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Патент USA US2117755

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May 17, 1938.
H. A. DOUGLAS
v2,117,755
ELECTRIC LIGHTING DEVICE
Filed March 2, 1956
2 Sheéts-Sheet 1
43
41
/ i4
66
68
Harry A. Douglas
/
I NVLNTOR
BY M, MMM74°UW
ATTORNiT?
‘ May 17, 1938.
H. A.‘ DOUGLAS
2,117, 755
ELECTRIC LIGHTING DEVICE
Filed March 2, 1936
2 Sheets-Sheet 2
' Bx M, JMWM%/M
‘ ATTORNEYS.
‘
2,117,755
Patented May 17, 1938
‘PATENT OFFICE
UNITED STATESamass
ens-mare non-mm nmcs
Harry A. Douglas, Bronson, mollualllgliorto
Kingston Prodacin corporation. a mtion
of Indiana
Am ma 2. 1m, Serial No. “as:
5 Claims. (01. 244-41)
My invention relates to electric lighting de
vices, and more particularly to electric lamp units
comprising an incandescent electric lamp mount
ed in a re?ector, as for example, in an automobile
headlight, and the principal object of my inven
tion is to provide a new and improved lighting
device and unit of this type.
In the drawings accompanying this speci?ca
tion, and forming part of this application, I have
shown, for purposes of illustration, one form
the ?ange 21 is, in this instance, circular in out
The ?ange 21 is provided with, desirably
three, axially extending projections 23 formed by
making depressions 3. in the opposite face of the
?ange 21. The base is further “provided, in this 5
instance, with two lateral projections in the form
of cylindrical pins 3|, 32, for a purpose which will
' line.
appear. The pins 3|, 32 are circumferentially
spaced less than 180°, as may be seen in Figure
9, and are in a plane spaced from the plane of the 10
which my invention may assume. In these draw? ?ange 21. The collar 28 is provided with slots
33, 34, to enable the collar to be slipped over the
ings:
Figure 1 is a vertical sectional view, certain pins 31, 32.
The re?ector 21 is here shown as being pro
parts being fragmentarily shown, of one embodi
ment of my invention,
Figure 2 is a front elevation of a detail,
Figure 315 a side elevation of parts of a hold
ing means or socket unit, forming part of the
embodiment of Figure 1, before they are com
pletely assembled,
Figure 4 is a front elevation of the holding
means or socket unit, forming part of the em
bodiment shown in Figure 1,
Figure 5 is a side elevation of the holding
means shown in Figure 4,
Figure 6 is a fragmentary sectional view taken
on the line G—-6 of Figure 4,
Figure 7 is a front elevation of the mounting
with the holding means, shown in Figures 4 and
5, assembled therewith,
Figure 8 is a side elevation of the parts shown
'
in Figure 7,
_
Figure 9 is a section taken along the line 9—9
of Figure 10, looking in the direction of the
arrows,
Figure 10 is a side elevation of the incandescent
electric lamp used in the embodiment of Figure 1,
the bulb of the lamp being fragmentarlly shown,
and
Figure 11 is a perspective view of the rear of
the mounting.
Referring to‘Figure 1, the embodiment of my
invention here illustrated is shown as including an
vided with a cup-shaped extension 35 including 15
a rearwardly extending cylindrical portion 36,
the‘ inner periphery of which‘ is shown-as slightly
spaced from the radially outer periphery of the
lamp ?ange 21, but which may gage this outer
margin, that is, snugly fit it. The cup-shaped 20
extension 35 also includes an apertured plane
end or bottom 31, seen most clearly in Figure 11.
The bottom 31 is provided with a central aperture
38, su?lciently large to permit easy passage of
the shell 25 of the lamp base. Extending radially 25
outwardly from .the central aperture 38 are three
generally rectangular circumferentially spaced
recesses 39, thereby leaving three generally seg
mental ?anges 40. When the ?ange 21 is in the
position shown in Figure 1, the three axially ex- 30
tending projections 29 abut respectively the front
surfaces of the three segmental ?anges 40. By
front and rear are meant parts presented toward
or away from the light producing source of the
lamp 20.
