Year: 1898

page_text: A communication from HENRI CHAUDUN, of 93, Rue Richelieu, Paris, in the
Republic of France, Engineer.
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention to be as
follows:-
The present invention relates to certain improvements in the apparatus forming
the subject of prior Patent No. 15354 dated the 26th June 1897.
These improvements consist essentially in the arrangement of parts, the special
object of which is the balancing of the motor, as much in respect of its parts as
of the distribution of the motive power or efforts in such a manner that the latter
are equally and simultaneously exerted on the two shafts and that the vibrations
or jarring caused by the effect of centrifugal force upon the rotating parts are
neutralised.
The improved motor consists in the combination of three groups of sectors, the
respective arrangement and combination of which is similar to that of the sectors
described in the before mentioned specification but having the advantage that
these three groups of sectors keyed on their respective shafts are perfectly balanced.
The perfect balance is realized in the following manner.
The sectors of the central group are keyed in diametrically opposite positions in
relation to the sectors and of the side groups, and their effective area is equal to
the sum of the effective areas of the side sectors, whereby an even distribution of
the motive efforts is effected simultaneously on the two shafts. It will be under-
stood that in consequence of this arrangement the whole of the weight of the side
sectors is balanced by the weight or mass of the central sectors and that the side
sectors in the example under consideration being arranged symmetrically i.e. at
equal distances on either side of the central sectors perfect balance is obtained no
matter what the speed of rotation may be. Balance might also be obtained if the
side sectors were not in positions of lateral symmetry with regard to the central
Fectors, but in such a case it would be necessary, in order to obtain balance, to
make the weights of the opposed masses i.e the side sectors respectively inversely
proportional to their distances from the central sectors.
Thus, by way of example, the lateral distance X of the one pair of the side
sectors in relation to the central sectors may be double that of the distance X¹
of the other pair of side sectors in relation to the same central sectors. Under
these conditions in order to attain perfect equilibrium it is necessary that whilst
the total weight or mass of the side sectors must remain equal to the weight of
the central sectors, the respective weights of the side sectors should be propor-
tional so that in the case of the nearer sectors it should be double that of the
further sector, i.e., the respective weights of the masses of the sectors should be
inversely proportional to their respective lateral distances in relation to the
antral sectors

page_text: This is explained with a view to showing that whilst preserving the essential
feature of this invention it may not be always possible to attain an exact arrange-
ment of equality of the masses of the side sectors and of the lateral distance of
the said sectors from the central sector and at the same time to obtain the con-
ditions of balance which it is sought to realise. It may in fact be necessary in
certain cases (for instance when working with compression, or as a compound
engine when it is desired to vary the amount of compression or expansion) to
combine the side sectors at different lateral distances in relation to the central
sectors and of different weights while retaining the central conditions of balance.
'Such a combined motor comprises accessories for instance: admission valves,
ignition tube exhaust ports and pipes.
In an arrangement of combined motor for working with compression the suction
of the charge may be effected through pipes by the side sectors which drive and
compress this charge in and through pipes through the inlet valve, to the central
sectors between which the explosion is effected, the exhaust gases escaping through
a suitable pipe.
In an arrangement of combined motor for a compression and compound working
one of the pair of side sectors drawing in the explosive charge through a pipe
may force and compress the charge through a pipe in between the other pair of
side sectors which then rotate the exhaust burnt gases escaping by a pipe and
being conducted between the central sectors where they expand. this expansion
producing a driving action which reinforces that of the driving side sectors with-
out prejudice to the conditions of balance of the motor.
In an arrangement of motor without compression the group of side sectors
may have their driving functions neutralized or lessened either separately or
together in order to reduce the driving force of the motor and in consequence the
consumption of charge and expense, by an arrangement of cocks which, inter-
capting the arrival of the charge, establish communication with the atmosphere
thus effecting between the sectors to which they respectively correspond a simple
circulation of air without any action of compression prejudicial to the driving
action produced by those driving sectors which are still in action.
Th: 1511. JT... 100o
BOULT & WADE,
Agents for the Applicant.
A communication from HENRI CHAUDUN, of 93, Rue Richelieu, Paris, in the
Republic of France, Engineer.
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
The present invention relates to certain improvements in the apparatus forming
the subject of prior Patent No. 15354 dated the 26th June 1897.
These improvements which are represented by way of example in the accom-
panying drawings consist essentially in the arrangement of parts the special object
of which is the balancing of the motor, as much in respect of its parts as of the
distribution of the motive power or efforts in such a manner that the latter are
equally and simultaneously exerted on the two shafts and that the vibrations or

