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7
June 7, 1938,
M. EQMOGOWAN
’
_
2,119,681
CEMENTLESS BASE FOR INCANDESCENT LAMPS
Filed Dec. 21, 1935
2 Sheets-Sheét l
v
ATTORN
June 7,_ 1938.
—
_
M. E. MQGOWAN
-
2,119,681
CEMENTLESS BASE FOR INCANDESCENT LAMPS
Filed 1150. 2-1, 1935
'
2 Sheets-Sheet 2‘
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Patented June 7, _1 938
_ 2,119,681
‘UNITED "STATES PATENT OFFICE
Michael E. McGowan, Bloom?eld, N. 1., assign
or, by mesne assignments, ‘to Westinghouse
Electric and Manufacturing Company, East
Pittsburgh, Pa., a corporation of Pennsylvania
.
Application December 21, 1935, Serial No.‘55,520
5‘ Claims. (Cl. 176—32)
This invention relates to the manufacture of
electrical devices such as inca'ndenscent electric
lamps in which a base is secured to a lamp'blllb
and more particularly to a bulb and base so con
structed as to permit the base to be secured to
the bulb by mechanical means.
»
In the manufacture of electrical devices, such
for example as incandescent electric lamps, it
is the practice to provide the lamp with a base in
10 the form of a threaded metallic shell or cap hav
ing one end open to receive the end or neck por
tion of a glass bulb. Bases of the above char
acter' are usually secured to the bulb by means
of a quantity of cement which is deposited in the
15 base, after which the bulb and base are disposed
in the desired relation and the cement is sub
jected to a baking operation to harden and ?rmly
secure the bulb and base in ?xed relation.
The above constructionha's been extensively
stress, resulting in cracks causing leaks sincethe
bulb is evacuated to a relatively high degree.
In my co-pending application Serial No. 55,519
filed December 21, 1935, entitled “Method of seal
ing-in and molding lamp bulbs” and assigned
to the present ‘assignee, a method is shown and
described wherein a bulb neck ‘is formed with an
annular shoulder which provides a surface in a
plane substantially transverse to the longitudinal
axis of the bulb.
‘
'
'
10
advantage of the discovery that the bulb neck
may be formed with an angular shoulder, and
utilize the shoulder to seat the upper edge of a
base. This gives the base a ?xed position with 15
respect to the bulb and in conjunction therewith
I provide means for locking the base with its
upper edge against the shoulder, and for secur
In accordance with the present invention I take
20 used but certain disadvantages attend this mode
ing the base against relative rotary movement. -
of manufacture since it is time consuming, rela
tively expensive, and involves a heat-treating
vention to provide a simple and e?ectlve me
operation.
’
Heretof'ore many attempts have been made to
25 provide a mechanically secured base but owing to
the difficulty in providing a lamp bulb of such
construction as to include the necessary ele
ments for cooperating with means on the base,
it has been di?icult, if not impractical, to fur
30 nish a suitable mechanically secured base.
This
is especially true when applied to lamps of the
popular standard types in which case the base
must be exactly similar to a standard base which
is secured to. the bulb by cement.
35
A mechanically attached base must be secured
against endwise removal; it must be held against
.rotary or lateral movement; and must have a
tight and preferably a water-sealed ?t against
the bulb.
40
.
.
Heretofore when making a mechanical base
the bulb neck was formed with indentations or
with specially formed surfaces to receive collars
over which the base was forced and held against
It is, therefore, an object of the present in 20
chanicallysecured base.
.
’
Another object" of the invention is to provide
a mechanically secured base in the form of the
standard threaded shell free'from rotary or lat 25
eral movement relative to the bulb neck.
A- further object of the invention is to provide
a lamp bulb with the neck portion so formed as
to cooperate with mechanical means for securing I
a base to. the bulb neck.
