US3152764A

US3152764A - Quartz tube floodlights

Info

Publication number: US3152764A
Application number: US271302A
Authority: US
Inventors: Raymond J Rice
Original assignee: Individual
Current assignee: Individual
Priority date: 1963-04-08
Filing date: 1963-04-08
Publication date: 1964-10-13
Anticipated expiration: 1981-10-13

Description

I Oct. 13, 1964 R. J. RICE I 3,152,764-

QUARTZ TUBE FLOODLIGHTS Filed April 8, 1963 2 Sheets-Sheet 1 5 I M x 3h 9 59 e- Ma 32 I II: 4/ 2; 41-41-31 32 INVEN TOR. PA vuauo .1. 2/05 H/S A rranue'v Oct. 13, 1964 Filed April 8, 1963 R. J. me: 3,152,76

QUARTZ TUBE FLOODLIGHTS 2 Sheets-Sheet 2 INVENTOR. EA vuauo J. Ems

#15 A r-rqzuzv' This invention relates generally to floodlights and more particularly to quartz type floodlights which provide for relative high wattage output for relatively small size.

The principal object of this invention is the provision of a floodlight that will have a temperature gradient from a lamp temperature at the lamp sockets to room temperature at the box that supports the lamp, which in space represents approximately two and one-half inches. This temperature gradation is due to several factors in the construction of the several parts making up this floodlight. The reflector which is an extruded member provides for a reflector surface of conic curvature about a longitudinal focus axis and is provided with integral exterior cooling fins. This longitudinal reflector has spaced plugs, one in each end of the reflector to close the ends and provide for a support coincident with the focal axis to carry the lamp.' Threaded openings are provided in each plug and are aligned with openings through the point of curvature of the conic curvature reflecting surface. A plurality of parallel shield plates are provided with spaced openings that match with the threaded openings in the plugs and an outer terminal connecting box is also provided with matched openings. A tubular bolt means is provided to extend through these matched openings and secure the box with the reflector and the plates in assembled relation with a tubular spacer between each member. These tubular bolt means not only provide variation within the plugs, but also serve to carry the wires to the opposite ends of the floodlight. An independent tubular member or tubular spacer is provided between each of these members so that as the heat travels from the plug ends and the reflector attached thereto, it travels the tubular spacers to the first shield plate. The greatest heat loss from radiation is from the finned exterior of the reflector and from the plug k United States Patent ends and the next hottest member is this first shield plate. The temperature is then less from each shield plate until it reaches the box. By making the tubular bolts of steel and the tubular spacers, together with the reflector and plug ends and shield plates, of aluminum, the latter will absorb and radiate the heat more readily than the tubular steel bolts and thus provide a gradation in temperature which permits one to handle a lighted lamp. 7

The marginal channels are provided in the outer parallel edges of the reflector to hold a glass lens to enclose the floodlight. If channels are not formed in the marginal edges of the reflector, then the structure is provided with a hinge frame for holding the glass lens. Thus the novel structure in the form of an extrusion provides a floodlight reflector that is new and useful. The plug ends provided in the reflector have an inwardly and upwardly sloping wall which is at an angle relative to the glass and is effective in dispersing the light. This, taken in combination with the fact that the plug ends are hollow, provides a novel improvement forminganother object of this invention.

Another object of this invention is the provision of a reflector surface of conic curvature that is, in effect;

a combination of a parabola and an ellipse and provides afocal axis which is at the focus of the conic and this surface provides a second focal point approximately ten feet from the lamp wherein a lineal concentration of light is created by the crossing of the light beams along this line which is extended to a distance materially longer "ice than the lamp itself owing to the sloping sides of the plug ends which novel structure forms another object of this invention.

Another object is the provision of a swivel support coaxial .With the focal axis of the lamp for supporting the same, which swivel support is provided in the plug ends for closing the reflector which has a conic reflecting curvature coincident with and producing the focal axis.

Other objects and advantages appear hereinafter in the following description and claims.

