US 2117756 A
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May W, w38. i H. A. DOUGLAS 2,117,756? I ELECTRIC LIGHTING DEVICE Filed March 2, 1936 u 2 Sheets-Sheet 1 Harry AyDoulas AT TORNLYS May 17, 193s. H. A. DOUGLAS 2,117,756
ELECTRIC LIGHTING DEVICE 'Filqd March 2, 195e 2 Sheets-Sheet 2 Hang A. Denstlas ]NvllrrroRl BWL@ www .ATTRNEYS Patented May 17, 1938 ELECTRIC morirme DEVICE Harry A. Douglas, Bronson, Mich., assigner to Kingston Products Corporation, a corporation of Indiana Application March 2, 1936, serial No. 66,653
My invention relates to electric lighting devices, and more particularly to electric lamp units comprising an incandescent electric lamp mounted in a reflector, as for example, in an automo- 5 bile headlight, and the vprincipal object of my invention is to provide a new and improved ing device and unit of this type.
`In the drawings accompanying this specication, and forming part4 of this application, I
have shown, for purposes of illustration, several forms which my invention may assume. In these drawings:
Figure l1 is a vertical sectional view, certain parts being fragmentarily shown, of one embodiment of my invention, along with aside elevation of a line connector `which may be used with said embodiment,
Figure 2 is a perspective view of a detail,
Figure 3 is a front elevation of the detail shown in Figure 2,
Figure 4 is a fragmentary section taken along the line 4-4 of Figure 3,
Figure 5 is a section, taken on the line 5-5 of `Figure 6, of a detail portion of a lamp used in the embodiment of Figure 1,
Figure 6 is a fragmentary side elevation of the parts shown in Figure 5, and is a plan `View of the parts corresponding thereto in Figure 1,
Figure 'l is a plan view of the connector which is shown in side elevation in Figure 1,
Figures 8 and 9are sections taken on the lines 3--3 and 9-9 of Figure 7, looking in the direction of the arrows,
Figure- 10 isa side elevation, partly in longitudinal fragmentary section, of a connector pin before assembly in the embodiment of Figure 1,
Figure 11 is a section, taken on the line -I I--Ii of Figure 12, looking in the direction of the'arrows, of a complete lamp used in the embodiment of Figure 1,
Figure -12 is a side elevation of such a lamp,
the bulb being shown fragmentarily,
light-- Figure 13` is a fragmentary front elevation of I a mounting or reilector used in the embodiment of Figure 1,
Figure 14 is a vertical sectionall view, certain parts being fragmentarily shown, of another embodiment of my invention,
Figure 15 is a section, taken on the line IE-IE of Figure 16, looking'in the direction or the arrows, of a detail portion oi a lamp used in the embodiment of Figure 14,
. Figure 16 is a side elevation of the detail por-V f l the smaller portion 33,
f tion of the lamp shown in Figure 15, and
, Figures 17 and 18 are iront and side elevations respectively of a detail .of the embodiment of Figure 14.
