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Патент USA US2110135

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March 8, 1938. '
H_ A‘ DQUGLAS
v
ELECTRIC
LIGHTING
MEANS
‘
2,110,135
‘
briginal Filed Jan. 21, 1935 v
2 Sheets-Sheet 1
V j)
Hana A
Douglas
1 nvgm-roR
‘ ATTo'RuzYs
March 8, 1938.
H, A, DOUGLAS
2,110,135
ELECTRIC LIGHTING MEANS
0
Original Filed Jan. 21, 1955
137
2 Sheets-Sheet 2
13a-
11'”
Haiti; .Douélg-s
Iwvf. TCR
A-rroRNqs
Patented Mar. 8, 1938'
2,110,135
UNITED STATES
PATENT OFFICE ‘
2,110,135
ELECTRIC LIGHTING MEANS
Harry AiDouglas, Bronson, li?ch, assignor to
Kingston Products Corporation, a corporation
of Indiana
Original application January 21, 1935, Serial No.
2,723. Divided and this application December
10, 1935, Serial No. 53,772
5 Claims. (Cl. 240-41)
My inventionv relates to electric lighting means,
and, more particularly, to electric lighting means
23, 24. The ?lament 23 is here shown as disposed
on'the axis of the lamp, whereas the ?lament 24
such as are mounted in re?ectors, as in auto
is displaced from that axis. The lamp 20 in
mobilehead-lamps. The principal object of my cludes means providing a base 25 for the lamp.
, 5 ‘invention is to provide new and improved meansv
The base means here shown includes a generally
of these types. ‘This application is a division of cylindrical shell memben 26 in which the bulb 22
my copending application Serial Number 2,723, ‘is secured in a well known manner. The base
?led January 21, 1935.
means includes a lateral extension, which in this
In the drawings accompanying this specifica
instance is shown as including a cylindrical por
10 tion, and forming part of this application, I have tion 21 surrounding the shell 26, the cylindrical 10
shown, for purposes of illustration, certain forms portion 21 being integrally joined to another
which my invention may assume.
drawings:
, In these
_
,
Figure 1 is a side elevational view, partly in
15 section, of one embodiment of my invention;
Figure 2 is a fragmentary view of one face of
a mounting;
Figure 3 is a perspective view of a detail of
Figure 1;
20
'
_
‘
Figure 4 is a front view of a mounting, with
the detail of Figure 3‘ not completely assembled
therewith;
cylindrical portion or skirt 28 by a curved an
nular portion 29. The skirt 28 is spaced from the
shell 26, and may have its edge 30 rounded if
desired. The cylindrical portion 21 may be fas 15
tened to the shell 26 in any suitable manner.
The skirt portion 28 is provided with a plurality
of laterally extending portions, in the illustrated
embodiment, three portions, 3|, 32, 33. The per
tions 3|, 32, 33 are'shown as struck out from the 20
skirt 28, and each struck out portion is shown
as comprising a pair of radially outwardly ex—
Figure 5 is a front view, of the parts shown in
Figure 4, completely assembled;
tending portions 34, 35 and a circumferential
portion 36, joining the ends of the radially ex
Figure 6 is a section taken along the line |i—B
of Figure 1, looking in the direction of the ar
forming an aperture extending in an axial di
rows;
rection.
Figure 7 is a fragmentary sectional view, en
larged, taken on theline '|--‘| of Figure 6, look
30 ing in the direction of the arrows;
Figure-8 is a view similar to Figure 7 with the
parts in a di?erent position;
Figure ‘9 is a side elevational view, partly in
section, of another embodiment of my invention,
the lamp being fragmentarily shown;
Figure 10 is a front view, partly in section, of
parts of the embodiment of Figure 9, partly as- ‘
, sembled;
Figure 11 is a sectional view of ‘the same parts
40 as in Figure 10, with the parts completely as
sembled, the section being taken along the line
tending portions 34; 35, the portions 34, 35, 38
25
’
It will be apparent that the struck-out exten
sions 31,32, 33, may be ‘of suitable number to
secure the desired results, may assume suitable 30
forms other than that illustrated, and may be
formedin any suitable way, by hand or machine.
