Improvements in Electric Incandescence-lamps.
Year: 1897

page_text: PROVIDIONAL DILUIFICATION.
Improvements in Electric Incandescence-lamps.
I, FRIEDRICH EGGER, of Jodenstraat, Venloo, Holland, Engineer, do hereby
declare the nature of this invention to be as follows:-
-
The desire to provide for electric incandescence-lamps a fastening capable of
being undone, is due to the drawbacks resulting from the manner in which the
socket is at present almost exclusively connected with the glass bulb, namely by
means of plaster of Paris and cement.
It is well known that the glass parts are frequently caused to crack in conse-
quence of the unequal expansion of metal and glass on heating. But the construc-
tions which have for object to effect a removable connexion between the bulbs and
the socket, are all affected by the same drawback which is caused by a rigid con-
nexion of these two parts with each other.
In, this case also the unequal expansion of metal and glass has its injurious
effect because the connecting part itself is a ring which extends around the whole
periphery. The removability of the connexion is in that case of no value because
by the rigid pressure of the ring upon the entire periphery of the bulb, the same
drawback remains operative as in the case where the socket is rigidly connected
to the glass-part.
Now the present invention has for object to produce a connexion between
the socket and the bulb in such a manner that first of all the area of contact.
between the metal parts and the glass parts shall be reduced to a minimum, and
secondly, by the arrangement of the connecting part, the advantage shall be
gained that the unequal expansion of the metal and the glass shall have no effect,
because the expansion of the metal parts will take place only in one direction and
not along the periphery of the glass part.
Fig. 1. of the accompanying drawings is a perspective view, and Fig. 2 is lon
gitudinal section, of a bulb secured to a socket according to this invention.
The bulb a is provided at its socket-end with two recesses or grooves b, and
has otherwise exactly the shape of the ordinary incandescence-bulbs. The socket c
is formed with holes d which are so arranged as to be situated in line with the
recesses or grooves in the glass bulb when the latter is inserted in the socket.
The connexion between the socket c and the bulb a is now effected by means of a
wire or pin e (or pins), which is introduced through the holes d in the socket, so
that it lies in the grooves in the bulb. Then the two ends of the inserted pin or
wire (or pins) are nipped off.
This connexion, as will be obvious, prevents the socket from being twisted
relatively to the glass bulb. Furthermore, when the incandescence lamp becomes
hot, the injurious effect of the unequal expansion of the metal and the glass cannot
take place, because the expansion of the wire or pin (or pins) e, which alone could
have any effect, takes place only in a longitudinal direction and is quite inde-
pendent of the expansion of the glass part.
This construction also possesses the peculiarity that it is suitable without modi-
fication for use with every heretofore used kind of incandescence-lamps. All

page_text: that is necessary is to punch a number of correspondingly arranged holes in the
socket part.
The mounting and dismounting of the arrangement is easily done without fur-
ther trouble, whilst obviously each separate part can be readily used over and over
again to an extraordinary extent in contradistinction to the arrangements hereto-
fore known.
I, FRIEDRICH EGGER, formerly of Jodenstraat, Venloo, Holland, but now of
18, Halleschestrasse, Berlin, S.W., Germany, 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 desire to provide for electric incandescence-lamps a fastening capable of
being undone, is due to the drawbacks resulting from the manner in which the
socket is at present almost exclusively connected with the glass bulb, namely by
means of plaster of Paris and cement.
It is well known that the glass parts are frequently caused to crack in conse-
quence of the unequal expansion of metal and glass on heating. But the construc-
tions which have for object to effect a removable connexion between the bulbs and
the socket, are all affected by the same drawback, which is caused by a rigid con-
nexion of these two parts with each other.
In this case also the unequal expansion of metal and glass has its injurious
effect because the connecting part itself is a ring which extends around the whole
periphery. The removability of the connexion is in that case of no value because
by the rigid pressure of the ring upon the entire periphery of the bulb, the same
drawback remains operative as in the case where the socket is rigidly connected
to the glass part.
Now the present invention has for object to produce a connexion between
socket and the bulb in such a manner that first of all the area of contact
between the metal parts and the glass parts shall be reduced to a minimum, and,
secondly, by the arrangement of the connecting part, the advantage shall be
gained that the unequal expansion of the metal and the glass shall have no effect,
because the expansion of the metal parts will take place only in one direction and
not along the periphery of the glass part.
Fig. 1. of the drawings filed with my Provisional Specification is a perspective
view, and Fig. 2 is a longitudinal section, of a bulb secured to a socket according
to this invention.
The bulb a is provided at its socket-end with two recesses or grooves b, and
has otherwise exactly the shape of the ordinary incandescence-bulbs. The socket c
is formed with holes d which are so arranged as to be situated in line with the
recesses or grooves in the glass bulb when the latter is inserted in the socket.
The connexion between the socket c and the bulb a is effected by means of a
wire or wires c which or each of which is introduced through the holes d in the
socket, so that it lies in the grooves in the bulb. Then the two ends of the inserted
wire or each wire are secured in place, as by twisting them together, and nipped off.

page_text: This connexion, as will be obvious prevents the socket from being turned
relatively to the glass bulb. Furthermore, when the incandescence-lamp becomes
hot, the injurious effect of the unequal expansion of the metal and the glass cannot
take place, because the expansion of the wire or wires e, which alone could
have any effect, takes place only in longitudinal direction and is quite inde-
pendent of the expansion of the glass part.
This construction also possesses the peculiarity that it is suitable without modi-
fication for use with every heretofore used kind of incandescence-lamps. All
that is necessary is to punch a number of correspondingly arranged holes in the
socket-part.
The mounting and dismounting of the arrangement is easily done without fur-
ther trouble, whilst obviously each separate part can be readily used over and over
again to an extraordinary extent in contradistinction to the arrangements hereto-
fore known.
-
Having now particularly described and shown the nature of the said invention
and in what manner the same is to be performed I declare that what I claim is:-
1. The fastening of the bulb a of an electric incandescence-lamp to its socket c
by means of a wire or wires e, which or each of which is passed through holes d in
the socket c and engage in corresponding recesses 6 in the bulb a substantially as
described and shown.
oul 1
1900