Improvements in Mounting Incandescing Electric Lamp Bulbs.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Mounting Incandescing Electric Lamp Bulbs.
We, HERBERT MOUL and ANDREW LIND, both of 8, Hythe Road, Willesden
Junction, in the County of Middlesex, Engineers, do hereby declare the nature
of this invention to be as follows:-
This invention relates to an improved method of fixing the glass bulbs of
incandescing electric lamps in the caps whereby the said lamps are mounted
in their holders; the objects of the invention being to secure greater accuracy
and firmness than are attainable by the methods hitherto employed.
In carrying out our invention, we form the neck of the bulb which enters
the cap by blowing same in a mould, and we provide this neck with one or
more depressions or dents. In the material forming the body of the cap, we
punch one or more tongues adapted to enter the dents in the bulb either in
a plane parallel with the axis of the cap or at any desired angle thereto. The
neck of the bulb is then inserted in the cap, and the tongue or tongues are bent
into the depressions or dents in the neck; these depressions being previously
or subsequently filled with plaster, or other suitable cement, to render the bulb
a fixture in the cap. By these means, we obtain a firm connection between
the cap and the bulb, and resistance to torsional or longitudinal strain is
afforded by the metal tongue or tongues; the fastening of the bulb in its cap
being no longer dependent upon the strength of the plaster or other cement
which surrounds the neck or which enters the depressions formed therein.
Tated th 19th day of April 1809
Improvements in Mounting Incandescing Electric Lamp Bulbs.
We, HERBERT MOUL and ANDREW LIND, both of 8, Hythe Road, Willesden
Junction, in the County of Middlesex, Engineers, do hereby declare the nature
of this invention and in what manner the same is to be performed to be par-
ticularly described and ascertained in and by the following statement:-
This invention relates to an improved method of fixing the glass bulbs of
incandescing electric lamps in the caps whereby the said lamps are mounted
in their holders; the objects of the invention being to secure greater accuracy
and firmness than are attainable by the methods hitherto employed.

page_text: In the accompanying drawings is illustrated, by way of example, a lamp in
which the bulb is fixed in its cap or socket according to our improved method;
Fig. 1 being a vertical section of the lamp-bulb and cap, Fig. 2 a side elevation
and Fig. 3a transverse section on the line - (Fig. 1).
In carrying out our invention, we form the neck a of the bulb which enters
the cap by blowing the same in a mould, and we provide this neck with one
or more depressions or dents a¹a¹. In the material forming the body of the
cap, we punch one or more tongues adapted to enter the dents a¹ in the
neck of the bulb, either in a plane parallel with the axis of the cap or at any
desired angle thereto. The neck a of the bulb is then inserted in the cap,
and the tongue or tongues b' are bent inwards so as to enter the depressions or
dents a¹ in the said neck: these depressions being previously or subsequently
filled with plaster c, or other suitable cement, with a view to rendering the
bulb a fixture in the cap. By these means, we obtain a firm connection between
the cap and the bulb; resistance to torsional or longitudinal strain being
primarily afforded by the metal tongue or tongues instead of capability to
resist such strain being dependent upon the strength of the plaster or other
cement which surrounds the neck or which enters the depressions formed
therein.
"
Although we have only illustrated our invention as applied to a cap of the
"bayonet type. we would have it known that we do not restrict ourselves
thereto, our method of fixing being equally applicable to screw, Siemens, loop
and other types of mounting.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we claim :-
In the manufacture of incandescing electric lamps, the herein described
method of fixing the bulb in its cap or socket, consisting in forming one or more
depressions or dents in the neck of the bulb and one or more tongues in the
cap and then bending the latter inwards so as to occupy the said depressions
or dents, substantially as set forth.
Dated this 18th day of January 1900
G. G. M. HARDINGHAM,
Chartered Patent Agent, Clun House, Surrey Street, London, W.C.