JP2022038585A - Action configuration of toy piano - Google Patents

Abstract

To provide an action configuration of a toy piano capable of suppressing rattling and bound of a turning hammer while securing smooth turning of the hammer in association with the pressing of a key, and preventing the generation of vibration and noise caused thereby.SOLUTION: An action configuration of a toy piano including a hammer 4 turning in association with the pressing of a swingable key 11 extending in a front-back direction includes: a spindle 12b provided in a rear end of the key 11, extending in a left-right direction, and having a circular cross section; an engaging receiving part 24 provided in the hammer 4 in a recessed state, and engaged with the outer peripheral surface of the spindle 12b in a slide contact state; and an energization support part 26 provided in the hammer 4, coming into slide contact with the outer peripheral surface of the spindle 12b in a state of energizing the spindle 12b to an engaging receiving part 24 side, and supporting the spindle 12b in cooperation with the engaging receiving part 24. The hammer 4 turns around the spindle 12b due to the rise of the spindle 12b together with the rear end of the key 11 in association with the swinging of the key 11 in a front-low inclined direction at the time of pressing the key 11.SELECTED DRAWING: Figure 2

Description

The present invention relates to an action structure of a toy piano, and more particularly to a rotation mechanism of a hammer that rotates in conjunction with a key press.

Conventionally, as an action structure of this kind of toy piano, for example, one disclosed in Patent Document 1 already filed by the present applicant is known. This toy piano is a grand type and is equipped with a wooden case having a predetermined outer shape, a keyboard provided at the front of the case, and a sounding device that emits a sound when the keyboard is operated. ing. The keyboard is composed of a plurality of keys, each of which extends in the front-rear direction and is swingably configured with the vicinity of the center in the length direction as a fulcrum. The sounding device includes a plurality of hammers and sounding bodies provided for each key, and a hammer as an action structure that operates with the key being pressed is rotatably connected to the rear part of the key to correspond to the sounding body. It is designed to make a sound by hitting from below.

The above hammer is provided with two horizontally protruding support shafts on the rear side of the protruding claw at the front end, while both support shafts of the hammer are engaged with the key, both from the through hole. Two shaft holes are provided. When the key is pressed, the key swings forward and downward, so that both support shafts of the hammer are pulled up through both shaft holes of the key. Then, the protruding claw at the front end of the hammer abuts on the stopper from below to prevent the hammer from moving upward, whereby the hammer body at the rear end of the hammer rotates so as to rise, and the hammer body is rotated. Collides with the sounding body from below and hits it. This produces a sound corresponding to the pressed key.

Japanese Unexamined Patent Publication No. 2017-169705

In the above-mentioned toy piano, both the key and the hammer are made of a molded product of synthetic resin, and both support shafts of the hammer are directly inserted into both shaft holes of the key. In such a key-hammer connection structure, in order to smoothly rotate the hammer when the key is pressed, it is necessary to make the diameter of the shaft hole of the key slightly larger than that of the support shaft of the hammer. That is, the hammer is connected to the key with both support shafts loosely inserted into both shaft holes of the key.

However, in this case, during the rotation of the hammer, the support shaft of the hammer may rattle with respect to the shaft hole of the key, and noise may be generated due to the rattling. In addition, a small bounce when the hammer body of the hammer rotates upward and collides with the sounding body, and then when the hammer body rotates downward and returns to its original position and is placed on the cushion. Is likely to occur. When such a bounce occurs, vibration and noise are generated due to it. Therefore, there is room for improvement in the action structure of the conventional toy piano described above.

The present invention has been made to solve the above problems, and while ensuring smooth rotation of the hammer accompanying key pressing, it suppresses rattling and bouncing of the rotating hammer, and at the same time, it suppresses rattling and bouncing of the rotating hammer. It is an object of the present invention to provide an action structure of a toy piano capable of preventing the generation of vibration and noise due to them.

