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Патент USA US2134574

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Oct. 25, 1938.
Filed Aug. 24, 1937
Emma B Pinkie,
Patented Oct. 25, 1938v
Emma B. Pinkie, East Cleveland, Ohio, assignor
to General Electric Company, a corporation of
New York
Application August 24, 1937, Serial No. 160,621
3' Claims.
My invention relates to electric incandescent
lamps and more particularly to'high wattage
lamps. Still more particularly, my invention
relates to an improved joint between the lamp
?lament and its leading-in conductors.
(Cl. 176-38)
l5-l 5, of molybdenum for example, welded there
to and extending on opposite sides of the tungsten
Heretofore, in high wattage lamps of the type
wherein the ?lament comprises a number of
coiled segments arranged substantially parallel
to each other, it has been the practice to wind
the ?lament with extra coiled segments, at the
ends thereof which were short-circuited by in
serting a mandrel therein and then welded to-
\gether with their mandrels to the leading-in
conductors. Such a joint has the disadvantage
that the mandrel may not make a positive con
tact with some of the turns of the end segment
so that those turns are heated by the current
passing through the lamp thereby increasing the
e?ective length of the ?lament over its designed
length. hMoreover, the welding operation tends
to make the tungsten ?lament brittle so that it
?lament It. The leads are held in rigid spaced
relationship by cross-bars |‘|-l8 of insulating
material, preferably a ceramic material such as
siliminite. The cross-bar I1 is secured to the
leads M-M by short lengths of wire l9—l9
threaded through holes in the ends of the cross
bar and in the leads and welded to the leads.
The cross-bar I8. is secured to the ends of the 10
lead extensions I5-—I5 by similar wires 20-40
welded to said extensions.
The ?lament l6 illustrated in the drawing is'
of the biplane type comprising a plurality of _
parallel coiled segments. joined by upper and 15
lower uncoiled or bight portions 2| and 22 re
spectively, the alternate segments in this case
being located in separate planes so that one-half '
of said segments are in one plane and the other
half of said segments are disposed behind said 20
?rst half in another plane. "The ?lament is sup
ported at the top by support wires 23 having
is liable to break off if the lamp is jarred.
hooked lower ends engaging the upper bights 2|
One of the objects of‘my invention is to pro
and secured at their upper ends to the cross-bar
vide an improved form of joint betweenv the ?la
H. The lower bights 22 are rigidly secured, pref- 25
by welding, to the upper ends of anchor
object is to provide a joint in which the end seg
wires 24, the lower ends of which are rigidly se
ments of the ?lament are effectively short-cir
cuited. Still another object is to greatly increase cured to an insulating bridge member 25 which
the strength of the joint and to provide a good may be made of zircon. The said anchors may
be embedded in the bridge25. Each of'lgulde 30
30 mechanical and electrical connection of the ?la
wires 26—26 has one end secured to the bridge
ment to the leading-in conductors.
25 and the other end loosely coiled around. a lead
Further objects and advantages of my inven
tion will appear from‘the following description of extension l5 so as to be freely slidable thereon’
a species thereof and from the drawing in which so that the ?lament I6 is free to expand in a
longitudinal direction‘and the bridge 25 moves
35 Fig. 1 is an elevation of one form of incandescent therewith but is prevented from rotatingby the
lamp embodying my invention; Fig. 2 is an eleva
said guide wires 26 thereby preventing the seg
tion, partly in section and on an enlarged scale, ments of the ?lament from twisting. The bridge_
of a portion of the ?lament joint; and Fig. 3 25 is further guided by a wire 21 secured thereto
is a section along the line 3-3 of Fig. 1 showing and extending through a hole in the cross-bar l8.
40 a portion of the ?lament and its supporting struc
Each end of the ?lament I6 is wound with a
Referring to the drawing, the lamp shown coiled segment 28 (Fig. 2) over which is screwed
therein comprises a glass bulb l0 having a base a coil 29, preferably of tungsten wire, of substan»
construction of the type shown and claimed in tially the same length as the said segment 28 to
short-circuit the said segment. The coil 29 is 45
States Patents Nos. 1,967,852 and 2,069,
638, D. K. Wright, and consisting of a pressed of the same pitch as the segment 28 and prefer
glass cup portion ll having tubular bosses l2—-l2 ably is‘made of a wire of slightly smaller diam
thereon to which are sealed metal thimbles eter. A conductive support or mandrel 30 ex
l3-|3 which serve for mounting the lamp ‘and tends through the segment 28 which is securely
conducting current thereto. Channel-shaped - held between a hooked end 3| of the mandrel 50
metal supports or leading-in conductors l4—l4 and the cross-bar H, the said mandrel extending
are secured at their ends within the thimbles through a holein'said cross-bar and being se
|3—-l3 and extend into the bulb Ill. The leads
l4-I4 may be made of nickel-plated steel and
55 may be provided with rod or wire, end portions
cured, preferably by welding, to the lead It. The
hook 3| on the end of mandrel 30 may be omitted -
if desired sincethe segment 28 grips the’ mandrel 65
quite tightly. Such a joint adds greatly to the having a coiled end portion, a coil screwed over
strength of the lamp, provides a good mechanical said coiled end portion of said ?lament and short
and electrical connection of the ?lament to the circuiting the turns thereof, and a conductive
leads and assures the short-circuiting of all 01' mandrel in contact with and extending through
the turns in the ?lament end segments 28.
said coiled end portion or said ?lament and 5
What I claim as new and desire to secure by through Said cross-bar $0 One 01’ Said leads. Said
Letters Patent of the United states is;
?lament end portion and the coil thereon being
1. In an incandescent lamp, the combination securely held between said cross-bar and the end
of a conductive lead, a ?lament having a coiled
end portion, a coil screwed over said coiled end
of said mandrel-
3- In an incandescent lamp. the combination 10
portion of said ?lament and short-clrcuiting the
0f a ?lament, a‘conductive support for Supplying
turns thereof, and a conductive mandrel in contact with and extending through said coiled end
current to said ?lament, said ?lament having a
coiled end portion surrounding and making elec
trical contact with said supportI and a coil screwed
over said coiled end portion of said ?lament and 15
portion of said ?lament and secured to said con-
ductive lead at a point removed from‘said coils.
2. In an incandescent lamp, the combination
01’ a pair of spaced conductive leads, an insulating
cross-bar extending between said leads, a ?lament
short-circuiting the turns thereoi’.
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