Improvements in Metallic Packings.
Year: 1895

page_text: Date of Application, 26th Aug., 1895-Accepted, 28th Sept., 1895
COMPLETE SPECIFICATION.
Improvements in Metallic Packings.
We, HARRY GORDON SMALL and GEORGE WILLIAM PARKES, of The
Frictionless Engine Packing Co. Limited, Cable Mills, Glasshouse Street, Oldham
Road, Manchester in the County of Lancaster, Managing Directors, 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 packings for piston rods, valve spindles and the like,
and its objects are to provide a mobile metallic surface capable of accurately
adjusting itself to a worn or fluted rod or to one which does not run truly, and
which may be readily applied to existing stuffing boxes without alteration.
A packing constructed and applied according to these improvements is
illustrated by the accompanying drawings, to which reference will hereinafter
be made.
Figure 1 is a transverse section.
Figure 2 is a cross section of the metallic part of the packing only.
The metallic and essential part of the packing consists of a ring or collar A,
longitudinally divided into three or more segments, by the slits a, formed
tangentially to the piston rod or the like, B, as shewn by Figure 2.
It is preferred that the collar or ring should, in the first place, be bored slightly
larger than the rod or the like with which it is to be used, in order that as the rod
wears, the segments close together so as to fit it constantly, and in order to enable
the collar or ring to open and close to accommodate any irregularities in the rod.
The tangential direction of the dividing slits ensures the lateral close contact of
the segments under all conditions, a result which cannot be obtained when the slits
are radial. Hence, there is little risk of any escape of the fluid along the slits.
If however, it be desired to prevent the possibility of such an escape, a tongue b,
may be formed or secured in or upon one side of each segment, fitting into a
corresponding groove in the contiguous side of the next segment.
The rings or collars A may be made of any suitable anti-friction metal, and may
have any desired form, but we in all cases prefer to shape the lower end to fit the
bottom of the stuffing box, and to turn down or reduce the diameter of the upper
end so that there may be room between it and the walls of the stuffing box for the
fibrous packing D, which is used in combination with the part A.
In using the packing, the segments of the ring A are arranged around the rod at
the bottom or inner end of the stuffing box, and any suitable fibrous or similar
packing is then arranged around and above the ring A, as indicated by Figure 1.
The gland is then put in place and tightened in the usual manner.
This packing
thus possesses all the advantages both of a metallic and of a fibrous packing.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. In a packing for piston rods and the like, a metallic ring or collar longi-
tudinally divided into three or more parts by slits tangential to the circumference
of the rod, substantially as hereinbefore described and as illustrated by the
accompanying drawings.
2. In packings for piston rods and the like, the combination and arrangement
with a metallic ring or collar tangentially divided into three or more segments, of