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Патент USA US2385634

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Sept. 25, 1945.
2,385,634 '
Filed July 21, 1943
John J. MaLLOH,
His A't'iror'neg.
Patented Sept. 25, 1945
2,385,634‘ ‘
‘ '
John J. Malloy, Cleveland Heights, Ohio, assignor
to General Electric Com pany, a corporation of
New York
Application July 21, 1943, Serial No. 495,790
5 Claims. (Cl. 176-32)
My invention relates to electric incandescent
lamps and similar devices comprising a bulb
to' a base structure for such devices.
One 01' the most common forms of base con
struction in use at present on electric incan
energy translation element or ?lament (not
shown) connected to the inner ends of the lead
in wires I5, I6 and sealed with the bulb I0.
Secured to the neck II of the bulb is a base
structure I1 according to the invention. The
said base comprises a molded cup-shaped body
II of insulating material, such as glass, having
descent lamps coniprisesa threaded metal shell,
usually of-brass, having a glass insulator button
shaped end wall portion 20.‘ The side wall I9
having an electricalsenergy translation element
or ?lament sealed therein and a base on said
bulb. More particularly, my invention relates
fastened to one end thereof and a metal end
contact or eyelet (likewise usually of brass) se
cured to the said button and insulated thereby
a cylindrical ‘side wall portion I9 and a button- _
of the glass body I8 is so shaped as to ?t snugly
around the neck II or the bulb with the rim 2I
of the side wall I 9 abutting or ?tting against
the shoulder I2 on the bulb.
Inasmuch as the base of
The base I1 may be secured to the neck ll of
a lamp is usually discarded along with the other
parts thereof upon bum-out of, or other dam 15 the bulb by means of a plurality of locking keys
or pins 22 which extend through apertures 23
age to the lamp, the metal 01' the base shell and
in the cylindrical side wall I9 of the glass body
eyelet is accordingly wasted upon discarding
the lamp.
I! and are formed with internal heads 24 which
?t into corresponding shallow dish-shaped de
One object of my invention is to provide a
screw-thread base arrangement for electric in- - 20 pressions 25 in the neck II of the bulb. Two of
such locking keys 22 are. preferably employed,
candescentdamps and similar devices which is
the said keys being located at diametrically op
simple and economical in construction and’
posite points on the glass body Ill. The keys 22
which utilizes a minimum amount of metal.
are made of a readily fusible metal such as sol
A feature of the invention is the use of a
metal strip ‘or band which is spun or wound 25 der, and are formed by inserting the solder un
der pressure, while in a molten state, into the
» into the form of a screw-thread on the neck 01'
apertures 23 in the glass body I8 so as to 110W
the-bulb or on a cup-shaped glass body‘attached
into and completely ?ll the said apertures as
to the bulb neck, the bulb neck or the glass body
well as the shallow depressions 25 in the bulb
preferably being provided with a screw-thread
neck ll.
molded on the cylindrical exterior surface‘
The cylindrical side wall portion I 9 of the
thereof and over which the metal strip is spun
glass body I8 is provided with an external screw
or wound to form a screw-thread side .contact
from the metal shell.
for the lamp.
\ thread formed in part by conductor means in
the form of a narrow metal strip or band 26,
Further objects and advantages of my inven
tion will appear from the following description 35 of brass or other suitable non-corrosive metal,
of species thereof and from the accompanying
drawing in which:
Fig. 1 is a partial longitudinal sectional view,
on an enlarged scale, of a portion of an electric
which is disposed in a helix on the outer sur
face 21 of the cylindrical wall I9 of the glass
body I8. As shown _in Fig. 1, the metal strip
26 is of arcuate cross-section to form the top or
incandescent lamp provided with a base struc 40 convex portions of the screw-threads. The
valley or trough portions of the screw-thread
ture comprising my invention; Fig.2 is an ele
is formed by the outer surface 21 of the cylin
vation of the portion of the lamp shown in Fig.
