Improvements in or connected with Incandescence Electric Lamps.
Year: 1898

page_text: Date of Application, 7th Nov. 1898
Complete Specification Laft 20th July 1899-Accepted 2nd Sept. 1899
Complete Specification Left, 20th July, 1899-Accepted 2nd Sept, 1899
PROVISIONAL SPECIFICATION.
Improvements in or connected with Incandescence Electric Lamps.
We, LOUIS JOHN STEELE, of 14, Clarendon Road, Holland Park, Kensington,
Electrical Engineer, Sir JoHN BLUNDELL MAPLE, Bart., M.P., of 145, Totten-
ham Court Road, and JOHN VERITY, of 31, King Street, Covent Garden, Manu-
facturer, all in the County of London, do hereby declare the nature of this
invention to be as follows:-
This invention relates to incandescence electric lamps of the kind wherein
reflectors are provided which are more or less surrounded by the filaments.
Hitherto in the manufacture of such lamps considerable difficulties, from a
commercial standpoint, have been found in applying such reflectors especially
when formed of a solid rod or thick tube of a material which will not fuse
readily to the glass of the bulb. The object of our invention is to provide
means for holding such reflectors in position without fusing them to the bulbs
of the lamps as has heretofore been usual.
According to one arrangement we form in the head of the lamp a socket or
tube into which the reflector (which may be either solid or tubular) can be
inserted and secured, or the reflector may have its ends adapted to fit into
cavities in the extreme ends or other parts of the lamp (a spring being in some
cases inserted in one cavity to prevent the reflector from rattling when in posi-
tion and permit of expansion) or may be provided at either or both ends with
a wire or wires which is or are inserted into the adjacent cavity or cavities or
fused into the glass of the bulb.
In some cases the ends, of the reflectors instead of being adapted to enter
cavities in the ends of the lamp, may be themselves provided with cavities to
fit on projections suitably formed inside the lamp.
We may if desired use a reflector composed of a series of rods or tubes of
any section and configuration united together at the ends by caps or other suit-
able means and adapted to be supported in the lamp as described.
When the reflectors constructed according to our invention are filled with
a phosphorescent powder or the like we prefer to construct such reflectors as
follows, that is to say, after filling the tube with the phosphorescent material
and before closing the same we thoroughly heat the said material to dry the
same and drive off impurities and then close the tube in such a manner that no
moisture can enter the same, but that just before the reflector is to be placed
in a lamp the end can be broken off so that when the lamp bulb is exhausted
the air will also be exhausted from the interior of the reflector. A wad is
placed in the reflector to confine the phosphorescent or like material therein so
that when the end is broken off as herein before described the said material will
not escene

page_text: With this arrangement it will be understood that in manufacturing lamps
upon a commercial scale a large number of reflectors can be manufactured and
stored without detriment until required for use.
Dated this 7th day of November 1898.
G. F. REDFERN & Co.,
:
4, South Street, Finsbury, London, Agents for the Applicants.
:
Improvements in or connected with Incandescence Electric Lamps.
We, LOUIS JOHN STEELE, of 14, Clarendon Road, Holland Park, Kensington,
Electrical Engineer, Sir JoHN BLUNDELL MAPLE, Bart., M.P., of 145, Totten-
ham Court Road, and JoHN VERITY, of 31, King Street, Covent Garden, Manu-
facturer, all in the County of London, do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement: --
This invention relates to incandescence electric lamps of the kind wherein
reflectors are provided which are more or less surrounded by the filaments.
Hitherto in the manufacture of such lamps considerable difficulties, from a
commercial standpoint, have been found in applying such reflectors especially
when formed of solid rod or thick tube of a material which will not fuse
readily to the glass of the bulbs, and the object of our invention is to provide
means for holding such reflectors in position without fusing them to the bulbs
of the lamps as has heretofore been usual.
According to one arrangement we form in the head of the lamp a socket or
tube into which the reflector (which may be either solid or tubular) can be
inserted and secured; or the reflector may have its ends' adapted to fit into
cavities in the extreme ends or other parts of the lamp (a spring being in some
cases inserted in one cavity to prevent the reflector from rattling when in posi-
tion and permit of expansion) or may be provided at either or both ends with
a wire or wires which is or are inserted into the adjacent cavity or cavities or
fused into the glass of the bulb.
Our invention will be readily understood by reference to the accompanying
drawing, in which:-
Figure 1 is a sectional view of a lamp wherein the reflector is enclosed in a
transparent tube or socket formed upon the head of the lamp; and
Figure 2 is a sectional view shewing a slight modification of this arrangement:
Figure 3 is a view shewing the arrangement wherein the reflector is supported
in cavities at the two ends of a lamp::
Figure 4 shews the arrangement wherein a spring is introduced to prevent
rattling and allow expansion:
Figure 5 shews the arrangement where a reflector is at one end supported
by a wire and
Figure 6 an arrangement wherein each end of the reflector is supported by
a wire:
Figures 7, 8 and 9 are views illustrating slight modifications.
Similar letters of reference indicate corresponding parts in the several figures.
In the arrangement shewn in Figure 1 the bulb a has fused to the upper
end a tube 6 into which the reflector c, which may be either hollow or tubular,
is inserted, the said tube b at its lower end being made conical to support the
lower end of the tube and at its upper end containing a collar d which
holds the reflector c in a central position relatively with the tube 6. In

