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Патент USA US2405789

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Aug. 13, 1946.
‘ I
J. H. HOMRIGHOUS
I
2,405,789
MULTIFILAMENT LAMP
Original 'Filed Aug. 22. 1942
FIGII
IN VEN TOR.
w
Patented Aug. 13, 1946
2,405,789
UNITED STATES PATENT OFFICE
2,405,789
MULTIFILAMEN T LAMP
John H. Homrighous, Oak Park, Ill.
Original application August 22, 1942, Serial No.
455,747. Divided and this application Novem
ber 1, 1943, Serial No. 508,453
13 Claims. (Cl. 315—-65)
1
This application is a division of application
Serial Number 455,747, ?led August 22, 1942.
This invention relates in general to improve—
ments in electric lamps, and more particularly to
lamps having a plurality of heating units or ?la
ments.
One of the main objects of this invention is to
provide means for prolonging the useful life of
2
held in the position shown in Figure l by the com
bination of the link l6 secured to the stabilizing
bar M with a fuse metal link connector ll, ref
erence to Figure 4, joining it with the bar l3
which in turn is secured to the ceramic or porce
lain plate IS. The spring 28 secured to the disk
6 and to the plate I9 is for rotating the disks 5
and. 6 in a clockwise direction when the fuse link
electric lamp bulbs.
ii‘ is broken.
Another object of this invention is the provision 10
The porcelain plate I9 near the bottom of the
of switching mechanism inside the evacuated en
bulb has two bimetalic strips 2| and 22 rigidly
velope for automatically changing the ?laments
secured thereto and having their upper contact
or the heating units when one is burned out.
ing extremities 23 and 24 extending in quadrants
Several multi ?lament lamps have been devised,
about the stem 4 shown in Figure 3. These mov
but in none of these is the switching mechanism 15 able members or bimetallic strips are provided
rotatably mounted in the evacuated bulb and con
with coils of resistance wire 25 and 25 to heat
trolled by bimetallic strips or members supported
the bimetal to cause them to ?ex in a counter
inside the tube which are ?exed into contact when
clockwise direction. The plate is also provided
a ?lament is disrupted.
'
with a contact spring 2? for contacting the pins
These and other objects and. advantages will 20 12 and I3.
be apparent from the following detailed descrip~
The operation of the switching mechanism
tion, reference being had to the accompanying
shown in Figures 1 to 4 is as follows, reference
drawing in which:
being had to Figure 5. The source of current sup
Figure l is a side elevation partially in section
ply may be connected through conductor 23, link
of an illuminating bulb with ?lament switching 25 l6, coil 26, connecting bar ll, pin 7, heating unit
mechanism.
9, pin l2, wiping contact spring 21, and conductor
Figure 2 is a top detail view of the rotary
29, leading to the source of power supply. The
switching mechanism in Figure 1.
heating unit 9 in series with coil 25 will now be
Figure 3 is a detail view of mechanism taken on
energized in multiple with the heating coil 25.
line 3—3 in Figure 1.
‘ The heating coils 25 and 26 will cause the bi
Figure 4 is-a detail end view of rotary switch
metallic strips 2! and 22 to ?ex in a counter clock
mechanism taken in the direction of the arrow
4 in Figure 2 including fragmentary portions of
brush and Support.
Figure 5 is a schematic of the circuit used with
the electric lamp.
In the drawing the reference numeral l repre
wise direction. However, should the heating unit
9 burn out Or open the circuit through the coil 26
the bimetallic strip 22 would return to normal
position, to contact the strip 2|, thus closing a
circuit momentarily through the fuse link i1, bar
l8, spring 22, contacts 24 and 23, strip 2! and
conductor 29. This circuit ‘will cause the fuse link
ii to fuse or melt thus allowing the disks 5 and
6 to be rotated by the spring 26 to place the heat
ing unit Ii] across the conductors 28 and 29.
