Year: 1886

page_text: I, HENRY JACK of the Canal Basin Foundry, Port Dundas, Glasgow, in the
County of Lanark, North Britain, Engineer do hereby declare the nature of this
invention to be as follows:-
This invention, which relates to an improvement in piston packing, has for its
object to ensure that the packing rings shall at all times properly bear against the
interior of the cylinder as well as against the flanges of the piston in which the
packing is contained or held.
The inner side of the two packing rings is formed with a deep V-groove therein
into which a correspondingly shaped elastic ring preferably of steel presses so that
the packing rings are forced by the elasticity of the said ring both outwards
against the cylinder and apart against the flanges of the piston simultaneously.
The aforesaid elastic spring ring may be made in one piece or in sections of two,
three, four or more in number and one or more spiral or equivalent springs are
used for the purpose of forcing the elastic ring with a sufficient degree of pressure
against the interior of the packing rings.
J. H. JOHNSON, DAY & JOHNSON,
Petitioner's Agents,
115, St. Vincent Street, Glasgow.

page_text: I, HENRY JACK of the Canal Basin Foundry, Port Dundas, Glasgow, in the
County of Lanark, North Britain, Engineer do hereby declare the nature of my
invention for AN IMPROVEMENT IN PISTON PACKING and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement :-
My Invention, which relates to an improvement in piston packing, has for its
object to ensure that the packing rings shall at all times properly bear against the
interior of the cylinder as well as against the flanges of the piston in which the
packing is contained or held.
The inner side of the two packing rings is formed with a deep V-groove therein
into which a correspondingly shaped elastic ring preferably of steel presses so that
the packing rings are forced by the elasticity of the said ring combined with the
elastic force of the spiral spring both outwards against the cylinder and a part
against the flanges of the piston simultaneously.
In order that my Invention may be properly understood and readily carried
into effect, I will now proceed to describe the drawings hereunto annexed.
Figure 1, of the accompanying drawings represents a section diametrically
through a piston with my improvements applied thereto.
Figures 2, 3, 4 and 5 are plans partly in section of modifications of the same in
accordance with my said Invention.
Figures 6, 7, 8, 9 and 10 are enlarged detailed views of my said improvements
and modifications of the same. As shewn more particularly in Figure 1 the
V-groove is formed by recessing corresponding portions of the two packing
rings α, a. The elastic ring B has its outer surface so formed as to correspond
with the groove of the packing rings and is caused to press against the said rings
by the elasticity or expanding face of the spiral spring C.
The spirals of the said springs are either of a circular or of a rectangular section
as shewn in Figure 8 and so wound as to form a spring of flattened shape as shewn
more particularly in Figures 7 and 9.
The said spring so formed is fitted upon the correspondingly shaped projections b,
formed upon the extremities of the elastic ring B, and when so fitted and in a
compressed state force apart the two extremities of the ring B, as shewn more
particularly in Figure 2.
The said ring so acted upon by the spring C, presses itself against the packing
ring a, a, and in so doing, its wedge shaped surfaces force themselves into the
V-groove of the said packing rings, the effect being that the packing rings are
pressed outwardly against the cylinder D, as well as against the flanges E of the
piston simultaneously.
In Figure 2, the piston is shewn with a single elastic ring B acted upon by a
single spiral spring C.
In Figure 3, the piston is shewn with the elastic ring formed in two segments B, B,
which are correspondingly acted upon by two spiral springs C, C.,

page_text: In Figure 4, the piston is shewn with the elastic ring formed in three
segments B, B, B, which are correspondingly acted upon by three spiral
spings C, C, C.
In Figure 5, the piston is shewn with the elastic ring formed in four
segments B, B, B, B, which are correspondingly acted upon by four spiral
springs C, C, C, C.
Other numbers of segments of rings acted upon by a corresponding number of
spiral springs may be employed when found suitable.
In lieu of forming the elastic rings B, with a recessed position upon the outer
face of the same as in Figure 1, and shewn upon an enlarged scale in Figures 7
and 8, the said rings may be formed in other suitable sections, such for example as
the section B', shewn in Figures 9 and 10 where the elastic ring is recessed upon
its inner side or surface.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed, I declare that what
I claim is =
The improvement in piston packing consisting of the elastic ring or segments
thereof acted upon by spiral or equivalent springs so that by pressing against the
internal V-shaped surface of the packing rings a, a, the said rings are forced
simultaneously outwards against the cylinder and against the flanges of the piston
as hereinbefore described and shewn upon the accompanying drawings.
ca
L
1000