Improvements in Metallic Packing Mechanism for Reciprocating or Rotating Rods.
Year: 1898

page_text: Date of Application, 29th Apr., 1898-Accepted, 30th July, 1898
COMPLETE SPECIFICATION.
Improvements in Metallic Packing Mechanism for Reciprocating or
Rotating Rods.
I, WILLIAM EDGAR PLUMMER, of Soho Works, Thornton Road, Bradford, in
the County of York, 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:-
This invention relates to metallic packing mechanism for piston rods, valve
spindles and other reciprocating or rotating rods.
It applies to metallic packing mechanism in which use is made of a series of
rings which are arranged to fit the moving rod and also to fit into a conveniently
arranged chamber or stuffing box.
It is especially applicable to those forms of metallic packing mechanism in
which the rings above referred to are arranged to fit inside a larger containing
ring, prepared with a suitable chamber, the whole being so designed as to permit
the packing rings and the outer containing ring to float or vibrate with the lateral
movements of the rod. There are several well known adaptations of this idea
which it is not necessary to particularise. In most of these forms of metallic
packing mechanism the packing rings are arranged wholly or partly upon the
wedge or cone principle. By this means the pressure, which is usually applied to
the rings in a direction parallel to the line of the rod, is partly diverted and the
rings are caused to press against the rod and also against the walls of the containing
chamber.
This invention relates to an improved method of making these conical or wedge
shaped rings and their containing chamber.
Referring to the sheet of drawings, in which the same letters refer to the same or
similar parts.
Figure 1 is a section through a set of packing rings and their containing
chamber, and ring or cup.
Figure 2 is an end elevation of the same rings and cup.
Figures 3, 4, 5, 6 and 7 are cross sections through several different types of
metallic packing mechanism, showing the manner in which this invention may be
carried out.
This
Referring to Figure 1. This shows a section through a containing ring or
cup A such as is used in connection with these forms of metallic packing
mechanism which are arranged to permit lateral or radial motion to the rod.
cup is arranged with a chamber to contain the packing rings B, C and D which
are also shown in section.
In all previous designs it has been the custom to make the containing chamber
parallel to the rod throughout its entire length and thus depending upon the
conical male and female formation of the rings to tighten them on the rod when
end pressure is applied, or the chamber has been made partly parallel to the rod
and partly inclined at an angle thereto. In this invention the containing chamber
is made with two distinct and separate inclinations to the rod, and the packing

page_text: rings are of course made to correspond. This arrangement will be readily understood
from the drawing, where it will be seen that the chamber is made wide at one end
and that the surface is then inclined at a sharp angle to the rod, for some distance,
when the degree of inclination is increased until the rod is reached. This arrange-
ment of the rings and chamber, with two different degrees of inclination to the rod
is novel and exceedingly advantageous and ensures all the rings having a firm
contact with the rod whilst decreasing the tendency for the rings to be forced
through the chamber when pressure is applied, as is often the result when the
rings and chamber are made with only one angle of inclination to the rod.
It will be seen from Figure 2 that a small portion E, E1, E2, is cut out of each ring
so as to enable such rings to maintain a better contact with the rod and also to
advance in the chamber to make up for any wear which may take place, or these
rings may be cut in halves and may be arranged with dowel pins to secure their
remaining in their proper relative positions.
In Figure 1 the surface FG is inclined at an angle of 15 degrees to the rod J,
and the surface G H at an angle of 45 degrees, also to J, but it must be clearly
understood that i do not confine myself to the particular inclination mentioned as
may vary same without departing from the principle of the arrangement.
Figure 3 shows a complete arrangement of metallic packing of well known type
in which this invention is employed, the rings and the containing cup being
kept in their relative positions by means of the spring K and the follower L. The
spring also serves to keep the containing cup in contact with the ball and socket
ring M, the whole being enclosed in the outer case N.
Figure 4 shows a modification of this invention wherein the containing ring A
is made with its internal surface partly parallel to the rod and also inclined to the
rod at the two degrees of inclination as shown in Fig. 1.
The packing rings are varied in arrangement to suit this alteration in the shape
of the chamber, and the ring D2 is made conical to coincide with the conformation
of the follower ring L. This follower L and ring D2 are shown with a single
degree of inclination to the rod but I may make them with two degrees as shown in
Figure 1. In this particular packing the pressure is regulated from the outside
by means of studs, nuts and springs and transmitted by the gland and the
follower L to the several packing rings.
Figure 5 shows another modification of the invention wherein two sets of cups
and packing rings are employed, with a suitable spring K between, to keep the
parts in position, the containing cups being spherical on part of their exterior
surfaces.
Figure 6 shows an arrangement of the invention with small springs to keep the
parts in their respective places and with the external surface of the containing
cup A, made spherical to fit into the socket ring P; the whole being contained
within the outer case N.
Figure 7 shows the packing rings BC and D arranged to fit into a suitable
chamber in the outer gland N, the spring K and follower L keeping the parts in
position.
The chamber and packing rings are arranged in accordance with this invention
but the containing ring capable of moving laterally is here dispensed with.
The number of packing rings and the outer form of the containing ring may be
altered if thought desirable.
I wish it to be clearly understood that I do not confine myself to the exact
details shown in the drawings. Modifications thereof may be made without
departing from the principle of the invention.
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:
1. In metallic packing mechanism the arrangement of an annular chamber
with its surface inclined at two different angles to a central axis or rod, and the

page_text: combination therewith of suitably shaped metallic rings all as herein particularly
shown and described.
2. In metallic packing mechanism the arrangement of an annular chamber
with its surface partly parallel to and partly inclined at two different angles to a
central axis or rod, and the combination therewith of suitably shaped metallic
rings, as herein particularly shown and described.
3. In metallic packing mechanism the combination of the outer cases, glands,
springs, ball and socket joints, follower rings and other parts more or less of such
packings as are capable of lateral or radial movement, with the containing cup
or cups having their interior conical surfaces arranged according to Claims 1 and 2
and with the packing rings to fit into such containing cups, all as herein shown and
described.
4. In metallic packing mechanism the combination with the outer glands or
cases, springs, followers, and other parts of such packings as are not capable of
lateral motion, of the packing rings arranged at two different angles of inclination
to a central axis, or rod, and a suitably arranged chamber for such rings in the
gland case, or stuffing box, all as herein shewn and described.
1000
the 9th way
WM. BROOKES & SON,
55 & 56, Chancery Lane, London, Agents for the Applicant.