Improvements in or relating to Electrical Terminals.
Year: 1891

page_text: .Date of Application, 28th Oct., 1891
Complete Specification Left, 27th July, 1892-Accepted, 3rd Sept., 1892
PROVISIONAL SPECIFICATION.
Improvements in or relating to Electrical Terminals.
- I, CHARLES JAMES HALL, of 117, Bishopsgate Street Within, in the City of
London, Electrician, do hereby declare the nature of this invention to be as
follows:-
My invention relates to the circuit terminals used for currents of electricity, the
object in view being to prevent accidental contacts with the same.
In carrying out my invention, I provide a washer shaped piece of porcelain or
other good non-conducting material, with a hole through it, and adapt it to receive
one end of a terminal, the other end extending some distance through the hole.
The end of the terminal just mentioned, is the one-for example-which is directly
connected to the main circuit conductors and the terminal end is therefore adapted
for this purpose and also provided with a head, or shoulder, or other equivalent
device, so that it can be held in its proper relative position to the washer, and
cannot be drawn through.
In addition to the plain washer just mentioned, I also provide a screwed washer
of porcelain, having a corresponding central hole, and each of them may be provided
with a shoulder, collar, or projection adapted to fit in or upon a board or base, upon
which the terminal is mounted. The screwed portion of the screwed washer is
placed outwardly from the terminal base, and upon it is screwed a porcelain cap so
formed and proportioned as to enclose the outer end of the terminal, and thus
prevent accidental contact with the same.
It will be understood that the invention may vary somewhat in form to suit the
shape of the terminal or kind of base on which it is mounted, and I may use wood,
or any other suitable non-conductor adapted for the purpose mentioned.
Dated this 27th day of October 1891.
FAIRFAX & WETTER,
433, Strand, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Electrical Terminals.
1, CHARLES JAMES HALL, formerly of 117 Bishopsgate Street Within in the
City of London, now of 207 Hyde Park Road, Headingley, Leeds, in the County
of York 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 :-
My invention relates to the circuit terminals used for currents of electricity, the
object in view being to prevent accidental contact with the same.
In carrying out my invention I provide a washer shaped piece of porcelain (or
other good non-conducting material) with a hole through it, adapted to receive one
end of a terminal, the other end extending some distance through the hole. This
last named terminal end is connected to the main circuit conductor, (for example),
and is therefore adapted for this purpose; but it is also provided with a head,
shoulder, or equivalent device whereby the terminal may be held in its relative
position to the aforesaid washer and cannot be drawn through.
In addition to the plain washer just mentioned, I also provide a screwed washer
of porcelain, having a corresponding central hole, and each washer may be provided
with a shoulder, collar, or projection adapted to fit in or upon a board or base upon
which the terminal is mounted. The screwed portion of the screwed washer is
placed outwardly from the terminal base, and upon it is screwed a porcelain cap so
Prid

page_text: formed and proportioned as to enclose the outer end of the terminal, and thus
prevent accidental contact with the same.
may use
It will be understood that variations in form may be made to suit the shape of
the terminal or kind of base on which it is mounted, or its position, and I
wood or any other suitable non-conductor adapted for the purpose mentioned instead
of the before mentioned porcelain.
In the further description of the invention, reference is made to the accompanying
drawings in which
Fig. 1 is a section through the aforesaid washers, and cap, with a terminal, all
mounted in their relative position on a suitable base.
Fig. 2 is a plan of the cap.
Fig. 3 is a longitudinal elevation of a terminal, and Fig. 4 an end view of the same.
Fig. 5 is a longitudinal elevation showing a safety fuse suspended between two
terminals, (one of them with protecting caps, washers, and base shown by a section).
Fig. 6 is an elevation and Fig. 7 a transverse section of the same. In Fig. 1 the
terminal is adapted for connection with a transformer (for example), while Fig. 5 is
modified to receive a safety fuse.
In the drawings a is the central part of a terminal, b, b, are end pieces for the
same, each formed and adapted to receive and connect with the circuit conductor;
c is a porcelain washer having a central hole through which the terminal a is
passed, d is a similarly formed porcelain washer but having a screwed portion and
seat adapted to receive a correspondingly shaped cap e, also of porcelain or other
suitable non-conducting material. The cap encloses the outer end of the
terminal a, which would otherwise be exposed, and thus prevents accidental contact
therewith. A central or other conveniently placed hole is made in the cap e through
which the circuit conductor may be passed to connect with a terminal end piece b,
and this allows a cap e to be unscrewed upon a cable conductor (for example) when
a connection is to be made. The whole is mounted on a convenient base f as
indicated by Fig. 1.
For some special purposes it is required to mount the terminals so that circuit con-
nections may be easily made or changed at both ends of the terminals. In Fig. 5 a
safety fuse 9 is so mounted between the inner ends of two terminals, while the outer
ends of the terminals can easily be got at to make any required circuit connections.
For this purpose it is more convenient to have two screwed porcelain washers and
two caps fitting thereon, thus dispensing with the plain washer shown in Fig. 1.
In order to remove or replace the fuse g easily and quickly the inner caps have
their central orifice extended to the side of the cap, (as is also shown in Figs. 5
and 7) to conform to the shape of the fuse g. These readily admit a new fuse and
make good contact therewith; and suitable shoulders are made on the end pieces b
to keep them in position and prevent them being drawn through the central hole in
the washers c or d.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is ;-
.
1. The combination of an electrical terminal a having end pieces 6 seated in and
upon a plain porcelain washer c and a screwed porcelain washer d with a porcelain
cap e enclosing one of the said end pieces b, substantially as and for the purpose
herein described and shown.
2. The combination of an electrical terminal a having end pieces 6 seated in and
upon two screwed porcelain washers d with two porcelain caps screwed upon said
washers d each cap enclosing an end piece 6-substantially as and for the purpose
herein described and shown.
Da 0-11
ST11000
FAIRFAX & WETTER,
433, Strand, London, Agents for the Applicant.