JPS5913652Y2 - Rotary valve device for brass instruments - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rotary valve device for a brass instrument, which has a simple structure and can be easily assembled, repaired, etc., and can also be made lighter by reducing the number of parts.

BACKGROUND OF THE INVENTION Brass instruments such as horns have traditionally been equipped with a rotary valve that allows the length of the resonance tube to be switched in two stages to change the playing pitch.

Figures 1a and 1b show an example of a conventional rotary valve of this type, in which a valve body 1 has a resonance tube 3 and a slide tube 4 connected to the outer periphery of a cylinder 2 formed in a cylindrical shape. a ventilation hole 5 communicating with the resonance tube 3 and the slide tube 4;
6 is formed in the circumferential direction, and a drive shaft 8 protrudes outside the valve body 1 so that the rotor 7 can be rotated from the outside.

A lever mount 9 is fixed to the resonance tube 3, and a lever support 10 is fixed to the lever mount 9 with a set screw 11.

A lever 12 for rotationally driving the drive shaft 8 is rotatably supported on this lever support base 10 via a shaft 13, and is rotated clockwise in FIG. It is given a rotational habit of.

A drive rod 15 is integrally connected to the lever 12, and by fixing both ends of a string 16 to the tip of the drive rod 15 and wrapping the middle portion around the drive shaft 8, the lever 12 is moved as the lever 12 is pressed down. The drive shaft 8 is rotationally driven so that the length of the resonance tube 3 can be changed.

That is, the resonance tube 3 is normally connected to the ventilation hole 5, but when the rotor 7 rotates within a certain range as the drive shaft 8 rotates, the positions of the ventilation holes 5 and 6 shift as shown by the chain line. , the resonance tube 3 communicates with the slide tube 4.

As a result, the length of the resonance tube 3 becomes longer by the length of the slide tube 4 and the vent hole 6, and a different harmonic series is obtained than when the resonance tube 3 does not pass through the slide tube 4.

However, in the rotary valve device as described above, since the switching operation of the valve body 1 is performed via the string 16, the string 16 is easily cut and has poor durability, and the string 16 tends to stretch. This has the drawback that the valve body 1 cannot be switched reliably because the valve body 1 is easily loosened.

Therefore, in order to improve the above-mentioned drawbacks, for example, a link mechanism has been proposed in place of the string 16 (Japanese Utility Model Publication No. 47-15966).

However, although such devices can improve the durability and uncertainty of operation, which are the disadvantages of acupuncture points, not only is the link mechanism itself complicated and difficult to manufacture, but it also requires assembly due to the increased number of parts. The disadvantages are that the work is complicated and the product cost is high.

Furthermore, in all of the conventional devices described above, the lever must be biased by a return spring, which has the disadvantage of increasing the number of parts.

This idea was made in view of the above points, and it is a rotary valve device for brass instruments that has a simple structure, reduces the number of parts, and can reliably transmit the lever operation. The feature of this invention is that an energy storage spring is used as a transmission member that transmits the movement of the lever to the drive shaft, and this spring applies a biasing force to the lever.

Hereinafter, one embodiment of this invention will be described in detail with reference to the drawings.

FIG. 2 is a side view of the rotary valve according to this invention, and FIG. 3 is a plan view thereof.

In order to avoid complication of explanation, the same reference numerals as in FIG. 1 indicate the same constituent elements, and the explanation thereof will be omitted.

In these figures, one end of a connecting rod 20 is pin-coupled to the lower end of a driving rod 15 that is integrally connected to the lever 12, and the other end of this connecting rod 20 is extended to the side of the driving shaft 8. There is.

An energy accumulating spring 21 is attached to the circumferential surface of the drive shaft 8, which is formed in a band shape and always has an elastic force in the winding direction. The end is fixed to the other end of the connecting rod 20 by a set screw 22.

Therefore, the connecting rod 20 is always connected to the energy storage spring 21.
is biased to the right by the force of the lever 12.
is given a counterclockwise bias in FIG.

In this case, in a state where the lever 12 is locked in the substantially horizontal initial position, the resonance tube 3 is not communicating with the slide tube 4 and is set to a normal tube length.

An arm 30 is further fixed to the drive shaft 8, and a stopper pin 23 is vertically provided at the tip of the arm 30.

Corresponding to this stopper pin 23, a stopper 24 for regulating the rotation angle of the stopper pin 23, or in other words, the rotation angle of the drive shaft 8, is fixed to the upper surface of the cylinder 2 with a screw. However, stopper pieces 25a and 25b made of rubber or the like are fixed to the abutting portions to prevent noise.

Next, the operation of the above configuration will be explained.

First, with the stopper pin 23 in contact with the stopper piece 25a as shown in FIG. 4, the energy storage spring 21 is pulled and the drive shaft 8 is rotated clockwise as shown in FIG.

Then, the stopper pin 23 or the stopper piece 25 b
When the drive shaft 8 rotates until it comes into contact with the rotor, a ventilation hole (not shown) in the rotor switches to communicate the resonance tube 3 with the slide tube 4,
As a result, the length of the resonance tube 3 can be increased.

Furthermore, if the external force applied to the lever 12 is removed, the connecting rod 20 will slide back to the right due to the unwinding force of the energy storage spring 21, and as a result, the drive shaft 8 and the lever 12 will move in the opposite direction. When the stopper pin 23 contacts the stopper piece 25a, the stopper pin 23 automatically returns to its original state.

Thus, according to the above structure, since an energy storage spring is used as a transmission member, the structure is extremely simple and the number of parts is small compared to a structure using a conventional link mechanism, and therefore assembly and repair are easy. be.

In addition, the energy storage spring 21 has fewer breakage accidents than a string, and can improve durability. It also has less loosening due to stretching, so it can reliably transmit the movement of the lever 12 to the drive shaft 8. The valve can be switched smoothly and reliably, and since a biasing force is constantly applied to the lever 12, there are advantages such as the need for a return spring for the conventional lever.

Although the above embodiment uses a so-called mainspring as the energy storage spring, it is not limited to this, and wire rods for coil springs (with end treatment for fixation) that have the property of returning to a straight state can also be used. It's okay.

As explained in detail above, according to the rotary valve device for a brass instrument according to this invention, an energy storage spring that constantly applies a biasing force to the lever using stored energy is used as a transmission member, and the valve body is switched and operated. Since the structure is simple and the number of parts is small, it is easy to manufacture, assemble, and repair, which not only reduces manufacturing costs, but also has excellent durability and allows smooth and reliable valve switching. The effects are very large.

[BRIEF DESCRIPTION OF THE DRAWINGS] Figure 1 shows an example of a conventional rotary valve device.
is a side view thereof, b is a cross-sectional view taken along the line II in figure a, FIG. FIG. 4 is an explanatory diagram of the operation. DESCRIPTION OF SYMBOLS 1... Valve body, 3... Resonance tube, 7... Rotor, 8... Drive shaft, 12... Lever, 13... Shaft,
20...Connection rod, 21...Energy storage spring.

Claims (1)

[Scope of utility model registration request] A valve body that houses a rotor that changes the length of the resonance tube by rotation of a drive shaft, a lever that is rotated about the shaft, a movable connecting rod that has one end connected to this lever, and one end that is connected to the drive shaft. It is locked to the shaft, and the other end is locked to the other end of the connecting rod, and always applies a biasing force in the return direction to the lever via the connecting rod, and operates against this biasing force. A rotary valve device for a brass instrument, comprising an energy storage spring that transmits the movement of the lever to the drive shaft.