US2131484A

US2131484A - Heater

Info

Publication number: US2131484A
Application number: US31984A
Authority: US
Inventors: Ringwald Clarence
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-07-18
Filing date: 1935-07-18
Publication date: 1938-09-27
Anticipated expiration: 1955-09-27

Description

Sept. 27, 1938. c. RINGWALD 2,131,434

HEATER Filed July 18, 1955 4 Sheets-Sheet l N C70/P2266 -affa/ S2W@ M Sept. 27, 1938. c. RINGWALD 2,131,434

HEATER Filed July 18, 1935 4 Sheets-Sheet 2 Sept. 27, 1938.

HEATER Filed July 18, 1955 C. RINGWALD 4 Sheets-Sheet 3 Yam/2a Imf e ugr.

orngy C. RINGWALD HEATER Filed July 18, 1935 4 Sheets-Sheet 4 Sept. 27, 1938.

Patented. Sept-27, 1938 UNITED STATES PATENT OFFICE y The present invention relates to heating devices and has for its principal purpose the pro- 4 vision of an improved heater ofthe radiant type so constructed and arranged to be operated at l higher temperatures than heretofore possible,

thereby improving the eillciency andeifectiveness off the device. More specifically, it is an object of the present invention to provide a heater having a source of radiant heat together with a reflector of polished metal for concentrating the Aheat rays and ymeans for cooling the reector so as to prevent oxidation of the polished surface, thereby'prolonging the life of the reflector and permitting the use of somewhat higher temperatures at the heat source.

it further object of the present invention is the provision of means for blowing a blast of air over the back of the reflector to cool the same, and an additional object of the present invention is to conduct this blast of air over all parts of the reflector and, nally,'to direct the blast of air, now warmed by having 'been passed over the reflector, in the same general direction in which the reflector concentrates the radiant heat rays.

An additional object of the present invention is the provision of a compact unit of this type, embodying a source of radiant heat, a reflector therefor and means including a blower of the centrifugal type, preferably driven by a small electric motor, for directing a blast of air over the back of the reflector to cool the same.

A still further object of the present invention is the provision of a heater capable of throwing out radiant heat rays, which are very effective in heating, drying and similar operations, in connection with means which not only serves to keep the reector cool, but, at the same time, serves to warm a blast of air which is directed in the same direction as the radiant heat rays and therefore can be relied upon to keep the air moving about the object or person in the path of the radiant heat rays, thereby increasing the comfort of the subject and preventing the building up of too high temperatures under the effect of the radiant rays.

Still further, another object of the present lnvention lies in the provision of a heating device embodying a reector which is kept cool by the use of a blast of relatively cool air directed over the back of the reflector. In this way, the reflector is not subject to excessively rapid deterioration, as by oxidation, and, therefore, the eiliciency of the same in concentrating the rays of radiant heat is greatly improved and the life of4 the device appreciably lengthened.

As is well known, the radiation or the amount of heat rays emitted varies as the fourth power of the absolute temperature of the surface of the body radiating heat. If, therefore, means is provided making it possible to employ as a source of heat a body which can be brought to a higher temperature than formerly, a comparatively great increase in the amount of heat rays which can be created is attained, since the emissive power of `such body is thereby greatly increased.

These and other objects and advantages o! the present invention will be apparent to those skilled in the artafter a consideration of the following detailed description of the preferred structure. taken in conjunction with the accompanying drawings illustrating said structure.

In the drawings:-

Figure l is a front view of a heating device embodying the principles of the present invention;

Figure 2-is a vertical central section taken generally along the line 2-2 of Figure l;

Figure 3 is a side view of the heater shown in Figure 1;

Figure -4-'is a section, corresponding to Figure 2, taken through a modified structure also embodying the principles of the present invention;

Figure 5 is a central section, taken along the line 6 5 of Figure 6 and showing a third modied form of the present invention;

Figure 6 is a front view of the modification shown in Figure 5;

Figure 'l is a partial front view of a fourth form of the present invention;

Figure 8 is a rear view of the construction shown in Figure 7, being a section taken along the line 8 8 of Figure 9, showing the air ducts for conveying the blast of air into the air chamber at the back of the reflector; and

Figure 9 is a section taken approximately along the line 9--9 of Figure 8.

