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Патент USA US3070777

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Dec. 25, 1962
Filed Feb. 1, 1962
United States Patent O?iice
Patented Dec. 25, 1962
FIGURE 2 is an end view or my adapter as it would
appear along the line 2-2 of FIGURE 1.
The accompanying drawing shows a conventional elec
trical outlet as socket 10, which diagrammatically repre
3,970,767 ..
Jacob Rabinow, Takoma Park, Md., assignor to Rabmow
Engineering Co., Inc., Rockville, Md.
Filed Feb. 1, 1962, Ser. No. 170,601
‘5 Claims. (Cl. 338-70)
This invention relates to voltage reducing devices, and
particularly to devices to prolong the life of electric lamps.
The life of ordinary electric lamps is quite short. Since
sents any kind of standard socket as would be vused in a
ceiling ?xture, an outdoor sign, a table or floor lamp, etc.
Electric lamp 12 is also conventional and as such, ‘is pro
vided with a threaded connector 14 at one end which
electric lamps are not expensive, there appears to be no
great effort directed towarl improving their useful life.
Possibly, there are other reasons why electric lamps are
not constructed of better quality but these are not pertinent
here. The fact is that the life of electric lamps could be
prolonged to avoid the bother of having to replace lamps
when they burn out. Replacement of electric lamps is
particularly bothersome when they are located in com
paratively inaccessible places. It is even more of a
bother to replace an electric lamp when to do so, for in
stance, requires that a ?xture be partially disassembled.
Ordinary ceiling ?xtures are one example, especially if
they are ?ush mounted.
There are at least two ways to prolong the life of elec
tric lamps, without improving the lamps themselves. One
is to reduce the initial surge when a cold electric lamp is
energized. Lamps often burn out at the instant that they
would ordinarily ?t into socket 10 with the center contact
of the connector 14 engaging the center contact (not
shown) of socket 10.
My adapter is made of a single piece, metal shell 16
having a ?rst section 18 and a second section 20 coaxial
therewith. Section 20 has a mouth 22 at one end de?ned
by a cylindrical skirt which ?ts against (or partially
around) the glass part of electric lamp 12 when the elec
tric lamp is screwed fully into the adapter. _ Inasmuch as
connector 14 must be threaded into the threads of section
20, the inside diameter of section 20 is of a size so that
this section will accept and retain the connector of the elec
tric lamp. For protective purposes section 20 has an
outer coating 24 of insulating material, for instance a ‘syn
thetic resin ?lm, a ceramic wash, or the equivalent. Coat
ing 24 is preferably (but not necessarily) bonded or other
wise adhered to the outer surface of section 20 of shell 16.
Section 18 of shell 16 must ?t into and engage the
Another way to prolong the life of an
shell (not shown) of socket 10. Therefore the outside
diameter of section 18 is suitably dimensioned for this
electric lamp is to operate it below the rated voltage of
purpose, and it has screw threads so that the adapter may
are turned on.
the lamp. When doing this the illumination is reduced, Si) be threaded into socket 10 either before'or after the elec
tric lamp 12 is engaged by section 20.
but this presents no problem since one can use, for exam
ple, a 75 watt lamp in a place where one would ordinarily
‘use a 60 watt lamp.
An electrically insulating base 26 ‘extends transversely
across the shell and is attached to one end of section 18,
e.g. by crimping as at 27. The base can be made of ce
There have been prior methods of increasing the life
of electric lamps. For instance, in theaters where the '
ramic, “Bakelite,” glass (as the base of connector 14) or
lamps are very high and in stadiums Where lights are used
the like. An axial projection, for instance, short post 28,
forms a part of base- 26 and extends inwardly of shell 16.
for night-time activities, the power is gradually increased
Post 28 serves several purposes, one of which is to support
so that there is no sudden surge. Then, when the lamps
are heated, full power is applied. In addition, electric 40 contact 30 against which the center contact of the electric
lamp bears. As shown, contact 30 is a shallow cup which
lamp intensity controls using resistors are very common.
is pressed on or otherwise attached to post 28. If de~
Most automobiles have intensity controls for the lamps
sired, the center part of contact 30 can be struck up to
which illuminate the instrument panels thereof. US.
form a resilient contact such as shown in U.S. Patent No.
Patents Numbers 1,750,740 and 2,721,917 disclose in~
1,750,740 or as found in most conventional sockets 10.
tensity regulators for electric lamps which permit the elec- }
The outer center contact 32 is secured to the outer surface
tric lamps to operate at a voltage below the lamp-rated
of base 26, and contact 32 may be of any con?guration
voltage. The devices disclosed in the above patents, as
such as a shallow cup (shown) which is pressed in place,
all other prior devices for the same purpose of which I
or a small metal soldering tab (not shown) which is par
am aware, suffer from the same drawback. They are
tially embedded in the base. Resistor 34 is preferably a
complex and expensive for so simple a task. Their com—
plexity makes them questionably practical from a commer 50 resistance wire which extends through a passage in base
cial standpoint.