In order to achieve the above object, the invention according to claim 1 comprises a hammer that extends in the front-rear direction and swings around the center in the length direction as a fulcrum, and rotates with a key pressed. It is an action structure of a toy piano provided, which is provided at the rear end of a key, has a support shaft extending in a predetermined length in the left-right direction and having a circular cross section, and a support shaft having a concave shape on a hammer, and is provided on the outer peripheral surface of the support shaft. The engagement receiving part that engages in the sliding contact and the engagement receiving part that is provided on the hammer and has the support shaft urged toward the engaging receiving part, slides into the outer peripheral surface of the support shaft and cooperates with the engaging receiving part. It is equipped with an urging support part that supports the support shaft, and when the key is pressed, the support shaft rises together with the rear end of the key as the key swings forward and downward, so that the hammer can be lifted. It is characterized by rotating around a support shaft.

According to this configuration, as an action structure of a toy piano that operates when a key is pressed, a hammer rotatably connected to the rear end of the key is provided. The rear end of the key is provided with a support shaft extending in the left-right direction by a predetermined length and having a circular cross section. On the other hand, the hammer is provided with a concave engagement receiving portion and an urging support portion. When the key and the hammer are connected, the engagement receiving part of the hammer engages with the support shaft of the key in a state where it is in sliding contact with the outer peripheral surface of the support shaft, and the urging support part of the hammer receives the engagement. With the part urged, it slides into contact with the outer peripheral surface of the support shaft. In this way, the engaging receiving portion and the urging supporting portion of the hammer cooperate to support the support shaft of the key. Then, when the key is pressed, the hammer swings forward and downward, and the support shaft rises together with the rear end portion of the key, so that the hammer rotates about the support shaft. In this case, the hammer rotates while maintaining the state in which the engaging receiving portion and the urging support portion are in sliding contact with the outer peripheral surface of the support shaft of the key. It is possible to suppress the rattling and bouncing of the rotating hammer and prevent the generation of vibration and noise due to them.

The invention according to claim 2 is provided in the action structure of the toy piano according to claim 1, wherein the contact portion is provided on the hammer and is located in front of the engagement receiving portion, and is immovably provided in the toy piano. The hammer is further provided with an immovable portion with which the abutting portion abuts from below, and the hammer is configured to rotate about the abutment portion as a fulcrum while rotating about the support shaft when the key is pressed. It is characterized by that.

According to this configuration, the hammer is provided with a contact portion located in front of the engagement receiving portion, and this contact portion is in contact with the immovable portion in the toy piano from below. In this state, when the key is pressed, the support shaft at the rear end of the key rises, whereby the hammer rotates around the contact portion as a fulcrum and is centered on the support shaft with respect to the key. Rotate as. In this way, the hammer can be smoothly rotated around the rising support shaft when the key is pressed.

The invention according to claim 3 is provided in the action structure of the toy piano according to claim 1 or 2, which is provided on a hammer, has a dimension larger than the diameter of the cross section of the support shaft, and engages the support shaft with a receiving portion. Further provided with a mounting opening for engaging with, the urging support extends from the edge of the mounting opening toward the engaging receiving portion, and the support shaft is attached to the mounting opening when the hammer is attached to the key. When moving from the portion to the engaging receiving portion, it gradually bends greatly when pressed by the supporting shaft, and when the supporting shaft engages with the engaging receiving portion, the supporting shaft is urged by the restoring force based on the bending. It is characterized in that it is configured as follows.

According to this configuration, the hammer is provided with the above-mentioned mounting opening, and is provided with an urging support portion so as to extend from the edge portion of the mounting opening toward the engaging receiving portion. When attaching the key to the key of the hammer, when engaging the support shaft of the key with the engagement receiving part of the hammer, first insert the support shaft into the mounting opening and then insert the support shaft toward the engagement receiving part. Move it. In this case, the urging support portion gradually bends greatly when pressed by the support shaft, and when the support shaft engages with the engagement receiving portion, the restoring force based on the bending causes the support shaft to bend toward the engagement receiving portion side. To be urged to. The mounting opening provided in the hammer is larger than the diameter of the support shaft, and in addition, the urging support part functions as a guide when the support shaft is engaged with the engagement receiving part, so that the key can be used. The hammer can be easily attached. Further, since the urging of the support shaft by the urging support portion is performed by the restoring force based on the above-mentioned deflection of the urging support portion, the urging can be stably maintained for a long period of time.