Referring now to the drawings, more particularly to Figures 1 to 3, the reference numeral I indicates the face plate or frame casting which constitutes the principal part of the front of the device, the frame casting including rounded marginal portions terminating in rearwardly directed flange sections 2. The face of the frame casting I is provided with a large aperture I disposed generally in the central portion thereof and preferably, although not necessarily, surrounded by a raised ornamental rib 4. The mainV opening 3 is disposed somewhat nearer the top of the frame casting I than at the bottom, which leaves sufficient space for two sets of air inlet openings t formed in the raised portion 1, in the bottom lower part of the frame casting I. An ornamental ridge 8 is formed around the edge of the face plate or frame casting I for decorative purposes, and adjacent the upper margin of the main central opening 3 are three air discharge passages III which will be referredto later.

A cylindrical parabolic reflector I5 is mounted over the opening 3 and has its outwardly facing surface highly polished. Preferably, although not necessarily, the reflector I5 is carried'by parts to be described later, but if separately attached to the frame I, it may be secured in place by screws I5 inserted through openings in the marginal portions of the reflector and threaded into holes formed in the face plate or frame casting I. The reflector I5 includes planar end portions I1 formed of ilat sheets andsecured to the refleeting portion proper of the reflector I5, as best indicated in Figure 3, by tabs I8 or the like carried at the marginal edges of the reflector and inserted through openings in the planar sections Il and clinched in place. Obviously, however, any other means could be used for securing the side or end portions of the reflector in place. Employing a cylindrical parabolic reflector permitsthe use of an elongated heating element which can be disposed in the focal line of the reflector as will be referred to later.

The side plates I1 carry insulating blocks 2|) which serve as supporting means for sockets 2| carried at the outer end of springs 22. The inner ends of the springs opposite the sockets 2| are secured in place by bolts 23, which also afford a convenient attaching means for leads 24. The sockets 2| are formed of conducting material, as are the springs 22, and are extended through openings 28 in the end plates I1 of the reflector. Mica discs 23 serve to keep the sockets 2| and the springs 22 out of contact with the side plates Il of the reector. The sockets 2| are formed, as best shown at 30, to receive an elongated resistance unit 3| which serves as a source of radiant heat when energized, and, as stated above, the element 3| is supported in or along the focal line of the reflector I5. The principal function of the latter, by virtue of its highly polished surface, is to reflect the heat rays striking the same outwardly through the main opening 3 in the frame casting I in substantially parallel lines.

It is not necessary, of course, that the spring supporting means 2|, 22 for the heating element 3| be carried upon the side portions of the reflector. If desired, the frame casting itself may carry the supporting spring brackets. However, the arrangement illustrated facilitates not only the assembly of the device in the first instance, but also the removal or replacement of the heater element 3|.

The reflector I5 is preferably formed of metal and highly polished, as suggested above, and lt is well understood that a reflector of this type is highly efilcient so long as the reecting surface does not tarnish or oxidize. However, where elements which are heated to incandescence, the reilectors in such constructions are relatively short lived parts because the high temperatures to which they are subjected by virtue of the close proximity of the incandescent heating unit act to corrode and tarnish such surfaces quite readily. According to the principles of the present invention, provision is made for passing a blast of cooling air over the back of the reflector, and this is especially effective in reducing the temperature of the reflector and therefore preventing tarnishing or corrosion thereof. Furthermore, cooling the reilector provides for the use of much higher temperatures than would otherwise be possible, producing greatly increased quantities of heat rays.

Moreover, the blast of air in passing over the back side of the reflector becomes heated by virtue of contact with the heated reflector and can be directed in the same direction as. the

radiant rays, thus doubling the usefulness of the device.

With this end in view, I provide a fin or supporting member 35 on the lower portion of the face plate or frame casting I, preferably, but not necessarily, integral therewith, and on this plate I support a blower casing 36 having a vaned rotor 31 mounted on the shaft 38 of and driven by an electric motor 40. The intake side of the casing 38 includes a plate 4I fastened by studs 42 or the like to the main body of the blower casing. From Figure 2 it will be noted that, according to the principles of the present invention, the rotor 31 is a turbine-type impeller which has a higher eiliciency and greater capacity for a given size than ordinary fans. This is an important advance in heaters and similar devices of this character, since space is more or less at a premium, especially where such heating devices are made portable.

