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Sept. 24, 19460
H. K. RlcHARbsoN
Filed uai-ch 25, 1937
MM; W»
Patented Sept. 24, 1946
Henry K. Richardson, Bloom?eld, N. l, assignor
to Westinghouse E
lectric Corporation, East
Pittsburgh, Pa., a corporation of Pennsylvania
Application March 25, 1937, Serial No. 132,956
14 Claims.
This invention relates to the manufacture of
electrical devices such as highewa-ttage incan
descent electric lamps, power tubes, recti?ers, or
other devices where metal contact elements are
employed for the passage of heavy currents, and
is a continuation~in-part of my application Serial
No. 692,587, ?led October 7, 1933, now Patent No.
(01. 176-32)
paratively heavy preformed base portion ill of
glass or other vitreous material is provided. This
cup comprises a bottom wall, a peripheral flange,
and is provided with contacts or thimbles i i. It
is sealed along edge E2 to a bulb l indicated in
dotted lines, and adapted to enclose the light
source or other energy-translating unit. The cup
may be provided with an exhaust tube ill, through
When making a high-wattage incandescent
electric lamp, as shown for example, in the 10 which the bulb may be evacuated in the usual
manner. Usually the cup is provided with rigid
lviassie Patent No. 1,869,572, or the Howe Patent
metal support members or lead-in conductors ill’,
N 0. 2,010,084, it is desirable from an operative and
to which electrodes or resistance elements such
practical standpoint to provide relatively large
2,075,057, dated March 30, 1937
as tungsten ?laments, which
be like the ?la
metallic contact pins and considerable di?iculty
has heretofore been encountered in sealing the 15 nient l and associated support members 2 and 3
of the Massie patent, or the ?lament 2 and asso
pins in the glass wall of the bulb which forms
part of the device.
It has been proposed to provide tubular con
tacts, termed thinible seals, preferably closed at
one end and having the opposite end provided
with a thin-edged funnel shaped opening. These
pins are sealed to the ‘wall of a bulb by ?rst bead
ing the edges of the open ends with glass and
then heating by means of gas ?ames to seal the
head to the edges of suitably disposed openings.
ciated support members 3 and 4 of the Howe
patent, above referred to, are secured. The cup
may, therefore, be constructed to include the in
ternal structure or operating elements of the de
vice and aconvenient method is, therefore, had
for properly mounting the elements and for lo
cating them within the bulb. When the cup is
fused to the bulb the device is complete for the
sealing-off operation.
As above mentioned, it has heretofore been pro
It is an object of the present invention to pro .25
posed to provide the metal thimbles with glass
vide an improved form of base for a vacuum
layers or beads to facilitate their gas-tight union
with the bulb wall. In the present case, however,
Another object of the invention is to provide
this beading is dispensed with.
a base with contact members held by internal
The wall 55 of the cup is provided with aper
tures is of any desired number. rl‘he selected
A further object of the invention is to provide
embodiment of the invention includes two such
a base with means for projecting into contact
apertures, since two contacts are to be used.
members for consolidation therewith to hold said
Each aperture is provided with an outwardly ex
members rigid,
35 tending tapered hollow boss or extension ll. This
Other objects and advantages of the invention
boss is so proportioned that it just enters and en
will be more clearly understood from the follow
gages the inner surface adjacent to a tapered edge
ing description together with the accompanying
253 of the enlarged portion lb of a thim'ble El.
drawing in which,
This enlarged portion of the thimble forms a sur
Fig. 1 shows a portion of a bulb, partly in sec
rounding flared skirt and is integral with a tubu
tion, with contacts or thirnbles sealed therein in
lar cylindrical portion iii which serves as the con
accordance with the present invention;
tact proper and enters a socket for the passage
Fig. 2 shows apparatus for holding a thimble in
electrical energy through the device when in
position to be sealed to a bulb wall and means for
operation. The side of each boss ll’ is preferably
heating the glass;
about as thick as the wall l5, so that the hole
Fig. 3 is a view similar to Fig. 2, but shows the
glass after it has been softened and sealed to
the edge of a contact member; and
Fig. 4 is a modi?ed form of apparatus for seal
ing a thimble to a bulb, in which the heater is
disposed within the end of the thimble, and in
which the thimble connects with the bulb in a
through the enlarged portion of the thimble, de
?ned by the tapered edge ?él, is restricted, as
shown, to correspond approximately with the in
terior of the tubular cylindrical portion ill, where
by a strong connection with the thimble is pro
vided, while allowing for the reception of a lead»
in wire l5’. That portion of each conductor ll’l’,
adjacent the connection with its thimble ll,
forms, with said thimble, a rigid metal contact
slightly diiferent way.
