Improvements in Electric Incandescent or Glow Lamps.
Year: 1895

page_text: Date of Application, 31st Oct., 1895
Complete Specification Left. 30th July, 1896-Accented. 31st Oct.. 1896
PROVISIONAL SPECIFICATION.
Improvements in Electric Incandescent or Glow Lamps.
REUBEN JAMES BOTT Electrical Engineer 9 Park Place Villas St. Mary's
Paddington London do hereby declare the nature of this invention to be as
follows:-
My invention consists of improvements in the bayonet caps or collars of electric
glow lamps, and is designed to supersede the usual method of capping with plaster
or cement. I make the cap of glass, which can be blown and moulded to the
required size and shape to fit a bayonet holder, with the engaging pins either
moulded with, or fixed on to the sides of the cap, but preferably in the sides
of the cap, I make two indentations opposite to each other, I fit a narrow
metal band round the collar having two holes which are arranged to come opposite
the indentations in the glass collar, I then screw or fit by suitable means,
two small pins which serve as the engaging pins for the bayonet slot of the
holder, the pins pass through the metal band into the indentations, thereby securing
the metal hand to the glass cap. In some cases 1 may dispense with the metal band
and fix the engaging pins in the indentations of the cap with a suitable cement or
other means, I also find it convenient to use a narrow corrugated metal band
preferably with the engaging pins already fitted, which I place in a mould in which
the glass cap is formed, or if the glass cap is first made, the end is heated, and
the metal band is slipped on to the required position and the glass is then worked
out to its proper size.
I also make another form, whereby the engaging pins will be securely held in
position; across the cap in the position required, I fit by suitable means, a glass
tube, the ends being moulded or fused into the sides of the cap, in this tube is fitted
a pin the ends of which serve as the engaging pins for the holder, this pin may be
secured by plaster, coment, screws or springs or other suitable means.
The tube may be arranged to receive small switching arrangements when one
or more filaments are regulated in the collar of a lamp by a switch.
The socket end of the cap is provided with a suitable recess or recesses, to receive
the contact plates, which may be secured by plaster or other suitable cement,
but preferably I form the contacts with spring teeth, which engage into and onto
small projections and recesses in the glass, which firmly grip and lock the contacts,
either with or without the aid of plaster or cement. In some cases it will be
preferable to lead the conducting wires through either one or more glass tubes to
the filament the tube or tubes would in this instance form a continuation of the
glass cap.
I may find it convenient to use a non-combustable band round the glass cap,
to form a cushion between the collar and the metal socket of the holder.
The glass cap being made to the required form to join on to the neck of the
lamp bulb is then mounted with the filament, the filament is then passed through
the neck into the bulb, I then heat the edges and weld or join the two together,
in the form of collar last described, I make the collar a continuation of the bulb, then
fit the filament in the bulb, and close over the top, sealing the platinum conducting
wires, and forming the recess or recesses before described, thereby making a com-
plete lamp of glass as described, the lamp is then ready for exhausting.
.: 01-1
1007
REUBEN JAMES BOTT.

page_text: Improvements in Electrio Incandescent or Glow Lamps.
I, REUBEN JAMES BOTT, Electrical Engineer, of 9, Park Place Villas, St. Mary's
Paddington, in the County of London, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
My invention relates to improvements in electric incandescent or glow lamps, and
is designed to supersede the usual method of capping with plaster or cement.
For this purpose, instead of securing on the neck of the lamp by means of
plaster or cement, a soparate metal cap provided with contact-pieces or plates
connected with the leading-in wires, as heretofore practised, I make the lamp as
hereinafter described with a cap of glass which is formed integrally with the neck
of the lamp and is provided with pins or studs to fit into the slots of the bayonet-
joints usually employed for securing such lamps in their holders, and I attach
to the said glass cap suitable contact pieces or plates connected to the leading-in
wires of the lamp.
The said glass cap is blown and moulded or otherwise brought to the required
size and shape to fit the holder, and the engaging pins or studs are fixed upon
the sides of the said cap as hereinafter described.
