JPH0962252A - Falling prevention mechanism for keyboard lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of an unpleasant sound when a keyboard lid is opened. SOLUTION: A magnet 18 is fixed on the bottom end face of a keyboard lid rear appendage 15 of a keyboard lid 4. A catcher magnet 6 is fixed on the top face of the catcher fitting wood 21 (only the left side is shown in Fig). In a state where the keyboard lid 4 is open, that is, in a state where the bottom end of keyboard main body 14 engages with the notch 12 of a side block 2, and the back face of the keyboard lid main body 14 abuts a rubber button 7 fitted onto a lower roof 5, the catcher magnet 6 is provided at a position confronting the magnet 18 fixed on the keyboard lid rear appendage 15, and is also provided so as to be apart from the magnet 18 with a predetermined spacing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall prevention mechanism for a keyboard lid of a keyboard instrument, and more particularly, when the keyboard lid that is openably and closably supported around a support shaft is in an open state, the keyboard lid unexpectedly drops. The present invention relates to a fall prevention mechanism for a keyboard lid that prevents the movement.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 5 and 6, a keyboard lid 10 which is openably and closably supported around a support shaft 117.
In the piano equipped with No. 4, the arrow lid-shaped projection 118 is provided on the lower end surface of the keyboard lid 104, and the catcher 106 is provided on the back side of the time signature tree so that the keyboard lid 104 is closed unexpectedly in the open state. A keyboard lid fall prevention mechanism that locks so that there is no This catcher 106 is a catcher mounting tree 1 on the back side of the time signature tree.
Fixed to 21 and two flexible shafts 106b, 106b
The rotor 1 which extends and is rotatable at the tip of each shaft 106b.
It has a structure in which 06a and 106a are attached.
According to this keyboard lid fall prevention mechanism, when the keyboard lid 104 is opened around the support shaft 117, the arrow-shaped projection 118 provided on the lower end surface of the keyboard lid 104 causes the rotors 106a, 1 to rotate.
Between the rotors 06a and the protrusions 118
After passing between a and 106a, flexible shafts 106b, 1
06b returns to the original state, and both rotors 106a, 106
a holds the protrusion 118 in a sandwiched state. Therefore, even if a force suddenly acts on the open keyboard lid 104 in the closing direction, the keyboard lid 104 does not drop easily.

[0003]

However, in the conventional keyboard lid drop prevention mechanism, when the keyboard lid 104 is opened and the barbed protrusion 118 is fitted into the catcher 106,
There was a problem that a clicking noise was generated and gave an unpleasant feeling, and the customer sometimes complained. An object of the present invention is to prevent an unpleasant sound from being generated when the keyboard lid is opened in such a keyboard lid fall prevention mechanism.

[0004]

In order to solve the above-mentioned problems, the invention according to claim 1 suddenly drops the keyboard lid which is openably and closably supported about a support shaft when the keyboard lid is in an open state. In the fall prevention mechanism of the keyboard lid that prevents
A first member provided on the keyboard lid, and a second member provided on the musical instrument body so as not to come into contact with the first member at a position facing the first member of the open keyboard lid, At least one of the first member and the second member is a magnet and the other is attracted.

