JP2001265346A - Key mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make assembly work easily and to make keys surely mountable and easily removable. SOLUTION: The key mounting structure mounts the key 2 freely turnably in a vertical direction by fitting pair of projecting shafts 4 formed at the opposite surfaces of a pair of pieces 3a of a key supporting section 3 disposed on a keyboard chassis 1 into mounting holes 5 on both flanks in the rear part of the key 2. First guide grooves 10 which introduce the projecting shafts 4 from the bottom end of the key 2 toward the mounting holes 5 and the second guide grooves 11 which introduce the projecting shafts 4 from the mounting holes 5 toward the rear end of the key 2 are formed on both flanks in the rear part of the key 2 of the structure described above. Then, in mounting the key 2, the projecting shafts 4 may be guided by the first guide grooves 10 and fitted into the mounting holes 5 by the mere operation of depressing the key 2 and therefore the ease assembly work of the key 2 and the sure mounting of the key 2 are possible and in removing the key, the key 2 may be easily removed by forcibly flaring a pair of pieces 3a and relatively moving the projecting shafts 4 by inserting the projecting shafts into the second guide grooves 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key mounting structure used for a keyboard device such as an electronic piano.

[0002]

2. Description of the Related Art In a keyboard device such as an electronic piano,
A plurality of keys are mounted on the keyboard chassis so as to be rotatable up and down. 5 and 6 are views showing an example of the key attachment structure. The keyboard chassis 1 is made of a synthetic resin, and a plurality of keys (white keys and black keys, but a black key will be described here) 2 are arranged in parallel on the upper part of the keyboard chassis 1 and assembled in a musical instrument case in this state. I have. On the keyboard chassis 1, a key support portion 3 (only one of the pieces is shown in FIG. 5) in which a pair of pieces 3a are opposed to each other is provided corresponding to the rear portion of each key 2. Protrusion shafts 4 are provided corresponding to each other on opposing surfaces of the pieces 3a in the portion 3 (only the surface on the far side is shown in the figure).

On the other hand, mounting holes 5 in which the respective protruding shafts 4 are fitted are provided on both sides (the front and back sides of the paper in FIG. 5) of the rear part (the left part in FIG. 5) of the key 2. In addition, guide grooves 6 extending from the mounting holes 5 to the lower rear end of the key 2 are provided. in this case,
The guide groove 6 has a horizontal portion 6a extending substantially horizontally rearward from the mounting hole 5 and an inclined portion 6b extending obliquely downward from the rear portion of the horizontal portion 6a. The front end (the right end in FIG. 5) of the key 2 contacts a lower limit stopper (not shown) provided on the keyboard chassis 1 when the key is pressed, and an upper limit stopper provided on the keyboard chassis 1 when the key is released. A stopper piece 7 is provided in contact with a key (not shown), and a switch pressing portion 8 for pressing a switch (not shown) provided on the keyboard chassis 1 is provided at an intermediate portion of the key 2. ing.

[0004]

By the way, in such a key mounting structure, when the key 2 is mounted on the keyboard chassis 1, first, as shown in FIG. The projection shaft 4 is positioned above the front side of the projection shaft 4 (upper right side in the figure), and in this state, the key 2 is moved obliquely downward toward the rear, so that the projection shaft 4 becomes the inclined portion 6 b of the guide groove 6 of the key 2. Relative to. In this state, when the key 2 is further moved obliquely downward toward the rear, the projection shaft 4 relatively moves along the inclined portion 6b of the guide groove 6. Then, as shown in FIG. 6, when the projection shaft 4 is located at the boundary between the inclined portion 6b of the guide groove 6 and the horizontal portion 6a,
When the key 2 is moved substantially horizontally toward the rear, the projection shaft 4
Moves relatively along the horizontal portion 6a of the guide groove 6,
As a result, the projection shaft 4 is fitted into the mounting hole 5, and the projection shaft 4
The key 2 is attached so as to be rotatable up and down around the center.

However, in such a key mounting structure, as described above, after the key 2 is moved obliquely downward toward the rear and then substantially horizontally toward the rear, the projection shaft 4 must be moved. Cannot be fitted in the mounting hole 5 of the key 2 and the key 2 cannot be mounted on the key support portion 3. Therefore, there is a problem that the work of assembling the key 2 is complicated, time-consuming, and time-consuming.

