Electric Lamps and for Analogous Purposes.
Year: 1884

page_text: Electric Lamps and for Analogous Purposes.
I, ALFRED SWAN of Low Fell Gateshead in the County of Durham Engineer,
do hereby declare the nature of said Invention for "IMPROVEMENTS IN CONTACT
MAKERS FOR THE HOLDERS OF INCANDESCENT ELECTRIC LAMPS AND FOR
ANALOGOUS PURPOSES to be as follows:-
"
My Invention relates more especially to the class of contact makers for the
holders of incandescent Electric lamps and for analogous purposes wherein split
screws or forked pieces are employed for the reception of the main wiros.
According to my Invention I provide spring attachments which are screwed or
fixed to tho said split screws or forked attachment or the like on the one part of
the holder or the like and give a spring bearing upon the wires or contact pieces of
the other part of the holder or the like.
The said spring attachments consist of an outer part formed with a screw socket
or equivalent means for fixing the said outer part to the split screw or forked piece
or the like. The said outer part contains an inner part consisting of a contact
piece projecting to outside the outer part and a collar or stop and also a con-
tinuation or guide piece, the said collar or stop and guide piece being situated in a
recess in the outer part so as to be capable of being depressed therein by means of
the projecting contact piece against the action of a spring bearing at one end
against a projection in the outer part or the bottom of the recess therein and at
the other end and against a projection on the inner part, which projection may be
the aforesaid collar or stop. The said spring encircles the said guide. The inner
part is retained in the outer part but with the contact piece protruding therefrom,
which retention may be conveniently effected by burnishing down the edge of the
recess in the outer part around the aforesaid collar or stop after the spring and
inner part are placed in the said recess. The exterior of the outer part is
preferably milled or is made of a hexagonal or equivalent form to enable the
attachment to be conveniently fixed upon the split screw or forked piece when this
is used.
The parts to which the said contact makers are applied may be of any convenient
shape and of any suitable description.

page_text: Electric Lamps and for Analogous Purposes.
I ALFRED SWAN of Gateshead in the County of Durham Engineer do hereby
declare the nature of my invention for "IMPROVEMENTS IN CONTACT MAKERS
FOR THE HOLDERS OF INCANDESCENT ELECTRIC LAMPS AND FOR ANALOGOUS
PURPOSES and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :—
"
My Invention relates more especially to the class of contact makers for the
holders of incandescent electric lamps and for analogous purposes wherein split
screws or forked pieces are employed for the reception of the main wires. I will
describe my Invention with reference to the accompanying drawing wherein
Figure 1 is a vertical section of my improved contact maker drawn to an enlarged
scale and Figure 2 is a section of an incandescent lamp holder with the said
contact maker applied thereto. According to my Invention I provide spring
attachments A which are screwed or fixed to the said split screws or forked
attachments a or the like on the one part of the holder or the like, and give a
spring bearing upon the wires or contact pieces b of the other part of the holder
or the like.
The said spring attachments consist of an outer part b' formed with a screw.
socket c or equivalent means for fixing the said outer part b¹ to the split screw or
forked piece a or the like-The said outer part contains an inner part d consisting
of a contact piece projecting to outside the outer part b' and a collar or stop d³ and
also a continuation or guide piece d³ the said collar or stop and guide piece being
situated in a recess b' in the outer part b¹ so as to be capable of being depressed
therein by means of the projecting contact piece d against the action of a spring e
bearing at one end against a projection in the outer part or the bottom of the recess
therein and at the other end against a projection on the inner part which projection
may be the aforesaid collar or stop as shewn in the drawings The said spring e
encircles the said guide d³ The inner part d is retained in the outer part but with
the contact piece protruding therefrom which retention may be conveniently
effected by burnishing down the edge of the recess in the outer part b' as shown
at b³ around the aforesaid collar or stop after the spring and inner part are placed
in the said recess-The exterior of the outer part 6' is preferably milled or is made
of a hexagonal or equivalent form to enable the attachment to be conveniently
fixed upon the split screw or forked piece when this is used.
The parts to which the said contact makers are applied may be of any convenient
shape and of any suitable description and I do not in any way limit myself to the
precise form or construction of these parts as shewn in the drawings.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
A contact maker consisting of an outer part 61 which can be fixed on one part
of the lamp or the like to the forked pieces or split screws which receive the main

page_text: wires in combination with an inner part d provided with means for retaining it in
the outer part and for pressing it outwards so that it is capable of being pressed
inwards to give a good contact or spring bearing of the inner part with the
contact pieces on the other part of the lamp or the like substantially as herein-
before described with reference to the accompanying drawings.
Dated the tenth day of August 1885