Referring to Figure 1, the embodiment of my invention khere illustratedis shown as including an incandescent electric lamp 20, adapted to be suitably connected to a mounting 2|, the mounting being in this instance a reilector fragmentarily shown. .The lamp 20 is provided with a base 22, which in this instance includes laterally extending positioning means 23. The base includes a shell 25, and the laterally extending portion o f the base comprises a collar 26 surrounding the shell and a radially extending flange 21 on the collar. .The collar 26 may be fastened to the shell 25 in any suitable manner, 15 as by soldering 28 (see Figure 5); As may be 'seen in Figure 5, the ilange 211s, in this instance, circular in outline. The flange 21 is provided with, desirably three, axially rearwardly extending projections 29 formedby making depressions 20 30 in the opposite face of the ange 21. By the term front is meant that side of a part presented toward the light producing source of the lamp'ZD, while the term rear is used with 'reference to the opposite side. The reector 2| is here shown as being provided with a cup-shaped rearward extension or pocket 3l, including a rearwardly extending cylindrical portion 32, the inner periphery of which is shown as slightly spaced from the radially 30 outer periphery of the lamp'ange 21, but which may gage this outer margin, that is, snugly fit it. The cup-shaped extension 3| also includes an apertured plane end or bottom 33, seen inv front elevation in Figure 13. The bottom 331s,
provided with a central aperture 34, here shown as considerably larger than the shell 25 of the lamp base. Circumferentially; desirably unequally, spaced' about the central aperture 34 of the reector are, 40 in this instance, three compoundapertures 36, 36, 31. Each compound aperture comprises an arcuate smaller portion 33 and an arcuate larger portion 39, circumferentially spaced. from the smaller portion 33, the larger and smaller aper- 45 ture portions 38. 39 being joined by a connecting portion tapering irom the larger portion 33 to the smaller portion 33. The margins of the connecting portion 40 are in this instance arcuate and generally tangent to the larger arcuate por- 5o tion 39, while the junction between the connect-V ing portion 40 and the smaller portion 38 is narrower than the diameter of the circle deilned by thus forming humps 4I atthe junction. 55
The lamp 20 is held in the position shown in Figure 1 by means including connectors 42, 43, 44, desirably three in number, and all identical so that only one needs to-be described in detail. The connector 44 is visible in Figures l1 and 12.
Each connector 42, 43, 44 is in the form of al 42, 43, 44 against the seats formed by the margins of the smaller aperture portions 35, and at the same time to press the lamp flange 21 against the bottom 33 of the cup of the reector 2i, biasing means is provided, this being here shown in the form of acircumferentially corrugated annular sheet metal spring 69. The spring 49 may have, as viewed fromthe front, three crests 50, 5I, 52 in a common plane, and three troughs 53, 54, 55 in a common plane, the crests 59, 5I,
52 being provided with apertures 55, in alinernent with the apertures 48 of the lamp flange, through which apertures 56, the Shanks of the connectors 42, 43,l 44 are disposed. The crests 50, 5l, 52 of the spring 49 bear against lateral projec-y tions 51 at the ends of the shanks 45 of the con`A nector pins, 'and the rear faces of the troughs 53, 54, of the spring 49 bear against the front face of the lamp ange 21. The result is that, since the frustro-conical portions 41 of the connector pins are seated in the seats provided by the smaller aperture portions 38, and the connector pins therefore cannotmove frontwardly. the flange is biased, by/ the spring 49, toward the bottom 83 of the reector pocket, and hence the projections 29 are pressed against the bottom 33.
The spring 49 may bedrawn to its corrugated shape from sheet metal stock and then pierced and trimmed, or `formed in any. other suitable way.
In order to make electrical connectionto the lamp 20, the lamp is here shown as provided with type; and these plug termlnalsare here shown as of a-different crosssectional diameter, but otherwise similar. Each plug terminal 58, 59 has a frustro-conical end portion 50 and an annularfurrow 5 I, spaced somewhat from the frustro-conical end portion. Cooperable with the plug terminals 58, 59 is a line connector 62 of insulating material in which are disposed two sleeves 83, 54, as may be seen in Figure 8, the inside diameters of which correspond respectively to the outside diameters rof the plug terminals 58, 59, and which are spaced to cooperate with the plug terminals. Each conducting sleeve 53, 54 may be provided with a detent 55, struck inwardly from .each sleeve, these 'detents 65'being spaced from the left hand end of the connector (as viewed in Figure '1), and so designed that when the plug terminals 58, 59 are pushed into the left hand end of the line connector 52 the detents 55 will resiliently yield and slideup the frustro-conical end surfaces 59 oi the respective plug terminals, and thenl snap into the annular iurrows 5|. 'I'he right hand end of the line connector 82 is here shown as provided witha pair of conducting sleeves 55 of the same di.- ameter, and these sleeves 55 may be respectively integral with the sleeves 58, 59 at the left hand end. The sleeves at the right hand end may also be provided with detents 51, struck in from the sleeves, and are thus cooperable with plug conductor terminals of the snap type, similar to those provided on the lamp base. The provision of la plurality of contacts 58, 59 on the lamp base enables the use of a multiple filament lamp, the lamp being here shown as provided with two laments, one of which, 58,may desirably have its lighting'center at some predetermined point with respect to the reflector, as for example at the focus, and the other of which, 59, may be displaced from the filament 68, and may be used for providing dim light or socalled tilted light. The laments 58, 59 have their terminals connected in a well known manner to the lamp base 22 and to the contacts 58, 59 on the lamp base. The
passage of current to either one or both of the illaments 68, 59 may be controlled in any suitable manner, by switching means (not shown) suitably electrically connected to the lamp 2li through the line connector 62.
