Improvements in Metallic Packing for Piston and like Rods.
Year: 1899

page_text: Date of Application, 7th Nov., 1899-Accepted, 9th Dec., 1899
PROVISIONAL SPECIFICATION
Improvements in Metallic Packing for Piston and like Rods.
I, ADAM WARREN FRANCE, of 6512, State Street, Tacony, Philadelphia, Penn-
sylvania, United States of America, Manufacturer, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be particu-
larly described and ascertained in and by the following statement:-
This invention relates to an improvement in a packing for a piston or valve
rod and consists of the structural features hereinafter fully described and claimed.
Referring to the accompanying drawings,
Figure 1 represents a longitudinal section of a piston rod embodying my
invention.
Figure 2 represents a side elevation of one of the rings of the packing con-
structed in accordance with my invention.
Similar letters of reference indicate corresponding parts, in the figures.
a designates a packing ring consisting of three or more sections and in the
present case of three sections b, c, d.
e designates a piston rod around which said sections are situated and in contact
with which they are held, for instance, by a spring f situated within the circuni-
ferential groove 7 in the outer periphery of said sections of the packing ring.
The inner peripheries of said sections are of the same radii and their combined
length is less than the circumference of a circle of such radius, so that said
sections can be compressed to conform to the rod which they pack when a portion
or portions of said roll of less diameter than normal passes through the packing
ring, it being understood of course that said sections can likewise expand to con-
form to a portion of the rod whose diameter is greater than normal..
These sections b, c, d, have abutting faces upon which the adjacent sections
slide relatively and which form steam joints, each section having an outer abutting
face and an inner abutting face k. These abutting faces are tangential to the
inner peripheries of the sections, but do not necessarily intersect the saune, and in
the instance illustrated, shoulders and m are situated between the inner ends of
said abutting faces j and k and said inner peripheries. The abutting faces of each
section are at an angle to each other, and the angles of the different sections
correspond, so that the steam joints between these abutting faces are maintained
when the sections move relatively to conform to the inequalities in the rod pass-
ug therethrough. For instance, if the uneveness of the rod e causes the section b
to move outwardly, its outer face j sliding upon the inner face k of section d.
would tend to separate the inner face of said section from the outer face j of
section c. This is resisted however by the movement of section e upon its inner
face and the outer face ; of section d, whereby the outer face ; of section c
follows the inner face of section 6 to maintain the steam joint. It is under-
stood that the corresponding angles of the abutting faces of different sections
maintain the parallelism of such abutting faces that have a tendency to separate,
s in the case of the faces j and of sections b and c above described. The com-
pression of the sections in regaining their normal position, or in being compressed

page_text: from normal to accommodate a reduction in the diameter of the rod, being the
reverse of the expanding movement above described, is plainly obvious.
It is seen that I have produced a sectional packing ring in which the steam
joints between the abutting faces of adjacent sections are maintained under all
conditions and that the combined lengths of the inner peripheries of the sections
being less than the circumference of a circle of the saine radius as the inner peri-
pheries, the packing ring can be compressed as well as expanded from its normal
position.
I am aware that it has been proposed to construct a sectional packing ring of
two sections having tangential parallel abutting faces. In this device however,
there is no correlative movement between the different sections of the ring, so that
it is possible for one section to move away from the other section to break the
steam joints formed by the abutting faces, the same being due to the absence of
correlative movement between the sections, and the fact that the two sections can
only move in the same path when their abutting faces are in contact so that when
one section moves away from the other, the latter cannot follow. In my device
the sections move in relative angular paths, so that when section 6 is moving in
the path of its face j, section c moves on the path of its face k, and thus the
movement of one of my sections causes a corresponding change of relation or cor-
relative movement of all the sections which results in a maintainance of the
steam joints formed by the abutting faces.
In Figure 1, of the drawing, I have shown a piston rod packing by which the
rings can be readily applied to stuffing boxes of ordinary construction and which
consists of a sectional case n having a plurality of interior grooves pin which
the packing rings are situated in the usual manner adjacent packing rings being
doweled to break joints.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
--
1st. A packing ring consisting of three or more relatively movable compressible
sections, each section having inner and outer abutting faces forming steam joints,
snid faces extending at an angle to each other.
2nd. A packing ring consisting of three or more relatively movable compressible
sections, each section having inner and outer abutting faces forming aleam joints,
said faces extending at an angle to each other, and means for holding said sections
in contact under tension.
3rd. A packing ring consisting of three or more relatively movable compressible
sections, each section having inner and outer abutting faces forming steam joints,
said faces extending at an angle to each other, the inner periphery of said sections
heing of the same radii and the combined length of said inner peripheries
being less than the circumference of a circle of said radius.
D. WIL 1
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.