JPS5850360Y2 - Keyboard lid opening/closing device for keyboard instruments - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a keyboard lid opening/closing device for a keyboard instrument such as a piano.

As an example of a conventional keyboard lid opening/closing device for, for example, a grand piano, one constructed as shown in FIGS. 1 and 2 is known.

That is, mounting brackets 2 are attached to predetermined positions on the rear ends of both sides of the keyboard lid 1 with wood screws 3.

A pin 4 is implanted in the mounting bracket 2 at a position corresponding to the center of rotation for opening and closing the keyboard lid 1.

This pin 4 is removably supported by a substantially U-shaped recess 6 formed in a pin receiving fitting 5.

This pin holder 5 is attached to a predetermined position on the inner surface of both arms 7 of the grand piano with wood screws 8.

Thus, the keyboard lid 1 is opened and closed by rotation about the pin 4 as shown by the solid line and the two-dot chain line in FIG.

By the way, the keyboard lid 1 of such a grand piano
Since it is generally relatively heavy, a relatively large amount of force is required to open and close it, and especially when closing it, it may be difficult to resist the weight of the keyboard lid 1, or the hand supporting the keyboard lid 1 may accidentally slip. When the keyboard lid 1 suddenly closes due to its own weight, there is a risk of pinching and injuring fingers, which is not only dangerous but also difficult to close smoothly.

Further, in such a conventional keyboard lid opening/closing device, the keyboard lid 1 cannot be stably held in the open position, and therefore, there is a risk that the keyboard lid 1 may inadvertently fall down and close during performance. It was extremely dangerous.

For this reason, various devices have been devised and put into practical use to stably hold the keyboard lid 1 in the open position, but these conventional devices have a structure different from the above-mentioned keyboard lid opening/closing device. Therefore, there have been disadvantages in that the structure is not only complicated, but also the cost is increased, and the work of attaching and removing the keyboard lid 1 is complicated.

This invention was made in view of the above circumstances, and allows the keyboard lid to be opened and closed with relatively little force, and especially when closing, it can be done smoothly and safely, and the keyboard lid can be opened with a simple structure. The object of the present invention is to provide a keyboard lid opening/closing device for a keyboard instrument that can be locked in position, and the keyboard lid is closed against the force of a coil spring provided on the keyboard lid. Further, when the keyboard lid is in an open position, a protruding piece to which one end of the coil spring is attached is engaged with an engaging piece provided on a receiving bracket for supporting the keyboard lid so that it can be opened and closed. be.

An embodiment of this invention will be described below with reference to FIGS. 3 and 4.

In the figure, reference numeral 10 denotes a keyboard lid, and mounting fittings 11 are attached to predetermined positions at the rear ends of both sides of the keyboard lid using wood screws 12.

A shaft 13 is installed in this mounting bracket 11 at a position corresponding to the opening/closing rotation center of the keyboard lid 10, and is appropriately spaced from the shaft 13 toward the front end of the keyboard lid 10. A protruding piece 14 is integrally bent at a predetermined position.

A base end portion of an arm 15 made of a rectangular plate-shaped body having a predetermined length is rotatably attached to the shaft 13.

A coil spring 16 is provided between the tip of the arm 15 and the protruding piece 14.

The base end of the arm 15 is removably fitted and supported in a substantially U-shaped recess 18 formed in the upper part of the arm holder 17 so as not to rotate.

This arm holder 17 is attached to a predetermined position on the inner surface of the arm 19 with wood screws 20.

Note that the state shown by the solid line in FIG.
6 is the most contracted and is in an almost natural state.

When the keyboard lid 10 is closed from this state, the projecting piece 14 rotates together with the keyboard lid 10 in the counterclockwise direction in FIG. 3, the keyboard lid 10 is closed against the force of the coil spring 16, that is, while receiving a force from the coil spring 16 in a direction opposite to the closing direction. The occlusion position shown is reached.

At this time, the more the keyboard lid 10 is closed, the more the coil spring 16 expands.
The force exerted by the coil spring 16 on the keyboard lid 10 gradually increases, so that the closing operation of the keyboard lid 10 can be performed smoothly and safely with a relatively small force.

