JPH0337034Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a keyboard wind instrument that reduces the number of parts, simplifies installation and adjustment work, and improves quality.

Generally, this type of keyboard wind instrument has a plurality of flute chambers corresponding to each pitch, which are communicated with the mouthpiece through an air chamber, and a reed is arranged at the air inlet of each flute chamber. The opening and closing of the valve hole in each flute chamber is controlled by a reed valve that operates in conjunction with key operation, and the air flow discharged from the valve hole causes the reed corresponding to the key pressed to sound. It is composed of Fig. 1 shows a conventional example of a key structure. 1 is a key, 2 is a reed valve, and 3 is a lever. The key 1 and the reed valve 2 are usually made of plastic, and the lever 3 is made of aluminum or the like. It is made of light metal. Therefore, the base of the lever 3 is fitted into the engagement recess 4 provided on the lower surface of the rear end of the key 1, and is bonded with adhesive or integrally connected to the key 1 by heat welding. The valve 2 is adhesively fixed to the lower end of the lever 3.

However, since such a conventional key structure is composed of three members, the number of parts is large, and manufacturing and assembly operations are troublesome, which is a major factor in increasing costs. Furthermore, since the lever 3 is connected and fixed to the key 1 by adhesive or the like, the accuracy of the mounting angle of the lever 3 is very poor, and it takes a great deal of man-hours to correct the height of the key 1. Furthermore, when bonding the reed valve 2 and the like, the adhesive tends to adhere to parts other than the bonded area or to other constituent members, so care must be taken in handling. Furthermore, when the lever 3 is made of aluminum, when the key 1 is assembled into the main body of the musical instrument, if the lever 3 is bent, the key 1 is lifted up by that amount, causing many inconveniences such as the height of the key 1 becoming uneven. .

This idea was made in consideration of these points, and the key, lever, and reed valve are integrally molded from synthetic resin, and the cross-sectional shape of the lever is approximately that of a small box with an opening toward the base end of the key. In addition to forming the lever into a letter-shaped shape, the angle of inclination toward the tip of the key with respect to the hanging line of the lever to the key is set in the range of approximately 20 degrees to approximately 45 degrees, and the connection portion between the lever and the key is The present invention provides a keyboard wind instrument that solves the above-mentioned conventional problems at once by enlarging the side wall toward the proximal end of the key as it approaches the key.

This invention will be described in detail below based on embodiments shown in the drawings.

FIGS. 2a and 2b are a longitudinal cross-sectional view and an enlarged cross-sectional view taken along the - line, showing an embodiment of the keyboard wind instrument according to the invention, and FIG. 3 is a perspective view showing the keys taken out.
In these figures, a keyboard wind instrument 10 is equipped with a long box-shaped resonance cover 11 that is integrally formed of synthetic resin or the like and has an open top surface. A flute chamber forming member 12 integrally formed of resin or the like is housed and fixed.

A partition wall 13 is provided at one end of the flute chamber forming member 12.
A plurality of whistle chambers 14 partitioned by are arranged in parallel in the longitudinal direction of the whistle chamber forming member 12. Each of these flute chambers 14 has an air inlet A that opens downward and a valve hole B that opens laterally.
Further, on the lower surface of one end of the flute chamber forming member 12, there is a reed plate 15 that extends commonly to each flute chamber 14 and blocks the air inlet A of these flute chambers 14;
an air cover 17 forming an air chamber 16 between the
is fixed. And lead plate 15
has a plurality of slits 18 that communicate the air inlet A of each flute chamber 14 with the air chamber 16, and one end of a reed 19 of each pitch is riveted to the lower surface of the reed plate 15 in these slits 18. It is arranged as follows. The air chamber 16 is of the flute chamber forming member 12.
The air inlet 20 is integrally protruded from the player side end, that is, the left end in FIG.
A stand-up singing opening 21 (or a tabletop singing opening) is detachably connected to the opening.

