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Патент USA US3082359

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March 19, 1963
J. J. ZECCA ETAL
3,082,349
FILAMENT CONNECTION FOR ELECTRIC LAMPS
Filed March 18, 1960
FIG. I.
INVENTORS.
JOHN J: 25609 "a
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AGENT
United States Patent 0 M CC
1
3,082,349
FILAMENT CONNECTION FOR ELECTRIC LAMPS
John J. Zecca, Belleville, and Walter J. Decker, North
Bergen, N.J., assignors to Westinghouse Electric Cor
poratiou, East Pittsburgh, Pa., a corporation of Penn
sylvauia
3,082,349
Patented Mar. 19, 1963
2
bimetallic clamp with a pair of specially shaped jaws in
‘accordance with this invention;
FIGS. 6 and 7 are plan views of other types of clamps
according to the invention; and
FIG. 8 is a view corresponding to FIG. 5 but illustrates
another type of clamping apparatus and clamp con?gura
tion.
While the invention may be advantageously employed
to join various types of elements one of which is heat
This invention relates to electric lamps and, more par 10 sensitive, it is especially adapted for use in connecting the
ticularly, to an improved ?lament connection for a ?ash
bimetallic member of a ?ashing incandescent lamp to the
ing incandescent lamp.
?lament thereof and has accordingly been so illustrated
Recently there has been developed and marketed a
and will be so described.
so-called “?ashing” incandescent lamp wherein the ?la
FIG. 1 there is shown a ?ashing incandescent lamp
ment is intermittently energized and de-energized by 15 10Inwhich
comprises an envelope 11 having a ?lament 12
means of a bimetallic element that is attached directly to
sealed therein that is supported in thedesired con?gura
one end of the‘ ?lament and adapted, in response to
tion by a plurality of supports 18, a lead-in conductor 20
changes in the ?lament temperature, to switch the ?la
and a bimetallic member 22. The aforesaid supports and
ment into and out of the circuit. The bimetallic member
bimetallic member are embedded in and insulated from
Filed Mar. 18, 1960, Ser. No. 15,856
6 Claims. (Cl. 313-271)
is in the form of a ?at strip that is free to ?ex and is so 20 one another by a button 14 formed on the end of a
disposed that when thermally actuated it makes-and
vitreous support such as a re-entrant ‘glass stem 16. As
breaks contact with one of a pair of lead-in conductors
shown, the ?lament 12 is connected at one end to the
sealed into the lamp. The other end of the ?lament is
lead-in conductor 20 and at its“ opposite end to the bi
connected to the other of said conductors and the ?lament
metallic member 22 which member is normally disposed
is thus periodically lighted by the action of the bimetal to 25 in pressure contact with another lead-in conductor 24.
produce a scintillatnig or ?ashing effect that is useful in
Both of the aforesaid conductors are, in turn, sealed
decorative lighting and for warning and advertising pur
through the stem 16 and connected with a base 26 at-‘
poses. A lamp of the aforesaid character and the result
tached to the sealed end of the envelope 11.
ant advantages over the prior art ?ashing arrangements
' As shown more clearly in FIG. 2, the bimetallic mem
are described in detail in US. Patent No. 2,901,667 dated
ber 22 comprises a ?at strip of dissimilar metals such as
August 25, 1959.
a layer of nickel-steel alloy known in the art as “Invar”
For reasons of economy and simplicity of construction
and a layer of copper or silver, which layers are bonded
the ?lament is connected to the free end of the bimetallic
‘together. The bimetallic strip is disposed in heat-receptive
strip by means of a clamp that is formed on the end of the
relationship with the ?lament ‘12 and is adapted in re—
strip and closed around the ?lament. While this type of 35 sponse to changes in the temperature thereof to ?ex and
connection e?ects the juncture of the aforesaid members
intermittently connect the ?lament to the lead-in con
without soldering or welding, it presents a serious problem
ductor 24, thereby periodically completing the circuit and
in that the bimetallic clamp tends to ?ex and open up
producing the desired ?ashing of the ?lament. Flashing
when cooled or heated, depending upon whether the end
incandescent lamps of this type are well known in the art
of the strip is bent toward the side of the bimetal that has 40 and are described in detal in the aforesaid US. Patent
the higher or lower coefficient of expansion. As a result,
No. 2,901,667.
the ?lament gradually becomes loose within the clamp as
As shown in FIG. 2, the ?lament .12 is connected to the
the latter ?exes with changes in temperature and may
i imetallic member 22 by means of a ?at clamp that is
eventually drop out of the clamp and render the lamp
closed around and ?rmly grips the end of the ?lament.
inoperative.
45
It is accordingly the general object of the present in
vention to provide a‘ ?ashing incandescent lamp that can
be economically manufactured and will have a long use
ful life.
A more speci?c object is the provision of a connection
joining the ?lament and bimetallic element of a ?ash
ing incandescent lamp or the like which can be quickly
and inexpensively fabricated and maintains the aforesaid
members securely interlocked one with another through
out the useful life of the lamp.
A better understanding of the invention will be ob
tained by referring to the accompanying drawing wherein:
FIG. 1 is a perspective view of a ?ashing incandescent
lamp that incorporates the improved ?lament connection
of this invention;
FIG. 2 is a perspective view on a greatly enlarged scale
of the bimetallic member ‘and associated portions of the
?lament and lamp stem;
FIG. 3 is an enlarged plan view of the ?lament con 65
nection shown in FIG. 2, a part of the bimetallic clamp
being broken away to illustrate the manner in which the
?lament is partly collapsed by and locked within the
clamp;
The aforesaid clamp is ‘formed by bending the free end
of the bimetallic strip back upon itself into a hook of the
proper dimensions that is of U-shaped con?guration when
closed. Since the clamp 28 is vfabricated from bimetallic
material it is heat sensitive and inherently tends to open up
when heated or cooled. It will tend to open when heated
if the end of the bimetal strip is bent toward the metal
layer that has the higher coef?cient of expansion, that is,
if the clamp 28 is formed in a manner such that the higher
coe?’icient metal comprises the inner surface of the clamp.
conversely, if the relationship of the metal layers is re
versed or if the end of the strip is bent in the opposite
direction, then the high expansion metal will form the
outer surface of the clamp and the latter will close tightly
when heated and tend to open up ‘when cooled.
In either
case, the clamp 28 ?exes with changes in temperature
and tends to open up thereby enabling they?lament 12 to
work free and even eventually fall out of the clamp re
sulting in premature failure of the lamp.
The aforesaid di?icu'lty is very conveniently and inex
pensively remedied according to the present invention by
deforming or crimping the clamp 28 either during or after
it is closed around the inserted section of the ?lament [12.
More speci?cally, the clamp .28 (as shown in FIGS. 2 and
3) is deformed to provide an indent or groove 30 in one
FIGS. 4 and 5 are plan views illustrating the initial 70 of its faces and a protuberance or rib 32 in its opposite
face, said groove and rib being aligned one with another
and ?nal steps, respectively, in closing and crimping the
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