China or Porcelain Cap or Socket for Incandescent Electric Lamps.
Year: 1889

page_text: Date of Application, 7th Feb., 1889
Complete Specification Left, 31st Oct., 1889-Accepted, 21st Dec., 1889
PROVISIONAL SPECIFICATION.
China or Porcelain Cap or Socket for Incandescent Electric Lamps.
I, EDWARD WILLIAM LANCASTER, of Albart Works Graham Street Birmingham
in the county of Warwick, Electrical Engineer do hereby declare the nature of this
invention to be as follows:-
A china or porcelain cap or socket for Incandescent Electric lamps, to be used in
place of vitrite metal and plaster, or other materials or substances.
The cap may be inade of any suitable form, to the requirements of the various
lamps and holders, either by moulding, turning or stamping with dies, the clay to the
forin required before the firing of the clay.
The cap may he fixed to the lamp with suitable cement or plaster or the glass
forming the top of the lamp may he first melted into the cap during the
manufacture of the lamp, in either case proper provision being made for the terminal
contacts.
Datel this Fourth do 130
COMPLETE SPECIFICATION.
China or Porcelain Cap or Socket for Incandescent Electric Lamps.
I EDWARD WILLIAM LANCASTER of Albert Works, Birmingham, Warwickshire
England 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 :-
My invention consists in making the caps or sockets for incandescent lamps of
china porcelain or earthenware instead of vitrite or metal and plaster as usually
employed. By my invention the said Cap or Socket holders are prevented from
becoming heated, are good insulators and are not liable to break in fixing or when in
use. I make the said Caps or Sockets of any suitable form to suit the requirements
of the Lamps and holders either by moulding the clay to the required form or by
turning it, or preferably by stamping it in dies and then firing or baking it in the
usual manner as employed for other articles of pottery ware.
On the accompanying drawing Fig. 1 represents in elevation and plan and Figs. 2
&B in sectional elevation, an incandesdent lamp having a cap or socket constructed
according to my invention, Figs. 4 and 5 illustrate in sectional elevation and in plan
another sample of the said cap or socket and Figs. 6 and 7 illustrate further
examples of the same. Figs. 9 and 10 illustrate the method of finishing the
connections and terminals.
The same reference letters indicate the same or corresponding parts in all the
figures.
A is the said cap or socket which according to this invention, is made of china,
porcelain or earthenware, and B is the glass part of the Lamp to which the cap or
socket A is secured.
The cap or socket A is provided with two holes marked C and C for the terminal
contacts and is hollowed at D for the upper part of the Lamp to fit in, where it is
secured by suitable cement or plaster.
The hollow underside of the lamp or socket may be recessed out at D. as shewn
by Fig. 6 so that the glass forming the top of the lamp may be melted into the cap
or socket during its manufacture. The outside of the cap or socket A is made of
suitable size for the holder for which it is to be attached and may be provided with a
ranverse hole E. into which fits a pin F. or the hole may be substituted by a
[Price 6d1

page_text: projection F. Figs. 8 and 9 to engage with bayonet sluts in the holder in the usual
manner, or the cap may be provided with a bayonet slot and the pins project in the
holder. The method of mounting the Lamps to the china caps, is by first soldering
two copper wires (which may first be tinned) to the eyes or platinum terminals
of the Lamp. The cap is then filled with cement and passed over the wires on to
the Lamp.
The wires may then he turned round in a coil, as shown at (" and (8, Figs. 8 so
as to lio flat in the hole provided and afterwards filled up with solder or the
terminal may be finished by inserting a thick metallic washer of any desired shape
over the wire with a slot as shewn at G. Fig. 9 and by lending the wire down
into the slot and then soldering it or a metallic pieco may be inserted as in Fig. 10
and soldered in the same manner as in Fig. 9.
Having now particularly described and ascertained the nature of my said Invon-
tion, and in what manner the same is to be performed 1 declare that what I
claim is :
1st. Making the caps or sockets for incandescent electric lamps of china, porcelain,
faience or earthenware substantially as hereinbefore inentioned.
2nd. The combination with an incandescent lamp of a porcelain, china, or
earthenware socket secured thereto and provided with holes for the terminal contacts
and the method of contact, and with or without a tranverse hole, and fixing piece
or bayonet slot as substantially hereinbefore described and illustrated.
3rd. The method of connecting the Lamp to the socket and the manner of contact
as hereinbefore described and illustrated.
Dated this 28th day of October 1889.