JPH0634164B2 - Opening and closing mechanism for keyboard instruments - Google Patents

Description

The present invention relates to an opening / closing mechanism of a keyboard musical instrument used when opening / closing a music stand, a display panel of a musical instrument or the like, and an opening / closing body of a keyboard lid or the like, within the entire rotation angle range of the panel. By providing the first friction mechanism that applies the frictional resistance force and the second friction mechanism that applies the frictional resistance force only within the specific angle range, the panel can be rapidly moved within the specific angle range when the panel is opened and closed. This makes it easier to operate by eliminating unnecessary movements and increases the durability as a whole.

(Prior Art) As a conventional opening / closing mechanism for a keyboard instrument of this type, for example, an opening / closing device for a keyboard lid of a keyboard instrument is known.

The keyboard lid is rotatably supported on a time signature via pivots provided on both sides thereof, and an elastic body such as a torsion bar or a coil spring is attached to the pivot. That is, when the keyboard lid is closed, the force (weight of the keyboard lid) of the elastic body to be closed by the elastic force is reduced. This makes it soft,
You get a quiet closing action.

(Problems to be Solved by the Invention) However, in such a conventional switchgear,
Depending on the elastic body, the load always acts only in one direction (the direction to open the lid), so the load is maximum in the closed state, and a separate locking mechanism is required to keep the lid closed. There was a problem that it had become. Further, if the elastic force of the elastic body is set to be small, the lid will be closed abruptly, so that there is a problem that soft closing cannot be realized.

Therefore, the present invention provides a convenient opening / closing mechanism of a keyboard instrument in which the opening / closing operation is controlled by controlling the opening / closing operation, and the opening / closing mechanism of the keyboard musical instrument is provided in a predetermined angle range. The purpose of the present invention is to increase resistance to the opening / closing operation, prevent sudden opening / closing, and allow the apparatus to stand still, and further improve the durability of the apparatus itself.

(Means for Solving the Problems) That is, the present invention provides a first friction mechanism (21) and a second friction mechanism (21).
And a friction mechanism (31) of the keyboard instrument, the first friction mechanism (21) is a first friction member (3).
7, 39) is in sliding contact with the opening / closing body (27) or the main body (23) and exerts a constant frictional resistance against the rotation of the opening / closing body (11) within the entire rotation angle range. Yes,
The second friction mechanism (31) includes a second friction member (59, 6).
1) is brought into sliding contact with the opening / closing body (11) or the main body (9) and starts rotating with respect to the rotation of the opening / closing body (11) and then rotates by a certain angle, and then imparts a resistance force due to a certain friction. However, the opening / closing mechanism of the keyboard musical instrument is provided so as not to generate the resistance force within a certain angle range before the end of the rotation.

(Operation) In the opening / closing mechanism of the keyboard instrument according to the present invention, the opening / closing body can rotate with respect to the main body. The opening / closing body can be rotated within a predetermined angle range.

Here, the first friction mechanism applies a resistance force due to friction within the entire rotation angle range of the opening / closing body. That is, rotation is possible in both forward and reverse directions, and the resistance force acts in both cases.

Further, the second friction mechanism applies a frictional resistance force to the opening / closing body within a specific rotation angle range when the opening / closing body is rotated. Therefore, as a result of the frictional resistance increasing within this specific angle range, abrupt movement of the opening / closing body is restricted within this angle range. For example, the opening / closing body can be stopped halfway.

Then, outside the specific angle range, only a small force acts on the opening / closing body, and a mechanism for locking the opening / closing body with respect to the main body may be unnecessary depending on the setting of the frictional resistance force. Further, the power switch of an electric musical instrument or the like can be turned on and off by the opening / closing body.

Furthermore, since the resistance force is dispersed and received by the two friction mechanisms, the durability of the entire device is improved.

(Example) Hereinafter, the Example of this invention is described based on drawing.

1 to 10 (A), (B), (C) and (D) show an embodiment of an opening / closing mechanism of a keyboard musical instrument according to the present invention.

As shown in FIG. 2 to FIG. 4, (1) is a portable electronic keyboard musical instrument (keyboard), and this electronic keyboard musical instrument (1) is a main body in which a plurality of keys (3) are arranged in a line. It has (5). The box-shaped main body (5) includes a resin lower case (7) containing a key switch and the like, and a resin upper case (9) disposed on the lower case (7). have. Both sides of the upper case (9) (1
0) are arranged at both ends of the keys (3) in the arrangement direction, and a cover (11) which is a keyboard lid and a music stand is rotatably supported on this portion (10). Note that (13)
Is a power switch arranged on the upper surface of one side portion (10) of the upper case (9).