35
In order to hold the lamp 20 assembled with
the re?ector 2| in the position shown in Figure
1, a holding means or socket unit 4| is provided.
This holding means 41 comprises a shell 42, de
sirably of generally cylindrical form, which may 40
be seamless, and desirably formed of sheet metal.
The holding means also includes a biasing means
43, ?xed to the shell 42, the biasing means in
incandescent electric lamp 20, adapted to be , this instance comprising a ring 44 of sheet metal,
suitably connected to a mounting 2 I, the mounting provided with circumferentially spaced portions, 45
being in this instance a re?ector fragmentarily
shown. The lamp 2D is provided with a base 22,
which in this instance includes laterally extend
ing positioning means 23. The base includes a
‘ shell 25 and the laterally extending portion of
the base comprises a collar 26 surrounding the
shell 25 and a radially extending ?ange 21 on
the collar. The collar 26 may be fastened to the
vshell 25 in any suitable manner, as by soldering
28 (see Figure 9). As may be seen in Figure 9,
here three in number, extending in a generally
radial direction outwardly from the ring 44, and
looped or bent radially inwardly so as to form
spring loops 45. The free ends of the spring
loops 45 are detachably connected to the re?ector 50
by bayonet connections. To this end, the re?ector
is here shown as provided with three axially rear
wardly extending projections 46 of generally
plane form. These projections may be formed
from metal, left in forming the circumferentially 55
2
2,117,755
spaced recesses 39. The projections 46 are here
shown as having straight axially extending mar
gins-95, 86, the distance between which is less
than-the width of the recesses 39. Each of the
projections 46 is provided with a slot 41 extend
ing from one axial edge, 85, thereof transversely
into the projection a predetermined distance.
The front margins 48 of the slots 41 are desirably
formed by the junction between the rear face
10 of the end ?ange 31 of the tubular projection 35
on the re?ector and the radially outer end of
each recess 39. In this instance the margins 48
are in the planes of the radially outer faces of the
projections 46. The width of the slots 41 is de
15 sirably approximately the same as the thickness
of the free ends of the spring loops 45.
The spring loops 45 are provided near their
free ends with transverse slots 49 extending from
one margin thereof a predetermined, distance.
The width of these slots 49 is approximately the
. same as the thickness of the rearward projections
46 on the re?ector.
At the margins of the free
ends of the spring loops 45, opposite the margins
into which the slots 49 extend, is provided a front
, wardly extending shoulder 50, here shown, as
formed by bending frontwardly a portion of the
radially extending margin of each spring loop
(see Figure 6).
The shoulders 5|] serve to engage
' margins 5| of the recesses 39 and prevent rota
30 tion of the holding means 4| when the holding
means is mounted on the re?ector.
The spring
loops 45 and the projections 46 may be unequally
spaced circumferentially if desired.
The ring portion 44 of the biasing means has
a central aperture 52 of approximately the same
diameter as the outside diameter of the shell 42,
and extending radially inwardly from the aper
ture 52 are, in this instance, three circumfer
entially spaced projections 53, 54, 55, of unequal
40 circumferential extent, adapted to be seated in the
bottoms of complementary axially extending re
cesses 56, 51, 58 at the rear end of the shell 42.
