US1557074A - Electric rivet furnace - Google Patents

Description

Oct. 13, 1925 am M a C Ffm P; L A N Aug. 3, N23- ELECTRIC RIVET FUHNACB WITNESSES:

INVENTOR ATTORNEY m m Af O 2 2 .FM a 2 2 5, m 3 1.. w 1 2 S 32N 3 *Y l r u 2 7 m 2, O m m 3 A M m Wl .IIlw \\\1 Mm m w 1 2 l A M 5, l B w w ,y 2l, a R u M m M w ma M. m m 5 l m E 6 ll|\l x A u um@ w fr 1L :.0 n 1 m 3. 1l M M WITNESSES: am@ af/Pn ATTORNEY Patented Oct. 13, 1925.

UNITED STATES PATENT OFFICE.

.AL-LIS I. IAUFARLAND, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR T0 WESTING- HOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.

ELECTRIC RIVET FURNACE.

Application led August 3, 1921.

To all whom t may concern.:

Be it known that I, ALLis M. hLxcFnn' LAND, a citizen of the Unite-d States, and a resident of Wilkinsburg, in the county ot' Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Electric Rivet Furnaces, of which thc following is a specification.

My invention relates to electric furnaces and particularly to electrically heated rivet furnaces, and it has for its object to provide a relatively simple and easily operated turnace adapted to heat simultaneously a relatively large number of rivets.

In practising my invention, I provide a metallic drum or casing inside of which is located a plurality of ilat carbonaceous plates operatively engaging each other over only a portion of their surfaces. The carbonaceous plates may be integral and substantially circular in contour, and be provided with a substantially radial slot or opening constituting a furnace 'chamber within which the rivets are located While being heated, or the carbonaceous plates may be divided and so shaped and located relatively to each other as to form a furnace chamber within which the rivets may be located while being heated. Resilient means is provided to compress the carbonaceons plates, and suitable contact terminals are provided to ermit of conducting the rurrent to and rom the resistor.

In the drawings,

Figure 1 is a View, partl in side elevation and partly in longitucinal section, of an electric rivet-heating furnace embodying my invention;

Fig. 2 is a view, in vertical lateral section, on the line II-II of Fig. 1;

Fi 3 is a view, in side elevation oi a. modi ed form of the device embodying my invention, certain portions being cut away, and

Fig. 4 is a View, in vertical lateral section, of the furnace illustrated in Fig. B, the section being taken on the line IV-IV thereof.

A furnace 5 comprises a cylindrical metallic drum or casing 6, radiall extending integral flanges 7 being rovi ed againm which heads 8 and 9 may bolted. luitm able supporting members 10 are provided Serial No. 489,428.

and secured to the casing 6 in any desired manner.

A lining ll of refractory insulating material is placed inside ot. the casing l. A plurality oil relatively thin carbonzueousI plates 1Q, substantially circular in contour, are placed inside ol the re tractory lining` l1 adjacent to each other. Each ot' the plates 12 is provided with a substantially radial opening or slot 13, an elongated furnace chamber 1K3 being formed by the plurality ot slots. Each ot the plates 12 has a thickened portion 14 immediately adjacent to the slot 13 so that the adjacent plates will operatively engage each other over only a relatively small area immediately adjacent to the chamber 13a. An opening 15 is provided in the casing 6 which registers with the open side of the chamber 13a, and a suitable hinged door 16 may be provided to close the opening 15 when the furnace is not in use or is being heated.

A plurality of carbonaceous blocks 1T and 18 and a metallic terminal plate 19 are provided at each end of the assembled group oi'plates 1Q. Currenteconducting leads Q() are suitably secured to the terminal plates 19 and extend outwardly through insulatingl bushings 21 in the heads 8 and 9.

