Improvements in and relating to Packing for Piston Rods and the like.
Year: 1893

page_text: Date of Application, 9th May, 1893
Complete Specification Left, 9th Feb., 1894-Accepted, 9th June, 1894
PROVISIONAL SPECIFICATION.
Improvements in and relating to Packing for Piston Rods and
the like.
I, TREVOR KEENE, of 16 Ravenscroft Road, Birkenhead in the County
of Chester, Engineer, do hereby declare the nature of this invention to be as
follows:
This invention relates to metallic packing for piston rods and the like, and the
object is to provide a cheap and effective packing, which, while permitting a
transverse vibration of the rod due to want of alignement between the crosshead
guides and the cylinder, will tend to support the weight of the piston so as to
prevent undue wear of the cylinder.
The packing proper is carried in a main sleeve having a larger internal diameter
than the diameter of the rod to be packed, and a smaller external diameter than
the stuffing box in which it is located. The opposite ends of the sleeve are provided
with flanges projecting internally, the outer end surfaces of which are spherical
and are struck from the same centre and are therefore concentric.
The spherical surface on the inner end of the sleeve bears upon a corresponding
couvex spherical surface formed on the face of a washer fitting in the bottom of
the stuffing box, and the spherical surface on the outer end bears on a corresponding
concave spherical surface formed on an outer gland carried by the usual gland
studs or on an inner gland adjustable relatively to the outer gland.
The main sleeve is divided transversely at or about the middle of its length into
two parts and in each part I provide a series of white-metal rings which occupy
the space between the rod and the sleeve for a portion of the length of the latter.
The rings of white-metal are cut so that they can be closed upon the rod and are
kept in position by two brass or gun-metal rings interposed between the two
extreme rings and the internal flanges on the main sleeve, and by two brass or
gun-metal rings of "L" section, separated by a compressed spiral spring, which
are interposed between the adjacent central white-metal rings. The white-metal
rings and the brass or gun metal rings have their adjacent surfaces suitably bevelled
so that the pressure due to the compressed spiral spring tends to force certain of
the white-metal rings into close contact with the rod, and it will also be seen that
since the pressure of the said spring is transmitted through the white-metal rings
to the flanges of the main sleeve, the spring tends to produce a uniform pressure
between the concentric spherical surfaces of the latter and their seatings; and
as the centre of the concentric spheres is made to coincide with the position of the
piston when the deviation of the crosshead is a maximum it will be seen, that while
the packing admits of transverse vibration, it tends to support the piston so as to
prevent undue wear.
When the piston rod to be packed has swelled ends the rings fitting on the rod,
have, of course, to be split but I make the internal flanges of the main sleeve
sufficiently large to pass over the swelled portion; the interposed spring in such
cases may also be so constructed as to admit of longitudinal division into two or
nore parts.
1
1000

page_text: COMPLETE SPECIFICATION.
Improvements in and relating to Packing for Piston Rods and
the like.
I, TREVOR KEENE, formerly of 16 Ravenscroft Road, Birkenhead but now of
42 Whetstone Lane, Birkenhead in the County of Chester, 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, which is an improvement on my invention described in Specifi-
cation to Letters Patent No. 21768 dated 29th November 1892, relates to metallic
packing for piston rods and the like, and the object is to provide a cheap and
effective packing which, while permitting a transverse vibration of the rod due to
want of alignement between the cross-head guides and the cylinder, will tend to
support the weight of the piston so as to prevent undue wear of the cylinder.
In the accompanying drawings which illustrate my invention Fig. I is a sectional
elevation on the line A. A. of Fig. II and Fig. II is an end elevation the upper
half being in section on the line B. B. of Fig. I.
Throughout the drawings, similar parts are indicated by the same reference
figures, and in the case of sections, the direction in which they are viewed is
indicated by the small arrows placed adjacent to the letters denoting the plane of
section.
The packing proper is carried in a main sleeve 1, 11 having a larger internal
diameter than the diameter of the rod 2 to be packed, and a smaller external
diameter than the stuffing box 3 in which it is located. The opposite ends of the
sleeve are provided with flanges 4 and 5 projecting internally, the outer end
surfaces of which are spherical and are struck as shown by the dotted lines, from
the same centre and are therefore concentric, as described in my prior Specification
aforesaid.
The spherical surface on the inner end of the sleeve bears upon a corresponding
convex spherical surface formed on the face of a washer 6 fitting in the bottom of
the stuffing box and the spherical surface on the outer end bears on a corresponding
concave spherical surface formed on the outer gland 7 carried by the usual gland
studs or it may be carried on an inner gland adjustable relatively to the outer
gland.
The main sleeve is divided transversely at or about the middle of its length into
two parts 1 and 1'. and in each part I provide a series of white-metal rings 8 which
occupy the space between the rod and the sleeve for a portion of the length of the
latter. The rings of white-metal are cut so that they can he closed upon the rod
and are kept in position by two brass or gun-metal rings 9 and 10 interposed between
the two extreme rings and the internal flanges 4 and 5 on the main sleeve, and by
two brass or gun-metal rings 11 and 12 of "L" section, separated by a compressed
spiral spring 13, which are interposed between the adjacent central white-metal
rings. The white-metal rings and the brass or gun-metal rings have their adjacent
surfaces suitably bevelled as shown so that the pressure due to the compressed
spiral spring 13 tends to force certain of the white-metal rings into close contact
with the rod, and it will also be seen that since the pressure of the said spring is
transmitted through the white-metal rings to the flanges 4 and 5 of the main sleeve,
the spring tends to produce a uniform pressure between the concentric spherical
surfaces of the latter and their seatings; and as the centre of the concentric
spheres is made to coincide with the position of the piston when the deviation of
the crosshead is a maximum it will be seen, that while the packing admits of
transverse vibration and has considerable flexibility, it tends to support the piston
so as to prevent undue wear.

page_text: When the piston rod to be packed has swelled ends, the rings fitting on the rod,..
have, of course, to be split but I make the internal flanges 4 and 5 of the main
sleeve sufficiently large to pass over the swelled portion; the interposed spring 13.
in such cases may also be so constructed as to admit of longitudinal division into
two or more parts.
It is to be understood that I make no claim herein broadly to the use of concentric
spherical bearing surfaces to locate the packing as this feature forms part of mý
prior invention aforesaid.
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 :-
1. In metallic packing, in combination, the divided main sleeve having concentric
spherical end bearing surfaces, the packing rings carried therein and the interposed
spring, substantially as and for the purpose described.
2. In metallic packing, in combination, the divided main sleeve 1, 1' having
concentric spherical end bearing surfaces located by the washer 6 and outer gland 7,.
the packing rings 8, the rings 9 and 10, the L sleeves 11 and 12 and the interposed
spring 13, substantially as described and illustrated.
3. In metallic packings, a divided main sleeve 1, 1' adapted to hold the packing
rings and having concentric spherical end bearing surfaces and internal flanges
which locate the packing rings endwise, said flanges having an internal diameter
sufficiently large to pass over the swelled end of the rod, substantially as described
and illustrated.
4. The combination and arrangement of parts forming the improved metallio
packing substantially as described and illustrated in Figs. I and II.
DL: Oh 1...
1001
SLOAN & LLOYD BARNES,
Castle Chambers, 26, Castle Street, Liverpool, Agents for the Applicant.