The invention according to claim 4 is the action structure of the toy piano according to any one of claims 1 to 3, wherein a sounding body for emitting a predetermined sound according to a key is provided in the toy piano, and a hammer is provided. Is provided with a hammer main body located behind or below the engagement receiving portion, and is characterized in that the hammer rotates when the key is pressed and the hammer main body collides with the sounding body to produce a sound. And.

According to this configuration, the hammer rotates when the key is pressed, and the hammer body portion located behind or below the engagement receiving portion collides with the sounding body in the toy piano. As a result, the sounding body vibrates, and a sound corresponding to the scale of the pressed key can be generated.

The invention according to claim 5 is the action structure of the toy piano according to any one of claims 1 to 4, wherein the engaging receiving portion has an arcuate curved surface, and the radius of curvature of the curved surface is a fulcrum. It is characterized in that it is set larger than the radius of the cross section.

According to this configuration, the engaging receiving portion has an arcuate curved surface, and the radius of curvature of the curved surface is set to be larger than the radius of the cross section of the supporting shaft, so that the engagement receiving portion is engaged with the outer peripheral surface of the supporting shaft. The contact area with the joint receiving portion can be made smaller than the area of the entire curved surface of the engaging receiving portion. As a result, the friction between the support shaft and the engaging receiving portion can be reduced, and the smooth rotation of the hammer can be ensured.

It is a perspective view which shows the appearance of the grand type toy piano to which the action structure by one Embodiment of this invention is applied. (A) is a left side view showing the internal structure of the toy piano of FIG. 1, and (b) and (c) show disassembled hammers and keys, respectively. (A) is a left side view showing the appearance of the hammer in an enlarged manner, (b) is a view showing an enlarged support shaft engaging portion, and (c) is a support shaft and an urging support portion. It is a figure for demonstrating the positional relationship with. It is a figure for demonstrating the relationship between a support shaft and a biasing support part at the time of attaching a hammer to a key, (a) is a state before the support shaft engages with an engagement receiving part, (b) is a state. , The state after the support shaft is engaged with the engagement receiving portion is shown. It is explanatory drawing for demonstrating the operation of a hammer at the time of key pressing in order.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the appearance of a grand-type toy piano to which the action structure according to the embodiment of the present invention is applied, and FIG. 2A shows the internal structure of the toy piano. As shown in both figures, the toy piano 1 has a case 2 having a predetermined outer shape, a keyboard 3 provided at the front of the case 2, and a plurality of action structures that operate in association with a key press (FIG. 2). 2 (a) has only one hammer 4 (shown only one), and a plurality of sounding bodies 5 (only one is shown in FIG. 2 (a)) that emit a sound when the hammer body 22 described later of the hammer 4 hits from below. It is equipped with. The bottom surface of the case 2 is provided with four legs 1a having a predetermined length in the vertical direction (only two are shown in FIG. 1).

The case 2 has a bottom plate 2a having a predetermined planar shape and a cross-sectional shape, and a side plate 2b having a predetermined height and provided on the side of the bottom plate 2a so as to extend continuously along the edge thereof. , On the upper side of the keyboard 3, a horizontally long rectangular front stile 2c provided so as to connect the left and right sides of the front portion of the side plate 2b, and provided in a state of being placed on the upper ends of the side plate 2b and the front stile 2c. It is composed of a large roof 2d and the like. The above-mentioned parts of the case 2 are made of wood, synthetic resin, or the like.

