Improvements in and relating to Electrical Cut-outs and Fittings.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in and relating to Electrical Cut-outs and Fittings.
I, GEORGE MONTAGUE SELLICK, of 68, Glenparke Road, Forest Gate, in the
County of Essex, Manufacturer of Electrical Accessories, do hereby declare the
nature of this invention to be as follows:-
This invention relates to electrical cut-outs and fittings particularly such as
are used in electric light installations and so forth of the kind in which a fusible
wire is included in the line circuit, and has for its object to render such cut-outs
more efficient than those in use at present, and to obviate liability of leakage
or arcing between the line terminals of the fitting (when the wire is fused) through
the metal screw ordinarily used for retaining the cover in place.
Cut-outs of this kind are made in porcelain, ebonite or other insulating material,
and hitherto the cover, also of the same material has been attached by means of a
metal screw or bolt passing midway through the bridge or solid material separat-
ing the line terminals. According to my invention I use for securing the cover
to the base a screw or bolt made of porcelain or other insulating material and I
form a female threaded hole for same in the said solid bridge piece, by moulding
when the porcelain is in the plastic state or otherwise. Thus in my improved cut-
out there is no conducting material in the space separating the terminals and
liability to leakage or arcing between same and consequent disastrous results are
obviated.
The same method of fixing the cover may be applied to ceiling roses and other
fittings.
Improvements in and relating to Electrical Cut-outs and Fittings.
I, GEORGE MONTAGUE SELLICK, of 50, Park Lane, Tottenham, in the County of
Middlesex, and formerly of 68, Glenparke Road Forest Gate, in the County of
Essex, Manufacturer of Electrical Accessories, 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:-
-
This invention relates to electrical cut-outs and fittings, particularly such as are
used in electric light installations, and so forth, of the kind in which a fusible wire
is included in the line circuit, and has for its object to render such cut-outs more
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page_text: efficient than those in use at present; and to obviate liability of leakage or
arcing between the line terminals of the fitting (when the wire is fused) through
the metal screw ordinarily used for retaining the cover in place.
Cut-outs of this kind are made in porcelain, ebonite or other insulating material,
and hitherto the cover, also of the same material, has been attached by means of
a metal screw or bolt passing midway through the bridge or solid material
separating the line terminals.
I will describe my invention by referring to the accompanying drawings, in
which by way of example a double cut-out is shown having my improvements
applied thereto. In the drawing
Fig. 1 is a plan partly in section,
Fig. 2 is a sectional elevation, and
Fig. 3 is a detail hereinafter referred to.
A is the body of the cut-out to which the line conductors BB lead, the latter
being secured in position by binding screws CC in the usual manner. DD are
the fusible wires intercepted between the ends of the line conductors. The fore-
going parts are all of ordinary construction and therefore form no part of my
invention. In order to prevent leakage or arcing between the terminals after the
destruction or fusion of the wire, or wires, D, I omit the metal bolt, pin, or
screw, hitherto used for securing the cover in cut-outs of ordinary construction,
and in lieu thereof I employ a loose screw E of porcelain or other suitable insulat-
ing material and I insert the same in a hole F¹ provided in the cover F. The
screw E is formed with a head E¹ and is adapted to be screwed into a female
threaded hole G provided for its reception in the middle or solid portion of the
bridge H, as shown. The screw threads in the hole G are advantageously formed
by moulding when the porcelain is in the plastic state and the screw E may by
preference be provided with washers I and J of insulating and yielding material,
the washer I being applied to the head of the screw to prevent overstraining of
the screw, and the washer J to the portion of the screw in the interior of the
cover F for preventing its being lost when removing the cover.
The same method of securing the cover may be applied to ceiling roses and to
other fittings of a similar kind.
Obviously by the use of a screw of non-conducting material, say, porcelain, in
lieu of a metal bolt or screw for securing the covers to the cut-outs, and whereby
the presence of any conducting material is removed from the space separating the
terminals, liability to leakage or arcing and consequent disasters are effectually
overcome.
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 improvements in electric cut-outs or other like fittings, substantially as
herein before described, and whereby the conducting material is removed from the
space separating the terminals for the purpose of preventing liability to leakage
or arcing after the destruction of the fusible wire.
Dated this Twenty-second day of August 1898.