The mode of assembly and operation of the embodiment shown in Figure 1 is as follows. The shanks 45 of connector pins such as shown in Figure 10, for example, (which may be hollow as shown in Figure 10), are inserted through the apertures 48 in the lamp flange 21, from the rear of the ange 21, and also through the apertures 55 in the corrugated spring 69. With the spring 49 pre-stressed, that is, with the troughs 53, 54, 55 in abutment with the flange 21 and with the crests 50, 5|, 52 moved toward the front face of the flange 21, and while the small ends of the frustro-conical surfaces 41 of the connector pins 42, 43, 44 abut the rear margins of the apertures 48 in the iiange 21, as shown in Figure 12, the shanks 45 of the connector pins are squeezed or swedged transversely, locally, near their ends, thereby forming the lateral projections 51, thus holding the spring in its pre-stressed condition. The lamp 20 is then complete as shown in Figures 11 and 12.
When it is desired to assemble such a lamp 20 with the reector 2|, the heads 45 of the pins are brought into registry with the larger aperture portions 39 of lthe compound apertures 35. 36, 31. 'I'he lamp is then moved axially rearwardly (the heads 46 passing through the aperture portions 39), until the axial extensions 29 on the lamp iiange 21 abut the front face of the bottom 33 of the reector pocket. The lamp 20 is then rotated in a clockwise direction, as viewed from the front of the reflector, therebycausing the margins of the tapering portions 40 of the compound reilector apertures 35, 35, 31 to interengage with the frustro-conical surfaces 41 on the connector pins 42, 43, 44. As rotationof the lamp 20 continues, this interengagement causes the connector pins to be pulled rearwardly, against the bias of the spring 49, until the frustroconical surfaces 41 of the'pins pass the humps 4I at the junctions between the tapered aperaccurately preLp'ositioned with respect to its distance from the filaments 58, 59, and the direc- `by a bayonet connection. To this end the shell tion of the plane of the flange is pre-positioned with respect to the axis of the lamp, and, turthermore, since, due to the unequal circumferential spacing of the connector pins 42,- 43, 44, in conjunction with the` corresponding/unequal circumferential spacing of thecompound apertures 35, 36, 31, the lamp may be assembled with the reflector in only one relative rotativerelation, and the laments 88, 89 will assume the desii-ed predetermined position with respect to the reflector 2| when the parts are assembled as in Figure 1.
Removal of the lamp 20 may be effected by simply rotating it in a counter-clockwise direction, whereupon the frustro-conical surfaces 41 of the connector pins 42, 43, 44 will become unseated from the smaller aperture portions 38, against the bias of the spring 49, and further rotation of the lamp will bring the heads 48 of 11 is provided with two bayonet slots 18, 19 each of which has an axially extending portion 88 and a circumferentially extending portion 8|, thelatter terminating in a seat 82, these bayonetslots 18, 19 being positioned circumferentially so as to be cooperable with the pins 18', 1| on the lamp base. The contact carrier includes an insulating member |13 having an outside diameter such as tot within the shell 11, and having three circumferentiallyspaced radial projections, one of which, 84, is visible in Figure 18, adapted to t A in three axial extending recesses in the rear end of the shell 11,v oneof the recesses, 85, being visible in Figure 18. The projection 84`and recess 85 may be larger than the other projections and recesses, so that the insulating member 83 may be assembled with the shell 11 in but one relative rotative relation. In order to hold the the pins into registry with the larger aperture portions 39, whereupon the lamp may be removed in anaxial direction. Such removal of the lamp 28 ofcourse causes the line connector 62 and 'the conductors (not shown) connected thereto to be pulled through the central aperture 34 in the reflector 2|, whereupon the lamp 28 may be disconnected from the line connector 82 and another lamp plugged into the connector, whereupon the new lamp may be connected to the reflector in the manner hereinbefore described.