According to one method, I make two indentations opposite to each other in the
sides of the cap, and fit around the glass cap a narrow metal band or ring
having two holes which are arranged to come opposite the indentations in the
glass cap or collar, I then fix in the said band or ring, by screwing or in any
other suitable manner, two small pins which serve as the engaging pins for the
bayonet-slot of the holder, which pins extend through the metal band or ring into
the indentations, thereby securing the metal band to the glass cap.
In some cases I dispense with the metal band or ring and fix the engaging pins
in tubes formed or fixed in the cap and closed at their inner end, by means of a
suitable cement or by other convenient means.
According to another method, I take a narrow corrugated metal band or ring
preferably with the engaging pins already fixed therein or attached thereto, and
I place the said band or ring in a mould in which the glass cap is to be formed; when
the said cap is moulded, the corrugations of the band or ring will be held in
indentations in the glass cap, and the said band or ring will thus be securely fixed
upon the said cap. Or if the glass cap is first made, the end thereof is heated, and the
metal band or ring slipped on to the required position and the glass is then worked
out to its proper size, or to such a size as to hold the said band or ring securely
in place.
According to another form or modification of my invention, I provide a glass
tube which extends across the cap in the position required, the ends being moulded
or fused into the sides of the cap, and I insert in this tube a pin the ends of
which serve as the pins or studs for engaging with the holder, this pin may be
secured in the said tube by plaster, cement, screws or springs, or by other suitable
means.
The said tube may be arranged to receive small switching arrangements when
one or more filaments are regulated in the cap of a lamp by a switch.
The closed end of the cap which enters the socket of the holder is provided
with a suitable recess or recesses, to receive the contact plates, which may be
secured by plaster or other suitable cement. I sometimes form the contacts with
spring teeth, which engage with small projections or recesses in the glass, and
thus firmly grip and lock the contacts, either with or without the aid of plaster or
cement. Or the glass is coated with a metallic deposit and the contact plates
soldered thereto. In some cases it will be preferable to lead the conducting wires

page_text: nough either one of more grass tuves to the mament, when tube or tuves would, in
this instance, form a continuation of the glass cap.
I may find it convenient to use a non-combustible band round the glass cap, to form
a cushion between the same and the metal socket of the holder.
In the accompanying drawings I have illustrated various methods of carrying
my invention into practical effect.
Figure 1 shows, in sectional elevation, one form of my improved electric glow
lamp.
Figure 2 is an elevation, partly in section on the line æ, æ, Figure 1.
Figure 3 is a side elevation showing another form or modification of my improved
lamp.
Figure 4 is an elevation, partly in section on the line a, a, Figure 3.
Figures 5 and 6 are similar views to Figures 1 and 2 respectively, showing another
form or modification of my improved lamp.
Figure 7 is a plan showing a detail of construction.
Figures 8 and 9 are similar views to Figures 3 and 4 illustrating a further
modification of my improved lamp.
Figures 10 and 12 are sectional elevations, and
Figures 11 and 13 are plans or top views, illustrating different modes of securing
the contact pieces or plates to the glass cap, and
Figures 14 and 15 are edge views showing details of construction.
Like letters of reference indicate corresponding parts throughout the drawing.
a is the glass cap which is formed integrally with the neck of the lamp.
c, c are the engaging pins or studs. d, e are the leading-in wires of the lamp,
which are attached respectively to contact pieces or plates f, g, Figures 10 to 13.
secured in any suitable manner to the glass cap a. The contact pieces or plates are
not shown in Figures 1 to 9, but in any of the lamps shown in these figures,
I arrange the said contact pieces or plates in the manner hereinafter described with
reference to Figures 10 and 11 or to Figures 12 and 13, or attach them to the
glass cap in any other suitable manner.
In the lamp shown in Figures 1 and 2, recesses or indentations a¹ are formed
in opposite sides of the glass cap a, and a metal band or ring his employed
having holes coinciding in position with the indentations a', and in which the
pins care fixed in such a manner that they extend through the said band or ring
into the said indentations and thus secure the said band or ring upon the glass
capa and prevent its turning thereon. I sometimes make the said cap with a
circumferential groove a² and so form the said band or ring that the latter can be
sprung over the end of the cap and will then slightly contract so that it will he
retained in the said groove. The said metal band or ring may be of any suitable
shape in transverse section. It may, if desired, consist of a spiral or other suitable
spring.
