US1144981A - Electric heater. - Google Patents

Description

E. N. LIGHTFOOT.

ELECTRIC HEATER.

APPLICATION FILED NOV. I8. 191|.

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Patented June 29, 1915.

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T0 all whom it may concern Be it known that I, EDWIN N. LIGHTroo'i,a citizen of the'United States, residing, at .N ew York, in the county ofNeW York and State .of vNew Yorlnhave invented new and useful Improvements in Electric Heaters, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

This invention relates to electric heaters One of the objects of the invention is to provide an' improved electric heater in which the circuit connections of the heating coils are changed by insertion of an object to be heated into the heater.

Another objectis to vprovide an improved means for controlling the circuit connections offthe lheating coils byi the insertion of an-object -to be heatedfiiito lthe heater.

Other objects andv advantages of the invent-ion will hereinafter appear.

The accompanying drawings illustrate an embodiment of the invention.

In the views of these drawings :#Figure 1 shows a 'partial longitudinal sectional View of a heater. Fig. 2 shows a'sectional view on line 2-2 of' Fig. l. Fig. 3 shows an end elevation of the heater. Fig. 4.- shows a diagram of one form of circuit connections.

In the construction shown, I have illus trated aheater of the type known as a combined curling r iron and greasepaint heater.

,i described in an application of Harry W.

Denhard, Serial No. 651,813, filed Oct. 31, 1911.l hAs in the construction shown in that application, I preferably provide a heating coil 1 which is Wound about a central sleeve 2 and insulated therefrom by a suitable. sheet of insulation 3, the sleeve and coil be.

ing carried in a substantially closed chamber between the end members 4 of a suitable frame, preferably provided with a bottom The frame 4 is preferably carried coil l a second heating coil or unit 7 is pre erably provided, being suitablycarried between ythe end members 4, and above this coil `or unit 7 suitable grease pans 8 are preferably A this portion of the heater, however,1 forms no part` of my invention and 1s the invention of Harry W. Denhard and described in his application heretofore referred to. Various other forms of construction may be used if' desired.

mounted. The construction ,of

Specication of Letters Patent. 1 Pantani-,ed June 29, @9115,

Application filed November 18, 1911. Serial No. 661,161.

In a preferred forni, I provide a, door 9` the door with an extension l2 having-lugs or other projections 13 on its end which extend substantially at right angles on appz site sides of the body of the extension (see Fig. 3). In a preferred form, the extension 12 is located near one of the ends of the pivot pin 10 as shown in Fig. 3. The projections or lugs 13 preferably carr a suit able sheet of insulation 14 and on t e oppon site side of said sheet of insulation are preferably provided with a conducting strip"vv 15 ugs which extends across the bottom of the 13 as shown in Fig. 3. These conducting strips may be` attached to the studs 13 by any suitable :means as,- for instance, by

screws 16', and these screws are preferably suitably insulated from the studs.

Upon the bottom plate 5 is preferably seated a plurality of resilient conducting strips 17 and 18 which are attached to the bottom plate by means of suitable screws, bolts or other devices 19 and 20: By preference, these resilient members are bent slightly upwardintermediate their ends as shown in Fig. 1, their free ends normally extending ina lane substantially parallel with the planeo' the bottom plate 5. Wheiil an 'object to be heated is inserted inV the sleeve 2, the door 9 .'s thrown back about its pivot l0 y until the conducting strip 15 bridges the two resilient contacts 1,7 and 18.

Conversely when the article to be heated is removed from the heating chamber, the door Sisthrown forward about its pivot by the resilient action of the contacts and returned` to its normal position closing'the opening to the lieatin chamber. If desired, I may fprovide an a ditional coiled spring 21 for kreturning the door which has one end attached to the extension 12 and the other fixed to the frame.

In Fig. 4 I have illustrated diagrammatically one form of circuit connections which I preferably employ. These circuit connections may be controlled by a. Switch mechanism of the type just described. 0bviously, however, various other forms of switch mechanism may be employed to produce the results which I obtain by my improved arrangement of circuit connections. As shown in Fig. 4, the heating coils l and 7 `are arranged in series with the line when the movable contact member 15 is in open sistance coil 7 develops a greater percentage y of heat than thecoil l and `consequently the greasev paint heater is operative with the coils yin series.` Ordinarily the current which ioW's When'the coils are in series is not sutlicient to cause the coil 1 to generate enough heat to heat a curling iron. To -meet this condition, I provide a shunt including a conductor 23 around the grease paint heater and locate the switch mechanism in this 'shunt so that it will make and break the same. Thus when the curling iron is inserted in the .heating chamber, the shunt around the4 grease paint heater or coil 7 is y jcloscd and this coil is short circuited, permit/ting a greater amount of current to iiow through the coil 1 of the curling iron heater to provide therequisite amount of heat.

