Improvements in Joint-making Packing.
Year: 1893

page_text: te of Application, 24th Nov., 1893-Accepted, 30th Dec., 1893
COMPLETE SPECIFICATION.
Improvements in Joint-making Packing.
I, REINHOLD KRÜGER, of 102 Friederichstrasse Berlin, in the Empire of
Germany, 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 packing ring, which is
capable of safely resisting any steam pressure, provides a tight joint without
excessive strain, and also does not lose its efficiency even when the joint is
frequently broken.
The invention consists of a hard metal core with a soft packing material combined
in such a manner that the hard metallic core and the packing material cannot be.
detached or separated the one from the other, whilst at the same time cracks or
splits in a direction transverse to the width of the packing are avoided.
In the accompanying drawing which illustrates my invention,
Figure 1 is a view in plan illustrating the hard core of my improved packing
ring.
Figure 2 is a similar view illustrating the combination of the hard metallic core
and the soft material showing how the latter is applied to the former, (in practice
the cords are not made as thin as shown in the drawing, which is done for the sake
of distinctness), and Figure 3 is a view in section through the improved packing
ring.
Throughout the views similar parts are marked with like letters of reference.
The hard metallic core b is made in the form of a disc ring, and it has a
series of holes a formed through it as shown by the drawing. Through these
holes a the cords d of suitable material are braided or threaded. It is
immaterial how the cords are braided or threaded through the holes a, but it is
preferable to braid or thread one cord through all the rows of holes and not to use
a separate piece of cord d for each row. The reason why this construction is
to be recommended, is that in this case only the two ends of the cord have to be
fastened, whereas if more than one length of cord is used the number of fastenings
is increased.
'
To facilitate the use of but one length of cord the rows of holes may be arranged
in spiral form to facilitate the braiding or threading.
The action of this packing ring is as follows:-When the packing ring is placed
between the flanges to be packed and the flanges are screwed tightly together the
packing cords are squeezed flat and there is formed at both sides of the hard
metallic core a a coherent or continuous surface c which has the appearance of
an ordinary packing plate, but this similarity is solely external and my improved
packing ring has considerable advantages in use over the packing plates or discs
which are merely placed on metal rings.
This
With the packing rings at present employed a permanent tight joint cannot be
depended on because they are either forced out laterally, or crack or tear, but
with this improved packing ring this contingency cannot happen because the
packing is firmly held together by and connected to the hard metallic core.
same feature also distinguishes my improved packing ring from those packing discs
which are cemented to the metal rings, as in these the adhesive medium rapidly
becomes destroyed in consequence of the different expansion of the materials
employed, the result being that the packing disc is forced out by the constant
steam pressure, and leaky joints result, while with packing rings constructed
according to my invention the steam pressure cannot force out the packing because
the latter is interwoven with the hard metallic core. It will be obvious that in

page_text: case of repair, my improved packing ring has the advantage that only the packing
need be replaced, whilst the hard metallic core can be used over and over again.
A further advantage that results from the use of my improved packing ring is that
the packing disc cannot possibly become forced out from between the flanges of the
joint.
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
--
1. The improved packing ring substantially as hereinbefore described and
illustrated by the accompanying drawing.
2. A packing ring consisting essentially of a hard metallic core in the form of a
disc ring and having a series of holes through it, through which is braided or
threaded one or more cords of suitable soft packing material, as and for the purpose
hereinbefore set forth.
3. In a packing ring, the combination of the hard metallic core b having a
series of holes a through it, and of a soft packing material in the form of
cords d braided or threaded through the holes in the core b, as and for the purpose
set forth.
Dated this 94th day of November 1893
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Associate Agent for the Applicant.