Improvements in Pillars and Electroliers or Pendants for Electric Lamps.
Year: 1890

page_text: Date of Application, 9th Oct., 1890
Complete Specification Left, 9th July, 1891-Accepted, 29th Aug., 1891
PROVISIONAL SPECIFICATION.
Improvements in Pillars and Electroliers or Pendants for Electric
Lamps.
WC, RICHARD BROWN EVERED, of the firm of Evered & Co., of 27 Drury
Lane, in the County of Middlesex, Brassfounder, and THOMAS RUDLING, of
47 Parma Crescent, Lavender Hill, in the County of Surrey, Electrician, do
hereby declare the nature of this invention to be as follows:-
Our invention relates to pillars and pendants for electric lamps and is designed
to provide for raising and lowering the lamp or lamps while maintaining the
electrical connections unbroken.
Our said pillar or pendant comprises an outer tube and an inner tube, the latter
being constructed to slide freely within the outer tube and to be secured in any
desired position therein by a pinching screw or equivalent device. The said outer
tube is provided with feet by which it may stand on or be fixed to the floor or with
ceiling plates for attachment to the ceiling. Stops may be provided on the inner
tube to limit the extent of its sliding movement.
We line the said inner tube with
any suitable electric insulating material and we secure along the inner face of the
said insulating material two narrow metallic strips which extend from end to end
of the tube or for any desired shorter distance. The said strips are insulated from
cach other and from the inner sliding tube by the said insulating material upon
which they are fixed. We next provide a rod of wood or other suitable electric
insulating material, and of convenient diameter for passing freely through the
aforesaid sliding inner tube and we let into the said rod two longitudinal strips of
metal forming electric conductors, insulated from each other. The said strips are
preferably bowed at one end to secure a spring like action when the rod is placed
within the sliding tube causing the strips to press against the insulated metallic
strips within the said sliding tube and thus make an electric connection therewith.
The upper end of the said inner rod in the case of a pendant, or the lower end in
the case of a pillar is secured by a suitable insulated connection to the outer
stationary tube and therefore remain stationary while the inner sliding tube may be
moved up and down, and during such movement there is maintained a sliding
contact between the two sets of metallic strips, which ensures the continuity of the
electric connections.
It is necessary to prevent rotation of the sliding tube and for this purpose we
may provide it with one or more longitudinal ridges or feathers, extending from
end to end, which fit into corresponding internal grooves preferably formed in a
collar secured to the end of the outer tube.
The lamp fixtures or brackets are attached to the projecting end of the sliding
tube and the required electric connections are made by suitable insulated wires
coupled to the lamp or lamps and to two strips of metal fixed in a plug of
insulating material constructed to enter the sliding tube for a short distance
sufficient to make electric contact with the aforesaid metallic strips mounted
therein. This plug may be covered by a metallic cap.
The metallic strips at the fixed end of the inner stationary rod are connected
by suitable insulated wires to the electric leads, thus completing the electric
connection between the lamps and the leads in whatever position, between the
assigned limits, the sliding tube carrying the lamps may be fixed.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in Pillars and Electroliers or Pendants for Electric
Lamps.
We, RICHARD BROWN EVERED, of the firm of Evered & Co. Limited of
27 Drury Lane, in the County of Middlesex, Brassfounder, and THOMAS RUDLING,
of 47 Parina Crescent, Lavender Hill, in the County of Surrey, Electrician, 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 :-
Our invention relates to pillars or standards and pendants for electric lamps,
and is designed to provide, in a more simple and efficient manner than heretofore,
for permitting the raising and lowering of the lamp or lamps whilst maintaining the
electrical connections or contacts unbroken.