The embodiments of the invention which have
and 6 pivotally mounted near its upper extremity.
been given herein are illustrations of how the
The disk 5 has two pins 1 and 8 secured thereto
various features may be accomplished andof the
for supporting one end of the ?laments or heat 45 principles involved. It is to be understood that
ing units 9 and ID. The pins 1 and 8 are con
the invention contained herein is capable of em
nected together by the bar I l . The disk 6 mount
bodiment in many other forms and adaptations,
ed on the opposite side of the stem 4 also has two
without departing from the spirit of the inven
pins I2 and I3 shown in Figure 2 for supporting
tion and the scope of the appended claims.
the other ends of the heating or lighting units 9 50 Having thus described my invention, I claim:
and III. A stabilizing bar i4 is securely fastened
1. In an electric lamp, a pair of ?laments. a
to the disks 5 and 6 so that they will rotate to
current supply circuit, spring controlled rotatable
gether. The disks are limited in their travel by
mechanism for supporting said ?laments, said
the pin l5 engaging the elongated slot in the lower
mechanism arranged to connect any one of said
rim of the disk 5. The disks Sand 6 are at ?rst 55 ?laments in predetermined position to said cur~
sents a bulb or tube broken away to show the ?la
ment or heating unit switching mechanism on the
inside of the evacuated bulb. In the center of
this bulb is a hollow stem 4 extending upward
from the base and having two ceramic disks 5
2,405,789
3
4
contact, a heating coil for each of the said mem
rent supply circuit, a fusable element for holding
bers, said members sensitive to their energized
said mechanism under tension of said spring to
coils for ?exing in the same direction to maintain
maintain one of said ?laments in said position, an
separation, whereby the deenergization of said
automatic switch comprising a pair of spaced bi
metallic contact members adapted to be actuated ‘in coil associated with said ?rst member causes its
associated portion to contact the portion ass into contact to connect said element to said sup
ciated
with said second members.
ply circuit, and means for closing said contact
7. An evacuated envelope, a pair of ?laments
member responsive to the disruption of the con
supported in said envelope, a current supply cir~
nected ?lament to open said link thereby releas~
cuit, switching mechanism arranged to connect
ins’ said mechanism to rotate another one of said
the current supply circuit through said ?laments
?laments to said predetermined position, and to
connect said other ?lament to the said current
supply circuit.
2. In an article of manufacture, a plurality of
electrical circuit elements, switching mechanism
for controlling the energizing circuit for said ele
ments, a fusible link for holding said mechanism
under tension, an automatic switch comp-rising a
?rst bimetallic strip and a second bimetallic strip
each having portions disposed with a relatively '
narrow space therebetween and adapted to be
actuated into contact to close an energizing cir
cuit through said link, a heating coil for said ?rst
strip connected in series with the ?rst one of ‘said
circuit elements, a heating coil for said second
in succession, a fusible link for holding said mech
anism under spring tension to connect one of said
?laments to said current supply circuit, a switch
ing device comprising a pair of spaced bimetallic
contact strips supported in said envelope and
adapted to be actuated into contact to close a
circuit from said current supply circuit through
said link, one of said strips responsive to a dis
rupted ?lament for closing said contact s rips to
disrupt said link, thereby actuating said mech
anism to connect another one of said ?laments
to the said current supply circuit.
8. In an evacuated envelope, a pair of ?la
ments, switching mechanism for controlling the
energizing circuits for said ?laments, a current
controlled holding device for maintaining said
strip connected to said energizing circuit, said
second strip sensitive to heat developed by its en»
ergizing coil for moving toward said ?rst strip,
said ?rst strip sensitive to heat developed by its
mechanism under tension to energize a ?rst ‘one
of said ?laments, a bimetallic switch comprising
energized coil for moving away from said second -‘
strip, and sensitive to the disruption of the en
ber, said members adapted to be actuated into
ergizing circuit in said ?rst element for moving
into engagement with said second strip, thereby
disrupting said link to release the said mechanism
for energizing a second one of said circuit ele» '
ments.
a flexible ?rst member and a flexible second mem —
contact to close a circuit through said device, a
coil for said ?rst member connected in series with
a ?rst one of said ?laments, said ?rst member
sensitive to its energized coil for maintaining sep
aration of said members and sensitive to the dis
ruption of the said ?rst ?lament connected in
series with its coil for engaging said second mem
ber to close a current path through said holding
3. In an evacuated bulb a ?lament supported
in said bulb, a switch comprising a pair of spaced
bimetallic members adapted to be actuated into
contact, a heating coil for each of said members 40 device, thereby actuating the said switching
mechanism for energizing another one of said
with one of the coils being in series with said ?la
?laments.
ment, said members sensitive to their energized
9. In an electric lamp, a pair of ?laments, each
coils for ?exing in the same direction to maintain
provided with a terminal contact, mechanism ro
separation, whereby the deenergization of said
one coil causes said members to contact.