A method of and an embodiment of apparatus
for striking out one or more extensions ‘such as
3|, 32, 33, is disclosed and claimed in my co
35
pending application hereinbefore referred to.
.The mounting 2| is provided with a circular
aperture 31, the diameter of which is enough
larger than the diameter of the skirt 28 so that
the~ skirt 28 may be readily slipped through the .40
aperture 31.‘
The base 25 is adapted to cooperate with a
||—|| of Figure 9, the lamp being omitted; I
Figure 12 is a detail view of a part illustrated , socket means or connecting means 38. For con;
in Figures 9 through 11;
venience the connecting or socket means will be
Figure 13 is a view of a detail similar to Fig
referred to as socket means. The socket means 45
ure 12 butwith the parts in a. different position, comprises a generally cylindrical shell 39 pro
and
v
,
,
Figure 14 is a side elevational view, partly in
section, of another embodiment of a lamp in ac
cordance with my invention.
vided with a radially extending ?ange 40 from
which extend in an axial direction a plurality
of circumferentially spaced portions or bars 4|,
42, 43,, shaped in this instance to form hooks. 50
Referring to Figure 1, there is here shown an _ All of these hooks; in the illustrated embodiment,
incandescent electric lamp 211 connectedto a
mounting 2|. The mounting 2| may be a re
?ector of parabolic form. The lamp 211 com
55 prises a bulb 22 containing a pair of ?laments
are of the same form so that in the following
description reference may be had to the hook 43
which may be most clearly seen in Figure 3.
The hook 43 comprises a throat 44 and a mouth 65
' 2
2,110,135
/45 which is partly closed‘by a lip 46. The lip 46
spring 63 at one end abutting the flange 86 and
is of triangular form providing a pair of cam
surfaces 41, 48. If desired the end of the hook
vat the otherlend the bushing 8|. The contact 11 ,
may have its corners 49, 56 beveled off. The cam
The contacts 16, 11 are adapted to engage a
pair of contacts 84 provided on the base'of the
lamp 26, only one of the contacts 84 being visible
in Figure 1. The ?lament 23 of the lamp may
have one. of its terminals‘ connected to one of
the contacts '84 and its other terminal to the
shell' 26. The ?lament 24 may likewise have one
surface 41 ‘extends to the bottom 5| of the mouth
of the hook.
The width of the hook between the outer edge
52 of the lip 46 and the edge 53 of the back of
the throat 44 of the hook is such as to pass freely
10 through apertures 54, 55, 56 respectively, in the
,mounting 2| . The apertures 54, 55, 56 are here
shown as constituting radial extensions of the
aperture 31. The throat 44 of each hook is of a
width to ?t the circumferential width of a set
is similarly resiliently mounted.
of its terminals connected to the shell 26 and
its other terminal connected to a different one
.of the contacts 84, as willbe obvious to those
at‘
skilled in the art.
of apertures 51, 58, 59 respectively, which aper-'
The assembly and operation of the embodiment
tures also are here shown as constituting radial
of the invention illustrated in Figures 1 through
extensions of the aperture 31. The apertures 54,
51 and 55, 58 and 56, 59 are separated respectively
8 is as follows. When it is desired to assemble
the socket means 38 with the mounting 2|, the
hooks 4|, 42, 43 are inserted through the aper
by radially inwardly extending projections 66,
20 6|, 62, the sides of these projections de?ning
edges of the apertures 51, 58, 59v being substan
tially radial, whereas the other sides are in the
form of cam surfaces 63, 64, 65.
