Improvements in or relating to Packings for Piston Rods, Valve Rods, or the like.
Year: 1894

page_text: PROVISIONAL SPECIFICATION.
Improvements in or relating to Packings for Piston Rods, Valve
Rods, or the like.
I, CHARLES JOHN MCEWEN of 72 Athol Street, Liverpool in the County of
Lancaster, Gas Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention has for its object a packing for piston rods, valve rods or the like,
applicable for preventing leakage of steam from a cylinder or steam chest of an
engine. It is designed to give an advantage in the reduction of friction, to preserve
the rod surface in perfect condition, enable the packing to be easily tightened, and
at the same time being very durable. Furthermore, it has the advantage that it
can be applied to existing cylinders.
In carrying my invention into effect, the plan I prefer is to provide an annular
shell or ring bored rather larger than the rod or spindle to which it is desired to
apply the packing. Inside this shell, I provide annular packing rings alternating
with a ring of brass or other suitable material of a double V or diamond section,
and the end rings pressing against glands of somewhat similar shape. The packing
rings may be split so as to expand or contract as required, or be formed solid, the
object being that these diamond shaped articles shall compress the packing rings
The annular recessed shell may
against the rod, and prevent the passage of steam.
if preferred be made in two halves, or in most cases I prefer to make it solid, and
outside this annular shell, I provide an outer annular shell formed with lateral cam
grooves, each of which receives stationary studs. By rotating this outer shell,
therefore, the studs acting in the cam grooves cause the annular shell to press
against the rings, thus compressing the packing rings, and squeezing then against
the rod.
This apparatus may be simply attached to the outside of an ordinary stuffing box
and cylinder, or if the cylinder is made specially to receive them, the ordinary
stuffing box is dispensed with altogether.
I have described one way of carrying my invention into effect, but it is obvious
that other means may be provided for pressing the packing rings against the rod
or spindle, thus in place of the outer annular shell with the cam grooves, I may
use a flange fitting on to the shell, and adapted to compress the rings by means of
studs, and nuts. Furthermore the peculiar formation or section of the rings and
glands may be applied to ordinary stuffing boxes.
Dated this 20th day of November 1894.
WM. P. THOMPSON & Co.,
Of 6 Lord Street, Liverpool, Patent Agents for the Applicant.

page_text: Improvements in or relating to Packings for Piston Rods, Valve
Rods, or the like.
I, CHARLES JOHN MCEWEN of 72 Athol Street, Liverpool in the County of
Lancaster, Gas 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 has for its object a packing for piston rods, valve rods or the like,
applicable for preventing leakage of steam, water, gas or air from a cylinder.or
chest. It is designed to give an advantage in the reduction of friction, to preserve
the rod surface in perfect condition, enable the packing to be easily tightened, and
at the same time be very durable. Furthermore, it has the advantage that it can
be applied to existing cylinders or chests.
In carrying my invention into effect, the plan I prefer is to provide an annular
shell or ring bored rather larger than the rod or spindle to which it is desired to
apply the packing. Inside this shell, I provide annular packing rings alternating
with a ring of brass or other suitable material of a double V or diamond section,
and the end rings pressing against glands of somewhat similar shape. The,packing
rings may be split so as to expand or contract as required and for convenience of
placing in position, or they may be formed solid, the object being that these
diamond shaped articles shall compress the packing rings against the rod, and
prevent the escape of steam, water, gas or air. The annular recessed shell may, if
preferred, be made in two halves, (but in most cases I prefer to make it solid) and
outside this annular shell, I provide a second annular shell formed with lateral cam
or screw grooves, each of which receives stationary.studs. By rotating this outer
shell, therefore, the studs acting in the cam or screw grooves cause the annular
shell to press against the rings, thus compressing the packing rings, and squeezing
them against the rod equally all round, thus avoiding the unequal screwing down
so common with ordinary glands.
This apparatus may be simply attached to the outside of an ordinary stuffing
box and cylinder or chest, or if the cylinder or other vessel be made specially
to receive then, the ordinary stuffing box is dispensed with altogether.
I have described one way of carrying my invention into effect, but it is obvious
that other means may be provided for pressing the packing rings against the rod
or spindle, thus in place of the outer annular shell with the cam or screw grooves,
I may use a flange fitting on to the shell, and adapted to compress the rings by
means of studs and nuts. Furthermore, the peculiar formation or section of the
rings and glands may be applied to ordinary stuffing boxes.
Referring to the drawings--
Figure 1 is a section,
Figure 2 plan, and
Figure 3 an elevation of one form of carrying my invention into effect.
Figure 4 elevation of outer ring with cam or screw grooves.
Figure 5 plan of same.
In these A is the shaft, B cylinder cover, C main gland, D gasket or other
packing, E inner seating, F F metallic packings, G double V ring, H inner gland,
I outer cylindrical piece having cam or screw grooves J, K lugs on the main glaud,
L studs on these lugs projecting into the cam or screw grooves, M subsidiary safety
locking studs not necessary in most cas00 as the studa L. act as locking studs when

page_text: 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 1
claim is
1. The improvement in packings for piston or valve rods or the like, which
consists in metallic packing rings alternating with ✓ surfaced rings or built up ring
pieces, substantially as described.
2. The combination of a gland having ordinary packing below and metallic or
other packing between it and the rod, and a second internal gland holding down
said packing, substantially as described.
3. The device for holding down and adjusting packing, consisting of a gland
having a spiral groove and studs or equivalent screw device and a clamping device
whereby by turning the gland round and clamping it, any vertical wear or slackness
in the packing can be taken up equally all around, thus avoiding the unequal screwing
down so common with ordinary glands.
Dated this 20th day of Anost 1005
W. P. THOMPSON & Co.,
Of Liverpool, Manchester, Birmingham, and London, Patent Agents.