JP2006215489A - Elongation fatigue prevention device of bellows tube in mouthpiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the elongation fatigue of a bellows tube in a mouthpiece, to maintain the bellows tube always in a specified form so as to permit playing any time under the same conditions, and to obviate the occurrence of a problem at the time of housing the mouthpiece into a musical instrument case after use. <P>SOLUTION: The mouthpiece has a bellows structure and has a juncture to a musical instrument body and a bellows tube constituted by attaching mouthpiece sections to be held in the user's mouth at both ends, in which the external force to elongate the bellows tube 14 acts to elongate the bellows tube 14 beyond the prescribed length or when the bellows tube tends to be elongated, resistance is applied thereto and the elongation fatigue of the bellows tube 14 is thereby prevented. For this purpose, the device has the configuration that the juncture 12 and the mouthpiece sections are connected by using thread-like sizing members 20 having small elongation and contraction properties. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bellows tube elongation fatigue prevention device having a bellows structure and having a bellows tube having a bellows tube attached to both ends of a connection portion to a musical instrument main body and a mouth portion attached to the mouth.

  A keyboard wind instrument, also known as a keyboard harmonica, is usually played using either a stand-out or a table-top, and in the case of a table-top, the length is about 400 to 500 mm. A bellows tube is used to communicate the tabletop musical instrument with the mouth of the mouth. The bellows tube is a plastic molded product, and its length can be changed by stretching or compressing it from the dimension at the time of molding. Therefore, if the performance is performed with the bellows part stretched or pulled strongly, it may stretch due to fatigue and may not return to its original length. Even if the length of the bellows tube is changed, it is difficult to cause a problem that would impede performance. However, there is a problem that after use, if the mouthpiece does not fit well when stored in the instrument case, or if it is pulled too much, the cross-sectional shape is crushed and the airflow does not flow smoothly. Keyboard wind instruments are widely used in elementary school music education, and it is thought that the rate of consumption is not small, so there is a need to solve this problem. However, there is no invention or device that discusses this problem.

Japanese Utility Model Publication No.6-21094

  The present invention has been made paying attention to the above points, and its object is to prevent elongation fatigue of the bellows tube at the mouth. Another object of the present invention is to always keep the bellows tube in a constant form and perform it under the same conditions, and to prevent problems when storing the mouthpiece in the instrument case after use.

  In order to solve the above-mentioned problems, the present invention extends the bellows tube in a bellows tube having a bellows structure having a bellows tube having a bellows structure and a bellows tube formed by attaching a mouth portion to the mouth at both ends. In order to provide resistance when an external force is exerted and the bellows tube is stretched or stretched beyond a predetermined length, thereby preventing the fatigue of the bellows tube, it is a thread-like constant Means for connecting the connecting portion and the opening portion using a dimension member is taken.

  A bellows tube having a bellows tube structure in which a connecting portion to a musical instrument main body and a mouth portion to be added to the mouth are attached to both ends is well known, and is also described in, for example, Japanese Utility Model Laid-Open No. 6-21094. It may have the same configuration. The bellows tube is made of plastic, and the connecting portion and the mouth portion are fitted and attached to the end openings at both ends of the bellows tube by elastic deformation. This bellows tube is a plastic molded product, and it is assumed that the bellows tube is used with a predetermined length substantially equal to the dimension at the time of molding.

However, if the bellows tube is stretched beyond a predetermined length, elongation fatigue occurs, so a sizing member is attached between the connecting portion and the throat portion to prevent the bellows tube from being stretched. As the fixed-size member, a thread-like member having low stretchability is appropriate, and the thread-like member includes a thread, a fine string, a wire, and the like. However, the thread-like member may have stretchability as long as it does not cause elongation fatigue of the bellows tube.

The connection part and the shed have a fitting end that fits into the opening of the end when attached to the bellows tube end, and attachment of a hole or protrusion for attaching a thread-like sizing member to the fitting end A configuration in which the portion is provided and the sizing member is disposed in the bellows tube is desirable. It is desirable that the attachment part is provided at each fitting end of the connection part and the mouth part so as not to protrude inwardly or outwardly. The adverse effects of hindrance can be almost eliminated.

  Since the present invention is constructed and operates as described above, the fatigue fatigue of the bellows tube at the mouth is prevented, the bellows tube is always kept in the best condition, and the performance is always performed under the same conditions. In addition, there is an effect that even when the shed is stored in the musical instrument case after use, it always fits in a predetermined place.

