JP3419972B2 - Grand piano seismic device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earthquake-proof device for a grand piano for preventing damage or excessive movement of the grand piano during an earthquake, and especially for preventing breakage of legs.

[0002]

2. Description of the Related Art Since the Great Hanshin Earthquake, attention has been paid to the importance of safety measures against earthquakes, and prevention of collapse and movement of furniture in the room is one of them. Such earthquake countermeasures have been conventionally performed even for acoustic pianos with a large weight, and in the case of grand pianos,
Since there is little risk of falling like an upright piano, emphasis is placed on preventing slippage. For this reason, conventional seismic resistance devices for grand pianos are those in which the lower end of each leg made of wood is fixed to the floor with fixing metal fittings, or the lower end of each leg is fixed to the metal fitting fixed to the floor. The mainstream is something to combine.

[0003]

However, in this conventional seismic resistant device, the lower ends of the legs are fixed to the floor and their displacements are restrained. Therefore, when a lateral load acts on the grand piano due to an earthquake, There is a problem that the stress is increased and the leg weak in strength is easily broken due to shear failure. In fact
Most of the causes of breakage of grand pianos due to earthquakes are due to breakage of legs, and it is an important issue for earthquake countermeasures to solve this.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a seismic resistant device for a grand piano capable of reliably preventing damage to the legs during an earthquake. .

[0005]

In order to achieve the above object, the present invention is an earthquake-proof device for a grand piano, which comprises a piano body and a plurality of legs extending downward from the piano body. , A base whose upper end is fixed to the lower surface of the piano body, and a base plate which is provided at the lower end of the pillar and is slidably mounted on the floor surface. It is characterized by being configured by a sled member that supports the piano body in a floating state.

In this seismic resistant device for a grand piano, the pillar of the sled member is fixed to the lower surface of the piano body at the center of gravity of the grand piano, and the base plate of the sled member is slidably mounted on the floor. As a result, the piano body is supported on the floor only by the sled-shaped members in a state where each leg is floated from the floor surface. When an earthquake occurs, the lateral load acting on the grand piano due to the energy,
It acts on the sled member via the piano body. When this lateral load exceeds the maximum frictional force between the base plate of the sled member and the floor surface, the sled member slides on the floor surface, and the grand piano supported by the sled member also moves horizontally along with the sled member. Move in the direction. Thus, in the earthquake-resistant device of the present invention, the piano body is supported by the sled member in a state where the legs are floated from the floor surface, and when a lateral load due to an earthquake acts, the entire grand piano together with the sled member. Since the lateral load is absorbed by the horizontal movement, a large shear stress is not generated in the leg, and therefore the leg can be reliably prevented from being broken.

In this case, it is preferable that the base plate is a disk. According to this configuration, the base plate can be slid in that direction regardless of the direction of action of the lateral load due to the earthquake, so that the horizontal movement of the grand piano can be smoothly performed.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows an installation situation of a seismic resistant device to which the present invention is applied. As shown in the figure, the seismic resistant device 1 is composed of a sled member 3 installed between a grand piano 2 and a floor F.

The grand piano 2 includes a piano body 4 and three legs 5, 5 and 5 extending downward from a predetermined position on the lower surface of the piano body 4 and supporting the same, and the legs 5 are made of wood material. ing. At each lower end of the leg 5, a caster 6 movable in an arbitrary direction is provided as usual.

On the other hand, the sled member 3 is made of a metal plate such as an iron plate or a wood plate, and is composed of a column 7 and a circular base plate 8 whose center is fixed to the lower end of the column 7.
As shown in FIG. 4, R is attached to the outer periphery of the lower surface of the base plate 8. Also, the vertical length of the sled member 3 is
It is set to be slightly larger than the sum of the lengths of the legs 5 and the casters 6.

