JPS5841592Y2 - Keyboard wind instrument case - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improved structure of a case for housing a keyboard wind instrument such as a Pianica (trade name).

Generally, a case for a keyboard wind instrument has a structure in which the main body and the lid are connected via a hinge so that the instrument can be opened and closed. By closing the case, it can be hung and transported via an integrated carrying bundle.
Furthermore, during performance, the lid also serves as a music score, so that the music score is stopped at an angle (approximately 120 degrees with respect to the horizontal plane) that is easy for the player to see.

Conventional cases for keyboard wind instruments like this are generally made of a single-walled, single-panel structure made by injection molding for both the main body and the lid, which generate noise when carrying the instrument, and provide poor protection for the instrument inside. There were problems with the design's sharpness.

In order to strengthen the protection of the case and give a mellow interior appearance in terms of design, it has been proposed that at least one of the main body and the lid of the wind instrument has a hollow double-wall structure. Ta.

In the case of such a hollow double wall structure, the drawbacks of the single-panel structure mentioned above have been improved, but there are restrictions on the molding method and materials for the S, in which the hinge part is integrally molded. The disadvantage is that the hinge part breaks if opened and closed for a long period of time.

Therefore, in order to strengthen the hinge part of a case with a hollow double wall structure, it became necessary to install a separate hinge part instead of an integrally formed hinge part.

That is, the hinge is fixed to the outside of the main body and the lid with rivets or screws.

By the way, since the hinge is attached to the outside of the case like this, the hinge is made of synthetic resin and lacks rigidity, so when force is applied in the direction of opening the lid, the force concentrates on the upper part of the hinge, causing the caulked part to deform. Causes permanent distortion.

Additionally, the main body and lid tend to become twisted and distorted near the hinged portion.

As a result, the opening, which is compatible with both music, opens too much than necessary, and the proper opening angle for both music and music cannot be maintained.

The purpose of this invention is to solve the drawback of the above-mentioned exterior hinge structure that makes it impossible to maintain a proper opening angle of the lid.

That is, the gist of this invention is to attach the hinge to a predetermined position inside the case, and to cut the case and the meeting part when opening the lid inward in a V-shape.

This invention will be explained in more detail below with reference to the drawings.

FIG. 1 shows an example of a hinge 4 used in this invention.

This hinge 4 is made of synthetic resin and consists of a main body side fixing part 41, a lid side fixing part 42, and a connecting part 43 between the two.
One or more locking protrusions 6 are integrally formed at predetermined positions on both fixing parts 41 and 42, respectively.

Each locking protrusion 6 is composed of a large-diameter head 61 and a small-diameter leg 62, and the length of the leg 62 is the same as the thickness of the veneer wall of the hinge attachment part of the main body and lid, or as described below. If a snap ring is used in conjunction with the ring, it should be slightly larger than this.

What is shown in FIG. 2 is an example of the structure of the hinge mounting portion 3 of the case used in combination with the hinge 4 as described above.

The main body 1 and the lid 2 may have a single plate structure over the entire hinge side, but in order to not reduce the advantages of the hollow structure as much as possible, it is preferable to make only the hinge attachment part 3 a single plate structure as shown in the figure. is desirable.

A hinge locking hole 7 is transparently formed in this single plate portion.

The diameter of this locking hole 7 is made smaller than the head portion 61 shown in FIG. 1 and slightly larger than the leg portion 62.

In addition, a V-shaped notch 9 is formed on the outside of the opening meeting portion of the main body 1 and the lid 2 (the portion that faces each other when the lid 2 is opened), extending over the entire length of the boundary line between the two (6th (See figure) The opening angle Q is set at around 120 degrees.

To install the hinge 4, as shown in FIG. 3A, press the protrusion 6 of the hinge 4 into the hinge locking hole 7 at the hinge installation part 3 of the case. Since the case is made of synthetic resin and has elasticity, the locking hole 7 is pushed wide and the head 61 comes out to the outside of the case.

As a result, the locking protrusion 6 engages with the locking hole 7 in a snap-fit state, and the hinge 4 has its main body side fixing part 41 facing the main body 1 side and the lid side securing part 42 facing the lid 2 side. The main body 1 and the lid 2 are connected via the connecting portion 43.

Due to the size relationship between the diameters of the locking protrusion 6 and the locking hole 7, the hinge 4 will not fall off from the case even in the engaged state shown in the figure, but in order to ensure this engagement, A known snap ring may be interposed between the head 61 of the locking projection 6 and the outer surface of the case.

When the lid 2 is opened, the connecting portion 43 of the hinge 4 is exposed as shown in FIG. 3B.
extend, the heads 61 of the opposing locking protrusions 6 come into contact with each other, and the meeting portions of the lid 2 and the main body 1 press against each other when the lid is opened, giving an opening angle θ between the two.

Incidentally, when the case is positioned as shown in FIG. 4, the heads 61 of the locking protrusions 6 that protrude outside the case also serve as legs.

In the above example, the hinge was attached to the case using the locking protrusion 6 itself of the hinge 4, but a combination of bolts and nuts may also be used as shown in FIG.

That is, a through hole 63 is provided in the locking projection 6, and a large diameter recess 64 is formed by the head 61, into which the bolt 8 is inserted from the outside.
1 and tighten it with a nut 82 on the inside.

FIG. 6 shows the state of the hinge side when a case to which this invention is applied is placed horizontally.

Although the hinge shown in Fig. 1 is made of synthetic resin, it is not necessarily limited to this, and it goes without saying that conventionally known metal hinges may also be used, and in that case, installation to the case will be difficult. It is not necessarily necessary to use a locking protrusion, but it may be screwed in a conventionally known manner.

As is clear from the above explanation, in this invention, the hinge is attached to the inside of the case, so when the lid is opened, the hinge just hugs the veneer wall of the case, and the veneer wall is twisted and distorted when the lid is opened. Nothing like that.

Furthermore, since the meeting parts of the case press against each other when the lid is opened to maintain the opening angle, a proper opening angle can be maintained without putting stress on the hinges and the end plates of the case.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of the hinge used in the case of this invention, Fig. 2 is a sectional view showing the area around the hinge attachment part of the case of this invention, and Figs. 3 A and B are the closed and opened states of the case. 4 is a side view showing an example of the case of this invention in an upright state, FIG. 5 is an enlarged sectional view showing another example of the hinge, and FIG. 6 is the hinge side of the case of this invention. FIG. 3 is a perspective view showing the external appearance. 1...Body, 2...Lid, 3...
・Hinge attachment part, 4...Hinge, 6...Latching protrusion, 7...Hinge locking hole.

Claims (1)

[Claims for Utility Model Registration] At least at the hinge attachment portion of the main body and the lid, the hinge is attached at a predetermined position inside the hinge attachment portion of the main body and the lid, and the main body and the lid meet when the lid is opened. A case O for a keyboard wind instrument that has a V-shaped section cut out inward.