The accompanying drawings show for the purpose of exemplification, without limiting this invention or the claims thereto, certain practical embodiments illustrating the principles of this invention wherein:

FIG. 1 is a view in side elevation illustrating the floodlight comprising this invention which is just two inches lacking the full length dimension of the actual floodlight.

FIG. 2 is a vertical section of the structure shown in FIG. 1.

FIG. 3 is a sectional view taken along the line 3-3 of FIG. 1.

FIG. 4 is a perspective View of the fioodlight shown in FIGS. 1 and 2 as supported from a tubular member.

FIG. 5 is an end view of a fioodlight comprising this invention and shown thereon a hinged lid in its closed position.

FIG. 6 is a sectional view of the structure shown in FIG. 5 with the hinge shown in its open position.

Referring to the drawings the floodlight comprising this invention is made up of a reflector 1 which as illustrated in FIG. 3 is a single extrusion of relatively thin walls and is provided with a flat seat member 2 that extends the full length of the extrusion and is provided with the spaced openings 3 which are not threaded. This extrusion 1 is provided with the laterally disposed cooling fins 4 and 5, the plane of which is substantially coincident with the focal axis 6 of the inner reflector surface 7 which has a conic curvature, the focus of which is 6 and is made up of a parabolic and ellpise to provide combined reflecting surface that will cause a majority of the light lens to intersect at a point 8 along the construction line 10 and the focal axes 6 and 8 and this line 10 may be a portion of a plane that passes through the center of the openings 3.

Another set of lateral cooling fins 11 and 12 are integral' with and project from the outer sides of the reflector 1 and are substantially parallel to the flat member 2 and extends longitudinally of the extrusion and half way between the fins 4 and 5 and the rims i3 and 14 which are each provided with inwardly and opposed channel members 15 and 16 to receive the lens or glass 17.

The ends of the reflector are closed by the plug members 18. Each plug member is identical and is provided with inwardly sloping surface 2%) that extends from the opposed grooves 15 and 16 upwardly toward the focal axis 6. The inner ends of the plug members 18 areflat as indicated at 21 and are provided with a bore 22 to receive the sockets 23 for the quartz lamp 2%. The quartz lamp is provided with tip members 25 that may compress the spring urged contact member 26 in each of the sockets 23.

The sockets are provided with an enlarged flange 27 that covers a portion of the flat ends 21 of the plugs and are secured in place by the screws 28. The outer surface of the plug is provided with an arcuate surface similar to that of the reflector surface of conic curvature and as shown in FIG. 2 a highly reflecting reflector member 39 is illustrated ,as snugly fitting the reflector surface 7 of the reflector member 1. This reflector surface is prefer- 3 in place. This reflector is likewise provided with aligned holes 31 which are aligned with the holes 3 in the reflector 1.

The ends of the reflector 1 and the highly polished reflector sheet metal abut the inner surface of the radial flange 32 on each of the plugs 1?). Each of they plugs 13 are also provided with a mating threaded opening 33 c that is aligned with the openings 3 and 31 and which terminates in the bores 22 which are solid. However, the outer surface of the plugs are provided. with the threaded bores fid which are also axially aligned with the focal axis dfor the purpose of supporting the floodlight. In such instance, the holes? and 33 would not be provided and the threaded bores 34 could'be cut through the walls into the bores 22 so that the members engaging and swivelingthe floodlight would also carry the conductors to the light.

The sloping wall Ztlis provided with an exterior sloping surface 35 and this surface is connected by means of the vertical fin members 36, 3'7 and 38- as shown in PEG. 5 which fin members and cavity asillustrated'at 4i matcrially aid in cooling the end plugs which have the highest concentration of heat owing to the fact that they support the sockets 23. Thus the heat must travel as shown in FIG. 2 throughthe reflector 3d, the reflector i and thence the tubular spacers 4i, thence through the flat shield plate 42 in the spacers 43 through'the flat shield plates 44 and the spacers 4-5 to the box member 46; Since none of these joints are as eflicient as a lax joint between metal parts, some heat is lost at the joint. However, in each stage such as the reflector 30, the reflector l, the spacers 41 function as a heat absorbing Zinc. The first shield plate 42 is primarily a heat sink that has substantially the whole of its surface exposed and it thus absorbs a material amount of. heat transmitted thereto. The same is true for the shield plate 44. Thus by thertime the heat travels through the spacers to the box as the temperature gradient is at substantially room, temperature.

