JPS5829515Y2 - Doornotsuka - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement of a door knocker.

Door no Tsuka are often used as luxurious decorations around the doors of ordinary houses.

It consists of a decorated door lock body and an annular tapping part provided on the door lock body.By holding the tapping part and hitting the door, you can use the banging sound to notify visitors. .

However, since the door to which such a door knocker is attached is made of a heavy and hard material, the sound produced by the door knocker is relatively small even when the striking portion is strongly struck.

Therefore, if people in the house are close to the door, they can clearly hear the banging sound, but if they are in a room far away from the door, they can hardly hear it, causing discomfort to visitors.

The present invention was developed with attention to the above-mentioned circumstances, and its purpose is to provide a door knocker that can reliably notify the occupants of a residence even if a visitor hits it with a light force. It is something to do.

An embodiment of the present invention will be described below based on the drawings.

1 in the figure indicates, for example, the entrance of a general house, and this entrance 1
A downlight 2, an entrance light 3, a door 4, and the like are provided.

A decorative handle 5, a peephole 6, a door knocker 7, which will be described later, and the like are attached to the door 4.

That is, 8 is the main body of the door door, which is decorated in the shape of a lion's face, for example.

A striking part 9 decorated in a substantially annular shape is rotatably suspended from the lion's mouth of the door knocker main body 8.

As shown in FIG. 2, a piezoelectric element 10 is provided on the surface of the door 4 at a position where a portion of the above-mentioned striking portion 9 comes into contact.

This piezoelectric element 10 is preferably one that is linked to the keyboard of a desktop electronic computer, for example, so that the activation force is generated only when it receives an impact force, and the force is about the same as the rotation of the striking part 9 when the door 4 is opened and closed. No electromotive force is generated when the voltage is applied.

Furthermore, the piezoelectric element 10 is electrically connected to an amplifier 11 having a switch circuit, which is installed in a place out of the public eye, such as the ceiling inside the entrance 1, for example.

A power cord 12 for communication with a power source and a chime 13 serving as an alarm are electrically connected to the amplifier 11.

The chime 13 is preferably installed in a room in the house that is far away from the door 4.

If the visitor lightly grasps the tapping part 9 and rotates it to hit the door 4, a shock is simultaneously applied to the piezoelectric element 10 and a hitting sound is generated.

In response to this impact force, the piezoelectric element 10 generates an electromotive force and sends a signal to the amplifier 11.

The amplifier 11 amplifies the signal, sends a switch signal to the chime 13, and makes it ring.

Therefore, the visitor can hit the door 4 and the piezoelectric element 1 with the tapping part 9.
The sound of hitting 0 and the notification sound of the chime 4 are generated at the same time, and people in the house can know the presence of guests even if they are near the door 4 or far away from the door 4.

In addition, as the piezoelectric element 10 in the above embodiment, specifically, it is preferable to use one as described below.

That is, this uses a piezoelectric material with a bimorph structure.

The piezoelectric body is formed from a rubber composite piezoelectric body.

This rubber composite piezoelectric material is made of a compound of rubber containing a vulcanizing agent and ferroelectromagnetic powder.
00 parts by weight of lead zirconate titanate 200-10
The mixture was uniformly mixed at a ratio of 0.00 parts by weight and rolled to a thickness of 0.1 to 2 mm.

The piezoelectric body with the bimorph structure is shown in Fig. 3, and the two sheets a and a of the above-mentioned rubber composite piezoelectric sheets are made of conductive rubber (for example, the same rubber material used for the piezoelectric sheets mixed with carbon). Inner electrode sheet consisting of a) b)
These piezoelectric sheets a', a, inner and outer electrode sheets b, c are stacked together with the piezoelectric sheets a', a, inner and outer electrode sheets b, c.

C is vulcanized and bonded together by heating and pressurizing, and then the inner electrode sheet b) and the circumferential outer electrode sheet c are formed.

It is formed by applying a DC voltage between C and polarizing it.

By providing the piezoelectric element 10 with a receiver (not shown), which is struck by the striking portion 9, on a part of the back side of the metal fitting, an electromotive force is generated in the receiver under the influence of the impact force applied to the metal fitting.

A metal fitting is not necessarily required for the receiver, and the striking portion 9 may directly strike the piezoelectric element 10.

Note that by making the width of the inner electrode sheet b narrower than that of the piezoelectric sheets a, a and the outer electrode sheets c, c, even if the door 4 gets wet due to rain, the inner electrode sheet b will remain the same as the outer electrode sheet c.

There is no need to short circuit with C, and the insulation effect is good.

As explained above, according to the present invention, a doorknot force body having a striking part is attached to the door, and a piezoelectric element is provided that generates a striking sound and an electromotive force when the striking part is struck, and this piezoelectric element Since the system generates a notification sound that receives the signal from the door, not only people near the door but also people far away from the door can recognize the visitor, and the visitor is not made to feel uncomfortable. This has a practical effect.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a front view of an entrance equipped with a door knocker, FIG. 2 is a component country of the door knocker, and FIG. 3 is a vertical sectional view of a piezoelectric element. 4...Door, 8...Door no Tsuka, 9.
....beating part, 10... piezoelectric element, 13.
...Alarm (chime).

Claims (1)

[Scope of utility model registration request] A door knocker body that is attached to the door and has a tapping part; a piezoelectric element that generates a tapping sound and an electromotive force when the tapping part is tapped; and a piezoelectric element that is electrically connected to the piezoelectric element and generates a notification sound in response to a signal. A door notification device comprising: an alarm that generates an alarm;