The fan casing has a discharge outlet 43 which is secured to a wall 44 surrounding but spaced from the rear side of the reflector I5, as best shown in Figure 2. The wall 44 is curved about the reector I5 and may be separately fastened to the frame by screws or the like, or it may be attached to the side plates I1 by means similar to that described above in connection with the reflector I5, as by forming tabs 46 on the wall 44 and projecting them through openings in the side plates Il, and in this case the screws I6 can be omitted, the reflector I5 and wall 44 assembled together. From Figure 2 it will also be noted that the space between the back of the reflector I5 and the wall 44 forms an air chamber 41 receiving the blast of air from the fan 33, and that the openings III serve as outlets for the air blast, directing the same in the same general direction that the reflector I5 projects the heat rays. A cover or closure 48 is provided for protecting the mechanism and embraces the reflector and air chamber in the back thereof, as well as the motor and impeller, and fits against the rear edges of the reflector side plates I1.

A constriction 45 is formed in the wall 44 approximately directly above the heating element 3| by bringing the wall 44 somewhat closer to the reflector at this point. The purpose of this arrangement is to provide, in effect, a restriction at this point, first, to insure that the blast of air from the fan will be distributed laterally in a uniform manner and, secondly, to secure a somewhat greater cooling action, due to the somewhat increased velocity of the air at this point, along the reflector I5 directly adjacent the constriction 45 which is directly above the heating element 3| and therefore subjected to the greatest heat. By virtue of this construction, the air is well heated and the flow thereof is uniform over all points of the reflector and issues from the three openings I0 at about the same velocity.

Air is supplied to the intake of the fan 33 through the front inlet openings 6, and the blast of air directed into the air chamber by the discharge duct 43 sweeps over the back side of the reflector I5 and emerges from the openings I0 in the same general direction as the rays are reflected by the reflector Il. However, in sweeping over the back side of the reflector Il, substantial amounts of heat are absorbed by the air, and the heated air, being thus forced outwardly in the same general direction as the heat rays themselves are reflected, serves to maintain a circulation of warmed air in and around the zone of operation into which the radiant rays are also directed.

Any suitable control means for the heater 3i and fan 38 may be provided. but preferably they are controlled by separate switch means indicated by the reference numerals I and 5I. Preferably, although not necessarily, the motor l0 is mounted by suitable cushioning means l2, such as rubber, springs or the like, so that the unit will be substantially noiseless.

In operation, when the heater switch lll is turned on, current is directed through the heating element Il and the latter is thereby heated to incandescence. The radiation therefrom is coilected and reflected by the polished surface of the reflector Il and directed outwardly through the main opening 3 of the front plate or frame casting I in substantially straight line projection. So long as the reflecting surface of the reflector I5 remains in a highly polished condition, the efficiency of the reector remains quite high. However, no device of this character is absolutely perfect and, therefore, a. certain number of the heat rays are absorbed by the reflector, resulting in a rise in temperature. As is obvious, the higher the temperature of the heat source, the greater the number` of heat rays emitted, and therefore the greater the number of them that are absorbed by the reflector. Heretofore, the reflector served as a limit the temperature to which the heat source could be operated, and if operated beyond this linut, the reflector quickly oxidized and tarnished. When the reflector begins to oxidize and tarnish the highly polished metal reflecting surface is destroyed so that where before only a small percentage of the heat rays were absorbed, now a substantial portion of them are absorbed and only a small percentage reflected. This results in the quick destruction of the effectiveness of the reflector. According to the principles of my invention, by operating the blower 36, and I provide suitable connections between the fan switch 5i and the motor 40 so that when the switch is turned on the motor is energized to drive the fan or blower rotor I1, the resulting blast of air which is drawn into the fan or blower and directed over the back of the reflector serves not only to keep the reector cool, but, in addition, the air thus heated is directed outwardly through the openings I0 in the same general direction that the radiant heat rays are directed. Thus, the blast of air serves a double purpose, namely, keeping the temperature of the reflector down and thereby permitting the use of a higher temperature at the heat source, and second, utilizing the heat thus removed from the reflector in warming the blast of air which is directed in the same general direction as the radiant heat rays. This is especially advantageous in providing greater comfort, for the effect of the penetrating radiant heat rays is somewhat softened by the gentle blast of moving and warmed air. It is also to be noted that passing the blast of air on the back side of the reflector, where the material thereof is usually not highly polished and is therefore a good radiator, materially increases the efficiency of the device, so far as the moving blast of air being able to quickly absorb heat from the back of the reflector is concerned.

