Year: 1895

page_text: Date of Application, 24th Apr., 1895
Complete Specification Left, 24th Jan., 1896-Accepted, 29th Feb., 1896
I, THOMAS HENRY HOLMES, of Wilkes-Barré, Pennsylvania, U.S.A., Manu-
facturer, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to provide a simple packing to prevent leakage
around piston rods, valve-stems and the like.
The improved packing comprises an outer ring composed of segments of angular
(preferably L-shaped) section which ring is placed around the piston within the
stuffing-box. A groove around the periphery of each segment contains a spiral
spring bent around the ring.
An inner ring, composed of segments, fits in the recess, formed by the shape of
the outer ring, and the segments are pressed upon the piston or other rod by a
spiral spring coiled within a groove formed on the face of each segment of the
inner ring.
'
It will be understood that the spaces between the segments of the outer ring do
not coincide with those of the inner ring. A disc of oiled paper or rubber may
be placed between the rings and the end of the stuffing box, and also between them
and the gland.
1007
W. H. MUNNS,
Agent for Applicant.
торгогошень і
3534
I, THOMAS HENRY HOLMES, of Wilkes-Barré, Pennsylvania, U.S.A., Manu-
facturer, 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 :-
My invention relates to that class of packing for piston rods, valves and the
like, in which nests of packing rings are contained in boxes on the head of the
cylinder or valve box, the object of my present invention being to apply a com-
pression spring to the segments of one or more of the rings of either nest without
recessing or otherwise destroying the continuity of the outer face of either segment,
whereby the spring is protected and when the spring is so applied to the inner ring
a close joint is formed between the inner and outer rings to prevent the passage of
steam between them.
In the accompanying drawings
--
Figure 1 is a sectional view of a piston-rod packing embodying my invention.
Fig. 2 is a perspective view of the two rings comprising each set, showing the
inner ring detached from the outer ring.
Fig. 3 is a sectional view showing a modified construction of the outer ring;
and

page_text: Fig. 4 is a sectional view illustrating a special, and in some cases, preferred
construction of the inner ring.
In Fig. 1, A represents part of the usual stuffing box casing of a steam engine
cylinder and B part of the piston rod.
Mounted one upon the other beyond the casing A, are the three boxes D, D¹, D',
the inner box being seated upon the outer end of the casing A, and the outer box
constituting the bearing for a cap or cover plate F, which is confined to the
casing A by means of bolts a and nuts b. Each of the boxes D, D', D', carries
a set of packing rings for bearing upon the piston rod B, and it will be evident
that although I have shown three boxes and three sets of packing rings more or
less than this number can be used without departing from my invention, which
relates to the construction of the packing rings and especially to the means of
applying the compression spring.
The outer ring of each set comprises three segments d, d, d, each of L-shaped
or angular cross section, each of these segments having in its outer face a groove
for the reception of an annular coiled spring f, which tends to draw the segments
inwards so as to cause their inner faces to bear snugly upon the piston rod B.
The inner ring is composed of three segments 9,.g, g, of such shape and size as
to fit within the recess formed by the L-shaped segments of the outer ring, the
latter bearing snugly against, and forming a tight' joint with, the outer face and
one side of each segment of the inner ring while the other side of each segment
bears against the adjoining box and the inner face of each segment against the
piston rod.
It is necessary that the inner segments as well as the outer ones shall be acted
upon by a spring tending to draw them inward into contact with the piston rod,
but in order not to break the continuity of the outer faces.of the segments of the
inner ring by the formation therein of recesses for the reception of the com-
pressing spring 'I adapt said compressing spring / to recesses i extending laterally
inward from one face of each segment of said inner ring, preferably in that face
of the ring which bears against the adjoining box as shown in Fig. 1. By this
means moreover the spring is protected while the rings are being handled or
transported and is less liable to displacement or injury than an external spring
would be, hence the lateral recesses for the reception of the spring, may, if
desired, be used in the segments of the outer ring as well as in those of the inner
ring.
In Fig. 3 I have shown a modified form of the packing in which the outer ring
is composed of segments T-shaped in cross section and receives au inner ring on
each side of the same, while in Fig. 4 I have shown a construction in which the
two inner rings j and k are employed, the ring; surrounding the ring k and the
outer ring having the lateral recess for the reception of the compression spring.
The segments of each ring of the packing are held in proper relation to each other
so as to break joints with the segments of the other ring or rings by means of
pins m entering the space between the segments of the adjoining rings. For
instance as shown in Fig. 2, the segment d has a pin m projecting laterally into
the space between the segments g₁ and g² of the inner ring, and in Fig. 4 one of
the segments of the outer section of the inner ring has a pin m projecting radially
into the space between two of the segments of the inner section of said inner ring.
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 is:-
(1.) The combination in a rod packing of an outer ring composed of segments of
angular cross section, with an inner ring composed of segments fitted within those
of the outer ring, a spring for compressing the segments of the outer ring against
the rod, and a compression spring for the inner segments contained within recesses
extending laterally inward from one side of each of the segments of said inner
ring, substantially as specified.

page_text: (2.) The combination of a packing ring composed of segments, each having a
recess extending laterally inward from one of the side faces of the same, with an
annular compression spring occupying said lateral recess substantially as specified.
W. H. MUNNS,
Applicant's Agent.