ELECTRIC SAFETY FUSE to be as follows:-.
Year: 1884

page_text: I, ROBERT EDWARD DUNSTON, of Malden Factories, Kentish Town, in the county
of Middlesex, Civil Engineer, do hereby declare the nature of my invention for
"ELECTRIC SAFETY FUSE to be as follows:-
.
"
My invention relates to a construction of electric safety fuse, that is to say, a
portion of a conductor which will give way when excess of current passes through
it, and thus save the rest of the conductor and other parts of the circuit from
injury. The chief objects which I have in view are simplicity of construction of
the safety fuse, and facility of connecting into circuit a fresh safety fuse, as I will
describe referring to the accompanying drawings.
Fig. 1 is a longitudinal section and fig. 2 a plan of electric safety fuse according
to my invention. Two side pieces of wood a a are fitted tightly against shoulders
of two round metal pins b b, through holes in which is passed a lead wire c. These
parts form together a small removeable frame, of which a number may be kept
ready for successive use with the rest of the apparatus which consists of a base d
of wood or other imperfectly conducting material having fixed on it two pieces of
metal e c¹, each made with a hole and pinching screw to hold the ends of the circuit
wires. The picce e is hollowed in front to receive one of the pins b, and the other
piece e¹ has attached to it a bent metal spring f which is hollowed to receive the
other pin b. The removeable frame carrying the lead wire c can, in a moment, be
sprung into its place, making good contact with e and f, and should the wire c be
fused by an excess of current, the spring f can be pulled back by the finger
sufficiently to permit of the frame being removed, whereupon a frame containing a
fresh wire c can at once be sprung into its place.
Fig. 3 is a longitudinal section and fig. 4 a plan of a safety fuse having a long
wire c, and instead of the spring f shewn in figs 1 and 2, the whole end piece g can
slide back, the screws that hold it down passing through slotted holes and helical
springs h h pressing it forwards.
Fig. 5 is a longitudinal section a fig. 6 a plan of a safety fuse having a number
of wires c for the passage of a considerable electrical current.
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.

page_text: I, ROBERT EDWARD DUNSTON of Malden Factories, Kentish Town, in the county
of Middlesex, Civil Engineer do hereby declare the nature of my said invention
for "ELECTRIC SAFETY FUSE" 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 a construction of electric safety fuse, that is to say, a
portion of a conductor which will give way when excess of current passes through
it and thus save the rest of the conductor and other parts of the circuit from
injury. The chief objects which I have in view are simplicity of construction of
the safety fuse as I will describe referring to the drawings filed with my Provisional
Specification on the 16th July 1884. Fig. 1 is a longitudinal section and fig. 2 a
plan of electric safety fuse according to my invention. Two side pieces of wood a a
are fitted tightly against shoulders of two round metal pins bb through holes in
which is passed a lead wire c. These parts form together a small removeable
frame, of which a number may be kept ready for successive use with the rest of
the apparatus, which consists of a base d of wood or other imperfectly conducting
material having fixed on it two pieces of metal e e¹ each made with a hole and
pinching screw to hold the ends of the circuit wires.. The piece e is hollowed in
front to receive one of the pins b, and the other piece e¹ has attached to it a bent
metal spring f, which is hollowed to receive the other pin b. The removeable
frame carrying the lead wire c can in a moment be sprung into its place making
good contact with e and f, and, should the wire c be fused by the excess of current,
the spring f can be pulled back by the finger sufficiently to permit of the frame
being removed, whereupon a frame containing a fresh wire c can at once be sprung
into its place.
Fig. 3 is a longitudinal section and fig 4 a plan of a safety fuse having a long
wire c and instead of the spring f shewn in figs. 1 and 2 the whole end piece
can slide back, the screws that hold it down passing through slotted holes and
helical springs, h h pressing it forwards.
Fig 5 is a longitudinal section and fig. 6 a plan of a safety fuse having a number
of wires c for the passage of a considerable electrical current.
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
The construction of electric safety fuse, wherein a lead wire is passed through
holes in two metal bars kept apart by non-conducting stretchers, the whole
constituting a frame that can be readily placed between or removed from between
a pair of conducting pieces substantially as herein described.
Dated this on day of April 1000.
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.