When used as a drier, for example, the effect of the warm moving air, directed in the same general direction as the radiant rays, is to prevent the radiant heat from causing the subject to become too hot during the later stages ofthe drying, and the use of a blower of the centrifugal type produces straight line movement of the air without any whirling or circular motion, whereby the effectiveness of the directed air in reaching the zone acted on by the radiant heat rays is increased.

Figure 4 shows a slightly different modication of my invention, differing from the form described above in that the frame casting or face plate, indicated by the reference numeral 60 in Figure 4, has the back wall 6I and the rotor housing 62A both formed integral therewith, whereas in Figure 2 the back wall M, forming in conjunction with the reflector I5 an air passageway or chamber, was preferably formed of sheet metal and mounted by screws or the like on the frame casting. In Figure 4 a reflector 83 of substantially the same material and formation as that described above is mounted by any suitable means in the central or main opening 04 in the front of the frame casting Bil desired. Directly above the main opening 64 in the frame casting 60 two or more air discharge openings 68 are provided, being arranged in a manner similar to the discharge openings I0 described above, and the air chamber or passageway S1 formed between the reflector 63 and the back wall 6I communicates with the openings 66 so that the blast of air from the blower 69, being directed upwardly in the direction of the arrows shown in Figure 4, serves to absorb heat from the back of the reflector to permit the use of a high temperature at the heating element 10.

The heating element 10 is carried in a pair of spring mounted sockets 1I extending, at least partially, through an opening 12 formed in the side walls Il of the reflector. 'I'he back wall 62 forms the major portion of the lower housing, a portion thereof adjacent the front face of the frame casting being formed by a curved metal plate 1l. As in the modification shown in Figures l to 3, switches are provided for separately controlling the blower 69 and the heating element 10. A cover or casing 15 may be disposed over the back wall 6I and the motor for driving the blower 69, if desired, and may be secured to the ange I6 formed on or carried by the front portion of the frame casting 60. However, the cover or casing 15 may be mounted in much the same manner as the cover 48 is mounted in Figure 2, and similarly the cover It shown in Figure 2 may be formed and mounted in a manner similar to the cover 15 shown in Figure 4.

It is to be noted that the back wall 6I of the frame casting 60, shown in Figure 4, is, like the back wall 44 described above, provided with a constriction 68 for the purpose of insuring a lateral distribution of the air from the blower 69, a somewhat greater cooling acttion for the reflector directly about the heating element 10, and a uniform velocity for the air issuing from the plurality of openings i6.

In Figures 5 and 6 I have shown another form of the present invention somewhat similar to that shown in Figure 4, in that the back wall, behind the reflector, and the blower housing are formed integral with the frame of the device. In the form shown in Figures 5 and 6, however, the front of the device is disposed in an inclined position. The frame casting is indicated by the reference numeral 80 in its entirety and includes a section 8| serving as a blower housing for blower 82 and a backv wall section 83. The front of the device is formed by a face plate 85 provided with suitable or desirable ornamental ridges 86 and a main central opening 81. At the upper and lower portions of the opening 81 are upper and

lower air outlets

88 and 88, four at each side being shown.

The reflector is indicated by reference numeral 9| and is of the same form and construction as described above, and is secured to the face plate 85 about the opening 81, being secured thereto in any desired manner. Likewise, the heat unit or element 93 is carried in spring mounted sockets 94, as has been described previously. Also the motor 95 which drives the fan or blower 82 is mounted on or carried by the face plate 85 and is mounted thereon by means of cushioning blocks 35a or the like. A switch 96 for the heater is provided and a separate switch 91 controls the motor 85 for the blower.

