Improvements in Electrical Glow Lamp Fittings.
Year: 1898

page_text: Date of Application, 9th Dec., 1898-Accepted, 21st Jan., 1899
COMPLETE SPECIFICATION.
Improvements in Electrical Glow Lamp Fittings.
We, SIEMENS BROTHERS & CO. LIMITED, of 12, Queen Anne's Gate, Westminster,
S.W., Electrical Engineers, do hereby declare the nature of this invention (as
communicated to us from abroad by Siemens & Halske Aktien Gesellschaft, of
Markgrafen Strasse, No. 94, Berlin, S.W., Electrical Engineers) and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement: —
This invention relates to an improved construction of electrical glow lamp fitting
which we will describe in connection with the accompanying drawing, in which
Fig. 1 shews the external conducting socket detached, Fig. 2 shews the same with
the internal fittings and Figs. 3, 4, 4, and 5 shew detached views of the internal
fittings.
The external socket H is generally of that type into which the base of the glow
lamp is fixed by screwing, thereby forming the conducting connection to the outer
pole, while the connection to the inner pole is effected by an insulated contact piece
within the socket.
The present invention relates to the mode of fixing the said inner contact piece
in the socket and also to hold together without screws the parts constituting the
insertion block which is built up of conducting and insulating pieces, secured
together by a clamping action thereby preventing all shifting.
The insertion block is for this purpose built up of the two similar glass plates G G
Figs. 4 and 4, and the metallic contact piece shewn at Fig. 5. This contact
piece is of sheet metal bent up in box form, and has at the top the contact stud C
and at one side the clamping screw S for the one lead.
Notches E E formed at the four vertical edges produce the projections which
fit into the notches R_R in the glass plates G G, so that when these latter are
fitted into the notches E E of the contact piece as at Fig. 3 and are pressed towards
each other, they form with the contact piece the combined insertion block at
Fig. 3.
The socket H Fig. 1 has openings on the two opposite sides having a con-
figuration corresponding exactly to that of the insertion block; the projecting
tongues being in the first instance bent outwards as shewn at Fig. 1 so as to
allow the insertion block to be slid transversely into the socket.
Owing to the notched parts e e of the glass plates G G being formed with
founded surfaces corresponding to the internal cylindrical surfaces of the socket,
the insertion block can after its introduction into the socket as described be slid
downward therein to an extent corresponding to the depth of the lower notches e e
and the insertion block is thus secured against lateral shifting; the tongues ll
being then bent inwards again, as shewn at Fig. 2, so as to project over the
tongues V, the block is also secured against vertical shifting. The clamping screw
on the socket H for the second lead is assumed to be on the side of the socket
furthest away from the observer.

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
1. A glow lamp fitting with outer conducting socket and inner contact piece,
wherein an insertion block carrying the inner contact piece in an insulated manner
is introduced into the socket through lateral openings, and after being pushed
down therein so as to be prevented from lateral shifting, is also prevented from.
vertical shifting by means of projecting tongues on the socket substantially as
described.
2. In a glow lamp fitting such as is referred to in the first claim, constructing
the insertion block of two insulating plates engaging the two opposite notched
sides of the contact piece formed of bent sheet metal, substantially as and for the
purposes described.
n
11
Out 1
Than 1000