Improvements in Metallic Packing Rings for the Pistons and Buckets of Pumps and for other Pistons.
Year: 1898

page_text: >
Date of Application, 28th Mar., 1898
Complete Specification Left, 30th Nov., 1898-Accepted, 21st Jan., 1899
PROVISIONAL SPECIFICATION.
Improvements in Metallic Packing Rings for the Pistons and Buckets
of Pumps and for other Pistons.
We, TANGYES LIMITED, of Cornwall Works, Soho, in the County of Stafford,
Engineers, and JOHN NICHOLAS FLOYD, of No. 71, Murdock Road, Handsworth, in
the County of Stafford, Mechanical Engineer, do hereby declare the nature of this
invention to be as follows:-
The said invention has reference principally to the metallic elastic packing rings
of the pistons and buckets of pumps used for pumping dirty or gritty water but
may also be applied to pistons and pump buckets generally.
The metallic packing rings to which the said invention refers are slit or open
jointed metallic rings or rings divided crosswise or obliquely at one side.so as
to make them elastic.
In the water pistons of pumps used for pumping dirty or gritty water the
barrels of the said pumps and the packing ring of the piston become rapidly worn
so that the said piston does not fit the barrel accurately and consequently the
metallic packing rings frequently become jammed between the space left between
the water piston and pump barrel and damage results to the said pump barrel and
bucket ring.
To obviate the jamming referred to the packing rings are sometimes made of
such a thickness as to render them practically inelastic and hence of little value
as a packing. It is further found that ordinary packing rings present such a
narrow surface to the sides of the grooves in the water piston that both the rings
and grooves become quickly worn and with corresponding slack in the grooves of
the bucket so that the ring getting out of line with the pump barrel results in
damaging the said ring and pump barrel.
According to the said invention we so construct the metallic packing rings that
while their elasticity is not impaired, their durability and wearing surfaces are
increased and the jamming of the ring between the water piston and the pump
barrel effectually prevented.
We attain these objects in the following manner.
Instead of making the metallic elastic packing ring of the piston or pump
bucket plain both on its outer and inner surfaces as usual we make on the inside
of the ring a series of equi-distant ribs or projections extending across the ring
from edge to edge that is parallel to the axis of the ring. We have found in prac-
tice that four of the cross internal ribs or projections answer well but we do not
limit ourselves thereto, neither do we limit ourselves to the thickness or strength
of the ribs so long as they do not impair the elasticity of the ring.
By the use of the series of ribs on the inside of the packing ring it is made to
possess the advantages herein before pointed out.
Dated this Twenty-eighth day of March 1908
W. T. WHITEMAN,
Agent for the Applicants.

page_text: Improvements in Metallic Packing Rings for the Piston's and Buckets
of Pumps and for other Pistons,
-
We, TANGYES LIMITED, of Cornwall Works, Soho, in the County of Stafford,
Engineers, and JOHN NICHOLAS FLOYD, of No. 71, Murdock Road, Handsworth, in
the County of Stafford, Mechanical Engineer, do hereby declare the nature of the
said invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:—
The said invention has reference principally to the metallic clastic packing rings
of the pistons and buckets of pumps used for pumping dirty or gritty water, but
may also be applied to pistons and pump buckets generally.
The metallic packing rings to which the said invention refers. are slit or open
jointed rings or rings divided cross-wise or obliquely, at one side so as to make
them elastic.
In the water pistons of pumps used for pumping dirty or gritty water the
barrels of the said pumps and the packing rings of the piston become rapidly worn
.so that the said piston. does not fit the barrel accurately and: consequently the
metallic packing rings frequently become jammed between the space left between
the water piston and pump barrel and damage results to the said pump barrel and
bucket ring.
To obviate the jamming referred to, the packing rings are sometimes made of
such a thickness as to render them practically inelastic and hence of but little value
as a packing. It is further found that ordinary packing rings present such a
narrow surface to the sides of the grooves in the water piston that both the rings
and grooves become quickly worn and with corresponding slack in the grooves of
the bucket, so that the ring getting out of line with the pump barrel results in
damaging the said ring and pump barrel.
According to the said invention we so construct the metallic packing rings that
while their elasticity is not impaired, their durability and wearing surfaces are
increased and the jamming of the ring between the water piston and the pump
barrel is effectually prevented.
We attain these objects in the following manner.
Instead of making the metallic elastic packing ring of the piston or pump
bucket plain both on its outer and inner surfaces as usual we make on the inside
of the ring a series of equi-distant ribs or projections extending across the ring
from edge to edge, that is, parallel to the axis of the ring.
Figure 1 of the accompanying drawing represents in cross section and Figure 2
in plan, a metallic elastic packing ring for a piston or pump bucket constructed
according to this invention and Figure 3 represents in vertical section and Figure 4
in horizontal section, taken on the line a, a, Figure 3, a piston or pump bucket to
which metallic elastic packing rings of the kind represented in Figures 1 and 2 are
applied. The metallic packing rings, are marked b, b and are slit or open jointed at c
the slit being either straight or oblique to make the said rings elastic. Each of
the elastic packing rings 6 is plain on its outer side as usual, but the inside of the
said ring is provided with a series of ribs or projections d, d, 3, de extending across
the ring from edge to edge and parallel preferably, to the axis of the ring. In
the packing rings represented, the cross rings or projections d, d are arranged equi-
distantly on the inner side of the ring and on either side of the slit & other cross
internal ribs or projections d², 2 are provided. We have found in practice that
four or six of the cross internal ribs or projections answer well, but we do not limit
ourselves to that number of ribs, nor to the position, thickness or strength of the
internal ribs so long as they do not impair the elasticity of the packing ring.

page_text: It will be seen by an examination of Figure 3 that the metallic elastic rings b, b
are confined as usual between the body parts f, f and collar f of the piston or
pump bucket, the internal ribs or projections d, d, d, d² occupying the cut away
parts in the said body parts f, f as best seen in Figure 4.
By the use of the ribs or projections represented on the inside of the elastic
packing ring, it is made to possess the advantages hereinbefore pointed out, namely,
its durability and wearing surfaces are increased and its jamming between the
piston or bucket and barrel or cylinder prevented.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that
we claim as the said invention:―
The improvements in metallic packing rings for the pistons and buckets of
pumps and for other pistons herein before described and illustrated in the accom-
panying drawing, the said improvements consisting in providing the slit or open
jointed elastic metallic packing rings of the said pistons and buckets with a series
of internal ribs or projections arranged preferably parallel to the axes of the
rings and extending from edge to edge of the said rings for the purposes and sub-
stantially as described and illustrated.
Dated this Thirtieth day of November 1898
W. T. WHITEMAN,
Agent for the Applicants.