The rotor 82 of the blower discharges air upwardly against the lower portion of the reflector through an opening formed in the frame casting 80, a portion of the air passes outwardly through the lower openings 89 and the remainder is directed upwardly and passes around the major portion of the reflector 9|, finally emerging at the `upper outlets 88. The flow of the air is indicated by the arrows in Figure 5, and it will be observed that the air, after passing over and cooling the reflector 9| emerges from the two sets of

openings

88 and 89 in the same general direction that the reflector 9| directs the radiant heat rays striking its polished reflecting surface. Air is drawn in by the blower 82 through an inlet opening |0|.

This form of my invention may be mounted on a table or the like, and to this end feet |02 are provided. If desired, the back wall 83 of this iorm might also be provided wtih a constricting ridge to insure uniform distribution of the air blast.

In Figures 7, 8 and 9, I have shown another form of heating device which, while embodying the principles of the present invention, is so constructed and arranged that the reflector may be swung from a position directing the heat rays horizontally to a position directing them upwardly, the flrst position arranging the device for heating and the second position arranging the device for cooking.

The shield walls |50 and 5| move in telescoping relation with respect to the cylindrical walls of the shell |38, so that whatever the position oi the reflector may be, whether that shown in full lines in Figure 9 or that shown in dotted lines, the air from the blower |32 passes through the branch conduits |38 and |31 into both ends of the shell |38 and over the back of the reflector and out the discharge openings |53 and |54 in the same general direction that the reflector |45 directs the radiant heat rays emitted by the unit |43. In the position shown in full lines in Figure 9, the heat rays are directed horizontally, as is the air blast from the openings |53 and |54, but when the reflector unit is turned through 90 degrees to the position shown in dotted lines, both the air blast and the heat rays are directed upwardly. The end walls |41 of the rockable reflector unit are provided with openings |56 to receive the air blast from the branch conduits |38 and |31, and these openings are long enough to function in either position of the reflector. In the first position, the device may be used for cooking food, since by placing a suitable container on the upper bars |26, the upwardly directed heat may be used to cook food contained in the container. As best shown in Figure 8, the blower |32 is preferably driven by an electric motor |60, and, as in the previously described modifications, the heating unit and motor may be controlled by separate switches. However, in all of the modifications described above, one switch may be used for controlling both, or a master switch may be provided for controlling both the air blast and the heat units, with a separate switch for either or both of the units individually.

While I have shown and described above the preferred structure in which the principles of the present invention have been embodied, it is to be understood that my invention is not to be Il limited to the specific details shown and described above, but that. in fact, widely different means may be employed in the practice of the broader aspects of my invention.

What I claim, therefore, and desire to secure by Letters Patent is:-

1. A heating device comprising, in combination, a source of radiant heat, a polished reflector therefor curved about said source to concentrate the rays thereof, means serving as a wall disposed in spaced relation around the back of said reflector, and means for directing a flow of cooling air between said reflector and wall means and in contact with the back of said reflector to prevent oxidation of the polished surface thereof, a portion of said wall means approaching the back of the reector at certain points so as to serve as a restriction causing a uniform distribution of the airflow over the back of the reflector.

2. A heating device comprising, in combination, a source of radiant heat, a continuous polished reflector therefor, and means for directing a ow of air in contact with the back of the reflector to absorb the heat therefrom and to direct the same over the outer edge of the reilector to a point of utilization, there being air outlet openings disposed outwardly of the reflector to receive air directly from the back of the reector, said openings facing in a direction to discharge the air flow away from the reector.

3. A heating device comprising, in combination, a source of radiant heat, a polished reflector therefor, comprising a curved member having straight line parallel elements and being generally parabolic in section, said source of radiant heat comprising an elongated member disposed substantially in the axis of the curved reflector, a hood shaped similarly to said reflector and spaced rearwardly from the latter, and means for directing a flow of air between said reector and hood and discharging the same outwardly between the adjacent edges of the reflector and hood to remove at least a portion of the heat absorbed by said reector.

4. A heating device comprising, in combination, a casing having an opening therein, a curved reflector carried by said casing back of said opening and having a polished reflecting surface, a source of radiant heat carried by the casing adjacent said curved reecting surface, means carried by the casing rearwardly of said reflector and forming in connection with the back thereof a chamber, the casing having openings laterally outwardly and at one side of said reector and the opening back of which the reflector is carried, said last named openings communicating with said chamber, and a blower for forcing a blast of air through said chamber and out said openings.

