Improvements in or relating to Packing Rings for Pistons and the like.
Year: 1889

page_text: Date of Application, 5th June, 1889
Complete Specification Left, 5th Mar., 1890-Accepted, 5th Apr., 1890
PROVISIONAL SPECIFICATION.
Improvements in or relating to Packing Rings for Pistons and the
like.
I, MARMADUKE HUSBANDS, of Church Street, Stapleford, in the County of
Nottingham, Engine Driver, do hereby declare the nature of this invention to be as
follows:-
This invention relates to the arrangement of metallic packing in pistons and the like
and it has for its object the improved arrangement of such packing.
In carrying out this invention in a recess formed round the piston I place two
expanding rings bevelled on their inner faces; these rings are forced open by two
inner rings sliding in the recess with an outer bevelled part bearing on the inner bevel
of the outer expanding rings. The inner rings are also provided with a bevelled inner
surface forming a V groove between them.
Lying in this groove is an endless spring preferably spiral in form which by its
contraction forces the two inner rings apart and the expanding rings outwards.
The piston is preferably formed with one of its flanges removable and adjustable, so
that the rings may be placed in the recess. The pressure may also be adjusted by the
flange and the rings expanded after placing them on the cylinder.
The expanding rings are preferably formed with a projection on the free end fitting
into a recess formed in the other, the projection and recess being preferably formed
parallel to the bevelled part.
Dated this 5th day of June 1889.
W. P. THOMPSON & BOULT,
Agents.
COMPLETE SPECIFICATION.
Improvements in or relating to Packing Rings for Pistons and the
like.
I, MARMADUKE HUSBANDS of Church Street, Stapleford, in the County of
Nottingham, Engine Driver, 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 the arrangement of metallic packing in pistons and the like
and it has for its object the improved arrangement of such packing.
It will be best understood by reference to the accompanying drawings in which
Fig. 1 is a vertical section of a piston, Fig. 2 is a side elevation with parts of the
outer rings removed, Fig. 3 is a segment of one of the outer rings Fig. 4 is a
transverse section of the same and fig. 5 is a transverse section of one of the
rings C.
In carrying out this invention in the recess formed round the piston A I place two
outer expanding rings B bevelled on their inner faces b fig. 4 and formed with their free
ends overlapping in the ordinary manner, or with a projection on one free end fitting
into a recess in its other end, the projection and recess being formed preferably
parallel to the bevelled part. These rings B are expanded by the action of two inner
rings C sliding in the recess and each formed with an outer bevelled surface c fig. 5
bearing on the inner bevel of the expanding rings B; the inner rings C are also
provided each with a bevelled inner surface c¹ which together form a V groove
between them.
In the groove formed by the two rings C is an endless and preferably spiral
spring D with its two ends united which by its contraction forces the two inner
D

page_text: rings C apart and by the action of their outer bevelled surfaces cause the two outer
rings B to expand and maintains them in liquid tight contact with the sides of the
cylinder.
The piston A is preferably formed with a removable and adjustable end flange or
ring E which may be secured and adjusted by means of screws or bolts F so that the
inner rings C may be placed in the recess. The pressure may be also adjusted by the
flange E and the rings expanded after placing the piston in the cylinder.
To give the expanding rings B more elasticity radial cuts or openings G see fig. 3
may be formed on their inner and bevelled surfaces and in some cases the inner
ring C may be formed in segments so as to be better adapted to take up unequal wear
in the rings B or the cylinder.
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 piston or the like the employment of a ring such as C having outer and
inner bevelled surfaces such as c c substantially as and for the purpose described and
illustrated in the accompanying drawings.
2. In a piston or the like the combination with the outer expanding rings B of
rings such as C provided with inner and outer bevelled surfaces such as c c¹ sub-
stantially as and for the purpose described and illustrated in the accompanying
drawings.
3. In a piston or the like the combination with rings such as C provided with inner
and outer bevelled surfaces such as c c of a spring such as D substantially as
described and illustrated in the accompanying drawings.
4. In a piston ring having an inclined face such as the employment of radial cuts
or openings such as G substantially as and for the purpose described and illustrated
in figures 3 and 4 of the accompanying drawings.
5. The combination and arrangement of parts forming the complete packing for
pistons and the like substantially as herein described and illustrated in figures 1 and 2
of the accompanying drawings.
Dated thin 1at dove of Monah 1900
MARMADUKE HUSBANDS.