drical wall I! itself. The helical metal strip 26
1; Fig. 3 is a transverse sectional view taken
on the line 3-3 of Fig. 1; Fig. 4 is a transverse 45 is of su?lcient length to form at least one, and
preferably one and one-half complete threads.
section taken on the line H of Fig. 1; Fig. _5
To lock the helical metal strip 26 against rota
is a perspective detail view of the metal screw
tion on the cylindrical wall I9, the opposite ends
thread conductor element of the base shown in
of the strip are suitably secured or anchored to
Figs. 1-4; Fig. 6 is a longitudinal section on the
line 6—6 of Fig. 7 of a modi?ed form of base 50 the said wall. For this purpose, the metal strip
26 is provided with inwardly bent tongues 28, 29
construction comprising my invention; and Fig.‘
at its opposite ends, which tongues extend
7 is a transverse section on the line 1-1 of Fig. 6.
through suitable apertures in the wall I9 and are
Referring to Fig. 1, the lamp there shown
bent back around the inner surface 30 of the said
comprises a glass bulb I0 provided with a cylin
wall, as indicated at 3| in Figs. 3 and 4. Prefer
drical neck portion II, the said neck portion
55 ably, the tongue 28 at that end of the metal'strip
being of reduced diameter so as to form a shoul
2G nearest the rim 2| of the glass body I8 extends
der I2 on the bulb. ,Sealed within the bulb i0
through one
is a conventional ?lament mount structure com
keys 22 and
prising a re-entrant stem l3, an exhaust tube I4,
a pair of lead-in wires I5, l6, and an electric 60 aperture by
tongue 29 at
of the apertures 23 for the solder
is ?rmly held in place in the said
the solder key therein, while the
the other end of the metal strip 26
‘extends through a slit-shaped aperture 32 (Fig.
2) in the wall l9 of the'glass body.
To provide a firm support for the metal strip
‘26 and prevent displacement’ thereof longitudi
nally of the cylindrical wall l9, suitable pro
tuberant positioning and support means are pro
vided, preferably in the form'of a continuous heli
‘_ cal ridge or screw-thread 33 molded on the outer
surface 21 of the said wall 19 and over which 1
the said strip ?ts tightly. The ?xation of the op
, posite ends of the metal strip 26 to the glass
body 18 by the tongues 28, 29 holds the strip in
place against rotation on the helical positioning
; ridge 33. Instead of employing a ridge 33 of con
thereof. Thus, instead of mechanically attach
ing the base I‘! (Figs. 1-5) to the bulb neck ll
by means of the solder keys 22, it may be secured
to the bulb neck by conventional basing cement.
What I claim as new and desire to secure by
Letters Patent of the United States is:
1. An electrical device comprising a bulb hav
ing a neck portion and a base mounted on said
neck portion and comprising a molded body. of
insulating material having a cylindrical wall por
tion surrounding the bulb neck, said bulb' neck
having a plurality of depressions therein and the
cylindrical base wall having a. plurality of open
ings opposite said depressions, a plurality of lock
ing keys of easily fusible metal ?lling the said
tinuous form, the positioning means for the metal 15, depressions and openings in said bulb neck and
‘ strip 26 may be constituted by a plurality of
spaced protuberances disposed in helical forma
1 tion around the cylindrical wall IQ of the glass
base wall tosecure the base to the bulb neck, con
ductor means wound around and secured to the
said wall portion and arranged to de?ne a helix
‘ body IS. The metal strip 26 may be applied to
for engagement with the screw-threads of a
the molded screw-thread 33 either by spinning or
socket, one end of said conductor 'means being
wrapping it therearound, or by preforming it - embedded and anchored in one of'said locking
1 into screw-thread shape and then slipping'it over
keys, and a leading-in wire embedded in the said
the end of the ‘bulb neck into place on the molded
one locking key and electrically connected thereby
screw-thread 33.
to the said conductormeans.
