Improvements in Electric Switches and Fuses.
Year: 1898

page_text: Date of Application, 12th Apr., 1898 ..
MOTIIVAAL SPECIFICATION.
Improvements in Electric Switches and Fuses.
We, JAMES MCFARLANE, Works Manager, and HOLLAND HOUSE ELECTRICAL
MANUFACTURING COMPANY, LTD., Manufacturers, both of 9, Holland Place, in
the County of the City of Glasgow, North Britain, do hereby declare the nature
of this invention to be as follows:-
This invention relates to improvements in electric switches and fuses and has
for its object to prevent or lessen the forming of an are between the two ends of
the conductors when the circuit is broken; in the fuse, when the fuseable sub-
stance is fused or burned out; in the switch, when the movable part or parts
leave the fixed part or parts, or when the two or more moveable parts leave each
other.
In carrying out our invention we propose to arrange an insulating or dividing
piece of insulating material, preferably non-combustible, as for instance slate,
porcelain, mica, and such like, in such a way that either by gravity or by the
aid of a spring this insulating or dividing piece will move in between the arcing
points of the switch or fuse when the circuit is broken, and in this way prevent,
or destroy any tendency for an arc to form.
66
On position "
The act of replacing the fuse or of putting the switch into the
will be utilized for the removing of the insulating or dividing piece and the
placing of it in a position ready for further action.
Dated this 7th day of
لسما
1000
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicants' Patent Agents.
Improvements in Electric Switches and Fuses.
We, JAMES MCFARLANE, Works Manager, and HOLLAND HOUSE ELECTRICAL
MANUFACTURING COMPANY, LTD., Manufacturers, both of 9, Holland Place, in
the County of the City of Glasgow, North Britain, do hereby declare the nature
of this invention and in what manner the same is to be performed to be particu-
larly described and ascertained in and by the following statement:
.
Our invention relates to improvements in electric switches and fuses and has
for its object to prevent or lessen the forming of an are between the two ends of
the conductors when the circuit is broken; in the fuse, when the fusable sub-
stance is fused or burned out; in the switch, when the movable part or parts
Price 8d1

page_text: leave the fixed part or parts, or when the two or more movable parts leave each
other.
In order that our invention may be properly understood and readily carried
into effect, we have hereunto appended one sheet of drawings, of which
Figure 1 is a plan of a switch to which our improvements are applied, but
which forming no part of our invention need not be fully described.
Figure 2 is a front elevation of switch.
Figure 3 is detached view of part of Figure 2.
Figure 4 another detached view and elevation of part of Figure 2.
Figure is front elevation of fuse.
Figure 6 is detached view shewing construction of contact piece.
In carrying out our invention we have an insulating or dividing piece A of
insulating material, preferably non-combustible, as for instance slate, porcelain,
mica, and such like, in such a way that either by gravity, as shewn in Figure 5,
or by the aid of a spring B, as shewn in Figure 1, this insulating or dividing
piece A will move in between the arcing points of the switch C, D, as shewn in
Figure 4, or fuse E, F, Figure 5, when the circuit is broken, and in this way
prevent or destroy any tendency for an arc to form.
In the case of the fuse, the dividing or insulating shutter A is used as an
indicator G, as shewn in Figure 5 to shew when fuse has been burned out. On
replacing the fuse the indicator G is replaced at same time.
"
The act of replacing the fuse or of putting the switch into the on position
will be utilised for the removing of the insulating or dividing piece and the
placing of it in a position ready for further action.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is ;-
1. In electric switches and fuses, the use of an insulating or dividing piece
for the purpose of preventing arcing between the conductors, substantially as
described and illustrated on the accompanying drawings.
2. In fuses, the use of this dividing piece as an indicator to show when this
piece has been fused or burned out, substantially as described and illustrated
on the accompanying sheet of drawings.
T
111 T
1000
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicants' Patent Agents.