Improvements in Joint Boxes for Electrical Installations, and Connections therefor.
Year: 1899

page_text: Date of Application, 13th May, 1899
Complete Specification Left, 1st Feb., 1900-Accepted, 12th May, 1900
TUITIVATION.
Improvements in Joint Boxes for Electrical Installations,
and Connections therefor.
I, GEORGE WILKINSON, of No. 12, Dragon View, Harrogate, in the County of
York, England, Engineer, do hereby declare the nature of this invention to be
as follows:-
My invention relates to certain improvements in joint boxes based upon my
Specification in application for Letters Patent of prior date, No. 22190, dated
October 21st, 1898 in which the inner box is independently fixed in respect of
the outer box, and the main leads are carried into said box in a vertical direction
from below the base thereof.
The objects of my present invention are to produce a smaller and more
compact box, and to afford a method of attachment which completely earths
the two boxes, and also holds the main cable in position; and the general arrange-
ment of parts by means of which the contacts and connections are readily
accessible, and capable of easy manipulation for testing, conversion of the cir-
cuits or the like, the insulation and hermeticity being always preserved.
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
joint box with inner and outer boxes in situ. Figure 2 is a detached view
drawn to a larger scale showing the method of and means for earthing the
boxes and gripping the main cables. Figure 3 is a detached sectional view of
the method of fixing the cover of the inner box. Figure is a view of a top
removeable connection board partly shown in section. Figure 5 is an elevation
of a joint box according to my said invention partly shown in section.
In carrying my invention into effect the inner box B, Figure 1 is screwed down
from the inside to carrying brackets ii, which are attached to the inside of
the outer box A by set screws a¹. This is shown by the detached view Figure 2
drawn to a larger scale. Beneath the bracket i is an extension web, carrying a
clip which embraces the lead covering of the incoming main cable Fi, thus
holding it rigidly in position for the box B to be placed over it, and passing it
through the portway L. This arrangement also effectively "earths" the inner
box B and outer box A. The smaller service cables, or branch main, F" Fin
need not be so clamped, as they are much smaller and more easily manipulated.
The lid C of the inner box B is fixed and made water tight by being pressed
down upon the face of the box by swivel bolts Z and wing nuts t, as shown by
Figure 3 drawn to a larger scale, the bolts being pivotted to B at u, and dropping
into lugs w and when screwed up, compressing a pad or continuous rubber ring y
between said cover C and the edge of the box B. The portways L¹ L" Figure 5
are luted right up to the level of the top side of the teak board 14, Figure 5
with water proof insulating compound after the cables and fittings are in position,
thus preventing moisture rising through the bottom of the box B. The outer
conductor connecting links R R R" Figure 1 and 15 Figure 5 are arranged

page_text: to meet various conditions of application and for instance R is entirely removed
when a four way box is desired two short links like R¹ and R" being substituted
therefor. The clamping discs of said outer conductor are furnished with inter-
nally screwed metal nipples 11 receiving the porcelain insulators g, which are
externally voluted. The inner conductors n with their insulation left on, pass
through the porcelain insulators g, and said conductors n are "barèd" at the
top as shown. The upper part of each insulator g is screwed to carry split bell
shaped contacts 10, which in turn are furnished with screwed nipples 12 and
nuts 13, to clamp the protruding "barèd" end of the inner conductors n.
Figure 4 shows a board 4 (not drawn to scale) which carries contact rings 7,
which are connected by strip conductors 5. The rings are flanged at 6, and
vulcanite or like insulating washers 8 inserted for better insulation. The bore 3
of the rings is sufficiently large to press easily upon the split bell shaped
contacts 10 Figure 5, and the board 4 being fitted with a handle H it is readily
removeable when the cover C of the inner box B is raised. The holes in said
board 4 receiving the contact rings 7 may be bored free, and not bushed as shown
by the drawing, this arrangement admitting of said rings taking up any centre
or plane. The outsaid of said rings are screwed to take porcelain caps T T T
to protect the bared ends of the inner conductors n. A small contact spring
may be fixed to each bell shaped contact 10, (shown by the centre one Figure 5)
for the purpose of taking the spark when the contact is broken by removing the
board 4. Where it is not desired to use the joint box as a switch box also, I
dispense with the bell shaped contacts and rings 7 and use a clamp vv Figure 1
gripping the "barèd" ends of the inner conductor and being joined up by strips.
I may vary the shape and general arrangement of the several parts of the
joint box according to my invention without departing from the essential
features thereof.
Tated th: 20th dow of 1000
FREDK. WALKER,
73, St. Stephen's Road, Upton Park, London, E.,
Agent for the Applicant.
Improvements in Joint Boxes for Electrical Installations,
and Connections therefor.
:
I, GEORGE WILKINSON, of Kirkside, Bilton, Harrogate, late of No. 12, Dragon
View, Harrogate, in the County of York, 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 joint boxes for electrical
connections, based upon my application for Letters Patent of prior date riz.
22190 dated October 21st 1898, in which the inner box is independently fixed
relatively to the outer box, and the main leads are carried into said box in a
vertical direction from below the base thereof.
"
The objects of my present invention are to produce a smaller and more com-
pact box and to afford a method of attachment which completely "earths the
two boxes and also holds the main cables in position; and the general arrange-
ment of parts, by means of which the contacts and connections are readily
accessible, capable of easy manipulation for testing, conversion of the circuits
or the like, the hermeticity and insulation being always preserved.
In order that my invention may be the better understood, I have appended