In the lamp shown in Figures 3 and 4, the pins are secured by means of
plaster or cement in recesses or indentations a' formed in opposite sides of the
glass cap a.
According to the modification of my invention shown in Figures 5 and 6,
I make the metal band with corrugations h', Figure 7, and I fit the said band
upon the glass cap a before the latter is blown to its full diameter, then, while
the said cap is hot, I work it out to its proper size. In this operation the corruga-
tions form indentations in the cap, and the band is thus prevented from turning
thereon, whilst the cap above and below the band is expanded so as to engage
with the latter and hold it securely in place. Instead of making the band h with
corrugations, I can make it in any other convenient manner so that it will be
securely retained in place upon the cap. For instance I can make it with notches /²
as shown in Figure 14, or with openings as shown in Figure 15, into or
through which notches or openings some of the glass of the cap will be pressed
when the said cap is blown out to the proper size.
Figures 8 and 9 illustrate the modification of my invention wherein I employ a

page_text: glass tube extending from side to side of the cap a and having the pin c
inserted in it and projecting from both sides of the cap, the said pin being secured
in the glass tubej by means of plaster or cement.
To provide for the attachment of the contact pieces or plates, to the glass
cap a, I sometimes make the closed end of the said cap with a recess or depression
in the shape of a cup and fill the said cup, as shown in Figures 10 and 11, with
plaster, cement or with a disc of insulating material which will fix the said contact
plates securely in place and insulate them from each other.
In other instances I form two or more recesses or depressions, as the case may
be, in the closed end of the cap a as shown in Figures 12 and 13, and secure
the said contact plates therein by cement or in any other convenient manner.
The said contact pieces or plates thus attached to the leading-in wires and secured
directly to the glass cap will bear against the spring contact pins in the bayonet-
joint holder when the glass cap is introduced into the said holder; the said plates
will then remain in contact with the spring pins notwithstanding the turning of
the cap to secure it in the holder, the said plates being firmly held in the recesses.
In making a lamp according to my invention I sometimes proceed as follows,
riz. I first make the glass cap a to the required form to join on to the neck of
the lamp, the leading-in wires b, being sealed in the said cap, and I mount the
lilament upon the leading-in wires; 1 then pass the filament through the neck
into the bulb, and then heat the edges of the cap and neck and weld or join the
two together. In other instances I make the collar or wall of the cap as a con-
tinuation of the bulb, I then insert the filament into the bulb, and close over the
top, sealing in the platinum conducting wires, and forming the recess or recesses
above described, thereby making a complete lamp of glass as described, the lamp
is then ready for exhausting. The contact pieces or plates are afterwards attached
to the leading-in wires and secured to the glass cap in the manner above described.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, 1 declare that what I
claim is :-
First. An electric glow-lamp adapted for use with a bayonet-joint holder, and
having formed integrally with the neck thereof a glass cap with a closed outer
end and to which the contact pieces or plates and the pins or studs for fitting into
the slots of the bayonet-joint are attached, substantially as herein before described.
Second. An electric glow-lamp having a glass cap formed integrally with the
neck thereof, and having a metal band or ring held in a groove in the said cap and
provided with pins or studs, substantially as and for the purposes above specified.
Third. An electric glow-lamp formed with a glass cap having a tube extending
across it in which a pin or rod is fixed so that the same projects from opposite sides
of the said cap, substantially as, and for the purposes, above specified.
Fourth. The glass cap having in its closed end a recess or recesses in which are
secured the contact plates attached to the leading-in wires, substantially as described
and for the purposes specified.
Fifth. The improved electric glow-lamp constructed substantially as described
with reference to either of the forms or modifications shown in the accompanying
drawing, and for the purposes specified.
Dinted the 20th day of Ind., 1806
D. YOUNG & Co.,
11 & 12, Southampton Buildings, London, W.C.. Agents for the Applicant.