Improvements in Conduit Inspection Fittings for Electric Wiring.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Conduit Inspection Fittings for Electric Wiring.
I, THOMAS TAYLOR, of Crown Works, Hooper Street, Spring Hill, in the City
of Birmingham, Manufacturer, do hereby declare the nature of this invention
to be as follows:-
-
This invention relates to improvements in conduit inspection fittings for
electric wiring. and refers more particularly to what are known as junctional
boxes, tee parts and bends, in which an aperture is made so that from time to
time the wiring &c. inside may be examined.
Now the object of this invention is to provide improved means for closing
such apertures, but which will also permit of ready opening for inspection.
According to this invention the boxes or fittings having these apertures are
usually made of cast metal, and to such my invention is more directly applicable,
but in some cases they may be of wrought stamped metal. The shape of such
inspection aperture is governed very much by the general shape of the fitting
inasmuch as an opening as large as permissible is desirable. Such apertures of
any one pattern or size are made as nearly as possible of interchangeable similarity.
A flat joint making surface is provided exteriorly around the edge of such
aperture which is preferably ground flat and smooth.
I now cut out and stamp from sheet metal (steel preferably) a cover having
a depending vertical flange or rib which conforms to and fits the shape of the
aperture and further having a horizontal flange which when the said cover is
pushed tightly into the aperture rests flat upon the ground surface around the
aperture, so that by placing lead or other suitable substance upon such surfaces
a water tight joint is readily made. In this vertical wall or flange I further
provide bulged out parts-say perhaps three or more-which will serve to more
readily accommodate any slight irregularities in size or shape of the aperture;
or in some cases if prefered, such projections may be formed upon the inside
edge of the aperture. In either case the object being to afford a somewhat tight
springy pushing of the lid or cover.
Dated thi 1711 1
בד A
1000
CHARLES T. POWELL,
Applicant's Agent,
COMPLETE SPECIFICATION.
Improvements in Conduit Inspection Fittings for Electric Wiring.
I, THOMAS TAYLOR, of Crown Works, Hooper Street, Spring Hill, in the City
of Birmingham, Manufacturer, 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 improvements in conduit inspection fittings for

page_text: electric wiring, and refers more particularly to what are known as junctional
boxes, tee parts and bends and elbows, in which an aperture is made, so that
from time to time the wiring be examined &c.
Now the object of this invention is to provide improved means for closing
such apertures, but which will also permit of ready opening for inspection.
I have appended hereunto an illustrative sheet of drawings to explain more
clearly this my invention, in which :-
Fig. 1, is a front view of a junctional box in frequent use, and to which this
my invention is shown applied.
Fig. 2, is a sectional view in elevation on line A-B of Fig. 1.
Fig. 3, is a front view of the cover for the opening in the said box.
Fig. 4, is a sectional view of the cover on line C-D Fig. 3.
Fig. 5, shews the application of this my invention to a modified shape of fitting
viz. that of a bend or elbow.
Fig. 6, is a plan view, and Fig. 7, a sectional view on line E, F, of the
cover for such bend or elbow.
According to this invention the boxes or fittings 9, having apertures 10, are
usually made of cast metal, and to such my invention is more directly applicable,
but in some cases they may be of wrought stamped metal. The shape of such
inspection aperture 10, is governed very much by the general shape of the fitting
inasmuch as an opening as large as permissible is desirable. Such apertures of
any one pattern or size are made as nearly as possible of interchangeable
similarity. A flat joint making surface 11, is provided exteriorly around the
edge of such aperture which is preferably ground flat and smooth.
now cut out and stamp from sheet metal (steel preferably) a cover 12, having
a depending vertical flange or rib 13, which conforms to and fits the shape of
the aperture 10, and further having a horizontal flange 14, which, when the said
cover is pushed tightly into the aperture rests flat upon the ground surface
around the aperture, so that by placing red lead, or other suitable substance
upon such surface, a water tight joint is readily made. In this vertical wall
or flange 13, I further provide bulged out parts 15,-say perhaps three or more
-which will serve to more readily accommodate any slight irregularities in size
or shape of the aperture; or in some cases if preferred, such projections may be
formed upon the inside edge of the aperture 10, instead of upon the flange 13.
In either case the object being to afford a somewhat tight springy pushing in of
the lid or cover.
As before intimated in Figs. 5, 6 and 7, I have shown the application of this
my invention to an elbow or the like fitting, in which it will be seen that the
shape only of the aperture and its cover is modified to suit the fitting, but in
other respects it is carried out in the same manner as described for that shown
in Figs. 1 to 4.
Having now particularly described and ascertained the nature of this my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1. In junctional boxes or their like for electric wiring, having inspection
openings such as 10, the use and employment of springy stamped metal covers 12,
having bulged parts 15, all substantially as set forth and shown.
2. In junctional boxes or their like for electric wiring the combination com-
prising apertures such as 10, having bulged out parts such as 15, around its
edges, and springy stamped covers 12, substantially as set forth and shown.
Dated
B1-1 1000
CHARLES T. POWELL,
Applicant's Agent, 158, Edmund Street, Birmingham.