserving the right to make any and all such changes as may be found desirable or necessary, in so far as the same may fall within the spirit and scope of the invention as expressed in the accompanying claims.

lVhat I claim is 1. A furnace door comprising a hollow sheet metal structure formed of outer and inner sheets united together at their edges to form a body chamber and communicating hollow side, top and bottom portions, the outer plate having side bends only, said inner plate having top and bottom bends entering into the hollow top and bottom portions, the uniting line of the bottom portion disposed on the lower outside edge of the door.

2. A furnace door comprising a hollow sheet metal structure formed of outer and inner sheets united together at their edges to form a body chamber and communicating hollow side, top and bottom portions, the outer plate having side bends only, said inner plate having top and bottom bends entering into the hollow top and bottom portions, said members being united by welding, with the welding lines limited to opposed edges of diflerent plates.

A furnace door comprising a hollow sheet metal structure formed of outer and inner sheets united together at their edges to form a body chamber and communicating hollow side, top and bottom portions, the outer plate having side bends only, said inner plate having top and bottom bends entering into the hollow top and bottom portions, the uniting line of the bottom por tion being on a different vertical plane from that of the side portions.

4i. A furnace door comprising a hollow sheet metal structure formed of sheets or plates shaped and united together at their edges to form a body chamber and com municating hollow side, top and bottom portions, the uniting line of the bottom portion being on a different vertical plane from that of the side portions and disposed at the lower outside edge of the door.

5. A furnace door comprising a hollow sheet metal structure formed of sheets or plates shaped and united together at their edges to form a body chamber and communicating hollow side, top and bottom portions, one of said plates bent to form a flange constituting the outer peripheral wall of the bottom portion and the other bent to form a flange constituting the outer peripheral wall of a side portion when the plates are assembled.

6. A furnace door comprising a hollow sheet metal structure formed of outer and inner sheets united together at their edges to form a body chamber and communicating hollow side, top and bottom portions, the outer plate having side bends only, said inner plate having top and bottom bendsentering into the hollow top and bottom portions, and a depression to receive refractory material, said depression having its bottom bilged.

7. A furnace door comprising a hollow structure formed of shaped plates or sheets of metal united together at their edges to form a body chamber and hollow side, top and bottom portions communicating with said chamber, a settling chamber located at the bottom of and within the structure and having open communication with the said body chamber and the hollow portions, the peripheral wall of said structure having openings leading to said settling chamber to permit removal of sediment, and means for delivering a cooling agent to the settling chamber.

8. A furnace door comprising a hollow structure formed of shaped plate members united to form a liquid-receiving structure, said members having openings, the walls of said openings being flared in opposite directions to provide meeting edges adapted to be united by welding when the members are assembled, and a reinforcing structure for protecting said uniting line, said reinforcing structure comprising a pair of elements on opposite sides of said uniting line, each element extending throughout the length of said line and having a face adapted to fit the flared portion of one plate, and means for securing said elements in position.

9. A furnace door comprising a hollow structure formed of shaped plate members united to form a liquid-receiving structure,

, said members having openings, the walls of said openings being flared in opposite directions to provide meeting edges adapted to be united by welding when the members are assembled, and a reinforcing structure for protecting said uniting line and the walls, said reinforcing structure comprising a pair of complemental ring-like members having faces adapted to abut each other on a line approximating the uniting line of said plate members, each member having a face shaped to fit the flare of one plate, and means for securing said complemental members together to provide a structure extending laterally in both directions beyond the uniting line of the plate member.

In testimony whereof I affix my signature in presence of two witnesses.

LAWRENCE S. SCHMIDT. WVitnesses:

ALEX. S. MABoN, W. G. DOOLITTLE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D G.