Improvements in or relating to Sockets or Holders for Incandescent Electric Lamps, and the Attachment of Lamps thereto.
Year: 1897

page_text: This Print is in accordance with the Original Specification as it stands after
Amendment (under Section 11 of the Patents, &c. Act, 1883) as required by
the decision of the Comptroller General of the 6th day of November 1897.
Date of Application, 6th May, 1897-Accepted, 12th June, 1897
Improvements in or relating to Sockets or Holders for Incandescent
Electric Lamps, and the Attachment of Lamps thereto.
A communication from EDUARD WORKINGEN, of the Firm Constantia Incan-
descent Lamp Manufactory, in Venloo, Kingdom of Holland.
I, ALFRED JULIUS BOULT of 111 Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, 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:-
Many attempts have been made to arrange the metal caps or sockets carrying
the parts of incandescent electric lamps which convey the current, in such a
manner that they may be changed or detached, when required. But in all the
arrangements hitherto known the metal parts are more or less fixed to or round
the glass of the bulb, so that the glass partially covers said metallic parts. These
methods of securing are effected almost without exception, in such a manner that
the glass of the bulb when in a plastic state is partially blown round said parts.
In all such constructions this produces the drawback that the metallic parts are
only loosely fixed to the glass and moreover the glass, in consequence of the
different coefficients of expansion of metal and glass easily bursts or breaks.
The object of the present invention is to produce a new method by which these
drawbacks are completely remedied, and consists in connecting the glass of a bulb
with the socket by a special springy intermediate piece which becomes firmly
secured to the glass as well as to the metal cap.
The device is represented in the accompanying drawing in which
Fig. 1 shows a bulb without its metal cap.
Fig. 2 shows a bulb with its cap.
Fig. 3 plan.
Figs. 4 and 5 are views of the cap from opposite sides.
The lamp bulb a has a head like piece b blown out with it having a neck or
reduced part between the head and the bulb proper. In the neck there are three
or other number of recesses & preferably arranged symmetrically. Round the neck
is placed a spring yoke or bande having bent parts or projections corresponding
to and engaging in the recesses d, so that the yoke cannot turn round. This yoke
is open on one side and is provided with extensions projecting outwards engaging
with holes or their equivalent, in the cap by which said yeke is secured to the
cap c. Fig. 2 shows how the yoke e engages with the openings fand in the metal
cap (Figs. 4 and 5).
The cap or socket c is securely mounted in the above manner on the glass bulb
and turning or falling out is impossible. When it is desired to move the cap from

page_text: the bulb, it is sufficient to press together the ends of the yoke e projecting through
an opening or slot in the cap, so that said ends may come out through the slot g
which is open at the bottom, after which the cap can be removed. No. tools are
therefore necessary either for connecting or for removing of the socket, and the
change is effected in a very simple and ready manner.
The conducting wires are connected to the metallic parts of the sockets in any
suitable manner.
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me by my foreign correspondent and in what manner the
same is to be performed, I would have it understood that I am aware that it has
been before proposed to use a spring yoke or band having inward projections enter-
ing corresponding recesses in the neck of incandescent electric lamp bulbs, and to
secure the socket or holder to such yoke or band, and I do not broadly claim any
such arrangement, I declare that what I claim is:-
1. A holder for electric incandescent lamps consisting of a socket provided
with the spring yoke e substantially as described, and shown in the accompanying
drawings.
2. The combination and arrangement of parts constituting the completo holder
for electric incandescent lamps, substantially as described and illustrated.in the
accompanying drawings.
Dated this 6th day of May 1897.
BOULT & WADE,
Agents for the Applicant..