Improvements in Metallic Packing for Piston Rods, Valve Spindles, and other like Purposes.
Year: 1888

page_text: Date o Application, 26th May, 1888
Complete Specification Left, 7th Mar., 1889
Complete Specification Accepted, 13th Apr., 18
PROVISIONAL SPECIFICATION.
Improvements in Metallic Packing for Piston Rods, Valve Spindles,
and other like Purposes.
I NICHOLAS SWANSON HAWKS, of Atherton Road, Forest Gate, in the County
of Essex, Engineer do hereby declare the nature of this invention to be as follows:-
My invention has reference to metallic packing for piston rods, valve spindles,
and other like purposes and consists in a particular arrangement of packing rings
and in allowing the steam or motive fluid to act directly upon the inner face of the
innermost ring.
In carrying out my invention I place around the piston rod, valve spindle or other
part to be packed a ring or sleeve with tapered or bevelled faces, that is to say, the
inner edges of the ring which are next the rod or spindle extend beyond the outer
edges; this ring, which for distinction I will call the intermediate ring is prefer-
ably divided transversely. Around this intermediate ring I fit another ring with
tapers or bevels which form continuations of the tapers or bevels of the intermediate
ring. Above or beyond these rings is another ring correspondingly tapered or
bevelled but in the opposite direction so as to fit them; this other ring is at the
top or outer part of the stuffing box. Below the intermediate ring is another ring
at the inner part of the stuffing box; this ring is likewise correspondingly tapered
or bevelled in the opposite direction so as to fit. the intermediate ring.
steam or motive fluid is admitted to the inner face of this innermost ring and
there is a spring between this ring and the inner end of the stuffing box. The spring
and the fluid pressure acting against the flat face of the innermost ring forces the
intermediate ring or rings against the piston rod or valve spindle while the outermost
ring makes a steam tight joint against the top of the stuffing box and compression
plate.
Dated this acil 3
Mon 1000
The

page_text: and other like Purposes.
I, NICHOLAS SWANSON HAWKS of Atherton Road, Forest Gate in the County of
Essex, 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 :-
My invention has reference to metallic packing for piston rods, valve spindles
and other like purposes, and consists in a particular arrangement of packing rings
and in allowing the steam or motive fluid to act directly upon the inner face of
the innermost ring.
In carrying out my invention I place round the piston rod, valve spindle, or
other part to be packed a ring or sleeve with tapered or bevelled faces, that is to
_ say, the inner edges of the ring which are next the rod or spindle oxtend beyond the
outer edges; this ring, which for distinction I will call the intermediate ring,-is-
preferably divided transversely. Around this intermediate ring 1 fit another ring
with tapers or bevels which form continuations of the tapers or bevels of the
intermediate ring. Above or beyond these rings is another ring correspondingly
tapered or bevelled, but in the opposite direction so as to fit them; this other ring is
at the top or outer part of the stuffing box. Below the intermediate ring is another
ring at the inner part of the stuffing box; this ring is likewise correspondingly
tapered or bevelled in the opposite direction so as to fit the intermediate ring. There
is a spring between this ring and the inner end of the stuffing box. The spring
and the fluid pressure (the steam or motive fluid entering the stuffing box at the
bottom) acting against the flat face of the innermost ring forces the intermediate
ring or rings against the piston rod or valve spindle, while the outermost ring
makes a steam tight joint against the top of the stuffing box and compression plate.
My invention will be understood by the annexed drawing which represents in
vertical section a stuffing box for a piston rod provided with metallic packing
constructed according to my invention. a is the piston rod. the stuffing box. c the
compression plate. d the stuffing box cover fixed by means of the screws e. is the
ring or sleeve which I have hereinbefore called the intermediate ring. It has tapered
or bevelled faces as shown and is preferably divided transversely as seen at g. h is the
second intermediate ring which is fitted around the ring fand has bevelled or tapered
faces which form continuations of the bevels or tapers of the ring f. The figure
shows these two rings fand partly in elevation. "When these rings are to be used
for packing a rod which is open ended, that is to say when they can be slipped over the
end of the rod, I prefer to make each ring in one piece with a longitudinal cut
through it; in other cases the rings are made in halves or segments. i is a ring
above or beyond these rings and correspondingly tapered or bevelled, but in the opposite
direction to fit them. This ring bears against the compression plate c. Below the
rings and h is another ring k likewise correspondingly tapered or bevelled in

page_text: the opposite direction to fit them. The rings i and do not fit the rod a, neither do
they fit the stuffing box. On the contrary there is a considerable space between them
and the sides or wall of the stuffing box, and the box is filled with the steam or motive
fluid which enters at the bottom of the stuffing box. Between the ring k and the
main end of the stuffing box is a strong spring 1. This spring and the fluid pressure
acting against the under face of the ring & force the ring fagainst the rod a and also
force the ring against the compression plate c thereby making a steam-tight joint
at the top of the stuffing box.
I am aware that for the purpose of packing piston rods, valve spindles or other like
parts it is not new to employ upon the rod or spindle a divided ring with tapered or
bevelled ends and correspondingly tapered or bevelled rings bearing against the ends
of the said divided ring, and I make no general claim thereto.
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
The combination of parts hereinbefore described and represented in the annexed
drawings forming an improved metallic packing for stuffing boxes, valve spindles,
and other like purposes.
Dated this 7th day of March 1889.
J. C. MEWBURN,
55 & 56, Chancery Lane, London,
Patent Agent.