US1037910A - Removable ceiling for enameling-ovens. - Google Patents

Description

Patented Sept. 10, 191.2.v

@w- 1 e y t. Reovexwwevwc. .-4 4wd Mm GEORGE WILLIAM HIZEE, or DETROIT, MICHIGAN.

REMOVABLE CEILIG FOR ENAMELINGOVENS.

Specification of Letters Patent. y

Patented Sept. 10, 1912.

, Application 1e`d October 2, 1911. Serial No. 652,338.

To all whom it may concern:

Be it known that I, GEORGE W. HIZER, a citizen of the United States, and a resident of Detroit, in the county of Wayne and State of Michigan, have invented a new and useful Removable Ceiling for Enameling- Ovens, of which the following is a specification.

This invention relates to means for pre-k venting flakes or small granules of soot or other undesirable materials from falling from the ceilings of enameling ovens onto the wet enamel coating of sheet metal, and its object is to provide a removable false ceiling for such ovens, which ceiling can be easily and thoroughly cleaned when desired.

In the accompanying drawings Figure l is a perspective view of an enameling oven. Fig. 2 is a transverse section, and Fig. 3 is a longitudinal section of the same. Fig. 4 is a detail of a small hanger which may be employed in this oven.

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

The enamel on mud-guards, hoods, and

bodies of automobiles, and of other high-k class sheet metal work, is baked onto the metal in ovens which are heated to a temperature of from 250 to 350 degrees Fahrenheit. This heating is done, as ka rule, by means of gas flames, and because of imperfect combustion, a certain amount of lampblack or soot is formed. l This lamp-black or soot seems to unite with the vapors of the solvent of the enamel and attaches itself to the walls and ceiling of the oven. After several months, small particles of this material detach themselves from the ceiling and fall onto the soft enamel of the goods within the oven. The result is that specks, warts, and blisters vare formed on the enamel, often necessitating the entire removal of the enamel by means of a-hot acid bath. Y

It is customary to periodically clean the ceiling and the supporting bars by means of wire brushes and thorough scrubbing, but for some reason not understood, a perfect rain of such particles falls during the first and often second baking following such cleaning. The probability is, that these fine particles are pushed into the cracks and between overlapping plates which forxn the ceiling, during the cleaning, and are then released during the baking because of the expansion and other movement of the ceill ing plates due to .the great increase in temperature. Whatever be the reason, it is the universal experience of those skilled in this art, that the enamel ofsubstantially the entire batch of the articles being enameled at the first baking following a cleaning of the oven, is imperfect, and it is also the universal experience that a very large proportion of such articles must be renameled.

The invention set forth in this application is embodied in a false or removable ceiling which can be absolutely cleaned. The preferred form is a series of sheet metal plates overlapping at edges and ends, and of such length that they can be easily taken out of the oven and put into a hot bath of weak acid, which removes every trace of the soot and other undesirable materials.

The oven shown in the accompanying drawing has a top 1, sides 2, bottom 3, front 4, back 5 and doors 6 of any desired material and construction. The heating gas is conducted into the oven by means'of pipes 7 and escapes through the small holes 8 shown in Fig. 1. .The flow may be controlled by valve 9. Extending across between the walls 2 are supporting members 10, preferably I- beams, upon which rest a series of metal plates 11 having upturned edges 12, and the second series of plates 13 having downturnededges 14. These plates maybe of any desired length, and overlap, the outer ends of the end plates preferably resting on channels 15 secured to the back 5 and the front 4 of the oven. Small stirrups 16 may carry the bars 17, andthe hooks 18 hang over these bars 17 and support the pieces 19 of work, mudeguards being shown. As these stirrups 16 are easily removable, the bars 17, which may be also formed of short lengths, can also be taken down and placed in the acid bath. The I-beams 10 may then berushed and if desired washed with weak aci It has been found that in ovens provided with false ceilings such as shown in the drawing, the consumption of gas is much less than in those not so provided, owing to the fact that a dead air space is formed between the top of the oven and the sheet metal ceiling, which space substantially prevents the radiation of the heat upward. The plates 11 and 13 will be cleaned as often y as necessary to prevent too great an accunecton with I-beams 1 0, for the plates may` be of any desired shape and Vsize and the supporting beams may be of any Cross section.

what I cla-iin as. my invention anddesire to secine by Letters Patent is In an enameling even, the combination With the sides, and top of the oven, of a series of beamsv extending across, the' oven and Having now explained my constructionf spacedfrom theltop, a seijies of removable ofstnjinps depending from said beams, and

having. overlapping edfes and ends, a series of stirrups Vdepencln'ig afseijiesof removable bars carried by said ystifups, said bars adapted to receive the Irene said bea-Ins, and

supporting hooks of the metal articles being enanele'd.

Intestimony whereof, I have signed this application in the presence of tWo subscribing Witnesses.

l ,GEORGE WILLIAM HIZER. Witnesses HARRY RANGER,

GEO. F. STANDLEY.

Copies of this patent maybe obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C.` p V l

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