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Патент USA US2412826

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Dec. 17, 1946.
E. s. MILLS ET AL
2,412,825 '
TUBULAR LAMP AND HOLDER THEREFIOR
Filed June 30, 1944
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Patented Dec. 17, 1946
‘2,412,826
UNITED STATES PATENT .OFFIC‘E
.
2,412,826
TUBULAR LAMP AND HOLDER THEREFOR
Erwin S. Mills, Cleveland Heights, and Elton A.v
Linsday, Willoughby, Ohio, assignors to Gen
eral Electric Company, a corporation of New '
York
Application June 30, 1944, Serial No. 542,904
13 Claims.
The present invention relates to tubular lamps
and to holders for tubular lamps. It is especially
applicable to tubular lamps intended to operate
at voltages higher than ordinary house lighting
circuit voltage, i. e., 120 volts, or which require
for starting a voltage higher than that required '
by tubular ?uorescent lamps now in use and
which utilize a hot cathode for starting. Such
tubular lamps are ‘termed usually cold cathode
lamps. It is to be understood, however, that the
invention is not limited thereto necessarily but
(Cl. 176-32)
in which is located a terminal screw l6 threaded
into an opening in the end of a contact strip ll
positioned in a groove in the inner surface of
' cover vl4. In opening I2 is a contact carrying ring
I8 of insulating material which is shaped to seat
against shoulder l3 and which has a forwardly
projecting sleeve l9 which is counterbored to pro
vide a shoulder against which rests a flange on
the end of a tubular contact sleeve 20. Sleeve I9
is spaced from the adjacent wall of the opening
in which it is located to form an annular recess
may be used wherever found applicable.
2|. The end of sleeve 20 projects beyond the end
The object of the invention is to provide 'an im
, of insulating sleeve | 9 and is adapted to slide
proved construction and arrangement of tubular
therein. It is biased to a position in which its
lamp and an improved construction and arrange 15 ?anged end is in engagement with the shoulder
ment of holder therefor, and for a consideration
of insulating sleeve I 3 by means of a spring 22,
of what we believe to be novel and our inven
one end of which engages the ?anged end of sleeve
tion, attention is directed to the following speci?
20 and the other. end of which engages a metal
cation and to the claims appended thereto.
eyelet 23 which is attached to disk l8 by a rivet
In the drawing, Fig. 1 is a side elevation of a
24 having a contact head 25 located at the bot
tubular lamp mounted in lamp holders embody
ing our invention; Fig. 2 is a sectional view‘
through-one of the lamp holders and a partial
sectional view through the other with the lamp
'mounted therein; Fig. 3 is a sectional view
through one of the lamp holders with the lamp
removed from the holder, Fig. 4 is a view of a
modi?cation of our lamp holder particularly
adapted for mounting two lamps in line, and Fig.
tom of recess 2|. _ Seated over eyelet 23 is an
insulating disk 26 which assists in holding the
eyelet in place and serves to form an insulating
housing for the eyelet and spring 22. Located
between insulating disk 26 and cover I4 is a sec- ‘
ond spring 21 which at one end is attached to
contact strip II, as is indicated at 28, and at
the other end is attached to ring l8 by a rivet 2.9
which projects-through ring l8 and is provided
5 is a sectional view of another modi?ed form of 30 with a contact head 30 located in recess 2|. Con
tact heads 25 and 30 are located in recess 2| di
lamp holder.
Referring to the drawing, l indicates a tubular
ametrically opposite each other. Sleeve 20 is of
lamp mounted in holders 2, there being a holder
a diameter to receive post 5 and recess 2| is of a
at each end of the lamp. The holders may be
size to receive rim 6.
01' like construction.
35
The lamp holders may be mounted on a sup
Referring particularly to Fig. 3, the lamp com
port 3| by means of screws 32 which pass through
prises a glass tube sealed at its ends and on each
end of which is ?xed an insulating cap 3. In
‘ sulating cap 3 may be ?xed in position on the
suitable openings in the lamp holders.
