JP2001166768A - Topboard opening/closing device of grand piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a topboard opening/closing device of a grand piano which is relatively inexpensive, does not impair the appearance of the piano and enables even females on children to easily, surely and slowly close a topboard. SOLUTION: The topboard opening/closing device of the grand piano which opens and closes the topboard 2 having a topboard rear 3 mounted freely turnably around a fulcrum 4 to an outer rim 5 is provided with a topboard prop 8a which is freely turnably connected to a position where its one end faces the fulcrum 4 of the outer rim 5, and a piston type oil damper 12 which is mounted at the rear surface of the topboard rear 3, projects toward the side opposite to the fulcrum 4, is disposed along the rear surface of the topboard rear 3 freely expandably and contractably in a direction orthogonal with the turning axis of the fulcrum 4, has a piston 15 freely turnably connected to the other end of the topboard prop 8a and brakes the topboard 2 by the piston 15 by pressing of the topboard prop 8a when the topboard rear 3 turns to the closing piston side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grand piano opening / closing device for opening and closing a large roof with respect to a side plate of a piano body.

[0002]

2. Description of the Related Art FIG. 4 shows a general roof opening / closing device of a conventional grand piano. This grand piano 5
The large roof 2 is generally made of Lauan plywood or the like, and includes a large roof 3 and a large roof (not shown) that can be folded rearward with respect to the large roof 3. After large roof 3
Has a bass side end rotatably attached to a side plate 5 via a hinge 4, and at a predetermined position on the back surface, two raising rod trays 6, 6 are provided side by side in the left-right direction. Have been.

On the other hand, the side plate 5 constitutes a piano body together with a built-in frame and a sound board (both not shown), and large, medium and small large roofs having different lengths are provided on the inner surface on the treble side. One end of each of the protruding rods 8a, 8b, 8c is rotatably mounted via a support shaft 7. As shown in FIG. 5, the large-roof lifting rod (medium) 8b and the large-roof lifting rod (small) 8c are sequentially accommodated in the large-roof lifting rod (large) 8a in a nested manner.

[0004] With the above arrangement, for example, when the piano is not used or when practicing, as shown in FIG. 4 (b), all the large roof raising rods 8 a to 8 c are folded to protect the internal mechanism of the side plate 5. As a result, the large roof 2 is closed. On the other hand, when playing the piano alone in a concert or the like, the large roof raising rod (large) 8a is raised with the treble part of the large roof 2 raised, and the tip is raised toward the center. 6, the large roof 2 is held at a large open position (position shown in FIG. 3A) inclined at a large angle. In addition, when performing an ensemble with another instrument, for example, the large roof lifting bar (medium) 8b or the large roof lifting bar (small) 8c is moved toward the side plate 5 so that the co-star can be seen. The large roof 2 is held in the middle open position or the small open position inclined at a smaller angle. FIG. 3C shows the small open position.

[0005]

However, in the above-mentioned conventional large roof opening / closing device, since the end of the large roof 2 is simply attached through the hinge 4, the opening and closing of the large roof 2 is difficult. While supporting the large roof 2 with one hand, the large roof lifting rods 8a to 8c must be operated with the other hand. On the other hand, the large roof 2 has a considerably large area, and the total weight of a full concert piano reaches 40 to 50 kg. For this reason, the large roof 2 cannot be easily opened and closed with the power of a woman or a child, and cannot be supported during the opening and closing operation.
The large roof 2 closes vigorously under its own weight, which may cause problems such as damage to the large roof 2 and the side plates 5.
In particular, when the large roof 2 is closed from the large open position, it is necessary to hold the large roof 2 with one hand and fold the large roof push-up rod (large) 8a while slowly closing it. Since the roof 2 is located far away from the treble side and is operated in an unreasonable posture, the above-described inconvenience is likely to occur.

For this reason, a large roof opening / closing device for solving such a problem has been conventionally proposed.
For example, it is disclosed in JP-A-9-230851. As shown in FIG. 6, the large roof opening / closing device A includes a motor 52 rotatably attached to a side plate 51, a feed nut 53 screwed into a male screw 52b formed on an output shaft 52a of the motor 52, Two arms 55, 55 having one end rotatably connected to the feed nut 53 and the other end connected to the side plate 51 and the large roof (after the roof) 54, respectively.
And so on. According to the device A, when the motor 52 is operated, the feed nut 53 screwed into the male screw 52b is provided.
Advance and retreat, and the arms 55 and 55 rotate,
The large roof 54 is opened and held at an arbitrary angle. But,
This large roof opening / closing device A has a complicated structure and requires a power supply for driving the motor 52, so that the cost is high and, as shown in FIG. The output shaft 52a, the arm 55, and the like are conspicuously visible, and significantly impair the appearance of the piano.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and is relatively inexpensive and does not impair the appearance of the piano. An object of the present invention is to provide a grand piano large roof opening / closing device that can be closed slowly, thereby reliably preventing damage to the large roof and side plates.