In devices of the character to which the present
invention is most applicable, a cup-shaped com 55
terminal extending through its receiving hole
edge embedded or sealed in the wall 15' thereof,
I6. rI‘he slrirt portion 18, because of its thin~
as in the embodiment of Figs. 1, 2, and 3, the boss
ness, as illustrated, has elastic properties, per
3! for that purpose extending from said wall like
mitting slight relative rocking of the contact
the boss I‘! of Figs. 1, 2, and 3.
member II with respect to the base ID.
It will also be understood that, although the
A support or socket 2! having apertures or
embodiment of Figs. 1, 2, and 3 shows the en
pockets 22 may be provided to hold each contact
larged portion l8 of a thimble ll secured to the
element in position so that the boss 11 may be
wall IS with its edge portion 20 embedded or
positioned, as shown in Fig. 2. In accordance
sealed therein, yet the Wall 15 may have its boss
with the present invention a local heat zone is
i1 formed like the boss 3| of Fig. 4; that is, se
provided to soften the wall !5 and glass boss I1
cured to it by a conical portion, and the sharp or
and cause the latter to wet or stick to the edge
tapering edge portion 20 need only be secured to
23 of the enlarged portion iii of the thimble,
the outer surface of the boss I1 and not embed
while at the same time softening the wall l5 suf
ded or sealed in the wall [5.
ficiently to allow the edge 20 to be embedded or
Whether or not a connection as shown in Figs.
sealed therein, as illustrated in Fig. 3. In the
1, 2, and 3 or as shown in Fig. 4, is employed, may
present construction a heat zone is created‘ by
depend on the kind of glass used. If Pyrex (C.
means of a resistance element 22' in the form' of
Gui-‘7741) is employed, in which the coefficient of
a helical coil which surrounds the tapered edge
expansion between 20 and 320° C. is about
2i! and the contacting glass boss H. An insu
lative baffle 23 may be provided to con?ne the H
32><10—", it is desirable to employ the connec
tion illustrated in Figs. 1, 2, and 3, in order to
heat for the purpose intended when current
avoid cracks due to shearing action between the
passes through the coil. Any suitable source of
sides oi‘ the enlarged portion 18 of the thimble
current supply may be used and a switch 24 may
l l and the boss l1. However, when No. 705 glass
be provided to open and close a circuit including
is employed, in which the coefficient of expansion
conductors 25 and ‘26, attached to opposite ends
is about 46><10—7. either type of connection may
of the coil or resistance element 22'. Some al»
be employed without any trouble.
ternative source of heat may, of course, be em
Although preferred embodiments of the inven
ployed, for example, an oxy-hydrogen ?ame.
tion are shown and described herein, it is to be
When the respective parts are in position and
understood that modi?cations may be made
the glass boss has been heated to a sufliciently .
therein without departing from the spirit and
plastic state, a member 21 is moved downwardly
scope of the invention, as set forth in the ap
against the inner edge of the aperture l8 to firm
1y press the glass against the edge 20, so that the
I claim:
sharp edge of the enlarged thimble portion en
1. An electrical device comprising a glass ves
gages the outer surface of the wall I5, is embed 05 sel, an aperture leading from said vessel and de
ded therein, and effects a gas-tight seal.
fined by a hollow tapered boss extending from a
The member 21 is disposed with its vertical axis
wall thereof, and a metal contact member secured
in alignment with the vertical axis of the con
to said boss, said member comprising a hollow,
tact member so that as pressure is applied to the
cylindrical portion closed at its outer end, shoul
member the contact pin is aligned with the axial 40 dered at its inner end, serving as the contact
line of the tubular boss or extension ll. Thus,
proper, and adapted to receive a lead-in wire
as heat is applied to soften the glass to permit
from said vessel through said aperture, and an
it to flow onto the inner surface of the contact,
enlarged portion extending toward said vessel
the member 21, in conjunction with the support
from said shouldered portion, the sides of said
for the contact pin, maintains the proper perpen
enlarged portion decreasing in thickness from
dicular relation of the pin with the Wall [5.
