Year: 1887

page_text: Date of Application, 15th Jan., 1887
Complete Left, 29th Sept., 1887
Complete Accepted, 1st Nov., 1887
I, ACHILLE BOULOUSE, of 31 Rue St. Andre, Rouen (Seine Inférieuro) in the
Republic of Franco, Merchant, do hereby declare the nature of this invention to be
as follows:-
This invention relates to an air valve for heating apparatus arranged in combination
with a pyrometer so as to open and close automatically according to variations of
temperature. A convenient form of valve is that known as a ventilator valve either
rectangular or circular consisting of a plate or disc with holes through it sliding or
turning on the face of another plate or disc with corresponding holes, the valve being
more or less open according as the two sets of holes are more or less in coincidence.
To such a valve I apply a pyrometer which may be a circularly bent spring consisting
of two metals having different degrees of expansion when heated. One end of this
spring being fixed, and the other end being connected to the sliding plate or the
turning disc, the variations of temperature to which the spring is subjected cause its
free end to move so as to open or close more or less the valve. It is sometimes
convenient to set the valve in a certain position holding it to a certain extent open
until the temperature reaches a given point. This I effect by applying a stop acting
like a pawl on a ratchet, rack or segment of the valve and holding it until the pyrometer
moves it in the direction permitted by the pawl. Instead of employing a bent spring
of combined metals as a pyrometer, a piston or flexible diaphragm acted on by the
expansion and contraction of a fluid may be connected to the valve to operato in a
similar manner.
Dated this 15th dow of Jann 1887
ABEL & IMRAY,
Agents for the Applicant.

page_text: I, ACHILLE BOULOUSE of 31 Rue St. Andre Rouen (Seine Inférieure) in the
Republic of France, Merchant, 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 :-
This invention relates to an air valve for heating apparatus arranged in combination
with a pyrometer so as to open and close automatically according to variations of
temperature. A convenient form of valve is that known as a ventilator valve, either
rectangular or circular, consisting of a plate or disc with holes through it, sliding or
turning on the face of another plate or disc with corresponding holes, the valve being
more or less open according as the two sets of holes are more or less in coincidence.
To such a valve I apply a pyrometer which may be a circularly bent spring consisting
of two metals having different degrees of expansion when heated. One end of this
spring being fixed, and the other end being connected to the sliding plate or the
turning disc, the variations of temperature to which the spring is subjected cause its
free end to move so as to open or close more or less the valve.
It is sometimes convenient to set the valve in a certain position, holding it to a
certain extent open until the temperature reaches a given point. This I effect by
applying a stop acting like a pawl on a ratchet, rack or segment of the valve and
holding it until the pyrometer moves it in the direction permitted by the pawl and this
may then be made to spring back so as to leave the valve free to be moved in either
direction. Instead of employing a bent spring of combined metals as a pyrometer, a
piston or flexible diaphragm acted on by the expansion and contraction of a fluid may
be connected to the valve to operate in a similar manner.
Figs. 1 and 2 of the accompanying drawings shew the invention applied to an air
valve of rectangular shape Fig. 1 being an outer view and Fig. 2 an inner view of
the same.
a is the sliding part of the valve, this and the fixed part being formed with
hit-and-miss openings in the well known manner; bede is the pyrometer spring which
may either bo hollow and filled with a fluid like the tube of a Bourdous gauge, or it
may be formed of two strips of different metals having unequal expansion. It is fixed
at b and has its free end e connected by a link ef to the one end of a double ended
lever 9, pivotted to a fixed bracket, the other end of which is connected by a link / to
the valve a so that as the spring bede is made to open out more or less by the action
of the heat, it causes the lever g to move valve a so as to close the openings more
or less.
Figs. 3 and 4 shew a circular hit-and-miss valve with the invention applied to it,
Fig. 3 shewing the front view and Fig. 4 the inner view, in this case the pyrometer
spring b c d e effects the partial rotation of the moveable part a through the link ef

page_text: and lover g the end of the latter being connected by a slot and pin i. is a sliding
stop which can be made to bear against the edge of the valve so as to maintain this in
a partially open position, when required, on starting.
This may however be dispensed with, though owing to the bad conductibility of the
air, the opening of the valve would be somewhat retarded without the above arrangement.
Having thus particularly described and ascertained the nature of this invention and
in what manner the same is to be performed I declare that what I claim is :-
The use of automatically opening and closing air valves wherein a pyrometer spring,
so formed as to move in one direction or the other according to the degree of heat to
which it is subjected, is connected to the moveable part of the valve so as to effect the
opening or closing thereof according to the temperature of the air passing through,
substantially as herein described.