Improvements in Electric Fuse Holders.
Year: 1898

page_text: Date of Application, 31st Dec., 1898-Accepted, 18th Feb., 1899
COMPLETE SPECIFICATION.
Improvements in Electric Fuse Holders.
I, CHARLES HOWARD, at present residing at 345, Fulham Road, London, in
the County of Middlesex, 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 following statement
My invention relates to improvements in electric fuse holders by means of
which certain advantages are obtained
My invention consists essentially of three integers which for the purposes of
this specification I shall term the cup, the cover, and the ports. To these may
be added other integers, namely the filling, the attaching device, the base piece
and the terminals.
The cup consists of a dished disc or cup or other hollow device designed to
hold or contain the fuse proper. It may be composed of porcelain or other suit-
able material
The cover consists of a plate, sheet or lens of glass, mica, talc or other trans-
parent material It is designed to cover the mouth of the cup and enable the
state of the fuse within the said cup to be readily scen
The ports consist of orifices, openings or passage ways cut or formed in the
wall of the cup or of the cover or between the two. The said ports are designed
for the passage of the fuse or of the connecting wires leading thereto
It
The filling consists of plaster of Paris, cement or other suitable material
is poured into the cup and may serve partly to fix the fuse proper in position
and partly to fill up such part of the cup as may not be occupied by the fuse
or such part as it may be desued should be filled up
The attaching device may consist of a luting of plaster of Paris, cement or
other material suitable for affixing the cover to the cup, or it may consist of a
binder such for example as a screw and nut, a bridging piece or sliding staple
01 the like
The base piece consists of a separate 1ose or plate upon which the cup may be
detachably mounted
The terminals consist of plates or blocks of conducting material of any of the
usual well known forms.
My invention presents a sightly appearance and enables the state of the fuse
to be ascertained by a glance
Having now described my invention in general terms and so as to indicate its
scope I shall proceed to describe in detail how it is to be or may be carried
into effect and for that purpose I shall refer to the accompanying drawings which
llustrate three forms of my invention which give good results in practice
In these drawings,
Figure I is a section of the cup and the base piece through the centre.
Figue II is a plan of the base piece
Figure III is a plan of the cup and attaching device
TIV

page_text: Figure Vis a section through the centie showing the same two alternative
attaching devices
Referring now to Figures I, II and III, 1 is the cup, shown in section in
Figure I and in plan in Figure III 2 is the cover shown in section in Figure I
and in plan in Figure III. The ports are shown at 3, 3, and consist of openings
cut in the cup, through which pass the ends of the fuse wire 4 The space inside
the cup not occupied by the fuse wire is shown filled in with plaster 14 which
constitutes the filling The attaching device consists in this case of a luting of
plaster 5 which secures the cover to the cup.
It will thus be seen that the fuse wire is visible and that it is easy to ascertain
its condition at a glance In the event of a fuse having blown the nut 7 18
unscrewed, the cup taken off and replaced by another.
Figures IV and V show two alternative arrangements for securing the cover
to the cup
In one form the luting 5 19 replaced by a spring clamp 6 which
pressed down by a nut 7 The other arrangement shown is that of two spring
staples 8 which are bent over and grip the cover in position In Figure V one
side of the section shows the spring clamp aud the other side the spring staple
The base piece 9 consists of a separate rose plate upon which the cup rests,
and it carries the terminals 10, 10
The ends of the fuse wire, after passing through the ports, are bent over
so as to bear upon the terminal plates 13 when the cup is pressed down onto the
base piece
The binder which secures the cover to the cup may in some cases be utilized
to hold the cup to the base piece as shown in Figure V, where the nut 7 works
on a screw 11 fixed in the base piece
In Figure I where the attaching device consists of a plaster luting, the cup
19 shown held to the base piece by a nut 7 and 8pung washer 12 resting duectly
on the cover.
The clamp 6 shown in Figure V and the washer 12 shown in Figure I may
be dispensed with and the nut 7 relied upon to hold the cover in position.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1 In an electric fuse holder the combination of a cup, a cover and ports
substantially as set forth
2 In an electric fuse holder the combination of a cup, a cover, ports and filling,
substantially as set forth
3 In an electric fuse holder the combination of a cup, a cover, ports and
attaching device for attaching the cover to the cup substantially as set forth
4 In an electric fuse holder the combination of a cup, a cover, ports, attaching
device for attaching the cover to the cup, and a base piece substantially as set
forth
5 In an electric fuse holder the combination of a cup, a cover, ports, attaching
device for attaching the cover to the cup, base piece, and terminals fastened to
the base piece substantially as set forth.
001
1000
Dated the 80th December 1808
For the Applicant,
JG LORRAIN, MIEE,
Norfolk House, Norfolk Street, London, WC,
Chartered Patent Agent