Improvements in Packing Rings suitable for Engine and other Pistons, Buckets and Valves for Pumps and Compressors, and for other purposes.
Year: 1895

page_text: Date of Application, 19th Oct., 1895
Complete Specification Left, 20th July, 1896-Accepted, 12th Sept., 1896
PROVISIONAL SPECIFICATION.
Improvements in Packing Rings suitable for Engine and other
Pistons, Buckets and Valves for Pumps and Compressors, and
for other purposes.
I, JOHN SMITH RAWORTH of 24 Knkstall Road, Streatham, in the County
of London, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention has reference to an improved construction of packing unga
suitable for use with pistons for steam and other fluid pressure engines, for the
buckets and valves of pumps and compressors generally, for stuffing boxes and for
other purposes
According thereto, a packing ring, which may be of rectangular, preferably
square form in
cross section, similar to the ordinary rings in common use and
known as Ramsbottom rings, is constructed with overlapping ends or parts the
Jine of division between the adjacent sm faces of which as seen in cross section,
extends from one flat side of edge to the other flat side or edge of the ring
and is preferably a diagonal of the ung as seen in a cross section thereof
through the joint For the purpose of forming my improved joint, the ing
instead of being divided by a plain saw cut, as usual, is divided by a zig-zag cut
that is partly radial and partly circumferential, the cucumferential division as
seen in closs sections, being a diagonal to the rectangular or square section of
the ring.
The advantage of this method of cutting the packing ring is, that, without the
addition of loose plates or tongues, no open space or spaces is or are formed in the
ring by movement of the overlapping ends or parts one on the other through which
steam or other fluid can pass when the ing is in use.
It is not essential to my invention that the section of the ring should be a com-
plete square or rectangle One on even two of its corners or edges may be cut off
without affecting the tightness of the ring.
My invention can be applied in connection with packing rings made in segments,
such as are used for example in stuffing boxes, each ung then having two or more
joints of the kind herein referred to.
COMPLETE SIMULTICATION.
Improvements in Packing Rings suitable for Engine and other
Pistons, Buckets and Valves for Pumps and Compressors, and
for other purposes.
1, JOHN SI RAWORTH, late of 24 Kirkstall Road, Streatham, but now of
46 Christchurch Road, Streatham Hill, in the County of London, Engineer, do
hereby declare the nature of this invention and in what manner the same is to

page_text: be performed to be particularly described and ascertained in and by the following
statement
-
This invention has reference to an improved construction of packing ungs
suitable for use with pistons for steam and other fluid pressure engines, for the
buckets and valves of pumps and compressors generally, for stuffing boxes and for
other purposes.
According thereto, a packing ung, which may be of rectangular, preferably
Equate, form in cross section, similar to the ordinary rings in common use and
known as Ransbottomings, is constructed with overlapping ends or parts the
line of division between the adjacent sm faces of which, as seen in cross section,
extends from one side or edge to the other side or edge of the ring and diagonally
of the ing as seen in a cross section thereof through the joint. My improved
packing ring joint consequently consists of two pait radial or cross cuts connected
by a conical cut Such a joint may be made as 1 shall now explain with reference
to the accompanying diawings wherein
Fig 1 is an elevation of part of a packing ing set on edge showing how the
Joint is formed. Fig 2 is a similar view but showing the ends of the cut ring
overlapped.
Figs. 3, 4 and 5 show the packing ng joint in outside elevation, plan and cross
section respectively the latter figure showing also a part of a piston to which the
ring is applied.
Fig. 6 shows, in longitudinal section, part of a piston fitted with two piston rings
having joints according to this invention. The remaining figures are hereinafter
eferied to.
Assuming the section of the ng 1 to be square as shown, 1 make a wide cut 2
(Fig. 1) from the upper right hand corner 3 (Fig. 5) down to the diagonal
Ime 4-5, or better still down to the line 4-5 just below the diagonal line, as
shown in Fig. 7, and another wide cut 6 from the lower left hand corner 7 up to
the diagonal line 4-5 or to the live 4-5, as the case may be, these two wide
cuts being so arranged that they break through one into the other on the
diagonal line at the point 8 (Fig. 1). When the ring is compressed to fit the
cylinder, the triangular shaped ends overlap each other as shown in Fig. 2
and the cut then consists of two triangular radial surfaces connected by a comical
surface.
It is obvious that the same effect may be produced by using two rings of
triangular section superposed, each being cut through in one place and the
ings being so fastened together that the cuts shall not come opposite each
other.
Fig. 5 shows the position of the packing ring joint relatively to the piston,
which is assumed to be a single acting one and subjected to pressure on the
side 9 For a double acting piston two packing rings should be used, having
the improved joints at ranged relatively to each other as shown in Fig. 6
It will be obvious that the conical cut which is shown in the diawings as a
plain cone, may be varied by the use, of steps on curved surfaces cut on the side
of the theoretical cone demanded by the invention; for instance the cross section
of the cut might appear as shown in Fig. 9 or in Fig. 10. Also the radial cuts
may be varied almost indefinitely by rounding out the corners, as shown for example
in Fig. 11 or otherwise.
The advantage of cutting and airanging the packing ng joint in the manner
bereinbefore described, is, that without the addition of loose plates or tongues, no
open space or spaces is or are formed in the ing by movement of the overlapping
ends or parts one on the other through which steam or other fluid can pass when
the ing is in use.
It is not essential to my invention that the section of the ing should be a
complete square or rectangle. One or even two of its corners or edges may be
cut off without affecting the tightness of the ring.

page_text: My invention can be applied in connection with packing rings made in segments,
such as are used for example iu stuffing boxes, each ring then having two or more
joints of the kind hereinbefore referred to.
Having now particularly described and ascertained the nature of the said inven-
tion and in what mauner the same is to be performed I declare that what I
claim is :-
1. The division of a packing ring by means of one or more joints consisting or
each consisting of two radial or cross cuts and one conical cut substantially as
described.
2. The construction of packing rings as described and shown in the drawings.
Dated tins zuth day or July 1896.
For the Applicant,
W LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.