As shown in FIG. 2A, on the bottom plate 2a of the case 2, a support rail 6 for swingably supporting each key 11 of the keyboard 3 and a support rail 6 in front of the support rail 6 (FIG. 2 (FIG. 2)). A key guide 7 provided for each key 11 is provided at a predetermined position on the right side of a).

The support rail 6 extends in the left-right direction (front and back directions in FIG. 2A), and its cross section is formed in a substantially triangular shape. Each key 11 is swingably supported by the support rail 6 with the top portion 6a of the upper end thereof as a fulcrum. On the other hand, the key guide 7 is formed in a plate shape that protrudes upward by a predetermined length and has a width substantially the same as the inner width of the key 11. By inserting the key guide 7 into the corresponding key 11 from below, the key 11 is guided in the vertical direction while preventing lateral vibration of the key 11 when the key is pressed.

Further, on the bottom plate 2a, a plurality of cushions 8 are provided on which the key 11 comes into contact with each other from above when the key is pressed or released. Specifically, the front cushion 8a is provided below the front end of the key 11 from the front side to the rear side (from the right side to the left side of FIG. 2) of the toy piano 1, and the middle cushion 8b is provided immediately in front of the key guide 7. Is provided, and a rear cushion 8c is provided below the rear end of the key 11. Further, on the bottom plate 2a, a hammer cushion 9 is provided behind the rear cushion 8c so that the hammer 4 in the key-released state abuts from above.

The keyboard 3 is composed of a plurality of keys 11 (32 in this embodiment) including white keys 11a and black keys 11b. The key 11 is made of synthetic resin, and as shown in FIGS. 2A and 2C, the key 11 extends in a predetermined length in the front-rear direction, and the cross section of the first half portion (the right half portion of FIG. 2A) has a cross section. It is formed in a U-shape that opens downward. Further, on the left and right side walls of the key 11, recesses 11c and 11c that open downward are formed near the center in the length direction, respectively, and the top portion 6a of the support rail 6 is downward in these recesses 11c and 11c, respectively. The key 11 is swingably supported in a state of being inserted from.

Further, the rear end portion of the key 11 is provided with a hammer connecting portion 12 extending upward by a predetermined length and to which the hammer 4 is connected. The hammer connecting portion 12 is formed in a U-shape that opens upward when viewed from the front (right side of FIGS. 2A and 2C) (one-dot chain line circle of FIG. 2C). (See inside), it has two left and right wall portions 12a, 12a facing each other with a predetermined interval, and a support shaft 12b extending horizontally in the left-right direction is provided at the upper ends of both wall portions 12a, 12a. There is. In FIG. 2A, for convenience of illustration, the wall portion 12a on the left side (front side in the front-back direction of FIG. 2A) is omitted.

The hammer 4 is made of a predetermined type of synthetic resin (for example, polypropylene) and has a predetermined side surface shape as shown in FIG. In the key release state, the hammer 4 is formed so as to be inclined and extended forward. The detailed configuration of the hammer 4 will be described later.

As shown in FIG. 2A, a hammer contact rail 14 (immovable portion) extending in the left-right direction is immovably provided above the hammer 4 in the case 2 of the toy piano 1. The hammer contact rail 14 extends in the left-right direction over all the hammers 4 arranged so as to be arranged in the left-right direction. Further, the hammer contact rail 14 is formed in a U-shape whose cross section is open upward. On the bottom surface 14a of the hammer contact rail 14, a sliding tape 15 for smoothly sliding the contact portion 27 described later of the hammer 4 to the bottom surface 14a is provided in the length direction (front and back directions in FIG. 2A). It is pasted. Further, the rear surface 14b of the hammer contact rail 14 is provided with a cushion 16 projecting rearward in the length direction (front and back directions in FIG. 2A).

The sounding body 5 is made of a metal pipe such as aluminum, extends by a predetermined length in the front-rear direction according to the scale of each key 11, and is arranged side by side in the left-right direction so as to correspond to all the keys 11. More specifically, the sounding body 5 has a length dimension that is long on the bass side and short on the treble side, and is provided for the same number of minutes as the key 11.