4. In an article of manufacture ?rst and second
load elements, a quick make switching mechanism
for controlling an energizing circuit for said ele~
ments, a fusible link device for holding said mech
anism under tension to maintain said ?rst ele- '
ment in said energization circuit, an automatic
switch comprising a pair of spaced bimetallic con
tact members adapted to be actuated into con
tact, a heating coil for each of said members with
one of the coils in series with said ?rst element,
said members sensitive to the energization of said
coils for ?exing in the same direction to maintain
tatably mounted for supporting said ?laments
including said contacts, a brush adapted to en~
gage said contacts in succession, a fuse link for
holding said mechanism under tension to main
tain said brush in engagement with a ?rst one
of said ?laments, and mean-s for disrupting said
fuse link, thereby rotating the said mechanism
to establish a current through a second one of said
?laments.
10. In an electric lamp, a plurality of ?laments,
each provided with a contact, a brush, rotatable
mechanism for connecting said brush to said con- ‘
tacts in succession, a fuse link for said mechanism
to hold one of said contacts in engagement with
said brush, a source of current supply, a switch
one coil responsive to the disruption of said ?rst
element completes an energizing circuit through 60 device for closing a circuit through said fuse link
to the source of current supply to disrupt the said
said members and said fusible link device to cause
fuse link, thereby rotating said mechanism for
said mechanism in a quick movement to connect
connecting said brush with another one of said
said second element in said energizing circuit.
contacts.
5. In an evacuated envelope, a pair of spaced
11. In an article of manufacture, a plurality of
bimetallic contact members supported in said en 65
circuit elements, switching mechanism pivotally
velope adapted to be actuated into contact, a
mounted for controlling the energizing circuit for
heating coil for each of said members, said mem
said elements, a fusible link for holding said
bers sensitive to their energized coils for ?exing
mechanism under tension, an automatic switch
in the same direction to maintain separation,
whereby the deenergization of one of said coils 70 comprising a ?exible ?rst contact member and a
?exible second contact member disposed with a
causes said members to come into contact.
relatively narrow space therebetween and adapted
6. In an evacuated bulb, a ?rst bimetallic men to be actuated into contact to close an energizing
her and a second bimetallic member, said mem
circuit through said link, means for moving said
bers having portions with a relatively small space
therebetween and adapted to be actuated into 75 ?rst member away from said second member, and
separation, whereby the deenergization of said
2,405,789
5
6
for moving said second member toward said ?rst
member responsive to the energization of one of
said elements, and means for moving said ?rst
member into engagement with said second mem
ber responsive to the disruption of the said ener
current, switching mechanism rotatably mounted
gized element to rotate said mechanism for ener
gizing another one of said elements.
12. In an evacuated envelope, a pair of ?la
ments, switching mechanism for controlling the
energizing circuits for said ?laments, an automatic Switch comprising a pair of spaced bimetal
lic strips adapted to be actuated into contact, a
heating coil for each of said strips, said coil for
said ?rst strip connected in series with one of said
?laments, said strips sensitive to heat developed
by their energized coils for ?eXing in same direc
tion to maintain separation, said ?rst strip sensi
tive to the disruption of the said ?lament con
for supporting said ?laments including said con
tacts, a brush for connecting the source of cur“
rent to said contacts in succession, a fuse link for
holding said mechanism under tension to main
tain said brush in engagement with one of said
contacts, an automatic switch comprising ?rst
and second bimetallic strips adapted to close a
circuit from the source of current through said
‘ link, a heating coil for the ?rst contact strip con
nected in parallel to the source of current, said
?rst strip being sensitive to its energized coil for
?exing toward the second strip, another heating
coil for the second strip connected in series with
15 one of the said ?laments, said second strip being
sensitive to its energized coil for ?exing away
from the ?rst strip, and upon deenereization of
its coil for ?exing toward the ?rst strip to close
nected in series with its coil for moving into en
a circuit through the fuse link to the source of
gagement with said strip to thereby actuate the
said switching mechanism for energizing another
current, thereby disrupting the said link to ro
tate said mechanism for connecting'a second one
one of said ?laments.
13. In an electrical lamp, a pair of ?laments,
each provided with terminal contact, a source of
of said contacts to the source of current.
JOHN H. HOMRIGHOUS.
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