IMPROVEMENTS IN ENGINES TO
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
We JAMES JOHN MILLER, and GERALD JOHN TUPP, both of Creek Works,
Hammersmith in the County of Middlesex, Engineers and Boat Builders, do
hereby declare the nature of said invention for "IMPROVEMENTS IN ENGINES TO
" to be as follows:-
BE WORKED BY STEAM OR OTHER ACTUATING FLUID
In an engine according to this invention the piston is of the block form and has
a strong pin well fitted or fixed radially in it so as to project a short distance from
its periphery the projection being arranged to work in a crank disc as described
below, for which purpose it is advantageous to arm it with a ball of hard metal
such as steel. There is at the side of the cylinder an opening into a chamber that
may be cylindrical, with its axis at right angles to that of the cylinder. This
chamber we will call the crank disc chamber. It forms a jacket in which a crank
disc fixed on the end of the driving shaft, can rotate; this crank disc is provided
with a cylindrical hole parallel with, but eccentric to, the shaft; and into which
hole the before mentioned projection from the piston takes. Usually it will be
advantageous to bush this hole with hard steel. With this arrangement, as will be
evident, in order to enable the piston to reciprocate, the projection or ball must
follow the path described by the cylindrical hole in the crank disc, and to do this
the piston must make a partial rotation first one way and then the other during
each stroke.
Referring to the accompanying sheet of illustrative drawings, Figs 1 to 3,
shew an engine constructed according to our invention and having a direct acting
pump combined with it,-Fig 1 being a vertical section, Fig 2 an elevation at right
angles to Fig 1-and Fig 3 a cross section shewing the arrangement for admitting
steam to and exhausting it. from the cylinder.
A is the cylinder, B is the piston fitted radially with the strong pin C armed
with a hard steel ball D, taking into the bushed cylindrical hole E in the crank
disc F. G is the crank disc chamber within which the crank disc F works. H is
the driving shaft. The piston B is shewn provided with a plunger J attached to
one end of it, passing through stuffing boxes K K¹, and working in a pump
cylinder L.

page_text: '
In Fig 3, M M' are ports in the piston B leading to the front end of the piston.
N N' are similar ports leading to the back end of the piston. O is the actuating
fluid supply passage, and P the exhaust passage. It will be evident that as the
piston B has a reciprocating and partial rotary motion, the effect of the arrange-
ment will be to alternately admit actuating fluid to act on each end of the piston
whilst the cylinder at the other end will be open to the exhaust.
Fig 4 is a transverse section illustrating a modification of the arrangement just
described for admitting actuating fluid to and exhausting it from the respective
ends of the piston and Fig 5 is a vertical section of a portion of the same on the
line xx, but drawn to a smaller scale. In this case 00' are admission passages,
P is the exhaust passage, and the piston has in it two passages each serving
alternately for admission and exhaust, these being M leading to the front end of the
cylinder, and M₁ leading to the back end.

page_text: We JAMES JOHN MILLER, and GERALD JOHN TUPP, both of Creek Works,
Hammersmith, in the County of Middlesex, Engineers and Boat Builders, do
hereby declare the nature of our invention for "IMPROVEMENTS IN ENGINES TO
BE WORKED. BY STEAM OR OTHER ACTUATING FLUID," and in what manner the
same is to be performed to be particularly described and ascertained in and by.
the following statement:-
In an engine according to this invention the piston is of the block form and has
a strong pin well fitted or fixed radially in it so as to project a short distance from
its periphery, the projection being arranged to work in a crank disc or arm as
described below, for which purpose it is advantageous to arm it with a ball of hard
metal such as steel. There is at the side of the cylinder an opening into a chamber
that may be cylindrical, with its axis at right angles to that of the cylinder. This
chamber we will call the crank disc chamber. It forms a jacket in which a crank
disc or arm fixed on the end of the driving shaft can rotate; this crank disc is
provided with a cylindrical hole parallel with, but eccentric to, the shaft; and into
which hole the before mentioned projection from the piston takes. Usually it will
be advantageous to bush this hole with hard steel. With this arrangement, as will
be evident, in order to enable the piston to reciprocate, the projection or ball must
follow the path described by the cylindrical hole in the crank disc, and to do this
the piston must make a partial rotation first one way and then the other, during
each stroke.
Referring to the accompanying sheet of illustrative drawings Figs 1 to 3 shew
an engine constructed according to our invention, and having a direct acting pump
combined with it,-Fig 1 being a vertical section, Fig 2 an elevation at right angles
to Fig 1, and Fig 3 a cross section shewing the arrangement for admitting steam to
and exhausting it from the cylinder.
A is the cylinder, B is the piston fitted radially with the strong pin C armed
with a hard steel ball D taking into the bushed cylindrical hole E in the crank
disc F. G is the crank disc chamber within which the crank disc F works. H is
the driving shaft. The piston B is shewn provided with a plunger J attached
to one end of it passing through stuffing boxes K K³, and working in a pump
cylinder L.
In Fig 3 M M¹ are ports in the piston B leading to the front end of the piston.
N N¹ are similar ports leading to the back end of the piston. O is the actuating
fluid supply passage, and P the exhaust passage. It will be evident that as the
piston B has a reciprocating and partial rotary motion, the effect of the arrangement
will be to alternately admit actuating fluid to act on each end of the piston whilst
the cylinder at the other end will be open to the exhaust.
Fig 4 is a transverse section illustrating a modification of the arrangement just
described for admitting actuating fluid to and exhausting it from the respective
ends of the piston, and Fig 5 is a vertical section of a portion of the same on the
line xx but drawn to a smaller scale-In this case 00₁ are admission passages,
P is the exhaust passage, and the piston has in it two passages each serving
alternately for admission and exhaust, these being M leading to the front end of
the cylinder, and M¹ leading to the back end.

page_text: .
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:-
1. In an engine worked by fluid pressure causing rotary motion of the shaft and
partial rotary motion alternately in opposite directions of the piston by means of
a pin fixed radially in the piston so as to project from its periphery and working
in a crank disc or arm fixed on the end of the shaft substantially as described.
2. The improved engine described with reference to and illustrated in Figs 1,
2 and 3 or modified as shewn in Figs 4 and 5 of the drawings.
1001