Metallic Packing for Stuffing Box.
Year: 1895

page_text: Date of Application, 12th Mar., 1895
Complete Specification Left, 11th Dec., 1895-Accepted, 11th Jan., 1896
Metallic Packing for Stuffing Box.
I, CHARLES HENRY LAWSON of 38 Victoria Buildings Manchester in the
County of Lancaster Mechanical Engineer do hereby declare the nature of this
invention to be as follows:-
This packing consists of a cylindrical metal shell, of a small enough outside
diameter to allow of its lateral movement in the stuffing box. This shell has a flange
at one end with a hole bored in it sufficiently large to allow the piston or rod to
move freely in it. The outside face of this flange is preferably faced with an anti-
friction metal. This face which is flat forms a true joint with the surface with
which it is in contact in the stuffing box.
The inner face of the flange is made inclined to the axis so that the thickness
of the flange increases towards the body of the shell. On this inclined face, two
or more concentric rings rest, the surfaces of these concentric rings which are in
contact with the inclined face of the flange being of a corresponding angle.
The concentric rings are made to accurately fit one within the other. The inner
diameter of the inner ring is bored to fit the piston or rod which moves within it.
The outer diameter of the outer ring fits the cylindrical shell loosely. These
concentric rings are each cut into two or more segments, & the joints between the
ends of the segments of the inner ring are arranged so as to break joint with those
in the outer ring, dowels or pins being used in the one set of segments fitting into
corresponding holes in the other set. The opposite faces of the concentric rings
are similarly inclined but in a reverse direction & in contact with these is a solid
ring suitably coned. The solid ring is bored internally to loosely fit the piston or
rod & turned on its outside diameter to accurately fit the cylindrical shell in
which it slides. The opposite face of this solid ring is also coned but in a reverse
direction & against this face another set of concentric rings are in contact. These
concentric rings are exactly similar to those already described. The whole of the
series of rings forming the packing is closed by a solid cover plate bored internally
to loosely fit the rod & turned on its outside diameter to accurately fit the cylin-
drical shell. The inner face of this cover plate is coned to correspond with the
bevelled faces of the last named concentric rings whilst the outer surface is flat &
bears against a corresponding surface on the inner end of the gland. The gland
in contact with the packing is held in place in the usual way by means of studs and
nuts with the exception that a spiral or similar spring is interposed between the
face of each nut & that of the gland on which the nut would otherwise rest.
nuts being screwed down, the springs are thereby compressed and sufficient com-
pression is given to each spring so as to make a sufficiently good contact between
the various surfaces to prevent any leakage taking place and at the same time to
allow any lateral movement of the packing due to irregular movement in
the rod.
The
The foregoing description has reference to packings in which lateral movement
is possible. In cases where it is desirable to allow a spherical movement, both the
top and bottom outer surface of the packing is made spherical in form. In this
case each spherical surface rests on a solid ring suitably formed to receive it while
the outer face of this solid ring is flat and corresponds to the flat end surfaces in
the first described arrangement. These solid rings together with all the surfaces

page_text: which come in contact with the rod are preferably made of or faced with an
antifriction metal.
Dated this 11th day of March 1895
metallic Packing for Stumng Box.
I, CHARLES HENRY LAWSON of 38 Victoria Buildings Manchester in the
County of Lancaster Mechanical 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 packing consists of a cylindrical metal shell A Figure I of a small enough
outside diameter to allow of its lateral movement in the stuffing box. This shell
has a flange B at one end with a hole bored in it sufficiently large to allow the
piston or other rod to move freely in it. The outside face C of this flange is
preferably faced with antifriction metal. This face which is flat forms a true joint
with the surface with which it is in contact in the stuffing box.
The inner face D of the flange is made inclined to the axis so that the
thickness of the flange increases towards the body of the shell. On this inclined
face two or more concentric rings E and F rest, the surfaces of these concentric
rings which are in contact with the inclined face of the flange being of a corre-
sponding angle. The concentric rings are made to fit accurately one within the
other.
.
The inner diameter of the inner rings E is bored to fit the rod which moves
within them. The outer diameter of the outer ring F fits the cylindrical shell
loosely. These concentric rings are cut into two or more segments and the joints
between the ends of the segments of the inner rings are arranged so as not to come
opposite the joints between the ends of the segments of the outer ring, dowels or
pins G Figure 2 being provided in the one set of segments fitting into corre-
sponding holes in the other set. The opposite faces H of the concentric rings are
similarly inclined but in a reverse direction and in contact with these is a solid
ring J suitably coned. This solid ring is bored internally to loosely fit the rod
and turned on its outer diameter to accurately fit the cylindrical shell A in which
it slides. The opposite face K of this solid ring is also coned but in a reverse
direction and against this face another set of concentric rings is in contact.
These
concentric rings are exactly similar to those already described. The whole of the
series of rings forming the packing is closed by a solid cover plate L bored
internally to loosely fit the rod and turned on its outer diameter to accurately fit
the cylindrical shell A. The inner face M of this cover plate is coned to
correspond with the bevelled faces of the last named concentric rings whilst the
outer surface is flat and bears against a corresponding surface on the inuer face
of the glaud. The inner surface of the outer of the two concentric rings F may
either be plain as shown on Figure I Sheet I or shaped similar to that shown on
Figure 3 Sheet 11. The number of complete sets of concentric rings varies from
one as shown in Figure 3 according to circumstances. The gland N in contact
with the packing is held in place in the usual way by means of studs and nuts with
the exception that a spiral or similar spring R is interposed between the face of
each nut and that of the gland on which the nut usually bears. The nuts being
screwed down thereby compress the springs and by this means enough compression
is given to each spring to insure a sufficiently good contact being obtained between
the various surfaces in order to prevent any leakage taking place while at the
same time allowing lateral movement of the packing. The foregoing description
has reference to packings in which lateral movement is possible. In cases where

page_text: it is desirable to allow a spherical movement, both the top and bottom outer
surface of the packing is made spherical in form as shown in Figure 3 Sheet 2.
In this case each spherical surface rests on a solid ring P suitably formed to
receive it whilst the outer face of this solid ring is inade flat, and corresponds to
the flat end surface O in the first described arrangement Figure I. These solid
rings P are preferably made of or faced with antifriction metal as well as all the
surfaces which come in contact with the rod.
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. In metallic packings for stuffing boxes and the like, the combination of a
ring, composed of one or more pieces of a section similar to that shown at F
Figure I of Sheet Number I of the accompanying drawing, with one or more
supplementary rings E each composed of one or more pieces substantially of the
form shown in Figure I of Sheet I of the accompanying drawings.
2. In metallic packings for stuffing boxes and the like, the combination of a
tee shaped ring composed of one or more pieces F with one or more supplementary
rings E each composed of one or more pieces substantially of the form shown in
Figure 3 Sheet 2 of the accompanying drawings.
3. In metallic packings for stuffing boxes and the like, the combination of a
complete set or complete sets of rings, as shown in Figures I and 3 of Sheets
Numbers I and 2 respectively, with the spherical surfaced outer rings substantially
as shown in Figure 3, Sheet 2 of the accompanying drawings.
4. The improvement in metallic packings for stuffing boxes and the like
substantially as hereinbefore described and illustrated in and by the accompanying
drawings.
Dated this Tenth day of December 1895.
CHARLES HENRY LAWSON.