Improvements in or connected with Incandescent Electric Lamps.
Year: 1897

page_text: Date of Application, 23rd Jan., 1897
Complete Specification Left, 20th Sept., 1897-Accepted, 23rd Oct., 1897
PROVISIONAL SPECIFICATION.
Improvements in or connected with Incandescent Electric Lamps.
We, THE BRITISH INCANDESCENT ELECTRIC LAMP COMPANY LIMITED of Hythe
Road, Willesden Junction in the County of London, and HERBERT EDMUND MOUL
of the same place, Electrical Engineer, do hereby declare the nature of this
invention to be as follows: —
The object of this Invention is to provide efficient means for connecting the
cap to the neck of the glass bulb of incandescent electric lamps without the use of
cement for the purpose. It has been proposed to do this by expanding the glass
at the base of the bulb by blowing it around the cap piece or ring, but this
process is inconvenient and difficult and the glass is very liable to fracture.
According to this Invention a groove or grooves or recess or recesses is or are
formed in the neck of the bulb by blowing or pressing and the cap is secured
to the bulb by a wire or wires or strip or strips or spring or springs secured to
the cap and entering the said groove or grooves or recess or recesses in the neck
of the bulb which the said wire or wires, strip or strips or spring or springs
should fit sufficiently truly to hold the bulb firmly in position.
We do not
limit ourselves to precise details as they may be considerably varied without
departing from the nature of this Invention but the following are examples
illustrating suitable methods of attachment according to this Invention.
The neck of the bulb in the process of blowing in a suitable mould, is pro-
vided with a groove or recess on opposite sides and the cap is provided with
slots or openings and after the neck of the bulb is inserted in the cap a strip of
sheet metal or a metal wire is passed through the slots or openings in the cap so
as to engage in the said grooves or recesses in the neck of the bulb and the ends
of the strip or wire are then bent and soldered to the cap. Or the cap has four
holes formed in it, for the passage of the strip or wire which is passed to out-
side the cap and is soldered to the outside thereof both at the ends and at its
mid-portion of the said strip or wire. Or two holes may be made in the cap
through which the ends of the strip or wire, passing round the neck of the bulb
and engaging with the grooves or recesses therein pass; the mid-portion of the
strip or wire lying within the cap and the ends of the strip or wire are soldered
to outside of the cap, the mid-portion of such strip or wire being soldered to
the inside of the cap.
Instead of the rigid strips or wires, springs may be fitted or secured to the
cap, the said springs engaging in the grooves or recesses in the neck of the bulb
when the cap is passed thereover.
In all cases the bulb is firmly secured to the cap which can be held in the
holder in any usual or suitable way.

page_text: improvements in оr соплесted with incandescent Llectric Lamps.
We, THE BRITISH INCANDESCENT ELECTRIC LAMP COMPANY LIMITED of Hythe
Road, Willesden Junction in the County of London, and HERBERT EDMUND MOUL
of the same place, Electrical 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:-
The object of this Invention is to provide efficient means for connecting the
cap to the neck of the glass bulb of incandescent electric lamps without the use of
cement for the purpose. It has been proposed to do this by expanding the glass
at the base of the bulb by blowing it around the cap piece or ring, but this
process is inconvenient and difficult and the glass is very liable to fracture.
According to this Invention a groove or grooves or recess or recesses is or are
formed in the neck of the bulb by blowing or pressing and the cap is secured
to the bulb by a wire or wires, strip or strips or spring or springs secured to
the cap and entering the said groove or grooves or recess or recesses in the neck
of the bulb which the said wire or wires, strip or strips or spring or springs
should fit sufficiently truly to hold the bulb firmly in position. We do not
limit ourselves to precise details as they may be considerably varied without
departing from the nature of this invention but the arrangements shewn in the
accompanying drawings are examples illustrating suitable methods of attachment
according to this invention as applied to an Edison screw cap.
Figure 1 is a sectional view shewing one manner of carrying this invention into
practice, part of the lamp bulb in this figure being represented in elevation.
Figure 1 is an elevation of the cap detached from the lamp bulb.
Figure 2 is a transverse section on the line 2-2 of Figure 1.
Figures 3 and 4 are views substantially similar to Figures 1 and 2 shewing
a second way of carrying out the invention and
Figures 5, 6 and are transverse sections shewing other modifications all of
which are hereinafter fully described.
Like letters of reference indicate like or corresponding parts throughout the
various figures of the drawings.
The neck of the bulb A, in the process of blowing in a suitable mould is pro-
vided with a groove or recess a or with two such grooves or recesses on preferably
opposite sides as shewn in the drawings and the cap c is provided with slots
or openings Figures 1 and 2 and after the neck of the bulb is inserted in the
cap a strip of sheet metal or a metal wire b is passed through the slots or openings
in the cap c so as to engage in the said grooves or recesses a in the neck of the
bulb and the ends of the strip or wire are then bent and soldered to the cap,
all as shewn in Figures 1 and 2. Or as shewn in Figures 3 and 4 the cap chas
four holes or recesses c¹ formed in it, for the passage or reception of the strip
or wire 6 which is passed to outside the cap and is soldered to the outside thereof
both at the ends 6 and at the mid-portion 62 of the said strip or wire. Or, as
shewn in Figure 5, two holes or recesses c¹ may be made in the cap c through
which pass the ends 61 of the strip or wire b, extending round the neck of the bulb
and engaging with the grooves or recesses a therein, the mid-portion 62 of the
strip or wire b lying within the cap c and the ends 61 of the strip or wire are
soldered to the outside of the cap, the mid-portion of such strip or wire being
soldered to the inside of the cap.
Instead of the rigid strips or wires 6 hereinbefore described, springs e may
be fitted or secured to the cap, as shewn in Figures 6 and 7, the said springs

page_text: engaging in the grooves or recesses a in the neck of the bulb when the cap c is
passed thereover.
In all cases the bulb is firmly secured to the cap which can be held in the
holder in any usual or suitable way.
Although we have shewn an Edison screw cap we do not limit ourselves to the
use of that as any description of cap may be used.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:-
-
1. The connection of the cap to the glass bulb of an incandescent electric lamp
by means of a groove or grooves or recess or recesses in the neck of the bulb
and a wire or wires or strip or strips or spring or springs fitting or engaging in
the said groove or grooves or recess or recesses and secured to the cap, sub-
stantially as hereinbefore described.
2. The several arrangements for securing the cap to the glass bulb of in-
candescent electric lamps as hereinbefore described and represented in the
accompanying drawings."
Dated this 20th day of fentember 1897
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.