Improvements in Pistons for Steam and other Engines.
Year: 1898

page_text: Improvements in Pistons for Steam and other Engines.
I, ADAM DOBSON, of 58, Clifton Park Avenue, in the City of Belfast, and
County of Antrim, in Ireland, Engineer, do hereby declare the nature of this
invention to be as follows -
My invention relates to the construction and arrangement of the piston block
and rings for use in steam and other engines. It consists in forming the piston
block with a solid flange on each side of which I place a packing ring made
steam tight on the contiguous or working face of such solid flange and held
against it by a wave or other spring or springs pressed and adjusted by means
of a junk ring or piston cover adapted to the pressure of the steam or other
motive agent on the steam tight face of the piston flange.
The steam or other motive agent may be admitted through holes in the junk
ring or piston cover or I may allow it to act on the packing rings directly.
By this arrangement I provide a double acting piston working on: the single
action principle.
Datel this old days of Natalia” 1900
Dated this 21st day of October 1909.
HUGH HYNDMAN,
10, Chichester Street, Belfast, Agent for Applicant.
I, ADAM DOBSON, of 58, Clifton Park Avenue, in the City of Belfast, and
County of Antrim, in Ireland, 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:-
My invention relates to the construction and arrangement of the piston block
and rings for use in steam and other engines.
It consists in forming or furnishing the piston block with a solid flange, on
each side of which I place a packing ring made steam tight on the contiguous
or working face of such solid flange and held against it by a wave or other spring
or springs pressed and adjusted by means of a junk-ring or piston-cover and
adapted to the pressure of the steam or other motive agent on the steam-tight
face of the piston-block flange.

page_text: The steam or other motive agent may be admitted through holes in the junk
ring or piston cover and piston-block or I may allow it to act n the packing
rings directly.
By this arrangement I provide a double acting piston working on the single
action principle, the steam operating alternately on each packing-ring so as to
drive the piston from either end of the cylinder.
Where the solid flange is formed upon the piston-block a second junk-ring or
piston-cover must be employed to enable a wave spring to be placed at each side
of such flange but I prefer the arrangement hereinafter described.
And in order that my said invention may be more fully understood I shall
now proceed to refer to the figures upon the sheet of drawings hereunto annexed,
the same letters of reference being used throughout both of such figures to indi-
cate the same or corresponding parts of my said improvements:-
Fig. I is a plan of a piston-head from which one half of the junk-ring or cover
has been removed, showing the piston-block furnished with a solid flange, half
of one of the packing-rings and half of a wave spring by which such packing-ring
is held against the solid flange, and
Fig. II is a side elevation of a piston-head, one half of the figure being a
radial section showing the block, furnished with a solid flange between it and
the junk-ring or piston cover, a packing-ring on each side of such solid flange,
wave springs holding the packing-rings against it and being pressed and ad-
justed by means of the single junk-ring or piston-cover in conjunction with the
piston-block, while the other half of the figure shows the periphery of the head
with portions of the packing-rings in section exposing so much of an edge of
each of the wave springs.
a is the piston-block furnished with a steam-tight solid flange, b; ce are the
packing-rings made steam tight on the working faces of the flange, b, and d d
are wave springs holding and pressing the packing-rings, c, c, firmly against
the contiguous faces of the flange, b, and adapted to the pressure of the motive
agent on such flange; e is the junk-ring or piston-cover and f is a screw keeping
it, e, in position and holding the flange, b, firmly against the piston-block, a;
7, 9 are steam tight pieces placed across the openings or transverse cuts in the
packing-rings, cc, and is the piston-rod; ii are holes in the junk-ring or
piston-cover, e, and piston block, a, through which steam may be admitted to
the packing-rings, e c, if desired.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed I would have it to be
understood that I do not claim as of my invention or the exclusive use of piston-
blocks formed or furnished with solid flanges and packing-rings made steam tight
and held against a solid flange by a wave or other spring except when the same
are constructed and employed according to my invention nor do I claim the use
of piston-blocks, piston-rods, junk-rings or piston-covers, screws, bolts or any
of the separate mechanical accessories or parts constituting my improved steam
and other pistons but I declare that what I claim is;-
1. The use in steam or other engines of a piston-block with a solid flange con-
structed and employed substantially in the manner and for the purposes herein-
before described and shewn in the drawings hereunto annexed.
2. The use in steam or other engines of packing-rings held and pressed by
wave or other springs constructed and employed substantially in the manner and
for the purposes hereinbefore described and shewn in Fig. II of the drawings
hereunto annexed.
3. The use in steam or other engines of a piston-block arranged with a solid flange,
packing-rings and wave or other springs constructed and employed substantially
in the manner and for the purposes herein before described and shewn in the
drawings hereunto annexed and
4. The combination and arrangement of parts constituting my improved pistor

page_text: for steam and other engines constructed and employed substantially in the manner
and for the purposes hereinbefore described and illustrated by the drawings here-
unto annexed.
Dated this 7th day of A
1800
HUGH
HYNDMAN,
10, Chichester Street, Belfast, Agenti for Applicant.