US1705300A - Therapeutic lamp - Google Patents

Description

March 12, 1929. R. H. MAXSON THERAPEUTIC LAMP Filed July 25. 1927 jnrenf or Patented Mar. 12, 1929.

UNITED STATES PATENT OFFICE.

ROLLAND H. MAXSON, OF MILTON, WISCONSIN, ASSIGNOR TO THE BUBDICK COB/- PORATION, OF MILTON, WISCONSIN, A CORPORATION OF DELAWARE.

THERAPEUTIC LAMP.

Application filed July 25, 1927. Serial No. 208,170.

My invention relates to therapeutic lamps.

It will be explained as embodied in a relatively small portable lamp, such as is ordinarily used for more or less local treatments in a physicians otlice, laboratory or at a patients home, although, of course, it is applicable to larger sizes for more general application. The portable or smaller size. such as that chosen to illustrate the features of the invention, may be more or less permanently mounted on any desired and appropriate support.

One of the objects of my invention is to provide an improved therapeutic lamp.

Another object is to provide an improved double-walled reflector for a therapeutic radiant energy generator.

Another object is to provide a well ventilated reflector.

Another object is to provide a relatively deep reflector with a comparatively flat refleeting surface.

Another object is to provide a lamp reflector-casing wherein the reflector can be removed without disturbing any other part of the structure.

Another object is to provide a therapeutic lamp in which a ventilated casing is employed for surrounding the major part of the reflector proper, the base portions of the radiant energy generating unit and electrical connecting members therefore so that during manipulation the operator Will not; touch the hot reflector walls nor disturb the sup:

port and electrical connections of the generating unit.

A further object is to provide a therapeutic lamp which is so constructed as to readily facilitate the removal of any element thereof for replacement without the use of special tools.

-A further object is to provide in a theras pcutic lamp a reflector having a reinforcing otl'set portion at its periphery which also performs the additional function of serving as a positioning and holding element for an outer casing.

Another object is to provide a reflector of pleasing appearance. simple and rugged construction. and etl'ective in use.

Other objects and advantages will hereinat'tcr appear.

An embodiment of the invention is illustratcd in the accompanying drawing, where- Fig. 1 is a side elevation, partly in section, of the assembled lamp, and

Fig. 2 is a sectional view on line 22 of Fig. 1.

The lamp comprises. in general, an outer shell or casing A supporting an electrical screw plug receptacle It for receiving a radiant energy generating unit t. and :1 relatircly tiat dish shaped rellector I) held with in the casing A.

Casing A is substantially parabolic in contour and has a rearwardly extending some what cup shaped depressed portion 1 about its axis. This cup shaped extension has a Hat rear wall 2 provided with a central opening t through which the base of re ccptacle 15 projects.

The means for holding receptacle ll fixed in the position shown in Fig. 1 includes four metal rods or bolts 5 having reduced portimis (l at their inner ends which extend through four equally spaced apart openings in a metal plate 7. Metal spacer sleeves 8 are disposed over portions 6 of rods 5 so as to space plate 7 a predetermined distance from wall 2. Rods 5 are threaded at their rear ends and a pair of nuts 9 disposed upon each of the threaded ends to securely anchor plate 7 thereto.

Receptacl B has a pair of outwardly Plc jet-ting perforated lugs or ears 10 for r ceiving screws 11 which thread into holes in plate 7, and thus rigidly support base 1% with respei-t to casing A.

That portion 12 of base l3 which supports electrical terminals 13 and extends through opening 4 in wall 2, is covered by a cap 14. (ap 14 has skirt 15' through which the threaded and reduced ends of rods 5 project and which is clamped in place against nuts .1 by nuts 15 threaded upon the rear ends of the rods. Cap '14 has an annular lining 16 of fibre or similar insulating material to prevent contact between the terminal wires of conductor cord 17 and the walls of the metal cap. A tubular threaded nipple 18 securely attached to cap 14 serves as a conduit through which the conductor cord is lead to the receptacle and as a support whereby the lamp may be attached to a suitable handle or bracket.

