JP2021096488A - Keyboard instrument - Google Patents

Abstract

To provide a keyboard instrument in which a pinion gear is not used for an opening/closing mechanism of a keyboard lid.SOLUTION: A keyboard instrument 1 comprises: a keyboard lid 10; a sidewall section 20 having a guide groove 21 for guiding opening/closing of the keyboard lid 10; an arm member 23 which has a coupling section 23C coupled to the keyboard lid 10 and which rotates with a rotation shaft 22 as a center when the keyboard lid 10 is opened/closed; and an elastic member 24 in which a first arm section 24B regulated by a regulation section 27A of a sidewall section 20-side is arranged at one end and a second arm section 24C which regulates rotation of the arm member 23 is arranged at the other end, and which is pivotally supported by the rotation shaft 22. The second arm section 24C is locked to a locking hole 23B formed in the arm member 23.SELECTED DRAWING: Figure 2

Description

The present invention relates to a keyboard instrument.

Patent Document 1 describes an arm member that rotates around a fulcrum in response to an opening / closing operation of a keyboard lid in a lid opening / closing device that covers a keyboard portion provided in a musical instrument case so that the keyboard lid can be opened / closed. A pinion gear that is rotatably attached by a rotating shaft, an arc-shaped guide gear that rotates while the pinion gear meshes with the rotation of the arm member, and a pinion that is formed on the arm member and opens and closes the keyboard lid. A keyboard instrument having a lid opening / closing device including a damper mounting portion capable of mounting a damper member for applying a load to a gear independently of an arm is disclosed.

Japanese Unexamined Patent Publication No. 2013-2574663

However, the keyboard instrument of Patent Document 1 has a large number of parts using pinion gears and the like, and it is necessary to apply grease to the parts where these gears are used in maintenance. It also takes time and effort.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a keyboard instrument in which a pinion gear is not used for the opening / closing mechanism of the keyboard lid.

In order to achieve the above object, the keyboard instrument according to the embodiment of the present invention has a keyboard lid, a side wall portion having a guide groove for guiding the opening and closing of the keyboard lid, and a connecting portion for connecting to the keyboard lid. An arm member that rotates about a rotation axis when the keyboard lid is opened and closed, and a first arm portion that is regulated by a regulation portion on the side wall portion side are provided at one end to restrict the rotation of the arm member. The second arm portion is provided at the other end and includes an elastic member pivotally supported by the rotating shaft, and the second arm portion is locked in a locking hole provided in the arm member. It is characterized by that.

According to the present invention, it is possible to provide a keyboard instrument in which a pinion gear is not used for the opening / closing mechanism of the keyboard lid.

It is a partial perspective view which shows the keyboard instrument which concerns on embodiment of this invention, (a) is the figure which shows the state which the keyboard lid is closed, and (b) is the figure which shows the state which the keyboard lid is open. It is a figure for demonstrating the open / closed state of the keyboard lid so that the inner surface of the side wall part which concerns on embodiment of this invention is seen from the front. It is a figure for demonstrating the open / closed state of the keyboard lid so that the inner surface of the side wall part which concerns on embodiment of this invention is seen from the front. It is a figure for demonstrating the open / closed state of the keyboard lid so that the inner surface of the side wall part which concerns on embodiment of this invention is seen from the front. It is a figure for demonstrating the open / closed state of the keyboard lid so that the inner surface of the side wall part which concerns on embodiment of this invention is seen from the front. It is a figure for demonstrating the open / closed state of the keyboard lid so that the inner surface of the side wall part which concerns on embodiment of this invention is seen from the front. In order to make it easy to see the state of the inner surface of the side wall portion according to the embodiment of the present invention, the illustration of some members such as the keyboard lid is omitted from FIG. It is a figure for demonstrating the arm member which concerns on embodiment of this invention and the elastic member attached to the arm member, (a) is the figure which shows before attaching the elastic member to the arm member, (b) is elastic to the arm member. It is a figure which shows the place where the member was attached.

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a partial perspective view showing a keyboard instrument 1 according to an embodiment of the present invention, FIG. 1A is a diagram showing a state in which the keyboard lid 10 is closed, and FIG. 1B is a diagram showing a state in which the keyboard lid 10 is closed. It is a figure which shows the state which opened.

