US1500609A - Annealing leer - Google Patents

Description

H. L. DlxN ANNEALING LEER July 8 1924.

Filed urch 2a 2 ShegtS-Sheet l' IIIIII July 8, 1924 1,500,609

H DIXON ANNEALING LEER Filed March 2S: 1921 2 sheds-shea a Patented .uly I 8,' 1924.

UNITED srarasraraNT oar-ica HENRY L. mxomor DonnoN'r, l

or Ummm, rmsynvnmn,

PENNSYLVANIA, Assioma To l ANNEALING Application mea :laren 2s, 1921-. semina-153,218.

Figure 1 igure 3 is a view simllar to Flgure 2,'

showing a modification; c

Figure 4 is a view similar to Flgure l,

showing another modification; and l Figure 5 is a section oni/the line V-V of re 4. v Y

y invention has relation to annealing leers, and more particularly to leers of the' muflie type.

The object of m invention is to provide means of practical, and eiiicient character whereby a leer of this type may be heated electricall in a manner to insure the maintenance o the desired temperatures throughout the different portions of the leer.

Referring first to that of my invention shown in Figures 1 and 2, the numeral 2 designates the annealing chamber of a glass annealing leer, and 3 a portion of the tunnel part of the leer. The heating chamber 2 1s provided with ay series of internal flues 4 ,which extend entirely around the heating chamber and are preferably spaced longitudinally one from the other. lThese figues are shown as formed of hollow tiles of any suitable character.

In accordance with my invention, each of these flues is lilled with some material 5 which will act as a resistance conductor for electric currents. For this purpose, I emloy a graphite in more or less comminuted orm, or a mixture of carbon and silica commonly-known as kryptol, or any other suitable material of this same general character. Each flue is provided with terminals or electrodes 6 by means of which an electric current may be assed through the resistance material thereln. In the construction shown in Figures 1 and 2, the electrodes or terminals are shown as extending intoA opposite `tively around theA flue arranged in multiple.

lower corners ofthe lues,

intended to divide and take two paths n. L. Dixon company, n conroaArIoN or rnNNsYLvamn. f

the current beingv n through the resistance material from one Y electrode to the other. The current flow beportioned, of the resistance mixture or its density.- The electric connections leadin to the electrodes are shown as grouped Ain ca les, one of which current mayl be controlled. y ever, limit myself 'to any particular arrange- 1s carried through a rheostat 7 by which th'ei G5 I do not, how.-

ment of the electric circuits, as these may 'l be arranged in any suitable in the art and, for each Hue regulation by any vwell In Figure 3, applied to a leer'which is generally similar to that shown in Figures 1 and 2, except that the heating. chamber 2i has a-iat instead of an arched top;

manner known 1f deslred, the current flow known means.

may be capable of separate- .the terminals or electrodes I have shown my invention .f

6, instead of' coming in at opposite corners of the furnace,come in at the central ortion of the bottom the other.

In the form of myy invention shown in of each ue, suitable insulatf '80 8 being interposed .between f Figures 4 and', instead of providing thel I heating chamber' 2b tinuous spacey 9 between the inner and outer walls of the chamber, which is lled with a resistance material. Preferably, this space 9 is of decreasing sectional area from the re# l discharge end of the heatingefect av gradual reduction ,y

05 are shown'as from the provision of means whereby the.

leer may beV electrically heated, the arrangement being such that the temperatures-.may be readily controlled andheld at the desired with a series of'separate flues extending/around it, I provide a conpoint. vThe use of electric heat for. the purpose also eliminatesall danger-of inyury to the ware being annealed, due to any products of combustion getting into the annealing chamber. The resistance material, being confined in aninclosed s ace or spaces, 1s

excluded from .the atmosp ere, thereby preventing its combustion and enabling it to be used for an indefinite period.

It will be readily understood that my invention is susceptible of many other modications within the spirit and scope of the appended claims.

'I claim:

1. An annealing leer of the mulile type,

having a heating chamber, and means for electrically heating said chamber, said means being of diferent characteristics in different portions of the chamber whereby dierent temperature conditions may be maintained in different' portions thereof, substantially as described.

2. A glass annealing leer of 'the muile type, having a resistance ymaterial in the walls ofits heating chamber, said material bein of different conductivity in diierent portions of the furnace, and means for passing electric currents in multiple through such material, substantially asdescribed.

3. An annealing leer of the muffie type, having a `heating chamber` and a tunnel' in communication therewith, and, means extending substantially entirely around the heating chamber for electrically heating the same, said means having dierent portions of its body of different characteristics to aliv tomatically regulate .the current iow therethrough, substantially-as described.

4. A glass annealing leer of the mule type, having a resistance material in the walls of its heating chamber, said material being of diii'erent conductivity in different 4portlons of the furnace, substantially as described.

In testimony whereof, have hereunto setmy hand. l

emNaY L. Dixon.

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