Referring to Figure 14, this shows another embodiment of my invention. A lamp 28a is utilized in the embodiment of Figure 14, and parts of this lamp which are similar' or substantially similar to parts of the lamp- 28 of the embodiment of Figure 41 have been given the same reference numerals with ,the suffix a, while added parts and parts having` a different` embodiment are given different reference numerals. The lamp 28a,
shown partly completed in Figures 15 and ,16,
comprises a base 22a having a shell 25a, and a laterally extending positioning means 28a, but in this instance the base 22a' is further provided with two lateral projections 18, 1| inthe/'form of cylindrical pins, for'a purpose which will appear. 'Ihe pins 18, v1| are circumjerentially spaced less than 180, as may be seen in Figure 15, and are in a plane spaced from the plane of the flange 21a. The collar-28a is provided with .slots 12, 13 to enable the collar to be slipped over the pins 18, 1|, andV thereafter soldered to the shell 25a.
`The ange 21a of the lamp is provided, as in the case of the lamp 28, with apertures 48a through which, in .the completely assembled lamp,
the Shanks 45a of three connector pins are disposed, two of which,l42a,' 43a', are visible in Figure 14. These three pins are held assembled with the flange 21a and the heads 48a of the pins are v biased toward the flange 21a by a. spring 49a corresponding to the spring 49 of the embodiment of Figure 1, in the manner already set forth in' connection with that embodiment. v
The Alamp 28a.v is further distinguished from the lamp l28 of the embodiment of Figure 1 in that instead of the base 22a beingprovided with contacts 14, 15 at the end of the base. vOne of these contacts 14 is not visible, being directly behind the contact 15 visible in Figures 14 and 16.
In order to make electrical connection to the contacts 14, 15 on the lamp base, a contact carrier 18 is provided, (instead of the line connector 62), comprising in this instance a cylmdrical shell 11 adapted to be slipped over the shell 25a of the lamp base and to be connected to the base iingers, extending rearwardly from the shell, may
be provided, and clinched radiallyinwardly over the rear face of the insulating member.
, IIhe insulating member 83 is adaptedto carry contacts 81, 88, these contacts being desirabiy formed as enlarged heads onsh'anks fitted over and swedged to the ends of conductors 89, 98 respectively. The conductors 89, 98 are disposed in sleeves, one of which, 9|, is.visible in Figure 14, each sleeve being slidable within a bushing 92, which is xedly mounted, in any suitable manner, as by beading, through the insulating member 83. Eachsleeve, 9|, is surrounded by aI spring 93 between its bushing 92 and a flange 94 on each sleeve abutting the respective contacts 81,88. i
The contacts 81, 88 are adapted to make contact respectively with the contacts 14, 15 on the base of the lamp, when the contact carrier 16 is assembled with the lamp 28a, as shown in Figure- 14; The springs 93 serve to bias the conltacts 81, 88 into rm engagement with the con- 28amay be connected to the base 22a and to the lamp contacts 14, 15and may be, controlled in a manner as already, described in connection with the lamp 28 and its contacts 4,58, 59.
The reflector 2|a, used in the embodiment of Figure 1 4, is constructed similarly to the reector 2| of the embodiment of' Figure 1, and as is obviprovided with two butt type ous, the lamp 28al is connected thereto in the same manner.
