US812609A

US812609A - Electric heater for liquids.

Info

Publication number: US812609A
Application number: US21721904A
Authority: US
Inventors: George E Stevens
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1904-07-19
Filing date: 1904-07-19
Publication date: 1906-02-13
Anticipated expiration: 1923-02-13

Description

PATENTED PEB. 13, 1906.

G. E. STEVENS. ELECTRIC HEATER FOR LIQUIDS.

APPLICATION FILED JULY 19,1904.

A Mk1 Inventor, sorge E Stevens Witnesses:

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UNITED STATES.

PATE@ GEORGE E. STEVENS, OE LYNN, MASSACHUSETTS, ASSleNORPTelGENERAL ELECTRIC COMPANY, A CORPORATION OE NEWl YORK.

ELECTRIC HEATER FOR LIQUIDS.

Specification of Letters Patent.

Patented Feb. 13, 190e. f

Application ned July 19, 1904. sain No. 217,21a`

To all whom, it may concern:

.Be it known that I, GEORGE E. STEVENS, a citizen of the United States, residing at Lynn, county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Electric Heaters for Liquids, of which the following is a specification.

The present invention relates to electric heaters of the type em loyed in heating and boiling liquids for coo ng and similar purposes; and it has for its object to produce a device which is simple and compact in structure and efficient in operation. To this end I preferably employ a resistance unit of compact structure which may be heated to a high temperature without deterioration and incase the same in an envelop of metal, which is adapted to project into the liquid to be heated. The unit is preferably closely fitted Within the envelop, so as to be in good heatconductive relation thereto, and the leads are brought out through one end of the envelop, the lead from the distant end referably extending through the center of t e unit. It is obvious that a unit of this type may be used in various relations, either independent of or in fixed relation to a liquid-containing recep- In the present application I have illustrated one embodiment of the invention consisting of a simple water-heater in which the unit-containing envelo is formed integral with the receptacle an the circuit-leads extend out through the handle.

The nature of my invention will be better understood by reference to the following descrip tion, taken in connection with the accompanying drawings, and its scope will be particularly pointed out in the appended clanns.

In said drawings, Figure 1 1s aside eleta'4 tion of said water-heater, embod 1 the features of my invention. `Fig.2i acentral section through the same. Fig. 3 is a bottom view illustrating particularly the means for holding the parts in place. Fig. 4 is a fragmentary view similar to Fig. 2 of the modification; and Fig.' 5- is a detail view of said modification, illustrating the means for clam ping the handle in position.

Referring in detail to the drawings, 10 designates the receptacle for the liquid, which may be of an preferred form and is here shown as a cy indrical cup provided-with a over a tube 15 of flange 11, which constitutes a supportingbase. Located centrallywithin this cup and extending through an opening in its bottom 55A is the heating member 12, which is preferably '.f tubular in shape, with its upper end closed f ""'j and its lower end firmly secured to the bot` i tom of the receptacle, so as to lprovide awateri tight joint. The lower end of this VInernbe 12 is left open, so that the heating unit 13 in@ be readily slipped into and out of plaee'.. unit ma beef any preferred form; preferably consists of a helicall eonduotiil d, ribbon 14, wound. on edge withl its con 1U; 5 tions insulated from each otherand'f th terior of the heating member 12,*by'a`1w1yT able insulation, but preferably a ,refract insulationfor instance, one composed kaolin and silicate of soda. Inl the preser W stance this coil of conducting-ribbon is slippe orcelain or otherbspirnilr insulating materia provided with a flange at its lower end, upon which thej IlibbQQ firmly seated. In assembling, a suitablejlea 7 5 17 is connected to the lower end of the ance-conductor before the same is passed over@y f tube 15, said lead having first been assedthrough an opening 18 in the lower en of the tube communieatlng with a longitudinall .86 groove 19, which extends throughout the f length of the tube. The conductor may then be slipped into place upon the tube 15, and the connection between the lead 17 .and l the conductor 14 will pass down through the '8'5 groove 19 and when in nal position will be located within the winding 13 in a rotectedfposition. The other terminal 20 1s passed E i throu h the center of the tube 15 and through K a smaIl opening 21 in a conducting-disk 2.2 atl 99 I the upper end Ofthe Winding, suitable elecey n trical connections being made between saidy lead 20 and the disk 22 and said disk and the upper end of the helical winding 14. With this construction the unit 13 may be readily 95 slipped into position in the heating member 12 or drawn out for the purpose of re air.