Of course, a plurality of the

plates

42 and 44 may be provided and each plate would be separated by a pair of spacers such: as illustrated at 43 and 45. The greater heat dissipation required, the greater the number of shield plates and it will be noted from FIG. 6 that the shield plate'42 is materially wider than the box as and it is also wider than the shield plate 44 which is in turn wider than the box 46. Thus the plates-42 and 4d are, in. fact, shields against radiant heat as-well as act asheat sinks for the dissipation of heat to the air.

Referring again to FIG. 2 a tubular bolt 4-7 having a hexagonal head is threaded through each of the openings in the box 46, the platesd l and 42 and the holes 3 and I the flat top 2 of the reflector l, and the similar holesin the mirror reflector 3349 into the openings of the plugs 18. Each of the parts such as the reflector 1, the plugs 18, the plates 42and 44, the boxed and the tubular spacer members are preferably made of aluminum. The reflector 1 is an extrusion, whereas the mirror reflector 39 is a highly polished sheet, and it is likewise preferably aluminum but may be made of any suitable metal that will not be apt to tarnish readily. The plug ends are cast aluminum and so is the box. Thus all of these parts have a greater affinity for heat than does the bolt 47-. T has the boltsll'i may absorb heat, but they will not conduct the heat as readily as the adjacent component parts in the clamped group of assembled members made of aluminum. However, these bolts hold the whole assembly in proper relation relative to each other.

A drive screw such as illustrated at 43 in FIGS. 1, 3 and 6 will assemble and hold the sides of the reflector closely and tightly against'the plug members 18. The ends of these' plug members are cut away as illustrated at 50 in FIG. 2 to receive the edge plates 51 which are angular as illustrated in F162 and which are held to the plugs 18 by means of the screws 52. These edge plates coincide with the grooves l5 to hold the glass 17 within the rectangular frame at the mouth of the conic curvature. Thus the glass or rectangular frame that receives the glass forms a face on a single frame that is parallel to the focal axis 6 as shown in FIG. 2.

The box member 46 is provided with a lug 53 having a threaded opening 54 to receive the male end of the swivel clamp member 55, the female end 56 of which is screwed on to the end of the pipe 5'7 for supporting the whole of the floodlight as illustrated in FIG. 4.

The top of the box 46 is provided with a cover 58 screwed on and fastened by the screws 59. 7

As shownin FIGS. 5 and 6 a rectangul'ar cover member 60'is provided with a sealed glasslensfil and is hinged as illustrated at 62 to the end plugs 18. The opposite end of this cover 60 is provided with a screw fastening member 63 and secures this end to the threaded socket 64 in the plug ends 18. Thus rather than providing fixed opposed grooves, the structure shown in FIGS. 5 and 6 provides a hinged door member that engages and seals the floodlight. i In FIG. 6 there is shown an example of temperature degradations for the floodlight comprising this invention. When the floodlight is operating'a considerable length of time, the sockets 23 and the flange 27 will reach a temperature of 300 Cfdue to the close proximity of the quartz lamp 24. Then the temperature drops to 260 C. at the flat'seat member 2. As explained above heat will be transmitted from the shield plates 22 and 24 because these shields not only shield against radiant heat but also will be dissipators of heat to the air. The temperature of the shield plate 42.- will be 170 C. whereas the temperature of the shieldplate 44 being shielded by the shield plate 42 will be at'a lower temperature; namely C.

The temperature at the box 46 will be around 50 C. and this is substantially a low enough temperature that one may handle the floodlight while the floodlight is operating.