said shouldered portion to a sharp edge, said en
In cases where exceptionally large contact
larged portion flaring toward said vessel, ?tting
members are employed, a heater element 21’ (see
over said tapered boss and sealed only to the ex
Fig. 4) may be disposed within the con?nes of
terior thereof, the sharp edge of said enlarged
an edge 28 of a thimble 29 and a glass boss 35. SU
portion engaging said wall which is continued
In this case a heater coil 32 may be carried on a
outwardly therefrom at an angle to said contact
sleeve 33, one end 34 being electrically connected
member so as to effect a gas-tight seal.
to the sleeve. The other end 35 of the coil may
2. An electrical device comprising a glass ves
sel, tubular bosses extending from a wall of said
be connected to a conductive member 36 suitably
insulated from the sleeve 33. Electrical energy
vessel. and cylindrical metal contact members
having shoulders from which enlarged ?aring
portions extend into engagement with said wall
may be supplied from any suitable source and. a
switch 3'1 may be employed to control a flow of
current through conductors 38 and 39, connected
and are disposed around and sealed to the ex
to the sleeve 33 and member 35, respectively.
When current flows through the heater element, 60 terior of said bosses to effect a gas-tight seal.
3. An electrical device comprising a glass ves
the glass boss 3| is rendered plastic and wets the
tubular bosses extending from a wall of said
edge 28 and a gas-tight seal is produced. Obvi
vessel, and tubular contact members having
ously, if found desirable, the structure shown in
closed outer ends, intermediate shoulders, and
Fig. 4 may be provided with an external heater
coil to provide a surrounding zone of heat to fa C) O enlarged portions flaring toward said vessel, the
walls of said enlarged portions tapering to thin
cilitate the sealing operation.
edges, ?tting over said bosses, extending to said
In the present embodiment, the boss 3! does
wall, and sealed to the outer surfaces of said
not extend directly from the normally horizontal
wall portion l5’, but is connected thereto by an
4. A base for a lamp bulb comprising a glass
approximately conical portion 40, and the edge 70 cup de?ned by a bottom wall and peripheral
28 of the thimble 29 is not embedded in the wall
flange, tapered hollow extensions on said wall,
l5’, as in the previous embodiment, but merely
and tubular metal contact members having
extends to the conical portion 40. However, it
shoulders and ?aring enlarged portions extend
will be understood that, if desired, a large thim
ing from said shoulders, said enlarged portions
ble 29 may be secured to a bulb It)’ by having its 75
?tting said tapered extensions, engaging said
wall, and sealed to the outer surfaces of said ex
ders from which enlarged ?aring sharp portions
extend into engagement with said wall, and are
disposed with said sharp portions sealed around
the apertures to effect gas-tight union.
10. An electrical device comprising a glass ves
sel, a Wall of said vessel having apertures and tu
5. An electrical device having a vitreous wall
provided with apertured portions, and metal con
tact members, each extending in a direction sub
stantially normal to the plane of an apertured
portion, comprising a contact proper and a skirt
bular contact members having closed outer ends,
intermediate shoulders, and enlarged portions
portion extending therefrom, ?aring toward said
wall, and having a sharp edge portion surround
10 ?aring toward said vessel, the walls of said en
larged portions tapering to thin edges sealed to
and with the sharp edge portion sealed thereto
the outer surface of said vessel around the aper
to e?‘ect a gas-tight union.
6. An electrical device having a vitreous wall
11. A base for a lamp comprising a glass cup
de?ned by a bottom wall and a peripheral ?ange,
apertures and sealed to said wall.
12. A metal contact terminal device for a bulb—
wall base comprising a contact proper, a lead-in
conductor portion adapted to extend through an
aperture in said base, and a ?ared skirt taper
sel, a wall of
between said device and base.
13. An electrical energy translation device
comprising a vitreous envelope having openings
therein, a plurality of metal contact terminals
each comprising lead-in conductor portions pass
ing through one of said openings, a contact prop
a ?ared skirt extending therefrom, each
rigidity to support theterminals
device. having su?icient
14. An electrical device comprising a vitreous
vessel, a Wall of said vessel being formed with
9. An electrical device comprising a, glass ves
sel, a wall of said vessel having apertures, and
cylindrical metal contact members having shoul- -
the sharp-edge
a gas-tight seal.
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