When it is desired to remove the lamp 28 from the reflector 2|a, the lamp is rotated counterclockwise, viewing the reflector from the front, whereby, as in the case of the embodiment of Figure 1, the frustro-conical portions 41a of the connector pins 42a,4 43a, 44a ride rearwardly out of the seats formed by the smaller aperture portions 38a. of lthe compound .apertures in the re- `lector 2m, and upon continued rotation,'the
lamp 28a may be, removed as already explained in connection with the lamp 28 of the embodiment of Figure 1. In this instance also, the contact carrier 16, analogously to the line connector 62, will be drawn through the central aperture 34a in the reflector, whereupon the lampV 28a may be disconnected from the contact carrier 18 by disengagement of the pins 18, 1| out of the bayonet slots 18, 19, as will be apparent.
illustrated embodiments of my invention may be variously -changed and modified, or features thereof, singly or collectively, embodied in other combinations than those illustrated, without departing from the spirit of my invention. or sacriiicing all of the advantages thereof, and that accordingly, the disclosure herein is illustrative only, and my invention is not limited thereto.
1. An incandescent electric lamp, comprising: a bulb; base-means for said b ulb; said basevmeans including a lateral positioning extension for abutting a mounting means, and including .also additional means for connecting said lamp to a mounting means, said additional means including a plurality of circumferentially spaced projections extending slidably through said positioning extension, said projections each-having a lateral extension at one end-thereof disposed on the same side of said positioning extension, said basemeans including also resilient means constructed and arranged to so bias said projections that said lateral extensions on said projections are biased toward said positioning extension.
2. In combination: an incandescent electric lamp having a base including a lateral positioning extension; a mounting plate abutted by said .l lateral positioning extension; means for connecting said ylamp and said mounting plate, said connecting means including a portion of said mounting plate provided with a pluralityvof circumferentially spaced slots, and a plurality of circumferentially spaced projections carried by said base and constructed and arranged for cooperation with said respective slots; said projections having lateral extensions at their ends cooperable with said respective slots,'means biasing saidprojections so that said lateral extensions on said projections are biased toward said positioning extension; vkand said lateral extensions and said slots being so constructed and arranged that rotation of said lamp causes said connecting means to press said positioning extension against said'mounting plate.
3. In combination: an incandescent electric lamp having a base includinga lateral positioning extension; lmounting means abutted by said lateral positioning extension; means for connectingI said lamp and said mounting means, said connecting means including a portion of said mounting means provided with a plurality of circumferentially spaced slots, and a plurality of circumferentially spaced axially extendingprov jections carried by said base and constructed and arranged for cooperation with said respective slots; said projections having lateral extensions Aat their ends cooperable with said respective slots; means biasing said projections so that said lateral extensions on said projections are biased toward said positioning extension; and said connecting means being so constructed and arranged that said slotted portion and said projections are relatively movable in a direction both axially and circumferentially with respect to the axis of said lamp and so that rotation of said lamp c auses such cooperation between said-lateral extensions on said projections and said slots that said connecting means presses said positioning extension against said mounting means.
4. In combination: an.incandescent electric lamp having a base including a lateral positioning extension; a mounting plate abutted by said lateral extension; means for connecting said tending slidably through said positioning extenv sion and constructed and arranged for cooperation with said respective slots; said projections having lateral extensions at4 their ends cooperable with said respective slots; means biasing said projections so that said lateral extensions on said projections are biased toward said posijections being so constructed and arranged that rotation of said lamp causes said connecting means to press said positioning extension against said mounting plate.
5. In combination: an incandescent electric lamp having a base including a lateral positioning extension; a mounting plate abutted by said positioning extension at one side thereof; means for connecting said lamp and said mounting plate, said connecting means including a portion of said mounting plate provided with a plurality of circumferentially spaced slots, and a plurality of circumferentially spaced projections carried by said base and extending slidably through said positioning extension and constructed and arranged for cooperation with said respective slotls; said projections having lateral extensions at ltheir ends cooperable with said respective slots and abutting said mounting plate at the other side .thereof; and resilient means, carried by said base, constructed and arranged to so bias said projections that-said lateral extensions .on said projections are pressed against said other side of said mounting plate.
HARRY A. DOUGLAS.
tioning extension; and said slots and said pro-