Improved process op removing tin from sheet-metal
US RE3258 E
Description (OCR text may contain errors)
uert-i 51eme Wr Gaim., bv-a getest @fitta D. B. STURDEVANT AND B. HARMON, oF-CLirToN SPRINGSQNEW e. YORK.
Letters Patent-No. 75,809, dated lxifa/rchl 24, 1868; reissue No. 3,258, aged .Tanna/ry 5, 1869.
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The referred to in these Lettera Patent and making partldf the lame.
To all whom it 'ma/y concern;
Be it known that -we,D. B. STURDE vnnr and B. H. HARMON, of Clifton Springs, in the county of Ontario, and State of New York, have invented a certain new and useful Method of Removing Tin Coatings from Sheet-Metal; and we do hereby declare the following to be a full and exact description of the same, reference beinghad to the accompanying drawings,mak ing part of this specification. i
The figure' represents a central vertical section of anapparatus employed fot' carrying thesaid--invention into eect.
The object of this improvement is to remove tin coatings from sheet-metal, such, for instance, as tin scraps and old .tin-ware, 6to.
This invention consists in the combined use ot' hot air and steam or gases, or either, for softening the coating; also, in connection therewith, the employment of mechanical agitation for loosening and detaching the coatings from the scraps, as hereinafter set forth.
'l.he apparatus herein shown consists of a retort, having induction and eduction-air passages, afshaking grate, and a contracted bottom, employed in connection. with a water-receptacle beneath, for the generation of the'steam.
In the drawings, A indicates the retort, which may rest upon a furnace, B, or be otherwise connected with any apparatus by which heat may belinrparted.
It has a cover, a, which is removed for the insertion 0f the sheet-metal, and is also provided with a grate, C, for sustaining the metal, and for allowing free passage of the hot air and steam through it.
This grate is hung upon journals, and is thus made l to shake freely in the retort by means of a hand-crank,
b, extending out through the sides.
`An induction hot-air pipe, I), opens beneath the grate, and an eduction-pipe, E, extends from above it. The bottom of the retort is in funnel-ibrrn, and hasv a smallopening, c, as shown, and beneath this-opening rests a water-rece tacle, G, for the generation of steam.
The operation rs as follows:
The scraps of sheet-metal are placed upon the grate,
and bot air let onthrough pipe D, and 'steam through orce O. When heated, the grate is shaken, and the particles of tin, as they are melted, fall down through the open bottom into the receptacle beneath. While this action is taking place, the loose grate allows the mass to be thoroughly agitated, which is essential in the process toprodnce a thorough removalof Athe tin;
What we claim as our invention, and desire to secure Jy Letters Patent, isfl. The process herein described of removing coatings from sheet-metal, by the combined use. of hot air and steam, acting upon the mass in a closed retort, substantially as herein set forth.
2. The process herein described of removing tin coatings from 'sheet-metal, by agitating Athe metal whilev subjected to heat. l
3. The .process herein metal while subjected to the combined action of hot air and steam or gases in a .closed vessel or retort, substantially as herein set forth.
4. The combination, with a retort provided with a vibrator-y grate, or equivalent, of an induction-pipe below the grate, and an eduction-pipe above the grate,
I described of removing tin coatings from sheet-metal, by jarring or agitating the