the bellows, collapses the same, thereby relieving the pressure upon the
under side of the valve 5, and as the bellows falls it pulls down the valve 5
by means of the pin 9 against the air-pressure in chamber 11 and against
the weak pressure of the spring 6, and the air from the auxiliary chest 11
will then enter into the main chest 12 through the open valve and to the
pipes of the organ. The opening of the valve 5 is therefore easy and
gradual and by no means abrupt or violent, and when the pressure upon
the key 30 is relieved a reverse action takes place, namely: the spring 20
returns the valve 18 to its seat, closing the opening 19 and at the same time
opening the valve 17, allowing the opening below the valve 17 into the
bellows 13, and the pressure of the air in the bellows being equal to that in
the chest 11 the force of the spring 6 will return the valve 5 to its seat with
ease, and the air is thereby cut off from the organ-pipe.
In my device upon touching the key the valve 18 is opened, allowing the
air in the bellows 13 to escape, closing the valve 17, and the air rushing
out from the bellows the latter will collapse, and the pressure of the air in
the chest 11 upon the top of the bellows will tend to draw the valve 5 from
its seat, even against the pressure of the spring 6. The pressure, therefore,
upon the valve 5 is overcome, not by an equivalent pressure upon the key,
but through the escape of the air from the auxiliary bellows, which opens
the valve by the pin 9. It will thus be seen that the pull upon the valve is
positive whenever the key is pressed, and the valve will be opened
whether the bellows is tight or not. This pin 9, which connects the bellows
13 to the valve 5, is threaded above, so that it furnishes a means of
adjusting the connection between the bellows and valve, and this
adjustment may be made so delicate that a very slight pressure upon the
key will operate the auxiliary bellows and its valve mechanism and open
the main valve 5, admitting the air-blast to the organ-pipe.
What I claim as my invention, and desire to secure by Letters Patent, is the
following:
1. In an organ, an auxiliary air-chamber 11, located below the main valve
5, and an auxiliary bellows in such air-chamber, having openings in it
above and below, alternately closed and opened by the spring-
controlled valves 17 and 18, mounted on the rod 16, connected directly
to the key-controlled lever 23, substantially as shown and described.
2. In an organ, an auxiliary air-chamber provided with a bellows
connected to the main valve, such bellows having inlet and outlet
valves alternately opened and closed by pressure upon the key-lever,
the latter connected with the valve-rod of such bellows, whereby the
main valve 5 is positively opened by pressure upon the key,
substantially as shown and described.