IMPROVEMENTS IN HOLDERS FOR ELECTRIC INCANDESCENT OR GLOW LAMPS to.
Year: 1884

page_text: I, JOHN HAYTON GREENHILL, of Belfast, in the County of Antrim, Electrical
and Mechanical Engineer do hereby declare the nature of my invention for
IMPROVEMENTS IN HOLDERS FOR ELECTRIC INCANDESCENT OR GLOW LAMPS to.
be as follows:-
"
I employ a block of wood or other non-conducting material either cylindrical;
conical, square or oblong in shape. Projecting from the base of this block are two
separate supporting wings of sheet metal or other conducting or non-conducting
material, curved or hollowed at the ends against which the neck of the lamp abuts
or rests. Each of these supporting wings may, (if of metallic substance) or may
not be, electrically connected to each terminal screw. Instead of using helical
springs or rigid hooks to support the lamp, I employ two independent" trap";
springs, the one end of each being in electrical connection with the respective
terminal screw, while the other end of each spring projects slightly beyond the
block to permit the external loops of the lamp to readily engage with the springs,
and slip along them until where the projecting wings support the lamp, which is
thus securely held, while perfect electrical contact is made with the loops by reason
of the spring's pressure. To prevent the accidental contact of the springs with
each other, and thus causing "short-circuiting," I make.a horn or pin of insulating
material to project between the free ends of the springs.

page_text: COMPLETE SPECIFICATION.
I, JOHN HAYTON GREENHILL of Belfast; in the County of Antrim, Electrical &
Mechanical Engineer do hereby declare the nature of my invention for "IMPROVE-
"MENTS IN HOLDERS FOR ELECTRIC INCANDESCENT OR GLOW LAMPS" and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:—
I employ a block of wood or other non-conducting material either cylindrical,
square or oblong in shape. Projecting from the base of this block are two separate
supporting wings of sheet metal or other conducting or non-conducting material,
curved or hollowed at the ends against which the neck of the lamp abuts or rests.
Each of these supporting wings may, (if of metallic substance) or may not be
electrically connected to each terminal screw. Instead of using helical springs or
rigid hooks to support the lamp, I employ two independent "trap" springs, the one
end of each being in electrical connection with the respective' terminal screw, while
the other end of each spring projects slightly beyond the block to permit the
external loops of the lamp to readily engage with the springs, and slip along them
until where the projecting wings support the lamp, which is thus securely held,
while perfect electrical contact is made with the loops by reason of the spring's
pressure. To prevent the accidental contact of the springs with each other, and
thus causing short circuiting, I make a "horn" or pin of insulating material to
project between the free ends of the springs.
,
In order to more fully describe the mode of construction, I herewith annex.
drawings of the holders and springs.
"
Figs. A. A A A represent different views of the same holder, in which the
supporting wing for the lamp is made in a piece with the holder, and is of
non-conducting material. In this case the "trap". springs are connected to the
terminals.
t
:
.
Figs. B B B B may employ separate wings made of metal and each in connection
with the respective terminal, or these wings may also be in piece with the holder,
and of non-conducting material.
•
Figs. CCCC are similar to B BBB but have an insulating horn or pin between
the convolutions of the "trap-springs-as-an-additional precaution against-accidental
electrical contact between them.
Figs. D D D D shew a holder with projecting wires to abut against the neck of
the lamp in lieu of the "wings" previously illustrated.
Figs. E E E represent the "Trap" springs which engage with the loops of the
Lamps.
.
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
-
1. The application of "Trap" springs to holders, as shewn in the annexed
drawings.
Dated this 19th dow of March 1985