A plurality of keys 22, each consisting of a plurality of white keys 22A and a plurality of black keys 22B, are arranged in the upper surface opening 11a of the resonance cover 11 in correspondence to each flute chamber 14 so as to be swingable in the vertical direction. That is, each key 22 engages the engagement recess 23 formed on the lower surface of the base side with the protrusion 24 protruding from the upper surface of the other end side of the flute chamber forming member 12, so that the protrusion 24 can be used as a fulcrum. It is supported so as to be able to swing freely in the vertical direction, and is always given a clockwise return behavior in FIG. 2b by a tension coil spring 25. In addition, a lever 26 is integrally provided vertically near the base of the lower surface of each key 22 and passes through an opening 27 formed in the flute chamber forming member 12.
A reed valve 28 is integrally formed at the lower end of the lever 26 to control opening and closing of the valve hole B corresponding to the key 22 in conjunction with key operation. This reed valve 28 normally closes the valve hole B due to the rotational behavior given to the key by the tension coil spring 25, and when the reed valve 28 moves away from the valve hole B in conjunction with the key operation when playing, , Utaguchi 2 for standing performance
1 through the air chamber 16 and slit 18 into the flute chamber 14 of the key concerned, through the valve hole B.
The airflow at the time of this discharge causes the reed 19 to play.

In this case, the key 22, lever 26 and reed valve 28 are integrally formed of synthetic resin,
By setting the inclination angle θ of the lever 26 to be small, insertion into the opening 27 and extraction from the opening 27 are facilitated. In addition, in order to increase the strength of the lever 26, the lever 26 is formed in a tapered shape that is wide at the base side with the key 22 and becomes narrower as it reaches the reed valve 28 side.
The key 22 may have a U-shaped cross-sectional shape that opens toward the tip of the key 22, and the lower half may have a U-shaped cross-sectional shape that opens toward the opposite side of the upper half. It has a U-shaped cross-section that opens out. A valve packing 29 made of sponge or the like is adhesively fixed to the surface of the reed valve 28 or the opening end surface of the valve hole B.
The surface of the reed valve 28 is brought into close contact with the opening end surface of the valve hole B.

As explained above, this device is constructed by integrally forming the key, lever, and reed valve, so the number of parts is small and it can be manufactured using one mold, so it is not only easy to manufacture, but also Since there is no need for any gluing process in the assembly process, the number of man-hours is reduced and costs can be significantly reduced. In addition, in this invention, the cross-sectional shape of the lever is approximately U-shaped with an opening toward the proximal end of the key, and the angle of inclination toward the distal end of the key with respect to the line from which the lever hangs to the key is approximately 20.
The angle between the lever and the key is set in the range of approximately 45 degrees, and the side wall of the connecting part between the lever and the key is enlarged toward the base of the key as it approaches the key, so when returning the key while playing an instrument, Sufficiently high mechanical strength is ensured for the key base of the lever, where a large external force is applied, such as when an external force is applied to further push up the key tip. Therefore, the durability and reliability of the movable member of this resin molded product can be dramatically improved. Further, since the lever is integrally formed, the inclination angle of the lever can be kept constant over all keys, and there is almost no need to adjust the height of the keys. In addition, since no adhesive is used, there is no possibility of contaminating the structural members, and the practical effects are very great.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing the key structure of a conventional keyboard wind instrument, FIGS. FIG. 3 is a perspective view showing the key of the musical instrument taken out. 10...Keyboard wind instrument, 12...Flute chamber forming member, 14...Flute chamber, 19...Reed, 22...
Key, 26...Lever, 28...Reed valve, B
...Valve hole.

Claims (1)

[Scope of Claim for Utility Model Registration] A flute chamber forming member that forms a flute chamber, and a flute chamber forming member that is disposed on the upper surface of this flute chamber forming member so as to be swingable in the vertical direction using the vicinity of its base end as a rocking fulcrum; A keyboard comprising: a key whose part is pressed; a reed valve which opens and closes the valve hole of the flute chamber in conjunction with the key; and a lever whose upper end is connected to the key and whose lower end is connected to the reed valve. In the wind instrument, the key, the reed valve, and the lever are integrally molded from synthetic resin, and the cross-sectional shape of the lever is formed into a substantially U-shaped shape with an opening toward the base end of the key. is inclined toward the tip of the key at an inclination angle within the range of approximately 20 degrees to approximately 45 degrees with respect to the line hanging down to the key, and furthermore, as the side wall of the joint between this lever and the key approaches the key, the key A keyboard wind instrument characterized by being expanded toward the base end.