DE213761C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

-M 213761 - CLASS 5id. GROUP

other row of bellows is pressed together.

Patented in the German Empire on August 21, 1908.

The present invention relates to a bellows arrangement as it is e.g. B. for pneumatic Musical instruments or playing devices for musical instruments are in use, and at of the two bellows or rows of bellows are coupled together so that at the same time the one is inflated and the other is compressed.

The essence of the invention is

ίο that at the same time the air chambers of these bellows are so connected that the one

■ The bellows is connected behind the other, so that it can only be connected by opening one controlling valve can act on the air chamber of the other, and that his Effect on the air chamber of the first bellows can be canceled in that its own air chamber is brought into contact with the outside air.

The purpose of the invention is to create a construction that is easy to manufacture, which ■ can be adjusted easily and quickly to changing power, depending on the requirements of the instrument.

Fig. Ι shows an embodiment of the new bellows arrangement and a drive motor for the same in side view, with individual parts broken away and others shown in section are.

Figure 2 is an end view of a pair of bellows with individual parts also broken away and others are shown in section.

The new bellows arrangement is shown in the drawing in the form of a twin bellows, i. H. in Shape of two pairs of bellows illustrated, with one bellows of each pair on each of the is arranged on both sides of a central support frame 1, which has a suction chamber forms. At the upper end of this frame posts 2 are attached, in which a Crankshaft 3 is supported by two cranks 4. The crankshaft can with the help of a Pulley 6 at its end and a belt 7 by means of a motor 8 which is on the drawing is indicated as an electric motor, are rotated. Each of the bellows 9 is at the free end of its movable cover plate with a protruding height Arm 10 equipped, the arms 10 of two opposing bellows by coupling rods 11 are connected to a crank 4 of the shaft 3, so that when inflated of one of two bellows belonging to a pair, the other bellows of the pair is collapsed. The moving ceiling of each bellows is equipped with a number of Openings 12 provided, which can be closed by an elastic valve 13, as is customary with bellows of the type in question. The solid cover plate of each bellows is provided with a series of openings 14 which lead to the wind chest. These openings 14 can be closed by an elastic plate valve 15,

Claims (2)

which is able to open towards the inside of the bellows. The wind chest is divided into two compartments 17 and 18 by a transverse wall 16. The transverse wall 16 is provided with a number of openings 19 which can be closed by an elastic plate valve 5 which can open towards the compartment 17. The bottom of the compartment 17 is provided with a series of openings 20 which can be closed by a valve 21 which has a series of through bores 22 which can be made to coincide with the channels 20. This valve can be moved or adjusted with the aid of a pull rod 23 so that the player can open or close the channels 20 at will. A suction tube 24 is connected to the chamber 18 of the suction tuyere, and this suction tube 24 is intended to be connected to the mechanism or the suction chambers from which the air is to be pumped out. The operation of the device is as follows: When a bellows is compressed, the air is forced out through the openings 12, while the bellows sucks air out of the suction chamber 1 through the channels 14 when it is inflated. When the valve 21 closes the ducts 20, both pairs of bellows are in the ready position, and the bellows of the chamber 18 evacuate the air which enters this chamber through the pipe 24, while the bellows of the chamber 17 somewhat from the air the chamber 18 through the openings 19. If less air is to be sucked in, e.g. B. when less force is required, the bellows of the chamber 17 are disabled by opening the channels 20 of the chamber 17 by adjusting the valve 21 accordingly, whereby the chamber 17 is placed in direct communication with the outside air, so that only outside air is sucked into the bellows of the chamber 17 and pressed out again. In this case, no air is sucked in from the chamber 18 through the bellows of the chamber 17, since the air pressure in the chamber 17 is always greater than the air pressure in the chamber 18, whereby the plate valve 5 keeps the channels rg permanently closed. The player is thus able to control the effectiveness of the bellows at any time and to regulate their suction power. Patent-A ν Proverbs: 1. Bellows arrangement, in which two Rows of bellows are coupled together so that at the same time one bellows of a row of bellows is inflated and the associated one the other row of bellows is pressed together, characterized in that the bellows of one row at will can be placed in connection with the outside air, whereby each bellows in one row is rendered ineffective. 2. bellows arrangement according to claim 1, characterized in that each of • two depending on each other, preferably set in motion by a crankshaft with power drive bellows (9) equipped with a valve mechanism ( ^τ 3> ^X 5) and one of two chambers (17, 18) is assigned with connecting channels (19), of which Chambers, one of which is connected to a suction pipe (24), while the other can be connected to the outside air through channels (20). 1 sheet of drawings.