De'c. 31, 1946. . ' 2,413,662 R. B. THOMAS ' mulr use Filed Aug._ 21, 1945‘ ' /, ., aw / , ‘ _ V - Y - wzzvron B. I?oéggs By > . _ .' Attorney ' Patented Dec. 31, 1946 . ~ 2,413,662" UNITED STATE s PATENT OFFICE 2,413,662 LAMP BASE > Ralph B. Thomas, Beverly, Mass., assignor to Syl vania Electric Products Inc., Salem, Mass, a corporation of Massachusetts Application August 21, 1945, Serial No. 611,747 4 Claims. 401. 176-122) 1 . - of insulating material and are held together by This invention relates to discharge lamps and particularly to such lamps which are bent into curved forms and having their ends in opposed relation. , any suitable means such as the screw ‘I, the head of which‘ is seated in portion 5 and having its other end threaded in the part 6. Such construc tion permits the lamp base to be assembled upon the lamp. A pair ‘of dowel-shaped projections I‘! are formed along the edges of the ‘section 5 of base 2 and holes to match these projections i8 are formed in section 6 to prevent relative lateral - In lamps of the type indicated, it is necessary to provide special means for making the neces sary connections ‘for energizing the lamp. It is an object of the present invention to provide means for readilyv connecting the lamp to a source of power. ’ 10 chamber recesses 8 within which the endsof the lamp are loosely received. The ends of the lamp a bent tubular lamp having a base joining its ends which is rotatable into a plurality of posi tions. , . movement thereof. ' The ends of the base 2 are formed to present A further object of the invention is to provide project a substantial distance into the recesses 8 15 to insure the base will not become detached from the lamp. In the form of the invention shown in Figure 2 a relatively large central chamber 9 posed in opposed relation, a base which is readily is formed within which the flexible lamp lead applied to the lamp at a minimum cost. wires l0 are received. The interior surface of the A further object of the invention is to create , ‘a greater transmission of incident light emitting 20 chamber portion 9 may be etched or sandblasted as shown in Figure 2 or ribbed, ?uted, or other from the lamp. wise roughened as shown in Figure 3. A further object of the invention is to obtain The ends of the lamp are, or may be, of stand- ' a complete circle of light with minimum inter A further object of the invention is to pro vide in a bent tubular lamp having its ends dis ruption-caused by the base. ard construction having a reentrant ?are portion ' tube and A feature of the invention is the use of a trans 25 II and a press portion l2 within the The lead _ supporting the lamp electrodes I3. parent or translucent plastic, etched or roughened wires in ‘are preferably covered with a light-re on its surface. Another feature of this invention is the use of light-re?ecting insulating material on the lead wires. ' Still another feature of the invention is that _ ?ecting electrical insulating material'and are sol dered to the inner ends of a pair of conducting 30 pins 14, which are staked or molded in position 4 in the base section 6 and are spaced the correct no cement is used to secure the lamp to the base. distanceto be received in a socket made to re ceive them not shown in the drawing. Either two or four pins may be employed depending upon is a greater transmission of light from the lamp. Other objects, features, and advantages of the 35 the type of lamp used and its circuit require ments. invention will be apparent from the following ‘It is desirable that the base 2 be restricted in ‘ description taken in conjunction with the draw its rotation to prevent excessive twisting of the ing in which: _ . ' ‘ An angular adjustment of 180° is ‘ lead wires. Figurel is a perspective view of a lamp em su?icient to adapt the lamp to any installation. 40 bodying the invention; ‘ --_ ‘ . V A desirable means for accomplishing this end Figure 2 is a longitudinal sectional view is to form a projection l5 upon the end face of through the lamp base and socket; and ' the lamp at or near its periphery. Stop shoulders Figure 3 is a longitudinal sectional view similar are provided which engage the projection l5 at to Figure 2 showing a different embodiment of 45 the limit of the travel of the base 2. Stop shoul the invention. . ~ ders may be provided in any suitable manner. As Figure 1 shows a circular lamp I having a lamp illustrated in the drawing the portion of at least base 2 and conductor pins 3. I one of the recesses 8 formed in the section 5 of In Figure 2 the circular lamp I has end pieces the base 2 is relatively shallow in depth while 4 which desirably are parallel and symmetrical that portion formed in the section 5 is of greater 50 ly disposed in respect to a radius from the center depth and su?icient to receive projection IS. The of the lamp circle.‘ The lamp base 2 is cm differencein depth between the two portions of structed of transparent or translucent plastic _ the recesses 8 presents stop shoulders I6 which material in the form of a hollow cylinder divided engage the projection l5. > longitudinally into two sections 5 and 6, these sec tions desirably being molded or otherwise formed 55 A base of the type herein described may read An advantage of the invention is that there _ ’ 2,418,862 ily ‘be molded or otherwise formed from the‘ I lindricai base'member loosely embracing the ends many thermoplastic or thermosetting plastic ma of the lamp and extending therebetween where by the base ‘may be rotated thereon, said base be terials now in general use. It is generally more ing formed of translucent plastic, lead wires, desirable however, to use those materials which ' covered with a light re?ecting insulating material, are thermosettin'g since they are more stable-un connected to the lamp electrodes and extending der heat. It the base is formed or a transparent into said base, contact pins projecting or_ opening material it is desirable to etch ‘or sandblast the suriaces to create a more‘even illumination from into ,the‘hollow interior of the base with their other ends projecting outward for connection to the base. An irregular surface such as caused by ?uting, ribbing, or otherwise roughing the cen 10 a source of energy and means to connect said lead _ wires to said pins. I‘ tral chamber permits a larger surface for the in 2.‘ In combination with a tubular discharge cident light to fall upon and causes a greater and lamp, 2. base of translucent material having lead more even distribution of light emission through the socket. In order to reduce the amount of ' ' wires covered with light-re?ecting insulating ma light absorption from the lead wires inside the 15 socket a coating of light-re?ecting electrical in sulating material is applied to them. A base of the type herein described is favorably suited to the utilization of the incident light from the lamp terial. v, 3. An electric discharge device for forming a , complete circle of light emission, comprising a circular glass dischargetube sealed'at each of its ends to form an incomplete circle, a tubular since no cement is used in securing the lamp and 20 base of vtranslucent material joining said ends and being substantially free of obstruction, to permit socket thus leaving an unobstructed passage for diffusionthrough said base of the light from the light through the base. sealed ends of said tube‘. ' This application is a continuation in part of my '4. The combination of claim 3, contact pins ex co-pending application Serial No. 585,260, ?led March 28, 1945, which issued January 8, 1946, as 25 tending outward from said base, lead-in wires extending through the sealed ends of said tube to United States Patent No. 2,392,785. said pins, and a light-re?ecting electrically-in What I claim is: ' ~ . ,1. In combination with a tubular discharge . sulating material over said lead-wires to reduce lamp of non-linear con?guration having its ends disposed in spaced opposed relation, a hollow 057- 30 light loss by said wires. ' 1 ; ‘ RALPH B. THOMAS.