US857485A - Electric heater. - Google Patents

Description

PATENTED JUNE 18, 1907.

J. A. fiEARDoN. ELECTRIC HEATER. APPLICATION FILED FEB.ZB,1906.

[NVEJV-TOR 1 W1 T/VESSES:

A Tram/16 STATES PATENT OFFICE, T-IJAMES A. R ARDoN, or SEATTLE, WASHINGTON.

; ELECTRIC HEATER.

pave. 857.485.

Specification of Letters Patent.

Patented J une 18, 1907.

Application filed February 23.1906; Serial No. 303,492.

Electric Heater, of which the following is a Y specification.

This invention relates to electric heaters, and has for itsprincipal object to rovidea .IO device of simple construction whic may be conveniently used for the heating of small uantlties of water in basins ort e like, or

or other purposes where an electric current may be conveniently employed for heating purposes.

' A further object of the invention is to provide a resistance element carrier in the form of a helically grooved cylinder of porcelain or other non-conducting material, in which provision is made for the convenient placing of a double winding of wire of high resistance, a

' further object in this connection being to so construct a rooved cylinder that while acting to prevent s ort circuiting of the coil, it will,

2' 5 also, vshield the wire andprevent contact between the latter and the casing of the heater.

' A still further object of the invention is to provide an electric heater which -may be placed in any liquid containing vessel without interfering with the free circulation of water through the heater, no matter what the position of the latter may be. i

A still further ob'ect of the invention is to provide anelectric eater in which all of the 135 current conducting elements are held'from contactwith any portionof the exterior of the casing, so that there will be no danger of shock in case 'a-portion of the body is immersedin the water while the heater is in op- 4 ing of'the heater may be grasped without the slightest danger of grounding any portion of v ing a portion of the current through the body the current throu h the body.

With these an other objects in view, as

will more fully hereinafter a pear, the invention consists in certaln nove features of con-I struction and arrangement of parts, here- "inafter fully described, illustrated in the accompanying drawings, and particularly pointed-out in the appended claims, it being understood that various changes ,in the form, proportions, size and minor details of the -structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

plan view of the cylinder. view of a portion of the cylinder showing the eration, and any portion of the handle or cas- In the accom anying draw1ngs2-Fi re 1 1s a sectional e evat on of an e ectric eater constructed 1n accordance with the invention. Fig. 2 is a detail elevation, on an enlarged scale, of the cylinder forcan'ying the Fig. 3 is a sectional Fig. 4 is a detail reslstance element.

manner in which the big t of the resistance wire is held. Fig. 5 is a sectional View of the handle on an enlarged scale. Fi 6 is a detail view of a portion of the switci.

Similar numerals of reference are employed to indicate corresponding arts throughout the several figures of the raw 7o S 11 carrying out the invention, a cylinder 10 is formed of porcelain or similar material,

and the periphery of this cylinder is provided with a pair of, helical ribs 11 that extend from end to endof the cylinder and define grooves in which the wire 12 is wound. At a point near one end of the cylinder one of the ribs is cut away and provided with a notch 15 whichreceives the bent portion of the wire, and the latter is 'thence wound double through the grooves, each single turn being 'separated from the others by the ribs until,

at the op osite end of the cylinder, the ribs are revidbd with openings 16 for the passage of t e ends of the wire. The ribs are prefer-' ably so spaced as to permit the ready winding of the wires within the grooves, and are of such height that no portion of the wire will be exposed, the wires being-thus kept from 0 either mechanical or electrical contact with the casing 18 in which the cylinder is laced. All portions of the electrical con uctors are thoroughly insulated and held from con- 4 tact with the casing,so that the latter may 5 be grasped in the hand without danger of shock, and there can be no danger of groundin case the hand is immersed inthe water while the heater is in operatio'nl The casing 18 is annular in cross section, comprising an outer tube 18 and an inner tubev 19. This casing is hermetically sealed at both ends, and if necessary the, air may be exhausted therefrom. Theouter end of the casing is preferably rounded, although its shape at this point is notof material: importance. From the endot the caslngproect a number of lugs 20 whichserve to support the lower end of the casing slight y no to .the handle.

above the bottolnof the vessel in case the heater is placed in a vertical position. This will permit of the circulation of the water through theinner tube 19, no matter what the position of the heater may be.