As shown in FIG. 4, in the sled-shaped member 3 having the above-described structure, the upper end of the column 7 is located on the lower surface of the piano body 4 at a position corresponding to the center of gravity G of the grand piano 2 (see FIG. 2).
It is attached via a mounting plate 9 and screws 10. In this state, a gap C of, for example, 3 to 5 mm is generated between the caster 6 of each leg 5 and the floor F, and the piano body 2 is supported only by the sled member 3 with the legs 5 floating ( (See FIGS. 3 and 4). Because of the length relationship between the sled member 3 and the leg 5, the sled member 3 can be attached, for example, between the caster 6 of each leg 5 and the floor F by a spacer plate (not shown) having an appropriate thickness. This is done by raising the piano body 4 with a gap), attaching the sled member 3, and then removing the spacer plate.

When an earthquake occurs with the sled member 3 thus attached, a lateral load acting on the grand piano 2 due to the energy acts on the sled member 3.
When the lateral load exceeds the maximum frictional force between the base plate 8 and the floor F, the sled member 3 slides on the floor F, and the grand piano 2 supported by the sled member 3 also slid with the sled member 3. Move horizontally together. Since the lateral load is absorbed by the horizontal movement of the grand piano 2, even if a large earthquake occurs, a large shearing stress does not occur in the leg 5, and therefore the leg 5 can be reliably prevented from being broken. it can.

In this case, it is preferable that the sled member 3 is surely slid in the horizontal direction, while preventing the slid member 3 from sliding too much to suppress the movement amount of the grand piano 2 as much as possible. It is important to make the friction coefficient between F to be an appropriate size. Therefore, in practice,
The material, the diameter D, the thickness H, etc. of the base plate 8 are determined according to the type of the floor F (wooden floor, carpet, tatami, etc.) and the situation.

Further, since the base plate 8 is composed of a circular plate and R is attached to the outer periphery of the lower surface thereof, the base plate 8 can be slid in that direction regardless of the direction of the lateral load applied by the earthquake. Thus, the horizontal movement of the grand piano 2 can be smoothly performed. Furthermore, in the earthquake-resistant device 1 of the present embodiment, it is not necessary to process the grand piano 2 at all, only the sled member 3 is prepared, and the piano body 4
Since it only needs to be attached to, it can be constructed at low cost.

The present invention is not limited to the embodiment described above and can be implemented in various modes.
For example, the pillar of the sled member may be composed of a plurality of pillars, and the pillars may be arranged so that their center of gravity coincides with the center of gravity of the grand piano and be attached to the piano body. In addition, the detailed configuration can be changed as appropriate without departing from the spirit of the present invention.

[0016]

As described in detail above, in the seismic resistant device of the present invention, the piano body is supported by the sled member while the legs are floated from the floor surface, and when the lateral load due to the earthquake is applied, Since the entire piano moves horizontally along with the sled member to absorb the lateral load, even if a large earthquake occurs, large shear stress does not occur in the legs, so it is possible to prevent the legs from breaking. It has the effect of being able to.

[Brief description of drawings]

FIG. 1 is a perspective view showing an installation situation of an earthquake-proof device for a grand piano to which the present invention is applied.

FIG. 2 is a plan view of the seismic resistant device of FIG.

3 is a front view of the seismic resistant device of FIG. 1. FIG.

FIG. 4 is an enlarged front view of a portion indicated by an arrow IV in FIG.

[Explanation of symbols]

1 Earthquake-proof device 2 grand piano 3 sled members 4 piano body 5 legs 7 props 8 base plate F floor Center of gravity of the G grand piano

Continuation of the front page (56) References Actual opening Sho 56-60984 (JP, U) Actual opening Sho 56-147492 (JP, U) Actual opening Sho 56-120588 (JP, U) Actual opening Sho 53-80430 (JP , U) Actual development 55-125683 (JP, U) Actual development 56-141802 (JP, U) Actual development 59-36284 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) G10C 3/00 G10C 1/04

Claims (2)

(57) [Claims] 1. A seismic resistant device for a grand piano, comprising a piano body and a plurality of legs extending downward from the piano body, the seismic resistance device being located at the center of gravity of the grand piano and having an upper end on the lower surface of the piano body. A sled that includes a fixed strut and a base plate that is provided at the lower end of the strut and that is slidably mounted on the floor surface, and that supports the piano body with the plurality of legs floating from the floor surface. Earthquake-resistant device for a grand piano, which is characterized by being configured by a strip-shaped member. 2. The seismic resistance device for a grand piano according to claim 1, wherein the base plate is a disc.