Improved Gland Joint for Electrical Conductors.
Year: 1893

page_text: Date of Application, 15th Apr., 1893
Complete Specification Left, 15th Jan., 1894-Accepted, 10th Mar., 1894
PROVISIONAL SPECIFICATION.
Improved Gland Joint for Electrical Conductors.
I, WALTER CLAUDE JOHNSON, of 14 Union Court, in the City of London,
Electrical Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to an improved construction of glands for insuring an air or
watertight passage of electric conductors into and from a chamber, box, or other
receptacle which it is desirable, to maintain air and watertight, more particularly
for leading electrical conductors or cables through cases containing electrical
instruments or apparatus, such as electricity meters, transformers, subterranean
joint boxes, and the like.
For this purpose, the chamber, box or other receptacle is made with a gland, the
internal surface of which is made slightly conical or trumpet mouthed, and a ring
of caoutchouc or other suitable elastic material, either solid or hollow, having been
fitted upon the end of the conductor, or placed in the mouth of the gland the
conductor is forced into the gland, whereby the ring is made to turn over with a
rolling motion on the conductor and at the same time to roll inwards upon the
tapering bore of the gland, thus becoming gradually more and more compressed
between the conductor and the gland, so as to form automatically a perfectly air
and watertight joint. The bare end of the conductor is then secured to the
terminal or other device in the chamber in the usual manner.
For convenience of inserting the conductor into the rubber ring the insulation on
may be slightly tapered away from the bare end which is to be connected to the
instrument or apparatus.
At or near its innermost end the gland may advantageously be formed with a
slight circular groove in which the rubber ring will come to rest and by which it
will always be maintained in its proper position.
By means of this invention, air and watertight joints are quickly, easily, cheaply
and effectually made without interfering with the insulation.
The joint being entirely formed by the elastic ring, it is not necessary for the
conductor to be a good fit in the hole in the case; consequently it is not necessary
that the axis of the conductor shall correspond with that of the gland, as the
elastic ring forms a flexible joint and allows of the cable being put in at a considerable
angle to the axis of the gland.
4
By using an elastic ring of a large or a small section, a small or a large cable
may be inserted into the same opening.
Dated this 15th day of April 1893.
ABEL & IMRAY,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improved Gland Joint for Electrical Conductors.
I, WALTER CLAUDE JOHNSON, of 14 Union Court, in the City of London,
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 an improved construction of glands for insuring an air or
watertight passage of electric conductors into and from a chamber, box, or other
receptacle which it is desirable to maintain air and watertight, more particularly
for leading electrical conductors or cables through cases containing electrical
instruments or apparatus, such as electricity meters, transformers, subterranean
joint boxes and the like.
For this purpose, the chamber, box or other receptacle is made with a gland, the
internal surface of which is made slightly conical or trumpet mouthed, and a ring
of caoutchouc or other suitable elastic material, either solid or hollow, having been
fitted upon the end of the conductor, or placed in the mouth of the gland, the
conductor is forced into the gland, whereby the ring is made to turn over with a
rolling motion on the conductor and at the same time to roll inwards upon the
tapering bore of the gland, thus becoming gradually more and more compressed
between the conductor and the gland, so as to form automatically a perfectly air and
watertight joint. The bare end of the conductor is then secured to the terminal
'or other device in the chamber in the usual manner.
.
For convenience of inserting the conductor into the rubber ring the insulation
on it may be slightly tapered away from the bare end which is to be connected to
the instrument or apparatus. At-or near its innermost end the gland may
advantageously be formed with a slight circular groove in which the rubber ring
will come to rest and by which it will always be maintained in its proper
position.
By means of this invention, air and watertight joints are quickly, easily, cheaply
and effectually made without interfering with the insulation.
The joint being entirely formed by the elastic ring, it is not necessary for the
conductor to be a good fit in the hole in the case; consequently it is not necessary
that the axis of the conductor shall correspond with that of the gland, as the elastic
ring forms a flexible joint and allows of the cable being put in at a considerable
angle to the axis of the gland. By using an elastic ring of a large or a small
section, a small or a large cable may be inserted into the same opening.
In the accompanying drawing are shewn various forms of gland joints constructed
according to my above described invention Fig. 1 shews a box a with. glands b
formed with tapering inner surface into the mouth of which is introduced a caoutchouc
or other elastic packing ringe so that on inserting the insulated conductor d into
the ring, and pushing it forward, the ring e will roll inwards into the gland,
becoming gradually compressed, so as to form a perfectly tight joint between the
conductor and the gland. Fig. 2 shews a similar construction of gland with a
circular groove e formed at the inner end thereof, so that the ring c on arriving at
that point will spring into the said groove as shewn, and will thus be maintained in
that position. Fig. 3 shews the same form of gland as at Fig. 1 but with a hollow
elastic ring e instead of a solid one. In the gland shewn at Fig. 4, only the outer
end is made trumpet mouthed, so as to enable a ring c of a larger size than the
interior of the gland to be forced in under corresponding compression as indicated
by the dotted and full positions. The opening of the box is made larger than in the
preceding cases, so as to allow the conductor d to assume a more or less angular
position in passing in through the gland as indicated by the dotted lines, the
ring c maintaining the tight joint in such positions owing to its elasticity and
compressed condition.

page_text: Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In gland joints for electrical conductors, the combination of an internally
tapered or trumpet mouthed gland with an elastic packing ring through which the
conductor is introduced so as to form a tight joint by means of the compression of
the ring between the conductor and the gland substantially as described.
2. In a gland joint such as is referred to in the preceding claim, forming a
circular groove at or near the inner end of the gland into which the elastic ring
springs so as to be held in position thereby substantially as described.
Dated this 13th day of January 1894.
ABEL & IMRAY,
Agents for the Applicant.