The holding means 4| serves also to carry an
insulating contact carrier 59, the outside diam‘
45 eter of which is substantially equal to the inside
diameter of the shell 42 and has radially out
wardly extending projections 69, 6|, 62, desirably
complementary to the three axially extending re
cesses 56, 51, 58 in the rear end of the shell 42,
50 so that the contact carrier 59 may be assembled
with the shell in only one relative rotative rela
tion. When the contact carrier 59 is assembled
with the shell 42 its front face abuts the rear face
of the ring 44. In order to hold the contact car
55 rier 59 to the shell, rearwardly extending ?ngers
63 are provided on the shell 42, which may be
clinched radially inwardly over the rear face of
the insulating contact carrier 59. '
The contact carrier 59 is adapted to carry
60
contacts 64, 65, these contacts being desirably
contact 65, the cooperating contacts 12, 64 being
directly behind the contacts 13', 65. The provision
of a plurality of contacts on the lamp base en
ables the use of a multiple ?lament lamp, the
lamp being here shown as provided with two
?laments 14,‘ 15, one of which, 14, may desirably
have its lighting center at some predetermined
point with respect to the re?ector, as, for example
at the focus, and the other of which,‘15, may be
displaced from the ?lament 14, and may be used 10
for providing dim light or so-called tilted light.
The ?laments 14, 15 have their terminals con
nected in a well known manner to the lamp
base 22 and to the contacts 12, 13 on the lamp
base. _,The'pas'sage of current to either one 01'
both of the ?laments 14, 15 may be controlled
in anv suitable manner, by switching means
(not shown) interposed in the conductors 66, 61.
The shell 42 of the holding means 4| is pro—
vided with bayonet slots 16, 11, each slot having
an axially extending entrance portion 18, con
nected by a‘ slanting portion ‘19, proceeding in
partly a circumferential and partly an axial di
rection to a generally rounded seat portion 89.
The bottom 84 of the seat portion 80 is disposed 25
frontwardly of the junction 8| between the
frontward margins of the slanting portion 19 and
the seat portion 89, so that the approach to the
shoulder formed by the junction 8| is by cam
surfaces 82, 83.
30
When the lamp 20 is in assembled position
with the re?ector 2| and holding means 4|, as
shown in Figure 1, the pins 3|, 32, are seated
on the bottoms 84 of the vseat portions of the
bayonet slots 16, 11, Accordingly the bayonet
slots 16, 11 are disposed circumferentially in the
shell 42, complementarily to the pins 3|, 32.
‘
In assembling the unitary holding means 4|
the biasing means 43 is ?rst assembled with the
shell 42 by slipping it over the rear end of the
shell with the projections 53, 54, 55 in registry
with the axially extending ‘recesses 56, 51, 58 at
the rear end of the shell.
The contact carrier
59, with the contacts carried thereby, is then
assembled with the assembled shell 42 and bias
ing means 43 by bringing the radially extending
projections 69, 6|, 62 into registry with the
axially extending recesses 56, 51, 58 in the shell
42 and then clinching the ?ngers 63 over the
rear end of the insulating carrier 59. The hold 50
ing means 4| then has the appearance as illus
trated in Figures 4 and 5.
In assembling the holding means 4| with the
re?ector 2|, the free ends of the spring loops 45
are ?rst brought up against the desired rear
faces of the segmental ?anges 4|] respectively and
the holding means 4| is then turned in a clock
wise direction, as viewed from the rear of the
re?ector 2|, whereupon the margins of the slots
49 in the spring loops 45 will embrace the un
slotted portions of the rearward projections 46
and swedged to the ends of conductors 66, 61 on the re?ector and the margins of the slots
respectively. The conductors 66, 61 are disposed 41 in the rearward projections 46 will embrace
in sleeves, one of which, 68, is visible in Figure 1, the unslotted portions of the spring loops 45.
65 each sleeve being slidable within a bushing 69,
Meanwhile, the shoulders 59 bear against the
which is ?xedly mounted, in any suitable man
rear faces of the segmental ?anges 40, and, as
ner, as by beading, through the insulating car
rotation of the holding means 4| is continued, the
rier. Each sleeve is surrounded by a spring 19 trailing margins. of these shoulders 50 will snap
between the bushings 69 anda ?ange 1|, each frontwardly oiT of the margins 5| of the recesses
70 sleeve abutting the respective contacts 64, 65.