The radially outer margins of the apertures
25 54, 55, 56 and 51, 58, 59 lie on a circle having a
diameter substantially the same as the diameter
of the cylindrical surface de?ned by the outer
peripheries of the hooks M, 42, 43, the radial
extent ‘of these apertures being substantially
30 the same as the radial thickness of the hooks.
In connection with one use to which the em
.bodiment of Figures 1 through 8 may be put, the
hooks 4|, 42, 43 are desirably unequally spaced
about the axis of the_s‘ocket means 38, the sets
35 of apertures 51, 58, 59 and 54, 55, 56, and the ex
tensions 3| ‘, 32, 33, being correspondingly un
tures 54, 55, 56 respectively, against the bias of
20
the composite spring 1|, the ends of which abut -
the rear’ face of the mounting, until the_lip, por
tions 46 of the hooks extend beyond the front
face of the mounting 2|. The parts are then
in the position shown in Figure 4. Thesocket 25
means is then rotated in a counter clockwise di
rection, as viewed in Figure 4. _ Such rotation’
causes the throat portions 44 of the hooks to en
gage the cam surfaces 63, 64, 65, thereby forcing
the throat portionsradially inwardly.‘ Counter so _,
clockwise rotation of the socket means is con
tinued until the trailing edges 53 of the throat
portions 44 snap off of the projections 66, 6|, 62,_
the throat ‘portions moving radially outwardly
and becoming seated in the apertures 51, 58, 59. 35
The parts are then in the position shown in‘ Fig
ure 5. When axial pressure on the socket means
‘is removed, the composite spring 1| acts to move
the socket means axially toward the right as
viewed in Figure 1, thereby pulling the apexes 40
sulating member‘66, adjacent one side of which of the triangular lips,46 against the front face
equally spaced about the center of the aperture
31 and the axis of the base of the lamp respec
tively, as illustrated in Figures 1 through 6.
The socket means 38 is provided with an in
40
are radially inwardly extending diametrically op- '
of the mounting 2|.
-
‘
_
{The socket means and mounting are now
ready to have an incandescent lamp connected
45 be fastened to the shell portion 39 by means of . thereto. The lamp, such as 26, may have its
tongues, two of which 69, 16 are visible in Figure . base 25 brought into register with the inner pe
riphery of the hook portions 4|, 42, 43, and with
1. These tongues may be clinched over-the out
side of the insulating member 66. A composite the lateral extensions 3 I, 32, 33 so positioned that
. leaf spring 1| may be interposed between the in— by moving the lamp 26 axially, against the bias ,
sulating member 66 and the segmental ?anges of the contacts 16, 11, toward the mounting 2| ,
50 61, 68, so that the spring is also held between the extensions 3|, 32, 33 will come into abut 50
the ?anges and the clinched-over tongues r69, 16. ment with the front face of the mounting 2|.
The spring 1| may include an annular part 12, The lamp 26 is then- rotatedv toward the mouth
having an aperture large enough to pass the portions 45 of the hooks to thereby bring the
leading portions 35 of the lateral extensions 3|, 55
55 shell 39, the part 12 being?provided with a de
posite segmental flanges 61, 68 provided on the
shell portion 39. The‘ insulating member 66 may
sired number .of radially inwardly extending pro
32, 33 against the respective cam surfaces 48 of
jections 13 against which the insulating member ' the lips of the hooks, as shown in Figure 8. Fur
66 is adapted to be pressed. The spring 1| is ther rotation of the lamp 26 in the same direction
here shown as provided-with three legs, two of causes the portions 35, by cam ‘action on the
60 which 14, 15 are visible in Figure 3.; The legs surfaces 48,,‘to pull. the hooks 4|, 42, 43 further
14, 15 of the spring are bowed radially outwardly through the mounting 2|, against the bias of the
composite spring 1|. When the trailing edge of
intermediate, their ends and their point of con
the portion 35 passes the apex of‘ the lip portion _
nection to the annular portion 12.
