Improvements in Metallic Packing for Steam Engines and Pumps.
Year: 1896

page_text: Date of Application, 24th Mar., 1896-Accepted, 6th June, 1896
COMPLETE SPECIFICATION.
Improvements in Metallic Packing for Steam Engines and Pumps.
JAMES ALLAN 10 Forster Street Blyth Northumberland Marine Engineer
CHARLES BENJAMIN CROWE Bothal Morpeth Northumberland Clerk in Holy
Orders and THOMAS ALFRED REED Bute Docks Cardiff Consulting 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 :-
It is a form of metallic packing designed to meet the higher pressures of steam
and water engines now in use and is especially applicable for hydraulic pump rams.
and other bigh pressure engines.
The construction of the packing is as follows:-
An angular section ring is made of brass, copper or gun or other suitable metal
the base of which bears against the rod or ram and is recessed out to form a thin
shell. The recessed portion of the ring is fitted with an anti-friction metal ring..
To secure a perfect cover at the joints necessary to allow of adjustment for wear,
sections are cut out of the shell ring and the anti-friction metal ring forms a.
tongue piece for each section of ring. The ring which bears against the rod or
ram is fitted to a rectangular shaped ring of brass or anti-friction metal the base.
of which is fitted accurately to the side of the stuffing box. These two rings
form a complete cut off against the sides of both rod and stuffing box.
For more effectual use against hydraulic or high pressure steam a series of rings.
exactly as described are fitted to nearly fill the stuffing box sufficient room only
being left for say one ring of fibrous packing which is necessary to act as a.
cushion.
In cases where it is necessary that the packing should be floating the rings that
take the stuffing box can be made smaller than the diameter of the box by
preference solid, or if required can be cut in two and dovetailed or screwed together
so as to form a solid ring. This ring will work against a flat ring of brass
or white metal which is in diameter an accurate fit in stuffing box but.
sufficiently large in diameter of hole to keep it clear of the rod or ram when.
vibrating.
In order that this form of metallic packing may be better understood we
hereby append drawings showing section and plan of both solid and floating-
descriptions.
Figure 1. shows section and plan of solid or rigid packing suitable for rams that.
work perfectly true having no vibration in stuffing box.
The ring A is the bronze shell or case ring covering the antifriction metal.
ring B, the two combined form a true and adjustable packing ring. The ring C
is a rectangular ring the action of which is that when the packing is compressed.
the ring C forms a true packing against the stuffing box on the wedge principle.
the pressure keeps the rings against both ram and stuffing box.
Figure 2 shows section and plan of a floating packing suitable for rams that
work out of truth or those that vibrate in the stuffing box.
In this case ring C forms a solid ring and is of smaller diameter than the
stuffing box the flat ring D in this case acts as the packing ring against the
stuffing box the ring CC being free to slide on the faces of the ring D
according to the vibration. The action of the rings A & B is the same as in.
Figure 1.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim as novel is
The angular shaped ring, hollow and fitted with antifriction metal and the
manner of forming the tongue piece as herein described. The advantages
are that the hollow ring being pliable it requires little pressure to keep it a
perfect fit against both the antifriction metal ring and the rod or ram,
that it forms a complete cut off as against the rod in the space usually
occupied by one ring. Thus one ring of this description is equal to a complete
set of ordinary packing yet only occupies about say a fourth of the depth thus
making it possible with a series of these rings to withstand almost any
pressure or steam or water at present in use with the minimum amount of surface
friction.
Dated this 18th dur of March 1806
JAMES ALLAN.
C. B. CROWE.
THOS. A. REED.