Improvements in and relating to Packing for Piston Rods.
Year: 1893

page_text: COMPLETE SPECIFICATION.
Improvements in and relating to Packing for Piston Rods.
I, CYRUS SUMNER DEAN, a subject of the Queen of Great Britain, residing at
Fort Erie, in the Province of Ontario, Dominion of Canada, Gentleman, 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 packing for piston and other rods where it is designed
to preserve a close joint and lubricate the said rod.
The object of the invention is to obtain a steam tight joint between the piston
rod and the cylinder head through which the said rod works and at the same time
prevent burning of the packing and an unnecessary wear of the rod, the latter
being effected by a proper lubrication of the said rod.
The improvement consists essentially of the novel features and the peculiar
construction and combination of the parts which will be hereinafter more fully
described and claimed and which are shown in the annexed drawing, in which-
Figure 1 is a central longitudinal section of a stuffing box and gland, showing the
application of the invention and the relative disposition of the parts.
Figure 2 is a side view of the exterior cap of the casing which encloses the
packing.
Figure 3 is a side view of the inner cap of the said casing.
Figure 4 is an end view of the inner cap, showing the relative position of the
projections on the adjacent cap by dotted lines, i.e., when the two casings are so
disposed that the projections on the opposing ends of each stand directly opposite
the space between the projections of the other.
Figure 5 is an end view of a modified form of cap, the same being made in halves
so as to be readily and conveniently fitted around piston rods of engines now in
use, thereby obviating the removal of the cross head or piston.
Figure 6 is an end view of the band which is fitted around the parts shown in
Figure 5 to hold them together.
Figure 7 is a section of the cap composed of the parts shown in Figures 5 and 6.
In the accompanying drawing, forming part of the Specification, the reference
letter M indicates the head of the cylinder, B, a stuffing box projected from the
said head, C a gland, N bolts threaded at their outer end and connected at their
inner end with the outer flange of the stuffing box, and K nuts threaded to corre-
spond with the threaded ends of the bolts N on which they are mounted and adapted
to advance the gland within the stuffing box to compress the packing therein in the
ordinary manner.
The packing is provided in two parts, each part comprising two caps D and L,
which form a casing, and the textile or compressible packing material E which is
enclosed within the said casing. Each of the caps, D, and L are similarly constructed,
the cap D being the smaller and constructed to slide within the open end of the cap L.
Projections d provided on the outer ends of the cap D serve to hold the two parts
of the casing sufficiently separated to admit of the lubricant passing between the
opposing ends of the said parts and reaching the piston rod A so as to lubricate the
same. These projections may be of any suitable form, the circular form shown
being preferable in that greater clearance space is obtained between then than has
been found feasible with other forms. These projections should be close enough
together to prevent the projections on one cap extending into the space between the
projections of the other cap. This feature of construction is best shown in Figure 4.
The casing of each part of the packing is of slightly smaller diameter than the
stuffing box to permit it to adapt itself to the vibratory motion of the piston rod in
•

page_text: the operation of the engine without detriment to any of the other parts. A metal
washer F is located at each end of the stuffing box, and exterior to this washer is
placed a rubber or other flexible gasket H to preserve a steam tight joint at the
end of the stuffing box.
The oil cup,
is connected with the stuffing box by means of the tube i,
preferably at a point near the open end of the cap L, which is located at the open
end of the said stuffing box. The lubricant enters the space between the ends of
the cap L and passes between the opposing ends of the cap D to the piston rod A
which takes it up and carries it to the right and the left to effectively and properly
lubricate the packing and the piston rod.
In some cases it has been found expedient to construct the cap in two parts, as
shown in Figure 5, as when it is intended to apply the invention to engines now in
use, thereby obviating the removal of the cross head or piston for purposes of
applying the packing. After the two parts of the cap are placed about the piston
rod the band O is sprung around them and solder flowed between their opposing
sides to secure the parts of the cap and band together by what is known as the
sweat joint.
In assembling the parts the flexible packing e is placed within the casing and the
latter is slipped on the piston rod, care being observed to have the inner ends of
the cap D come opposite to each other so that oil passages will be provided to
admit the lubricant passing directly to the piston rod. It will be observed that
the lubricant is supplied to the piston rod at a point midway between the ends of
the packing, hence there will be no waste of the lubricant, because the excess will
be wiped off by the said packing, as will be readily understood.
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. The combination with a stuffing box baving an oil cup communicating there-
with, of two metal casings placed within said stuffing box and mounted on the
piston rod and enclosing packing material, the casings having projections integrally
formed on their inner ends to abut and form oil spaces between the said inner ends
of the casings, substantially as and for the purpose described.
2. The combination with a stuffing box having an oil cup communicating therewith,
of two metal casings placed within said stuffing box and mounted on the piston rod
and enclosing packing material, each casing consisting of telescoping parts and
having projections on its end to form oil spaces at the ends of the casing for the
passage of the oil to the piston rod, and means for pressing the telescoping parts of
the casings together to compress the packing material, substantially as and for the
purpose specified.
3. In a piston rod packing, the combination of a stuffing box, a gland, means for
advancing the gland within the stuffing box to compress the packing, an oil cup
communicating with the stuffing box about midway of its ends, flexible gaskets, one
at each end of the stuffing box, a metal washer for each gasket, and a packing of
slightly smaller diameter than the stuffing box composed of two parts which are
placed end to end, each part comprising textile packing, the opposing ends of the
inner caps having circular projections, substantially as and for the purpose set
forth.
A
11000
uay
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.