The insulating member 66 is here shown as 46, the parts are brought to the position shown
carrying a pair of contacts 16, 11, each of these‘ in Figure '7 in which the‘ends of the lipportions 85
contacts being connected to a conductor, only one
46 of the hooks are disposed in the axially ex
of which, 18, is visible. The conductor passes
tending apertures formed between the radial por
tions 34, 35 of the extensions 3|, 32, 33. The
through a sleeve 19 provided with a ?ange 86
adapted to be engaged by the head of the con
70 tact 16. The sleeve 19 is slidable in a bushing 8|,
‘
>
parts are so proportioned that the apex of the >
lip portions 46 is then out of contact with the
the bushing passing through the insulatingmem
front face of the mounting 2|, so that surfaces '
ber 66 and being ?xed thereto in any suitable
manner as by providing beads 82 on the bushing.
of the lateral extensions 3| , 32, 33, opposed to
the face of the mounting, are maintained in ?rm
A spring 83 'is provided for urging the contact
75 16 away from the insulating member 66, the
engagement and registry with the front face
of the mounting 2|.
76
3
v2,110,185 _
The hereinbefore described embodiment of my
invention is well-adapted for use where the aper
ture 31 is an’ aperture located in the crown of a
parabolic reflector, concentric with the axis of
the re?ector. For such use the lamp is prefer
ably provided with three lateral extensions, 3|,
32, 33, as shown in the drawings, and is pre
focused, that is, the position of the lateral exten
tions of the aperture 86 to thereby form the por
tions 91, 98, 99 of the mounting, of a radial extent
substantially the same as the thickness of the
.hooks.
The mounting 85 is provided with another set
of apertures I88, I 89, H8, which, when the hooks
98, 9|, 92 are assembled with the mounting, are
adjacent the circumferentially outer edges of the
sions til, 32, 33 is so chosen that the general plane ‘ lips 95,'and extend radially beyond the radially
10 of these extensions is so positioned that the light
outer margins of the apertures I85. I86, I8'I. ‘
ing center of the ?lament 23 is not only on the
axis of the reflector, but is at the focal point of
/the reflector. The ?lament 24, which may be
used either alone or in combination with the ?la
15 ment 23, therefore is also disposed at a predeter
mined position with respect to the re?ector, for
the reason that the lamp 28 may be connected
to the re?ector at but one predetermined posi
tion about its axis because of the unequal spacing
20 of the apertures 51, 58, 59 and the correspondingly
unequal spacing of the hook portions 4|, 42, 43v
and the lateral extensions 3|, 32, 33. Further
The mounting 85 is provided with another set
of apertures III, H2, H3 adjacent the set of
apertures I82, I83, I84, and both of these sets
of apertures have radially outer margins which
are at an angle to a radius of the aperture 86. 15
substantially the same as the angle of the tangent
bent portion of the throats 93. These sets of
apertures consequently form triangular projec
tions H4, H5, H6, the apexes of which lie on
a circle larger than the aperture 86 by an amount
substantially equal to the radial thickness of the
hook portions 98, 9|, 92. The circumferential
more, the contacts 84 in the base are caused to width of each of the pairs of apertures I82. III
properly engage the desired respective contacts and I83. H2 and I84, II 3 is su?icient respectively
25 ‘I6, 'I‘I so that the switching device (not shown)
to pass the circumferential width of the reduced \ 25
connected to the contacts ‘I6, 11 will be able to ends of the hooks 98, 9|, 92 respectively. Due
cause current ?ow in the ?laments 23, 24 in the .to the unequal circumferential spacing of the
desired relations.
apertures I82. I83, I84, the aperture II2 merges“ ‘
Figures 9 through 13 illustrate another em
30 bodiment of my invention, in which the lamp 28,
35
with the aperture II8.
