Improvements in Glass Globes, Screens, Covers, or the like for Electrical Incandescence and other Lamps, and in Means for Manufacturing the same.
Year: 1899

page_text: Improvements in Glass Globes, Screens, Covers, or the like for Electrical
Incandescence and other Lamps, and in Means for Manufacturing
the same.
I, EDWARD APPLEGARTH, of 2, Vernon Chambers, Southampton Row, London,
Mining Engineer, do hereby declare the nature of this invention to be as
follows:-
-
This invention relates more especially to improvements in glass globes, or
covers for enveloping ordinary electrical incandescence lamps in order to diffuse
reflect or refract, the rays of light produced by the incandescent filament. But
the invention is also applicable to glass globes, screens, shades, covers, chimneys,
mantles, or reflectors as applied to lamps of any other kind. The internal and
external surfaces of such glass globes or covers are made of peculiar lens-like
or prismatic shape according to requirements, and in order to obtain such
surfaces, an accumulation of glass rods has been employed both in the form of
straight lengths, as, for example, for chimneys for Argand gas burners, and
also in the form of continuous helical coils as, for example, for globes for envelop-
ing electrical incandescence lamps..
"'
According to my invention instead of forming the glass globe, or the like,
of a number of separate lengths or convolutions of glass rod, I cast or mould
The same in suitable moulds so that the surfaces of lens-like or prismatic form
of whatever desired shape are imparted to both the interior and exterior of the
globe or the like. The globe or the like may be cast in two or more parts, the
division or divisions being preferably in a plane transverse to the lines formed
by the lenses or prisms. For example, in the case of a globe for enveloping an
ordinary electrical incandescence lamp with lens-like or prismatic surfaces con-
sisting of ribs or corrugations in a direction transverse to the longitudinal axis
of the lamp, the division would preferably be in a direction parallel to that axis,
so that the inner mould which forms the internal corrugated, surface would
freely leave the said corrugations after the casting or moulding operation. In
some cases however such globes may be cast with the division transverse to the
axis of the lamp and the moulds made with "draw-backs" or other similar and
well-known devices for ensuring the easy separation of the globe or the like
from the moulds. The edges forming the dividing lines of the globe or the like
may be trimmed and fitted by grinding or otherwise and the two or more parts
are secured or bound together by: one or more wires or other convenient' means
of fastening.
Fr..

page_text: Improvements in Glass Globes, Screens, Covers, or the like for Electrical
Incandescence and other Lamps, and in Means for Manufacturing
the same.
I, EDWARD APPLEGARTH, of 2, Vernon Chambers, Southampton Row, London,
Mining Engineer, 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 more especially to improvements in glass globes, or
covers, for enveloping ordinary electrical incandescence lamps in order to diffuse,
reflect, or refract, the rays of light produced by the incandescent filament. But
the invention is also applicable to glass globes, screens, shades, covers, chimneys,
mantles, or reflectors applied to lamps of any other kind.
The accompanying drawings illustrate globes, shades or covers constructed in
accordance with this invention. Figure 1 is an outside view of a globe enveloping
an ordinary incandescence lamp; Figure 2 is a view of one half of such a globe
looking towards the interior thereof on line 2- of Figure 1; and Figure 3 is a
similar view of a globe intended for use with a gas. burner.
The internal and external surfaces of such glass globes or covers are made of
peculiar lens-like or prismatic shape according to requirements, and in order to
obtain such surfaces, an accumulation of glass rods has been employed both in
the form of straight lengths, as, for example, for chimneys for Argand gas
burners, and also in the form of continuous helical coils as, for example, for
globes for enveloping electrical incandescence lamps..
According to my invention, instead of forming the glass globe, or the like,
of a number of separate lengths or convolutions of glass rod, I cast or mould
the same in suitable moulds so that the surfaces of lens-like or prismatic form
of whatever desired shape are imparted to both the interior and exterior of the
globe or the like as shewn in the drawings. The globe or the like for convenience
of manufacture may be cast or moulded in two or more parts, the division or
division being preferably in a plane transverse to the lines formed by the lenses
or prisms. For example, Figures 1 and 2 illustrate a globe a enveloping an
ordinary electrical incandescence lamp b, with lens-like or prismatic surfaces c
consisting of ribs or corrugations in a direction transverse to the longitudinal
axis of the lamp b, the division being in a direction parallel to that axis,' so
that the inner mould which forms the internal corrugated surface freely leaves
the said corrugations after the casting or moulding operation. In some cases
Fowever such globes may be cast with the division transverse to the axis of
the lamp and the moulds made with "draw-backs" or other similar and well
known devices for ensuring the easy separation of the globe or the like from
the moulds. The edges forming the dividing lines of the globe or the like
may be trimmed and fitted by grinding or otherwise and the two or more parts
are secured or bound together by one or more wires or other convenient
means of fastening. But it is obvious that in the case of more or less straight-
sided or cylindrical chimneys with longitudinal ribs or lense for example, no
division is necessary as the inner mould could be withdrawn lengthwise of the
chimney.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
First. A glass globe, screen, cover, or the like, for electrical incandescence

page_text: and other lamps, provided with lens-like or prismatic internal and external
surfaces formed by casting or moulding, substantially as described with reference
to the drawings.
Second. A cast or moulded glass globe, screen, cover or the like, for electrical
incandescence and other lamps, having lens-like or prismatic internal and
external surfaces and constructed in two or more parts, substantially as described
with reference to the drawings.
Third. In the manufacture of glass globes, screens, covers or the like, with
lens-like or prismatic internal and external surfaces, for electrical incandescence
and other lamps, forming such internal and external surfaces by casting .or
moulding, substantially as described.
Dated this 20th day of March 1900.
E. APPLEGARTH.
Per W. H. Beck,
Agent,
115, Cannon Street, London, E.C.
E. APPLEGARTH.
Per W. H. Beck,
Agent,
115, Cannon Street, London, E.C.