page_text: ور
a sheet of drawings to my Provisional Specification in which Figure 1 is a plan
view of a joint box with inner and outer boxes in situ. Figure 2 is a detached
view drawn to a larger scale showing the method of and means for " earthing
the boxes and also gripping the main cable. Figure 3 is a detached sectional
view showing the method of fixing the cover of the inner box. Figure 4 is a
view of a top removeable connection board partly shown in section. Figure 5
is an elevation of a joint box according to my invention, partly shown in section.
In carrying my invention into effect the inner box B, Figure 1 is screwed down
from the inside to carrying brackets which are attached to the inside of the
outer box A by set screws a¹. This is shown by the detached view Figure 2
drawn to a larger scale. Beneath the bracket i is an extension web carrying a
clip which embraces the metallic covering of the incoming main cable F',
thus holding it rigidly in position, for the box B to be placed over it, and passing
it through the portway L. This arrangement effectively "earths" the inner
box B and outer box A. The smaller service cables or branch mains F F
may be brought in from below and clamped in any suitable manner. The lid C of
the inner box B is fixed and made water tight by being pressed down on the face
of the box by swivel bolts z and wing nuts t as shown by Figure 3, drawn to a
larger scale the bolts being pivotted to B at u, and dropping into lugs w, and
when screwed up compressing a pad or continuous rubber ring y, between said
cover C and the edge of the box B. The portways L L L" Figure 5, are luted
right up to the level of the teak board 14, Figure 5 with waterproof insulating
compound after the cables and fittings are in position, thus preventing moisture
rising through the bottom of the box B. The outer conductor connecting
links R R R", Figures 1 and 5, are arranged to meet various conditions of
application, and for instance, R is entirely removed when a four way box is
desired, two short links like R¹ and R being substituted therefor.
clamping discs of said outer conductor are furnished with internally screwed
metal nipples (11, Figure 5) receiving the porcelain insulators g which are
externally voluted. The inner conductors n with their insulation left on; and
passed through the porcelain insulators g, and said conductors n are
at the top as shown.
The
"bared"
The upper part of each insulator is screwed to carry split bell shaped con-
tacts 10, which in turn are furnished with screwed nipples 12 and nuts 13
to clamp the protruding barèd end of the inner conductors n¹ Figure 4 shows
a board 4 (not drawn to scale) which carries contact rings 7, which are connected
by strip conductors 5. The rings 7, are flanged at 0, and vulcanite or like
insulating washers 8 are inserted for better insulation.
The bore 3 of the rings 7 is sufficiently large to press easily upon the split
bell shaped contacts 10 Figure 7, which afford a certain amount of elasticity
and also maintain a true contact by friction. The board 4 is fitted with a
handle H which is readily removeable when the cover C of the inner box B is
raised. The holes in said board 4, receiving the contact rings 7, may be bored
free, and not bushed as shown by the drawing, this arrangement admitting of
said rings taking up any centre or plane. The outside of said rings are
screwed to take porcelain caps T T T to protect the barèd ends of the inner
conductors n. A small contact spring may be fixed to each bell shaped contact 10
(shown by the central figure, Figure 5) for the purpose of taking the spark
when contact is broken by removing the board 4.
Where it is not desired to use the joint box as a switch box only; I dispense
with the bell shaped contacts and rings 7, and use suitable contact clamps
(Figure 1), gripping the barèd ends of the inner conductor and being joined
up by metallic strips or similar conductors affording sufficient flexibility.
I may vary the shape and general arrangement of the several parts of the
joint box according to my invention without departing from the essential
features thereof.

page_text: 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
First. In joint boxes for electrical connections the combination of an inner
box within, an outer box, both of which are "earthed" with the main and
branch leads carried vertically thereunto and supported substantially as herein
described and shown by Figures 1 and 2 of the appended drawing.
Second. In joint boxes for electrical connections as referred to in the pre-
ceding claim, the employment of jointed connecting bars R R R substantially
as and for the purposes herein set forth and described and shown by the drawings.
Third. In joint boxes for electrical connections as referred to in the pre-
ceding claims, the method of and means for carrying a concentric conductor F
vertically into the box, supporting and "earthing" it by a clip 7; and luting it
into said box at L, substantially as herein described and shown by Figure 2 of
the appended drawings.
Fourth. In joint boxes for electrical connections the combination of a board
or the like 4, Figure 4, having contact rings 6 and insulating caps T T T
with bell shaped contacts 10 Figure 5 and clips 13 for receiving and clamping
the inner conductor of the concentric lead, substantially as herein described and
shown by the drawings.
Fifth. In joint boxes for electrical connections the employment of simple
clamps for holding the inner conductor of a concentric cable instead of the
method of and means for so doing referred to in the preceding claim, as shown
by Figure 1 of the appended drawings.
Dated this 22nd day of January 1900.
FREDK. WALKER,
73, St. Stephen's Road, Upton Park, London, E,
Agent for the Applicant.