5. A heater comprising, in combination, a face plate having an opening therein, a curved reilector disposed back of said opening and having a polished reflecting surface, a source of heat disposed within said reflector, an air opening formed in said face plate adjacent said first opening, a wall carried by said face plate curved about the reector and spaced therefrom to embrace said air opening and to form in conjunction with said reflector an air chamber, a blower for discharging air through said chamber and out said air opening for the purpose of absorbing heat from the back of said reflector, and a constriction formed in said wall adjacent said air opening to distribute said air laterally along the reflector.

6. A heater comprising, in combination, a frame casting having an opening therein, a source ation therewith an air chamber on the rear side of the reflector, a plurality of air openings formed in said frame casting spaced outwardly of said tlrst named opening therein and communicating with said chamber, and a blower for forcing air through said chamber and over the rear side of the reector and out said air openings, said air being discharged in the same general direction as but outwardly of the heat rays that are reflected out said ilrst opening by said reflector.

7. A heating device comprising, in combination, a frame casting having a main opening therein, spring-mounted sockets .disposed in insulated relation at each side of said opening, a reflector embracing said opening and having a polished refleeting surface, a resistance element serving as a source of heat disposed in said spring-mounted sockets adjacent said reflector, a shell carried by said frame casting spaced rearwardly from the back side of said reflector, air discharge openings formed in said frame casting adjacent said main opening and communicating with the space between said reector and said shell, a blower of the centrifugal type carried by said frame casting and having a discharge duct opening into the space between said reflector and said shell, means for driving said blower, and means adjacent the latter and on the opposite side of said main opening from said plurality of air discharge openings for supplying air to said blower.

8. A heating device comprising, in combination, a frame casting having a main opening formed therein, a reector secured to said frame casting around said opening, a source of heat disposed substantially at the focal point of said reflector, the latter serving to direct the heat rays from said source outwardly in substantially parallel directions, blower housing means formed integrally with said frame casting and including a portion curved about the rear side of said reflector but spaced therefrom to form an air chamber therebetween and the blower housing communicating with said chamber, means serving as air discharge openings communicating with said chamber at the side of said reflector opposite the discharge opening from said blower housing, and a blower of the centrifugal type disposed within said integral blower housing and serving to direct a blast of air over the back side of said reector to cool the same, said air discharge openings directing said blast of air in substantially the same direction as the heat rays are directed by said reflector.

9. A heating device comprising, in combination, a frame member having an opening therein, a reector disposed over said opening and comprising a right parabolic surface having parallel elements and planar ends, spring-mounted sockets carried by said ends in insulated relation and disposed in the focal line of said reflector, means serving as a source of radiant heat when energized disposed in said sockets, means carried by said frame member and embracing said reflector at the rear thereof in relatively closely spaced relation and forming in connection therewith an air passage along the back of the reflector, there being air discharge openings leading outwardly from said space, a blower housing connected with Said last named means centrally of the reflector,

and a blower mounted in said housing for directing a blast of air across the back of the reflector -to absorb heat therefrom, said air being discharged forwardly from said air discharge openings.

10.`A heating device comprising, in combination, a source of heat, a polished reflector therefor pivotally mounted for swinging movement into either of two positions, a stationary blower,

and conduit means leading from said blower to the reflector in either of its positions for directing a blast of air over the back of the reflector.

11. A heating device comprising, in combination, a frame member, a right parabolic reflector pivotally mounted therein for movement about an axis coincident with the focal line of said reflector. an elongated heating element mounted in stationary relation in said frame member and serving as a source of radiant heat disposed substantially along the focal line of said reflector, and means for directing a blast of air over said reflector to prevent the reflecting surface thereof from oxidizing under the high temperature of said heat source.

12. A heating device comprising, in combination, a supporting frame having two spaced outlets, a cylindrical parabolic reflector mounted for swinging movement from a position in front of one of said outlets to another position in front of the other outlet, a source of radiant heat disposed substantially in the focal line of said reflector, means swingable with said reflector for closing either of said outlets when the reflector is positioned in front of the other outlet, means cooperating therewith forming an air chamber on the rear side of said reflector, means serving as air discharge openings for said chamber, and a blower adapted to direct a blast of air through said chamber and out said air discharge openings for the purpose oi' cooling said reflector.