page_text: neutralised.
In the accompanying drawings-
Figure 1 is a side elevation of the general arrangement of the improved motor.
Figure 2 is an end elevation.
Figure is a longitudinal vertical section.
Figure 4 is a cross-section.
Figures 5, 6 and 7 are modifications.
On examining these figures and more particularly Figure 3 it will be seen that
the motor consists of three groups of sectors ABC the respective arrangement
and combination of which is similar to that of the sectors described in the before
mentioned specification, but having the advantage that these three groups of
sectors keyed on their respective shafts PP" are perfectly balanced.
In the example shown the perfect balance is realized in the following
manner-
The sectors B of the central group are keyed in diametrically opposite positions
in relation to the sectors A and C of the side groups, and their effective area is
equal to the sum of the effective areas of the side sectors AC whereby an even
distribution of the motive efforts is effected simultaneously on the two shafts PP¹.
It will be understood that in consequence of this arrangement the whole of the
weight of the side sectors A and C is balanced by the weight or mass of the cen-
tral sectors B and that in the example shown in Figure 3 the side sectors A and C
being arranged symmetrically, i.e. at equal distances on either side of the central
sectors B, perfect balance obtained no matter what the speed of rotation may be.
Balance might also be obtained if the side sectors A and C were not in posi-
tions of lateral symmetry with regard to the central sectors B, but in such a case
it would be necessary, in order to obtain balance, to make the weights of the
opposed masses i.e. the side sectors A and C respectively inversely proportional to
their distances from the central sectors B.
Thus by way of example an arrangement is shown in Figure 5 in which the
lateral distance X of the sectors C in relation to the central sectors B is double
that of the distance X' of the sectors A in relation to the same central sectors B.
Under these conditions in order to attain perfect equilibrium it is necessary that
whilst the total weight or mass of the side sectors A and C must remain equal to
that of the central sectors B, the respective weights of the side sectors A and C
should be proportional, so that in the case of the nearer sectors A it should be
double that of the further sectors C, i.e. the respective weights of the masses of
the sectors A and C should be inversely proportional to their respective lateral
distances in relation to the central sectors B.
This is explained with a view to showing that whilst preserving the essential
feature of this invention it may not be always possible to attain an exact arrange-
ment of equality of the masses of the side sectors A and C and of the lateral dis-
tance of the said sectors A and C from the central sectors B and at the same time
to obtain the conditions of balance, which it is sought to realize. It may in fact
be necessary in certain cases (for instance when working with compression, or as a
compound engine, when it is desired to vary the amount of compression or expan-
sion) to combine the side sectors A and C at different lateral distances in relation
to the central sectors B and of different weights while retaining the essential
conditions of balance. Such a combined motor comprises the usual accessories for
instance-admission valves D, ignition-tube E, exhaust ports and pipes F.
In Figure 6 an arrangement of combined motor for working with compression
is shown diagramatically.
The suction of the charge is effected through pipes HH' by the side sectors A
and C which drive and compress this charge in and through pipes II' through
the inlet valve J to the central sectors B between which the explosion is effected,
the exhaust gases escaping through a pipe J¹,

page_text: In Figure
an arrangement of combined motor for a compression and com-
pound working is shown diagramatically.
One of the pair of side sectors A drawing in the explosive charge through a
pipe K may force and compress the charge through a pipe L in between the other
pair of side sectors C which then rotate; the gases escaping by a pipe M and
being conducted between the central sectors B where they expand, this expansion
producing a driving action which reinforces that of the driving side sectors C
without prejudice to the conditions of balance of the motor.
In the arrangement of motor without compression shewn in Figures 1, 2, 3, 4,
the groups of side sectors A and C may have their driving functions lessened or
neutralized either separately, or together in order to reduce the driving force of
the motor and in consequence the consumption of charge by an arrangement of
cocks TT, which, intercepting the arrival of the charge, establish communication
with the atmosphere, thus effecting between the sectors to which they are respec-
tively applied a simple circulation of air without any action of compression pre-
judicial to the driving action produced by those driving sectors which are still in
action.
Having now particularly described and ascertained the nature of the said
invention, as communicated to me by my foreign correspondent, and in what
manner the same is to be performed, I declare that what I claim is:-
1. A rotary motor comprising a series of interacting sectors upon two parallel
shafts, the central sectors being arranged in diametrically opposite positions as
regards the side sections and having an acting surface equal to the sum of that of
the side sectors, the combined weight of which equals that of the central sectors,
substantially as and for the purpose described.
2. A rotary motor of the kind described in which the side sectors are at different
distances from the central sectors, the acting surfaces and weights of the two sets
of side sectors differing inversely to their distance from the central sectors, sub-
stantially as described.
3. The complete rotary motor substantially as described or illustrated in the
accompanying drawings.
Dated this 10th day of March 1899.
BOULT & WADE,
Agents for the Applicant.