US530019A - Box or furnace for electric heating apparatus - Google Patents
Box or furnace for electric heating apparatus Download PDFInfo
- Publication number
- US530019A US530019A US530019DA US530019A US 530019 A US530019 A US 530019A US 530019D A US530019D A US 530019DA US 530019 A US530019 A US 530019A
- Authority
- US
- United States
- Prior art keywords
- furnace
- slabs
- box
- carbon
- heating apparatus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005485 electric heating Methods 0.000 title description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 46
- 229910052799 carbon Inorganic materials 0.000 description 38
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 8
- 235000015450 Tilia cordata Nutrition 0.000 description 8
- 235000011941 Tilia x europaea Nutrition 0.000 description 8
- 238000010276 construction Methods 0.000 description 8
- 239000010439 graphite Substances 0.000 description 8
- 229910002804 graphite Inorganic materials 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 239000004571 lime Substances 0.000 description 8
- 239000000395 magnesium oxide Substances 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 150000002739 metals Chemical class 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 210000002832 Shoulder Anatomy 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 229910052570 clay Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 150000002505 iron Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 239000000615 nonconductor Substances 0.000 description 2
- 230000001105 regulatory Effects 0.000 description 2
- 230000000717 retained Effects 0.000 description 2
- 239000010454 slate Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
- F27D11/02—Ohmic resistance heating
Definitions
- My invention consists in an improved box or furnace for an electric heating apparatus
- FIG. 1 is a perspective view of a carbonholder connected with the furnace or furnacebox, the latter being in section.
- Fig. 2 is an enlarged sectional perspective view of the furnace, one end being omitted;
- Fig. 3 is a section through one partof the furnace-box, looking downward; and
- Fig. 4 is a top plan View of the furnace-box with the inner plate removed, and showing a slight modification in construction.
- Figs. 1 and 2 s 5 represent soap-stone slabs or slabs of slate, lava, or any suitable material, which is for ordinary purposes considered a refractory non-conductor of electricity, forming insulating slabs, which form the sides and ends, and top or bottom of the furnace, the bottom slab being omitted in Figs. 1 and 2.
- the insulated slabs s, 8, shown in Fig. 2 project somewhat below the other parts of the furnace so that when the bottom slab is put in position and is secured by bolts engaging with threaded sockets, it will not come in contact with any of the interior linings.
- 0 represents the slabs of carbon, or mixtures of carbon with clay, or may be such mixtures as are known as carbon, brick, or graphite brickbut which for the purposes ofthis invention fulfill all the requirements of a slab of pure carbon, two of which are secured to the insulating sides .9 by a screw-bolt d, taking into a threaded socket b.
- the inner slab c is recessed as shown, to receive the head of bolt d and protect it from the fire.
- the aperture it through the insulating sides 3 is continued through the carbon slabs 0, but made larger through said carbons for the purpose of preventing contact between the carbons between which the voltaic arc is formed and said slabs c, the hole h being made of such size through the insulating side 8 to be somewhat snugly closed by the arc carbons.
- refractory block such as lime or magnesia or graphite cut to fit between the inner carbon slabs c c and provided with shoulders to engage with the recess in said carbon slabs and thus protect the heads of bolts 01.
- three sides of the furnace indicated by 7 may be made of iron, the other side f being also made of iron and connected with the remainder of the box by screw-bolts e which pass through insulation 01, which is also interposed between the sides f andf', as clearly shown in the figure.
- this iron box be used, instead of the insulating slabs, it is advisable for the purpose of preventing short circuiting that the carbon slabs c, with which the side f is lined, shall not be in electrical contact with any other of thecaroon slabs c lining the other part of said box, as clearly shown in said drawing.
- outer side containing the air space is secured in position by bolts e engaging threaded sockets b.
- the furnace or furnace box constructed as described, may be used in connection with the carbon-holder exhibited by Fig. 1, where the letters E E represent two carbon holders, whose upper ends form nuts e, 6 one of which is tapped with a right hand screwthread. while the other is tapped with a lefthand screw-thread, to engage with screwthreads on shaft W, said screw-threads being of different pitch, and both nuts e, e are bored to fitand slide on guide-rods g, g.
