A New or Improved Distribution Board and Fuse Bridge.
Year: 1899

page_text: Date of Application, 29th June, 1899
1000
PROVISIONAL SPECIFICATION.
A New or Improved Distribution Board and Fuse Bridge.
We, EDWARD HENRY JOHNSON, Electrical Engineer, 66, Wallgate, Wigan,
FRED JOHN BORLAND, A.M.I.E.E., Electrical Engineer, Sheepscar Grove Works,
Benson Street, Leeds, do hereby declare the nature of this invention to be as
follows:-
Our invention relates to electric fuse or distribution boards, and fuse bridges
or carriers and has for its object the reduction of space, increased insulation and
the rendering of short circuits impossible.
According to our invention we make use of block or blocks of suitable insulat-
ing material which we place side by side. The bus bar (or bars) we place inside
the blocks, and suitable contacts are made, with these bars through special holes
in the blocks. The through terminals are entirely enclosed or embedded. All
bus bars are likewise entirely enclosed. All metalic connections are enclosed or
embedded. The fuse bridges or carriers are constructed of suitable insulating
material provided with contacts to pass thro' holes or openings in foundation
blocks, into the bus bars & terminals. The through terminals are all covered or
embedded and contact is made through holes or openings in the foundation blocks.
Fuse wire and contacts are protected by deep slot in fuse bridge, or carrier,
which is shaped in such a manner, as to give the required break.
Main connections may be made at end of bus bars, or through suitable openings
at the hack of foundation blocks forming the board.
1000
COMPLETE SPECIFICATION.
A New or Improved Distribution Board and Fuse Bridge.
We, Edward HENRY JOHNSON, Electrical Engineer, of 66, Wallgate, Wigan, in
the County of Lancashire, and FRED JOHN BORLAND, Electrical Engineer, of Sheep-
scar Grove Works, Benson Street, Leeds, in the County of York, 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 consists of an improved form of distribution or fuse board and
fuse bridge principally designed to get better insulation, to reduce the space
required and to render arcing or short-circuiting impossible.
Fig. 1 shows the front elevation of 3 cut-outs mounted.
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page_text: Fig. 3 shows the plan of Fig. 1.
Fig. 4 shows the front elevation of one section of Fig. 1.
Fig. 5 shows the back view of Fig. 4.
Fig. 6 shows the section through Fig. 4.
Fig. 7 shows the side view of fuse bridge.
The principal part of our invention consists in the enclosing of bus-bar
(a Fig. 1) and distributing terminal (6 Fig. 1) by doing which no live parts are
exposed.
The cut out proper is composed of an insulating and non-inflamable block (A
Fig. 2) preferably of porcelain having a conduit (e Fig. 6) to receive the bus-
bar (a Fig. 1) which carries the current to the various fuse blocks (A). There
is also a longitudinal cavity (d Fig. 6) which receives the distributing terminal
( Fig. 1) on the top plane of each block are two holes (e, f, Fig. 4) which
permit the contact pins of fuse bridge (i, j. Fig. 7) to enter the corresponding
holes in in the bus-bar and distributing terminals, thereby completing circuit
through fuse when the fuse bridge is in position as shown in Fig. 2.
Blocks to any number may be threaded on the bus-bar and are held in posi-
tion by screw (k) which enters a wooden batten upon which the blocks are mounted
The contact holes in bus bar, are held in register by means of screw (1, Fig. 5).
The contact holes in distributing terminals (6) are kept in position by screw (n.
Fig. 5) passing thro the hole (m, Fig. 6) in block, this screw also serves to bind
the circuit wire.
The fuse bridge is composed of insulating non-inflamable material, prefer-
ably porcelain which contains a channel (o, Fig. 3) to receive the fuse wire. At
either end of bridge is provided a split contact pin (i, j, Fig. 7) to the upper
extremity of which is attached the fuse, by means of screw (p, q, Fig. 7). The
lower extremities pass through the holes (e, f) in block (A) and thus complete the
circuit from bus-bar, through fuse to the distribution terminal. The fuse bridge
is made shape (Fig. 7) so that the fuse wire passing down the channel is
extended to the required length for use on high voltage.
These fuse blocks can be used on single or double pole distributing fuse boards.
The current is brought by means of the main cable to the bus-bar to which
it is connected by the terminal screw (s Figs. 1, 3) passing up the split contact
pin (7) through the fuse wire over the fuse bridge, through the slit contact
pin () to the distributing terminal (b) from which it is distributed the circuit
through the circuit wire which is connected to the distributing terminal (b) by
means of screw (n). Insulating rings (t, Figs. 1, 3) may be used to separate
the blocks (A) and to insulate the bus-bar.
Having now described and ascertained the nature of our invention and in what
manner the same is to be performed, we declare that what we claim is:-
First. A distributing fuse board in which the bus-bar and distributing ter-
minals are enclosed in insulating material.
Second. A distributing fuse board in which the terminals are brought close
together without diminishing the length of break required for high voltage.
Dated this 28th day of March 1900.
E. H. JOHNSON.
F. J. BORLAND.