Improved Fusible Cut-out for Electric Lighting and the like.
Year: 1897

page_text: Date of Application, 7th Oct., 1897
Complete Specification Left, 18th Mar., 1898-Accepted, 1st Oct., 1898
PHOTOIONAL ITCIFICATION.
Improved Fusible Cut-out for Electric Lighting and the like.
I, JULIUS PESCHEк, of 42, Wellington Road, Charlton, London, S.E., in the
County of London, Electrical Engineer, do hereby declare the nature of this inven-
tion to be as follows; :-
In constructing my fusible cutout I take a strip of asbestos millboard, mica, or
other suitable incombustible material, and lay upon it a strip, foil, or wire of tin,
lead or other suitable metal or alloy. At the ends of the strip I fold a piece of thin
brass, or other suitable metal round the ends of the strip, in intimate contact with
the fusible strip. This strip or shield is drilled or slotted as well as the incombus-
tible support to admit of the fuse being suitably clamped or screwed to the metal ter-
minals in a porcelain fuse box of the ordinary form, or I may use a specially con-
structed case or box of suitable incombustible material.
For the purpose of preventing damage to the screws and plates of the afore-
mentioned metal terminals, by the "arcing" which occurs when the fuse is melted
by excess current passing through it, I form the motal shields folded round the
ends of the fuse, so that they project from the terminal blocks, thus taking the
are, and saving the screws or clamps from damage. These plates are part and
parcel of the fuse, and replaced with it, and also serve to protect the metal of
which the fusible strip is composed from damage when screwing in position.
Dated this 7th day of October 1897.
JOHN HEWETT, A.M.Inst.E.E.,
8, Great Portland Street, London, W., Agent for the Applicant.
Improved Fusible Cut-out for Electric Lighting and the like.
I, JULIUS PESCHEK, of 42, Wellington Road, Charlton, London, S.E., in the
County of London, Electrical Engineer, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:--
In carrying out my invention, I take a strip of mica, asbestos, millboard, or.
other suitable incombustible material, K and lay upon it a strip, foil, or wire, of
tin, lead, or other suitable metal or alloy. In the case of very thin fuses, re-
quired to melt with very small currents I may place a second strip of incombus-
tible material above the first so as to enclose and mechanically protect the thin
wire, and fold a piece of thin brass, copper, or other suitable mate-
017

page_text: rial or metal round the ends of the strip, in intimate contact with the
fusible strip, or I may pass the fusible foil or wire along the face of the incom-
bustible strip K previously prepared with metal ends as beforementioned, and pass
it through holes in, or solder to, the metal ends.
In the drawing Figure 1 shows part of a 10 way fuse box with the case or
cover taken away, to illustrate the manner of employing the cut-out, and Figure 2
the cut-out alone.
رو
The cut-outs are clamped in position by the screws or nuts A B, making contact
with the metal "bus bar or common return C, and the brass block D, which is
connected to the lead by clamping under the screw E. When a current exceeding
by a known percentage, the carrying capacity of the cut-out passes through it, it
melts the fusible strip or wire G and may cause "arcing" between the screws AB,
or screw A and block D, or any portions of each of them. For the purpose of
preventing damage to these screws and blocks, should this "arcing" occur, I
form the metal shields H, preferably by suitably shaping and bending the pieces
of sheet used to form the metal ends of the cut-out F, so that the are being
started runs to these shields H, and partially consuming them, goes out without
damaging the metal parts before described..
I may form these shields H of a special metal or alloy, which by its nature is
incapable of maintaining an arc.
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. The construction of a fusible cut-out, as described and illustrated in the
drawings.
2. The use of the shields H, either alone or in combination with the 'metal
ends clamping the fusible strip G to the incombustible strip K, as described and
illustrated in the drawings.
3. The combination of the fusible strip G with the infusible strip K with the
metal ends F and the shields H, the whole forming a fusible cut-out, as described
and illustrated in the drawings.
4. The use of the metal ends F in combination with the infusible strip K and
the fusible strip G, forming a fusible cut-out, as described and illustrated in the
drawings.
Dated this 18th day of March 1898.