2 to 6 are views for explaining the opened / closed state of the keyboard lid 10 so that the inner surface of the side wall portion 20 is viewed from the front.
Note that FIG. 2 shows a state in which the keyboard lid 10 is closed, and a state in which the keyboard lid 10 is sequentially opened as the process proceeds from FIG. 3 to FIG. 6 is shown.

Further, FIG. 7 is a diagram in which some members such as the keyboard lid 10 are omitted from FIG. 2 so that the state of the inner surface of the side wall portion 20 can be easily seen.

As shown in FIG. 1 (b), the keyboard instrument 1 has a keyboard lid 10 that covers the keyboard portion 2 in which the switches and keys for operation are arranged, and as shown in FIG. 1 (a). The keyboard lid 10 includes a front lid 11 and a rear lid 12.

As shown in FIG. 2, the front lid 11 is provided with a finger insertion fitting 11A for a user to insert a finger when opening / closing the keyboard lid 10 attached to the lower side on the front side.

Then, on the lower end side of the finger insertion bracket 11A, a front guide shaft that projects toward the side wall portion 20 so that it can be inserted into the guide groove 21 provided in the side wall portion 20 described later, and guides the opening / closing operation of the front lid 11. 11B is provided.

Further, the rear portion of the front lid 11 and the front portion of the rear lid 12 are rotatably connected by a rotation shaft (not shown).
Then, in close to the rotatably connected portion, the rear lid 12 projects toward the side wall portion 20 so that the rear lid 12 can be inserted into the guide groove 21 provided in the side wall portion 20 described later, and the rear lid 12 A guide member 12B having a rear guide shaft 12A for guiding the opening / closing operation of the above is attached.

On the other hand, as shown in FIG. 7, a rotating shaft 22 is provided on the side wall portion 20, and an arm member 23 is rotatably attached to the rotating shaft 22 about the rotating shaft 22. In the present embodiment, the rotating shaft 22 is provided on the side wall portion 20 side, but the rotating shaft 22 may be provided on the arm member 23 side, and the shaft hole 23A corresponding to the rotating shaft 22 is provided on the side wall portion 20 side. It may be provided in.

FIG. 8 is a diagram for explaining the arm member 23 and the elastic member 24 attached to the arm member 23, FIG. 8 (a) is a diagram showing before the elastic member 24 is attached to the arm member 23, and FIG. 8 (b) is a diagram. It is a figure which shows the place where the elastic member 24 is attached to the arm member 23.

As shown in FIG. 8A, the arm member 23 includes a shaft hole 23A corresponding to the rotating shaft 22 (see FIG. 7) and a substantially L-shaped locking hole 23B.

Further, the arm member 23 is attached to the keyboard lid 10 (more specifically, the rear lid 12) by the rotating shaft 12D supported by the rotating shaft support member 12C attached to the lower side of the rear side of the rear lid 12 shown in FIG. ) Is provided as a connecting portion 23C (see FIG. 8A) formed as a through hole to be connected to the).

Then, as shown in FIG. 8A, the elastic member 24 extends from the coil portion 24A, the first arm portion 24B extending from one end of the coil portion 24A, and the second extending from the other end of the coil portion 24A. The second arm portion 24C has an arm portion 24C, and the second arm portion 24C is bent so that the tip side thereof is U-shaped outside the coil portion 24A, and has the bent portion 24CA.
In the present embodiment, a protective tape (see the black-painted portion) is provided at the tip of the first arm portion 24B, but the protective tape may not be provided. Further, in the present embodiment, the locking holes 23B are provided in a substantially L-shape, but even if the locking holes 23B are not L-shaped, the bent portion 24CA of the second arm portion 24C of the elastic member 24 can be easily locked. All you need is.
Further, in the drawings other than FIG. 8, the description of this protective tape is omitted.

The elastic member 24 is attached to the arm member 23 so that the bent portion 24CA is hooked on the locking hole 23B of the arm member 23 from the inside of the arm member 23, and the arm member 23 is later attached by the elastic member 24. The rotational movements described are regulated.