The main object of my invention is to provide a simple,
26 and has one end crimped under or soldered to contact
practical, and inexpensive voltage reducing adapter for a
32. The other end of the resistance wire is wrapped
around post 28 and is secured to the inner contact 30 by
lamp, which also reduces initial surge and the voltage level
suitable means such as soldering.
at which the lamp operates, thereby prolonging the life
of the lamp.
I emphasize the simplicity and practicability of my in
vention. To be commercially acceptable the voltage-re
ducer adapter must be inexpensive, for example, it must
cost approximately the same or less than a light bulb. 60
In use, the adapter is screwed into socket 10 and the
lamp is screwed into the adapter. The electrical circuit
for the ?lament of lamp 12 is established through shell 16,
the threaded part of connector 14, the lamp ?lament, and
then through the center contact of the lamp and contact
30, the resistor 34 and contact 32. When the adapter is
Secondly, it must be safe, easy to use, and must occupy
used for a brief period, the resistor will produce heat.
a very small space. The illustrated embodiment of my
The heat will not be nearly so great as that produced by
invention ful?lls these requirements and yet, will achieve
the electric lamp. The heat of the resistor will be dis
its objective of prolonging the life of electric lamps.
sipated through shell 16, it being noted that the insulated
Other objects and features of importance will become
part of the shell is on the exterior of socket 10‘ where it
apparent in following the description of the illustrated
may be cooled by ambient air. Accordingly, the adapter
form of the invention.
inherently functions as a heat sink for the heat of the re
FIGURE 1 is a partially elevational and partially sec
sistor. When the light bulb 12 is operating at a reduced
tional exploded view showing a conventional electric lamp,
the heat generated by the bulb itself will be some
a conventional socket, and my adapter interposed therebe 70 what less than if the bulb operated at full intensity and
therefore the total heat of the combined adapter and bulb
is slightly lower than that of the bulb used without the
joined sections with the ?rst section having a slightly
smaller diameter than the second section, said sections
having means to engage the threads of the electric socket
and means to engage and hold the electric lamp respec
It is understood that various changes, modi?cations and
alterations may be made without departing from the pro
tection of the following claims.
I claim:
1. A voltage reducing adapter for a lamp socket con
taining threads, said adapter comprising a single-piece con~
tively, a transverse insulating base joined to and trans
versely closing one end of said ?rst section, a center con
tact rigidly and immovably ?xed on the outer surface of
said base and adapted to engage the center contact of
the electric socket, a separate contact contained entirely
ductive shell having a ?rst section and a second section,
said ?rst section having a thread and being of an outside di 10 within said ?rst section and adapted to be engaged by
the center contact of the lamp, a resistive wire, said base
ameter to ?t into said socket, said second section having a
lamp-connector receiving thread and being of an internal
having a passageway through which said wire extends, said
wire secured at its ends to the contacts of said adapter,
diameter to receive a lamp connector, an insulating base
and means to serve the dual purpose of supporting said
attached to and closing one end of said ?rst section, a
contact rigidly and immovably ?xed on the exterior of 15 separate contact and providing a support for a part of
said wire, said dual purpose means comprising an insulat
said base to engage the center contact of a socket, an in
sulating member rigid with said base and extending axial
ing post ?xed immovably to said base and extending axial
ly within said base and having an end terminating short of
ly and inwardly of said ?rst section, a second contact im
movably ?xed on the inner end of said member located
the juncture of said ?rst and second sections, and said
within said ?rst section to be engaged by the center con 20 separate contact attached to the end of said post thereby
positioning the separate contact inwardly of said ?rst sec
tact of a lamp connector, and a resistor connected to said
tion and on the longitudinal axis thereof.
contacts so that when a lamp is screwed into said adapter
and the adapter is screwed into a socket the resistor is in
5. The adapter of claim 4 and a mouth portion at the
series with the lamp ?lament to reduce surges and also the
outer end of said second section which extends beyond
25 said lamp engaging and holding means, and the location
voltage level at which the lamp operates.
2. The adapter of claim 1 wherein said ?rst section has
of said separate contact inwardly of said ?rst section to
an insulating coating covering the exposed surface there
gether with said mouth portion allowing the base of a
of, and a skirt at one end of said second section to assure
conventional lamp to be received completely within the
that the entire lamp base is received by said second section.
adapter and at such position that a portion of the lamp
3. The adapter of claim 2 wherein said insulating mem 30 base is within the electric socket when the adapter is
ber forms a seat and support for said second contact and
screwed into the socket.
also forms a support for said resistor.
4. A voltage reducing adapter for an electric socket
References Cited in the ?le of this patent
containing threads, to prolong the life of an electric lamp
by reducing electrical surge and the voltage level at which
the lamp operates, said adapter comprising a single piece
conductive shell having ?rst and second axially aligned
Gardner ______________ __ July 22, 1919
Duerkob ______________ __ Oct. 25, 1955
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