'
A still further object of the invention-is to
provide a lamp bulb having what may be termed
30
a straight shoulder (as disting?uishedfrom ‘a »
rounded annular), and a base with its upper edge
seated against the shoulder. -
'
,
5
Other objects and advantages of the invention
will be more clearly understood by reference to
the following description together with the ac
companying drawings in which:
Fig. 1 is a side elevational view of -a bulb with"
a base attached in accordance with the present
invention;
'
35
l
, Fig. 2 is an enlarged detail view of the base and
removal. In spite of the various means employed
bulb neck shown in vertical cross section;- '
to provide a mechanically secured base without
Fig. 3 is a view similar to Fig. 2, but shows 45
a section taken through the base at another point
some play or looseness, in so far as I am aware.
to show locking means;
4GI to hold'the base in place, it has been impossible
This wasdue to the fact that when ‘shaping the
- bulb neck to receive a base the base lacked the
necessary seating surface on the bulb owing to
,
.i
Fig. 4 is a view of the lower end of the bulb
neck showing depressions and slot to receive
holding members;
, .
Fig. 5 is a view taken on line V-V in Fig. 4;
the long established practice in glass working.
Fig. 6.is a view of a base partly broken away
which taught that only rounded corners‘ were
practical when making a bulb. It was believed to show holding means extending from the in
55 that any sharp corners would result in internal
/ ner wall of the base;
‘
,
-
50
,
Fig. 7 is a view, taken on line VII-VII in Fig. 6; 55
2
2,119,681
- Fig. 8 is a side elevational view of a bulb with
a base constructed in accordance with the present
invention, but showing a modi?ed form of the
securing or holding means;
Fig. 9 is an enlarged detail view of the base
and the lower end of the bulb shown in Fig. 8,
partly in vertical cross section;
'
Fig. 10 is a detail view of the lower end of
the bulb neck shaped to receive the modi?ed
10 holding means;
Fig. 11 is a view taken on line XI-Xl in Fig.
10;
,
-
.Fig. 12 showsthe base with holding means to
securethe base to the bulb neck shown in Fig.
15 10; and
Fig. 13 is a view taken 1m line xm-xrn in
Fig. 12.
Although the present invention may be em
ployed to mechanically secure a base to any type
20 of lamp bulb or similar device, it is shown and de
scribed as applied to an incandescent lamp bulb
in having a neck portion Ii and the usual stem
l2 with an arbor 13 to support a ?lament l4’. The
?lament is provided with conductors l4 and i5
'25 which are sealed. in a press l1 and extend through
the stem tube l2 and terminate in the form of
.?exible lead wires l8 and I9. The-bulb may b
30
Although the lips may be positioned to snap
into the indentations when the base is in place,
it has been found practical to leave the lips ?ush
with the wall of the base and after the base has
been positioned the lips may be bent inwardly and
?rmly pressed into the indented surface of the
bulb neck. These indentations may be formed to
almost exactly ?t the lips so that when the lips
are pressed into their locking positions they oc
cupy the entire space provided by the indenta
tions and thus ?rmly hold the base against any
relative rotary movement. It will be understood
that the. slots 29 serve to align the base so that
the lips will register with the indentations.
It will be noted that lips hold the edge- 20
tightly against the‘shoulder surface 22' and it
has been found that by making the plug portion
21 of the bulb neck a tight ?t and by reason of
the ?rm contact between the upper edge of the
base and the shoulder, the base is sealed to the '
extent that moisture is prevented from reaching
the lower inside,portion of the base. It has been
found, if the plug portion of the neck is dipped
in a solution of a lacquer just before the base is
applied, that an exceptionally effective -'seal is
provided.
.
.
_
The present construction, however, makes it
possible to bring the shell and bulb neck into such
provided with the usual exhaust tub'e 2|.
- '
In accordance with the present invention the _ intimate relation that a seal- is-eiiected for all
bulb neck is formed with an annular shoulder 22 practical purposes. It will be understood, al- "
which provides a ?at surface 22' disposed in a
plane substantially transverse to the longitudinal
axis of the bulb. This surface provides a seat for
the upper edge 20 of a base 23. The base may bev
of the usual screw thread type for standard sock
ets. As shown, the base comprises a tubular me
tallic shell 24 closed at one end by an insulative
web 25 of glass which carries a bottom contact
member 26. The lead wire l9 may bev electrically
connected to the contact 26 and lead l8 may be
electrically connected to the shell 24.