The cover (11) is formed in a plate shape with a predetermined thickness so as to cover the keyboard from above. This cover (11) is an opening / closing body. The opening / closing body (cover) (11) is rotatably supported on the upper case (9) of the main body (5) by an opening / closing device.

Here, as shown in FIGS. 1 and 5 to 7, the opening / closing device has a resistance force due to friction within the entire rotation angle range with respect to the rotation of the opening / closing body (cover) (11). First to give
The friction mechanism (21) and the second friction mechanism (31) that imparts a resistance force due to friction within a specific rotation angle range with respect to the rotation of the opening / closing body (11). .

That is, in these figures, the first friction mechanism (21) is provided at the uppermost portion of the vertical bracket (23) fixed to the upper case (9), and the holding member (2) is also provided at the lowermost portion thereof.
The second friction mechanisms (31) are respectively arranged via 5).

The cover (11) is fixed to the rotating plate (27), and the rotating plate (27) is rotated by a bolt (33) and a nut (35) on the vertical bracket (23) through its vertical portion (29). It is movably tightened and connected. FIG. 9 shows this coupling, that is, the first friction mechanism (21).
As shown in this figure, a metal circular plate (37) is inserted between the vertical portion (29) and the vertical bracket (23), and the circular plate (39) of the same shape and a thin washer are used. The bolts (33) and the nuts (35) are tightened by a predetermined tightening force via (41) and (43). Therefore, the vertical part (29) and the circular plates (37), (3
A predetermined frictional force will act between 9). In this case, the bolt (33) serves as the rotation center axis of the rotation plate (27), that is, the cover (11). Further, the bolts (33) and the nuts (35) are firmly joined by an adhesive after fastening to prevent loosening.

On the other hand, the vertical bracket (23) is formed with an arc groove (45) having a predetermined width with the bolt (33) as the center of curvature over a predetermined angle range (see FIG. 5). The arcuate groove (45) sets the rotation angle range of the cover (11). That is, the horizontal portion (47) of the rotating plate (27)
A rod-shaped restricting member (49) fixed to the lower surface horizontally projects and is loosely inserted in the arc groove (45), and when the cover (11) rotates, the restricting member (49) also integrally forms the arc groove (45). The inside is rotated along this.

The tip end portion of the regulating member (49) protruding from the arc groove (45) has a base end portion which is attached to the holding member (25) by a bolt (5).
1), a lever (55) rotatably supported by a nut (53) is loosely inserted in a long groove (57) formed linearly along the extending direction of the tip of the lever (55). Therefore, when the regulating member (49) rotates in the arc groove (45) with the rotation of the rotating plate (27), the tip end part thereof reciprocates in the long groove (57) to move the lever (55). It is rotated within a predetermined angle range. In this case, the bolt (51) and the nut (53) for tightening the lever (55) and the holding member (25) with the circular plates (59) and (61) and the washers (63) and (65) sandwiched are , The second friction mechanism (3
1) is constituted (see FIG. 8). Also in this case, a predetermined resistance force due to the friction acts on the rotation of the cover (11) within a specific angle range.
Further, the bolt (51) and the nut (53) are prevented from loosening by an adhesive after they are fastened.

It should be noted that one end portion (57A) in the extending direction of the long groove (57) formed in the lever (55) is formed to be recessed, which facilitates the movement of the regulating member (49).

Next, the operation of this embodiment will be described mainly with reference to FIGS. 10 (A), (B), (C) and (D).

10 (A) to (D) schematically show the cover (11) from a closed state to an opened state.

That is, when the cover (11) is closed, as shown in FIG. 10 (A), the restricting member (49) moves the arcuate groove (4).
5), which is located at the end of the circular groove (4).
It is located approximately tangential to 5).

Then, when the cover (11) is slightly opened, the tenth
As shown in FIG. (B), the regulating member (49) has an arc groove (4
It is guided to 5) and descends to a predetermined position. However, as a result of the lever (55) hardly rotating, the frictional resistance force in the second friction mechanism (31) hardly occurs. Therefore, the frictional resistance force of the first friction mechanism (21) acts as a resistance force against the rotation of the cover (11).
That is, the vertical portion (29) of the rotating plate (27) rotates under a predetermined frictional force between the rotating plate (27) and the circular plates (37) and (39). It is constant within the angular range.

