US 3303324 A
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Description (OCR text may contain errors)
L. APPLEMAN Feb. 7, 1967 HEAT ING UNIT Filed Aug. 21, 1964 1.: Ill! 41] I I LFIL Lrlu L-IIL Lrl-l I.
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i764 F/GJ United States Patent 3,303,324 HEATING UNIT Leon Appleman, 225 E. 57th St., New York, NY. 10021 Filed Aug. 21, 1964, Ser. No. 391,231 8 Claims. (Cl. 219-345) This invention relates to a heating unit and relates more particularly to a heater having a quartz plate element as a source of radiation.
A primary object of this invention is the provision of an improved heating unit which is sturdy and durable in construction, reliable and eflicient in operation and relatively simple and inexpensive to manufacture, assemble, utilize, and maintain.
Another object of this invention is the provision of a heating unit wherein a quartz plate element has a coiled resistance wire pressed against its rear surface by a backing member in relatively tight abutting relationship to thereby increase the effective quantity of radiant heat produced by the unit.
A further object of the instant invention is to provide a heating unit of the type described wherein the backing plate has a continuous groove means defined therein in facing relationship to the quartz plate and the coiled resistance wire is disposed in the groove means in compressed relationship.
A still further object of the instant invention is the provision of such a heating unit wherein the groove means defined in the backing member has a lesser depth than the diameter of the coils of the resistance Wire so that when the quartz plate and the backing member are pressed together the coil is compressed to tightly fit within the groove means.
Still another object of this invention is to provide a heating unit wherein the backing member 'has a highly reflective element such as an aluminum foil sheet or the like in abutting relationship with its rear surface to further increase the thermal output of the unit.
Yet another object of this invention is to provide a heating unit of the type described wherein all of the elements are maintained in relatively tight abutting relationship by a frame means.
Other and further objects reside in the combination of elements, arrangement of parts and features of construction.
Still other objects will in part be obvious and in part be pointed out as the description of the invention proceeds and as shown in the accompanying drawing wherein:
FIGURE 1 is a bottom plan view of a heating unit in accordance with the instant invention, with parts broken away for illustrative clarity, and with certain hidden parts being shown in dotted lines;
FIGURE 2 is a longitudinal cross-sectional view taken substantially on line 22 of FIGURE 1;
FIGURE 3 is an enlarged transverse cross-sectional view taken substantially on line 33 of FIGURE 1;
FIGURE 4 is an enlarged fragmentary view showing the relationship between the quartz plate element, the backing member and the resistance coil before the former two elements are pressed together in abutting relationship; and
FIGURE 5 is an enlarged fragmentary View similar to FIGURE 4 but showing the relationship of the elements after the quartz plate element and the backing member have been pressed together.
Similar reference characters refer to similar parts throughout the several views of the drawing.
Referring now to the drawing in general, the heating unit of the instant invention is designated generally by the reference numeral 10. The unit is comprised basically of a quartz plate element 12, a backing member 3,303,324 Patented Feb. 7, 1967 "ice 14, a coiled resistance wire 16, a highly reflective element 18, and a frame means 20.
The quartz plate element 12 is conventional in construction and may be of any desired size or shape depending upon the particular use to which the heating unit 10 is to be put.
The backing member 14 is comprised of a highly heat resistant asbestos compound such as produced by Johns Manville Company and has a continuous groove means 22 defined therein in facing relationship to the quartz plate element 12.
The coiled resistance wire 16 is formed of any conventional material such as the well known nickelchromium alloy Nichrome and each coil has a diameter substantially equal to or slightly less than the width of the groove means 22 and larger than the depth of the groove means 22 as will be best seen in FIGURE 4. Thus, when the quartz plate element 12 and the backing member 14 are pressed toward each other into abutting relationship the coiled resistance wire will be compressed in relatively tight fit within the groove means 22 as shown at 16 in FIGURE 5. It will be noted that a large portion of each coil, when compressed, is in actual contact with the quartz plate element 12.
The highly reflective element 18 may comprise any conventional material such as a sheet of aluminum foil or the like and is placed on the rear surface of the backing member 14 in abutting relationship therewith.
The frame means 20 may take any form depending upon the particular utility of the heating unit 10 and as shown in the drawing comprises an outer frame member 24 open at its bottom 26 and including portions 28 to which are secured by screw means or the like 30 flange members 32 affixed to an inner frame member 34 having an inwardly directed peripheral flange 36 to support the quartz plate element 12. Angle members 38 are secured in any conventional manner such as by spot welding or the like interiorly of the inner frame member 34 in such a manner as to maintain the quartz plate element 12, the backing member 14 and the highly reflective element 18 in relatively tight abutting relationship.
The ends 40 of the resistance wire 16 are conductively connected to a source of electrical power (not shown) in any conventional manner such as by providing a plug member receivable in an ordinary outlet box for A.C. current.
It is to be understood that the heating unit 10 of the instant invention may be used in many different environments. For example, it may be incorporated into a home cooking unit such as a broiler or the like for cooking food or into an industrial heater for baking or drying of coatings or finishes applied to various articles. The par. ticular arrangement of parts set forth hereinbefore wherein the coiled resistance wire is compressed within the groove means of thebacking member and in substantial cont-act with the rear surface of the quartz plate element produces an unexpected increase in output requiring less time and electrical power to heat selected articles than heating units known heretofore.
It will now be seen that there is herein provided an improved heating unit which satisfies all the objectives of the instant invention and others, including many advantages of great practical utility and commercial importance.
Since many embodiments may be made of the instant inventive concept and since many modification may be made of the embodiments hereinbef-ore shown and described, it is to be understood that all matter herein is to be interpreted merely as illustrative, and not in a limiting sense.
1. A heater unit comprising a quartz plate element, a backing member having two surfaces, one of said surfaces being in abutting relationship with said quartz plate element, continuous groove means defined in said one surface of said backing member in facing relationship to said quartz plate element, a coiled resistance wire having two ends disposed in said groove means closely pressed against said quartz plate element, the depth of said groove means being less than the diameter of the :coils of said resistance wire and of a configuration providing space for limited transverse expansion of said coil whereby said coils are compressed by said quartz plate element, and a source of electrical power conductively connected to said ends of said resistance wire.
2. A heater unit in accordance with claim 1 wherein the Width of said groove means is substantially equal to said diameter of said coils of said resistance wire.
3. A heater unit in accordance with claim 1 wherein said backing member is comprised of a highly heat resistant asbestos compound.
4. A heater unit in accordance with claim 1 wherein said resistance wire is comprised of a nickel-chromium alloy.
5. A heater unit in accordance with claim 1 further comprising a highly reflective element in abutting relationship with the other of said surfaces of said backing member. 7
6. A heater unit in accordance with claim 5 wherein said highly reflective element comprises an aluminum foil sheet.
7. A heater unit in accordance with claim 1 further comprising a frame means maintaining said quartz plate element and said backing member in relatively tight abutting relationship.
8. A heater unit in accordance with claim 5 further comprising a frame means maintaining said quartz plate element, said backing member and said highly reflective element in relatively tight abutting relationship.
References Cited by the Examiner UNITED STATES PATENTS 2,481,554 9/1949 Winstead 338252 X 3,059,087 10/1962 Perlman 219405 X 3,155,814 11/1964 Appleman et al. 219345 X FOREIGN PATENTS 266,199 2/ 1927 Great Britain.
RICHARD M. WOOD, Primary Examiner.
C. L. ALBRITTON, Assistant Examiner.