In use, the two lamp holders are mounted in '
spaced relation to each other on a suitable sup
sealed end of the glass tube in any suitable way. 40 port, being spaced apart a distance, as indicated
It is provided with an annular groove 4 which
in Fig. 1, such that the lamp correctly seats be
de?nes a center post 5 and a sleeve or rim 6.
tween them. To insert a lamp in the lamp hold
On the inner end of cap 3 is a metal plate or disk
ers, one end of the lamp is ?tted in the one
1 provided with a plurality of ?ngers 8 which
project through openings in the bottom wall of
annular recess 4 and have their outer ends bent
inwardly as is indicated at 3 to form lamp con
holder, post 5 being inserted in sleeve 20 and rim
6 being inserted ‘in recess 2|. The lamp is then
pushed into the holder against the action of _
springs 22 and 21. In this connection, it is to be
tacts. . Disk fl is connected with the cathode in
noted that spring 21 is stronger than spring 22 so
side the glass tube. Fixed on the outer end of
that spring 22 compresses a predetermined
rim_6is a metal contact ring “I. It may be ?xed 60 amount before spring 21 yields. When the lamp
in‘ position in any suitable way. It will be under
is inserted, contact ?ngers 3 ?rst engage the
stood that each end of the lamp is provided with
end of contact sleeve 20 after which contact ring
a terminal similar to that just described.
"I engages contact heads 25 and 30. The lamp is
The lamp holder comprises a base ll having an
pushed into the one holder until the other end
axially extending opening l2 which is counter 55 of the lamp clears the other holder after 'which
‘it is placed in line with the second holder and
moved into engagement with it, the lamp being
centered axially by the springs.
When in position, the circuit for the lamp is
from contact screw 16" through contact strip ll‘
bored to provide a shoulder l3. The outer end of
opening I2 is provided with a cover H of insulat
ing material which may be fastened in position
by screws or other suitable fastening devices. The
base and cover are shaped to provide a recess l5 6 O
2,412,826 _
4
to spring 21, through spring 21 to rivet 29 and
contact head 30, through contact ring III to con
tact head 25, through rivet 24 to eyelet 23 and
thence through spring 22 and contact sleeve 20
44 form the contact for the lamp end, being
electrically connected with the lamp electrode
‘ to the contact ?ngers 9 at the one lamp end,
46 corresponding to the contact ring I0 of Figs.
thence through the lamp to the holder at the
other end of the lamp which is similar to that
,just described and through ‘which the current
1 to 3. The holder comprises a base 41 which
is tubular and is counterbored to provide a shoul
in a wall of recess 43 as shown at 45. Fingers
4|. Fixed on the end of cap 42 is a contact ring
der 48 against whichrests a disk 49 of insulating
material held by a spring 50 positioned between
To remove a. lamp from the circuit, the lamp 10 the disk and an end cover 5| held in place in any
is moved axially in one direction until it is free
suitable manner. The terminal for the holder
of the one lamp holder after which it is moved - to which the line circuit is connected is indicated
?ows in a similar way.
to an angle to one side of such lamp holder and
then removed from the other lamp holder. The
clearances between the parts are such as to per
at 52. Integral with disk 49 is a sleeve 53 in
which is located a tubular contact sleeve 54 hav
15 ing an inturned ‘edge against which rests an in
mit of the lamp being inserted into and removed
sulating disk 55 held by a spring 56. Connected
from a lamp holder when at the slight angle re
quired for it to clear the lamp holder at its other
end.
responds to contact 25 of Figs. 1_ to 3, and con
with contact sleeve 54 is a contact 51 which cor
nected with spring 50 is a contact 51“ which cor
When a lamp is removed from'a lamp holder, 20 responds to contact 30 of Figs. 1 to 3. Contacts
‘it will be seen that the circuit is opened at three
51 and 51a are adapted to be bridged by contact
points, namely, at each of the contact heads 25
ring 46 when the lamp end is inserted into the
and 30 and at the contact sleeve, 20; also, in each
holder to bring its contact ?ngers 44 into engage
instance, the circuit is opened in an enclosed
ment with contact sleeve 54.
p
place surrounded by insulation. As a result, a 25
The operation of the arrangement shown in
circuit of relatively high voltage can be inter
Fig. 5 will be clear from the description already
rupted with a minimum of arcing and with no
given, it being understood that the two lamp
visible arc, the arc being entirely con?ned. The
ends are alike and that two holders are suitably
live contact head 30 is well removed from the
mounted in spaced relation to each other a dis
face of the lamp holder, being at the bottom of 30 tance apart such that the lamp ?ts between them.
groove 2|, so that it is not likely to be accidentally
As is the case with springs 22 and 21 of Figs.
contacted by one inserting or removing a lamp.
Also it is to be noted that circuit through the
1 to 3, spring 50 is stronger than spring 55 so
that when a lamp end is inserted in a holder,
lamp is not closed until the lamp is entirely in
spring 56 yields ?rst.