Here, the hammer 4 will be described in detail with reference to FIG. As shown in FIG. 3A, the hammer 4 is provided at an arm 21 extending forward (inward right in FIG. 3A) and extending at the lower end of the arm 21, and in an extending direction of the arm 21. It has a hammer body 22 that is substantially orthogonal to and projects diagonally upward. A support shaft engaging portion 23 that rotatably engages with the support shaft 12b of the key 11 is provided at a predetermined position of the arm 21, specifically, a predetermined position closer to the upper end than the central portion in the length direction. There is.

The support shaft engaging portion 23 is engaged with the engaging receiving portion 24 formed in a substantially semicircular concave shape and the edge portion of the mounting opening 25 opened diagonally downward (lower right in FIG. 3A). It extends toward the receiving portion 24 and has an urging support portion 26 that supports the support shaft 12b in cooperation with the engaging receiving portion 24. The mounting opening 25 is an opening into which the support shaft 12b is inserted when the hammer 4 is mounted on the hammer connecting portion 12 of the key 11 in the manufacturing process of the toy piano 1, and the diameter of the support shaft 12b. It has a larger opening size (see FIG. 4A).

The engagement receiving portion 24 has an arcuate curved surface, the radius of curvature of the curved surface is set to be larger than the radius of the cross section of the support shaft 12b, and a part of the curved surface is slid on the outer peripheral surface of the support shaft 12b. Engage in contact. On the other hand, the urging support portion 26 is formed so as to be connected to the lower edge portion of the mounting opening 25 and extend toward the engagement receiving portion 24. More specifically, as shown in FIG. 3B, the passage from the mounting opening 25 to the engaging receiving portion 24 is formed so that the width thereof is gradually narrowed by the urging support portion 26. Further, in the state before the support shaft 12b is engaged with the engagement receiving portion 24, the tip end portion of the urging support portion 26 is engaged with the engaging receiving portion 24 as shown in FIG. 3 (c). It is in a state of being slightly inside the virtual line (two-dot chain line) of the outer shape of the support shaft 12b, that is, in a state of slightly overlapping with the support shaft 12b.

Further, in front of the support shaft engaging portion 23 in the arm 21 of the hammer 4 (upper right in FIG. 3A), a contact portion 27 that is convexly curved upward and abuts on the hammer contact rail 14 from below is provided. It is provided. The contact portion 27 is formed wide in the left-right direction (front and back directions in FIG. 3A). Further, the arm 21 projects upward (upper left in FIG. 3A) from the vicinity of the support shaft engaging portion 23 to prevent further rotation of the hammer 4 that has rotated to a predetermined position when the key is pressed. The stopper 28 is provided.

Further, the hammer body 22 of the hammer 4 is formed so that the tip portion thereof protrudes in an arc shape. Further, a semicircular hollow portion 29 penetrating in the left-right direction is formed at a predetermined position near the tip of the hammer main body 22. By forming the cavity 29, the hammer body 22 has a soft portion 22a formed thinly between the tip surface of the hammer body 22 and the cavity 29, which is apparently softer than the hardness of the hammer body 22 itself. It is provided. By the hammer body 22 colliding with the sounding body 5 through the soft portion 22a, the time for the hammer body 22 to contact the sounding body 5 can be secured for a relatively long time, whereby the good from the sounding body 5 can be secured. It is possible to generate a sound of tone color.

FIG. 4 shows the relationship between the support shaft 12b and the urging support portion 26 when the hammer 4 is attached to the key 11. As shown in FIG. 3A, when the hammer 4 is attached to the support shaft 12b of the key 11, the support shaft 12b is inserted through the attachment opening 25 of the hammer 4 and is inserted into the engagement receiving portion. Move towards 24. In this case, the urging support portion 26 is pressed by the support shaft 12b and gradually bends greatly as shown by the arrow in the figure (a). Then, when the support shaft 12b reaches the engagement receiving portion 24 and engages with the support shaft 12b, the urging support portion 26 has the support shaft due to the restoring force based on the bending as shown by the arrow in the figure (b). The 12b is urged to the engagement receiving portion 24 side.