When the elastic member 24 is arranged so as to accommodate the coil portion 24A of the elastic member 24 in the arm member 23, the center of the coil portion 24A and the position of the shaft hole 23A of the arm member 23 are aligned with each other. The coil portion 24A is pivotally supported by the rotating shaft 22 provided on the side wall portion 20 shown in FIG. 7 together with the arm member 23.

On the other hand, as shown in FIG. 7, the side wall portion 20 is provided with a plurality (pair) of engaging protrusions 25 and 26 near the rotating shaft 22, and the rotating shaft 22 and the engaging protrusions 25 are provided with screws. A screw hole 25A and a screw hole 22A for screwing N are formed.

Then, as shown in FIG. 2, an engaging member 27 that engages with the rotating shaft 22 and the plurality of engaging projections 25 and 26 and is fixed by the screw N and serves as a cover is provided. There is.

The engaging member 27 is formed so as to be able to accept the first arm portion 24B of the elastic member 24 at a position between the plurality of engaging protrusions 25 and 26, and is formed between the plurality of engaging protrusions 25 and 26. The position is the regulation portion 27A that regulates the movement of the first arm portion 24B.

Next, the state when the keyboard lid 10 is opened will be described in more detail.
As shown in FIG. 7, the guide groove 21 has a tip groove portion 21A extending downward in the vertical direction and a horizontal groove portion 21B extending from the tip groove portion 21A toward the rear side, and the horizontal groove portion 21. A guide recess 21BA is provided at a position slightly forward of the intermediate position in the front-rear direction of the 21B.

Then, as shown in FIG. 2, when the keyboard lid 10 is closed, the front guide shaft 11B is located at the lower end of the tip groove 21A, and the rear guide shaft 12A is located at the lower end of the guide recess 21BA. doing.

In this state, the elastic member 24 is urged to pull the keyboard lid 10 to the rear side, and when the keyboard lid 10 is opened, the front guide shaft 11B is the guide groove 21 as shown in FIG. When the rear side of the tip groove portion 21A and the rear guide shaft 12A are moved to the rear side of the guide recess 21BA, respectively, the keyboard lid 10 starts to move to the rear side by the urging force of the elastic member 24.

Then, when the keyboard lid 10 moves to the rear side until the state shown in FIG. 4, the urging force of the elastic member 24 urges the keyboard lid 10 to the front side, but the weight of the rear lid 12 is the weight of the keyboard lid 10. As shown in FIG. 5, the keyboard lid 10 itself continues to move further to the rear side.

As the keyboard lid 10 moves to the rear side, the force of its own weight for moving the keyboard lid 10 to the rear side by the rear lid 12 and the like increases, but the force of its own weight increases. As the size increases, the urging force of the elastic member 24 for urging the keyboard lid 10 to the front side also increases, so that the backward movement of the keyboard lid 10 can be smoothly performed at a substantially constant speed. There is.

Then, as shown in FIGS. 5 and 6, the guide groove 21 includes an ascending inclined portion 21C on the rear side of the guide groove 21 (rear side of the horizontal groove portion 21B), and as shown in FIG. When the keyboard lid 10 is opened, the rear guide shaft 12A climbs the ascending inclined portion 21C, so that the momentum when the keyboard lid 10 is stored in the musical instrument case is attenuated.

Further, as shown in FIG. 5, the guide groove 21 (horizontal groove portion 21B) includes the downward inclined portion 21D on the rear side of the apex of the upward inclined portion 21C, and the keyboard lid 10 is completely opened. When the rear guide shaft 12A is located on the rear side of the apex of the ascending inclined portion 21C, the keyboard lid 10 is prevented from moving in the closing direction by itself.

As described above, according to the present embodiment, since the pinion gear or the like is not used for the mechanism for opening and closing the keyboard lid 10, the number of parts can be significantly reduced, and the rotating shaft 22 can be used for maintenance. Since it is only necessary to apply grease to (see Fig. 7), workability during maintenance is greatly improved.

Further, when the keyboard lid 10 is opened, the front guide shaft 11B moves to the rear side of the tip groove portion 21A in the guide groove 21, and the rear guide shaft 12A moves to the rear side of the guide recess 21BA, respectively, and then the elasticity of the elastic member 24. Since the keyboard lid 10 is automatically stored in the musical instrument case by the force and the load of the keyboard lid 10, the keyboard lid 10 can be easily opened.