page_text: this arrangement a packing ring e of asbestos or other suitable fireproof
material is preferably placed between the bottom of the reflector and
the bottom of the tube for the purpose of preventing the entrance of dirt
into the tube and also for allowing the escape of any imprisoned air when
the bulb of the lamp is exhausted.
In the arrangement of our invention shewn in Figure 2 the tube 6 instead of
being adapted to wholly close the reflector forms a kind of socket in which the
reflector is inserted and secured by a suitable cement or filling as indicated at f.
In the arrangement shewn in Figure 3 the reflector (which may be either
solid or tubular) has its end made conical and inserted into cavities g, h in the
head and base of the lamp respectively.
in Figure 4 indicates the spring which may be placed at one end of the
reflector c when the latter is placed in position, the said spring serving to prevent
the reflector from rattling whilst at the same time allowing of a certain amount of
flexibility which in some cases may be advantageous.
In the arrangement shewn in Figure 5 only one end of the reflector is inserted
in the cavity 9 the other end of said reflector having attached to it a wire j
which may rest in the cavity h at the base of the lamp or be fused into the glass,
and in Figure 6 the arrangement is very similar except that the reflector has
wires j, j at both ends instead of at one end only.
In some cases the ends of the reflectors instead of being adapted to enter
cavities in the ends of the lamp, may be themselves provided with cavities to
fit on projections or tips suitably formed inside the lamp as indicated at k
Figure 7.
We may if desired use a reflector composed of a series of rods or tubes of any
section and configuration united together at the ends and adapted to be sup-
ported in the lamp by either of the methods herein before described.
As shewn
in Figure 8 the reflector c is composed of a series of rods 7, the ends of which
are inserted into caps or sockets m, m.
When the reflectors constructed according to our invention are filled with a
phosphorescent powder or the like we prefer to construct such reflectors in the
manner indicated in Figure 9, that is to say, after filling the reflector c with
the phospherescent material and inserting a wad n, and before closing the same,
we thoroughly heat the said material to dry the same and drive off impurities
and then close the tube by drawing it into a tip or point in such a manner that
no moisture can enter the same but that the said tip can be broken off, for
instance at the point o, to form a hole at p, so that when the reflector is in
position and the lamp bulb is exhausted the air will also be exhausted from the
interior of the reflector.
With this arrangement it will be understood that in manufacturing lamps
upon a commercial scale a large number of reflectors can be manufactured and
stored, without detriment, until required for use.
Although in the drawing we have shown the reflectors as in all cases being
arranged in the lamps longitudinally, it is to be understood that our reflectors
may be supported transversely of the bulbs or in any other desired direction.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that
what we claim is:-
1. In an incandescence electric lamp the arrangement of a reflector which is
supported in the bulb of the lamp but is made separate therefrom, substantially
as described.
2. An incandescence electric lamp wherein the reflector is inserted into a tube
or socket formed in the head of the lamp, substantially as described.
3. An incandescence electric lamp having a reflector which is supported at
both ends, the said ends or a wire or wires thereon being directly carried in
cavities in the said lamp, substantially as described.

page_text: 4. An incandescence electric lamp wherein a reflector having a cavity in either
or both ends is supported upon a corresponding projection or projections on the
bulb, substantially as described.
5. In an incandescence electric lamp wherein a reflector is supported at both
ends in the bulb of the said lamp, the arrangement of a spring in connection
with the said reflector, substantially as, and for the purpose, described.
6. In an incandescence electric lamp a reflector composed of a series of rods
or tubes united by caps or sockets or otherwise and supported on projections on
or in cavities in the bulb of the said lamp, substantially as described.
7. In an incandescence electric lamp having a reflector supported in the bulb
of the said lamp but separate therefrom, forming the said reflector with a tip
or point which can be broken off, substantially as, and for the purpose, described.
Dated this 29th day of July 1899.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.