' The socket means may be provided with an 30
here shown as identical with the lamp 28 of Fig
ure 1, is'assembled with a mounting 85 having a
circular aperture 88 which is of such diameter
as to freely pass theskirt 28 of the base of the
insulating contact carrier II1 similar to the con
tact carrier 66 of Figure 1, but in this instance
no spring ‘II is provided, so that the contact car
lamp 28.
ing segmental flanges H8, H9 on the shell por
tion 88. The contact carrier I I ‘I may be fastened
to the shell member 88 by means of clinched
_
>
A connecting means or socket means 81 is pro
vided, having a shell portion 88. The shell por
tion 88 has a radial ?ange 89 provided with axially
circumferentially spaced portions 98, 9I, 92 made
40 in the form of hooks. The outer peripheries of
the portions 98, 9 I, 92 de?ne a cylindrical surface,
' with exceptions to be noted hereinafter.
tongues I28.
8
'
The contact carrier II‘! is here shown as carry-.
ing a pair of contacts I2I, I22 which are con 40
nected to conductors and resiliently biased toward
the contacts 84 on the lamp base in a manner
Each hook has a throat portion 93 and a mouth
94, along with a lip portion 95 partially closing
45 the-mouth of the hook. The lip 95 may have a
' beveled outer corner to act as a cam surface, if
desired.
rier II‘I directly abuts radially inwardly extend
The bottom 98 of the mouth of each
hook is adapted to overlie portions 91, 98, 99 of
the mounting 85. The radially inner edges of the
50 portions 91, 98. 99 are de?ned by the aperture 88.
The edges of each of the hooks 98, 9|, 92 oppo
site the lips 95, are undercut from the ends of
the same as already described in connection with
Figure 1.
The embodiment of the invention illustrated in 45
Figures 9 through 13 is assembled and operated
in the following manner. The hook portions 98.
9|; 92 are brought into registry with the pairs of
apertures I82, III and I83, H2 and I84, II3 re
spectively and thrust through these composite 50
apertures until the shoulders I8I abut the rear
face» of the mounting 85. The socket means is
the hooks, the undercut extending axially along , then rotated in‘a counter clockwise direction. as
a line I88. partially into the throat portion 93. viewed in ?gure 10, whereby the triangular pot
.55 to a shoulder I8I. The shoulder IN is axially‘ tions II4, II 5, H6 force the hooks radially in 55
spaced from the bottom 96 of the mouth of the wardly. As the counter clockwise rotation con
hook by an amount substantially the same as the v tinues the leading edges of the lips 95 ride ra
thickness of the mounting 85.
_
The throat portions 93 of the hooks, to and
w including the edges I88 ,of the hooks are bent
radially outwardly, so that, as can be seen in
Figures 10 and 11, the bent throat portions have
radially outer surfaces tangent to the cylindrical
surface de?ned by the hooks 98, 9|. 92. Those
65 parts of the throat portions 93 which terminate
in the shoulders I8I are also bent radially out
wardly. in this instance slightly more than the,
dially inwardly onto the inner peripheries of the
mounting portions 91, 98, 99, which action may
be assisted by the beveled edges of the portions 60
91, 98, 99. Further counter clockwise rotation
causes the trailing edges of the lips 95 to snap
into the apertures I85, I85, I81.. At the same
time the trailing edges I88 of the hooks snap off
The reduced parts of the throat portions 93
of the hooks are adapted to be seated in aper
tures I 82. I83, I84 in the mounting 85. The lips
of the triangular projections H4, H5, H8, there 65
by seating the reduced portions of the necks 93
in the apertures I82, I83, I84 respectively. The
parts are then in the position shown in Figure V1],
in which the socket means is latched?both against
rotational movement in either direction, and 70
against any substantial axial movement in either
95 of the hooks are adapted to be vseated in aper- -
direction.
edges I88.
‘
tures I85, I88, I81 respectively. The apertures ‘
In the assembled position of the socket means
I82, I83, I84 and.l85, I88, I81 are hereshown , in the mounting 85, the lips 95 of the hooks ex
75 as constituting radially outwardly extending por
tend in an axial direction toward the right, as 75
'1 2,110,135
viewed in Figures 9,172, and 13, beyond the, rear skirt portion I40 forms an integral part of the
4
,
.
