US2456202A - Heating unit - Google Patents

Description

Dec. 14, 1948. E

HEATING UNIT Filed NOV. 26, 1945 Fig 1 INVENTOR. BY

ATTORNEY Patented Dec. 14, 1948 UNITE!) STATES PATENT- OFFICE" HEATING om Hoard Lee, Houston, Tex

Application November 26, 1945, Serial No. 630,784

This invention relates to a heating unit.

An object of the invention is to provide a heatin; unit of such construction that the heat will be retained within the unit with minimum loss of heat.

Another object of the invention is to provide a heating unit which has been specially designed for the efficient use of electricity as a source of heat and is particularly useful for cooking purposes.

The unit may be designed for slow heating, as is desirable in certain kinds of cooking, or it may be enclosed on top and around the sides with quick heating material for quick heating when that is desired. The unit may also be enclosed on the bottom and sides by a casing of heat resisting material either with, or Without, insulating material between the casing and the heating unit proper.

Another object of the invention is to provide a heating unit of the character described in which the resistance coil, or heating element, is mounted in a novel manner.

With the above and other objects in view the invention has particular relation to certain novel features of construction, arrangement of parts and use, an example of which is given in this specification and illustrated in the accompanying drawings, wherein:

Figure l is a plan view with the quick heating Jacket removed,

Figure 2 is a plan view with the quick heating jacket installed,

Figur 3 is an enlarged cross-sectional view, and,

Figure 4 is a perspective view of a type of heating element anchorage employed.

Referring now more particularly to the drawings wherein like numerals of reference designate the same parts in each of the figures, the numeral I designates the body of the heating unit which, as shown, is circular in form, but which may be made of any selected shape. It is formed of metal of poor thermal conductivity and is preferably, although not necessarily, mounted on an insulating pad 2, which may be formed of asbestos.

The body I is provided in its upper surface with a groove, 3 which is preferably, though not necessarily, spiral and which extends approximately throughout the area thereof, and which, in its preferred form, has a vertical outer side and an undercut or dove tailed innerside as more clearly shown in Figure 3. This groove is provided to contain a resistance, or heating, element 4, which is 1 Claim. (Cl. 219-37) 2 shown in Figure 1 as being formed of a suitable electrical conductor coil.

This resistance element is supported in place byanchors 5 preferably formed of porcelain and having the same shape as the cross-sectional contour of thegroove 3, so as to fit therein.

It will be noted that one end of the groove extends to the margin of the body I, as shown in Figure 1, and before installing the jacket, or casing, as hereinafter referred to the required number ofanchors 5 may be slipped over the resistance coil 4 and said coil may then be inserted endwise into thegroove 3 and the anchors suscessively fitted into and moved along, the groove until the resistance element 4 is completely installed in place and the anchors may then be adjusted the required distance apart, as shown in Figure 1 so as to support the resistanceelement in place. The ends of said element may'then be secured in place byterminals 6, 6 which form connections for electrical conductors.

If desired the resistance element may be surrounded through the length of the,groove 3, by suitable insulating material as 8, as indicated in Figure 1, which is flush with the upper surface of the body I. The heat from the resistance element 4 will thereby be quickly carried to the cooking surface. The heat will also be distributed through the body I and when said body becomes thoroughly heated the current can be lowered and the heat stored up in the body I. Metal or poor thermal conductivity can thus be utilized with a minimum loss of heat, resulting in a saving of electrical current.

The body I and insulating pad 2 maybe enclosed by a casing I, as best shown in Figure 3. This casing is formed of heat resisting metal and is effective to prevent dissipation, and loss, 01' heat from the body I. l

If desired the body I may be enclosed on top with a cap likejacket 9 of suitable metal. This jacket is not indispensable but it is preferable. However for slow heating purposes the jacket may be dispensed with.

This application is a continuation in part of my co-pending application for Heating element filed November 3, 1944, under Serial Number 561,740.

The drawings and description are illustrative merely while the broad principle of the invention will be defined by the appended claim.

What I claim is:

A heating unit comprising, a body formed of metal of poor thermal conductivity and having a sinuous groove in the upper face thereof which extends approximately throughout the area of said face, anchors formed of insulating material spaced apart along said groove, a resistor extending approximately from end to end of the groove and maintained in place by saidanchors in spaced relation to the walls of the groove, a jacket into which the body is fitted, said jacket in-cIuding a continuous flanged plate lying adjacent the resistor, a continuous insulating coating, or covering, on the side of the unit opposite the grooved side, a casing of heat resisting metal enclosing the margins of the body and enclosing theside of the body, opposite the groove, throughout its entire area and in contact with said insulating coating or covering throughout the area. thereof, the free with the flange of the plate.

HOARD LEE- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,322,670 Dagenais Nov. 25, 1919 1,436,034 Hamlin Nov. 21, 1922 1,644,255 Kercher et-al Octmi, 1927 2,026,797 Pierson Jan. 7, 1936 FOREIGN PATENTS Number Country Date 650,590 France Sept, 24, 1928

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