13. A heating device comprising, in combination, a supporting frame having a central openlng therein, a cylindrical parabolic reflector disposed over said opening, means carried by said frame rearwardly of said reflector and cooperating in conjunction therewith to form an air chamber, air discharge passageways in said frame communicating with said chamber and providing for the discharge of air therefrom, a blower of the centrifugal type carried by said frame with its axis parallel with respect to the plane of the frame and the focal axis of said reflector, a source of radiant heat disposed in said reflector, and means including a motor having its axis of rotation in alignment with said blower axis and connected with the latter to discharge a blast of air through said chamber on the rear side of said reflector to absorb heat from the latter.

14. A heater comprising, in combination, a face plate having an opening therein, a curved reflector disposed back of said opening and having a polished reflecting surface, a source of heat disposed within said reflector, an air opening formed in spaced relation in said face plate relative to said first opening, a wall carried by said face plate curved about the reflector and spaced therefrom to embrace said air opening and to form in conjunction with said reflector an air chamber, and a blower for discharging air through said chamber and out said air opening for the purpose of absorbing heat from the back of said reflector.

15. A heating device comprising, in combination, means serving as a frame member having a generally disposed main opening therein, springmounted sockets disposed in insulated relation at each side of said opening, a reflector embracing said opening and having a polished reflecting surface, and a resistance element serving as a source of heat disposed in said spring-mounted sockets adjacent said reflector.

16. A heating device comprising, incombination, means serving as a frame member having a main opening therein, spring-mounted sockets disposed in insulated relation at each side of said opening, a reflector embracing said opening and having a polished reflecting surface, a resistance element serving as a source of heat disposed in said spring-mounted sockets adjacent said reflector, a shell carried by said frame member spaced rearwardly from the back side of said reflector, air discharge openings formed in said frame member adjacent said main opening and communicating with the space between said reflector and said shell, and a blower carried by said frame member and having a discharge duct opening into the space between said reflector and said shell.

i7. A heating device comprising, in combination, a frame member having a main opening formed therein, a reflector secured to said frame member around said opening, a source of heat disposed in operative relation in said reflector, blower housing means formed integrally with said frame member and including a portion curved about the rear side of said reflector but spaced therefrom to form an air chamber therebetween and the blower housing communicating with said chamber, means serving as air discharge openings communicating with said chamber, and a blower disposed within said integral blower housing and serving to direct a blast of air over the back side of' said reflector to cool the same.

18. A heating device comprising, in combination, a frame member, a right parabolic reflector pivotally mounted therein for movement about an axis coincident with the focal line of said reflector, and an elongated heating element mounted in stationary relation in said frame member and serving as a source of radiant heat ,disposed substantially along the focal line of said reflector.

19. A heating device comprising, in combination, a supporting frame having two spaced outlets, a reflector mounted for swinging movement from a position in front of one of said outlets to another position in front of the other outlet, a source of radiant heat disposed in said reflector. means swingable with said reflector for closing either of said outlets when the reflector is positioned in front of the other outlet, stationary means cooperating with the reflector in forming an air chamber on the rear side of said`reflector, said chamber having an air discharge opening facing in the same direction as said reflector, and a stationary blower adapted to direct the blast of air through said chamber and out said air discharge opening for the purpose of cooling said reflector.

20. A heating device comprising, in combination, a casing, a curved polished reflector supported in the upper portion thereof and facing laterally outwardly, a source of radiant heat mounted adjacent said reflecting surface, said casing having an opening through which the heat rays, reflected by said reflector, may pass and other openings outside said reflector, a hood carried by the casing and surrounding the back of said reflector, and means in the lower portion of said casing and communicating with the space lil between the hood and reflector for directing a 'u blast oi' air therebetween and out said other open ings so as to cool the reflecton 21. A heating device comprising, in combinan tion, a source of radiant heat, an elongated polished reector therefor curved about said source to concentrate the rays thereof and having generally parallel elements, means serving as a wall disposed in spaced relation around the back of said reflector, and means disposed at a point i0 intermediate the ends of said elongated reflector for directing fz flow of cooling air between said'. reM fleetor and wall means and in Contact with, the back. ef the reflector to prevent oxidation of the polished surface thereof, a portion of said wali means extending lengthwise of said reflector and, 5