Improvements in Jointing Boxes for Conduits Carrying Electrical Conductors.
Year: 1896

page_text: Date of Application, 5th Mar.. 1896
Complete Specification Left, 5th Dec., 1896-Accepted, 6th Feb., 1897
Improvements in Jointing Boxes for Conduits Carrying Electrical
Conductors.
I FREDERICK BATHURST of 14 Green Croft Gardens, Hampstead in the County of
Middlesex Electrical Engineer, do hereby declare the nature of this invention to be
as follows:-
My invention relates to certain improvements in jointing boxes for conduits
carrying electrical conductors, and has for its object the perfect insulation of the
joints, the ready accessibility to them for repairs, extension, or testing, and further,
the absolute hermeticity of the whole when closed, against atmospheric humidity and
any external influence tending to deteriorate the joints between the branches of the
conduits. This invention is especially applicable to that class of conduits in which
an insulating tube is surrounded by a metallic tube.
In carrying my invention into effect I employ a box, preferably circular, made of
iron, or any other suitable metal, and fitted with lugs for attachment to any surface.
Branch nozzles may be attached to, formed upon, or fitted to said box so as to
enable a conduit system to be connected as aforesaid. The nozzles may be replaced
by nipples, with interior screwed or coned sockets, or other suitable method for
connecting tubes, and said nozzles projecting radially from the preferably circular
box may be of the same or different dimensions to suit the varying sectional areas of the
various branch leads of the installation. The construction of said box may be such that
a sheath of any insulating material which possesses rigidity at the normal temperature
of the atmosphere may fit therein comparatively luosely, and two lugs formed upon
the outer edge of the metallic case, projecting interiorly and being curved to present
a slight helical surface, enables the cover to be pressed tightly when closed so as to
secure hermeticity. Said cover is furnished with a fillet or a groove upon its inner
face, upon or into which is fixed a resilient ring or washer. A spring bar crossing
the centre transversely is arranged to engage with the helical lugs aforesaid, and by a
semi-rotary movement closes said cover and secures hermeticity by the compression
of the resilient washer or ring aforesaid.
As an alternative I may coat interiorly a metal case with an insulating material or
compound so that it may fit therein and become as it were an integral part thereof.
Nipples of insulating material similar to that comprising the interior conduit are
arranged to project into and meet the interior insulation of the inner tube, and to
preserve the perfect insulating system I wish to maintain.
تيمم
FREDK. WALKER,
Fellow of the Society of Patent Agents,
73 St. Stephen's Road, Upton Park, London, E.
Agent for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Jointing Boxes for Conduits Carrying Electrical.
.. Conductors.
I, FREDERICK BATHURST, of No. 14, Green Croft Gardens, Hampstead, 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 the following statement :-
My invention relates to certain improvements in jointing boxes for conduits
carrying electrical conductors, and has, for its object the perfect insulation of
the joints; the ready accessibility to them for repairs, extension or testing; and
further, the absolute hermeticity of the whole when closed, against atmospheric
humidity, and any external influence tending to deteriorate the joints between the
branches of the conduits. This invention is especially applicable to that class of
conduits in which an insulating tube is surrounded by a metallic tube.
In order that my invention may be the better understood, I have appended the
accompanying sheet of drawings in which Figure 1 is a plan view of a circular box
with two outlets, the cover being removed, and Figure 2 is a part sectional elevation
thereof showing means for fixing or attaching electrical fittings. Figure 3 is an
end elevation of the same, and Figures 4 and 5 are modifications of covers, shown
in section.
In carrying my invention into effect, I employ a box A, preferably of circular cross
section, made of iron or other suitable metal, and fitted with two or more lugs m for
attachment to any surface, such as a switch-board, wall ceiling or the like. Branch
nozzles CC may be formed upon or attached to said box A by screwing or other
means. Said nozzles may be replaced by nipples with interior screwed or coned.
sockets or other suitable method or means for connecting conduit tubes thereto,
and said nozzles CC projecting radially from the preferably circular box A may be
of any number, and of the same or different dimensions to suit the varying sectional
areas of the various branch leads of the circuit or installation. Within the box A is
a sheath or lining of any suitable insulating material or compound B, which is of
such constituence as to retain rigidity at the normal temperature of the atmosphere.
Said lining B need not fit the interior of the box A absolutely closely, but may be
free, or loosely fitted therein. The nozzles or nipples CC, are also provided with
an interior lining of insulating material D corresponding to the interior lining or
insulating covering of the conduits connected thereto. Within said box A, with
its insulating covering, or coating B, any electrical fitting such as a multiple jointing
or connection for one or more branches, an outlet, as shown by F, Figures 2, 3 and 4,
a wall plug, ceiling rose, bracket fitting, switch, safety fuse or cut out, or any
ordinary joint, branch or the like; may be adapted and fitted without impairing the
hermeticity or damp proof qualities of the boxes. The aforesaid fittings may be of
any type, preferably fixed upon a porcelain or other insulating base P, Figure 2,
which is screwed upon a studs, fixed to the bottom of the box A, in such a manner
that there is no perforation to cause leakage. It is evident that any fitting may be
adapted to the box A in this manner, if the insulated base thereof be screwed to
receive the end of the stud s. A cover E is fitted upon the box A, the latter being
provided with two or more lugs projecting inwardly from the upper edge, and
preferably being curved to present a slightly inclined or helical surface, so that
similar lugs upon the cover E may engage therewith, and by a slight twist in adjust-
ment compress a resilient ring or washer o fitted within a groove in the face thereof.
Or the hermeticity may be secured by causing said cover to impinge upon the
projecting edge of the insulating sheath or coating B, or this may be dispensed
with, and an ordinary metallic face contact be substituted.

page_text: Instead of said lugs upon the cover E, 1 may, attach thereto a spring clip S,
Figures 4 and 5, which may be attached by a single pin, rivet, or equivalent tas in
Figure 4, or two pins, rivets, or the like as in Figure 5, thus forming a spring bar,
which, engaging with the helical lugs upon A, by a semi-rotary movement closes
the cover E and secures hermeticity by compression and contact as hereinbefore
described.
As an alternative device I may actually coat the box A interiorly by causing
the insulating material or compound B to so adhere as to be practically an
integral part thereof, instead of being free, and nipples of insulating material.
similar to that comprising the inner lining of the interior conduit are arranged to
project into and meet said insulating lining B, so that the perfect insulation and
hermeticity which is the chief object of my invention, may be preserved.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is;
First. In joint boxes for conduits carrying electrical conductors, the combination
of a metallic box A, with an insulating lining B, fitted with any number of outlets a
Figures 1, 2 and 3 and a cover E substantially as herein described and shown by
the appended sheet of drawings.
Second. In jointing boxes for conduits carrying electrical conductors, the method of,
and means for attaching any kind or type of electrical fitting by means of a stud s
to which the insulating base l' of the fitting of any kind, is fixed, with suitable.
connections, in combination with a metallic box A with an insulating lining B and
any number of outlets a sutially as herein described with reference to the
appended drawings.
Third. In jointing boxes for conduits carrying electrical conductors, the methods
of, and means for affixing a cover E and securing hermeticity, upon a box A, with
an insulating lining B, substantially as herein described with reference to the
drawings.
Fourth. In jointing boxes for conduits carrying electrical conductors, the arrange
ment and construction of a box A with an insulating lining B with any number
of outlets a, in combination with a cover E which may or may not be perforated
with one or more outlets F, substantially as herein described with reference to the
drawings.
FREDK. WALKER,
73, St. Stephen's Road, Upton Park, London, E.,
Agent for the Applicant.