,
‘a
the holder with its ring l0 engaging contact heads 35
In accordance with the provisions of the patent
30‘ and 25. This is of importance from a safety
statutes, we have described the principle of ‘op
standpoint.
,.
Tubular lamps of the type illustrated are well
adapted for use in a series circuit, a number of
lamps being arranged in series in a line and the
circuit being connected to the outer ends of the
I eration of our invention, together with the ap
paratus which we now consider to represent the
best embodiment thereof, but We desire to have
it understood that the apparatus shown is only
illustrative and that the invention may be car
ried out by other means.
‘
two end lamps. In such an installation, .a lamp
holder as shown in Figs. 1 to 3 may be mounted
What we claim as new and desire to secure by
Letters Patent of the United States is:
at the two ends of the string and double lamp
holders, such as that shown in Fig: 4, may be 45
1. In combination, a lamp holder comprising
a base of insulating material having a recess
located at intermediate points. As shown in Fig.
therein, a spring pressed axially movable insulat
4, the double lamp holder comprises a base 33
ing member in the recess carrying a contact mem
corresponding to base H of Figs. 1 to 3 and a
her for engaging a lamp contact, spaced contact
cover .34 corresponding to cover l4 of Figs. 1 to 3.
In the base is a recess 35 in which is mounted 50 elements carried by said member, and a tubular _
lamp having a terminal adapted to be inserted
two oppositely facing structures 36 and 31 each
into said recess, said terminal being provided with
similar to the correspondnig structures shown in
a, lamp contact and having contact means sepa
Figs. 1 to 3 and adapted to receive lamp ends
rate from the lamp contact which connects said
similar to that shown in Figs. 1 to 3. Between
the two structures 36 and 31 is a spring 38 which 55 spaced contact elements in series electrically.
corresponds to the spring 21 of Figs. 1 to 3 and
2. In combination, a lamp holder comprising
a base of insulating material having a recess
through which the electric circuit is completed
therein, a spring pressed axially movable insulat
from one lamp to the next. No terminal for a line
ing member in the recess, contacts carried by said ‘
connection is needed. In substance, the Fig. 4
construction duplicates that shown in Figs. 1 to 3, 60 member comprising a plurality of spaced periph
and its use will be obvious from the description
eral contacts and a central contact, and a tubu
already given in connection with Figs. 1 to 3.
lar lamp having an end adapted to be inserted
In Fig. 5 is shown in sectional view one end of
in said recess and provided with contact means
a lamp and a holder of another modi?cation em
on such end which connects said plurality of
bodying our invention. The tubular glass lamp 65 spaced contacts and said central contact in series.
tube is indicated at 39. It is sealed at each end
3. In combination, a, lamp holder comprising
by a metal end cap 40 to which is attached an
a base of insulating material having a recess
electrode 4| located inside the glass envelope 39.
therein, a spring pressed axiallymo-vable insu~
Attached to the end of lamp tube 33 is an insu
lating member in the recess, contacts carried by
lating cap 42 corresponding to cap 3 of Figs. 1 70 said member comprising a, plurality of spaced
to 3 and provided with walls which de?ne an
peripheral contacts and a central contact sleeve,
annular recess 43. At the inner end of recess
and a tubular lamp having an end adapted to‘ be
43 are contact ?ngers 44 which are integral with
inserted into said recess‘ comprising walls of in
‘end cap 40, project through openings in cap 42
sulating material which de?ne a sleeve having’v
and have their ends crimped over into a groove 75 a contact ring on its end and a recess having a '
2,412,826
6
lamp contact at its inner end, said contact ring
engaging said spaced contacts and said lamp con
means carried by said casing and normally open
tact engaging said sleeve to connect the spaced
contacts and the contact sleeve in series.
4. The combination with a lamp having an
ing the contact member in the recess and said
terminal means, said contact means being closed
circuited contact means for electrically connect
circuited when‘ engaged by the conducting end
insulating wall at its end which de?nes a recess
of a lamp terminal seated on the insulating
and a lamp contact seated within and protected
member.
by the wall of the recess, of a lamp holder having
10. A lamp holder comprising a casing, an in~
a recess into which the lamp end is inserted, a
sulating member movably mounted in said cas
movable member in the lamp holder recess hav 10 ing, said insulating member being provided with
ing a plurality of spaced contacts thereon, and
a recess for receiving a portion of the end ter
means whereby when the lamp end is inserted
minal of a lamp, a contact member in said recess
into the lamp holder recess said spaced contacts
for making electrical connection with a lamp con
are connected in series with each other and with
tact when the lamp terminal engages the recess,
15
the lamp contact.
