US1394891A - Electric heating apparatus - Google Patents

Description

H. GEISENHNER. ELECTRIC HEATING AEPARATUS. APPLICATION FILED JUNE 21. 1920.

1,394,891. Patented 061;. 25, 1921.

Figi.

lo O i// v IIIIIIII I Inventor: Fig. 5. \/z' Henn.; G'eisenhner`,

b5 gw/. MIL.

' His fltorne.

HENRY GE'TsENnNER, or scHnNEcrADY, 'NEW YORK, marc COMPANY, A CORPORATION or AssIGNOB. :no GENERAL ELEC- NEW Yonx.

ELECTRIC HEATING APPARATUS.

Specification o1' Letters Patent.

l Patented Oct. 25, 1921.

Application med :une 21, 1920. smal Nb. 39am.

To all whom it may concern.'

Be it known that I, HENRY GEISENHNER, a citizen of the United States, residing at Schenectady, in the county of Schenectady, State of New York, have invented certain new and useful Improvements in Electric Heating Apparatus, of which the following is a specification.

My invention relates to electric heating apparatus and particularly to devices arranged to heat a plurality of articles by passing current therethrough in series.

The object of my invention is toprovide a device which shall be simple and ,rugged in construction, and which shall enable a high rate of output to be maintained without danger of burning the articles to be heated.

In my prior VPatent No. 1,323,751, dated December 2, 1919, I have described and claimed a method and apparatus for heating rivets and the like in series in a manner that insures a uniform product to be secured without skill on the part ofthe operator. According to the present invention the capacity of the machine is increased while maintaining the advantages of series heatily invention will be better understood from the following description taken in connection with the accompanying drawings and its scope will be pointed out in the ap ended claims.

1 eferring to the accompanying drawings Figure 1 is a perspective view of my heating device with circuit connections to a source of current diagrammatically indicated; Fig. 2 is a detail view showing the electrode construction and this figure shows a rivet to be heated inserted between the stationary and movable electrodes; Fig. 3 represents a modified form of electrode construction; Fig. 4 represents the use of the apparatus as a soldering iron heater, and Fig. 5 represents the preferred electrode construction where the device is to be used for heating soldering irons and the like.

Referring to Fig. 1, electrodes 1, 2, 3 and 4 are mounted respectively on pivoted 'arms 5, 6, 7 and 8. Any convenient arrangement may be provided for independently moving the electrodes 1, 2, 3 and 4. This means is represented as a foot lever 9 connected to each electrode through an operating rod 10 having an insulating joint 11 therein. The

movable electrodes 1 and 2 are represented as coperating with a stationar electrode or conducting member 12, and t e movable V14 is secured to the frame of the apparatus with curved contact faces which is represented as an angle iron structure comprising front legs 16 and 17 ,. rear legs 18 and 19, and suitable bracing members. The bars 5, 6, 7 and 8 are mounted on the cross piece 20, suitable insulation 21 being provided to insulate each bar, from the frame work. The plate 14 is adjustably secured upon the frame work by means of a wing nut 22 and a bolt arranged in a slot 23 provided in each end of the member 14. Holes 24 are provided in the plate 14 to permit a ready circulation of air to assist in keeping the electrodes cool. Each of the electrodes isindicated as -provided with a corrugated surface to assist in `keeping the same cool. An article to be heated, represented as a rivet 25, is showninterposed between movable electrode 2 and stationary electrode 12, and rivets 25 are also .represented as interposed between movable electrodes 3 and 4 and the stationary electrode 13. The movable electrodes are provided of various lengths to be interposed between them and the stationary electrodes.

Current is supplied to the electrodes by means indicated as a transformer whose secondary winding 26 is connected to the bars 5 and 8. The current flows in series through the electrode and interposed articles to be heated, the circuit being traced from one terminal of the secondary winding 26 to the electrode 1; through the conducting member l2 to the electrode 2; through the flexible connection 27 to the electrode 3, and through the conducting member 13 to the electrode 4, which is connected to the other terminal of winding 26. The heating current may be adjusted by varying the number of turns of the primary winding 28A of the transformer.

In order to maintain the circuit completed whenever one of the articles 25 to be heated is removed, the apparatus is constructed and arranged so that the lowering of the movable to enable articlesl electrode will complete thecircuit. According to the preferred embodiment of my 1nvention this is accomplished by providing to construct the electrodes as shown 1n projections 29 on each of the conducting members, or electrodes 12 and 13, to engage the corresponding movable electrode when it is lowered. In Fig. 1 no rivet 1s 1nd1- cated between the electrodes 1 and 1 2, and electrode 1 isA consequently shown 1n the lowered position with the circuit completed between the electrodes l and 12 through -the projection 29 which may be integral with electrode 12. In Fig. 2 a rivet 25 1s shown interposed between electrodes l'and 12, the circuit through projection 29 belng broken at this time. This construction enables the apparatus to be used to heat one or any number of rivetsless than the total number of pairs of colnlerating contact surfaces on the electrodes. he auxiliary contact 29 in practical operation very quickly becomes covered with scale so that a substantial contact resistance is furnished at this point which prevents burning of anylrivets which may be left in circuit.

