Improvements in the Construction of Spring Buffer Connections for the Holders of Electric Lamps.
Year: 1893

page_text: Date of Application, 7th Mar., 1893-Accepted, 19th Aug., 1893
COMPLETE SPECIFICATION.
Improvements in the Construction of Spring Buffer Connections for
the Holders of Electric Lamps.
I, EDWARD LIONEL JOSEPH, of 92 Queen Victoria Street, in the City of
London, Engineer and Electrician, 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, reference being had to the
accompanying sheet of drawings and to the letters and figures marked thereon, that
is to say :-
In the well known spring buffer connections for the holders of electric lamps,
heretofore in use, it has been customary, according to one arrangement, to secure
the connection to the earthenware or other insulating stand by means of one or
more screws passing through a hole or holes in the said stand from the opposite
side thereof screwing into the metal of the connection; or according to another
arrangement, the connection is secured by a screw passed through it before the
spring buffer is put into place into a threaded hole moulded in the earthenware
stand. The first mentioned arrangement is objectionable by reason of the danger
of short circuiting through the screws at the back by moisture or by contact of the
conductors, and the second mentioned arrangement is objectionable by reason of the
difficulty of putting together the parts of the connection and taking them to pieces
when desired.
The object of the present invention is to provide a connection which shall be
free from the abovementioned objections, and for this purpose I employ the
arrangement shown in the drawings in which
Figure 1 is a sectional elevation of so much of an electric lamp holder with
spring buffer connections as is necessary to elucidate our invention.
Figure 2 is an underside view of the earthenware or other insulating stand
separate from the holder.
Figure 3 is a sectional elevation taken on the line X X of Figure 2 with the
parts separated, and
Figure 4 an elevation with the parts in place.
A is the lamp holder with bayonet joint B for the attachment of the lamp in
the usual way. C is the earthenware or other insulating stand on which the spring
buffer connections are secured. These latter are constructed as follows:-D is a
recess forined in the stand C and shaped to receive the base of the small connecting
piece E. A hole F in this piece E coincides with the hole G in the stand C and
one of the conducting wires H passes through the hole G into the hole F and is
clamped in the latter by the clamping screw I. A hole J in the base of the piece E
coincides with a threaded hole K moulded or otherwise formed in the stand C.
L is the spring buffer case formed with a screw stud or stem M adapted to screw
into the hole K in the stand C. N is the contact buffer retained in the case L by
a shoulder O in the usual way, and P is the spring which constantly urges it
outwards. It will now be understood that the piece E being placed with its base
in the recess D in the stand C the spring buffer case L with the contact buffer N
and its spring P in place is screwed, by its screwed stud M (which passes through
the hole J in the piece E) into the screwed hole K in the stand C until the
shoulder L of the spring buffer case L comes to bear against the base of the
piece E, thereby securing the same firmly in place in the recess D in the stand C.
The conducting wire H is then passed through the hole G into the hole F and is
clamped therein by the screw I. When it is required to take the connection to
pieces, it is only necessary to unscrew the clamping screw I whereby the conducting
wire H is released, then unscrew the spring buffer case L from the stand C and the

page_text: connecting piece E can then be removed from the recess D in the stand C. The
construction of the other connection E¹ L' N¹ is exactly similar to that above
described, the conducting wire H' being connected to the piece E' in the same way
as the wire H to the piece E.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
:-
The improved spring buffer connection for electric lamps which consists of a
contact piece E provided with means for the clamping thereto of the conducting
wire, and the spring contact buffer case L having a screwed stud or stem M adapted
to screw into a threaded hole in the earthenware or other insulating stand C and to
thereby secure itself together with the contact piece E in position on the said
stand, substantially as hereinbefore described, and illustrated in the drawings.
Dated this Sixth day of March 1893.
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E. L. JOSEPH,
Per W. H. Beck,
115, Cannon Street, London.
E. L. JOSEPH,
Per W. H. Beck,
115, Cannon Street, London.