JPS5841593Y2 - Hinge for musical instrument storage case - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a case hinge for housing a musical instrument such as a keyboard wind instrument.

In general, musical instrument storage cases such as keyboard wind instruments have a structure in which the main body and the lid are connected via a hinge so that they can be opened and closed, and when playing, the lid stands up with the lid open and serves as both a musical instrument and a musical instrument. Because of this, the musical score is stopped at an angle that is easy for the performer to see (around 120 degrees with respect to the horizontal plane).

By the way, in conventional cases of this type, hinges are 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 in this way, when force is applied in the direction of opening the lid, the force is concentrated on the fixed part of the hinge, deforming that part and causing permanent strain.

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

For this reason, the lid, which also serves as both music and music, opens too much, making it impossible to maintain an appropriate opening angle for both music and music.

In order to avoid the disadvantages of such external hinge structures, internal hinges have been proposed.

That is, it has a structure in which the internal fixing part of a hinge consisting of a pair of fixing parts and an intervening connecting part is fixed to the inside of the main body of the case and the lid (filed on December 28, 1972, Utility Application No. 1973- 17
(See No. 5812 "Case for Keyboard Wind Instruments").

This internal type serves its purpose in terms of maintaining the proper angle of the lid and preventing deformation of the fixing part.

However, because the hinge is attached to the inside of the case, the axis of rotation of the lid when opening and closing is inside the case.

Therefore, in order to open the lid at a predetermined opening angle, a cut must be made on the outside of the case up to the hinge shaft, otherwise the lid cannot be opened smoothly.

In addition, when the lid is closed, this notch has the disadvantage that it looks like the lid is open.

The purpose of this invention is to eliminate the various drawbacks that occur when the hinge is of internal type as described above.

That is, the gist of this invention is to attach a hinge at a predetermined position inside the case so that the axis of rotation of the lid during opening and closing is located at the outermost side of the case.

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

FIG. 1 shows an example of a hinge of this invention.

This hinge 4 is made of synthetic resin and consists of a main body fixing part 41, a lid side fixing part 42, and a connecting part 43 between the two. At least one locking protrusion 6 is integrally formed so as to protrude to the side.

Each of the locking protrusions 6 is composed of an enlarged, for example, truncated conical head 61 and a leg 62 having a smaller diameter than the head 61, and the length of the leg 62 is equal to the length of the main body and the hinge of the lid. It is formed to have the same thickness as the wall of the attachment part, or, if a snap ring is used together, the thickness plus the thickness of the snap ring.

As shown in FIG. 2A, the hinge 4 is mounted through the through hole of the hinge mounting portion 3 of the case so that the connecting portion 43 faces outward.

When the protrusion 6 of the hinge 4 is press-fitted into the hinge locking hole 7 from inside the case, the head 61 has a larger diameter than the locking hole T, but since it is made of synthetic resin and has elasticity, the locking hole 7 is inserted, 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 so-called snap-fit state, and the hinge 4 is fixed with its main body side fixing part 41 fixed on the main body 1 side and the lid side fixing part 42 fixed on the cover 2 side. is,
The main body and the lid 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.

In this case, the length of the leg portion 62 is increased by the thickness of the snap ring.

When the lid 2 is opened, the connecting portion of the hinge 4 bends as shown in FIG. 2B, and the heads 61 of the opposing locking protrusions 6 abut against each other to provide a predetermined opening angle θ.

FIG. 3 shows the state of the hinge side when a case to which this invention is applied is placed horizontally, and a portion of the connecting portion 43 is visible exposed on the outside of the case.

In the above embodiment, the case where the locking protrusion 6 is integrally provided on the hinge 4 has been described, but the hinge can be attached to the case and the lid using separate screws and nuts instead of the locking protrusion. You can do it like this.

As is clear from the above description, the hinge of this invention is attached to the inside of the case, and the pivot point of the lid is located outside the case, so the lid can be opened and closed smoothly.

In addition, as long as the depth of the connecting part 43 (corresponding to the length of the leg 62 of the locking protrusion 6) is changed according to the thickness of the case where the hinge is installed, the lid can always be attached to a case of any thickness. The rotation axis of can be located at the outermost part of the case.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the hinge of this invention, Figure 2 A and B
3 is a sectional view showing the state in which the hinge of this invention is used, and FIG. 3 is a perspective view showing the external appearance of the hinge side of a case to which the hinge of this invention is attached. 1...Body, 2...Lid, 3...
・Hinge attachment part, 4... Hinge, 6... Locking protrusion, 7... Locking hole.

Claims (1)

[Scope of utility model registration request] It has a fixing part to the inside of the case body, a fixing part to the inside of the case lid, and a connecting part between the two, and the center of rotation of this connecting part when opening and closing the lid is located at the outermost part of the case body. Features a hinge for musical instrument storage cases.