Improved Means for Supporting and Connecting Arc Lamps and other Electrical Apparatus.
Year: 1898

page_text: PRACTICAL DICITIATION.
Improved Means for Supporting and Connecting Arc Lamps and other
Electrical Apparatus.
ALBERT LEWIS DAVIS, 68, Victoria Street, Westminster, Electrical Engineer,
do hereby declare the nature of this invention to be as follows:-
On a suitable base plate & insulated therefrom I mount a metal tube of con-
venient diameter to which one end of the supply main is attached, concentrically
with this tube & of larger diameter I mount another metal tube to which is
attached the other supply main, this outer tube is insulated from the inner tube
& from the base plate; the base plate is made of suitable shape to receive a pulley
in a manner such that one end of the suspension cord passing over the wheel will
pass through the centre of the inner tube being insulated therefrom by a plug
of fibre or suitable material, the whole may be suitably protected by a cover of con-
venient shape. Both the outer & inner tubes may receive one or more longitudinal
saw cuts to ensure better electrical contact with the movable plug. This movable
plug is attached to the suspension cord passing over the pulley in the above men-
tioned base plate, & consists of a hook or other suitable attachment on which is
mounted but electrically insulated therefrom a metal tube having an internal
diameter such that it may slide over the outside of the inner tube on the base
plate & make electrical contact with the former tube; concentrically with this
tube & insulated therefrom and of larger diameter, is placed another metal
tube the external diameter of the latter is arranged so that it may slide inside &
make electrical contact with the outer tube mounted on the base plate, both these
tubes on the movable plug are provided with suitable terminals for attachment to
the wires leading to the arc lamp or other apparatus attached to the plug. The
base plate may be fixed in any suitable position on the ceiling or on the end of
a bracket, or lamp post, & the movable plug carrying the lamp or other apparatus
may be raised into position by means of the cord passing over the pulley in the
base plate.
Total : 1
1000
Improved Means for Supporting and Connecting Arc Lamps and other
Electrical Apparatus.
ALBERT LEWIS DAVIS, 68, Victoria Street, Westminster, S.W.,
Electrical
Engineer, do hereby declare the nature of this invention and in what manner the
Price 8d.1

page_text: same is to be performed, to be particularly described and ascertained in and by
the following statement;-
On the accompanying sheet of drawings Fig. I gives a general view of the
fixed portion of the device in part section.
Fig. II shows the movable contact piece or plug in section.
Those parts performing similar functions being denoted by similar letters.
On a suitable base plate B, Fig. I, and insulated therefrom by a mica washer M,
or other suitable insulating material, I mount a metal tube T of convenient
diameter. The tube T may be attached to a metal flange piece l' provided with
a lug L serving the purpose of a terminal to receive one end of the supply main;
concentrically with the above tube T and of larger diameter 1 mount another
metal tube similarly mounted on a suitable flange piece F and provided with
a lug L' serving as a terminal to receive the other end of the supply main; this
outer tube T is insulated from the inner tube T by an annular air space formed by
the different diameters of the two tubes; the supporting flange piece being
insulated from the supporting flange piece F by a mica washer M, or other suit-
able insulating material, the bolts serving to hold the two flange pieces to the
base plate B, should also be electrically insulated from, both flanges by suitable
insulating bushes. The base plate B is made of suitable shape to receive a pulley
wheel P, Fig. I, in a manner such that one end of the suspension cord R passing
over the pulley wheel will pass through the centre of the inner tube 1 being
insulated therefrom by a tubular plug I of fibre or other suitable insulating
material. The whole may be suitably protected by a cover C of convenient shape.
Both the outer tube T and inner tube T may receive one or more longitudinal saw
cuts to ensure better electrical contact with the movable plug or contact piece,
Fig. II. This movable plug Fig. II is attached to the suspension cord R passing
over the pulley P in the before mentioned base plate B, Fig. I, and consists of a
hook H or other suitable attachment, on which is mounted but electrically insulated
therefrom by the insulating bush I, a metal tube T" having an internal diameter
such that it may slide over the outside of the inner tube T on the base-plate B,
Fig. I. and make 'electrical contact with the tube T. Concentrically with the
tube T and insulated therefrom by the insulating tube I' and insulating washer I",
and of larger diameter, is placed another metal tube T1; the external diameter
of this latter tube is arranged so that it may slide inside and make electrical con-
tact with the outer tube T mounted on the base-plate B, Fig. I. Both these
tubes T and T, mounted on the movable plug Fig. II, are provided with suit-
able terminals L" and L for attachment to the wires leading to the are lamp or
other apparatus attached to the plug.
The base-plate B Fig. I may be fixed in any suitable position on the ceiling
or on the end of a bracket, or lamp-post, and the movable plug Fig. II. carrying
the lamp or other apparatus may be raised into position by means of the cord R
passing over the pulley 1' on the base-plate B. The drawing shows the movable
plug lowered just out of contact with the base-plate supporting the contact tubes, T,
T, in which position all electrical communication between the lamp or other
apparatus attached to the movable contact piece or plug is cut off. When the
cord R is pulled it causes the movable plug to enter the annular space between
the two tubes T and T', and from the above description and drawing it will be evident
that electrical communication will take place between the ends of the supply mains
situated in terminals L L', and the leading in wires from the lamp or other
apparatus attached to the movable plug through the terminals L" L.
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 I claim
is:
I. The improved means for supporting and connecting are lamps and other
electrical apparatus herein described and figured in Figs. I and II on the accom-

page_text: panying sheet of drawings; consisting of the base B, pulley P, the flanged
pieces F, F, and terminals L L', in conjunction with their attached tubes T, 1,
and insulating bush I; and enclosing cover C. The insulated hook or attachment H
and its insulating bush I, the two attached tubes T T in conjunction with
the annular terminal pieces A¹ L", and A L, and the insulating tube or sleeve I¹,
and insulating washer I" substantially as described and for the purposes set forth.
II. The improved means for supporting and connecting arc lamps and other
electrical apparatus; consisting of the combination of the several parts herein
described and illustrated in Figs. I and II of the drawing herewith, substantially
as described and for the purposes set forth.
Dated this Sixth day of January 1800