US1671394A - Electric heater - Google Patents

Description

Mayzs, 1928. Y '1,71,394

E. E. ANDERSON ELECTRIC HEATER Filed March 2. 1925 '/*TURNEY Patented May 29, 1928.

.UNITED STATES EGENE E. ANDERSON, 0F KANSAS CITY, MISSOURI.

ELECTRIC HEATER.

Application filed March 2, 1925. Serial No. 12,738.

heating element was wound around a spool.

If the spool was arranged horizontally only half of the effective part of the heating element was presented to the reflector. Consequently, only fifty per cent of the heat generated was reflected heat.

If the spool was arranged so that its axis was concentric'with the axis of the reflector some of the resistance wire would bel closer to the reflector than the rest of the resistance Wire. In other Words, some of the resistance wire would be in focus with the reflector, some inside the focal point and some Aoutside the focal point, therefore there would be no uniformity of efficiency throughout the heat-ing element, it being borne in mind that in order to obtain the best'results all of the resistance wire should be, as nearl as possible, in perfect focus with the re ector.

My invention contemplates two important departures from known types of heaters. First. according to my invention all of the effective part of the resistance wire is presented to some part of the reflector; and second, a convex surface is extended transversely of the axis of the reflector and adjacent the focus thereof, and resistance wire is distributed over such surface, whereby I am enabled to obtain a high degree of efficiency from the heating element, actual tests proving that with the same amount of resistance wire and the same wattage a device constructed in accordance with my invention gives increased heat efficiency over known types, or devices, andv that the reflector does not appreciably heat even when the device has been run over a long period. Y

' Other features 'of the invention will be apparent as the details of construction of the invention are better understood, reference being had to the following description in connection with the accompanying drawings, in which` Fig. 1 is a perspective view of a heater constructed in tion.

Fig. 2 is a horizontal, sectional view through the reflector, the heating element being shown in elevation.

Fig. 3 is a perspective View of the hea-tinfr element, and

ig. 4. is a sectional view through the heating element.

The reflector 1 may consist of any suitable material. It is preferably metal with a polished surface and it is parabolic in form. The heating element is shown as consisting of a. core 2, the exterior of the core 2 being elongated and convexed, that is, the surface of the exterior' is curved longitudinally and transversely so thatthe middle portion 3 of the core is bulged with respect to the end portions. The core 2 is half-round, or substantially so, and it is preferably hollow resembling a miniature trough. The curvature of the core 2, both longitudinally and transversely, is adapted to provide a convex surface facing the concave surface 4 of the reflector 1. The core 2 is supported by the reflector through the medium of two bars 5 accordance with my invenand 6 secured to the ends 7 and 8 of the core 2 and to the rini of the reflector 1, there being insulations 9 and 10 between the rim and the members 5 and 6.

The resistance wire is in the form of a coil as indicated at 11. The coil of wire is wound back and forth transversely over the convex face of the core 2 in a series of parallel sections, the several4 sections being con-- tinuous parts of the wire, the wire between each section beinglooped over the projections 12 on the flat face of the core 2, this being accomplishedby forming the loop portions 18 so that they rest against the edges 14 and 15. The ends of the wire indicated 'at 16 and 17 pass through openings 18 and 19 in the reflector 1, the openings having insulations 2() and 21, and the ends of the wire, 16 and 17 being fastened to the cord 22 in an appropriate manner. For convenience I may utilize a cap 23 to cover the openings and connections and the reflector 1 may be supported in a suitable standard or bracket 24.

It will be seen from the foregoing that all of the effective part of the resistance wire will be presented to the reflector l, that a portion of the wire will be distributed over a convex surface facing the concave re- Hector and extending transversely of the lio What l claim and desire to secure by' Letters-Patent is 1 An electric heater, comprisingr a reflector, a heating element in spaced relation with the reflector, comprising an elongated core half-round in cross section and having a convex inner face curved outwardly from the ends toward the center and faced to- Ward the reflector, and resistance Wire on the curved portion of the core.

2. An electric heater, comprising a reflector, a heating element in spaced relation with the reflector, comprising an elongated core half-round in cross section and having a convex inner face curved outwardly from the ends toward the center and faced toward the reflector, and resistance Wire on the curved portion of the core, the resistance Wire running crosswise of the core.

3. An electric heater comprising a. reflector', a heating clement comprising a core extending transversely of the axis of' the re- Hector, a resistance wire on the side of the core facing the reflector, and supporting means connected with said core exteriorly of the field of projection of rays from' the heating element tothe reflector.

4. An electric heater comprising a reflector, a heating element comprising a core extending transversely of the reflector and resistance Wire Woundon tlieAside only of the core facing the refiector,and means connected with the core outside of the winding field for supporting the heating clement in functional relation to the reflector.

In testimony whereof I affix my signature.

EUGENE E. ANDERSON.

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