Improvements in or Applicable to Pistons, Valves, Pump Buckets, and the like.
Year: 1886

page_text: Date of Application, 1st July, 1886.
Complete Left, 22nd Feb., 1887.
Complete Accepted, 22nd Mar., 1887.
PROVISIONAL SPECIFICATION.
Improvements in or Applicable to Pistons, Valves, Pump Buckets,
and the like.
We WILLIAM COOPER SPURR, of No. 71, Finsbury Pavement in the city of
London, Engineer, and HUBERT ELLIS SMITH, of 135, Keppel Street, in the county
of Middlesex, Mechanical Engineer, do hereby declare the nature of this invention to
be as follows:
This invention relates to improvements in elastic metallic packing rings for pistons,
valves, pump buckets and the like.
In carrying out our invention we employ one or more packing rings cut and
tongued in the usual manner.
The packing ring or rings are acted upon internally by a number of rollers carried
by an elastic ring, the action of which tends to press the rollers outwards against the
inner circumference of the packing ring or rings in order to maintain them in close
contact with the walls of the cylinder.
The amount of compression of the elastic ring and consequent thrust of the rollers
outwards can be varied by an adjustment in the elastic ring between it and the rollers
and we have found that à taper cotter or wedge can be advantageously used for this
purpose.
To avoid side play in the packing rings between the flanges of the piston head and
junk ring, we provide the packing rings with flanges which are acted upon by springs
fitted in the rollers. These springs force the rings apart and against the flat faces of
the piston head and junk ring.
We sometimes use iwo angular packing rings and cone the ends of the rollers,
which when forced outwards against the angular packing rings by the action of the
elastic ring exert both a lateral and circumferential thrust on the packing rings.
13
L
1007
G. F. REDFERN,
4, South Street, Finsbury, London,
Agent for the Applicants.

page_text: We WILLIAM COOPER SPURR, of No. 71 Finsbury Pavement, in the city of
London, Engineer and HUBERT ELLIS SMITH of 135 Keppel Street, in the county
of Middlesex, Mechanical 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 relates to improvements in elastic metallic packing rings for pistons,
valves, pump buckets and the like.
In carrying out our invention we employ one or more packing rings cut and
tongued in the usual manner.
The packing ring or rings is or are acted upon internally by a number of rollers
carried by an elastic ring, the action of which tends to press the rollers outwards
against the inner circumference of the packing ring or rings in order to maintain
them in close contact with the walls of the cylinder.
The amount of compression of the elastic ring and consequent thrust of the rollers
outwards can be varied by an adjustment in the elastic ring between it, and the rollers
and we have found that a taper cotter or wedge can be advantageously used for this
purpose.
To avoid side play in the packing rings between the flanges of the piston head and
junk ring we provide the packing rings with flanges which are acted upon by springs
fitted in the rollers. These springs force the rings apart and against the flat faces of
the piston head and junk ring.
We sometimes use two angular packing rings and cone the ends of the rollers,
which when forced outwards against the angular packing rings by the action of the
elastic ring exert both a lateral and vertical thrust on the packing rings.
In order to enable our invention to be fully understood we will describe how the
same can be carried into practice by the aid of the accompanying drawing in which
figure I represents an elevation half in section of a piston with our improvements
applied thereto, the packing rings being shewn provided with our spring rollers; the
section is taken on the line A B of figure 2 which is a plan of our elastic metallic
packing ring partly in section the section being taken just below the flange of the top
packing ring figure 3 is a section of part of our improved packing ring as it appears
when not placed in the piston; figures 4 and 5 are a horizontal section and an
elevation respectively of the packing or cod piece we sometimes employ between the

