Improvements in Fittings for Electric Lights.
Year: 1892

page_text: Date of Application, 10th May, 1892
Complete Specification Left. 10th Feb., 1893-Accepted, 18th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in Fittings for Electric Lights.
I, JOHN SMALLWOOD of Cubitt Town, Poplar, Middlesex, Electrical Engineer
do hereby declare the nature of this invention to be as follows:-
According to this invention a suitable insulating rod is provided which is fitted
internally with two conductors which make contact with two contact clutches
fastened to a suitable holder made of insulating material and provided with an
adjustable collar which serves to keep the holder in position and ensures perfect
contact between the conductors and contact clutches. The insulating rod is provided
with a suitable single or double pole safety fuse.
Dated this 10th day of May 1892
ELT & Co.,
33, Southampton Buildings, Holborn, London, Agents for Applicant.
COMPLETE SPECIFICATION.
Improvements in Fittings for Electric Lights.
JOHN SMALLWOOD, Cubitt Town, Poplar, Middlesex, Electrical Engineer 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:-
This invention has for its object to provide means for the ready adjustment
of electric lights and also to dispense with the slack wire which has hitherto
heen requisite to allow of such adjustment and which is unsightly inconvenient
and expensive.
To carry out my invention I make an insulating rod of any suitable material
and of any convenient shape and dimensions, having therein two grooves or
channels each fitted internally with a contact plate or conductor. These contact
plates or conductors make contact with two contact clutches that are screwed or
otherwise fastened to a nut made of any suitable insulating material which is
rigidly fixed on one end of the stem of a suitable electric lamp holder and pre-
ferably threaded as shewn in the accompanying drawings. This nut is provided
with an adjustable collar that fits over and works to and fro thereon.
By inserting the contact clutches into the grooves in the insulating rod and
moving the nut either to or fro the. lamp can readily be adjusted in any
required position and secured therein by tightening up the collar on the nut.
To ensure greater firmness and rigidity of union between the insulating nut and
the insulating rod the head of the nut may be recessed so as to fit over the
central rib of the rod the latter thus forming a guide whereby to fix the nut in
position. When it is desired to alter the position of the lamp it is only necessary
to loosen the collar so as to allow of shifting the lamp by moving the nut to
or fro and then again fixing the lamp in position by tightening up the collar
in the manner already described. Or the nut and collar may be fitted together
by means of a bayonet joint or in any other convenient manner.
The conducting wires through which the electric current is supplied are
brought up under the heads of the screws that fix the contact clutches in position.
Perfect contact is ensured between the clutches and the contact plates or
conductors by the action of tightening up the adjustable collar whereby the

page_text: clutches are pressed against the contact plates thus creating and maintaining
perfect contact.
The insulating rod is provided with a single or double pole safety fuse which
is countersunk therein so as to be flush with the surface of such insulating rod.
If desired two three or any other convenient number of such insulating rods
may be employed.
Figure 1 of the accompanying drawings shews a perspective elevation of one
form of an insulating rod made according to my invention. a is the rod a' the
grooves or channels therein. the contact plates fitted in such grooves and
g the double pole safety fuses.
Figure 2 shews a side view of the insulating nut d with adjustable collar e
and contact clutches c screwed thereto. The nut is recessed on each side to
receive such contact clutches. f is the stem of the lamp holder which is shewn
broken off.
Figure 3 is a plan view shewing the contact clutches c in position in the grooves
or channels a' and the contact plates or conductors 6 fitted in such grooves. The
adjustable collar e is shewn loose in this figure.
I would here observe that I do not confine myself to the precise mechanical
details herein before described and shewn as the same admit of modifications in details
without departing from the essential features of my invention which are Firstly one
or more grooved insulating rods each fitted with suitable contact plates or con-
ductors. Secondly one or more electric lamp holders each provided with an
insulating nut having an adjustable collar and suitable contact clutches attached
thereto and Thirdly the combination of such rod or rods with such holder or holders
substantially in the manner herein before described and shewn.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what 1
claim is
1. In combination with one or more electric light fittings one or more insulating
rods each having suitable grooves formed therein which grooves are fitted with
contact plates or conductors all substantially as hereinbefore described and
shewn.
2. In combination with an electric lamp holder an insulating nut fitted with an
adjustable collar and with suitable contact clutches all substantially as hereinbefore
described and shewn.
3. In electric light fittings the combination of one or more grooved insulating rods
each furnished with suitable .contact plates or conductors with one or more lamp
holders each fitted with an insulating nut furnished with an adjustable collar and
having suitable contact clutches attached thereto all substantially as herein before
described and shewn.
D
1
1
1000
ELT & Co.,
33, Southampton Buildings, London, Agents for Applicant.