Secured to one end-of the casing is a pair of tubes 21, containing wires 22 which are connected to the .ends of the high resistance wire, and said wires extend through the tubes The handle is made in two sections, 23 and 24, the section 23 being provided with contacts 25 and 26 to which the ends of the wire 22 are connected. This portion of the handle has an end socket in which the outerportion of the handle may be screwed, and the outer portion of the handle is provided with contacts 27 and 28, that are arranged to engage with the contacts 25 and p 26, respectively.

' The outer section of the handle is connected to current conducting wires 29 and 30, which may be connected at the opposite end to a suitable plug for insertion in a lamp socket or the like, and in this outer portion of the handle is a rotary push button switch 31 that is'connectcd between the wire 29 and the contact 27,-while the wire 30 is extended directly to the contact 2-8. The rotary push button switch is of thattype in which alternate depressions will make and break the circuit, one depression closing the circuit in .order to place the heater in operation, and

the current continuing to flow through the high resistance wire until thebutton is again depressed, thistime for the purpose of breaking the circuit.

The outer section. of the handle may be removed at' pleasure, and when so removed there are no live wire connectlonswhlch might prove dangerous in the event of careless handling, the apparatus being constructed with a view of preventing accidental shocks, while in the hands of careless or inexperienced persons.

The device may be conveniently employed for the heating of small quantities of water in basins or similar vessels, or may be used for heating purposes generally if desired.

1. 1n anelectric heater, a hollow cylindrical cylinder having on its periphery -a double rib extending helically from end to end of the cylinder, one of the ribs being providedwith' an under-cut recess at a point near one end of the cylinder to receive the bight of the wire and prevent its accidental displacement, and.

both of the ribs having openings near the opposite end of the cylinder, and a double resistance wire, the bight of which extends through theundcr-cut recess, the wire be-- ing wound in the grooves between the ribs and the terminals of the wire passing through said 0 I enings.

2. n an electric heater, acylinder of in sulating material having w re receiving the cylinder is incloscd, a handle carryingsaid casing, and current conducting wires ex:

tending through the handle and connected to the terminals of the resistance wire. I

3. In an electric heater, a grooved cylinder of insulating material, a resistance wire wound within. the grooves and having its two terminals at the same end of the cylinder, a metallic casing inclosing the cylinder and including a pair of spaced tubes, the inner of which is open at both ends to permit the passage of li uid, a bifurcated handle secured to the cylinr er, and current conductors extend ing through the handle and connected to the terminals of the resistance wire. 4. In an electric heater, a cylindrical support formed of insulating material .and provided with peri heral grooves, a resistance wire wound wit llll the grooves and having both of its terminals at the same end of the cylin.der,an annular casing inclosing said support, the grooves being of sufficient depth to prevent contact between the wiresand the outer portion of the casing, a handle member, a pair of tubes connecting the handle 'mem her to the casing, current conductors extend.- ing through the handle member and the tubes and connected to the terminals of the resistance wire, and a switch located in the handle.

5. In an electric heater, an annular casing 10d arranged to form a central liquid passage, project-ions arranged atone end of the casing to permit free circulation of the li uid when the casing is placed on end, a hand e secured to the opposite end of the casing, and a high 105 cured .to one end 0 the casing, a high resist I10 ance conductor arranged within and held from contact with all portions of the casing, current conductors extending through the handle and connected to the high resistance conductor, and lugs or projections disposed at that end of the casing opposite the handle to permit the free circulation ofliquid when the heater is placed on end.

7. In an electric heater, the combination with aca'sing, of a high resistanceiconductor arranged within and held fromeleetrical contact with the casing, a two part handle com prising, inner and outer detachable sections, contact members carried by the sections and arranged to engage with each other to com 12 lete a circuit, a controlling switch carried y the outer sect onof the handle, the outer section together with the switch and current conductors being detachable from the inner section.

- 8. In an electric-heater, a casing-Q11" high tion of the handle, togetherwith the switch resistance conductor arranged within and. and the outer, current conductors" being deinsulated from said casing, a sectional handle tachable fronlthe inner section of the handle. 1 for saidcasing, said sections having plug and socket connection, and. the inner section having current conductors that are connected to the high resistance conductors, aswitch earried by the outer section of the handle, and current.. conductors leading through such outer section, the switch being connected to I :one of said current conductors the outer sec- In testimony that I claim the foregoing as 15 my own, I have hereto affixeci'my signature in the presence of two witnesses.

' JAMES A. -REARDON.-

Witnesses:

J. Ross COLHOUN. C. E. DOYLE.

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