The invention of claim 2 is the fall prevention mechanism for a keyboard lid according to claim 1, wherein the first member is provided on a lower end side of the keyboard lid, which is not shown in the external appearance of the musical instrument. And The invention of claim 3 is the fall prevention mechanism for a keyboard lid according to claim 1 or 2, wherein both the first and second members are magnets.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The fall prevention mechanism for a keyboard lid of the present invention is a keyboard provided with a keyboard lid that is openably and closably supported around a support shaft, such as a piano (upright, ground). Any musical instrument can be applied.
In such a keyboard instrument, when the keyboard lid is opened around the support shaft, the keyboard lid is supported by a rubber button or the like provided behind it while leaning vertically or diagonally. At this time, it is preferable to prevent the keyboard lid from falling over by setting a center of gravity such that the keyboard lid is tilted backward by providing a weight on the back surface of the keyboard lid. In the fall prevention mechanism of the keyboard lid of the present invention, in the state where the keyboard lid is opened in this way, The provided second member is arranged so as to face each other while maintaining a non-contact relationship. At this time, at least one of the first member and the second member is a magnet and attracts the other, so that the attraction force is increased. This prevents the keyboard lid from accidentally falling. Here, one may be a magnet and the other may be a magnetic body (for example, a metal containing iron as a main component), and both the first member and the second member are magnets (at this time, both have different magnetic poles). May be However, since the attraction force is stronger when both are magnets, the effect of preventing the keyboard lid from falling can be more significantly obtained. Further, in the state where the keyboard lid is opened, the distance between the first member and the second member may be set appropriately within a range where a suction force acts between them, but if the distance is too narrow, the keyboard lid is opened. Since there is a possibility that both members will come into light contact with each other due to the momentum and noise may be generated, it is preferable to separate them by at least 0.5 mm. Further, it is preferable that the first member is provided on the lower end side of the keyboard lid and at a portion that does not appear in the appearance of the musical instrument (for example, the lower end surface of the keyboard lid) in order to keep the aesthetic appearance of the musical instrument.

As described above, according to the present invention, an unpleasant sound is not generated when the keyboard lid is opened, and since the structure is simple, it is easy to assemble and the manufacturing cost is low. . Further, since the magnet is used, the same fall prevention effect as in the initial stage can be surely obtained even if it is repeatedly used.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the drawings. It is needless to say that the embodiment of the present invention is not limited to the following examples, and various forms can be adopted as long as they are within the technical scope of the present invention. FIG. 1 is a perspective view around the keyboard lid of the piano of this embodiment,
FIG. 2 is a side view of the same. Around the keyboard lid of the piano,
A time signature 2, a keyboard lid 4, and a catcher magnet 6 are arranged.

The time signature 2 is the upper surface of the shelf 3 and is the keyboard 8.
The cutouts 12 are provided on both the left and right sides, and are cut off in a rectangular shape on the back side. Felt is attached to the surface of the notch 12. The keyboard lid 4 includes a keyboard lid main body 14 having an approximately L-shaped cross section, a keyboard lid main body 14 having a substantially corrugated cross section adhered to the back side of the keyboard lid main body 14, a keyboard lid main body 14 and a keyboard lid rear retrofit 15. It is configured by a keyboard lid triangle 16 which is a substantially triangular plate material that fills the space. Support shafts 17 project from the left and right side surfaces of the keyboard lid 4. The support shaft 17 is rotatably supported by a bearing (not shown) provided on a side plate of the piano body. Further, magnets 18 (the first member of the present invention, only the left side is shown in FIG. 1) are fixed to the left and right sides of the lower end surface of the keyboard cover retrofit 15. The magnet 18 has a shape elongated in the left-right direction and has a length substantially equal to the left-right width of the time signature 2. This magnet 18
Since the appearance of the piano does not appear when the keyboard lid 4 is opened or closed, the aesthetic appearance of the piano is not impaired.

With the keyboard lid 4 closed, the keyboard lid body 1
The tip of 4 makes light contact with the mouthpiece 9. On the other hand, when the keyboard lid 4 is opened, the lower end of the keyboard lid main body 14 engages with the notch 12 of the time signature 2 and the back surface of the keyboard lid main body 14 contacts the rubber button 7 attached to the lower roof 5. A weight member 19 extending laterally is fixed between the keyboard lid main body 14 and the keyboard lid retrofit 15.

Magnet 6 for catcher (second member of the present invention)
Is fixed to the upper surface of a catcher attachment tree 21 (only the left side is shown in FIG. 2) provided on the shelf plate 3 (piano body) on the back side of the time signature 2 on both the left and right sides. This catcher magnet 6 is in a state in which the keyboard lid 4 is open, that is, the keyboard lid body 14
The lower end of the key engages with the notch 12 of the time signature 2 and the back surface of the keyboard lid main body 14 abuts on the rubber button 7 attached to the lower roof 5 so as to face the magnet 18 fixed to the keyboard lid retrofit 15. It is provided at a position and spaced apart from the magnet 18 by a predetermined distance. The catcher attachment tree 21 is formed so as to be equal to or slightly narrower than the left and right widths of the left and right time signature trees 2. This catcher magnet 6 is the magnet 1 fixed to the lower end surface of the keyboard cover retrofit 15.
Together with 8, the keyboard lid fall prevention mechanism is configured. Both magnets 6 and 18 have different magnetic poles.