[0008]

In order to achieve this object, the present invention provides a large roof having a large roof rear rotatably mounted on a side plate around a fulcrum, with a closed position for closing the side plate and an open position. A large-roof opening and closing device for a grand piano for opening and closing between an open position and a large-roof protruding bar rotatably connected at one end to a position facing a fulcrum of a side plate; At the other end of the large roof protruding rod, it is attached to the back of It has a piston that is rotatably connected, and when the back of the large roof turns to the closed position side,
A piston-type oil damper that brakes the large roof by being compressed by a large-roof push-up bar, whereby the piston contracts.

According to the large roof opening / closing device of the grand piano, when the rear of the large roof turns to the closed position, the piston of the piston type oil damper is pressed by the large roof push-up bar and contracts. Brake and slow down the large roof.
In this case, the piston is provided so as to be extendable and contractible in a direction perpendicular to the rotation axis of the fulcrum after the large roof, so that the braking force of the piston type oil damper is effective after the large roof through the large roof lifting rod. , The braking of the large roof can be effectively performed. Therefore, even for women and children,
The large roof can be closed slowly and easily with a small operation force. As a result, it is possible to completely avoid a situation in which the large roof closes vigorously, and it is possible to reliably prevent a trouble such as damage to the large roof and the side plate.

[0010] The piston type oil damper is arranged in a discreet manner so that the piston is along the back surface of the large roof, and the large roof raising rod is usually provided on a grand piano. As such, the appearance of the piano is hardly impaired. Furthermore, this large roof opening / closing device can be configured simply by adding a piston-type oil damper to a normal piano, and the piston-type oil damper is relatively simple in configuration and inexpensive as a damper. It can be configured easily and inexpensively.

[0011] In this case, it is preferable to further comprise a locking means for locking the rotation of the piston and the large-roof lifting rod when the rear of the large roof is at the open position.

In this configuration, the large roof in the open position is prevented from rotating toward the closed position by the lock means, so that the large roof can be stably held in the open position.

In these cases, there is further provided a rotary oil damper which is provided at a connection portion between the piston and the large-roof lifting rod, and which brakes the rear of the large roof when the rear of the large roof turns to the closed position. Is preferred.

In this configuration, when the large roof is closed, the large weight is supported by the piston type oil damper and the rotary oil damper in cooperation, so that the large roof can be more reliably braked and decelerated. .

Further, in these cases, it is preferable to further include a damper cover attached to the back surface after the large roof and covering the piston type oil damper.

In this configuration, the piston-type oil damper is covered and hidden by the damper cover, so that it becomes less noticeable, so that a better piano appearance can be obtained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a large roof opening / closing device 1 of a grand piano 1 according to a first embodiment of the present invention.
1 is shown. In the following description, among the constituent elements of the grand piano 1, the same reference numerals will be used for those common to the conventional grand piano 50 shown in FIG.

As shown in the figure, the large roof 2 comprises a large roof rear 3 and a large roof front (not shown) that can be folded rearward with respect to the large roof rear 3 as in the prior art. ing. In addition, the rear side of the large roof 3 has a hinge 4 at the lower end.
And is rotatably attached to a predetermined position of the side plate 5 via one end.
Is provided. Also, at predetermined positions on the treble side of the side plate 5 facing the hinges 4, large roof push-up bars (large) (medium) (small) 8a, 8b, 8c (see FIG. 5) having the same configuration as the conventional one.
Are rotatably mounted via a support shaft 7. Large roof raising bar (medium) 8b and large roof raising bar (small) 8c
Can be engaged with the lifting rod tray 6.

The large-roof opening / closing device 11 according to the present invention includes an oil damper 12 (piston-type oil damper) attached to the back surface of the large roof rear 3 and the large-roof lifting rod (large) 8a.
And a damper cover 13 that covers the oil damper 12. As shown in FIG.
Is a commercially available piston type, and includes a cylindrical casing 14 filled with oil, a piston 15 slidable with respect to the casing 14, and the like. The oil damper 12 is configured such that when the piston 15 slides toward the casing 14, that is, when the piston 15 contracts, oil pressure resistance is generated by oil.

