Improvements in Metallic Packing for Piston-rods, Valve-rods, or the like.
Year: 1889

page_text: Date of Application, 18th Jan., 1889
Complete Specification Left, 18th Nov., 1889-Accepted, 18th Jan., 1890
PROVISIONAL SPECIFICATION.
Improvements in Metallic Packing for Piston-rods, Valve-rods, or
the like.
I, RICHARD JEROME PARIS of 1 India Buildings Liverpool in the County of
Lancaster Engineer, do hereby declare the nature of this invention to be as
follows:-
The invention has for its object a metallic packing for piston rods, valve rods or
the like, applicable for preventing leakage of steam from a cylinder or steam chest
of an engine.
In carrying out my invention, I provide an annular shell or ring bored to
approximately the same diameter or a little larger than the rod or spindle to which it
is desired to apply the packing. On the inside face are one or more circumferential
grooves or recesses at suitable distances apart, each of which is made to receive an
annular packing ring. In the sample I propose to construct, I shall employ three
rings of phosphor bronze or other suitable material each split or cut at one part of
their circumference and arranged so as to break joint.
The rings may be cut diagonally or otherwise and between the faces of the rings so
cut, I insert a wedge or packing piece so as to expand the ring. The elasticity of the
latter may in some cases be sufficient to hold the packing pieces in position, but I
generally prefer to bind the ends of the rings firmly against the aforesaid packing
pieces by suitably shaped clasps or connecting strips, inserted or embedded in slits or
slots suitably arranged in the rings, and preferably passing through a slot in the
packing strips. The said slots may be chamfered and the connecting strip after it is
put in, rivetted over, if desired, so as to hold it in place.
The rings can now be bored to the size required, if it is desired so to do. The rings
may be made to increase in thickness on either side of the part where they are cut or
split, to the point farthest therefrom.
I propose to make the annular recessed shell in two halves so that the rings can
easily be inserted or removed. The two parts can be fastened together in any
convenient manner.
The shell is made so that it can be received by the stuffing box and is held fast in
position by the gland, or the shell might be dispensed with and circumferential
recesses made on the inside faces of the walls of the stuffing box or on the gland.
When the rod or rings become worn, the annular shell can be taken out and
separated, the packing or insertion pieces removed and reduced in thickness, and the
metallic packing can thereby be compressed or reduced to the required diameter.
I propose to leave a suitable amount of clearance between the rings and the bottom
of the circumferential grooves, in order to provide a certain amount of play or move-
ment for the rod, also in some cases between the side faces of the rings and grooves.
The bottom of the latter may be hollowed out or enlarged, so as to leave comparatively
small side bearing surfaces for the rings.
Dated this 17th day of January 1889

page_text: grooved shell within the stuffing box, the said ring being initially of slightly
smaller internal diameter than the diameter of the rod, and adapted to maintain
contact with the rod by virtue of its elasticity, and having a tongue piece E placed
transversely across the cut between the adjacent ends c c of the ring to prevent the
passage of steam therethrough, substantially as described.
2. The improved metallic packing for the stuffing boxes of piston rods, valve rods,
or the like, combined and arranged substantially as described and shown.
Dated this 12th day of November 1889.
WM. P. THOMPSON & Co.,
Liverpool, Manchester, and London, Patent Agents.
WM. P. THOMPSON & Co.,
Liverpool, Manchester, and London, Patent Agents.