An Engine Worked by Vapour and Compressed Gas.
Year: 1891

page_text: Complete Specification Left, 10th June, 1892-Accepted, 23rd July, 1892
PROVISIONAL SPECIFICATION..
An Engine Worked by Vapour and Compressed Gas.
I, ERNEST ALBERT TANCREDE BOVAGNET, of Pont de Beauvoisin, (Savoie),
in the Republic of France, Engineer, do hereby declare the nature of this inven-
tion to be as follows :-
The engine which forms the object of the present application is intended to work
with compressed gases and vapour, it is shown in detail in the annexed drawings to
which the following refers. In the drawings Figure 1 is a longitudinal section
along the axis of the engine and Figure 2 is a transverse section on the line 1-2
Figure 1.
The machine thus shown is made up of the following parts:
1. A cylinder A, having slightly rounded corners and closed by covers C and C¹
which are pierced at the centre with circular holes provided with stuffing boxes c
and c'.
2. A shaft B running from end to end of the cylinder A along its axis and
passing out through the stuffing boxes c and c.
3. A part D through which passes the shaft B and firmly rivetted or keyed to
it. This part D is divided into two portions one formed of a pallet d of more or
less trapezoidal section, and the other of two segments d' and d uniting at the shaft
and touching at their chord. These segments are of circular, elliptic or other shape.
When they are circular, the two arcs put together form a double Gothic arch, of
the same radius as the cylinder and have their centres upon the same diameter
of it, in such a manner that the arc d' d encloses or does not enclose the shaft B.
In all cases it is expedient to leave round the shaft a thickness of metal of sufficient
strength to withstand the strain on the pallet d caused by the vapour or compressed
gases. The piece D however is independent of the cylinder and can turn freely in
the interior of it.
•
The fit of the piece D is obtained by means of packing pieces or metallic bars o
pressed outwards by any kind of spring. These packing pieces extend all round
the shaft, B; they also run all round the pallet d and the opposite piece and
interlock each other. The number of these packing pieces is variable.
Vapour or compressed gases are introduced into the cylinder in any manner. In
particular slide valves, equilibrium or otherwise; double piston, cylindrical, Corliss
or any other system of valve actuated by eccentrics, cams &c. may be employed.
An arrangement of valves R and R' placed longitudinally upon the cylinder and
worked by bevel wheels E E E or any other convenient form may be used by
which the initial motion is taken from the shaft B.
These valves may be hollow and admit or let out vapour, according to the
direction of rotation, by the pipes rr. They are each furnished with a stuffing
box g g' and held by the screws h h'.
The movement is so arranged that at each turn of the shaft one side of the
pallet d is in direct communication with the generator of the motor fluid and the
other with the atmosphere or a condenser.

page_text: The introduction of the motor fluid may also take place by means of longitudinal
passages e and e' (Figures 3 and 4) formed in the shaft B. In this case one of the
passages is central or nearly so, whilst the other is near to the outer surface.
The first opens out on one side of the pallet d the second on the other side of this
pallet. One is used for the inlet and the other the outlet or vice versa.
Two parts P and P¹ each carrying two stuffing boxes p p and p' p' round the
shaft B, which in this case has in it two circular passages and f one com-
municating with the passage e and the other with the passage. The part P is
connected by the pipe t to the generator. The part P¹ is connected by the pipe t'
to the condenser or vice versa.
In this method of distribution the shaft B carries three sleeves m m² m² (fixed or
moveable) forged or otherwise and applied hot upon the said shaft in order to make
the connection perfect.
The same arrangement may be adopted on the other side of the cylinder in order
to move (if desired) the pallet in one direction or the other.
In arranging the valves on the pipes t and teach of the parts P and Pt may be
easily put in communication either with the generator or with the condenser. It is
sufficient to shut the open valves and open those which are shut in order to reverse
the direction of motion.
B
These valves may be worked by one movement.
It is seen by the foregoing that my machine is a rotary engine which is caused
to turn by the difference of pressure exerted on the two surfaces of the movable
central piece D (the pallet d and the portion whose contour is a broken curve or
otherwise). Rotation takes place in one direction or the other according as the
gaseous fluid is introduced on one side or the other of the pallet.
To set this motor in motion, I arrange on the cylinder two valves i and i¹, making
with the usual admission valve R an isosceles triangle, which allows of obtaining
rotation in the desired direction. A stem on the shaft B shows at the exterior the
position of the pallet d in the interior which allows of the opening of the one or
other starting valve.
-
•
This motor may be built in any size, and any metal may be employed in its
construction..
"Dated this 10th day of September 1891.
CARPMAEL & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
An Engine Worked by Vapour and Compressed Gas.
1. ERNEST ALBERT TANCRÈDE BOVAGNET, of Pont de Beauvoisin (Savoie),
in the Republic of France, Engineer, do hereby declare the nature of this inven
tion and in what manner the same is to be performed to be particularly described
and ascertained in and by the-following statement :-
"The engine which forms the object of the present application is intended to work
with compressed gases and vapour, it is shewn in detail in the drawings left with
the Provisional Specification to which the following refers. In the drawings
Figure 1 is a longitudinal section along the axis of the engine and Figure 2 is a
transverse section on the line 1-2 Figure 1. The machine thus shewn is made up
of the following parts :-
:-
1. A cylinder A, having slightly rounded corners and closed by covers C and C¹
which are pierced at the centre with circular holes provided with stuffing boxes o
and c'.
2. A shaft B running from end to end of the cylinder A along its axis. and
passing out through the stuffing boxes e and o'.
3. A part D through which passes the shaft Band firmly rivetted or-keyed to it.
This part D is divided into two portions one formed of a pallet d of more or less