Fig. 3 shows a modified arrangement in which the projection 29 is bolted to the electrode 12 instead of being made integral therewith, as shown inFig. 2. I may in some Ainstances make theprojection 29 of iron or other material of substantially higher resistance than the copper electrodes 1 and 12, although this refinement in construction will generally be unnecessary.

Fig. 4 represents the use of my heating apparatus as a soldering iron heater. The solderin iron 30 is interposed between the copper ectrodes 1 and 12 just as the rivet 25 isinterposed in Fig. 2. The contact resistance between the copper soldering iron and the copper electrodes is so low that considerable sparking will take place when the circuit is interrupted, although the sparking is harmless. I have found that this arrangement will satisfactorily heat a solder-A ing iron in about one-fifth of the time necessary with a gas furnace.

In order to reduce the sparking I prefer 5 when the device is to be used princi ally as a soldering iron heater.. In this gure the soldering iron 30 is interposed between carbon blocks 31 and 32 which are' clamped in the electrodes 1 and 12 by means of screws 33 and 34. In order to heat a soldering iron with the arrangement shown in Fig. 5 in the same length of time that is required with the arrangement shown in Fig. 4 the voltage ofthe. primary circuit must be raised to about twice the value neciessary with the arrangement shown in Fig( 4.

hile,I have shown and described certain specific embodiments of my invention Fig.

it will be obvious to those skilled in the art that'many modifications and variations are possible, and I therefore aim .in the appended claims to cover all such variations and modlfcations as fall within the spirit of miv invention.

W at' I claim as new and desire to secure4 'by Letters Patent of the United States, is

1. An electric heating apparatus of the 'class descrlbed comprising a plurality of independently movable conducting bars, electrodes mounted on said bars and conductlng means between which and the movable electrodes the articles to be heated are adapted to be interposed, said conducting means being arranged to complete a series circuit through said electrodes and articles to be heated, and means whereby said electrodes and conducting means coperate to complete the hircuit whenever an interposed article is removed.

2. An electric heating apparatus of the class'd'escribed comprising a plurality of electrodes provided with a -nlurality of pairs of contact surfaces, said electrodes being arranged to be connected in circuit with a source of current, and arranged to complete a series circuit from such source through said electrodes and articles to be heated interposed between'said contact surfaces, and means arranged to complete the circuit through said electrodes when an interposed article is removed from between a pair of said contact surfaces.

3. An electric heating device of the class described comprising a luralit of electrodes between which t e artlcles to be heated are adapted to be interposed, means for supplying a current in series through said electrodes and interposed articles and means arranged to complete the circuit whenever an interposed article is removed.

4. An electric heating apparatus of the class described comprising a lurality of independently movable electrodes, and a conducting member between which andthe movable electrodes the articles to lbe heated are adapted to be interposed whereb a current ma flow in series through sai electrodes an the articles to be heated, characterized by the fact that the electrodes are constructv weasel other electrodes of said pair when said electrodes are not held apart by an interposed article to be heated.

6. An electric heating device of the class described comprising a plurality of pivoted. arms, means whereby said arms may be independently raised and lowered, an electrode mounted on each of said arms, conducting means arranged in coperative relationship to said movable electrodes, said electrodes and conducting means being provided with contact surfaces between which articles to be heated are adapted to be interposed and means on said conducting means adjacent each movable electrode arranged to engage the same and complete a circuit of appreciable resistance between said electrodes and conductin means when said electrode is moved to its lowest position.

An electric heating device of the class described comprising a plurality of movable arms, means whereby said arms may be independently moved, an electrode mounted on each oi said arms, conducting means. ar ranged in coperative relationship to Said movable electrodes, said electrodes and conducting means being provided with contact surfaces between which articles to be heated are adapted to be interposed, circuit connections whereby current may be passed in se ries through said electrodes, conducting means and interposed articles to be heated, and contact members on said conducting means arranged adjacent a plurality of said electrodes to engage the same to maintain the circuit completed when the articles to be heated are removed from between the corresponding contact surfaces..

8. An electric heating device of the class described comprising a plurality of pairs of pivoted arms arranged side b side, means whereby said arms may be lndependently operated to raise and lower the same, an electrode mounted on each of said arms, a stationary electrode arranged below and in coperative relationship to each pair of said movable electrodes whereby an article to be heated may be interposed between each of said movable electrodes and the coperating stationary electrode, means whereby the outside electrodes may be connected to a source of current and means for electricall connecting the adjacent electrodes of a jacent pairs, whereby current may be passed in series through said movable electrodes, stationary electrodes, electrical connecting means and interposed articles to be heated, and contact devices arranged on said stationary electrodes to engage said movable electrodes when in lowered position to maintain the circuit completed whenever any of said interposed articles are removed.

In witness whereof I hereunto set my hand l this 18th day ci June, 1920.

HENRY GEISENHNER.

Images