SUMMARY OF THE INVENTION An object of the present invention is to make it easy to assemble, to attach a key securely, and to easily remove the key.

[0007]

According to the present invention, there is provided a key chassis in which a pair of pieces are opposed to each other on a keyboard chassis, and a key support is formed on each of the pieces to form a projection shaft for attaching a rear part of the key. A pair of mounting holes are formed on both sides of the key so as to face each other, and the pair of projection shafts are fitted into the mounting holes of the key respectively, whereby the key is vertically moved around the pair of projection shafts. In a key mounting structure rotatably mounted, a first groove for guiding the protruding shaft from a lower end located below the mounting hole toward the mounting hole is provided on both side surfaces of a rear portion of the key; And a second groove for guiding the projection shaft toward the rear end of the key.

According to the present invention, when the key is attached to the keyboard chassis, the first groove at the rear of the key is made to correspond to the upper part of the projection shaft of the key support portion, and when the key is pressed down in this state, the projection shaft becomes the second projection. Since the guide shaft is relatively guided along the one groove and fits into the mounting hole of the key, the projection shaft can be guided by the first groove and fitted into the mounting hole of the key only by pressing down the key,
For this reason, the assembling work is simple and the key can be securely attached. When removing the key, the pair of pieces of the key support portion are pushed open to insert the projection shaft into the second groove, and in this state, the key is removed. Is moved forward, the projection shaft is guided along the second groove and moves relatively to the rear end of the key, so that the key can be easily removed.

In this case, as described in claim 2, when the projection shaft is fitted in the mounting hole, the amount of the projection shaft biting into the first groove is reduced by the projection shaft biting into the second groove. When the projection shaft is pulled out from the mounting hole by pushing and expanding the pair of pieces of the key support portion by being larger than the amount, the projection shaft may be disengaged from the first groove because the projection shaft bites into the first groove. Therefore, the protrusion shaft can be easily extracted from the second groove having a small bite amount. As described in claim 3, the first groove is formed so as to be inclined such that its lower end side is deeper and gradually becomes shallower toward the mounting hole side, and the second groove is formed with a substantially constant depth. Thus, when the projection shaft relatively moves along the first groove, the projection shaft moves while elastically deforming in a direction of pushing and expanding the pair of pieces of the key support portion by the inclined first groove. The projecting shaft can be smoothly guided into the mounting hole, and when the projecting shaft is pulled out from the mounting hole, the pair of pieces of the key support portion are pushed out according to the depth of the second groove, so that the state is maintained. Thus, the projection shaft can be smoothly guided to the rear end side of the key along the second groove.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a key mounting structure according to the present invention will be described below with reference to FIGS. The same parts as those in the conventional example shown in FIGS. 5 and 6 are denoted by the same reference numerals and described. This key mounting structure has a first guide groove 10 and a second guide groove 1
1 and the other structure is almost the same as the conventional example. That is, the first guide groove 10 of the key 2 is
As shown in FIG. 1, the key 2 is formed substantially vertically from the lower end of the key 2 located below the mounting hole 5 to the mounting hole 5. The first guide groove 10 has a width substantially equal to the outer diameter of the mounting hole 5, and the depth thereof is as shown in FIG.
As shown in the figure, the lower end is formed so as to be deep, and the upper side located at the side of the mounting hole 5 is formed so as to be gradually shallow.

In this case, the depth of the lower end of the first guide groove 10 is substantially the same as the length of the projection shaft 4 as shown in FIG. Thereby, the first guide groove 1
The width at the position corresponding to the lower end portion of 0, that is, FIG.
The width W1 between the bottoms of the first guide grooves 10 in the width direction of the key 2 shown in (a) is substantially the same as the interval H1 between the projection shafts 4 provided on the pair of pieces 3a of the key support 3 so as to face each other. It is formed in a size (W1 ≒ H1). The depth of the first guide groove 10 at the position located at the edge of the mounting hole 5 is the key 2
Is formed almost as shallow as the outer surface of. Thus, the width at this point is formed to be substantially the same as the width W of the key 2. For this reason, when the projection shaft 4 is fitted into the mounting hole 5 of the key 2, the bite K 1 of the projection shaft 4 with respect to the first guide groove 10 is substantially the same as the projection length of the projection shaft 4. The width W of the key 2, that is, the interval between the two side surfaces of the key 2 is formed to be substantially the same length (W ≒ H 2) as the interval H 2 between the opposing surfaces of the pair of pieces 3 a in the key support 3.