As shown in FIG. 4A, the mounting opening 25 of the hammer 4 is larger than the diameter of the support shaft 12b, and in addition, is urged when the support shaft 12b is engaged with the engagement receiving portion 24. The support portion 26 functions as a guide. As a result, the hammer 4 can be easily attached to the key 11.

Next, the operation of the hammer 4 when the key is pressed will be described with reference to FIGS. 2 and 5 described above. In FIG. 5, the hammer 4 is centered and the periphery thereof is shown. 2 and 5 (a) show the state of the hammer 4 in the key release state. When the front end portion of the key 11 is pushed down from this state, the key 11 swings forward downward with the top portion 6a of the support rail 6 as a fulcrum, and the support shaft 12b at the rear end portion of the key 11 rises.

In this case, the hammer 4 engaged with the support shaft 12b tries to rise together with the support shaft 12b, but the contact portion 27 at the tip of the hammer 4 is in contact with the bottom surface 14a of the hammer contact rail 14. , Further rise is blocked. As a result, as shown in FIG. 5B, the hammer 4 rotates clockwise around the support shaft 12b, and the contact portion 27 of the hammer 4 is attached to the bottom surface 14a of the hammer contact rail 14. While sliding, it rotates clockwise even with the contact portion 27 as a fulcrum.

Then, when the front end portion of the key 11 is pushed down to the lower limit position, as shown in FIG. 5 (c), the hammer 4 freely rotates around the support shaft 12b, and the hammer body 22 moves downward to the sounding body 5. Collide from. In this case, as shown in FIG. 3C, the contact portion 27 of the hammer 4 separates from the bottom surface 14a of the hammer contact rail 14, and the stopper 28 of the hammer 4 comes into contact with the cushion 16 and slightly crushes it. .. Immediately after that, the stopper 28 of the hammer 4 is pressed by the restoring force of the crushed cushion 16, whereby, as shown in FIG. 5D, the hammer 4 is centered on the support shaft 12b. It rotates slightly counterclockwise. In this case, as shown in FIG. 3D, the hammer body 22 separates from the sounding body 5, while the contact portion 27 of the hammer 4 abuts on the bottom surface 14a of the hammer contact rail 14. By the rotational operation of the hammer 4 as described above, a sound corresponding to the pressed key 11 is generated.

When the key 11 is released, the key 11 swings backward and the support shaft 12b descends. Along with this, the hammer 4 further rotates counterclockwise from the state shown in FIG. 5 (d), and the hammer body 22 abuts on the hammer cushion 9 from above to the original position (shown in FIG. 5 (a)). Return to position).

As described in detail above, according to the present embodiment, in the state where the key 11 and the hammer 4 are connected, the engaging receiving portion 24 of the hammer 4 is the outer peripheral surface of the support shaft 12b with respect to the support shaft 12b of the key 11. The urging support portion 26 of the hammer 4 is urged to the engagement receiving portion 24 side while being in sliding contact with the outer peripheral surface of the support shaft 12b. As a result, when the key is pressed, the hammer 4 rotates while maintaining the state in which the engagement receiving portion 24 and the urging support portion 26 are in sliding contact with the outer peripheral surface of the support shaft 12b of the key 11. While ensuring smooth rotation, it is possible to suppress rattling and bouncing of the rotating hammer 4 as compared with the conventional case, and to prevent vibration and noise from being generated by them.

Further, since the contact portion 27 of the hammer 4 is in contact with the bottom surface 14a of the hammer contact rail 14 from below, the contact portion 27 is rotated around the contact portion 27 as a fulcrum when the key is pressed, and the key 11 is touched. The hammer 4 can be smoothly rotated around the support shaft 12b. Further, the urging of the support shaft 12b by the urging support portion 26 of the hammer 4 is performed by the restoring force based on the bending of the urging support portion 26, so that the urging can be stably maintained for a long period of time. can.