page_text: elastic ring and the rollers; figures 6 and 7 are plan views illustrating means for
adjusting the lateral pressure of the rollers; figure 8 is a similar view to figure 3 but
illustrating the angular packing rings and conical ended rollers which we sometimes
employ. Similar letters in all the figures represent similar parts.
Referring to figures 1 to 3 a, a, represent the packing rings and b, b, b, the rollers
which act upon the internal surface of such rings; c, c, d, d, represent our elastic
ring which carries the rollers b, b, and the action of which tends to press the rollers
outwards against the inner circumference of the packing rings a, a, in order to keep
the latter in close contact with the walls of the cylinder; the spring ring is advan-
tageously constructed (as shewn in figure 2) of a number of loops c, connected by
tempered steel springs d, d, which are rivetted thereto the whole forming a kind of
corrugated elastic or flexible ring but we do not confine ourselves to this method of
making the said rings which can obviously be constructed if required of a single piece
of spring metal; in the said figures we have shewn the loops e, e, provided with
packing or cod pieces e, e, (one of which is shewn in detached views at figures 4
and 5) placed between the said loops and the rollers b, b, by varying the thickness of
which packing the amount of compression of the elastic ring c, d, and consequent
thrust of the rollers b, outwards can be varied as wear takes place. The said adjust-
ment can however be effected by means of set screws working in the loops c, c
figure 6 is a detached view shewing one of the loops c, provided with such a set
screw, or the adjustment can be effected by providing each of the loops with a taper
cotter or wedge as illustrated at g, in figure 7 the said cotters or wedges having
holes h, h, to receive pins in order to secure the same the packing or cod pieces e, e,
not being then required.
i, i, figures 1, 2 and 3 represent the flanges with which we provide the packing
rings a, a, figures 1 and 3 shews one of the springs which we fit inside the
rollers b, b; the rollers being each formed of a hollow case k, in which works a plug /;
against the inner end of this plug the spring j, bears so as to always tend to force it
outwards and thereby force the rings a, a, apart and tight against the flat faces of the
piston head m, and junk ring n; by this means we avoid side play of the rings a, a,
between the flange of the piston head and the junk ring; o, is a stop in the case k, for
preventing the spring, from pressing the plug 1, out of the case when the packing
rings a, a, and rollers b, b, are taken out of the piston m, as will be clearly seen by
reference to figure 3 which illustrates the vertical action of the spring j, the packing
rings a, a, being shown moved apart to the fullest extent by the spring roller b.
In figure 8, p, p, are the angular or inclined surfaces of the packing rings a, a,
which we sometimes employ in combination with solid rollers d, having conically
shaped ends, the said rollers when forced outwards against the angular packing
rings a, a, by the action of the elastic ring exerting both a lateral and vertical thrust
on the packing rings a, a, so as to press the rings outwards against the walls of the
cylinder and apart against the flat faces of the piston head and the junk ring. Any
of the hereinbefore described means of adjustment can be used with this arrangement.
We have described and illustrated our invention as applied to a piston head by way
of example its application to valves, pump buckets and the like will be well
understood without further description.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed we declare that what we claim is :-
1. The application to the packing rings of pistons, valves, pump buckets and the
like, of rollers or blocks of metal fitted with springs and carried in loops or sockets in
an elastic ring or rings substantially as and for the purpose hereinbefore described
and illustrated in the accompanying drawing.
2. In packing rings for pistons, valves, pump buckets and the like the combination
with an elastic ring having loops or sockets, of rollers and cod packing pieces the
rollers being fitted with internal springs as and for the purpose hereinbefore described
and illustrated in figures 1 to 7 of the accompanying drawing.

page_text: 3. In packing rings for pistons, valves, pump buckets and the like, the use, in
combination with solid rollers having conical ends, of an elastic ring having loops or
sockets as and for the purpose herein before described and illustrated in figure 8 of the
accompanying drawing.
4. The means herein described and illustrated of adjusting our improved packing
rings to allow of compensating for wear.
5. The improved elastic metallic packing rings for pistons, valves, pump buckets,
and the like herein before described and illustrated in the various figures of the
accompanying drawing.
G. F. REDFERN,
4, South Street, Finsbury, London,
Agent for the Applicants.