Improved Metallic Packing for Pistons, Piston-rods, Valve-stems," and other Mechanical Devices.
Year: 1890

page_text: Date of Application, 31st July, 1890-Accepted, 20th Sept., 1890
COMPLETE SPECIFICATION.
Improved Metallic Packing for Pistons, Piston-rods, Valve-stems,"
and other Mechanical Devices.
I, RICHARD FLECK, of 31 Chaussec Strasse Berlin, in the Empire of Germany,
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:-
The invention relates to that class of packing for piston-rods, valve stems, pistons,
and other mechanical devices, which is composed entirely of metal, and it consists in
filling up the stuffing box or the annular groove of a piston with a number of funnel
shaped or conical rings of a compressible metal, in such way, as will be hereafter
particularly described, that the rods, pistons, etc., furnished with this new metallic
packing will be made absolutely tight against steam, water, air, etc., even at great
pressure.
+
In the accompanying drawing, in which all figures represent axil sections of stuffing"
boxes and of single parts of the packing,
Figure. 1 shows the packing composed of upright conical rings,
Figure 2 shows the packing composed of inverted conical.rings;
Figures 3 and 4 show the packing constructed of a number of rings of upright and
inverted conical shape combined,
Figures 5, 6 and 7 show different single rings of which the packing may be
built up.
It is a matter of experience that a conical ring of compressible metal, such as lead,
Babbit's metal, brass, and other similar compositions, if submitted to a pressure in
axial direction, will be enlarged in diameter while the central hole is diminished in
diameter, and the metal itself is simultaneously upset more or less. This fact is
made use of in the present invention of the improved metallic packing.
The packing rings represented at Figure 1 are upright conical rings a, as shown
separately in Figure 5, with which the stuffing box s is filled. The lower rings a and
also the top ones touch the rod and the inside face of the stuffing box s. The
rings a¹ between these said rings a are of smaller outside diameter and are confined
or surrounded by a stiff and strong metallic pipe g, fitting loosely in the stuffing box s.
If the gland o of the stuffing box s is pressed down upon the contained rings a and a¹,
the said rings a, a¹, are forced down, the upper and lower rings a being pressed with
their inner edge against the rod and with the outer edge against the inside of the
stuffing box s, while the middle rings a are pressed with the inner edge against the
rod and with the outer edge against the inside face of the pipe g. By these means
the joint between the inner edge of the rings a and a', and the rod r, becomes
absolutely tight and also the joint between the outer edge of the rings a and the
inside face of the stuffing box s. As soon as the joint of the rod r becomes a little
slack by wear,
the screwing down of the gland o will force down the inner edges of
all the rings without altering their sliding surfaces, but will upset the compressible
metal forming them as much as the tightening requires. The pipe is used to
facilitate the extraction of the middle rings a' from the box s if required, which without
this provision would be sometimes very difficult and troublesome.
This construction is the substantial part of the invention, but it is clear that slight
alterations in the form or shape of the rings a, a¹, and the pipe g will not take such
altered packing out of the range of the invention.
As shown in Figure 2, the rings a, a, are of inverted conical shape and confined
In an auxiliary box g fitting tightly within the main box s. This auxiliary box g is
an equivalent of, and serves instead of, the pipe g of Figure 1, and may be used with
upright conical rings of the character shown in Figure 1, whilst the latter may be
sed with the auxiliary box g represented at Figure 2.
[ Price 61 1

page_text: In Figure 3 the stuffing box s is filled with double conical rings of the character
represented in Figure 6. The lower one a tightening against the-rod and the
inside face of the box s, the upper ones a¹ only against the rod r, as their outside
edges are confined by the stiff separate rings g, which here take the place of the
pipe g of Figure 1, or of the auxiliary box g of Figure 2.
In Figure 4 the rings a, a¹, are
derived also from the original cone.
lower ring a tightens against the rod
only against the rod r, they being
explained above.
of another, double conical, shape, but which is
Figure 7 represents one of such rings a'. The
and the inside face of the box s, the others a',
provided with separate confining rings g, as
For pistons, etc., the packing is constructed substantially in the same manner, only
that the rubbing surface is on the outside edge of the packing rings, instead of on the
inner edge.
The rings a, a', may be cast in moulds, turned out of solid rings of suitable metal
or stamped or spun of sheet metal.
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 :-
An improved metallic packing for piston rods, valve stems, pistons, etc., consisting
of differently shaped conical rings a a' of suitable compressible metal, with which
the stuffing box s is filled, and which are pressed by the gland o of the box with their
inner edge against the rod r, stem, etc., and with their outer edge against the inside
face of the box s, and a metallic confining pipe g, or ring or rings, or auxiliary box,
substantially as described and as shown in the drawing.
Dated this 31st day of July 1900.
RICHARD FLECK.
By Harris & Mills,
23, Southampton Buildings, London, Agents.