In this closed state, the keyboard lid 10 receives a force in the opening direction due to the force of the coil spring 16, but this force is canceled by the weight of the keyboard lid 10 itself, and therefore the keyboard lid 10 is stabilized in the closed state. Holds well.

On the other hand, when the keyboard cover 10 is opened from this closed state, the keyboard cover 10 is opened while receiving a force in the opening direction due to the force of the coil spring 16, and reaches the open position shown by the solid line in FIG.

In this embodiment, when removing the keyboard lid 10, first put the keyboard lid 10 in the open state shown by the solid line in FIG.
Then, in this state, lift the keyboard lid 10 and use the arm 15.
The base end portion of the arm holder 17 is pulled out from the recess 18 of the arm holder 17 to be removed.

On the other hand, when attaching the keyboard lid 10 that has been removed in this manner, the above-mentioned removal operation is reversed.

Furthermore, if the coil spring 16 is configured to have a surplus force to further contract in the open state shown by the solid line in FIG. 3, the keyboard cover 10 can be biased toward the opening direction by this force. Therefore, the keyboard lid 10 can be stably held in the open position.

Furthermore, if the arm holder 17 is configured as shown in FIG.
1 is integrally formed in a protruding manner to form the keyboard lid 10 as described above.
If the projecting piece 14 is engaged with the locking piece 21 when the keyboard is in the open position, the keyboard cover 10 can be locked in the open position, and therefore the keyboard cover 10 can be held in the open position extremely stably. can be retained.

In this embodiment, when closing the keyboard lid 10, first lift the keyboard lid 10 slightly as shown in FIG. It is closed.

On the other hand, when opening the keyboard lid 10, it can be done by performing the operation opposite to the opening operation described above.

In the above embodiments, the case where this invention is applied to a grand piano has been described, but the present invention is not limited to this, and of course can be widely applied to, for example, an upright piano or an electric piano.

As explained in detail above, according to the keyboard lid opening/closing device for a keyboard instrument according to this invention, since the keyboard lid is configured to be closed against the force of a coil spring provided on the keyboard lid, the keyboard The closer the lid is closed, the more the force exerted by the coil spring on the keyboard lid can be gradually increased. Therefore, the keyboard lid can be opened and closed with relatively little force, and especially when closing is smooth. This can be done easily and safely, and the keyboard cover can be removed together with the coil spring from its holder, so that even though the coil spring is provided, the keyboard cover can be attached and detached in the same manner as before.

Further, if the protruding piece to which one end of the coil spring is attached is engaged with the retaining piece provided on the receiving bracket when the keyboard cover is in the open position, the keyboard cover can be moved to the open position with a simple structure. Therefore, accidents such as the keyboard lid falling down and closing during performance are completely eliminated, and even with this structure, the keyboard lid can be easily attached and removed. It has the effect of

[Brief explanation of drawings]

Fig. 1 is a partial side view showing an example of a keyboard lid opening/closing device in a conventional grand piano; Fig. 2 is an exploded perspective view thereof;
Fig. 3 is a side view of the main parts showing one embodiment of the keyboard lid opening/closing device according to this invention, Fig. 4 is an exploded perspective view thereof, and Fig. 5 is a side view of the main parts showing another embodiment of this invention. , FIG. 6 is a side view shown for explaining its operation. 10...Keyboard lid, 11...Mounting bracket,
13...Shaft, 14...Protrusion piece, 15...
... Arm, 16 ... Coil spring, 17 ... Arm holder, 21 ... Engagement piece.

Claims (2)

[Scope of utility model registration request] (1) An arm provided so as to be relatively rotatable at the rear end of the side surface of the keyboard lid, a coil spring provided between this arm and a predetermined location on the keyboard lid, and a predetermined location on the keyboard instrument body. and an arm holder provided at a location that supports the arm so as not to rotate, and the keyboard lid is configured to be closed against the force of the coil spring. A keyboard lid opening device for a keyboard instrument. (2) A projecting piece to which one end of the coil spring is attached is provided at the rear end of the side surface of the keyboard lid, and a retaining piece is provided at a predetermined location of the arm holder, and this engaging piece 2. The keyboard lid opening/closing device for a keyboard instrument according to claim 1, wherein the keyboard lid is locked in an open position by crossing over and engaging the protrusion.