In FIG. 6 there is also shown example temperature gradients where the socket temperature is at 300 C. for the bottom of the slope surface 20 which is at a temperature of 230 C. as-well as the ends of the same which are at a temperature of 230 C. The temperature for the bottom edge of the extrusion 1 is shown as 200 C.

I claim: 7

1. A floodlight consisting of a longitudinally disposed arcuate reflector having a reflector surface of conic curvature about a longitudinal focal axis and terminating in a rectangular face in a single plane parallel to said axis, longitudinally disposed cooling fins integral with the exterior of said reflector, spaced plugs onein each end of said reflector and engaging the curvature of said reflector surface, a transverse flange on each plug radial to said axis and covering the ends of said reflector and said fins, said plugs having a sloping surface from the ends of said rectangular: face upwardly into said reflector to the focus of said conic curvature, a lamp support in said spaced plugs to receive. a lamp therebetween; a threaded opening in each plug and aligned with openings through the point of curvature adjacent the ends of said conic curvature of said reflector, a plurality of parallel shield plates each having matching-openings aligned with said openings in said spaced plugs and said openings in the conic curvature of said reflector, a box having matching openings, a tube spacer between each of said plates and between the outer plates and said reflector and said box, and'means to secure said box with said plates and tube spacers and reflectors to said plugs to provide a temperature gradation from saidlamp support to room tem- 5 3. The floodlight of claim 1 wherein said plugs provide said sloping wall of uniform thickness to provide a hollow cavity opening to the exterior to radiate heat therefrom.

4. The floodlight of claim 3 which includes fin means 7 normal to said sloping walls and in said cavity to radiate heat therefrom. a

5. The floodlight of claim 1 which also includes socket means on the outer surface of each plug and in axial alignment with said focus to support said floodlight from said floodlight' at any desirable angle and convey the electric conductors thereto.

7. The floodlight of claim 1 which also includes an insulated Wire in each tubular connection from said box to said end plugs to conduct current to said sockets to energize the floodlight.

References Cited in the file of this patent UNITED STATES PATENTS Davis Dec. 31', 1963

Claims

1. A FLOODLIGHT CONSISTING OF A LONGITUDINALLY DISPOSED ARCUATE REFLECTOR HAVING A REFLECTOR SURFACE OF CONIC CURVATURE ABOUT A LONGITUDINAL FOCAL AXIS AND TERMINATING IN A RECTANGULAR FACE IN A SINGLE PLANE PARALLEL TO SAID AXIS, LONGITUDINALLY DISPOSED COOLING FINS INTERGRAL WITH THE EXTERIOR OF SAID REFLECTOR, SPACED PLUGS ONE IN EACH END OF SAID REFLECTOR AND ENGAGING THE CURVATURE OF SAID REFLECTOR SURFACE, A TRANSVERSE FLANGE ON EACH PLUG RADIAL TO SAID AXIS AND COVERING THE ENDS OF SAID REFLECTOR AND SAID FINS, SAID PLUGS HAVING A SLOPING SURFACE FROM THE ENDS OF SAID RECTANGULAR FACE UPWARDLY INTO SAID REFLECTOR TO THE FOCUS OF SAID CONIC CURVATURE, A LAMP SUPPORT IN SAID SPACED PLUGS TO RECEIVE A LAMP THEREBETWEEN, A THREADED OPENING IN EACH PLUG AND ALIGNED WITH OPENINGS THROUGH THE POINT OF CURVATURE ADJACENT THE ENDS OF SAID CONIC CURVATURE OF SAID REFLECTOR, A BOX HAVING MATCHING OPENINGS, A TUBE SPACER BETWEEN EACH OF SAID PLATES AND BETWEEN THE OUTER PLATES AND SAID REFLECTOR AND SAID BOX, AND MEANS TO SECURE SAID BOX WITH SAID PLATES AND TUBE SPACERS AND REFLECTORS TO SAID PLUGS TO PROVIDE A TEMPERATURE GRADATION FROM SAID LAMP SUPPORT TO ROOM TEMPERATURE AT SAID BOX.