Improvements in or applicable to Pistons and the like.
Year: 1893

page_text: Date of Application, 23rd Mar., 1893
Complete Specification Left. 6th Oct., 1893-Accepted, 11th Nov., 1893
PROVISIONAL SPECIFICATION.
Improvements in or applicable to Pistons and the like.
We, OSCAR CARR, and WILLIAM LOCKWOOD, both of City Standard Piston
Works, Bramall Lane, Sheffield, Engineers, do hereby declare the nature of the
said invention to be as follows:-
This invention relates to an improved combination of parts constituting the
guiding and steam-tight parts of piston blocks and the like.
According to the invention, we use in combination, two adjustable guiding rings
of angular section, conjunctively with an intermediate ring of flat section disposed
broadwise in relation to the open angles of the juxtaposed guiding rings on the
opposite sides thereof, and forming therewith annular recesses in which self-
expansive packing rings are placed.
Any wear in the guiding rings is compensated by setting out the rings by
inserting lining pieces between the meeting ends of such rings, securing the same
by bolts engaging with inner projecting lugs on such meeting ends.
The guiding rings are also made with inner projecting lugs adapted to fit against
the body of the piston block and provided with screw or other means of
adjustment enabling the rings to be properly centred in relation to the piston
block, upon such rings being set out to compensate for circumferential wear by the
insertion of radial lining pieces as aforesaid.
The primary purpose of the intermediate ring is to form a means of separation
between and an abutment for the adjacent edges of the guiding and the packing
rings, but it may also be used as an additional guiding ring and be cut across, in
which event it may be similarly adjusted and compensated for wear as mentioned
in relation to the outer guiding rings, or its meeting ends may be cast with end
recesses adapted to receive a coiled spring serving to separate the ends and
distend the circumference to compensate for wear, and in both such events the
angular rings would then not require to be fitted with lining pieces but the joints
of their meeting ends would be covered by tongue pieces.
If the intermediate guiding ring be distensible, it is cast with outer projecting
lugs adapted to fit against the inner sides of the angular rings so as to serve to
support the same and to distend the same when such intermediate guiding ring is
itself distended. In such case the angular rings would not be made with inner
projecting lugs.
Dated this 23rd day of March 1893.
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C., Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in or applicable to Pistons and the like.
We, OSCAR CARR, and WILLIAM LOCKWOOD, both of City Standard Piston
Works, Bramall Lane, Sheffield, Engineers, do hereby declare the nature of the
said 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 an improved combination of parts constituting the
guiding and steam-tight parts of piston-blocks and the like; the same being

page_text: designed to avoid the present necessity of springing the packing-rings over the
guiding-rings into peripheral recesses formed therein, which renders them liable to
be broken when being placed or removed, and prevents them from being readily
removed when required to be cleaned; and to provide a construction which will
enable such parts to be readily put together or taken apart without distending the
packing-rings as aforesaid.
The invention is illustrated on the accompanying drawings in which .
designed to avoid the present necessity of springing the packing-rings over the
guiding-rings into peripheral recesses formed therein, which renders them liable to
be broken when being placed or removed, and prevents them from being readily
removed when required to be cleaned; and to provide a construction which will
enable such parts to be readily put together or taken apart without distending the
packing-rings as aforesaid.
The invention is illustrated on the accompanying drawings,
Fig. 1, represents a plan view.
Fig. 2, represents a sectional elevation on the line a, b, Fig. 1.
Fig. 3, represents a like view on the line c, d, Fig. 1.
Fig. 4, represents a plan view.
Fig. 5, represents a sectional elevation on the line e, f, Fig. 4.
Fig. 6, represents a like view on the line g, h, Fig. 4.
Fig. 7, is a sectional elevation of a modification, and ;-
Fig. 8, is a perspective view.
Like reference numerals indicate like parts wherever they are repeated on the
drawings.
The invention consists in the use, in combination, of two adjustable guiding rings a,
each of angular section, conjunctively with an intermediate ring b. disposed flatwise
or broadwise in relation to the open angles of the guiding rings on its opposite sides
(vide Fig. 2) so as to form therewith annular peripheral recesses c.
This con-
struction enables the packing rings d, to be placed in the angles of the guiding
rings without being sprung over the full diameter of the outer periphery of such
rings, and of their being then located in position by the common ring b.
The primary purpose of the ring b, is to form a means of separation between and
an abutment for the adjacent edges of the guiding and the packing-rings, and it
may consist simply of a flat uncut ring (vide Figs. 2, 3 and 5) or it may be cut
across and used as an additional adjustable guiding ring, vide Figs. 6 and 7.
Such
In the former case, the guiding rings are made with inner projecting lugs e,
(vide Fig. 1,) adapted to fit against the body of the piston-block, represented by the
dotted line, and which are or may be adapted with radial screw or other means of
adjustment enabling such rings to be properly centred in relation to the piston-
block upon their being set out to compensate for any circumferential wear.
compensation may be effected either by inserting radially disposed lining pieces g,
(vide Figs. 4 and 5,) between the meeting ends of such rings and securing the same
by nuts and bolts h, engaging with inner projecting lugs i, cast on such meeting
ends; or, in lieu thereof, the meeting ends of such rings may be cast or formed
with recesses or pockets j, (vide Figs. 1, and 3,) adapted to receive a coiled spring k,
serving to separate such ends and distend the circumference of the rings to
compensate for wear, the joint between the meeting ends being covered by a
tongue-piece l.
In the latter case, the cut intermediate ring may also be similarly centred and
set out or adjusted and compensated for wear as herein before described in relation
to the angular guiding rings, or all such means of centreing and setting out the
angular guide rings may be dispensed with, the cut intermediate ring being cast
with projecting lugs m, (vide Figs. 4 and 6,) adapted to fit against the inner sides of
the angular guiding rings so as to serve to support and to distend the same when
such cut ring is itself distended by such means as aforesaid, the meeting ends of all
such rings being closed by tongue-pieces 7, if the ring b, be let out by a spring k.
In this case also, the ring b, may be lipped on both sides or lipped on one side and
recessed on the other as at n, (vide Fig. 7,) so as to be adapted to engage with the
rings a, and partake equally therewith of all distensive adjustments thereof.
The packing rings d, are preferably made of a solid self-expansive formation
adapted to fit said recesses c, vide Figs. 2, and 3, the meeting ends of such rings
being formed as represented in Figs. 7, and 8, but any other suitable packing rings
may be applied and used.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:-
1. In combination, in a piston-block or the like, two adjustable guiding-rings
each of angular section, and an intermediate ring disposed flatwise or broadwise in
relation to the open angles of the guiding rings on its opposite sides, so as to form
therewith annular peripheral recesses for the packing rings, the parts being so
constructed and combined as to allow of their separation so that the packing rings
can be inserted in the laterally open angular recesses of the guiding rings without
being sprung over the full diameter thereof and of their being juxtaposed so as to
locate such packing rings in position for use, substantially as hereinbefore
described.
2. The several modifications hereinbefore described in which the intermediate
ring is uncut.
3. The several modifications hereinbefore described in which the intermediate
ring is cut and adjustable.
Dated this 29th day of September 1893.
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C., Agents for the Applicants.