The bulb neck in addition to having the ?at
vshoulder is formed to provide a cylindrical plug
or extension 21 of a diameter so proportioned that
the plug ?rmly ?ts the inside surface of the shell
24. It will be noted that the base shown is of the
screw threaded type and that the upper end of
the base is in the form of a collar 26' and that
the plug 21 is provided with an annular surface
50 21' which ?ts the collar. The lower end 28' of
the plug 21 is of a reduced diameter to fit the
inner surface 30' of the threads. Thus the base
when ?tted over the plug is held in alignment
with the longitudinal axis of the bulb by reason
of its contact with the plug.
_ Around the annular surface 21'» of the plug are,
in the present embodiment,.provided generally
triangular indentations 23 and generally rectan
gular slots 29. vThe indentations receive lips 39
which in' the present embodiment are generally
triangular and may be formed, and extended in
wardly, from the wall of the shell, and the slots
29 receive bosses or wards 32 which may be formed
from the shell to correspond with the receiving
65 slots 29 and extended inwardly. The lips and the
wards may be so formed as to be resilient or
spring-like.
‘
-
When a base is, to be ‘applied to a bulb-neck,
the base is adjusted until the wards slide into
the slots and as the base is forced over the end
of the bulb neck to bring the edge 29 thereof into
contact with the shoulder 22, the lips enterv the
- indentations 28 and lock the base against end
though the lips are shown of angular form, that
any shape of lip or securing projection will an
swer the purpose. For example, the indentations
may be in the form of circular recesses and after
the’ base is in position on the bulb neck the ma 35
terial of the base, which is usually soft brass,
may be forced into the recesses.
, .
‘This may be done by piercing the metal and
forcing in a lip, or the metalmay be forced into
the recess without breaking the wall of the shell.
The ward may also be formed from theshell with
out breaking theshellwall;
.
.
,
_
-
Figs. 8 to 13 show a’ base having oppositely
directed lips 33 and 34 to enter depressions 35
and 38 respectively, on the bulb neck. In this
case the base is applied to the bulb neck and ad
iusted until the lips snap into the depressions.
The lips 33 lock the base against endwise move
ment and the lips 34 hold it "against relative
rotary movement. In this instance the depres
sions 35 and 36 are all generally rectangular, the
?rst set elongated parallel to the axis of the bulb
neck and the other circumferentially.
The present invention provides a simple form
of mechanically secured base and, as will be noted,
the bulb and base cooperate to make the mechan
ical attachment possible. It is vitally important
in a device of this kind to be able to prevent lost
, motion and particularly a lateral or sidewise
movement of the base relative to the bulb neck. 6
The di?iculty has been in holding the metallic
shell against movement relative to the bulb neck.
This has been a‘ perplexing problem for many
years.
.,
The advantages of a mechanically attached
base were well recognized and many ‘attempts
were made to produce a mechanically secured base
to meet practical requirements. The bulb neck,
however, presented a hard smooth surface which,
owing to the character of the material. could not
be gripped too tightly without cracking, making
it dimcult to effectively secure a base without,
some means of holding the base against sidewise
movement. Heretofore ‘when the bulb neck was
wise movement. The wards 32 in the slots 29
75 hold the base against relative rotary movement. provided with a rounded shoulder the upper edge
2,11e,ca1
of the base was free to rock about any means
provided to hold it against endwise movement. In
such cases, although it was possible to secure the
base to the bulb, the slight play which could not
beavoided resulted in a loose base. '
I
In accordance with the present invention the
edge of the base is seated against an abutment or
' seat which extends transverse to the axis of the .
- base and it is only necessary to provide holding
10 means to prevent removal of the base and hold it
3 .
a portion struck therefrom and ?tting in said
?rst mentioned slot to prevent relative rotation
between said base and bulb, and another portion
struck inward therefrom and ?tting in said cir
cumferentially extending slot to prevent relative
axial movement between said base and bulb, and
the edge of said base engaging said shoulder.
3. An electrical device comprising a bulb hav
ing va neck terminating in a generally cylindrical
reduced portion stepped to provide a generally cy 10
lindrical further reduced end portion, a- slot in
dented in the outer surface of‘ said reduced por
tion and extending generally parallel to the axis
.in contact with the abutment which resists move
ment of the base equally at all points around its
edge. By reason of the annular abutment the
bulb neck may, as shown, be of cylindrical form to of said bulb, another indented slot, spaced from
'15 snugly ?t the base so that when the base is slid
said ?rst mentioned slot and extending circum 15
over the bulb, neck and against the abutment, . ferentially with'respect to said end portion, and a
it is held in the absence of play and the wards,
lips and other deformations that may be made,
merely serve to lock the base in place, keeping it
20 against the abutment and preventing relative ro-'
tary movement.