- W represents a shaft journaled in said head h, h and lugs J J lying between guide-rods g g, and provided at one end with a hand'wheel G.
- the ends of shafts W outside of lugs J J are right and left-hand screw-threaded, the pitch of one of said screw-threads being about double that of the other, so that when by rotation of said shaft the nuts e, e are moved,
- the carbon-holders E E are adapted to hold carbons which project into the furnace or furnace-box through the passages h, the construction being such that the arc can be regulated.
- a furnace for electrically heating metals consisting of a box composed of separable parts secured together by bolts, having its sides and ends lined with double slabs of carbon, the lining of the sides and ends being insulated from each other, and having its top or bottom, as the case may be, lined with a refractory slab,such as lime, magnesia or graphite, substantially as shown and described.
- a furnace for electrically heating or welding metal consisting of a box formed of the refractory insulating slabs 8 provided with threaded sockets a, secured together by bolts 6 and lined with the carbon slabs c secured in position by the bolts d and threaded sockets b, and the lime or magnesia top or bottom, substantially as shown and described.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Details (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Description
. No Model.)
0. L. OOFFIN. BOX OR FURNACE FOR ELEGTRIG HEATING APPARATUS.
No. 530,019. Patented Nov. 2'7, 1894."
I VEJVTOQ J, riff/Il ill/r 14 M/ESSES gwm M6. QMJMW rrno STATES CHARLES L. COFFIN, OF DETROIT, MICHIGAN.
BOX OR FURNACE FOR ELECTRIC HEATENG APFARATUS.
SPECIFICATION forming part of Letters Patent No. 530,019, dated November 27, 1894.
Application filed March 9. 1893. Serial No. 465,323- (No model.)
To all whom it may concern.-
Be it known that 1, CHARLES L. COFFIN, of Detroit, in the county of \Vayne and State of Michigan, have invented a new and useful improvement in a Box or Furnace for an Electric Heating Apparatus, of which the following is a specification.
My invention consists in an improved box or furnace for an electric heating apparatus,
hereinafter fully described and claimed, reference being made to the accompanying drawings, in -\vhich Figure 1 is a perspective view of a carbonholder connected with the furnace or furnacebox, the latter being in section. Fig. 2 is an enlarged sectional perspective view of the furnace, one end being omitted; Fig. 3 is a section through one partof the furnace-box, looking downward; and Fig. 4 is a top plan View of the furnace-box with the inner plate removed, and showing a slight modification in construction.
In heating metals by the action of a voltaic arc, in a furnace, the intense heat tends to disintegrate the furnace, andIhave found by considerable use thatafurnace of considerable life can be made as follows:
Referring to Figs. 1 and 2 s 5 represent soap-stone slabs or slabs of slate, lava, or any suitable material, which is for ordinary purposes considered a refractory non-conductor of electricity, forming insulating slabs, which form the sides and ends, and top or bottom of the furnace, the bottom slab being omitted in Figs. 1 and 2.
It will be noticed that the insulated slabs s, 8, shown in Fig. 2, project somewhat below the other parts of the furnace so that when the bottom slab is put in position and is secured by bolts engaging with threaded sockets, it will not come in contact with any of the interior linings.
0 represents the slabs of carbon, or mixtures of carbon with clay, or may be such mixtures as are known as carbon, brick, or graphite brickbut which for the purposes ofthis invention fulfill all the requirements of a slab of pure carbon, two of which are secured to the insulating sides .9 by a screw-bolt d, taking into a threaded socket b. The inner slab c is recessed as shown, to receive the head of bolt d and protect it from the fire.
The aperture it through the insulating sides 3 is continued through the carbon slabs 0, but made larger through said carbons for the purpose of preventing contact between the carbons between which the voltaic arc is formed and said slabs c, the hole h being made of such size through the insulating side 8 to be somewhat snugly closed by the arc carbons.
1 represents a refractory block such as lime or magnesia or graphite cut to fit between the inner carbon slabs c c and provided with shoulders to engage with the recess in said carbon slabs and thus protect the heads of bolts 01.