The unit 13 is preferably heldv in p ace by means of a cap 23, which is removably fitted into the lower end of the tubular member 12. 'lhis cap is rovided with an opening at one side, throug which extends a hollow stem 24, which passes laterally through the flange 11 and then upward and outward, sogas to form,

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a handle for the rece"tacl, the outer end of the stem being provi ed with a gri i 25. The hollow stem 24 serves as a duct ier the reistanee-leads 17 and 20, which are suitably insulated from each other and the interior of the tube. The parts are iirmly held in lace by means of an apertured plate 26, whicli engages at one end with an inlurned portion 27 on the flange 11 and at its opposite end is held in place b a screw 28, which passes through the shel of the stem 24. It is obvious that the parts may be held in place by other means. In Figs. 4 and 5 I have shown a modification in which the base 11a of the receptacle consists of a casting into which the shell 10u of the receptacle is seated and through which the lower end of the stem 24a is Securely held by reason of the reater thickness of the metal at the point t ough which the stem asses. The u per end of the stem 24*l is he d in lace by a s iding member 30, which is rovidbd with oppositely-extendin win s w 'ch pass under the clips 31, secure to t e shell of the receptacle. The wings of the sliding member 3() `tre provided witb projecting portions which engage coperating de ressions in the clips 31 and can be remove therefrom only by springing said wings out of enga ement therewith.

It will be apparent rom the above that at any time the stem 24 or^24 and the cap 23A may be removed for the purpose of wi thdrawing the resistance unit 13. It will also be apparent that the heatin(y member 12, which is practically surrounded by the liquid to be eated, is in good heat-conductive relation to the 4resistance-winding 14 and that said member by reason of its smooth exterior permits the receptacle to be readily cleaned.

It is obvious that the heating member 12 might also project into the liquid from any of the other walls ofthe receptacle than the bottom and that the same might be greatly varied in shape Without departing from the spirit and scope of the present invention; but it is desirable that the same should be of such shape that the heating unit may be withdrawn for the purpose of repair. It is also desirable that the shape of the heating unit be similar to that of the interior of the heating member 12 in order that the resistanceeonductor may be brought into good conductive relation to said member. In the use of the device the level of the liquid should normally be above the upper end of the heating member 12 in order to prevent the unit from becomin unduly heated, thereby failing to utilize fu ly its energy.

Many uses ofthe construction of the heating unit and inclosing envelop herein disclosed will be suggested to those skilled in the art as falling wit `n the spirit and scope of the present invention. Many alterations and modieations may also be made in said structure without departing from the spirit and scope of the invention I therefore do not wish to be limited to the specifiquses or to the specific construction herein disclosed.

That I claim as new, and desire to secure by Letters Patent of the United Statesis,

1. An electric heater comprising a receptacle, a hollow heating member extending upward from the bottom of the receptacle and open to the exterior of the receptacle at its lower end, an electric heating unit adapted to be inserted in and withdrawn from said member and having its resistance el'ement in intimate thermal relation to the walls of said member, a lead extending from the upper end of the unit down throuvh its center, and a second lead secured to the lower end of said unit.

2. An electric heater comprisin tacle adapted to contain a liquid toe heated, a closed rentrant metallic tube extending upward from the bottom of said receptacle, a resistance unit mounted in said tube in good heat-conductive relation to the walls thereof, the resistance being provided with a joint within the tube below the normal liquid level to prevent burning out.

3. In an electric heater, a hollow `heating member adapted to extend into the liquid to be heated, an ,edgewise wound reslstance unit located therein in heat-conductive relation to the walls thereof, comprisin@` a c entral insulating-tube provided with a ange at one end upon which said resistance-winding is seated, a conducting-disk connected tothe opposite end of said wmdin and resting upon the opposite end of said tu e, a lead secured to said disk and extending through said tube, and a second lead secured to the outer end of the resistance unit.

4. An electric heater comprising a receptacle, a hollow tubular member within the recep tacle extending upward through its bottom a recep- IOO and closed at its upper end, an electric heating unit therein, comprising a heating-.coil in close heat-conductive relation therewith, and means for removably holding said unit within said member.

5. An electric heater comprisin T a receptacle, a hollow tubular member within the receptacle extending upward through its bottom and closed at its upper end, an electric heating unit therein, comprising a coil corresponding in shape with said tubular member and in close heat-conductive relation therewith means for rem v,vably holding said unit within said member, said means comprising a cap, a duct engaging therewith and ccmmumcating with the interior thereof, and a retaining member e 0raging the base of said receptacle and secure to said duct.

6. An electric heater comprising a rece tacle, a hollow tubular member within t e same extending upward through its bottom and closed at its up er end., a removable electric heating unit t ercin, a cap for closing IIC 1 trie heating unit t the lower end of said member, a duct com? munioating with the interior of said 'cap and extending outward to form a handle for said receptacle, and means for securing said cap and sai base of the receptacle, a cap or closing the lower end of said member, a duet engaging erein, a lanfge forming the said-"raap and eommunieating with the interior thereof and extending outward to form 15 a handle, and means for d duet in removable receptacle comrisin `enga ing said ange uct.

In witness whereof I have hereunto sald hand this 18th day ofJul 1904.

' Witnesses:

securing said cap relation with sald a retaining member base and secured to set my GEOR E E. STEVENS.

DUGALD MoK. MoKILLoP,

oHN A. MoMANUs.