Year: 1887

page_text: I, ALEXANDER DUNGAN MARSHALL of Balmain near Sydney in the Colony of New
South Wales, 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 :—
This invention relates to those kind of packings for piston rods valve spindles &c.,
which consists of a metallic ring or rings in sections elastically kept in contact
with said rods spindles &c., and forming a tight joint around the same
matter what the pressure may be or what power so long as it be fluid pressure
may be used.
no
It has been devised in order to reduce the first cost of such packings, to provide for
easy "taking up" or adjustment and to minimise the wear and tear."
These improvements in metallic packing for piston rods valve spindles &c., consist
essentially in the special construction of the sections of the packing ring or rings
forming the joint around the rod &c. secondly in the special construction of "cod
pieces or tongues, between the sections of the packing ring and thirdly in the
combination and arrangement of rings made up of the specially constructed sections
and cod-pieces or tongues with an enclosing box and means for elastically retaining
the same against the rod spindle &c.
But in order that this invention may be clearly understood reference will now be
made to the drawings herewith in which Figure 1 is a plan view of one section

page_text: straightened out of a ring constructed according to my invention--Figure 2 a partial
section circularly through two such sections showing the cod-pieces or tongues at the
junctions and Figure 3 a section radially through a ring or coil piece-Figure 4 shows
a plan and section of one form of packing complete and in a stuffing box-Figure 5
is an elevation of the same and Figure 6 is an outside view of the enclosing case
removed from the stuffing box. Figures 7 and 8 show in partial sections a modified
form of packing ring in its enclosing case and Figures 9 and 10 are similar views of
a further modification.
"
The sections A B are formed by rivetting two turned rings together and dividing
the upper part A and lower part B at intervals but at different points on the circum-
ference so that the rivetted sections will form "laps" as shown (Figure 1). The cod
pieces C are formed T-shape, the upper part to work in the slot " in one of the
"laps" of the sections at the junction and the lower part to form a rivet in the "lap
of the section in juxtaposition. D is the enclosing case fitting the stuffing box and
formed in two or more sections-D' are fastening bolts D recesses for heads and nuts
of such bolts-D³ recesses for packing rings. E are sockets E' spiral springs-
E2 recessed screw plugs (see Figures 4. 5. and 6) F and F are grooves in case
and packing ring respectively (see Figures 7. 8. 9. and 10) G is a continuous
wire spring made joined as at G¹ (see Figures 7 and 8) H is a continuous wire
spring made by being coiled on an oval bar with one junction as at H³ (see
Figures 9 and 10).
The sections A B constructed as before described are placed together preferably
with the shaped cod pieces or tongues C at the junctions and being put around the
rod the case D is placed around the so formed ring and bolted together by bolts D'
and the springs being adjusted it is dropped into or placed in the stuffing box and the
gland screwed down (with or without ordinary packing) to keep it in place. The
springs E shewn in Figures, 4. 5. and 6 are inserted in the sockets E and plugs E
screwed down upon them until proper elasticity is attained after the case D is
screwed up but the springs G are placed in grooves F and joined up and the
spring His jointed at H before the case D is put upon the packing ring A B.
The springs E G or H as the case may be keep the ring A B close against
the rod &c. I and make a pressure tight joint while the cod-pieces C prevent
any escape at the junctions. I prefer to use two rings A B in each enclosing
case. To take up wear it is only necessary to file a small portion of the ends
of the laps and cod pieces away when the rings will again form a pressure tight
joint.
I would have it understood that I do not confine myself to any particular size of
packing ring or case to the number of rings in each case to the number of sections
in each ring or in each case to the particular metal of which the several parts may
be constructed nor to the particular kind of spring used to ensure elastic contact
of the ring with the rod spindle &c. so long as the nature of my invention be
retained but
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim as my
improvements in metallic packing for piston rods valve spindles &c. is
First. The special manner of constructing metallic packing rings consisting in two
turned rings rivetted together and divided the same number of times but at different
points on the circumference so as to form sections with "laps" substantially as
herein described and explained.
Second. The special construction of T-shaped cod-pieces or tongues rivetted at the
inner end of a lap of a ring section and fitting a slot in the outer end of a lap
of the adjacent ring section substantially as herein described and explained and as
illustrated in the drawing.
Third. The special combination and arrangement of the divided packing ring or
rings with "laps" and the T-shaped cod-pieces with a divided enclosing case and

page_text: means for elastically pressing the rings against a piston rod valve spindle &c.
substantially as herein described and explained.
Fourth. The special combination and arrangement of mechanical parts forming
metallic piston rod or valve spindle packing substantially as herein described and
explained and as illustrated respectively in Figures 45 and 6 in figures 7 and 8
and in figures 9 and 10.
Dated at Sydney in the Colony of New South Wales this Eighth day of
August One thousand eight hundred and eighty seven.
A. D. MARSHALL.
Haseltine, Lake, & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.