spring means biasing the movable member into
5. The combination with a. tubular lamp hav
engagement with the lamp terminal and normally
ing an insulating wall at its end which de?nes a
open-circuited contact means including the con
recess and a lamp contact seated within and pro
tact member in the recess for making electrical
tected by the wall of the recess, of a lamp holder
connection therewith, said contact means being
having a recess therein, a member of insulating
closed-circuited upon being engaged by the con
material slidable in the recess, spring means bias
ducting end of a lamp terminal seated on the insu
ing said member outwardly, said member being
lating member.
moved by the lamp end when inserted into the
11. The combination with a lamp having a ter
lamp holder recess, spaced contact members
minal at one end comprising an insulating wall
mounted in the lamp holder recess, and contact
de?ning a recess and a lamp contact seated with
means whereby said spaced contacts are con
in and protected by said recess, of a lamp holder
nected in series with each other and with said
comprising a casing, an insulating member mov
lamp contact when the lamp end is in place in
ably mounted in said casing and being provided
the lamp holder recess.
I
6. A lamp holder comprising walls de?ning a
recess having a shoulder at its forward end, an
insulating member slidably mounted in said re
cess, a spring which biases said member toward
said shoulder, spaced contacts carried by said in- .
.ulating member, one of which is connected to
said spring, a conducting member in the lamp
holder for connection with a, lamp terminal and
being electrically connected to the other contact,
said contacts being adapted to be connected in
series electrically when engaged by the conduct
ing end of a lamp inserted into said recess, and
terminal means connected with said spring.
40
7/. A lamp holder comprising walls de?ning a
recess having a shoulder at its forward end, an
50
nected to‘ the other of said contacts, said con»
tacts being adapted to be connected in series elec
trically with each other when engaged by the ,
lamp holder.
8. A lamp having a wall of insulating mate—
rial at its end shaped to de?ne a recess and a
minal at one end comprising an insulating wall
de?ning a recess and a lamp contact seated with
in and protected by the wall of the recess, of a
ber into engagement with the lamp terminal so
that said contact member is seated in the recess
in the lamp terminal to make an electrical con
lamp terminal, said sleeve being electrically con
conducting end of a lamp is inserted into the
cess for making an electrical connection with the
lamp contact when the lamp terminal engages the
recess, spring means biasing the insulating mem~
her into engagement with the lamp terminal and
meats for making an electrical connection with
said contact member,
12. The combination with a lamp having a ter
lamp holder including a casing, an insulating
member movably mounted in said casing, a con
tact member carried by said insulating member
and spring means biasing said insulating mem
I
insulating member slidably mounted in said re
cess, a spring which biases said member toward
said shoulder, spaced contacts carried by said
insulating member, one of which is connected to
said spring, and a spring pressed sliding terminal
sleeve in the lamp holder for connection with a
with a recess for receiving a portion of ‘the end
terminal of a lamp, a contact member in said re
nection with the lamp contact.
13. A lamp holder comprising a base having
walls de?ning a recess, terminal means on said
base, an insulating member slidably mounted in
said recess, a spring biasing said member toward
one end of the recess to engage a, lamp terminal,
normally open-circuited contact means carried by
said insulating member, one part of said contact
means being electrically connected to said ter
minal means, said insulating member being like
wise provided with a recess for receiving a portion
lamp contact concealed in said recess and being 60 of the lamp terminal, a spring-pressed movable
electrically connected to a conductor in the lamp,
contact member electrically connected to another
and a conducting ring on the outer end of said
part of the contact means and being slidably
wall insulated from the conducting elements of
mounted in the recess of the insulating member
the lamp.
for engaging a lamp contact carried by the lamp
9. A lamp holder comprising a casing, an in
terminal, said contact means being adapted to be
sulating member movably mounted in said casing,
closed-circuited when engaged by the conducting
said insulating member being provided with a
end of a lamp terminal to provide an electrical
recess for receiving a portion of the end terminal
connection between the springand the contact
of a lamp, a contact member in said recess for’
member when a lamp is inserted in the lamp
making an‘electrical connection with a lamp con 70 holder.
‘
tact when the lamp terminal engages the recess,
ERWIN S. MILLS.
spring means biasing the movable member into
ELTON .A. LINSDAY.
engagement with the lamp terminal, terminal
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