Improvements in Metallic Packing for the Pistons of Steam Engine or other Cylinders, Piston Valves, or the like.
Year: 1892

page_text: Date of Application, 12th Apr., 1892
Complete Specification Left, 12th Jan., 1893-Accepted, 18th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in Metallic Packing for the Pistons of Steam Engine
or other Cylinders, Piston Valves, or the like.
We,
JOHN COOPER, of 72 Nottingham Street, Sheffield in the County of York,
Pattern Maker, and THOMAS PATTINSON, of Love Street, Sheffield, aforesaid,
Engineer, do hereby declare the nature of this invention to be as follows:-
The invention relates to metallic packing for the pistons of steam engine or other
cylinders, piston valves or the like which is used in each case for the purpose of
keeping tight the joint between the piston and the cylinder in which it moves.
Our invention consists essentially in the combination with the two metallic packing
rings frequently used having each a flange at one end of a second ring or a ring
cut into a number of suitable lengths-80 formed that one of its surfaces rests upon
a circular, elliptical, or other form of spring whilst the other has sliding contact
with the flange on the packing ring.
In carrying out our invention we at present prefer to employ two packing rings
constructed in the usual way, that is to say, each ring is provided with a flange
the underside of which is incliued so that when the two are placed together in their
proper position, a section is formed somewhat similar to a section of channel iron.
In combination with each flange we use a second ring or a ring cut into a number
of suitable lengths. This ring is formed with one surface to correspond to the
inclined underside of the flange whilst the other is hollowed out to the outer
contour of the particular spring-circular or elliptical-desired to be used for
forcing the parts outwardly in the usual manner. It will thus be understood that
the packing consists of two outer rings; two inner rings or portions of rings and
a circular or elliptical spring.
The advantages of a packing constructed as above are that the springs and outer
rings are not worn and caused to lock one another as in some packings at present
in use, but on the other hand, by the use of the inner rings as described the
latter slide on the outer rings and accomodate themselves to the varying
conditions.
Instead of using the ordinary outer rings with one flange we may form them
with an additional flange, and either use the inner rings and circular or elliptical
springs above described, or dispense with the inner rings and employ only a spring
such as described in our Specification 14741 of 1890.
Dated this 0th day of Anril 1809
Per pro EMMOTT & CO., LIMITED,
Robert Wood, Secretary,
New Bridge Street, Manchester, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Metallic Packing for the Pistons of Steam Engine
or other Cylinders, Piston Valves, or the like.
We, JOHN COOPER of 72, Nottingham Street, Sheffield, in the County of York,
Pattern Maker and THOMAS PATTINSON of Love Street, Sheffield, aforesaid,
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 :-
The invention relates to metallic packing for the pistons of steam engine or other
cylinders piston valves or the like which is used for the purpose of keeping tight
the joints between the piston and the cylinder in which it moves.

page_text: Our invention consists essentially in the combination with the two metallic
packing rings usually used, having each a flange at one end, of a second ring-or
a ring cut into a number of suitable segments-so formed that one of its surfaces
rests upon a circular or elliptical spring whilst the other has sliding contact with
the flange on the packing ring.
ID order that our invention may be readily understood we have appended hereunto
a sheet of explanatory drawings in which;
Fig. 1 is an elevation partly in section shewing a piston fitted with our improved
metallic packing.
Fig. 2, plan of Fig. 1.
Fig. 3 enlarged view in section of the rings and spring.
Fig. 4 similar view showing a modification, and
Fig. 5 enlarged section showing another modification.
In carrying out our invention and referring more particularly to Figs. 1 to 3
which show an ordinary piston fitted with our improvements we employ two packing
rings A constructed in the ordinary way. That is to say each ring is provided
with a flange a the underside of which is inclined so that when the two rings
are placed together in their proper position in the body of the piston a section is
formed somewhat similar to a section of channel iron. The outside of each flange
is parallel to the body of the piston the whole fitting therein in the ordinary way.
In combination with each flange we use a second ring B which we will hereinafter
refer to as a saddle ring. This saddle ring which may be split at one point only
or cut into two or more parts as desired as at bis formed with one surface b¹ to
correspond to the inclined side of the flange on the ring A whilst the other is
hollowed out at 61 to the outer contour, or nearly so, of the particular kind
of spring C-circular ellipticall oval or other shape-desired to be used for forcing
the parts outwardly in the manner well-known. It will therefore be seen that the
packing consists of two outer rings, two inner rings or portions of rings and a
circular, elliptical or other shaped spring.
Metallic packing constructed as above described has the advantage that the
outer rings and springs are not worn and caused to lock one with the other as
is the case with some packing at present in use but on the other hand by the use
of the inner rings as described the latter slide on the outer rings and accomodate
themselves to the varying conditions.
In some cases to facilitate the placing of the parts together we turn the packing
rings A each with a small lip or Hange a' as shown in Fig. 4 at the underside of
the flanges a leaving room however for the saddle rings B to have a little play so
as to enable it to slide freely.
Instead of using the ordinary outer rings with one flange we sometimes prefer
to form them with an additional flange D. and in this case we may either use the
inner saddle rings B and circular, oval or elliptical springs C above referred to or
dispense with the inner saddle rings and employ only in combination with them a
spring such as described in the Specification of our Patent No. 14,741 of 1890.
The arrangement just described and shown in Fig. 5 we prefer to use where the
packing rings A are very deep since by it the line of pressure through the spring
and flanges D is such that the outer faces of the packing rings A can be kept
parallel to the wall of the cylinder in which they move.
In all other respects the piston is constructed in the ordinary manner.
. Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. In metallic packing for the pistons of steam engine or other cylinders, piston
valves or the like the combination with outer packing rings and spring of saddle
rings, or portions of rings constructed substantially as and for the purpose
described.
2. In metallic packing such as referred to in Claim 1 the combination of packing

page_text: rings A, saddle rings B and circular, elliptical, oval or other shaped spring C
substantially as described.
3. Metallic packing for the purposes referred to constructed and arranged
substantially as described and shown with reference to Figs. 12 and 3; or with
reference to Fig. 4.
4. In metallic packing for the purpose referred to the combination with springs
such as hereinbefore described of double flanged packing rings with or without
saddle rings substantially as described.
5. In metallic packing for the purpose referred to the combination with springs
such as described in Specification No. 14,741 of the year 1890 of double flanged
packing rings substantially as described.
Dated this 11th day of January 1802
Per pro EMMOTT & Co., LIMITED,
Robert Wood, Secretary,
2, New Bridge Street, Manchester, and 391, Strand, London,
Agents for the Applicants.