As shown in FIG. 1, the second guide groove 11 is formed to bend from the mounting hole 5 toward the lower end of the rear portion of the key 2. That is, the second guide groove 11 is substantially horizontally extended from the mounting hole 5 toward the rear.
And an inclined portion 11b extending obliquely downward from the rear portion of the horizontal portion 11a. As shown in FIG. 2B, the depth of the second guide groove 11 is substantially constant.

In this case, the depth of the second guide groove 11 is smaller than the depth of the lower end of the first guide groove 10 and is larger than the depth of the upper end of the first guide groove 10 located on the mounting hole 5 side. It is deeply formed. Thereby, the width W2 between the bottoms of the second guide grooves 11 is smaller than the width W of the key 2 (W2 <W), as shown in FIG. Greater than the width W1 between the bottoms (W
1 <W2 <W). For this reason, when the projection shaft 4 is fitted into the mounting hole 5 of the key 2, the amount of engagement of the projection shaft 4 is equal to the amount of engagement K of the projection shaft 4 with respect to the first guide groove 10.
It is set to be smaller than 1 and within the limit of the elastic deformation of each piece 3a when the pair of pieces 3a of the key support portion 3 is expanded.

In such a key mounting structure, when mounting the key 2 on the keyboard chassis 1, as shown in FIG. 1, the rear part of the key 2 is arranged above the key support portion 3, and in this state, the key 2
When the key 2 is pressed down in the vertical direction with the first guide groove 10 corresponding to the projection shaft 4 of the key support 3, the first guide groove 10
, The projection shaft 4 is relatively inserted. At this time, as shown in FIG. 3, the interval H1 between the pair of projection shafts 4 and the width W1 at the lower end of the first guide groove 10 of the key 2 are almost the same length (W1 ≒ H1), so that the first The projection shaft 4 can be easily and reliably inserted into the guide groove 10.

In this state, when the key 2 is depressed at once in the vertical direction, the protruding shaft 4 moves relatively upward along the first guide groove 10 and fits into the mounting hole 5. At this time, the first guide groove 10 is formed so as to be inclined so that the lower end of the first guide groove 10 is deeper and the upper side thereof is gradually shallower, so that the projection shaft 4 guides along the first guide groove 10. Then, the pair of pieces 3a of the key support 3 are gradually elastically deformed in a direction in which the pieces 3a are pushed and spread. As a result, the projection shaft 4 smoothly moves in the first guide groove 10 and fits into the mounting hole 5 of the key 2. Further, at this time, since the key 2 is pushed down at once, it is possible to prevent the pair of pieces 3a of the key support 3 from being cracked or whitened due to elastic deformation.

In this way, the projection shaft 4 can be guided by the first guide groove 10 and fitted into the mounting hole 5 of the key 2 simply by pushing down the key 2 from above, so that the assembling work can be performed. The key 2 can be easily and securely attached. In this state, the key 2 is attached so as to be rotatable up and down around the projection shaft 4, so that the key can be pressed well. In this case, when the key 2 rotates about the projection shaft 4 when the key is pressed, a pushing force acts on the rear portion of the key 2, and this pushing force is applied in a direction to pull the projection shaft 4 out of the first guide groove 10. The amount of penetration K1 of the projection shaft 4 into the first guide groove 10 is substantially the same as the projection length of the projection shaft 4,
Since the projection shaft 4 is sufficiently secured, the first guide groove 1
It is possible to reliably prevent escape from zero.

Further, in this key mounting structure, when the key 2 is removed, the pair of pieces 3a of the key
Is pulled forward, the protrusion shaft 4 is inserted into the second guide groove 11. At this time, since the amount of protrusion of the protrusion shaft 4 into the second guide groove 11 is smaller than the amount of protrusion K1 of the protrusion shaft 4 into the first guide groove 10, the protrusion shaft 4 is easily and reliably inserted into the second guide groove 11. Can be done. When the key 2 is moved forward (to the right in FIG. 1) in this state, the protruding shaft 4 moves relatively toward the rear end of the key 2 along the second guide groove 11. At this time, since the second guide groove 11 is formed with a substantially constant depth, the pair of pieces 3a of the key support portion 3 are
The projection shaft 4 can be smoothly moved along the second guide groove 11 while the projection shaft 4 is pushed and spread by the biting amount of the projection shaft 4 with respect to the key 2.
Can be removed from.