  Hereinafter, the present invention will be described in more detail with reference to illustrated embodiments. The figure shows the bellows tube elongation fatigue prevention device in the shed 11 according to the present invention. The shed 11 has a bellows structure, and has a configuration in which a connection portion 12 to the instrument body 10 and a throat portion 13 added to the mouth are attached to both ends of the bellows tube 14.

  The bellows tube 14 is formed by molding in a bellows shape using a relatively soft synthetic resin, and has a bellows structure composed of continuous irregularities over almost the entire circumference and the entire length. The bellows structure extends almost the entire length of the bellows tube, but both end portions 15 and 16 are formed in a cylindrical shape, and can be elastically deformed for connection with the connection portion 12 and the mouth portion 13. It is. Both end portions 15 and 16 of the bellows tube 14 may have the same diameter or different diameters.

  The connecting portion 12 and the throat portion 13 have fitting end portions 17 and 18 that are fitted into the end opening when attached to the bellows tube end portions 15 and 16. The fitting portion between the fitting end portions 17 and 18 and the bellows tube end portions 15 and 16 is provided with sealing means 19 and 19 that can be connected while maintaining airtightness. A similar structure may be used. The fitting end portions 17 and 18 are provided with attachment portions 21 and 22 such as holes or protrusions for attaching the thread-like sizing member 20.

  The illustrated attaching portions 21 and 22 have through holes 24 in the extending portions 23 formed so as to extend from the end surfaces of the fitting end portions 17 and 18 in the connecting direction to the connecting bellows tube end portions 15 and 16. The attachment is performed by opening and threading the thread-shaped sizing member 20 through the through-hole 24 and binding them. See FIGS. 4A and 4B. The outer peripheral surface 25 of the extending portion 23 is inclined inward (FIG. 4B), facilitates fitting to the bellows tube ends 15, 16, and is attached to the end portion of the bellows tube by the thread-like sizing member 20 bound thereto. 15 and 16 are configured to prevent or minimize the inflating.

  The thread-like sizing member 20 supports the resistance against the stretching force when an external force that stretches the bellows tube 14 works and the length of the bellows tube 14 exceeds a predetermined length, thereby supporting the bellows tube. 14 is prevented. Since the illustrated example is made of nylon tex and hardly exhibits elongation, the bellows tube 14 does not stretch, so that the problem of elongation fatigue hardly occurs. The thread-like sizing member 20 may exhibit slight stretchability as long as it does not cause fatigue. In this case, the limit of expansion and contraction depends on the resin material, but it is appropriate that the length of the bellows tube 14 at the time of molding is increased by 20%.

  Even in the shed 11 having the bellows tube 14 of the present invention having such a configuration, it is possible to perform a performance by connecting the connecting portion 12 to the connecting port 26 of the instrument body 10 and adding the shed portion 13 to the mouth. It is exactly the same as the conventional one. On the other hand, since the shed 11 in the present invention is substantially kept at a predetermined length by the sizing member 20, even if the gusset is pulled, the child hangs while holding the musical instrument body 10 with the shed 13 provided. Even so, the full length of the shed does not extend, and the fatigue of the bellows tube 14 does not occur at all. Further, the thread-shaped sizing member 20 does not interfere with anything and does not affect the acoustics.

The whole perspective view which shows the Example of the elongation fatigue | exhaustion prevention apparatus of the bellows tube which concerns on this invention. The exploded perspective view of an apparatus same as the above. Similarly longitudinal section. It is the elements on larger scale of a bellows pipe connection part, A is a top view, B is a side view with respect to A. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Musical instrument body 11 Higuchi 12 Connection part 13 Higuchi part 14 Bellows part 15, 16 Bellows tube end part 20 Fixed-size member 21, 22 Attachment part

Claims (2)

With a bellows structure, having a bellows tube having a bellows tube attached to both ends of a connection portion to the instrument body and a mouth portion added to the mouth,
The external force that stretches the bellows tube acts to provide resistance when the bellows tube is stretched over or stretched over a predetermined length, thereby preventing stretch fatigue of the bellows tube An apparatus for preventing fatigue of a bellows tube in a shed having a configuration in which a connecting portion and a throat portion are connected using a small thread-like sizing member. The connection part and the shed have a fitting end that fits into the opening of the end when attached to the bellows tube end, and attachment of a hole or protrusion for attaching a thread-like sizing member to the fitting end The apparatus according to claim 1, wherein the sizing member is disposed in the bellows tube.

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