The oil damper 12 is provided on the casing 1.
4, the band 15 is attached to the rear surface of the large roof 3 in a predetermined direction by three band fittings 16 and screws 17 that sandwich the same, so that the piston 15 is moved from the casing 14 to the side opposite to the hinge 4. , And extends and contracts along the rear surface of the large roof rear 3 in a direction orthogonal to the rotation axis of the hinge 4. At the tip of the piston 15,
A roller 18 is rotatably mounted, and the tip of a large roof lifting rod (large) 8a is rotatably connected to the roller 18. The roller 18 is in contact with the back surface of the large roof 3, and rolls on the rear surface of the large roof 3 as the piston 15 expands and contracts. A cover (not shown) made of felt, artificial skin, or the like is attached to the peripheral surface of the roller 18 to prevent the rear roof 3 from being damaged or noise.

Further, as shown in FIG.
A long groove 19 is formed at the tip end of the long groove 19.
A slider 20 (lock means) is housed so as to be able to protrude and retract. On the other hand, a locking groove 21 (lock means) with which the slider 20 can be engaged is formed at the tip of the large roof raising rod (large) 8a. The slider 15 is slid in a state where it is at a predetermined angle to the engagement groove 21 so that the piston 15 and the large roof lifting rod (large) 8a are locked at that angle. Has become.

The damper cover 13 is composed of a molded product of a synthetic resin or a bent product of an iron plate.
As shown in FIG. 3, the casing 14 of the oil damper 12 is screwed to the rear surface of the rear large roof 3 with a long screw 22 or the like, for example. This damper cover 13
In order to maintain the appearance of the piano, it is preferable to make the color the same as that of the rear roof 3 such as black if it is a black-painted piano, for example.

Next, the operation of the large roof opening / closing device 11 having the above configuration will be described. FIG. 1A shows a state where the large roof 2 is in a large open position (open position). In this state,
As the piston 15 is extended to the maximum, the large roof lifting rod (large) 8a connected thereto is inclined at a large angle so as to be substantially perpendicular to the piston 15, and the large roof Numeral 2 largely opens the side plate 5. FIG.
As shown in (b), since the slider 20 is engaged over the long groove 19 of the piston 15 and the locking groove 21 of the large roof lifting rod (large) 8a, the large roof 2 is largely opened. Locked in position.

From this large open position, the slider 20 is moved from FIG.
After the lock is released by sliding the piston 15 to the long groove 19 side as shown in FIG. 7A, the large roof 2 is rotated toward the closed position when the large roof 2 is turned over. Along with this rotation, the large roof lifting rod (large) 8a is gradually folded, and the piston 15 is pressed by the weight of the large roof 2 via the large roof lifting rod (large) 8a. Gradually shrink. At this time, since the roller 18 rolls on the rear side 3 of the large roof, the piston 15 contracts smoothly. In addition, the hydraulic resistance of the oil damper 12 acts on the rear portion 3 of the large roof via the piston 15 and the large roof push-up rod (large) 8a, so that the large roof 2 is braked and decelerated by the oil damper 12. , Slowly rotate to the closed position shown in FIG. The large roof 2 is set to the middle open position and the small open position by rotating the rear 3 of the large roof to a predetermined angle on the way, and pushing up the large roof bar (medium).
The engagement can be performed in the same manner as in the related art by engaging the lifting rod 8b or the large roof raising rod (small) 8c with the lifting rod tray 6. FIG. 1C shows a state where the camera is set at the small open position.

As described above, in the large roof opening / closing device 11 of the present embodiment, when the large roof 2 is closed, the large roof 2 is braked by the oil damper 12 and decelerated.
The large roof 2 at the large open position can be closed slowly and easily with a small operation force. As a result, a situation in which the large roof 2 closes vigorously can be completely avoided, so that problems such as damage to the large roof 2 and the side plates 5 can be reliably prevented. Also, the piston 15
The oil resistance of the oil damper 12 is reduced to the rear of the large roof 3 via the large roof push-up rod (large) 8 a by being provided so as to be extendable and contractible in a direction orthogonal to the rotation axis of the hinge 4 of the large roof 3. Since it works effectively, braking of the large roof 2 can be performed effectively.

Further, when the rear of the large roof 3 is located at the large open position, the piston 20 and the large roof lifting rod (large) 8a are locked by the slider 20 so as not to rotate with respect to each other. It can be stably held at the large open position.