The present invention is not limited to the above-described embodiment, and can be carried out in various embodiments. For example, in the embodiment, the action structure of the present invention is applied to a grand type toy piano, but the present invention is not limited to this, and can of course be applied to an upright type toy piano. ..

Further, in the embodiment, the engaging receiving portion 24 of the hammer 4 is formed by a semicircular curved surface, but the present invention is not limited to this, and the curved surface having a predetermined size with respect to the outer peripheral surface of the support shaft 12b. Various shapes can be adopted as long as they are in contact with each other in a region or at at least two points.

Further, in the embodiment, the key 11 is provided with the support shaft 12b, while the hammer 4 is provided with the support shaft engaging portion 23 having the engaging receiving portion 24 and the urging support portion 26. It is also possible to reverse the positional relationship between the support shaft 12b and the support shaft engaging portion 23.

Further, the detailed configurations of the keyboard 3, the key 11, the hammer 4, and the engaging receiving portion 24 and the urging support portion 26 of the support shaft engaging portion 23 shown in the embodiment are merely examples, and the present invention is provided. It can be changed as appropriate within the scope of the purpose.

1 Toy piano 2 Case 3 Keyboard 4 Hammer 5 Sounding body 6 Support rail 6a Top (fulcrum)
11 Key 12 Hammer connecting part 12b Support shaft 14 Hammer contact rail (immovable part)
14a Bottom surface 14b Rear surface 21 Arm 22 Hammer body 23 Support shaft engaging part 24 Engaging receiving part 25 Mounting opening 26 Biasing support part 27 Contact part

Claims (5)

It is an action structure of a toy piano equipped with a hammer that extends in the front-back direction and rotates with a key pressed, which is configured to swing around the center in the length direction as a fulcrum.
A support shaft provided at the rear end of the key, extending in the left-right direction by a predetermined length and having a circular cross section.
An engaging receiving portion that is provided in a concave shape on the hammer and engages with the outer peripheral surface of the support shaft in a sliding contact state.
Attached to the hammer, the support shaft is urged toward the engagement receiving portion, and the support shaft is slidably contacted with the outer peripheral surface of the support shaft to support the support shaft in cooperation with the engagement receiving portion. With the support department,
Equipped with
When the key is pressed, the hammer swings forward and downward, and the support shaft rises together with the rear end portion of the key, so that the hammer rotates about the support shaft. The action structure of the toy piano that is characteristic. A contact portion provided on the hammer and located in front of the engagement receiving portion, and a contact portion.
An immovable portion that is immovably provided in the toy piano and that the abutting portion abuts from below,
Further prepare
The toy according to claim 1, wherein the hammer is configured to rotate about the contact portion as a fulcrum while rotating about the support shaft when the key is pressed. Piano action structure. Further provided with a mounting opening provided on the hammer, having a dimension larger than the diameter of the cross section of the support shaft and for engaging the support shaft with the engagement receiving portion.
The urging support portion extends from the edge portion of the mounting opening toward the engaging receiving portion, and when the hammer is mounted on the key, the support shaft moves from the mounting opening to the engaging receiving portion. When the support shaft is pressed by the support shaft, it gradually bends greatly, and when the support shaft engages with the engagement receiving portion, the restoring force based on the bending urges the support shaft. The action structure of the toy piano according to claim 1 or 2, wherein the toy piano is configured in. In the toy piano, a sounding body for emitting a predetermined sound according to the key is provided.
The hammer is provided with a hammer main body portion located behind or below the engagement receiving portion.
The action structure of a toy piano according to any one of claims 1 to 3, wherein the hammer rotates when a key is pressed, and the hammer body collides with the sounding body to produce a sound. Any of claims 1 to 4, wherein the engaging receiving portion has an arcuate curved surface, and the radius of curvature of the curved surface is set to be larger than the radius of the cross section of the support shaft. The action structure of the toy piano described in the radius.

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