-
,
v
,
face of the mounting 85, ‘a predetermined de- . shell I39, whereas in the lamp 20 the base means
is made in two parts comprising generally a shell
,
a
The parts as shown in the position in Figure 11 portion 26 and the skirt portion 28 is suitably
are ready to receive and have'connected thereto fastened thereto. ' The skirt I40 may be provided
a lamp 20. The lamp is ?rst’ positioned with the with a plurality of struck-out extensions, corre
skirt 28 of the base in registry with the aperture sponding to the extensions 3|, 32, 33 of the lamp .
86, and with the lateral extensions3l, 32, 33 in 20, two‘ of which 3 la and 320. are shown in Figure
registry with the apertures ‘I08, I09, H0. The 14. The lamp I36, as in thecase of the lamp 20,
lamp is then moved axially, against the bias of may be provided with a pair .of ?laments (not 10
'
the contacts I2I, I22, thereby causing the lateral ’ shown). .
extensions 3|, 32, 33 to pass through the aper-_ » . From the foregoing it will be apparent ‘to those
tures I08, I09, IIO to a position axially beyond skilled in the art that my invention provides new
the rear face of the mounting 85. The lamp 20 ‘and improved electric lighting means, and ac
15 may then be rotated in such direction that the. cordingly accomplishes the principal object of‘
‘my invention. On the other hand, it also will '
lateral extensions 3|, 32, 33 enter the mouth por
tions 94 of the hooks, whereupon the lamp may ' be obvious to those skilled in vthe art that the.
be released, theresiliently biased contacts I2I, particular embodiments herein described may be
I22 moving the projections 3|, 32, 33 towards the variously changed and modi?ed, without depart
sired amount.
bottoms 96 of the mouth portions 94, and‘seating
‘ing from the spirit of my invention, or sacri?cing 20
‘
those projections directly'against the rear face the advantages thereof.
In general, the disclosure herein is illustrative
of the mounting 05, as can be seen from Figures
'9 and 13. The resiliently biased contacts‘ I2I, I22 only, and my invention is not limited thereto.
I claim:
'
not only force the projections 3|,‘ 32, 33 against
1. In combination: a mounting, for an incan 25
25 the rear face of the mounting 85 but force the
bottoms 96 of the hooks against the front face ‘ descent electric lamp, having an aperture; an in
candescent electric lamp having a bulb ;' base
of the mounting.
As in the embodiment of Figures 1 through 8, means,'for said bulb, including a shell portion
fastened to said bulb, and an annular part, joined
the embodiment of Figures 9 through‘ 13 is adapt
to said shell portion and extending parallel to and 30
30 ed to be used in instances where the aperture 86
is located on the axis of va parabolic re?ector. spaced from said shell portion, said annular part
‘ For reasons already pointed out in ‘connection being insertable into said aperture; means, for .
with Figures 1 through 8, the lamp 20 may be‘ ' accurately positioning said lamp with respect to
of the pre-focused type, which is accomplished by
35 properly locating the lateral extensions 3|, 32, 33
on the base with respect ‘to the ?lament 23 and
with respect to the focal point of the re?ector.
The lateral extensions 3|, 32, 33 may be prop
erly located on the base by making a- lamp, com
40 plete except for the lateral extensions or posi
tioning means 3|, 32, 33, then adjusting such a
lamp to a predetermined position and then while
the lamp is in that predetermined position form
ing the positioning means on the base.
A method of and one embodiment of appa
ratus for making pre-fo'cused incandescent lamps
of the type herein shown and described, is dis1
closed in'my hereinbefore mentioned copending
application.
