IMPROVEMENTS IN PISTON PACKING
Year: 1885

page_text: I HERMANN KÜHNE of 34, Great Saint Helens in the City of London in the
County of Middlesex, Engineer, do hereby declare the nature of my Invention for
"IMPROVEMENTS IN PISTON PACKING" to be as follows:-
For the purpose of keeping the packing rings tight against the walls of the
cylinder as well as against the piston covers or against one another I apply dished
plates of convenient shape having circular or other suitable corrugations which
give the dished plates elastic force simultaneously in the direction of the radius
and axis of the cylinder-This invention is applicable to the pistons for steam or
other engines and to the pistons of air water or other pumps.

page_text: I, HERMANN KÜHNE of 34, Great Saint Helens in the City of London in the
County of Middlesex Engineer, do hereby declare the nature of my said 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 consists in keeping the Packing rings tight against the Walls of
the Cylinder as well as against the Piston covers or against one another by the
application of dished plates of convenient shape the said dished plates having
circular or other suitable corrugations which give the dished plates elastic force
simultaneously in the direction of the radius and axis of the cylinder.
Referring to the illustrations Fig. 1. and 2 represent two different modes in
which my invention may be carried out. A is the Piston rod upon whose cone or
otherwise the body of the Piston is fixed in the usual manner, the body consisting
of two covers drawn together by a nut H or several bolts and nuts K or in any
other suitable manner. At the point G where the two piston covers butt against
one another or at any other suitable place on the boss of the piston a recess or
groove is provided into which the inner circumference of two corrugated dished
plates or disks hereafter called disks, D D, are fitted so that by tightening the nut
or nuts which hold the body of the piston together the disks are held firmly in
their places. The purpose may be attained by a single disk, pressing against one
or more packing rings, but preferably the disks are applied in pairs each disk con-
sisting of one plate only and the required elastic force of the disk or disks may be
obtained by combining two or more plates of different diameter so as to build up
an elastic disk in a manner similar to that applied in the construction of carriage
springs. At their outer circumference the disks fit into packing rings E E, which
are thereby tightly pressed against the cylinder walls as well as against the piston
cover or covers and as the pressing tendency of the disks will be nearly the same
at any part of their circumference the packing rings will be held uniformly against
the opposite faces in the directions required. The depth and shape of the corru-
gations as well as the thickness and elasticity of the disk or disks at different
parts or the number of separate plates applied may be varied in accordance with
the circumstances so as to exert exactly the required pressure in both directions.
The proper adjustment of the elastic force of the disk or disks may be either
obtained by fitting the two disks D D, firmly together in the centre and giving
the disk or disks the required diameter as shown in Fig. 2 or washers of a required
number and thickness may be inserted in the said recess or groove G within the
boss of the piston the said washers and the thickness of the disks just filling up
the said groove when the covers are screwed tightly together. By varying the

page_text: position of the washers with regard to the disks the elastic force can be adjusted as
required as shown in Fig. 1.
The disks or plates may be made of Steel or of any other suitable material.
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
The application of one or more dished disks provided with corrugations for
simultaneously keeping one or more packing rings tight against the cylinder walls
and the piston cover or covers substantially for the purpose and in the manner
herein before described.