39. When the parts have reached this position 70
The contacts 64, 65 are adapted to make contact the ends of the slots 41 and 49 are desirably
respectively with a pair of contacts 12, 13 on the in engagement, so that further clockwise move
base of the incandescent lamp 20. One of the ment of the holding means 4| is prevented, and
contacts (13) on the base of the lamp 29 is shown counter clockwise movement is prevented by
in Figure 1 as in contact with the Spring pressed abutment of the shoulders 50 with the margins 75
formed as enlarged heads on shanks ?tted over
3
2,117,755
5|.
variously changed and modi?ed, or features
thereof, singly or collectively, embodied in other
combinations than those illustrated, without de
parting from the spirit of my invention, or sacri
?cing all of the advantages thereof, and that "-1
accordingly, the disclosure herein is illustrative
only, and my invention is not limited thereto.
The assembled re?ector 2| and holding
means 4| appear as in Figures 7 and 8.
When it is desired to assemble the lamp 20
with the‘ assembled re?ector 2| and holding
means 4|, the shell portion 25 of the base of
the lamp 20 is inserted through the central
aperture 38 in the re?ector and the pins 3|, 32
are brought into registry with the axially ex
tending entrance portions 18 of the bayonet slots
10 ‘I6, 11 in the shell 42, axial movement of the
lamp toward the re?ector being continued,
against the bias of the contacts 64, 65, and of
I claim:
'
.
1. In combination: an incandescent electric
lamp having a base; a re?ector; said base hav 10
ing a lateral extension abutting said re?ector at
the front thereof; means for engaging said base;
biasing means, unitary with said engaging means,
for biasing said engaging means to cause said
lateral extension to abut said re?ector; said 15
the spring loops 45, until the axially extending
projections 29 abut the front faces of the ?anges
15 40. At this time the pins 3|, 32 are in a posi
tion to engage the cam surfaces 82 of the bayonet
biasing means including a resilient member serv
ing to support said engaging means from said
re?ector; and said re?ector and said resilient
member being so, constructed and arranged that
they make bayonet connection with each other 20
seated by rotation of said biasing means about
its axis relative to said re?ector.
2. In combination: an incandescent electric
lamp having a base including a lateral extension
and including also a portion, separate from said 25
lateral extension, having a surface extending
transversely to the axis of said lamp; a mounting
member; means. constructed and arranged to en
gage said surface and thereby pull said lateral
extension toward said mounting member; auxil 30
iary means, unitary with said engaging means,
constructed and arranged to bias said engaging
slots ‘Hi, ‘|'|, upon rotation of the lamp 2!) in a
clockwise dir-t:ction as viewed from the front of
the re?ector 2 I. Upon such rotation of the lamp
20 20, cooperation between the pins 3|, 32 and the
cam surfaces 82 causes the shell 42 to be moved
i'rontwardly against the bias of the spring loops
45, until the pins 3|, 32 pass the ‘shoulders 8|,
whereupon the bottoms 84 of the seat portions
25 of the bayonet slots 16, 11 are drawn against
the front sides of the pins 3|, 32, by the bias
of springs 45, and the projections 29 on the
lamp base ?ange are consequently pressed against
the front faces of the re?ector ?anges 40, the
30 parts being then in the position shown in Fig
,ure 1.