Further, the oil damper 12 is provided with the piston 1
5 is arranged along the back surface of the rear of the large roof 3 and is covered with the damper cover 13 so that it is inconspicuous from the outside, and the large roof raising bar (large) 8a is usually provided on a grand piano. Therefore, the appearance of the piano hardly changes and this can be maintained well. In this case, as shown in FIG. 2B, by making the damper cover 13 longer, not only the casing 14 of the oil damper 12 but also the piston 15 may be covered. Since the damper cover 13 having such a configuration is similar in appearance to a conventional large roof reinforcing tree provided for reinforcing the rear of the large roof 3 in a large grand piano or the like, a better appearance is obtained. Can be.

The large-roof opening / closing device 11 can be constructed simply by adding an oil damper 12 to a normal grand piano, and since the oil damper 12 is a simple and inexpensive piston type, it is easy to use. It can be configured at low cost.

The present invention can be implemented in various modes without being limited to the above-described embodiments.
For example, in addition to the piston-type oil damper 12 of the embodiment, the connecting portion between the piston 15 and the large-roof push-up rod (large) 8a brakes the pivot 3 toward the closed position after the large roof 3. A rotary oil damper (not shown) may be further provided. With such a configuration, although the cost increases, the large weight of the large roof 2 is supported by the two dampers in cooperation, so that the braking and deceleration of the large roof 2 can be performed more reliably.

The piston 1 is provided in the oil damper 12.
A spring may be incorporated so that the spring force gradually increases as the stroke of No. 5 increases. With such a configuration, the spring force of the spring is maximized at the end of closing of the large roof 2 where the rotation speed tends to increase, so that the large roof 2 can be closed more surely and slowly. By acting as a force to assist this when the large roof 2 is opened, the large roof 2 can be easily opened with a smaller operation force.

Furthermore, although the embodiment is an example in which the present invention is applied to a grand piano, it is needless to say that the present invention may be applied to a grand piano type electronic piano having a large roof. In addition, the damper cover and the lock unit described in the embodiment are merely examples, and other appropriate configurations can be adopted. In addition, details can be appropriately changed within the scope of the present invention.

[0032]

As described in detail above, the roof opening / closing device for a grand piano according to the present invention is relatively inexpensive and does not impair the appearance of the piano. This has the effect that the door can be closed slowly and surely, so that damage to the large roof and side plates can be reliably prevented.

[Brief description of the drawings]

FIG. 1 shows a large roof opening and closing device according to an embodiment of the present invention.
It is a front view showing in the state where a large roof is in a (a) large open position, (b) closed position, and (c) small open position.

FIG. 2 is a perspective view of an oil damper and a damper cover.

FIG. 3 is a partially enlarged front view showing a lock means for locking a piston and a large roof push-up bar (large) of the oil damper of FIG. 1;

FIG. 4 is a front view similar to FIG. 1 of a conventional general roof opening / closing device.

FIG. 5 is a plan view showing a large roof lifting bar.

FIG. 6 is a front view showing an example of a conventional large roof opening / closing device in a state where the large roof is at a large open position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grand piano 2 Large roof 3 After large roof 4 Hinge (fulcrum) 5 Side plate 8a Large roof lift bar (Large) (Large roof lift bar) 11 Large roof opening / closing device 12 Oil damper (piston type oil damper) 13 Damper cover 15 Piston 20 Slider (locking means) 21 Locking groove (locking means)

Claims (4)

[Claims] 1. A grand piano for opening and closing a large roof having a rear of a large roof rotatably mounted on a side plate around a fulcrum between a closed position for closing the side plate and an open position for opening the side plate. A large-roof opening / closing device, one end of which is rotatably connected to a position facing the fulcrum of the side plate; a large-roof lifting bar attached to a back surface after the large-roof; Projecting toward the side, extending and contracting along the back surface after the large roof and in a direction perpendicular to the rotation axis of the fulcrum, and rotatably connected to the other end of the large roof lifting rod. The piston type oil which has a piston, and when the rear of the large roof rotates to the closed position side, the piston is contracted by being pressed by the large roof push-up rod, thereby contracting the piston to brake the large roof. Equipped with a damper and A large roof opening and closing device for a grand piano. 2. The apparatus according to claim 1, further comprising a lock unit configured to lock the rotation of the piston and the large-roof lifting rod when the rear of the large roof is located at the open position. Item 2. A grand roof opening / closing device according to Item 1. 3. A rotary oil damper, which is provided at a connecting portion between the piston and the large-roof lifting rod and brakes the rear of the large roof when the rear of the large roof rotates toward the closed position. The large-roof opening / closing device for a grand piano according to claim 1 or 2, further comprising: 4. The grand piano according to claim 1, further comprising a damper cover attached to a back surface behind the large roof and covering the piston type oil damper. Roof opening and closing device.