page_text: trapezoidal section, and the other of two segments d' and d uniting at the shaft
and touching at their chord. These segments are of circular, elliptic or other
shape. When they are circular, the two arcs put together form a double Gothic
arch, of the same radius as the cylinder and have their centres upon the same
diameter of it, in such a manner that the arc d'encloses or does not enclose
the shaft B. In all cases it is expedient to leave round the shaft a thickness of
metal of aufficient strength to withstand the strain on the pallet caused by the
vapour or compressed gases. The piece D however is independent of the cylinder
and can turn freely in the interior of it.
.j
The fit of the piece D is obtained by means of packing pieces or metallic bars o
pressed outwards by any kind of spring. These packing pieces extend all round
the shaft B; they also run all round the pallet d and the opposite piece and inter-
lock each other. The number of these packing pieces is variable.
Vapour or compressed gases are introduced into the cylinder in any manner. In
particular slide valves, equilibrium or otherwise, double piston, cylindrical, Corliss
or any other system of valve actuated by eccentrics, cams &c. may be employed.
An arrangement of valves R and R' placed longitudinally upon the cylinder and
worked by bevel wheels E E' E or any other convenient form may be used by
which the initial motion is taken from the shaft B.
These valves may be hollow and admit or let out vapour, according to the
direction of rotation, by the pipes. They are each furnished with a stuffing
box g g¹ and held by the screws h h¹.
The movement is so arranged that at each turn of the shaft one side of the
pallet d is in direct communication with the generator of the motor fluid and the
other with the atmosphere or a condenser.
The introduction of the motor fluid may also take place by means of longitudinal
passages, e'andel (Figures 3 and 4) formed in the shaft B. In this case one of
the passages is central or nearly so, whilst the other e¹ is near to the outer
surface. The first opens out on one side of the pallet d the second on the other
side of this pallet. One is used for the inlet and the other the outlet or vice versa.
Two parts P and P' each carrying two stuffing boxes p p and p¹ p¹ round the
shaft B, which in this case has in it two circular passages fand one communicating
with the passage e and the other with the passage e. The part P is connected by
the pipe to the generator. The part P¹ is connected by the pipe t¹ to the
condenser or vice versa.
In this method of distribution the shaft B carries three sleeves m m³ m³ (fixed or
moveable) forged or otherwise and applied hot upon the said shaft in order to make
the connection perfect.
The same arrangement may be adopted on the other side of the cylinder in order
to move (if desired) the pallet in one direction or the other.
In arranging the valves on the pipes t and t' each of the parts P and P¹ may be
easily put in communication either with the generator or with the condenser. It
is sufficient to shut the open valves and open those which are shut in order to
reverse the direction of motion.
These valves may be worked by one movement.
It is seen by the foregoing that my machine is a rotary engine which is caused
to turn by the difference of pressure exerted on the two surfaces of the moveable
central piece D (the pallet d and the portion whose contour is a broken curve or
otherwise). Rotation takes place in one direction or the other according as the
gaseous fluid is introduced on one side or the other of the pallet.
To set this motor in motion, I arrange on the cylinder two valves i and iª, making
with the usual admission valve R an isosceles triangle, which allows of obtaining
rotation in the desired direction. A stem on the shaft B shews at the exterior
the position of the pallet d in the interior which allows of the opening of the one
or other starting valve.
This motor may be built in any size, and any metal may be employed in its
construction.

page_text: 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 :-
1. A motor consisting of a cylinder furnished with admission and exit passages
for the fluid to actuate the motor and with an axis passing through the cylinder
concentrically such axis carrying a pallet fitting to the walls of the cylinder and
furnished with curved segments so arranged that on one side of the axis the pallet
is exposed to the fluid pressure and on the other side is sheltered therefrom by the
curved segments.
2. The motor consisting of the cylinder A in which plays a pallet d of trapezoidal
form secured to a part D formed of two circular or other segments and the
said part D being provided with packing pieces o and keyed on the shaft B, passing
through the stuffing boxes ce and working inlet and outlet arrangements all
working in the manner described with regard to Figures 1 and 2 of the annexed
drawings.
3. In this motor the special arrangement of valves R and R¹ for the inlet and
outlet of the vapour, the said valves being directly actuated by the motor shaft B
as has been described
and working in combination with the starting cocks i and
with reference to the annexed drawings.
4. In this motor and as a variation in the inlet and outlet of the gaseous fluid;
the arrangement of the shaft B with two grooves e and working in com-
bination with the pieces P and P' and stuffing boxes p p and p'p' in the manner
described with regard to Figures 3 and 4 of the annexed drawings.
Dated this 10th day June 1892.