Improvements in Pistons.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Pistons.
We, JOSEPH POLLIT, and EUSTACE WIGZELL, of the Firm of Pollit & Wigzell
Limited, Engineers, Bank Foundry, Sowerby Bridge, in the County of York do hereby
declare the nature of this invention to be as follows:-
Our improved piston we make in the following manner :-
In between the flange of the piston and the junk ring, we have a ring or rings
made cone shaped on the inside, tapering towards the centre, and split. In the recess
between the flange of the piston and the junk ring we have a space, sufficiently deep
to take two rings, solid, tapering on the top side towards the centre, so as to correspond
with the taper of the outer ring or rings. These two rings fit the body of the piston.
In the flange of the piston and the junk ring we have holes, of sufficient size to take
spiral springs, and so arranged that the spiral springs press on the outside of the
bevelled or tapered rings, pushing these rings towards each other, and against the
corresponding taper or cone in the outer ring or rings, opening the outer ring or rings,
and keeping them steam tight against the cylinder, also preventing the steam from
passing at the back of same, and assisting to take the weight of the piston in the case
of horizontal engines, and preventing the rings from working in between the piston
Hlange and the junk ring.
Dated this 17th day of March 1896.
JOSEPH POLLIT.
EUSTACE WIGZELL.
COMPLETE SPECIFICATION.
Improvements in Pistons.
We, JOSEPH POLLIT and EUSTACE WIGZELL, of the Firm of Pollit and Wigzell
Limited, Engineers, Bank Foundry, Sowerby Bridge, in the County of York, 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 :-
Our improved piston we make in the following manner :-
In between the flange of the piston and the junk ring, we have a ring or rings
made cone shaped on the inside, tapering towards the centre, and split. In the recess
between the flange of the piston and the junk ring we have a space, sufficiently deep
to take the two rings solid, tapering on the top side towards the centre, so as to
correspond with the taper of the outer ring or rings. These two rings fit the body
of the piston. In the flange of the piston and the junk ring we have holes, of
sufficient size to take spiral springs, and so arranged that the spiral springs press on
the outside of the bevelled or tapered rings, pushing these rings towards each other,
and against the corresponding taper or cone in the outer ring or rings, and keeping
them steam tight against the cylinder, also preventing the steam from passing at the

page_text: back of same, and assisting to take the weight of the piston in the case of horizontal
engines, and preventing the rings from working in between the piston flange and the
junk ring.
In the drawings annexed we show in Fig. 1 a part section, and in Fig. 2 a plan in
.section through B. B. Fig. 1.
In Fig. 1. A. is the body of the piston, E. the junk ring, C. the split ring or rings,
also shown C. in Fig. 2; with a groove G Fig. 1. running round the circumference.
The underside of the split ring C. is bevelled on the two outer inside edges tapering
towards the centre, H. H. with corresponding rings D. D. fitted on the body of the
piston A. with the outer circumference coned towards the centre.
Round the flange of the body of the piston which fits the cylinder, there are holes
drilled, with springs F. inserted, also shown F. in Fig. 2 with corresponding holes
with springs F. in the junk ring E. Fig. 1. These springs F. are in compression
pushing out the conical rings D. D. opening the split ring or rings C. outwards and
preventing the steam from passing underneath by means of the cones H. H.
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. The improved piston, substantially as described and shown in drawings.
2. In a piston, the use of an outer ring or rings having a groove or grooves round
the circumference, and bevelled on the two outer inside edges towards the centre,
substantially as described and shown in drawings.
3. In a piston, the use of two solid cone rings, fitting the body of the piston, having
cones on their outer circumference, corresponding to, or fitting, the cones on
the inside of the outer ring or rings, substantially as described & shown in
drawings.
4. In a piston, the use of springs round the flange of the body of the piston, and
springs round the inside of the junk ring, pressing the two solid cone rings together,
substantially as described and shown in drawings.
Dated this 19th day of November 1896.
E. E. WIGZELL,
Agent for Applicants.