Improvements in Metallic Packing for Piston Rods, Valve Rods, or the like.
Year: 1893

page_text: Date of Application, 14th Nov., 1893.
Complete Specification Left, 7th June, 1894-Accepted, 4th Aug., 1894
PROVISIONAL
Improvements in Metallic Packing for Piston Rods, Valve Rods,
or the like.
I, RICHARD JEROME PARIS, of 1 India Buildings Liverpool in the County
of Lancaster, Engineer do hereby declare the nature of this invention to be as
follows
This invention has for its object a metallic 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 reduction of friction, to
preserve the rod surface in perfect condition, at the same time being very durable
and possessing the requisite degree of elasticity.
In carrying my invention into effect, the plan I prefer is to provide an annular
sheil or ring, bored to the same diameter or preferably a little larger than the rod
or spindle to which it is desired to apply the packing. On the inside face,
circumferential grooves or recesses are formed at suitable distances apart made to
receive the annular packing rings. In average cases, five rings are employed
of phosphor bronze or other suitable material, the inner ones being either split at
one part so as to expand or contract as required, or they are formed in two or more
sections and preferably arranged so as to break joint. These inner rings are
preferably triangular in cross section. The adjacent edges of two of the rings are
arranged to touch each other, while the third which is in cross section, like an
inverted triangle, is placed between them and is provided with a spiral or other
suitable spring or springs to give the requisite degree of elasticity and to press the
The outer annular
two other rings aforesaid against the surface of the rod.
packing rings are preferably solid and are adapted to be received by the
circumferential grooves in the inner face of the shell. They are adapted to fit
closely in these circumferential grooves so as to prevent steam passing to the back
of the rings, and thereby prevent them being pressed inwards with undue force
upon the rod by the abnormal pressure of the steam. I generally prefer to make
the annular recessed shell in two halves in order that the rings may be easily
inserted or removed. The two parts may be fastened together in any convenient
manner as by pins or dowels. This shell is made so that it can be received by the
stuffing box and is held fast in position by the gland. A suitable amount of
clearance may be left between the rings and the bottom of the circumferential
grooves in order to provide a certain amount of play or lateral movement for the
rod.
1000
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Metallic Packing for Piston Rods, Valve Rods,
or the like.
I, RICHARD JEROME PARIS, of 1 India Buildings, Liverpool in the County of
Lancaster, 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 metallic packing for piston rods, valve rods or

page_text: -
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 reduction of friction, to
preserve the rod surface in perfect condition, at the same time being very durable
and possessing the requisite degree of elasticity.
The invention will be best understood from the following description, reference
being had to the accompanying drawings and to the letters and numerals marked
thereon, in which
Figure 1 is a longitudinal section of the packing and shell;
Figure 2 a cross section on the line a b Figure 1;
Figure 3 an end elevation of the inner rings; and
Figure 4 a cross section.
In these figures, A is an annular shell or ring, bored to the same diameter or
preferably a little larger than the rod or spindle B to which it is desired to apply
the packing. On the inside face, circumferential grooves or recesses are formed at
suitable distances apart made to receive annular packing rings. In average cases,
five rings are employed of phosphor bronze or other suitable material, the inner
ones being preferably triangular in cross section and either split at one part so as
to expand or contract as required, or they are formed in two or more sections and
preferably arranged so as to break joint. These inner rings are shown in
Figs. 3 and 4 divided into six sections each section C overlapping the other in a
well known manner and clearly shown in Fig. 4. Care spaces. The adjacent
edges of two of the rings C are arranged to touch each other, while the third C¹
which in cross section is like an inverted triangle, is placed between them. The
outer annular packing rings C2 are preferably solid and are adapted to be received
by the circumferential grooves in the inner face of the shell A. They are adapted
to fit closely in these circumferential grooves so as to prevent steam passing to the
back of the rings, and thereby prevent them being pressed inwards with undue
force upon the rod B by the abnormal pressure of the steam. The ring C
is provided with a spiral or other suitable spring or springs D to give
the requisite degree of elasticity and to press the rings C radially against the
rod B and laterally against the rings C. I generally prefer to make the
annular recessed shell A in two halves in order that the rings may be easily
inserted or removed. The two parts may be fastened together in any convenient
manner as by pins or dowels E. This shell is made so that it can be received
by the stuffing box and is held fast in position by the gland. . A suitable amount of
clearance may be left between the rings and the bottom of the circumferential
grooves in order to provide a certain amount of play or lateral movement for
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. A metallic packing for the stuffing boxes of piston rods, valve rods or the
like, in which there are springy or flexible split or sectional rings C, initially of
the same diameter or slightly smaller than the rod, solid retaining rings C
adapted to fit closely in circumferential grooves in the shell A, and an intermediate
ring C' and spring D adapted to give the requisite degree of elasticity and press
the packing rings C laterally against the rings C2 and radially against the rod
substantially as described.
2. The general construction and arrangement of parts forming my improved rod
and spindle packing substantially as described.
Dated this 5th day of June 1894.
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Birmingham, Nottingham, and London,
Patent Agents.