In order to suppress the moving noise of the keyboard lid 10 when the keyboard lid 10 is opened, the front guide shaft 11B and the front guide shaft 11B and the keyboard lid 10 automatically move when the keyboard lid 10 is automatically moved by the elastic force of the elastic member 24 and the load of the keyboard lid 10. In the range of the guide groove 21 in which the rear guide shaft 12A moves, it is preferable to use the horizontal groove portion 21B so as not to provide a steep ascending and descending inclination.

Further, it is preferable to adjust the elastic force of the elastic member 24 so that the keyboard lid 10 moves at a substantially constant speed in consideration of the load of the keyboard lid 10 and the like.

Therefore, after the keyboard lid 10 starts to move automatically, the force (pulling force) applied to the opening side of the keyboard lid 10 is 0.8 kgf or less, and the average pulling force (average value) when the keyboard lid 10 is moved. It is preferable to set the elastic force of the elastic member 24 so that the fluctuation range of the force applied to the opening side of the keyboard lid 10 is within about ± 0.4 kgf.

By doing so, the speed at which the keyboard lid 10 opens is not too fast, so that moving noise and the like can be suppressed, and since it is not too slow, the time required for the keyboard lid 10 to open becomes too long. Since the opening speed of the keyboard lid 10 is almost constant, the appearance when the keyboard lid 10 is opened can be improved.

By the way, in the present embodiment, as shown in FIG. 7, in the bent portion for connecting to the horizontal groove portion 21B on the rear side of the tip groove portion 21A, the step portion over which the front guide shaft 11B gets over when the keyboard lid 10 is opened. A 21AA is provided, and if the user lifts the keyboard lid 10 so as to get over the step 21AA, the keyboard lid 10 is automatically moved to open thereafter.

When the step portion 21AA is provided in this way, when the keyboard lid 10 is opened, when the front guide shaft 11B gets over the step portion 21AA, the tip groove portion 21A is provided so as not to put a load on the user. It is preferable to arrange an elastic member that biases the front guide shaft 11B upward at the lower end portion.

If such an elastic member is arranged, the impact when closing the keyboard lid 10 is also absorbed, so that the keyboard lid 10 can be closed quietly.

Although the present invention has been described above based on specific embodiments, the present invention is not limited to the above embodiments, and the technical scope of the present invention is within the range in which the object of the present invention is achieved. It includes various modifications and improvements of the above, which is clear to those skilled in the art from the description of the scope of claims.

The inventions described in the claims originally attached to the application of this application are added below. The claims in the appendix are as specified in the claims originally attached to the application for this application.
<Claim 1>
With the keyboard lid,
A side wall portion having a guide groove for guiding the opening and closing of the keyboard lid, and
An arm member that has a connecting portion that connects to the keyboard lid and that rotates about a rotation axis when the keyboard lid is opened and closed.
A first arm portion regulated by the regulation portion on the side wall portion side is provided at one end, and a second arm portion that regulates the rotation of the arm member is provided at the other end and is pivotally supported by the rotation shaft. Elastic members and
With
The second arm portion is a keyboard instrument characterized in that it is locked in a locking hole provided in the arm member.
<Claim 2>
In the keyboard instrument according to claim 1,
The second arm portion has a bent portion that bends to the outside of the elastic member.
A keyboard instrument characterized in that the bent portion is locked in the locking hole.
<Claim 3>
In the keyboard instrument according to claim 1 or 2.
An engaging member that engages with a plurality of engaging protrusions provided on the rotating shaft and the side wall portion is provided.
A keyboard instrument characterized in that the regulating portion is located between the plurality of engaging protrusions, and the engaging member regulates the movement of the first arm portion.
<Claim 4>
In the keyboard instrument according to any one of claims 1 to 3.
The keyboard lid has an anterior lid and a posterior lid, and has an anterior lid and a posterior lid.
A front guide shaft that guides the opening and closing of the front lid,
A rear guide shaft that guides the opening and closing of the rear lid,
With
When the keyboard lid is opened, the front guide shaft moves to the rear side of the tip groove portion in the guide groove and the rear guide shaft moves to the rear side of the guide recess, respectively, and then the elastic force of the elastic member and the keyboard. A keyboard instrument characterized in that the keyboard lid is automatically stored in the musical instrument case by the load of the lid.
<Claim 5>
In the keyboard instrument according to claim 4.
The guide groove includes an ascending inclined portion on the rear side of the guide groove.
A keyboard instrument characterized in that when the keyboard lid is opened, the rear guide shaft climbs the ascending inclined portion, so that the momentum when the keyboard lid is stored in the musical instrument case is attenuated.
<Claim 6>
In the keyboard instrument according to claim 5.
A keyboard instrument characterized in that when the keyboard lid is opened, the rear guide shaft is located on the rear side of the apex of the ascending inclined portion.

