Improvements in Packing for Stuffing Boxes, Flanges, and like purposes.
Year: 1899

page_text: Date of Application, 6th Apr., 1899-Accepted, 8th July, 1899
COMPLETE SPECIFICATION.
Improvements in Packing for Stuffing Boxes, Flanges, and like
purposes.
We, HERMANN KIRSCHNING and FRIEDRICH ALTSCHWAGER, both of 97 Fehrbelliner
Strasse, Berlin, in the Empire of Germany, Manufacturers, 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 packing in the form of rings, ropes or the like of asbestos
threads of which two groups or strands are twisted around a serpentine wire in such
a manner as to interlock and retain each other.
The improved arrangement, as compared with packing having a metallic core, has
great advantages. The wire imparts to the packing ring or strip its form and solidity,
together with great elasticity whereby the wire is enabled to freely expand and
contract, while the packing may be bent or compressed in any direction. The above
mentioned inethod of twisting provides a strong support for the asbestos threads onto
the wire and so obviates the tearing or bursting of the packing through great pressure.
As the wire core is covered on all sides by the asbestos threads the packing material
is capable of adapting itself to any surface and especially for use in stuffing boxes
when it presses both on the walls of the stuffing-box and on the piston rod and thus
forms a tight packing without damaging the piston rod. Another important point
is that the packing resists the action of steam, acid and alcali. The rings or strips
can be manufactured in any desired size or thickness and it is a consideration that
the same, by merely pressing them, may be formed with a circular, oval, or
square or other section so as to suit the particular purpose for which they are to be
employed.
The invention will be readily understood by reference to the accompanying
drawings in which
Figure 1 shows a packing ring and
Figure 2 shows a length of packing rope.
Figures 3, 4 and 5 show short portions of a packing ring drawn to a larger scale
and in various positions for illustrating the manner of winding.
Figure 6 shows a packing ring after compression, and
Figures 7, 8 and 9 show the application of these improved packing rings or
ropes.
In manufacturing the packing we use a serpentine wire a and we apply two bundles
of asbestos threads and twist them in opposite directions around the wire in such a
manner as to cause the threads of the group b to be always placed in the bend d of
the wire. In this manner the threads of the one group are always covered and
retained by those of the other group. By this means a plaiting is produced having
great firmness without interfering with the elasticity of the ring, rope or strip and
covering the wire entirely. Figures 3 to 5 show clearly the manner of twisting the
threads. The threads of the group c are wound around the wire a, Figure 3, and
tightly lodged in the bend e as shown in Figure 4, thereupon the group is similarly
wound round the wire as shown in Figures 4 and 5 and tightened into the bend d.
013

page_text: This alternate winding and twisting is continued until the ring, rope or strip is
completed.
The pressing of the ring into the form as shown in Figure 6 may be effected in
any convenient manner providing the shape and the cross-section thereof is suitable
for the purpose for which it is required.
Before and after the pressing of the rings they may be impregnated with a solution
of caoutchouc or rubber so as to render them thoroughly impervious to steam and
liquids; the elasticity remaining unaffected.
For stuffing boxes the packing rope is used in the manner shown in Figures 7
and 8 when the high elasticity is an especial advantage. The rope is applied spirally
around the rod so that the windings lay flat against one another. In this manner a
packing for stuffing boxes is obtained which is of great reliability and durability.
The advantage accruing from the resiliency or yielding of the packing ring will be
clear from Figure 9.
Ordinarily in order to insert or remove the packing ring in flanged tubes the bolts
have to be taken out entirely while with this improved packing they only need be
loosened. The packing ring is pressed into an oval shape and after being placed
between the bolts its natural resiliency causes it to resume its circular shape. This
nanner of introducing the packing and the consequent shortening of the interruption
in the service thereby is of great importance.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
1. Packing rings ropes or the like having a resilient serpentine wire embedded in
its interior around which two groups of asbestos threads are wound in opposite
directions in the form of plaitings by drawing the threads of the one group into the
left hand recesses and those of the other group into the right hand recesses of the
serpentine wire, so causing thein to mutually bind one another and to cover the wire
all round.
2. Packing ring or the like as claimed in Claim 1 and pressed so as to have even
surfaces and of a shape or form to suit any particular purpose.
3. Packing ring or the like as claimed in Claims 1 or 2 treated with caoutchouc.
1
CLL
A1 1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.