Improvements in Electrical Distribution Switch and Fuse Boards.
Year: 1899

page_text: Date of Application, 12th Oct., 1899-Accepted, 18th Nov., 1899
COMPLETE SPECIFICATION.
Improvements in Electrical Distribution Switch and Fuse Boards.
I, ALFRED JARAY, of 66, Berners Street, Oxford Street, in the County of
London, Electrical Engineer, 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:-
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This invention relates to a simple and safe construction of electrical distribution
switch and fuse boards as will be described with reference to the accompanying
drawings.
Fig. 1 is a part plan of a pair of distribution boards according to this invention,
Fig. 2 is a transverse section with side views of the simple and switch bridges
shewn separate, Fig. 3 is a part longitudinal section with end views of the simple
and switch bridges.
Fig. 4 is a longitudinal section and Fig. 5 is a plan of the simple bridge,
Figs. 6 and being transverse sections on the lines C-6 and 7-7 of Fig. 4
respectively. Fig. 8 is a plan and Fig. 9 a plan with cover removed of the switch
bridge, of which Fig. 10 is a transverse and Fig. 11 a longitudinal section.
Each switch board a, which is made of insulating material, has on one side a
row of holes and on the other side a corresponding row of holes c which are all
bushed with brass or other conducting metal, the heads of the bushes being sunk
below, the surface of the board so that when the hand is passed over the board
it does not come in contact with any metal. The bushes of the holes b are all
screwed into a bar which is common to all the holes and has connected to it
a main lead e.
The bush of each of the c holes is secured in place by a nut f screwed on it,
and has on it a second nut g for securing a wire between it and f. The simple
bridge made of insulating material has two spring plugs i and which when
the bridge his of material such as vulcanite or porcelain can be screwed in
as shewn at i or when it is of glass, can be screwed into a nut & let into a slot.
The under side of this bridge h is made with a deep groove in which is laid the
fuse wire having each of its ends secured between two nuts on the plugs i and j.
When the bridge h has its plugs inserted in the holes b and c the current passes
from the one bush and plug along the fuse wire to the other plug and bush.
The switch bridge m has also two spring plugs and has its body made as a
switch of well known kind. One end of the fuse wire is fixed to the plug i but
the other end is fixed to one of the contact plates n of the switch, the plug j
being screwed into the other contact plate. When the plugs are inserted into
the holes b and c and the switch lever is pulled over so as to force its metal part p
in between the plates n. then current passes from the one bush through plug i
fuse wire switch contacts n and p to plug j and the other bush.
The switch bridge instead of being made with plugs. to enter holes in a board
might obviously be made with contact pieces of other known forms to suit appro-
priate contacts other than holes on the board.

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
1. An electric distribution board made with holes lined with metallic bushes
having their heads sunk below the surface of the board and bridges for the same
each made of insulating material and provided with a pair of spring plugs con-
nected by a fuse wire passing along a groove on the underside of the bridge,
substantially as described.
2. A switch bridge made of insulating material with a pair of spring plugs
or their equivalents and a fuse wire connecting one of the plugs to one of the
switch contact plates, the other contact plate being connected to the other plug,
substantially as described.
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1
OD
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300