US1288044A - Electric immersion-heater. - Google Patents

Description

F. KUHN & J. A. HAND.

ELECTRIC lMMERSION HEATER.

APPLICATION man FEB-'21, 191s.

Patented Dec. 17, 1918.

MW MA-WW JAY A. HAND, both citizens States of America,

- ers, of which the following reference being bad therein .to the acconiv designed foru'se in the immersion heater which is of comparatively tion the'heating lindrical casing of small dimensions, which similar tubular- STATES "PATENT ()F FRANK Karin Ann .iAY

,A. HAND, or nnrnorr, MICHIGAN, assIeNoRs-To'AMnRIcAu ELECTRICAL HEATER COMPANY, OF DETRQIT, MICHIGAN, A CORPORATION OF,

7 mronrenn;

- Specification of Letters Patent.

ELECTRIC rlvnvrnnsron-nnnrnn.

Patented Dec, 17, 1918.

Application filed February 21, 1918. Serial No. 18,401.

To, all who'm'it may concern Be it knownthat we, FRANK K HN- and of the United both residing at Detroit, in the county ofWayne and State of Michi gan, have invented certain new and useful Improvements in Electric Immersion-Heatpanyingdrawings. 1 he inventionrelates to electric heaters eating of liquids by'immersion thereinto, and the,;j invention comprises the-novel constructionja's hereinafter set forth. i

,In the drawings:

Figure l is a perspective-,view cifthe heater;

Fig. 2- is a central longitudinal section therethrough; v FFig. is a cross-section on line 33 igf i is an elevation of a portion of the heating unit showing the manner of winding the same; and

Fig. 5 is a perspecti i ejview illustrating the manner ofassembly. e

For many uses it is desirable 'to have an high electrical resistance andis also very compactso that it-may be inserted into a small vessel. With our improved. construe element is placed 1n 2. oy-

in turn is connected with a shank for the terminal conductors having a plug socket at its outer end. The heat ng unit is formed of a series of flatthin insulator cores, preferably of mica, on which is wound a continuous resistor, and the several sections are insulated from each other by interposed strips of mica. or otherinsulator. In detail, and'as shown in Flgs. 4 and 5,

are formed with apertures B B for the as sage of clamping screws and around w ich is spirally wound a continuous res1sto r C. The resistor passes across from one strip to the adjacent iine alternately at opposite ends so-as to permit ofassembly in zigzag form, as shown in Fig. 5. Mica strips D of greater width are then inserted between the adjacent resistor-wound strips so as to separate and insulate the same, and corresponding insulatingstrips are placed outside the outer resistor-wound sections,

and screws F. Theseplates' and screws hold the,

is a specification,

conducting contact. f may be imparted to etc., are the mica core strips, which all being held nil/proper relative position by the alined apertures, B therein. E are" heat-absorbing and distributing clamping plates arranged upon opposite sidesof the series of sections secured to each-other by the clamping series'from' displacement and also place sufiicient pressure thereon to insure good heat the reslstor by increasingor-diminishing the number of wound sections, and on account of the good heat conduction the-inner sections will not rise 4 in temperature above the safe limit.

The heating unit formed as described is inserted in a tubular outer casing G, closed at one end and at its opposite end engageable With a shanktube H through which the terminal ends of the resistor pass. These Any desired resistanceterminal portions are insulated. by surrounding insulator tubes I and at their outer ends are connected with enlarged terminal con- 'tacts J. These terminal contacts are secured The construction as described may be used by inserting the casing into the liquid to be' heated and engaging a plug, such as M, with the socket in ated in the resistor passes rapidly outward through the heat-absorbing and distributing members E, whiclnbeing in heat conducting relation to. the outer casing, --will quickly transfer the heat tothe liquid.

What we claim as our invention is:

- 1. An electric immersion heater, comprising a heating unit havin I a series of superposed flat sections wound with a continuous resistor with interposed flat insulation, heatabsorbing and distributing members clamped upon opposite sides of theseries, having fiat faces for engaging the same; and forming in connection therewith complementary por- Thus in the casing L. The heat genertions ofa circular cro'ss' sectiom-and a tubu- "nalends of the resistor pass, a

.lar casing in which said unit is inserted closed at its lower end and having terminal connections at its upper end.

2. An electric immersion heater, comprising a fiat elongated heating unit, heat-absorbing and distributing members onopposite sidesof said heating unit and segmental 1n cross-section to form complementary por tions of a circular crosssect1o-n, a .tubular housing closed at its lower end and recei vtubular shank of "mg said heating unit, a smaller diameter through which the termiterminal socket having an end portion for fitting said tubular'shank, and means for sealing the joints between said tubular shank, the tubular casing and said terminal socket.

3. An electric lmmersion heater, comprisadapted for engagement 'in-g a fiat"elongated heating unit, segmental ends of the resistor, and a housing telescopically engaging said tubular shank, and inclosing said insulator block and terminalcontacts.

FRANK KUHN; JAY A. HAND.

with the terminal In testimony whereof Weaflix our signa-' 'tures.

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