Improvements in Electric Light Fittings.
Year: 1891

page_text: Date of Application, 19th Oct., 1891
Complete Specification Left. 6th Apr., 1892-Accepted, 7th May, 1892
PROVISIONAL SPECIFICATION.
Improvements in Electric Light Fittings.
We, JAMES ARAM LEA, JAMES FRANCIS LEA, and ARTHUR HENRY LEA,
all of Pengwerne Works, Shrewsbury in the County of Salop, Electrical Engineers,
trading as Lea, Sons and Company, do hereby declare the nature of this invention
to be as follows:-
This invention has reference to electric light fittings and consists in providing an
universal joint constructed with hollow balls and central pins, of any suitable
material, which give perfect freedom of action or movements, combined with
firmness in construction and secures absolute safety. against abrasion or cutting of
the wire or wires or cords which are passed through for conducting the current for
the electric light.
Dated this 17th day of October 1901
JAMES ARAM LEA.
JAMES FRANCIS LEA.
ARTHUR HENRY LEA.
COMPLETE SPECIFICATION.
Improvements in Electric Light Fittings.
"We, JAMES ARAM LEA, JAMES FRANCIS LEA, and ARTHUR HENRY LEA,
all of Pengwerne Works, Shrewsbury, in the County of Salop, Electrical Engineers,
trading as Lea, Sons & Company, 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 relates to electric light fittings, and has for its object to provide a
fitting having perfect freedom of action and at the same time to secure absolute
safety against the abrasion or cutting of the wires or conductors which are passed
through the fitting for conveying the electric current to the lamp.
According to our invention we provide the fitting with a universal joint or joints
constructed with hollow balls and central pins.
To enable our invention to be fully understood we will describe the same by
reference to the accompanying drawings, in which :-
Figure 1 is a plan view of a two joint fitting provided with our improvements;
and,
Figure 2 is a side elevation of the same:
Figure 3 is a section on the line xx, Figure 2:
Figure 4 is a section on the line y y, Figure 3; and,
Figure 5 is a section on the line 2 2, Figure 2.
a, a indicate the joints with which the fitting shewn in the drawings is provided
but as both of these joints are of similar construction we will only describe one of
the same.
с
Each joint comprises three hollow balls b, c, d, the first mentioned of which is
fixed whilst the ball c turns upon a seat upon the ball and the ball d upon a seat
upon the ball c.
The said seats are placed at right angles to each other so as to
allow of the movement of the bracket in two different planes at right angles to each
other in a manner well known in connection with the joints of gas-brackets. e, fare
the central pins by means of which the hollow balls are retained in their proper
relative positions, the pin e being passed through the balls b, c and having at its
ends nuts g, h by means of which the pressure upon the seat between the two balls b

page_text: and c can be retained, and the pin f serving to connect the balls c and d and passing
through an aperture i in the pin e. The pin is provided with a thumb-nut j by
means of which the pressure between the said balls c and d can be adjusted. The
conductor is passed around the pins in order to retain the same in its proper
position and to prevent it from being damaged by coming into contact with the
movable parts of the joints. As shewn in Figure 3 the conductor, entering the
ball through the tube connected therewith, is passed around the pin e thence into
the ball c and thence around the pin finto the ball d.
с
In order to prevent the wire from being broken by twisting the bracket too much
we preferably provide in connection with each ball a stop. As shewn in Figure 3,
the ball is provided near its seat with a lug k and the ball d is provided with a
lug designed to impinge against the lug and to prevent the said ball d from
being moved more than one revolution relatively to the ball c.
Similar stops may
be provided for preventing the ball c being moved more than one revolution
relatively to the ball b.
m indicates the socket for carrying an incandescent lamp, the said socket being
adapted to turn upon a seat n secured to the arm of the bracket and provided
with a handle o by means of which the angle of the socket m may be adjusted as
required.
Having now particularly described and. ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what we
claim is :-
1. In an electric light fitting, a joint consisting of three hollow balls adapted to
rotate in planes at right angles to each other and connected together by central
pins, substantially in the manner described.
2. The improvements in electric light fittings substantially as herein before
described and illustrated in the accompanying drawings.
Dated the 6th day of Anril 1809
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.