.
‘
A base constructed in accordance with‘the pres
ent invention is easily applied and of relatively
low cost, and in practice it has been found to hold
25 as well as when applied by the more laborious and
costly operation of cementing, if not better. -
Although a preferred embodiment of- the in
vention is shown and described herein, it is to be
understood that modi?cations may be made
30 therein without departing from the spirit and
scope of the invention asv de?ned by the ap
pended claims.
'
What is claimed:
_
,
1. An electrical device‘ comprising a bulb hav
35 ing a neck terminating in a generally cylindrical
reduced end portion forming a flat annular shoul
der with said neck, a slot indented in the outer
tubular metallic screw-threaded base closely ?t
ting the reduced portion of said neck, said base '
having a plain portion with a portion struck
therefrom and ?tting in said ?rst mentioned slot
to prevent relative rotation between said base and
bulb, and another portion struck inward there
from and ?tting in said circumferentially ex-'
tending slot to prevent relative axial movement
between said base and bulb. '
'
25
4. An electrical device comprising a bulb-hav
ing a neck terminating in a generally cylindrical
reduced portion stepped to provide a generally
cylindrical further reduced end portion, a plu
rality of slots indented in the outer surface of said 30
reduced portion and extending generally paral
lel to the axis of said bulb and spaced around
the periphery of said reduced_portion, a plu
rality of generally triangular indentations dis
posed between said slots around the periphery ofv
said reduced portion, ‘ and a tubular metallic
screw-threaded base closely ?tting over the re
surface of said end portion and extending gener- - duced portion of said neck, said base having a '
ally parallel to the axis of said bulb, another in
dented slot, spaced from said ?rst mentioned slot
and extending circumferentially with respect to
saidend portion, and a tubular ‘metallic screw
threaded base closely ?tting the reduced end por
tion of said neck, said base having a plain ‘por
tion with a portion struck therefrom and ?tting
in said ?rst mentioned slot to prevent relative
rotation between said base and bulb, and'an
other portion struck inward therefrom and ?t
ting in said circumferentially extending slot to
prevent relative axial movement between said
base and bulb, the edge of said base engaging said
shoulder, and the outer end of said reduced por
tionv being restricted sufficiently to ?t the inner
surface of the threads on said base.
55
\
2. An electrical device comprising a bulb hav
, ing a neck terminating in a generally cylindri
cal reduced portion forming a ?at annular shoul
der with saidneck and stepped to provide a gen
erally cylindrical further reduced’- end portion, a
slot indented in the outer surface of said reduced
portion‘ and extending generally parallel ‘to the
axis of said bulb, another indented slot spaced
from said ?rst mentioned slot and extending cir—
cumferentially with respect to said reduced por
.65 tion, and a tubular metallic screw-threaded base
closely ?tting the reduced and end portions of
said neck, ‘said base having a plain portion with
plain portion with’wards struck therefrom and
each ?tting in one of said slots to prevent rela
tive rotation between said base and‘ bulb, and
lips struck inward from said plain portion and
?tting said triangular indentations to prevent
relative axial movement between \said base and
bulb.
‘
5. An electrical device comprising a bulb hav
ing a neck terminating in a generally vcylindri
cal reduced portion stepped to provide a gener- - -
ally cylindrical further vreduced end portion, a
plurality of rectangular slots indented in the out 60
er surface of said reduced portion and extending ‘
generally parallel to the‘axis of said bulb, other
‘generally rectangular slots indented in the outer
surface of said reduced portion, disposed between
said ?rst mentioned slots, and extending circum
ferentially around said end portion, and a tubu
lar metallic screw-threaded base ?tting over the
reduced portion of said neck, said base having a
plain portion with wards struck therefrom and
?tting said ?rst mentioned slots to prevent rela 60
tive rotation between said base and bulb, and
other wards extending approximately at right ‘
angles to said ?rst mentioned wards and ?tting
in said circumferentially extending slots to pre
vent relative axial movement between said base
and bulb.
' MICHAEL E. MCGOWAN. >
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