Improvements in Metallic Packing.
Year: 1892

page_text: Date of Application, 18th June, 1892
Complete Specification Left, th Mar., 1893-Accepted, 6th May. 1893
PROVISIONAL SPECIFICATION.
Improvements in Metallic Packing.
I, JOHN LEWIS, of 4 Glebe Terrace, Barry Dock, in the County of Glamorgan,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved construction of metallic packing suitable
for rods such as piston rods. According thereto I arrange next the rod to be
packed several adjacent rings of anti-friction metal such as white metal or magnolia
metal each made in parts or segments. Around these rings are arranged two or
more concentric sets of split spring rings or bands (hereinafter called spring rings)
each set comprising two rings. Each split ring is of gradually increasing thickness
from one free end to the opposite part of its diameter and of gradually decreasing
thickness from that point to the other free end the arrangement being such that
when the two rings forming a set are placed together in position for use the com-
bined thickness of the two rings will be the same at all parts, or practically so.
The anti-friction metal rings and the spring rings are contained within a box or
casing formed of two parts each composed of an annular ring with an inwardly
extending flange. Between the inner surface of one of these flanges and the anti-
friction rings and spring rings is an annular plate and a coiled spring the former
being arranged next the rings. Between the outer end of the box or casing and
the gland for securing the packing in place may be interposed an annular plate
with conical rim.
Dated this 18th day of June 1892.
JOHN LEWIS,
By L. W., per F. B.
COMPLETE SPECIFICATION.
Improvements in Metallic Packing.
I, JOHN LEWIS, of 4 Glebe Terrace, Barry Dock, in the County of Glamorgan,
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 an improved construction of metallic packing suitable
for rods such as piston rods. According thereto I arrange next the rod to be
packed several adjacent rings of anti-friction metal such as white metal or
magnolia metal each made in parts or segments. Around these rings are arranged
two or more concentric sets of split spring rings or bands (hereinafter called spring
rings) each set comprising two rings. Each split ring is of gradually increasing
thickness from one free end to the opposite part of its diameter and of gradually
decreasing thickness from that point to the other free end the arrangement being
such that when the two rings forming a set are placed together in position for use
the combined thickness of the two rings will be the same at all parts, or
practically so.
The anti-friction metal rings and the spring ring are contained within a
suitable box or casing formed of a cylindrical body having an inwardly extending
flange, or of two parts each composed of an annular ring with an inwardly
extending flange. Between the inner surface of the flange of the cylindrical body
or of one of the said two parts (as the case may be) and the antifriction rings and
spring rings is an annular plate and a coiled spring the former being arranged next.
Γι

page_text: the rings. Between the outer end of the box or casing and the gland for securing
the packing in place may be interposed an annular plate with conical rim.
In the accompanying drawings,
Fig. 1 is a longitudinal section of a stuffing box provided with improved metallic
packing according to this invention.
Fig. 2 is a transverse section through the packing.
Figs. 3 and 4 are respectively an end view and section of the annular plate with
conical rin, showing a fillet or stop piece hereinafter referred to.
A is the piston rod; B, B, are three rings of white metal or magnolia metal
which surround the said piston rod and which are each formed in segments as
shewn in Fig. 2. In the arrangement illustrated the rings B are arranged to break
joint with the segments of corresponding brass rings CC which I prefer to use
but which may in some cases be omitted.
DD are two split spring rings or bands surrounding the aforesaid rings, these
rings being arranged in sets of two each spring ring being of gradually increasing
thickness from one extremity to its middle portion, and thence of gradually
decreasing thickness towards its other extremity. The rings of each set are
arranged reversely as shown in Fig. 2 so that the decreasing thickness of one is
compensated for by the increasing thickness of the other, and the combined
thickness of the two rings forming a set remains practically the same all round.
When the brass rings Čare dispensed with the innermost of the spring rings D
presses directly upon the white metal rings B.
E is the cylindrical body of the box or casing which contains the packing.
This body fits in the stuffing box F after the manner of a bushing, and is provided
with an inwardly projecting flange E¹. G is the annular plate or disc and H is
the coiled spring situated between the inner side of the flange E and the end of
the packing. This spring is of the conical volute kind, and is so arranged as to
force the packing away from the flange E¹. In the drawing this spring is
compressed to its fullest extent, and the coils appear flat. I is the annular plate
which is inserted between the casing E and the gland J of the stuffing box, for
securing the packing in place. This plate has a conical rim I' and is split or
divided as shewn, a stop piece or fillet 12 being provided to prevent escape of
motive fluid. A pair of bevelled brass rings K and L are interposed between the
plate I and the packing. By tightening up the gland J the packing rings can be
forced inward against the resistance of the spring H. As will be obvious the box
or casing may be in two parts each part having an inwardly projecting flange
such as E¹.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. Metallic packing comprising segmental anti-friction rings surrounded by
split spring rings, and situated within a box or casing containing a coiled spring,
and adapted to be placed within a stuffing box having a gland, substantially as
described.
2. My improved metallic packing constructed and arranged substantially as
described and shown.
n 1
3000