Year: 1887

page_text: Date of Application, 26th Jan., 1887.
Complete Left, 18th Aug., 1887.
Complete Accepted, 23rd Sept., 1887.
1 ALEXANDER MAC LAINE of No. 1 Queens Elms, Belfast, in the County of Antrim,
Shipowner, do hereby declare the nature of this invention to be as follows:-
:-
I construct elastic metallic double expansion packing for steam and other pistons
with two packing rings each cut through transversely in one place and I expand said
packing rings in the direction of the axis of the cylinder, against the piston flange
and junk ring respectively, by means of a circular waved spring, or a series of waved
springs placed in a circle, by preference, in a recess formed all round between the
packing rings; and combined with arrangements as aforesaid, I expand said packing
rings outwards circumferentially against the inner surface of the cylinder by means
of a series of coil springs placed at intervals inside the packing rings between them
and the piston body, and I make each of said coil springs to extend across both
packing rings so that each coil spring acts upon both packing rings and presses both
rings together outwards against the inner surface of the cylinder-I by preference
fit the transverse cuts in the packing rings with ordinary tongue pieces I may fit
the coil springs aforesaid in recesses formed in the piston body, or in the packing
rings, or partly formed in each; and may construct the piston body between the coil
springs to extend close to the packing rings with a very small clearance so as to
obtain support from the piston body and prevent the rings being driven inwards by
the force of steam or water.
I may use more than two packing rings and may cut each packing ring transversely
through in more than one place.
I do not limit myself to the use of coil springs for outward expansion of the packing
rings as aforesaid, but may use gun-lock, coach, or other suitable springs for said
purpose; and I
may make the series of wave springs placed between the packing
rings as aforesaid, with two or more waves in each length and fitted with feet or stops
at the ends to prevent the ends slipping past each other.
Dated this Twenty fourth day of January 1887.

page_text: COMPLETE SPECIFICATION.
Improvements in Packing for Steam and other Pistons.
I ALEXANDER MAC LAINE of No. 1 Queens Elms, Belfast in the County of Antrim
Shipowner 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 :-
I construct elastic metallic double expansion packing for steam and other pistons
with two packing rings each cut through transversely in one place, and I expand said
packing rings in the direction of the axis of the cylinder, against the piston flange
and junk ring respectively, by means of a circular waved spring or a series of waved
springs placed in a circle (by preference) in a recess formed all round between the
packing rings; and combined with arrangements as aforesaid I expand said packing
rings outwards circumferentially against the inner surface of the cylinder by means
of a series of coil springs placed at intervals inside the packing rings between them
and the piston body, and I make each of said coil springs to extend across both
packing rings, so that each coil spring acts upon both packing rings and presses both
rings together outwards against the inner surface of the cylinder-I by preference
fit the transverse cuts in the packing rings with ordinary tongue pieces I may fit
the coil springs aforesaid in recesses formed in the piston body, or in the packing
rings, or partly formed in each, and may construct the piston body between the coil
springs to extend close to the packing rings with a very small clearance so as to
obtain support from the piston body and prevent the rings being driven inwards by
the force of steam or water.
I may use more than two packing rings and may cut each packing ring transversely
through in more than one place.
I do not limit myself to the use of coil springs for outward expansion of the packing
rings as aforesaid and may use gun lock, coach, or other suitable springs applied in
the manner and for the purposes as described, and I by preference make the series of
wave springs placed between the packing rings as aforesaid, with two or more waves in
each length and fitted with feet or stops at the ends to prevent the ends slipping past
each other.
And in order that my said Invention may be more fully understool I shall now
proceed to refer to the drawings upon the sheet hereunto annexed, the same letters
of reference indicating the same or corresponding parts throughout all the drawings,
in which
Fig. 1 is a sectional elevation of a steam piston showing among other things the
piston body, the junk ring and two packing rings with coil springs.
Fig. 2 is a sectional plan of a steam piston showing the piston body and a packing
ring with coil springs for outward expansion placed in recesses formed at intervals all
round in the piston body, and
Fig. 3 is a sectional elevation of the face of the packing rings showing a wave

page_text: spring placed in a recess between them for expansion in the direction of the axis of
the cylinder.
In all of which Figs. a is the piston body, 6 the junk ring, ce packing rings,
d wave spring recess, ee coil springs for outward expansion, ff ordinary brass
tongue pieces, 9g spaces left at side of springs to facilitate thoir removal when
required, and the wave spring placed in a recess between the packing rings.
Having now described my said Invention and in what manner the same is to be
performed, I declare that what I claim is
First The use in steam and other pistons of double expansion packing rings
arranged with a waved spring or waved springs between the rings combined with the
use of coil or other springs across both rings for simultaneous outward expansion
substantially as described and shown on the drawings hereunto annexed, and
Second The use in steam and other pistons of compound elastic metallic double
expansion packing substantially as described and shown upon the drawings hereunto
annexed.
Dated this Sixtoanth day of Anouck 1907