The operation of the keyboard lid fall prevention mechanism of the present embodiment having the above construction will be described. When the keyboard lid 4 in a closed state (two-dot chain line in FIG. 2) is opened around the support shaft 17, the back surface of the keyboard lid main body 14 contacts the rubber button 7, and at the same time, the lower end of the keyboard lid main body 14 becomes the time signature 2. It engages with the notch 12 provided. When the keyboard lid 4 is opened, the keyboard lid is attached 1
Since the magnet 18 provided on the lower end surface of the magnet 5 does not come into contact with the catcher magnet 6, no contact noise (unpleasant noise) is generated between the magnets 18, 6. Further, when the keyboard lid 4 is open, the center of gravity of the keyboard lid 4 is set to fall backward due to the presence of the weight member 19, so the keyboard lid 4 remains stationary in the open state. Further, although the magnet 18 provided on the lower end surface of the keyboard cover rear portion 15 is separated from the catcher magnet 6, a force in the direction of approaching each other acts between them. That is, the attraction force of both magnets 6 and 18 acts in the direction opposite to the direction in which the keyboard lid 4 is closed. Therefore, even if a force is applied to the open keyboard lid 4 in the closing direction, the keyboard lid 4 does not easily drop. Further, since the structure is simpler than that of the conventional example shown in FIGS. 5 and 6, the assembling is easy, and the manufacturing cost is reduced because a simple magnet is used. Furthermore, since the attractive force of the magnet is used, even if it is repeatedly used, the same fall prevention effect as in the initial stage can be reliably obtained.

As a modified example of this embodiment, as shown in FIG. 3, when the keyboard lid 4 is opened, the catcher magnet 6 is located in front of the magnet 18 provided on the lower end surface of the keyboard lid retrofit 15 (see FIG. 4). The magnet 18 is provided on the lower end surface of the keyboard lid main body 14 and the catcher magnet 6 forms the cutout portion 12 of the time signature 2 as shown in FIG. It may be provided so as to be separated from the magnet 18 by a predetermined distance on the horizontal plane side of the two surfaces. In any case, the same operational effect as that of the above-described embodiment is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view around a keyboard lid of a piano of this embodiment.

FIG. 2 is a side view around the keyboard lid of the piano of this embodiment.

FIG. 3 is a side view around a keyboard lid of a piano of a modified example of this embodiment.

FIG. 4 is a side view around a keyboard lid of a piano of a modified example of this embodiment.

FIG. 5 is a side view around a keyboard lid of a conventional piano.

FIG. 6 is an explanatory diagram of a conventional keyboard lid fall prevention mechanism.

[Explanation of symbols] 2 ... time signature, 3 ... shelf board, 4 ・
..Keyboard lids, 5 ... lower roof, 6 ...
・ Magnet for catcher, 7 ・ ・ ・ Rubber button, 8 ・
..Keyboards, 9 ... mouth sticks, 12 ...
* Notch part, 14 ... keyboard lid body, 15
... keyboard lid retrofit, 16 ... keyboard triangle,
17 ... Support shaft, 18 ... Magnet, 1
9 ... weight member, 21 ... catcher mounting tree,

Claims (3)

[Claims] 1. A fall prevention mechanism for a keyboard lid, which prevents the keyboard lid from accidentally falling when the keyboard lid that is openably and closably supported about a support shaft is in an open state, wherein the keyboard lid is provided on the keyboard lid. The first member at a position facing the first member of the open keyboard lid.
A fall prevention mechanism for a keyboard lid, comprising: a second member provided in the instrument body so as not to come into contact with the member, wherein at least one of the first member and the second member is a magnet and the other is attracted. 2. The fall prevention mechanism for a keyboard lid according to claim 1, wherein the first member is provided at a lower end side of the keyboard lid and a portion which does not appear in the appearance of the musical instrument. 3. The fall prevention mechanism for a keyboard lid according to claim 1, wherein the first and second members are both magnets.