' '
The metal strip 28, in addition to serving as a 25
2. An electric lampbase comprising a cylindri
screw-thread for securing the lamp in a socket,
insulating material with a .
cal wall portion of
also serves as the side contact for the lamp. For
helical screwthread of at least one full tum
this purpose, one lead-in wire I! of the lamp is
formed on its outer surface, and contact. means
consisting of a helically formed narrow metal’
suitably connected to themetal strip 28,~pref- .
erably by embedding the said lead-in wire in that
band of at least one full tum conforming to the
solder key 22 which contacts the tongue 28 of
pitch of said screw thread and wrapped around
the metal strip 26. The other lead-in'wire I6 is
the surface thereof, said band having inwardly
connected to a suitable bottom or center contact ‘ V
34 preferably in the form of asmall button of
35 in the outer surface ‘ 85
‘ solder disposed in a recess
of the buttoneshaped end‘wall 20 of the glass
The said
lead-in wire l6 extends‘
bent ends anchored in cavities in said vwall por
3. An electric lamp base comprising acylindri
cal wall portion of insulating material with a
helical screw thread of at least one full turn
through an aperture 36 inthe said'end wall 20
formed on its outer surface, and contact means
of the ‘glass body and is embedded in the solder 40 consisting of a- helically formed narrow metal
The modi?cation shown in Figs. 6-7 differs,
from the previousform of the invention‘in that
the glass body eliminated and the helical
metal strip or band 31 mounted instead directly
on the bulb neck I l which, for such purpose, may
be provided with a molded screw-thread 38 over
which the metal strip 31 is applied, as before.
’ The said strip 3'! is- secured against rotation on
the molded screw-thread 38 by bending its op
posite ends inwardly and back upon themselves
to form tongues 39, 40 which extend into and ‘are
locked within undercut depressions or recesses
4|, 42 in the cylindrical wall of the bulb neck l I.
Leading-in‘wire I5 is suitably connected to the
metal strip 31, preferably to that end of the strip
nearest the end of the bulb neck H. For this
purpose, the end wall of the bulb may be-v formed
with an outer groove or channel 43 which extends
to the recess 42 and through which the lead-in
Wire I5 extends into the recess 42 where it is
band of at least one full'tum conforming to'the
pitch of said screw thread and being curved'in
cross-section in conformity with the crest of‘ said »
screw thread, said band being wrapped around‘
the crest of said screw thread and having in
wardly bentrends anchored in cavities in said
wall portion.
4. .An electric lamp base comprising a cylindri
cal wall portion of insulating material with a
helical screw thread of approximately one and a
half turns formed on its outer surface, and con-
tact means consisting of a helically formed nar
row metal band of approximately one and a half ‘
turns conforming to the pitch of said screw
thread and wrapped around the surface thereof,
said band having inwardly bent ends anchored
in cavities in said wall portion.
5. An electric lamp comprising a sealed bulb ‘
having lead-in wires extending therefrom, and a
base portion of insulating material having arheli
cal screw thread of at least one full turn formed ~
suitably secured, as by soldering,to>the tongue 40 7 on its outer. surface, and contact means consist
of the metal strip 31. The'other leading-in wire
ing of a helically formed narrow ‘metal band of
I6, is connected to a suitablerbottompor'end con
at least one full turn conforming to the pitch
tact 48 on an insulating (preferably glass) but
‘ of said screw thread and wrapped around the
ton .45 cemented'lor otherwise attached to the 65 surface thereof, said band having inwardly bent
end of the bulb neck. As shown, the end contact
ends anchored in cavities in said base portion, one‘
VM'may be in the form of a metal eyelet l6 fas
of said lead-in wires extending into one .-of said
tened to, the insulator button 45 and 'to which
cavities and being soldered therein to an end of
the leading-in wire I6 is soldered.‘
said band.
' '
WhileI have shown and described the pre
other modi?cations are Possible within the scope
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