1 Keyboard instrument 2 Keyboard part 10 Keyboard part 11 Front lid 11A Finger insertion bracket 11B Front guide shaft 12 Rear lid 12A Rear guide shaft 12B Guide member 12C Rotating shaft support member 12D Rotating shaft 20 Side wall 21 Guide groove 21A Tip groove 21AA Step 21B Horizontal groove 21BA Guide recess 21C Upslope 21D Downslope 22 Rotating shaft 22A Screw hole 23 Arm member 23A Shaft hole 23B Locking hole 23C Connecting part 24 Elastic member 24A Coil part 24B First arm part 24C No. 2 Arm part 24CA Bending part 25, 26 Engagement protrusion 25A Screw hole 27 Engagement member 27A Restriction part N screw

In order to achieve the above object, the keyboard instrument according to the embodiment of the present invention has a keyboard lid provided with a guide shaft and a side wall having a guide groove for guiding the movement of the guide shaft with the opening and closing of the keyboard lid. Department and
It has a connecting portion for connecting to the keyboard lid, and includes an arm member that rotates about a rotation axis when the keyboard lid is opened and closed. The arm member has a guide shaft that moves rearward from the first position. The position of the connecting portion with respect to the rotating shaft is determined so that the keyboard lid rotates in the opening direction due to the weight of the keyboard lid. In the guide groove, the guide shaft is in the first position. An ascending inclined portion that is higher in the rear than in the front is provided in the second position so that the momentum of the guide shaft moving backward is attenuated when the guide shaft moves to the second position in the rear. It is a feature.

Claims (6)

With the keyboard lid,
A side wall portion having a guide groove for guiding the opening and closing of the keyboard lid, and
An arm member that has a connecting portion that connects to the keyboard lid and that rotates about a rotation axis when the keyboard lid is opened and closed.
A first arm portion regulated by the regulation portion on the side wall portion side is provided at one end, and a second arm portion that regulates the rotation of the arm member is provided at the other end and is pivotally supported by the rotation shaft. Elastic members and
With
The second arm portion is a keyboard instrument characterized in that it is locked in a locking hole provided in the arm member. In the keyboard instrument according to claim 1,
The second arm portion has a bent portion that bends to the outside of the elastic member.
A keyboard instrument characterized in that the bent portion is locked in the locking hole. In the keyboard instrument according to claim 1 or 2.
An engaging member that engages with a plurality of engaging protrusions provided on the rotating shaft and the side wall portion is provided.
A keyboard instrument characterized in that the regulating portion is located between the plurality of engaging protrusions, and the engaging member regulates the movement of the first arm portion. In the keyboard instrument according to any one of claims 1 to 3.
The keyboard lid has an anterior lid and a posterior lid.
A front guide shaft that guides the opening and closing of the front lid,
A rear guide shaft that guides the opening and closing of the rear lid,
With
When the keyboard lid is opened, the front guide shaft moves to the rear side of the tip groove portion in the guide groove and the rear guide shaft moves to the rear side of the guide recess, respectively, and then the elastic force of the elastic member and the keyboard. A keyboard instrument characterized in that the keyboard lid is automatically stored in the musical instrument case by the load of the lid. In the keyboard instrument according to claim 4.
The guide groove includes an ascending inclined portion on the rear side of the guide groove.
A keyboard instrument characterized in that when the keyboard lid is opened, the rear guide shaft climbs the ascending inclined portion, so that the momentum when the keyboard lid is stored in the musical instrument case is attenuated. In the keyboard instrument according to claim 5.
A keyboard instrument characterized in that when the keyboard lid is opened, the rear guide shaft is located on the rear side of the apex of the ascending inclined portion.

Images