50
4
'
As a result of this method, the plane de?ned
by the faces of the struck-out extensions 3|, 32,
33, which faces are intended to abut; the mount
ing, will be so related, say to the ?lament 23, that
the lighting center of that ?lament will be in’ a
55 line normal to that plane, that normal line inter
secting that plane at a point equidistant from
the several extensions 3|, 32, '33; and further
‘ more, so that the lighting center of the ?lament
said mounting, including a'plurality of circum
ferentially spaced portions struck. out from the 35
body of said part; and means for pressing said
struck-out portions against said mounting._
2. In combination: a mounting, for an incan
descent electric lamp, having an aperture having
its radially inner marginal portions de?ning a
circle; an incandescent electric lamp having a
bulb; base-means, for said bulb, including a shell
portion fastened to said bulb, and an annular
part, joined to said shell portion ‘and extending
parallel to‘ and spaced from‘ saidshell portion, 45
said annular part ?tting slidably in said aper
ture; means, for accurately positioning. said lamp
with respect to said mounting, including a plu—
rality of circumferentially spaced portions struck
out from the ‘body of said part; and means for 50
pressing said struck-‘out portions against said
mounting.
>
"
3. In combination: a mounting, for an incan
descent electric lamp, having an aperture; a
socket unit having parts radially inner peripheral 55
portions of which de?ne a cylindrical surface, said
parts ?tting slidably in said mounting aperture;
an incandescent electric lamp having a- bulb; '
base-means, for said bulb, including a shell por
tion fastened to said bulb, and an annular part,
'joined at one end to said shell portion extending
parallel to and spaced from said'shell portion,
from the plane defined‘ by the‘ points of contact said annular part ?tting slidably in said cylindri
cal surface; means, for accurately positioning
between the surface of the re?ector-and the ex
said lamp with respect to said mounting, includ 65
65 tensions 3I, 32, 33. ,
.
Figure 14 shows a form'of lamp, I36, which ing a plurality of circumferentially spaced por
may be used in place of the lamp 20. The lamp tions struck out from the body of said annular
part; and said socket ‘unit including means for
I 36 is similar to the lamp 20 hereinbefore de
scribed, but in this instance the lamp may have pressing’ said struck-out portions against said
a bulb I31 which is mounted in a' base I33 hav
70
4. In combination: an incandescent electric
ing a shell portion I39 and a skirt portion I40
' which is an integral part of the shell_|39, spaced lamp having a bulb; base-means, for said bulb,
therefrom and connected thereto by the curved . including a shell portion fastened to said bulb,
annular portion I4I. ' The principal difference and an annular part, joined to said shell portion
between the lamp I36-and the lamp 20 is that the and extending parallel to and spaced from said 76
23 will be at a predetermined distance from that
60 plane, or, in case the mounting is a re?ector, so
that that predetermined distance will be the same
as the distance of the focal point of the re?ector
mounting.
-
-
'
2,110,135
5
,
shell portion; mounting means, for 'said lamp,
having a portion extending transversely to the
said parts ?tting slidably in said mounting aper
annular part, said struck-out portions abutting
ing said lamp with respect to said mounting, in
cluding a plurality of circumferentially spaced 10
portions extending radially outwardly from said
annular part; and said socket unit including
ture; an incandescent electric lamp having a
axis of said lamp, said portion having an aper
bulb; base-means, for said bulb, including a shell
ture through a lateral face through which said portion fastened to said bulb, and an annular
annular part extends; means, for accurately po— ' part, joined at one end to said shell portion ex 5
sitioning said lamp with respect to said mounting tending parallel to and spaced from said shell por
means, including a plurality of circumierentially tion, said annular part ?tting slidably in said cyl
spaced portions struck out from the body of said indrical surface; means, for accurately position
10 said lateral face; and means for pressing said
struck-out portions against said lateral face.
5. In combination: a mounting, for an incan
descent electric lamp, having an aperture; a sock
et unit having parts radially inner peripheral
15 portions of which de?ne a cylindrical surface,
means for pressing said circumferentially spaced '
portions against said mounting.
.
HARRY A. DOUGLAS.
15
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