IMPROVEMENTS IN PISTON PACKING RINGS to be as follows:
Year: 1884

page_text: We JAMES WHITEHEAD and JOHN POLLOCK both of 79 Limestone Road Belfast,
in the county of Antrim, Ireland, Engineers, do hereby declare the nature of our
said Invention for "IMPROVEMENTS IN PISTON PACKING RINGS to be as follows:-
"
This Invention consists of improvements in spring packing rings for pistons.
The improved packing, which is used in combination with the usual L shaped
rings, consists of a single helical spring or of a series of helical springs fitted in
sections, round the periphery of the piston within the L shaped rings.
The ends of the spring or springs are fitted with metallic blocks which are
beveled on the outer ends and so placed that an inclined joint is formed between
each pair of blocks. The beveled end of one block of each pair is formed with a
tongue or feather and the other with a corresponding groove, or one is formed with
a V shaped end which fits a V-like groove in the other, so that the ends when
fitted together may not be displaced.
The springs are of such length that when fitted in place in the piston the beveled
edge of the upper block or blocks overlaps that of the lower block or blocks, and
when the upper L shaped ring is fitted in place, and the usual junk ring screwed
down the one block of each pair is forced to slide on the other and a considerable
degree of compression is applied to the spring or springs, the effect of which is to
tend to force outwards the L shaped rings against the inside of the cylinder in
which the piston is fitted, and also keeps the rings hard against the flanges of the
piston. The degree of pressure may be varied by varying the angle of the beveled
ends, and further regulation may be provided by fitting washers between the ends
of the springs and the beveled blocks.

page_text: We, JAMES WHITEHEAD and JOHN POLLOCK, both of 79 Limestone Road Belfast
in the County of Antrim, Ireland, Engineers, do hereby declare the nature of our
said Invention for "IMPROVEMENTS IN PISTON PACKING RINGS," and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
This invention consists of improvements in spring packing rings for pistons and
is illustrated in the accompanying Drawings in which Figure 1, is a vertical
section of a piston fitted with the improved packing ring, Figure 2 is a section
showing the packing ring in elevation, Figure 3 is a plan and Figure 4 is a section
to a larger scale.
The improved packing, which is used in combination with the usual shaped
rings, consists of a single helical spring or of a series of helical springs A fitted in
sections, round the periphery of the piston within the L shaped rings C.
The ends of the spring or springs A are fitted with metallic blocks B B¹ which
are beveled on the outer ends and so placed that an inclined joint b is formed
between each pair of blocks. The beveled end of one block of each pair is formed
with a tongue or feather and the other with a corresponding groove as shown in
Figure 3 and in dotted lines in Figure 4 or one is formed with a V shaped end
which fits a V like groove in the other, so that the ends when fitted together may
not be displaced.
The springs A are of such length that when fitted in place in the piston the
beveled edge of the upper block or blocks B overlaps that of the lower block or
blocks B' and when the upper L shaped ring C is fitted in place, and the usual junk
ring D screwed down the one block B or B₁ of each pair is forced to slide on the
other and a considerable degree of compression is applied to the spring or springs
the effect of which is to tend to force outwards the L shaped rings C against the
inside of the cylinder in which the piston is fitted, and also to keep the rings hard
against the flanges of the piston. The degree of pressure may be varied by varying
the angle of the beveled ends and further regulation may be provided by fitting
washers between the ends of the springs and the beveled blocks.
The rings C may also be connected by a tongue and groove as indicated at c in
Figures 1, 2 and 4.
Having now particularly described the nature of our said invention and in what
manner the same is to be performed we declare that what we claim is
1. In a piston packing ring, a helical spring or springs fitted with beveled blocks
as and for the purpose set forth.
2. In combination with the piston rings C, the spring or springs A and the
beveled blocks B, B' as and for the purpose set forth.
Dated thin 7th dow of Anvil 190K