DE71548C - Shuttle valve for mechanically playable keyboard instruments - Google Patents

Description

IMPERIAL

PATENT OFFICE.

The invention described below relates to the shuttle valves through which In the case of pneumatic keyboard instruments, the key bellows alternate with the suction channel and the outside air. The novelty of the present subject lies in the fact that a membrane is formed with the shuttle valve lever, which is mounted in a peculiar way is related, on the one hand by air dilution, on the other hand by air compression is set in motion at certain times and transmits this motion to the valve lever, so that it thereby Switching is effected.

The valve housing α is arranged between the key bellows housing d and the music sheet housing g in such a way that it can be pulled out towards the front if the valve needs to be repaired. Erdem on the housing by a α b ^l and b ² with channels provided Horizontal wall b in the lower actual valve chamber and a ^l in a different, associated with the Saugebälgen space divided, defined by a small. Opening c ¹ provided membrane c is again divided into two divisions a ² a ³ . In the space α ¹ , which is connected to the key bellows d ' ² by the channel d ¹ , the shuttle valve lever e is located at an angle e ¹ , which in the rest position closes the channel b' ² under the influence of the leaf spring e ² and during this the channel b ^{1 runs} in free connection with the room a ¹ and the key bellows, so that they are filled with air during this time and the pusher f connected to them is respectively in its lower position. Is in rest position.

In the upper housing g , when the instrument is played, the music sheet g ^{1 is} pulled away via a so-called pull rod g ³ provided with channels g ² by turning a crank which simultaneously sets the suction bellows in motion, so that the shorter ones contained in the music sheet or longer perforations either close one or the other part of the ducts g ² outwards or leave them open for a longer or lesser time, so that during this time the upper space a ^{s of} the valve housing α communicates with the air under normal pressure in the housing g is brought.

As well as this connection occurs in a valve housing '; the membrane c is moved downwards by the pressure suddenly acting from above, whereby it ^{flips the valve lever e through its action on the pressure pin e 3} , and now the outside air duct b ^{l is} closed and the suction air duct b ^{2 is} connected to the key bellows. The air contained in these bellows is immediately sucked off, which causes the lower movable floors to be raised and thus also the push rod f to be raised, which in a known manner results in the key being struck.

If the relevant channel g ^{2 is} now closed again, the opening c ^{1 of} the membrane c

lent air is sucked out again, so that the return to the rest position is ^{then automatically effected by the spring e 2.}

Particularly noteworthy in the valve arrangement is the way in which the lever e is supported, which enables it to be replaced or replaced as quickly and easily as possible. Removal of the lever in the event of a repair is effected.

As can be seen, at the angle e ^{1 there is} a pin e ⁱ which lies in a correspondingly shaped small groove in the middle, somewhat narrower part of the lever e; the hold of the lever e is effected by a metal plate e ⁵ which can be pressed by the screw e ^e against the upper surface of the central part of the lever e. If the housing α is pulled out, you can loosen the plate e ⁵ by turning the screw e ⁶ from below, so that you can first move the lever a little downwards and then forwards, with the pin e ^{4 then to} a certain extent under the Plate e ⁵ slides out so that the lever can then be removed freely.

Claims (1)

Patent Claims: Changeover valve for mechanically playable keyboard instruments, characterized by the connection of a changeover valve lever e, which keeps the suction air channel b ² closed at rest and the outside air channel b ^l open, with a lever e with a fine opening fc ^l ) arranged between the channel b ² and a drawbar channel fg ² ) membrane fc) which by means of a Stöfsers fe ³⁾ the switching of the shuttle valve lever fe) caused once by exposing the channel g ^2, the supervisor air into the room fa ³⁾ may occur above the membrane, followed by extraction of the Tastenbälge (cP) and raising the Stofsstange ff) enters. The storage of the under ι. marked shuttle valve lever fe) in a bracket fe ¹ ) provided with a pin fe *) in such a way that the lever is held by. by means of a screw fe ⁶ ) tightenable or detachable plate fe ⁵ ) which presses the pin fe ⁴ ') into a corresponding groove of the lever fe) . For this purpose ι sheet of drawings.