Improvements in Metallic Packing.
Year: 1898

page_text: Date of Application, 21st Feb., 1898-Accepted, 9th Apr., 1898
COMPLETE SPECIFICATION.
Improvements in Metallic Packing.
I, CHARLES ANDREW REINHOLD MANSFELDT, of 36, Pollard Street, South Shields,
in the County of Durham, 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: -
8
My invention relates to metallic packing and has for its object to provide
simple, cheap and efficient packing for high pressure steam engine cylinders and
such like purposes.
According to my invention I enclose the soft metal packing rings and spring
carrying parts in one casing formed in two parts and suitably joined, one end having
a recessed packing ring of soft metal. Two or more piston rod packing rings are
arranged within the casing each formed in two or more sections cast separately and
one or both of the adjoining faces of each section is or are provided with a facing
of muntz or other similar or suitable hard metal to prevent deformation or co-
hesion of the adjoining surfaces under heat and pressure and to provide a steam-
tight working surface for the sections when in use.
In further description I will refer to the accompanying sheet of drawings in
which Figure 1 is a part sectional elevation of a packing constructed in accordance
with my invention and fitted to a stuffing box. Figure 2 is a plan of the packing
rings within the casing, Figure 3 is a perspective view of one section thereof and
Figure 4 is a modified form of spring carrying parts.
A is the cylinder stuffing box and B the gland, C is a solid ring between the
gland and the packing casing, the ring may be dispensed with if desired. The
ring C or the bush 6 of the gland B receives and abuts against one end d° of the
casing D. The inner end of the casing D carries and is recessed to receive a soft
metal packing ring & adapted to make a steam tight joint against the neck bush a.
The casing D is of less diameter than the interior of the stuffing box both its ends do
and being capable of a sliding movement over the surfaces upon which they
make contact thereby forming a floating packing allowing free lateral movement of
the piston rod in the usual manner.
Within the casing D are arranged the soft metal packing rings P of suitable
form, dimensions and number, adapted to be received between the bevelled
surfaces d³ and ³ respectively of the casing D and spring carrying parts or
rings R R. These rings R R are arranged to receive between them in suitably
formed recesses springs such as ss arranged as shown or otherwise conveniently;
the part R has a rim or annular projection adapted to be engaged and kept in
position when the gland is removed or released by a similar projection or recess d'
upon or in the interior of the casing D. All the parts other than the packing
rings P may be formed in two parts for convenience of attachment and secured
together by suitably arranged recessed screws or bolts such as shown at d for
the casing and at r for the rings R, R¹.
The soft metal packing rings P are formed of two or more sections as described
three being shown in the drawings; each section is cast in one piece for the purpose

page_text: of obtaining a true circle corresponding with the outer circumference of the piston
rod, which accuracy of fit would not be obtained if the rings were first cast whole
and then cut as is the usual practice; further upon one or each of the ends or
adjoining faces of the sections I cast or otherwise secure a facing of muntz or other
suitable hard metal of convenient thickness thereby preventing the deformation,
cohesion or sticking together of the soft metal sections of the ring under the heat
and pressure to which they are subjected in use. A packing ring section so made
is shown in Fig. 3, p being the muntz or other hard metal facing, Fig. 2 is a plan
of a pair of packing rings formed in three sections and in position upon the piston
rod the divisions being arranged at an angle as shown.
In Fig. 1 the rings R, R¹, are shown as joined by means of guiding pins t screw-
ing from one into the other and allowing of a sliding movement but in Fig. 4 I
have shown a modified arrangement in which the rings R R¹ may be similarly
interlocked by a sleeve W with enlarged edge w¹ upon the ring R extending into a
recessed part 1 of the ring R¹ and engaging as shown, the parts being placed in
position when the rings are in halves before joining. I may in some cases employ
both the interlocking sleeve and recess and the guiding pins as at t Fig. 4. The
intervening springs s, S, are arranged in recesses as usual or otherwise
conveniently.
The parts of the packing may be readily assembled in position the spring carry-
ing parts being temporarily retained by the projection d' whilst the parts are
assembled and the outer casing fitted and the whole packing placed in position:
and it will be seen that when in position the casing has an easy transverse move-
ment in the stuffing box and the packing ring d prevents the passage of any steam
to the outside of the casing D and should this ring in time become worn away the
end of the casing itself, owing to the constant movement of the parts will have
acquired a sufficiently good surface to form a steam tight joint. The passage of
the steam in the other direction is prevented by the packing rings P; on screwing
up the gland B the pressure is taken up and transmitted to the packing rings P
by the spring s, s between the rings R, R. Thus a simple and cheaply manu-
factured packing is produced being as efficient in action as those of a more
complicated and expensive nature.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what I
claim is :-
1. A metallic packing comprising the combination of enclosing casing D having
packing ring d2 and internal annular projection with piston rod packing rings
such as P and spring carrying rings R, R¹ (with or without the modification shown
in Fig. 4) having annular rim a projection r all arranged and adapted for operation
substantially in the manner and for the purposes set forth.
2. For use in metallic packings; soft metal packing rings P formed of
separately cast sections faced on one or both ends with muntz or other suitable hard
metal cast thereon or affixed thereto substantially in the manner and for the
purposes set forth.
3. For use in metallic packing; soft metal packing rings P formed in two or
more sections each section having one or both ends faced with muntz or other
suitable hard metal substantially in the manner and for the purposes set forth.
4. The combination and arrangement of parts above defined together forming
my improved metallic packing as described and illustrated.
PRYOR & HARVEY,
Agents, 3, St. Nicholas' Buildings, Newcastle-on-Tyne.
PRYOR & HARVEY,
Agents, 3, St. Nicholas' Buildings, Newcastle-on-Tyne.