IMPROVEMENTS IN INCANDESCENT ELECTRIC LAMPS AND THEIR HOLDERS OR SUPPORTS "
Year: 1883

page_text: LETTERS PATENT to Alfred Swan of the Borough of Gateshead in the County
of Durham for an Invention of "IMPROVEMENTS IN INCANDESCENT ELECTRIC
LAMPS AND THEIR HOLDERS OR SUPPORTS
"
PROVISIONAL SPECIFICATION left by the said Alfred Swan at the Office of
the Commissioners of Patents on the 30th October 1883.
ALFRED SWAN of the. Borough of Gateshead in the County of Durham
"IMPROVEMENTS IN INCANDESCENT [ELECTRIC] LAMPS AND THEIR HOLDERS OR
SUPPORTS
"
My Invention consists firstly in providing at or about the nock of the globe or
bulb of the lamp grooves or ribs or depressions or projections and upon the holder
or support springs which engage with the said grooves or ribs or depressions or
projections so as to retain the globe or bulb in place in the holder or support. The
said springs may themselves be of an ornamental character or they may be
concealed by or contained within an ornamental part of the holder. The terminal
wires may be connected to the conducting parts of the holder either by the loops
thereof being secured between jaws therein as described in the Specification of my
Patent 2528 A.D. 1883 or the wires may simply project and be held between such
jaws or between or against any other conductor. Where the fastening described in
my said Specification is employed the tail ends of the springs or one or more of
them arranged as herein before described may be utilized as the springs for retaining
the parts of the holder together according to my said prior Specification. Where
the terminal wiros project at the side of the neck of the bulb they may be brought
into contact with two of the retaining springs which will form a part of tho
conducting circuit.
According to another arrangement where the terminal wires project from the
side of the neck of the bulb I form them in loops and attach spiral springs thereto
which are at their other ends connected to a piece which forms one part of a
bayonet joint-like fastening the other part of the fastening being formed by the
part attached to the lamp so that when the one part is slidden into the other either
one or the other of the parts may be turned partly round to secure the parts
together the locking in position being conveniently offected by recesses in which
the projecting parts of the fastening are retained by the action of the coiled
springs

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Alfred Swan in the Patent Office on the 29th April 1884.
ALFRED SWAN of the Borough of Gateshead in the County, of Durham
"IMPROVEMENTS IN INCANDESCENT ELECTRIC LAMPS AND THEIR HOLDERS OR
SUPPORTS
"
My Invention consists firstly in providing at or about the neck of the globo or
bulb of the lamp grooves or ribs or depressions or projections and upon the holder
or support springs which engage with the said grooves or ribs or depressions or
projections so as to retain the globe or bulb in place in the holder or support. The
said springs may themselves be of an ornamental character or they may be
concealed by or contained within an ornamental part of the holder. The terminal
wiros may be connected to the conducting parts of the holder either by the loops
thereof being secured between jaws therein as described in the Specification of my
Patent No 2528 A.D. 1883 or the wires may simply project and be held between
such jaws or between springs or against any other conductor-Where the fastening
described in my said Specification is employed the tail ends of the springs wherein
the terminal wires are held or one or more of them may be utilized as the springs
for retaining the parts of the holder together according to my said prior Specification.
Where the terminal wires project at the side of the neck of the bulb they may be
brought into contact with two of the retaining springs which will form a part of
the conducting circuit.
According to another arrangement where the terminal wires project from the
side of the neck of the bulb I form them in loops and attach spiral springs thereto
which are at their other ends connected to a piece which forms one part of a
fastening somewhat like a bayonet joint fastening, the other part of the fastening
being formed by the part attached to the lamp so that when the one part is slidden
into the other either one or the other of the parts may be turned partly round to
secure the said parts together the locking in position being conveniently effected
by recesses in which the projecting parts of the fastening are retained by the
action of the spiral-springs.
And in order that my said Invention may be fully understood I shall now
proceed more particularly to describe the same and for that purpose shall refer
to the several figures on the annexed sheet of drawings the same letters of reference
indicating corresponding parts in all the figures.
3
Figure 1 ropresents in vertical section a holder or support and bulb. or globe
arranged or constructed according to my Invention. Figure 2 is a plan of the
same with the upper part of the holder removed. The bulb A has a groove or
recess formed in the neck part at a and the holder B has attached to it springs b
which engage with the said groove or recess a and thereby firmly retain the bulb
in position. The terminal wires c are preferably engaged with the conducting. 4
parts of the holder by being passed between or against springs or spring clips d.
The holder may be of any suitable shape or construction. In the drawing I have
shewn it as being constructed in two parts after the manner described in the
Specification of my Patent N° 2528 dated 21 May 1883. The springs & however
will in this caso answer the purpose of springs for retaining the one part of the 4
holder in place in the other part and the contact parts at e may therefore if desired
be rigid instead of in the form of springs as described in ny said foriner
Specification. In securing the. bulb to the holder the neck of the said bulb has
simply to be passed in between the springs b the said springs yielding to allow of
its passage and when it has been fully pressed home the said springs will engage 5
in the recess or groove a and securely hold it in position the contacts being mado

