US1817027A - Therapeutic lamp unit - Google Patents

Description

' \lg 4, 193`1- F. A. ANDERSON 1,817,027

THERAPEUTIC LAMP UNIT Filed Oct. 1l, 1926 Patented Aug. 4, 1,931

UNITED STATES FRITZ A. ANDERSON, OF MILTON, WISCONSIN, kASSIGNOR TO THE BURDICK CORPORA- TION, OF MILTON, WISCONSIN, A CORPORATION F DELAWARE THERAPEUTIC LAMP UNIT Application led October'll, 1926. Serial No. 140,840.

My invention rela-tes to therapeutic lamps. It relates more particularly r4to an improved light and heat generating unitA for use in therapeutic lamps wherein the production of red and infra-red rays are of primaryv concern `although, of course, it may be app ied to ot er lamps. y

An object of my invention is to 'provide an improved radiant energy generating unit il for use in therapeutic lamps.

n Another object is to provide a more eiiicient ray-generating unit. n

Another object is to provide a unit wherel in the heat generated by the passage of eleclb, tric current therethrough is applied to thel outer or effective ray-generating portion thereof while the inner support is effectively heat-insulated.

Another' object is to provide akunit whereo in the ray-generating and radiating element may be readily replaced if it becomes worn out or damaged. n

Another object is to provide an improved r method of making such units. o Other objects and advantages will appear as the description proceeds.

In the accompanying drawings, Fig. 1 is a sectional view of a lamp embodying my invention, the generating unit 3") being shown in elevation;

:5 t@ Mating unit ha a source ai? simetra Fig. 2 is a sectional elevation 0f the radiant energy generating unit at onestage of its production;

Fig. 3 is a side elevation of the combustible form used in making my improved generating unit; and

Fig. 4 is a view similar to Fig. 2, but showing the completed generating unit.

ceptacle housing 7, an electric screw plug receptacle 8 mounted in housing 7 a handle 9 attached to the housing, and a radiant enf ergy generating unit l0 carried by the screw .plug receptacle. The handle, housing', screw plug receptacle and reiiector may be of any suitable construction which will conveniently serva the purl-pose nl conne' the en current The therapeutic lamp comprises generally a parabolic reflector 6 carried on aV plug rei' 'egcfed A ses pastries, essaier- ,leaamseafgy seeming and will effectively reflect the rays emitted thereby.

My new and improved generating unit is made in a novel manner.

spirally grooved or luted form 11, of paper or other combustible material, is placed "on, a hollow core 1.2,.of lava or other suitable insulating material, and an electrical resistance element 13, preferably in the form of a wire, is wound in the spiral groove of the form. This use of the fluted form 11 to support the wire, eliminates the necessity of providing a fluted core for this purpose and permits the use of a core having a smoothv outer surface. The hollow core with its superimposed form and resistance element is then mounted on an insulated plug 14 and secured-thereto by fastening means 15. A

vend of the resistance element is secured to theupper end of metal post 16, .A and the lower end of the resistance element is secured by means of screw l18 to a threaded metal ferrule 19, which forms the outer electrical contact of the generating unit. The

resistance element is then covered with a layer of silicon carbide or similar refractory material. This refractory material is in a finely divided state and is mixed with a suitable binder and moistened sufficiently to form a plastic. mass which may be readily applied as a covering for the resistance element.

After the electrical resistance has been provided withI the covering 20 of silicon car bide or other energy radiating material, a metallic cap 21 isslipped over the upper end o f postk 16 and'secured inplace, in any appropriatel manner, such as a nutorfby 'swaging the upper end of the post over the cap. At this stage the assembled unit i's'fsuba fengperamrev qfi betweenI 150g to eihcit and the silicon Eflndecon- (ifi material, is thoroughly dried. The element is then subjected to a curing temperature between 1000O and 2000O Fahrenheit which burns away the combustible form and thoroughly cures and hardens the covering for the resistance element. The completed unit thus formed is shown in section in Fig. et.

Instead of assembling and curing the rayemitting element while its supporting form is mounted on the permanent core, such rayemitting element may be separately assembled and cured and later slipped over the permanent core and secured thereon.

Itis to be noted that my improved process produces a generating unit wherein the resistance` element is almost entirely embedded in the energy radiating material, the uncovered part of the resistance element being separated from the core by a heat-insulating air space, which results from the destruction of the paper form. This feature results in the maximum amount of the heat generated by the resistance elementbeing utilized in the production of radiant energy and a minimum loss of heat through the core. This feature also aids in eliminating unnecessary and undesirable heating of the plum It is to be further noted that the rayemitting element is a separate and distinct part of my generating unit and may be readily removed and replaced should it become worn out or otherwise useless.

Having thus illustrated and described an embodiment of my invention, what I claim and desire to secure by United States Letters Patent is as follows:

l. That method of producing a radiant energy generating unit for therapeutic lamps which comprises providing a perishable form, winding a resistance element thereon, embedding said resistance element in non-conducting material, and then destroying said form.

2. That method of forming a radiant energy generating unit for therapeutic lamps which includes winding a resistance `element on a perishable form, covering said resistance element with insulating material in a plastic condition, and simultaneously curing said material and destroying said form, said cured material forming a support for said resistance element.

3. The method of making radiant energy generating units which includes mounting a combustible form on a heat resistant core, winding an electrical resistance element on said form, covering said resistance element with a lastic non-conducting material, drying said plastic material, and thereafter destroying said form.

4. A radiant energy generating unit comprising a heat resisting core, a resistance element surrounding the core and spaced therefrom, a. covering of insulating material embedding the resistance element, and an air space between the resistance element and the core.

5. A radiant energy generating unit for therapeutic lamps comprising a hollow conical heat resisting core, a helical resistance element surrounding said core, a silicon carbide covering for said resistance element, said covering supporting said element and an air space separating said covering and said resistance element from said core.

6.. A radiant energy generating unit comprising a base, a core thereon, a hollow radiating member over the core and spaced therefrom and an electrical heating coil embedded in the inner walls of said hollow radiating member.

7. In a radiant energy generating unit, a base, a core supported thereon, a hollow radiating member over and supported on the core at one end and spaced therefrom and an electrical heating coil embedded in the inner wall of said member in spaced relation to the core.

8. A radiant energy generating unit comprising a plug, an inert heat resisting core and a ray emitting member surrounding the core and spaced therefrom, the ray emitting member including a covering of insulating material and a resistance element embedded therein, and being readily replaceable independently of the core.

In witness whereof I `hereunto subscribe my name this 16 day of September, 1926.

FRITZ A. ANDERSON.

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