Our improved pillar or pendant comprises an outer tube and an inner tube, the
said inner tube being constructed to slide freely within the outer tube, but being
restrained from rotation therein, and a set-screw or equivalent device being pro-
vided for securing it in any desired position therein. We line the inner tube with
suitable insulating material and secure along the inner surface of the said insulating
material two strips of conducting material, which extend approximately from end
to end of the tube, or throughout a distance equal to that through which the inner
tube is intended to be capable of movement within the outer tube. We secure in
the outer tube, a rod of wood or other suitable insulating material, which is of
such diameter that the sliding inner tube can move freely thereon, and to which
are attached two contact pieces or springs adapted to bear against the contact
strips in the inner tube. The contact springs being connected to one pair of wires
or conductors and the contact strips to the other pair thereof, it is obvious that the
required electrical connection will be maintained in any position of the inner tube
relatively to the outer tube, and notwithstanding the sliding movement of the
former within the latter.
In the accompanying drawing we have shown a telescopic pillar or standard
having our present improvements applied thereto.
Figure 1 is a side elevation partly in vertical central section,
Figure 2 is a horizontal section on the line, a, Figure 1, and
Figure 3 is a side elevation of the inner rod having the stationary contacts
attached thereto.
A is the outer tube which is provided with supporting pieces or fect A. B is
the inner tube which is arranged to slide within the tube A and is provided with
collars B for guiding it therein. C is a ring or cap secured upon the upper end
of the tube A for the purpose of guiding the tube B and retaining it in the tube A.
The tube B is made with longitudinal ribs or feathers B which work in grooves or
notches in the ring or cap C, so that, the said tube,, while being free to move
endwise in the tube A, is restrained from rotation therein. D is a set-screw or
thumb-screw for securing the tube B in any desired position in the tube A.
a, a' are strips of insulating material which are secured in any convenient manner
within the tube B, and to which are attached respectively strips 6, of brass or
other suitable conducting material. These strips are to be electrically connected
to the leading-in wires of the lamp or lamps by means of conductors E, E.
c is a rod of wood or other suitable insulating material which is of such diameter
that it fits easily within the inner tube B, and which is firmly secured at its lower
end in the outer tube A. Two contact pieces or springs d, are secured to this
rode in such a manner that they bear against the contact strips b, b' respectively.
The said contact springs are fitted in vertical grooves in the said rod c and are to
be electrically connected with the generator or source of electricity by means of
the wires or conductors F, F'. The rod c extends beyond the upper end of the

page_text: outer tube A, and the contact strips b, 6' extend nearly from end to end of the
inner tube B. The contact springs d, d' will, therefore, continually press against
the said strips b, b' notwithstanding the up and down movement of the inner tube.
The lamp fixtures or brackets are to be attached to the projecting end of the
sliding tube in any convenient manner.
When our improvements are applied to a pendant or electrolier, the inner tube
is secured in any convenient manner to a ceiling-plate or other suitable support,
and the outer tube carries the lamps and is movable up and down relatively to the
inner tube; moreover, in place of the screw D, suitable chains and weights are
provided for counterbalancing the weight of the outer tube and the parts carried
thereby. Or the outer tube may be lined with insulating material and provided
with contact strips, which are to be attached at one end to the wire leading to
the lamp.
The inner tube is, in this case, attached at one end to a suitable ceiling rose or
plate; and at its other extremity is provided with two springs, which are insulated
from each other and are connected to the mains by insulated wires extending down
within the inner tube. These springs press upon the conducting strips in the outer
tube and thus make contact therewith in any position to which the outer tube may
be adjusted.
By the improvements above described, we provide a very efficient sliding con-
tact for electric lamp standards or pendants, and our apparatus is less liable to get
out of order than those heretofore used.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:-
First. In a standard, pillar or pendant for an electric lamp, the combination of
two tubes one of which is provided internally with longitudinal insulated con-
ducting strips and the other with contact springs adapted to press against the said
contact strips, and one of which is fitted to slide longitudinally in the other but is
restrained from rotation therein, for the purpose above specified.
Second. A. standard, pillar or pendant having our improvements applied thereto
substantially as described with reference to the accompanying drawing.
Dated this 9th day of July 1891.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicants.