Improvements in Metallic Rod Packing.
Year: 1891

page_text: Date of Application, 6th Jan., 1891-Accepted, 7th Mar., 1891
COMPLETE SPECIFICATION.
Improvements in Metallic Rod Packing.
I, EDWIN PEAR MONROE, of No. 133, South Fourth Street, Philadelphia, in
the County of Philadelphia, and State of Pennsylvania, United States of America,
Mechanical 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 :-
My improvements relate to what is known as segmental metallic rod packing, of
the character shown in English Patent No. 4890 of 1880. Such packings are
usually self adjusting, that is to say adapted to move within a packing case laterally
to accomodate the lateral movements of piston rods &c.
In such packings as heretofore made the case has been stationary, and the parts
of the packing within the case have been made to move within it to correspond to
the lateral or vibratory movements of the rods.
My present invention relates to a rod packing in which the case is made moveable
with the packing blocks instead of remaining stationary as in previous devices.
Where the case is made stationary it is necessary to cut it away sufficiently to
allow the rod ample lateral play. This cutting away of the case diminishes the
bearing for the packing blocks so as to render their fastening somewhat insecure,
especially after a little wear of the blocks has taken place. By the use of my
present improvement this objection is obviated, because the hole through the outer
end of the case need only be made very slightly larger than the diameter of the
rod, thus leaving ample bearing surface for the packing blocks.
In the accompanying drawings illustrating my invention,
Figure 1 is an elevation partly in section; and
Figure 2 is a plan view, looking from the inner side of the packing.
Referring to the letters upon the drawings, A indicates the case; B the rod;
Ca section of a cylinder head; and D a stuffing box integral therewith.
E indicates a packing block, and Fanother packing block, in practice placed at
right angles with the one first named.
G indicates an annular plate, preferably of brass, or other soft metal having
corrugated surfaces, so as to better form a steam tight joint under compression.
This plate rests upon the outer end of the stuffing box, and forms a seat for the
annular spring plate H carrying springs I, upon which rest the follower K. The
spring plate H is provided with an annular projection L forming a shoulder, against
which the follower bears to prevent any lateral movement of it.
M indicates an annular block plate resting upon the follower, and forming a seat
for the inner set of the packing blocks. The outer set rests against the case at P,
as shown in Figure 1. Each set of blocks is provided with springs, as usual, for
moving the blocks laterally to compensate for wear.
The spring plate H is provided with screw holes for the threaded bolts Q which
secure it to the outer end of the stuffing box. It serves to support the ball and
socket ring R, which has a curvilinear bearing surface at S fitting the bearing
surface of the case. T indicates an annular clamping plate which clamps the ball
and socket ring to the spring plate H, and is held in place upon the spring plate H
by screw bolts U.
The
By this construction it will be seen that the space between the outer end of the
casing and the rod at V, is only slight as compared with the space usually necessary
to accomodate the operation of metallic packing as heretofore constructed.
result is, that the case bears upon a much larger surface of the packing blocks E,
and secures them against any rocking movement, and permits them to be thrust in
by springs to compensate for wear until they are almost entirely worn out. At the

page_text: same time I get the usual rocking movement and lateral sliding movement necessary
in this class of packings. The case rocks on the curvilinear face of the ball and
socket ring, and the ring slides on its bearings and the block plate M slides on the
follower.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
:-
1. In a metallic rod packing, the combination of a casing adapted to have a
rocking and a sliding movement, the ball and socket ring R, the block plate M, and
the follower K constructed and arranged as set forth.
2. In a metallic rod packing, the combination with a casing adapted to have a
rocking and a sliding movement, the ball and socket ring R, the block plate M, the
follower K, the spring plate H, and the annular clamping plate constructed and
arranged substantially as set forth.
3. In a metallic rod packing, the combination of a casing adapted to have a
rocking and a sliding movement, the ball and socket ring R, the block plate M, the
follower K, and the segmental packing blocks adapted to move with the case and
provided with springs bearing against the case to compensate for wear of the blocks,
substantially as set forth.
Dated this 6th day of January 1891
CARPMAEL & Co.,
Agents for the Applicant.