Improvements in Metallic Packing for Stuffing Boxes.
Year: 1891

page_text: Date of Application, 30th Oct., 1891-Accepted, 5th Dec., 1891
COMPLETE SPECIFICATION. ·
Improvements in Metallic Packing for Stuffing Boxes.
I, ROBERT FRANCIS DRURY George Street, Sheffield in the County of York,
Chartered Patent Agent 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, which has been communicated to ine from abroad by Hamlet E.
Forrest, 1161 Gates Avenue, Brooklyn, New York, United States, Mechanical
Engineer, relates to improvements in packing for stuffing boxes, the object being to
provide means for preventing the escape of steam or other fluid from the cylinder
to the outside of the packing at the point where the packing engages the stuffing-
box, and to further provide for the adjustment of the packing to stuffing-boxes in
which the seats are more or less irregular through wear or other causes.
A practical embodiment of my invention is represented in the accompanying
drawings, in which :-
:-
Fig. 1, represents a sectional view of a stuffing-box, gland and packing, with the
rod therein;
Fig. 2, is a sectional view in detail of a two part valve-ring.
A, represents the stuffing box, and B, the gland for securing the packing within
the stuffing box.
The main body of the packing is composed of separate rings C, of well known
construction, having their adjoining sides beveled in order to adjust themselves
in position to form an effective stop for the steam or other fluid which may tend
to escape from the cylinder alongside of and in immediate proximity to the
piston rod D, and held in position by suitable springs c. The springs, are
preferably located between the flange G, on the gland B, and the heads of the
fastening bolts 9, but may be inserted between the sets of packing, as is common.
To guard against the liability of the steam or other fluid escaping through
the end of the stuffing box along the space d, which is found desirable to leave
for any lateral vibration or play of the piston rod into the space b, between the
wall of the stuffing box and the outside of the packing C, I provide a valve
ring E, having its extreme diameter less than the diameter of the interior of the
stuffing box and having its interior fitted as closely as may be to the piston rod.
The valve ring E, has its upper face beveled, as shown at e, for receiving the
beveled edges on the rings C.
The valve ring E, is seated upon a seat ring f The upper flat face of the
seat ring is fitted preferably by a ground joint, to the under flat face e', of
the valve ring E, and the lower face of the said seat ring, is adapted to rest in
the end of the stuffing-box, where it may be made tight by the interposition"
between it and the end of the stuffing box of a suitable cement or packing, such,
for instance, as what is known as "usudurian." In order to insure a tight joint
between the seat-ring and the end of the stuffing box F', so that its inner edge
will be sure to seat in close contact with the inner edge of the end F1, the
space between it and the end of the stuffing box where it recedes therefrom being
tightly closed by the cement or packing. The exterior, of the seat ring f, is
fitted as close as may be to the wall of the stuffing box for the purpose of pre-
venting any considerable lateral vibration of the seat ring. The outer margin
of the upper face of the seat ring is cut away, as shown in Fig. 1, so as to
leave the annular flat seat upon which the valve ring rests substantially the same
width as the lower bearing surface on the valve ring.
While the valve ring E, is held in place under the pressure of the springs
and effectually prevents the escape of the steam or fluid under normal pressure,

page_text: it may be lifted by any water collected in the cylinder and forced against it by
the piston.
Having thus particularly described and ascertained the nature of my said inven-
tion, what I claim is :-
1. The combination with the stuffing box, the piston rod, and the packing, of
the valve ring at the end of the packing, the seat ring having one face upon
which the valve ring has a sliding engagement, and its opposite face toward the
end of the stuffing box adjacent to the cylinder head being beveled, so as
to recede from its seat as it extends outwardly from the piston rod and form a
space for cement or permanent packing, and its face toward the valve ring being
of substantially the same width as the adjacent face of the valve ring, the outer
margin of its said upper bearing face being spaced from the inner wall of the
stuffing box, substantially as set forth.
2. The combination with the stuffing box, and the piston rod, of the two rings
arranged in frictional contact with the piston rod, the ring overlapping the
horizontal joint of said rings, the upper edges of the whole being beveled to
receive corresponding shaped rings, the latter made in halves and held together
by means of screws, substantially as shown and described.
Dated the 27th day of October 1891.
RODT. F. DRURY.