US762417A - Combined arch-plate and shield. - Google Patents

Description

Nb.-762,417. PATENTED111N314,1904.v

F. JOHNSON.

COMBINED ARCH PLATE AND SHIELD.

' rrrrrrrrrrrrrr ED NOV. 11, 1903.

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W m um I W/i 56,5: .Eurezifi UNITED STATES Patented June 14, 1904.

PATENT OEEIcE.

COMBINED ARCH-PLATE AND SHIELD.-

SPECIFICATION forming part of Letters Patent No. 762,417, dated June 14, 1904.

Application filed November 11, 1903. Serial No. 180,658. (No model.)

To (tZZ 1072 0771, it iii/my concern.- 7

Be it known that I, FREDERICK J OHNSON, a citizen of the United States, residing at South Chicago, in the county of Cook and State of Illinois, have invented a new and useful Combined Arch-Plate and Shield, of which the following is a specification.

My invention relates to a combined archplate and shield which is employed to support an arch during construction an d to protect the mechanics from the extreme heat usually present where it is intended to be used.

My invention is particularly designed to be used in repairing the arches of charging-openings in smeltingfurnaces, but may be used for any kind of similar work.

In smelting-furnaces a power -charging mechanism is employed by means of which a large bucket filled with scrap-iron is pushed into the charging openings and after being emptied inside the furnace is again withdrawn through said opening. WVhile this bucket is being passed through the charging opening, either the bucket or the scrap-iron extending out of the bucket occasionally strikes the edge of the said opening accidentally, and thus seriously mutilates the brickwork forming the contour of the opening. In actual practice it is found that the arches forming the upper side of the charging-openings are most frequently broken. This multilation must be repaired while the furnaces are in operation to enhance their efficiency. It is necessary to protect the mechanics while repairing the mutilation from the extreme heat within the furnace. Heretofore the mechanic was protected by a temporary brick wall'built into the chargingopening, and after the multilation was repaired the brick wall had to be removed. My invention obviates the necessity of building any temporary protecting-wall whatsoever.

My invention consists of providing a port able protectingwall composed of any suitable material, as cast-iron, fire-brick, or asbestos, and arranged to fit the charging-openings. The charging-openings in a furnace or set of furnaces are all the same size, so that a protecting-wall made to fit one will fit all. I prefer to provide the protecting-wall with an arch-supporting plate, although this is not absolutely necessary. I believe I am the first person to construct a portable protecting-wall for'si'nelting-furnaces and lay claim to such a device broadly. I prefer also and have shown in the drawings that the portable protectingwall be moved into place by the charging mechanism.

It requires several hours by the present mode of repairing these arches to get the protecting-wall into position, while by my invention the same can be accomplished in a few minutes.

It will be understood that radical changes may be made in the form and construction of this device without departing from the spirit of the invention.

I have illustrated in the drawings forming a part of this specification a simple construction of one form of my invention as applied to a smelting-furnace.

Figure 1 is a front elevation of a portion of a furnace, showing several charging-openings. Fig. 2 is a vertical section through one of said openings, showing my invention adapted thereto, and Fig. 3 is a perspective view of the arch-plate and shield.

Similar reference characters refer to similar parts throughout the several views.

The front wall 5 of the furnace is provided with aplurality of charging-openings 6, which are usually rectangular, with an arch 7 forming the top side. In Fig. 1 is shown the ordinary doors 8 to normally close the openings 6 and arranged to be guided in the vertical ways 9. In Fig. 1 one door 8 is shown raised and my improved arch-plate and shield in position, but with the mechanism for holding the same removed. I v 7 While I prefer to hold the arch-plate and shield in proper position bythe ordinary charging mechanism, I desire to have it understood that any convenient mechanism may be provided for this purpose.

As previously stated, the arches 7 are accidentally'broken or partly broken during the regular operations, and these arches must be repaired while the fires are burning within the furnace.

My device consists of the arch-plate 10, which serves to support the brick or similar work in place during construction, and the shield 11, which substantially closes the opening 6 completely.

I prefer having the vertical flange 12 on the inner edge of the arch-plate 1O serve as a stop to rest the arch-bricks against during construction.

Obviously the shield 11 will protect the mechanics on the exterior of the furnace from the extreme heat on the interior of the furnace.

When the device is handled by the ordinary charging mechanism, the front face of the shield 11 is provided with two parallel lugs or ridges 13 and a perforation 14 to lit cooperating parts on the charging mechanism.

In operation when an arch 7 is in need of repair thedoor 8 is raised out of the way. The arch-plate 10 and shield 11, which are preferably integral, are placed and held in proper position, care being taken to have the outer face of the flange 12 flush with the inner face of the wall The mechanics can now proceed with the necessary repairs without any great inconvenience on account of the heat on the interior of the furnace. As soon as the repairs are complete the device is removed from the opening by the mechanism already referred to.

Having thus fully described my invention,

what I claim, and desire to secure by Letters Patent of the United States, is

1. A combined arch-plate and shield, said arch-plate supporting an arch over a furnaceopcning and said shield closing said opening.

2. A combined arch-plate and shield, comprising a shield to close the opening in a furnace, an arch-plate to support an arch over said opening and an upward-extending flange on the inner edge of said arch-plate.

3. In an arch-plate and shield the combination of a fire-shield to [it into the opening of a furnace, an arch-plate integral with the upper end of said shield to support an arch above said opening, an upward extension on the inner edge of said arch-plate, and two flanges on the outer face of said lire-shield with a hole in the shield between said flanges.

4. A combined arch-plate and shield, said arch-plate arranged to support an arch over a furnace-opening and said shield arranged to lit into said opening.

In testimony whereof I have signed my name to this specification, in the presence oftwo subscribing Witnesses, this 2d day of November, 1903, at Chicago, Illinois.

FRED. JOHNSON.

\Vitnesses:

R. J. JAGKER, A. U. DECKER.

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