By my'iniproved circuit connectionsand my improved construction, I lhave provided an electric heating device wherein the heat is distributed inthe required proportion tol the object to bel heated. By short circuiting the grease paint coil, I am able to lconcentrate the heat in'v the curling iron coil and thus more quickly bring the curling iron to the desired temperature. At the same time that the curling iron coil is supplied with the maximum current, the heat developed by this-coil is radiated upward to thegrease paint heater which is located. above the same so that the grease. .paint pan is kept at the' proper temperature. When'itvis .desired to remove the curling iron, the original circuit connections are restored and the grease pain heater ism-again thrown in` seriesvith the f curling iron heater, the etfect being to cut ldown the amount of energy absorbed-by the curling' ironf'coil and supply energy to, the grease .paint coil. It at any timeitis de-y siredto throw both of the coils out fof circuit all that it .is necessary to Ado is toopen the line switch. lBy my improved arrangement of circuit connections, I am able to increase the ellicicncv ot the heatinf.r coils and to distributctlie heat more neariy in v.the proportion i'equirgd. Further, by my 1mproved construction of switch mechanism, I

specific form shown for purposes of illustration, but Wish rather to include Within the scope of this application all of those forms of my invention which fall Within. its spirit.

What I claim as new and desire to secure by Letters Patent is In an electric heating device, a plu- Arality of heating coils/f normally simultaneously in circuit and means actuated by the placement. of the object to be heated Within the heating zone for short circuiting l one lof said coils.

2. In an electric heating device, av plurality of heating coils of different resistance` norm..lly simultaneously in circuit, and means yactuated by the `placementof the object to lbe heated within the heating zone forV short circuiting certain Yof said coils.

3. In an electric lheating device, a plurality of heating coils ofditferent resistance simultaneously incireuit, and means actuated by an object to be heated for short circuiting certain of said, coils having a higher resistance.

4. In an electric heating device, a plurality of coils simultaneously in circuit, one

of said coils `b 'ng arranged to form a chamber, a door for said chamber, and means for` short circutting one of said coils upon move-` ment of said door.

v5. In an' electric heating device, a plu rality of heating coils in series, one of said coils being arranged to form a chamber, a door for said chamber, and means actuated by 1said door for shortcircuiting one of said co1 s.

6. In an electric heating device, a pluralityof heating coils of di lferent resistance in series, one of said coils'being arranged to form a chamber, a door for said chamber,

and meanscontrolledby movement ofsaid door for short circuiting the coil of higher resistance.

7. In an electric heating device, a pluralityof heating coilsof different resistance yarranged inseries, one of said coils forming a chamber, a door for said chamber, `and a plurality of resilient contacts bridged upon movement of said door to short circuit one of said coils. y l l.

8. Inan electric heating device, a plurality ofheating coils of different resistance ladaptedto be simultaneously in circuit, one

of said coils being arranged to form a chamd ber, a door for said chamber, and means controlled by movement of said door for short cirouiting the coil of higher resistance, said means serving to hold said door normally closed.

- 9. vIn an electric heating device, a plurality of heating coils of diierent resistance arranged in series, one of said coils being arranged to receive an object to be heated, a plurality of objects heated thereby, a frame in which said coils are carried, and means chamber adapted to receive an object to be heated, a movable element mounted adjacent the open end of the chamber and normallyT biased to obstruct the entrance of the object to be heated, means carried by said ele-` ment for closing` a circuit, `said element being adapted to be moved the object as it is inserted whereby the circuit` is closed by chamber.

' l1'. An electric heater having a heating "chamber adapted to receive an object to be Correctonsn 'Letters PatentA No. 1,144,981.

[slaan] heated, a door pivoted adjacent one end of said chamber normally biased to obstruct the entrance of an object to be heat/ed, means carried by said door for completing an electric circuit, said door being adapted to be moved by the object as it is inserted whereby the circuit is closed by the insertion of the object into the heating chamber.

12. An electric heater having a heating chamber adapted to receive an object to be heated, a plurality of contacts mounted yadjacent one end of said chamber, a door pivoted adjacent the same end of the chamber', conducting means carried by said door adapted to engage said contacts, a spring for biasing said door to normally obstruct the entrance of an object' into the heating chamber, said door being adapted toV be moved by the object as it is inserted whereby the conducting means coperates with the contacts to complete an electric circuit by insertion ofthe object into ,the heating chamber.

In Witness whereof, I have hereunto sub-` scribed my name i'n the presence of two Wit- EDWIN N. LIGHTFOT.

Witnesses: lV. D. HADAWAY, Gaonon J. MALLoN.

'nesses the insertion of the object into the heatingl It is hereby certified that in Letters Patent No. 1,144,981, granted June 2.9, '1915, .i 4upon the application 'of EdWinN. Lightfoot, of New York, N. Y., for-an improve- -ment in Electric Heaters,v errors appear in the 'printed specification requiring correction as follows:A Page 1, line 81, forthe Word-studsf read lugs; page -line 53, {irst column, for theword pain read paint; and that the said Letters 'Patent ShQQld bev read with these corrections therein that'the same may conform to the record of the case in the Patent Oiiice y Signed and sealed this 27th day of July, A. D., 1915.

a. r. WHITEHEAD,

Acting Commissioner of Patents.

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