The head El has an integral hollow evtension 22, in which is located a compres'. sion spring 23 and an adjusting screw 2l which permits oi'l adjusting the pressure upon the removable resistor plates l2.

lVhile the temperature al which the resister plates are operated to heat ri vets which may be placed in the chamber l?) is not high enough to cause destructive oxida tion by the surrounding air, there is, nevertheless, some oxidation and provision may be made for counteracting such action. il. container Q5 is located above the casing ll in which may be placed any suitable hydrocarbonaceons oil which is permitted lto drip through a tube 26 upon the heated resistor' plates and become volatilized thereby. The sooty vapor produced by this action is eltective to neutralize the oxidizing effect of the air by substantially preventino its coming in contact with the plates. A device to pr duce such lsooty vapors is described and claimed in a copending application, Serial No. 454,776, tiled March 23, 1921, by Gr. M,

Little and vassigned to the Westinghouse Electric & Mfg. Company.

In the modlfication illustrated in Figs. 3 and 4, a casino' 27, illustrated as substantially rectangular in lateral section, is provided With suitable supporting members 10. Heads 8 and 9 are bolited to the flanged portions 7 at the respective ends of the casplurality of refractory bricks or blocks 28 and 29 are located inside of the casing Q7 in side-by-side relation to provide a chamber in which may be located a plurality of carbonaceous resistor plates 30 and 31j The plates 31. are located between the parallel extending plates 3() and constitute the back wall otl the furnace chamber. Intermediate plates 32, substantially coextensivc horizontallyvivith the plates 30, may be provided to form a plurality of small heating chambers 13. The thickness of the plates 30 and 31 is greater over a small portion of the cross section of the plates immediately adjacent the chamber 13 so that the adjacent plates engage each other over only a small portion of their total area. This reduces the area traversed by the current, whereby the resistance of the current path is increased.

Means for compressing the resistor may comprise substantially the same elements as those described in connection with the device illustrated in Figs. 1 and 2. Similar cui rent-conducting means are also provided.

It may be noted that the device embodying my invention provides a relatively simple, easily assembled and easily maintained furnace for heating a plurality of rivets, the resistor of which is formed of a plural ity ot' carl'ionaceous plates, portions only of the surfaces of the adjacent plates being in operative engagement with cach other.

Various modifications may be made in the device embodying my invention without departing Vl'rom the spirit and scope thcrcol' and I desire that only such limitations shall be placed thereon as are imposed by thel prior art or are specifically set forth in the. appended claims.

l claim as my invention:

l. An electric furnace comprising a plurality of relatively thin refractory resistor members having substantially radial slots therein to form a furnace chamber.

2. An electric furnace comprising a plurality of relatively thin refractory resistor members having substantially radial slots therein to form a furnace chamber, the adjacent resistor members operativel engaging each other adjacent to said radia slots only.

3. An electric furnace comprising a lurality of relatively thin carbonaceous p as placed in side-by-side relation, and having substantially radially extending slots to form a furnace chamber, the adjacent plates having operative engagement with each other over only a narrow portion adjacent said slots, and means for permitting a curieut to traverse the engaging portions of the plates.

4. An electric furnace comprising a casing, a plurality of relatively thin carbonaceous plates located in side-by-side relation and having substantiall radial slots therein to form a furnace cham r and the adjacent plates operatively engaging each other over a narrow strip portion adjacent said slots, means for conducting current to and from .said plurality of plates, and heat-insulating material located between said casing and said plurality of plates.

5. An electric furnace comprising a casing, a furnace chamber formed by a plurality of relatively thin carbonaceous plates provided with slots and having their fiat sides operatively engaging each other over a narrow strip portion adjacent to the chamber formed by said slots, means for conducting current to and from said plates, means ior resiliently compressing said plates, and heat-insulating material located between said casing and said plates.

6. An electric furnace comprising a heatinsulating casing. a plurality of relatively thin carbonaceous plates located in said Casing and so shaped aml disposed as to provide a l'nrnace chamber extending transversely of .said casing, the lint sides of adjacent plates operatively engaging each other over a nar rou' strip portion adjacent to the chamber, resilient compressingr means for said plates and means for conductingr current to and from said plates.

ln testimony whereof, l have hereunto subscribed my name this 28th day of July 192i.

ALLIS M'. MAcFAltLANl).

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