Reflector D is of the shallow type so as to afford radiation of energy from unit C over a relatively large area at short range. The reflector is preferably constructed of light,

highly-polished metal. such as aluminum. Its outer'end is flanged outwardly and then forwardly so as to provide an annular shoulder 20 against which the. outer rim of the shell or casing can be tightly drawn and a substantially cylindrical shallow rim 21 projecting beyond the reflector. In order to strengthen the rim of the reflector, eliminate a sharp edge and improve its appearance, the margin of the reflector is rolled outwardly into a head 22. The rear of the reflector is provided with an axial opening through which the base of the generating element may be inserted into the receptacle. This opening is surrounded by a rearwardly projecting flange 23 which may fit rather snugly about the base of the generating element. Around the margin of this opening in the reflector are a set of holes for re ceiving the outer ends of bolts 5 \\'llr):-t nuts 24 serve to draw and anchor the reflector and its outer shell together. Thus the rods or bolts 5 each cooperates with the reflector, receptacle, outer shell and rear cap to hold the same together in a unit adapted to receive a radiantenergy generating element.

In order that casing A may be kept relatively cool while in use, ventilating apertures E26 and 2? are provided through its side walls adjacent to and parallel with rim 3 and rcarwardly extending portion 1, respectively.

The radiant energy generator may be of any appropriate type but; I prefer to use and have illustrated the construction set forth in my co-pending application, Serial No. 193,221, tiled May 21, 1917. In general, this element comprises an insulating base 30 carrying an outer screw plug shell 31 and center contact 32 for engaging the outer screw and inner contacts, respectively, of receptacle B. The base also carries a resistor 33 embedded in a rigid supporting and heat and light emitting envelope composed of *arborundum and a suitable binder. This resistor is connected to contacts 331 and 32 so that when the element is screwed into the reflector receptacle it is in circuit.

\Vhen the lamp is in service, it is supported on a. handle by the operator or at tached to some fixture or on a suitable standard. The reflector directs the rays of radiant energy and the outer shell or casing sup ports and protects the reflector, insures a good circulation of air thereabout, and shields the patient and operator from being burned if they should come in contact with it.

In the event that it becomes necessary to replace the reflector D, it is only necessary to remove nuts 24 to release the reflector so that it may be readily removed and replaced.

The structure of the lamp is such that its outward appearance presents a substantially uniform and unobstructed surface which greatly enhances its appearance, the protruding rim of the reflector, because of its highly finished surfaces, greatly adding to the finished appearance thereof.

Having thus described my invention, what I claim as no and desire to secure by Letters Patent of the United States is:

1. A therapeutic lamp con'iprising a casing open at the front, a concave reflector having a circumferential outwardly offset portion at its periphery forming a shoulder on the outer wall of the reflector, disposed within said casing, said shoulder resting against the peripheral edge of the casing, means for mounting a radiant energy generating unit in said lamp with the active portion thereof in front of said reflector, and means for securing said reflector against movement. with respect to said casin 2. A therapeutic lamp reflector casing comprising a parabolic-like outer shell, a relatively flat reflector within the shell and having an annular flange to provide a shoulder against which the edge of the shell is drawn and a rim projecting beyond the shoulder, a receptacle within the rear partof the shell, and means for clamping the shell, reflector and receptacle together.

3. A therapeutic lamp reflector casing comprising a flaring dish shaped reflector having an opening through its smaller end and an annular shoulder adjacent its larger end, a flaring outer shell within which the reflector is mounted, a receptacle for holding a radiant energy generating element, a plate attached to the receptacle, and a series of bolts each of which passes through the reflector, shell and plate to anchor the parts together and draw the outer shell against 1 the shoulder of the reflector.

4. A therapeutic lamp reflector easing comprising a flaring outer shell having an opening through its smaller rear end, a reflector within the outer shell, a cup covering the opening in the rear end of the shell, a

receptacle. located in the rear of the shell to receive a radiant energy en rating element inserted through the opening in the reflector for securing the receptacle in position within the shell, and means for securing the reflector and the en against movement with respect to the shell.'

5. A therapeutic lamp comprising a shallow reflector, a relatively deep casing partially receiving the reflector, a radiant energy generating unit, means including a plate, for mounting said generating unit free from contact with said deep casing with its inactive portions in said deep casing and its active portion in front of said reflector and other means associated with said firstnamed means for securing the reflector against movement with respect to the casing and for supporting said plate.

6. A therapeutic lamp reflector casing comprising a flaring dish-shaped reflector having an opening through its smaller end, :1, flaring outer shell within which the refleetor is mounted, a receptacle for holding :1 radiant energy generating element, a plute attached to the receptacle, a, plurality of bolts, each of which pass through the inner end of the flaring outer shell through said plate and through the inner end of the dishshaped reflector adjacent to the opening at its smaller end to draw the parts together and to support the plate with its receptacle free from contact with the reflector and shell. In witness whereof, I hereunto subscribe my name this 18th day of July, 1927.

ROLLAND H. MAXSON.

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