Improvements in Pistons.
Year: 1889

page_text: Date of Application, 13th Feb., 1889
Complete Specification Left, 12th Nov., 1889-Accepted, 14th Dec., 1889
PROVISIONAL OF MOITATION.
Improvements in Pistons.
Wo THOMAS WILLIAM SCOTT of 7 Elverson Road Deptford, Carpenter and
FREDERICK ABBOTT DURNFORD of 39 Harvard Road Lewisham Plasterer do
hereby declare the nature of our invention for IMPROVEMENTS IN PISTONS to
be as follows :-
The invention consists of a circular plate, being screwed, bolted, riveted or cast
upon the surface of an ordinary piston, the said plate to be of proper thickness, and
to be perforated with taper or conical holes, the side of plate with holes of greatest
area, being placed next to ordinary piston; so that the steam, gaseous, or other
vapours play on the back of perforated plate, vapours at the same time pass through
the smaller holes at top of plate, and press over the whole area of bottom of taper or
conical holes, thereby increasing the pressure area.
T. W. SCOTT.
F. A. DURNFORD.
COMPLETE SPECIFICATION.
Improvements in Pistons.
THOMAS WILLIAM SCOTT of 6 St. John's Terrace, Avenue Road Lewisham,
Carpenter FREDERICK ABBOTT DURNFORD of 39 Harvard Road Lewisham Plasterer
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 :-
The invention consists of a circular plate, being screwed bolted riveted or cast upon
the surface of an ordinary piston, the said plate to be of proper thickness, and to be
perforated with taper or conical holes, the side of plate with holes of greater area,
being placed next to ordinary piston, so that the steam, gaseous, or other vapours
play on the back of perforated plate, vapours at the same time pass through the smaller
holes at the top of plate and press over the whole area of bottom of taper or conical
holes, thereby increasing the pressure area.
See drawing, A B.
A ordinary piston.
B perforated plate.
It is obvious that rings, made so that a section of a ring, would form a wedge, and
made to nearly fit one within the other, with the thin portion of the ring, screwed or
fastened next the piston, which will have the same effect.
Inverted cones can also be screwed to piston, with apex of cones next to piston.
It will be seen that as the steam, gaseous, or other vapours passing through a
pipe of any given diameter (under pressure) into a pipe of larger diameter the steam
gas or other vapours will expand, and should the end of larger pipe be pluged, the
pressure will be exerted over the whole area of diameter of plug of larger pipe, it is
by these laws we increase the steam bearing area of a piston without increasing the
diameter of bore of cylinder.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
(1) Plate with conical or taper holes attached to piston substantially as herein before
described
B perforated plate.
It is obvious that rings, made so that a section of a ring, would form a wedge, and
made to nearly fit one within the other, with the thin portion of the ring, screwed or
fastened next the piston, which will have the same effect.
Inverted cones can also be screwed to piston, with apex of cones next to piston.
It will be seen that as the steam, gaseous, or other vapours passing through a
pipe of any given diameter (under pressure) into a pipe of larger diameter the steam
gas or other vapours will expand, and should the end of larger pipe be pluged, the
pressure will be exerted over the whole area of diameter of plug of larger pipe, it is
by these laws we increase the steam bearing area of a piston without increasing the
diameter of bore of cylinder.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
(1) Plate with conical or taper holes attached to piston substantially as herein before

page_text: (2) Also wedge shaped rings substantially and for the purpose herein before
described.
*
(3) Cones attached to piston substantially and for the purpose herein before
described.
Dated this 12th day of November 1889.
THOMAS WILLIAM SCOTT.
FREDERICK ABBOTT DURNFORD.