page_text: by the terminal wires c passing between the parts of the springs d. The springs b
may themselves be of an ornamental character or they may be concealed by or
contained within an ornamental part of the holder as illustrated in Figure 3
wherein the said springs b are covered or concealed by a part or continuation B' of
the holder which part may be ornamented in any desired way. The terminal
wires c may be formed in loops instead of straight as shewn in the drawing and
be secured by being nipped between jaws as described in the Specification of my
said prior Patent or they may be arranged in any other desired way that will give
a proper contact with the conducting parts. Figure 4 is a vertical section of a
lamp holder and bulb shewing the application of my Invention to a bulb wherein
the terminal wires o project from the said bulb at the side of the neck thereof. In
this case tho said wires may be formed into loops or knobs c which engage in
corresponding recesses in two of the springs b which form a part of the conducting
circuit. This arrangement is shewn as applied to a holder which is simply secured.
by screwing to a tube through which the conducing wires pass. Figure 5 is an
inside plan of the holder with the bulb removed. If the loops or knobs of the
terminal wires give a sufficient hold for the springs the bulb need not be formed
with a groove rib or depression or projection for the engagement of the springs but
to ensure a firm hold it will be preferable to form the springs and bulb as herein-
before described. In order to prevent the bulb or globe from being rotated in the
holder projections may be formed on or attached to the bulb or globe against which
the sides of the springs bear. The same object may of course be attained by making
the depressions in the globe or bulb of a shapo to merely receive the springs instead
of in the shape of circular grooves.
It is to be understood that I do not limit myself to the number form or size of
the depressed or raised parts in the bulb nor to the number or shape of tho
retaining springs employed. For example there may be one or more only of the
parts which engage with the bulb made as a spring or springs the other or others
being rigid retainers against which the spring or springs press the bulb to retain it
in position.
According to a further modification of my Invention in cases where the terminal
wires project as loops from the side of the neck of the bulb I attach springs to
the said loops as illustrated in Figure 6 the other ends of the said springs being
secured to a central pieco G with car pieces g. This part G is shown separately in
plan in Figure 7. It may be secured to the electrolier or bracket or other place
in any desired way for example the piece G may be formed as one of the parts of a
fastening such as is described in the Specification of my aforesaid prior Patent.
The covering or receiving part H (shewn in plan of top side in Figure 8) has a
hole therein at the sides of which are formed passages h³ for the ear pieces g and
recesses for their reception when the parts are fastened together which fastening
is effected by passing the piece G (when attached to the bulb as shewn) through
the hole h the ear pieces g passing through the passages h³. The part G or H is
then turned a part of a rotation when the ear pieces g are brought into the
recesses with which they engage the springs f retaining them in position. The
part H may have grooves on its interior for the reception of the projecting portions
that is to say the loops of the terminals and the ends of the springs engaged
therowith.
Having now described and particularly ascertained the nature of my said
Invention and the manner in which the same is or may be used or carried into
effect I would observe in conclusion that what I consider to be novel and original
and therefore claim as the Invention secured to me by the herein before in part
recited Letters Patent is :-
First As a means of securing incandescent electric lamps in their holders or.
supporters the combination of a globe or bulb formed with grooves or ribs or
projections or depressions and a holder or supporter provided with a spring or
springs for engaging with the said grooves ribs projections or depressions
substantially as hereinbefore described.

page_text: Second In combination with a holder for retaining the bulb or globe as claimed
in the preceding claiming clause the springs d for receiving the terminal wires for
anaking contact substantially as herein before described.
:-
Third The arrangement or combination of parts constituting the electric
lamp and holder herein before described and illustrated in figure 1 of the
accompanying drawings.
Fourth-The arrangement or combination of parts constituting the electric lamp
and holder herein before described and illustrated in Figure 3 of the accompanying
drawings.
Fifth The arrangement, or combination of parts constituting the electric lamp
and holder herein before described and illustrated in Figure 4 of the accompanying
drawings.
Sixth-As a means of securing incandescent electric lamps in their holders or
supporters the combination of springs fa piece G and a covering or receiving part
all arranged constructed and combined substantially as hereinbefore described with
reference to figures 6, 7 and 8 of the accompanying drawings.
In witness whereof I the said Alfred Swan have to this my Specification set
my hand and seal this fifth day of April One thousand eight hundred and eighty
four,