US 2541218 A
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J- w a J u N. B. DOERR BOTTLE HEATER Feb. 13; 1951 Filed Feb. 14, 1947 Patented Feb. 13, 1951 UNITED STATES PATENT OFFICE BOTTLE HEATER Norman B. Doerr, Los Angelica-Calif.
Application February 14, 1947, Serial Nof728f609 1 Claim.
' The invention relates to a bottle heater and more particularly to a heater which is adapted to heat a nursing bottle without the use of water, and wherein the heater is an electrical heater which can be operated on a low voltage such as six volts so that it can be operated b the cigar lighter socket in an automobile.
In co-pending application S. N. 713'368,.f11'ed November :30, 1946., for Baby Supply Cabinet, I have disclosed and claimed .a cabinet which comprises a combined refrigerator, storage cabinet, and heater wherein the heater is similar to that described above. The present case is directed to the heater itself and more particularly to improvements in the heater disclosed in the co-pending case.
An object of the invention is to provide a bottle heater requiring no Water and suitable for operation by a low voltage source such as a cigar lighter socket in an automobile.
A further object of the invention is to simplify the manufacture of such heater and to increase the heating eificiency.
For further details of the invention, reference may be made to the drawings wherein Fig. 1 is a top plan view of the bottle heater according to the present invention.
Fig. 2 is a vertical sectional view on line 2-2 of Fig. 1 looking in the direction of the arrows.
. In Figs. 1 and 2 the bottle is shown in dotdash lines.
Fig. 3 is a sectional View on line 33 of Fig. 2 looking in the direction of the arrows.
Referring in detail to the drawings, the bottle heater I comprises a metal can 2 which is cylindrical and as long as the major length of the bottle 3 whereby the neck of the bottle protrudes enough so that the bottle can be grasped to remove it from the can 2. It is not possible to grasp the sides of the bottle when it is in the can 2 because the can 2 is only slightly larger than the bottle, in order to efiiciently heat the bottle by the can 2, by radiation and conduction, without the use of water in the can 2. The can 2 is heated by an electrical heater 4 having a base 5 of rigid insulating material such as an asbestos composition known as Transits. The base 5 is a disk of the same diameter as the can 2. It is common to wet Transite when tooling it to shape and it smolders when it is heated. To prevent this, on top of the base 5 is arranged a sheet 6 of mica and on top of sheet 6 is a heater wire 1 suitable for connection to a six-volt supply such as a cigar lighter socket of an automobile, Wire l isfarranged in a plane along the top 01 the sulator as well as an electrical insulator.
base5 and it extends for part of 'a circle as indicated at 8 and 9 and then re-enters in a smaller circle as indica ed at [0. The wire 1 and sheet 8 are held in position on base 5 by U-shaped rivets like ll which, in fact, may be small cotter plus. The wire I is embraced by the 'bight l2 of each cotter pin and the legs 13 of each cotter pin "extend through aligned apertures I l and 15 under the wire land through the mica sheet 6 and "the base 5. The ends of the rivets are bent over "the bottom of base 5 as indicated at 16. The rivets like H are spaced throughout the length of the wire '1, others being similarly indicated at "It, "I 8, 19 and "elsewhere.
The ends of the heater wire I have terminals 2|, 22 which extend through the base 5 and mica sheet 6 as indicated at 23. The heater 4 thus described in a complete unit and it is held in operative relation to the bottom 24 of the cam 2 by means of a bolt 25 which passes through a central aperture 26 in the bottom 24 and through a central aperture in an upper mica sheet 21 and through the center of the sheet 6 and base 5. The mica sheet 21 extends over the heater wire I at the top of heater 4 and prevents bottom 24 from short circuiting the heater wire 1. The base 5 and sheets 6 and 21 are disks of the same diameter as can 2.
The heater wire I with its upper mica sheet 21 is pressed or clamped against the can bottom 24 by the bolt 25 which has a nut 2-8 below the base 5. The heater wire I and its outer sheets 6 and 21 are thus pressed or clamped between base 5 and the can bottom. The heater wire 1 is thus in a position to efficiently heat the bottom 24 of the can, the side wall of the can being heated by conduction from the heated bottom 24. Radiation of heat in a downward direction from the wire I is reduced as the base 5 is a heat in- A further advantage of this arrangement is that it simplifies the manufacture of the device for the reason that the heater unit with its base 5; sheet 6, heater wire I and terminals 2| and 22' can be made up in one unit which is readily assembled on the bottom 24 by placing the upper mica sheet 27 on the heater wire 1 and by passing the bolt 25 through the bottom 24 and the base 5, and clamping it in position with the nut 28. This is done at a time when the can 2 is outside of the outer casing 30. Then the inner end 3| of the electrical cord 32 is passed inwardly through the hole 33 at the lower end of the side of easing 30 and out the top of casing 36 to a position where the 3! can be connected to the terminals- 2| and 22. Then insulation such as glass wool 34 is packed around the side of the can 2 and around the side and under the heater 4 and the can thus covered is pushed into the casing 39, as shown in Fig. 2.
Casing 36 is cylindrical and may be made of plastic or other suitable material. Casing 30 at its upper end has a series of lugs, four being shown and one of them indicated at 35. The top of can 2 has a circular flange 36 which fits inside the casing wall 31, and flange 36 is held on the lugs 35 by screws such as 38. The can 2 and its heater 4 form a unit which is suspended in the casing 30. The glass wool 34 is compressible and the lugs 35 do not materially interfere with inserting the can 2 and its associated parts and the glass wool 34 into position in the casing 30.
The casing 30 is preferably an integral one piece member and it may have integral feet as indicated at 39.
The cord 32 has a plug 40 which may be plugged into the cigar lighter of a car.
Various modifications may be made in the invention without departing from the spirit of the following claim.
A bottle heater comprising a one piece outer casing of plastic material having an integral closed bottom and open at its top, said top having a side wall having a plurality of spaced inwardly projecting lugs within the end of said wall, a one piece metal can smaller than the area enclosed by said lugs, said can having an outer end having a flange fitting inside of said wall on said lugs, screws having heads within the outer end of said casing wall for securing said flange to said lugs, said can having a bottom wall, an electric heating element secured to the outside of said bottom wall, said can and heater being insertable as a unit into said outer casing through the open top of said casing, a packing of insulating material between said casing and both said can and heater, and an electrical connection extending through said casing to said heater.
NORMAN B. DOERR.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 939,605 Levy et a1 Nov. 9, 1909 1,394,954 Van Aller Oct. 25, 1921 1,404,317 Pieper et a1 Jan. 24, 1922 1,483,837 Scott Feb. 12, 1924 1,565,539 Woodson Dec. 15, 1925 1,574,581 Kay Feb. 23, 1926 1,623,209 Schuster Apr. 5, 1927 1,860,302 Thomas May 24, 1932 2,277,605 Palitzsch Mar. 24, 1942- 2,431,582 Page Nov. 25, 1947 FOREIGN PATENTS Number Country Date 486,318 Great Britain June 2, 1938