[0018]

As described above, according to the present invention, a pair of projecting shafts formed on a pair of opposing surfaces of a pair of pieces in a key support portion provided on a keyboard chassis are attached to both sides of a rear portion of the key. In a key mounting structure in which a key is rotatably mounted in a vertically rotatable manner around a pair of projection shafts by fitting into a pair of mounting holes formed in Since the first groove for guiding the protruding shaft from the lower end located below to the mounting hole and the second groove for guiding the protruding shaft from the mounting hole toward the rear end of the key are formed, when mounting the key, The first groove of the key is made to correspond to the upper part of the projection shaft of the key support portion, and in this state, the operation of simply pressing down the key guides the projection shaft relatively along the first groove and fits the key into the mounting hole of the key. Key assembly work is simple and reliable. It can be attached to key in,
When removing the key, the pair of pieces of the key support portion are pushed open to insert the projection shaft into the second groove. When the key is moved forward in this state, the projection shaft is guided along the second groove. The key is moved relatively to the rear end of the key, so that the key can be easily removed.

In this case, in the state where the projection shaft is fitted into the mounting hole, the biting amount of the projection shaft into the first groove is larger than the biting amount of the projection shaft into the second groove. When the protruding shaft is pulled out from the mounting hole by pushing out, the protruding shaft bites into the first groove with a large amount, so that the protruding shaft does not come out of the first groove, and the protruding shaft has a small bite amount from the second groove. Can be easily extracted. Further, the first groove is formed so as to be inclined such that the lower end side is deeper and gradually becomes shallower toward the mounting hole side, and the second groove is formed at a substantially constant depth. When the relative movement is made, the projection shaft is moved by elastically deforming the pair of pieces of the key support portion in a direction to push and spread the pair of pieces of the key support portion by the inclined first groove, so that the projection shaft can be smoothly guided to the mounting hole. Yes, and when pulling out the projection shaft from the mounting hole,
By pushing and expanding the pair of pieces of the key support in accordance with the depth of the second groove, the projection shaft can be smoothly guided to the rear end side of the key along the second groove in that state.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a key is mounted on a key support in one embodiment of the key mounting structure of the present invention.

FIG. 2 shows a main part of the key of FIG. 1, and FIG.
FIG. 2B is an enlarged cross-sectional view taken along arrow BB in FIG. 1.

FIG. 3 is an enlarged cross-sectional view of a main part in a state where a first guide groove of the key is made to correspond to a projection shaft in FIG. 1;

FIG. 4 is an enlarged cross-sectional view of a main part in a state where the key is depressed in the state of FIG. 3 and the projection shaft is fitted into the mounting hole.

FIG. 5 is a side view showing a state in which a key is attached to a key support in a conventional key support structure.

FIG. 6 is a side view showing a state where the key is being attached to the key support in the conventional example of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Keyboard chassis 2 Key 3 Key support part 3a piece 4 Projection shaft 5 Mounting hole 10 First guide groove 11 Second guide groove

Claims (3)

[Claims] 1. A key support portion having a pair of pieces opposed to each other on a keyboard chassis, and a projection shaft for attaching a rear portion of the key is provided on both of the pieces, and a pair of mounting holes is provided on both side surfaces of the rear portion of the key. Are formed so as to face each other, and the pair of projection shafts are fitted into the mounting holes of the key, respectively, so that the key is mounted so as to be rotatable vertically about the pair of projection shafts. In the structure, on both side surfaces of the rear part of the key, a first groove for guiding the protruding shaft from the lower end positioned below the mounting hole toward the mounting hole, and a lower part of the key rear end from the mounting hole. A second groove for guiding the protruding shaft toward the key mounting structure. 2. The method according to claim 1, wherein when the projection shaft is fitted in the mounting hole, a biting amount of the projection shaft into the first groove is larger than a biting amount of the projection shaft into the second groove. The key attachment structure according to claim 1. 3. The first groove is formed so as to be inclined such that a lower end side thereof is deeper and gradually becomes shallower toward the mounting hole side.
3. The key attachment structure according to claim 1, wherein the groove is formed at a substantially constant depth.