AN IMPROVED PACKING FOR PISTON RODS, PUMP RODS, AND VALVE SPINDLES
Year: 1867

page_text: LETTERS PATENT to John McLintock, of Barnsley, in the County of York,
for the Invention of "AN IMPROVED PACKING FOR PISTON RODS, PUMP RODS,
AND VALVE SPINDLES."
Scaled the 23rd August 1867, and dated the 27th February 1867.
PROVISIONAL SPECIFICATION left by the said John M Lintock at the
Office of the Commissioners of Patents, with his Petition, on the 27th
February 1867.
I, JOHN MOLINTOCK, of Barnsley, in the County of York, do hereby declare
the nature of the said Invention for "AN IMPROVED PACKING FOR PISTON RODS,
PUMP RODS, AND VALVE SPINDLES," to be as follows:--
This Invention consists essentially in constructing a tight and durable packing
for the stuffing boxes of piston rods, pump rods, and valve spindles of vulcanized
india-rubber or other suitable elastic material faced or lined with metal on the
inner or rubbing surface of the packing.
In carrying out my Invention in practice I construct a split ring of vulcanized
india-rubber and adapt to the inner or rubbing surface thereof a lining of
sheet copper, brass, or other suitable metal, which may be secured to the
india-rubber ring by having tongues formed upon the metal lining, and bending
such tongues over the upper and under surfaces of the ring. The junction
edges of the ring and metal lining are bevelled or stepped so as to overlap
each other and prevent the escape of steam or other fluid at the joint. This

page_text: compound packing ring is introdnced into the ordinary stuffing box, and
is compressed or tightened up as required by the usual gland and tightening
screws.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John McLintock in the Great Seal Patent Office on the
24th August 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
MCLINTOCK, of Barnsley, in the County of York, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-seventh day of February, in the year of our
Lord One thousand eight hundred and sixty-seven, in the thirtieth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said John M Lintock, Her special license that I, the said John
M'Lintock, my executors, administrators, and assigns, or such others as I,
the said John M°Lintock, my executors, administrators, or assigns, should
at any time agree with, and no others, from time to time and at all times
thereafter during the term therein expressed, should and lawfully might make,
use, exercise, and vend, within the United Kingdom of Great Britain and
Ireland; the Channel Islands, and Isle of Man, an Invention for " AN IMPROVED
PACKING FOR PISTON RODS, PUMP RODS, AND VALVE SPINDLES," upon the con-
dition (amongst others) that I, the said John McLintock, my executors or
administrators, by an instrument in writing under my hand and seal, should
particularly describe and ascertain the nature of the said Invention, and in
what manner the same was to be performed, and cause the same to be filed in
the Great Seal Patent Office within six calendar months next and immediately
after the date of the said Letters Patent.
NOW KNOW YE, that I, the said John McLintock, do hereby declare
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement, reference being had to the accompanying Drawings, and to the
letters and figures marked thereon, that is to say:-
My said Invention consists essentially in constructing a light and durable
packing for the stuffing boxes of piston rods, pump rods, valve spindles, and
other parts of machinery requiring such packing of vulcanized india-rubber or
other suitable elastic material faced or lined with metal on the inner or rubbing
surface of the packing.

page_text: In carrying out my Invention I construct a split ring of vulcanized india-
rubber, combined or not with fibrous material, and adapt to the inner or rubbing
surface thereof a lining of sheet copper, brass, steel, or other suitable metal
which may be secured to the india-rubber ring by having tongues formed upon
the metal lining, and bending such tongues over the upper and under or upper
or under surfaces of the ring. In some cases, however, these tongues may
be dispensed with; the split or opening in the ring and metal lining is bevelled
or stepped so as to prevent the escape of steam or other fluid at the joint, or
two or more packing rings with a straight split may be superposed, and
so placed as to break joint with each other when in the stuffing box. This
compound packing ring or rings is or are introduced into the ordinary stuffing
box, and is or are compressed or tightened up as required by the usual gland
and tightening screws.
And in order that my said Invention may be fully understood I shall now
proceed more particularly to describe the same, and for that purpose shall
refer to the several Figures on the annexed Sheet of Drawings, the same
letters of reference indicating corresponding parts in all the Figures.
Figure 1 of the accompanying Drawings represents a plan, full size, of
a piston rod packing ring constructed according to my Invention; Figure 2
is a cross section of the same; and Figures 3 and 4 are elevations shewing
the different modes of forming the split or opening in the ring.
may
A represents the elastic material composing the body of the packing ring;
this
consist of vulcanized india-rubber or other suitable elastic material.
I have found that a ring composed of a strip of canvass impregnated with
india-rubber and coiled upon a mandril of the desired size answers well in
practise, but it is obvious that various materials and methods of manufacture
may be employed in making these elastic packing rings. Within the elastic
ring so formed I introduce a lining or facing of sheet copper, brass, steel, or
other suitable metal or alloy in the form of a split ring B, and in order to
secure or hold such metallic lining in its place I prefer to cut or indent one
or both its edges so as to form a number of sharp teeth or points, as shewn
at a, a, which I bend over and insert into the body of the elastic ring, as will
be readily understood on referring to the sectional elevation Figure 2. In
this Figure I have only represented the points a as being formed upon one
edge of the metal ring B and inserted into one face of the elastic ring A, but if
found desirable the metallic ring or lining may be similarily secured on both
its edges, or the points a may be dispensed with entirely. The slit or opening
in these packing rings may either be made straight down the ring, as in
Figure 2, or it may be stepped, as in Figure 3, or bevelled or scarfed, as in

page_text: Figure 4. When applying these packing rings it is simply requisite to open
the ring sufficiently to enable it to pass on to the rod or shaft to be packed,
and then to close the ring until it will enter the stuffing box.
In order to fill the cavity in the bottom of the stuffing box I interpose when
requisite a packing or washer of hemp or other like material between my
improved compound packing ring, and the bottom of the stuffing box, a
similar packing or washer being introduced between the end of the stuffing box
gland and the compound packing ring so as to fill up the entire cavity of the
stuffing box.
Having now described and particularly ascertained the nature of my said
Invention, and the manner in which the same is or may be used or carried into
effect, I would observe in conclusion that what I consider to be novel and original
and therefore claim as the Invention secured to me by the herein-before in part
recited Letters Patent is, the construction and application of compound packing
rings composed of india-rubber or other suitable elastic material faced or lined
with metal on the rubbing surface, substantially as and for the purposes
herein-before described.
In witness whereof, I, the said John, McLintock, have to this my
Specification set my hand and seal, the Twenty-third day of August,
One thousand eight hundred and sixty-seven.
JOHN MCLINTOCK. (L.S.)