Further, as shown in FIG. 10 (C), the cover (11)
When is rotated, the lever (55) is rotated by the restriction member (49) within the specific angle range, and the second friction mechanism (31) is rotated.
As a result, a predetermined frictional resistance force is added. That is, the lever (5
5) When the lever (55) rotates, a resistance force against the rotation of the lever (55) acts due to the frictional force acting between the lever (55), the circular plate (59) and the holding member (25). It is a thing. As a whole, within this specific angle range, the resistance force gradually increases and then gradually decreases.

Finally, the cover (11) is rotated and opened to the position shown in FIG. 10 (D). Also in that case, the frictional resistance force is applied only from the first friction mechanism (21). The point that the lever (55) is positioned tangentially to the circular arc groove (45) is the same as the rotation start state.

On the contrary, the resistance acts similarly from the opened state to the closed state. That is, 1 from the start of opening and closing
The resistance to the rotation is small at about 0 degrees, but gradually increases after that, becomes gradually smaller after passing the peak, and then becomes light again at about 10 degrees at the end.

Therefore, in this embodiment, only the last first friction mechanism (21) acts so as not to hurt when a finger is caught when the cover (11) is closed. In addition, the size of the lever (55) with respect to the circular arc groove (45) and the position of the rotation center (51) are vertically displaced or arranged laterally, so that the second friction mechanism (31) is moved within a specific angle range. ) Can be activated. Further, in these friction mechanisms, the frictional resistance can be easily set by adjusting the tightening force between the bolt and the nut. The power switch (13) can be turned on and off by using the weight of the cover.

(Effects) As described above, in the opening / closing mechanism of the keyboard instrument according to the present invention, the opening / closing body rotates in both forward and reverse directions, but the resistance force to this acts in both cases. . Further, abrupt movement of the opening / closing body is restricted within the specific angle range. For example, it can be stationary. Then, outside the specific angle range, only a small force acts on the opening / closing body, and a mechanism or the like for locking the opening / closing body may be unnecessary. Furthermore, the durability of the opening / closing mechanism is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing an essential part of a switchgear according to an embodiment of the present invention, and FIG. 2 is a partially cutaway view showing a keyboard instrument according to an embodiment of the present invention. A plan view, FIG. 3 is a front view showing a keyboard musical instrument according to one embodiment, FIG. 4 is a side view showing a keyboard musical instrument according to one embodiment, and FIG. 5 is a view of an opening / closing device according to one exemplary embodiment. 6 is a front view showing a main part of a switchgear according to one embodiment, FIG. 7 is a bottom view showing a main part of a switchgear according to one embodiment, and FIG. FIG. 9 is an exploded view showing a second friction mechanism of the switchgear according to one embodiment, FIG. 9 is an exploded view showing a first friction mechanism of the switchgear according to one embodiment, and FIGS. FIG. 6D is a schematic view showing the operation of the switchgear according to the embodiment. (9) ... Upper case (main body), (11) ... Cover (opening / closing body), (21) ... First friction mechanism, (31) ... Second friction mechanism.

Claims (2)

[Claims] 1. An opening / closing mechanism for a keyboard instrument having a first friction mechanism (21) and a second friction mechanism (31), wherein the first friction mechanism (21) is a first friction member. (37,3
9) slidingly contacts the opening / closing body (27) or the main body (23),
With respect to the rotation of the opening / closing body (11), a constant frictional resistance force is exerted within the entire rotation angle range, and the second friction mechanism (31) includes the second friction member (59, 6
1) is in sliding contact with the opening / closing body (11) or the main body (9), and starts to rotate with respect to the rotation of the opening / closing body (11), and after a certain angle of rotation, imparts a resistance force by constant friction. However, the opening and closing mechanism of the keyboard instrument prevents the resistance force from being generated within a certain angle range before the end of rotation. 2. The second friction mechanism (31) includes a restriction member (4).
The second friction member (59, 61) is restricted so as to exert a resistance force due to friction only within a certain rotation angle range of the opening / closing body (11). An opening / closing mechanism for a keyboard instrument according to item 1.