It will be evident that since the ?ange 21 is
accurately pre-positioned with respect to its dis
tance from the ?laments 14, 15 and the direction
of the plane of the ?ange is pre-positioned with
respect to the axis of the lamp, and, furthermore,
since, the pins 3|, 32, in conjunction with the
means to cause said lateral extension to abut
said mounting; contact means, carried by said
auxiliary means, constructed and arranged to 35
cooperate with said lamp ; said auxiliary means
including a resilient member; and said resilient
bayonet slots 16, TI, permit assembly of the lamp
member and said mounting member including
20 with the re?ector 2|. in only one relative ro
tative relation, the ?laments 14, 15 will assume
that said resilient member is detachably mounted
connection means so constructed and arranged
the desired predetermined position 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 direc
tion, the pins 3|, 32, in cooperation with the
cam surfaces 83 of the bayonet slots 16, 11,
causing the shell 42 to be pulled frontwardly
until the pins ride over the shoulders 8|, the
cam surfaces 82 thereafter riding along the pins
3|, 32, the shell 42 being permitted to move
50 rearwardly as the pins 3|, 32 move circumfer
entially. When the pins 3|, 32 reach the axially
extending portions 18 of the bayonet slots 76, 11,
on said mounting member and said resilient
member alone serves to support said auxiliary
means from said mounting member.
3. In combination: an incandescent electric
lamp having a base including a lateral exten
sion and including also a portion, separate from
said lateral extension, having a surface extend
ing transversely to the axis of said lamp; a
mounting member, abutted by said lateral ex
tension at one side thereof, said surface being 50
disposed at the other side of said mounting mem
ber; means for engaging said surface, said sur
face and said engaging means being so con
the lamp may be withdrawn by axial movement
away from the re?ector.
The holding means 4| may be removed from
the re?ector 2| by pressing the shoulders 50
structed and arranged that movement of said
engaging means away from said other side of 55
said mounting is adapted to move said base in
the same direction; contact means, carried uni
rearwardly enough to permit releasing rotation
tarily with said engaging means, constructed and
arranged \to cooperate with said lamp; and
‘of the holding means. Rearward movement of
the shoulders 50, as distinguished from bodily
rearward movement of the entire free ends of
the spring loops 45 is possible since the axial
margins 85 of the projections 46 are spaced from
the margins 5| of the recesses 39, so that the
free ends of the loops may ?ex about the front
ward ends of the margins 85.
From the foregoing it will be apparent to those
skilled in the art that the illustrated embodi ,
ment of my invention provides a new and im-'
means for biasing said engaging means in said 60
direction thereby to cause said lateral extension
to be pressed against said mounting.
4. In combination: an incandescent electric
lamp having a base including laterally extend
ing means having portions de?ning a plane trans
verse to the axis of the lamp; a mounting mem
ber abutted by said laterally extending means
thereby to de?nitely position said plane; an aux
iliary mounting member; means for supporting
proved electric lighting device and unit, readily
said
and conveniently constructed and assembled, and
accordingly, accomplishes the principal object of
my invention. On the other hand, it also will
be obvious to those skilled in the art that the
mounting member, so constructed and arranged
that said auxiliary mounting member is movable
relatively to said lamp, axially of said lamp, and
75 illustrated embodiment of my invention may be
auxiliary
mounting member
from ' said 70
is biased to a position away from the light source
of said lamp; said auxiliary mounting member 75
2,117,755
and said lamp including means for connecting
said lamp to said auxiliary mounting member;
vided with a base having contact means; said
base being disposed in said aperture and having
said connecting means including a slot in said
a lateral extension constructed and arranged to
auxiliary mounting member, and a projection
carried by said base constructed and arranged
to cooperate with said slot; said slot and said
abut said mounting; said mounting having in
projection being so constructed and arranged
that rotation of said lamp causes said auxiliary
mounting member to move toward the light
10 source of said lamp thereby to press said lat
erally extending means against. said mounting
member.
5. In combination: a mounting having an aper
ture and having a plurality of circumferentially
spaced recesses extending outwardly from said
aperture; an incandescent electric lamp pro
tegral circumferentially spaced projections dis
posed around said aperture at the ends of said
recesses; said projections extending laterally
from one side of said mounting; and means,
carrying contact means cooperable with said
contact means on said base, constructed and. 10
arranged to be detachably supported by said
mounting projections and so as to press said
lateral extension into abutment with said
mounting.
HARRY A. DOUGLAS.
1
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