WVhile the insulating slabs may be threaded to receive the bolts which fasten the sides and top or bottom of the furnace together firmly, I prefer to screw into said insulated slabs a thimble a which is screw-threaded on its outside to engage with the bolt, whereby repeated operations of the bolt or screw do not tend to wear off the threads on the insu= lated slab.
As shown in Fig. 3, three sides of the furnace indicated by 7, may be made of iron, the other side f being also made of iron and connected with the remainder of the box by screw-bolts e which pass through insulation 01, which is also interposed between the sides f andf', as clearly shown in the figure. If this iron box be used, instead of the insulating slabs, it is advisable for the purpose of preventing short circuiting that the carbon slabs c, with which the side f is lined, shall not be in electrical contact with any other of thecaroon slabs c lining the other part of said box, as clearly shown in said drawing.
In Fig. 4 the insulating sides sare retained for three sides and the fourth is made direct by two carbon slabs c, the outer one of which may be recessed to form an air space between them, as shown in the drawings, and in this construction care should be taken that said. carbon 0 forming one side of the furnace must not come in electrical contact with any of the carbon slabs lining any other side of the furnace. In Fig. 4 the outer side containing the air space is secured in position by bolts e engaging threaded sockets b.
By keeping all of the carbon slabs c on the different sides of the furnace out of electrical contact with each other, a short circuit between the are forming carbons is prevented, as this would interfere with the maintenance of the vol taic arc in its proper location. I have found by repeated trials that a furnace lined in this way with a refractory top, such as lime or magnesia, or graphite, and double carbon slabs at; the sides will last under continued use for a long time, the only thing which requires renewal being the inner carbon slabs, and by the construction shown these slabs can be usually renewed at the end of thirty or sixty days, or whenever too much eaten away by simply unscrewing the bolts e and bolts d,and putting a new carbon in place.
The furnace or furnace box, constructed as described, may be used in connection with the carbon-holder exhibited by Fig. 1, where the letters E E represent two carbon holders, whose upper ends form nuts e, 6 one of which is tapped with a right hand screwthread. while the other is tapped with a lefthand screw-thread, to engage with screwthreads on shaft W, said screw-threads being of different pitch, and both nuts e, e are bored to fitand slide on guide-rods g, g. W represents a shaft journaled in said head h, h and lugs J J lying between guide-rods g g, and provided at one end with a hand'wheel G. The ends of shafts W outside of lugs J J are right and left-hand screw-threaded, the pitch of one of said screw-threads being about double that of the other, so that when by rotation of said shaft the nuts e, e are moved,
the motion of one of said nuts will be faster than the motion of the other, so that one of the carbon-holders E E carried on said nuts 9 a will advance faster than the other to compensate for the greater rapidity of combustion of the positive carbon.
The carbon-holders E E are adapted to hold carbons which project into the furnace or furnace-box through the passages h, the construction being such that the arc can be regulated.
i/Vhat I claim as my invention, and desire to secure by Letters Patent, is-
1. A furnace for electrically heating metals, consisting of a box composed of separable parts secured together by bolts, having its sides and ends lined with double slabs of carbon, the lining of the sides and ends being insulated from each other, and having its top or bottom, as the case may be, lined with a refractory slab,such as lime, magnesia or graphite, substantially as shown and described.
2. A furnace for electrically heating or welding metal, consisting of a box formed of the refractory insulating slabs 8 provided with threaded sockets a, secured together by bolts 6 and lined with the carbon slabs c secured in position by the bolts d and threaded sockets b, and the lime or magnesia top or bottom, substantially as shown and described.
CHARLES L. OOFFIN.
Witnesses:
GERTRUDE H. ANDERSON, GEO. I-I. LOTHROP.
Publications (1)
Publication Number | Publication Date |
---|---|
US530019A true US530019A (en) | 1894-11-27 |
Family
ID=2598800
Family Applications (1)
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US530019D Expired - Lifetime US530019A (en) | Box or furnace for electric heating apparatus |
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- US US530019D patent/US530019A/en not_active Expired - Lifetime
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