JPH08173452A - Dental handpiece - Google Patents

Abstract

PURPOSE: To provide a dental handpiece having a function to prevent the deterioration of the peripheral parts of a driving motor by an autoclave. CONSTITUTION: The motor 1 is hermetically sealed by a sealing cover 2 to prevent the inflow of an evaporated medicinal liquid into the motor 2 when the autoclave is used. The transmission of the driving power from the motor 1 to a spindle 10 of a handpiece body 11 is executed by a magnetic coupling in order to enhance the hermeticity of the sealing cover 2.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a dental handpiece.

[0002]

2. Description of the Related Art Dental handpieces require sanitization from the point of view of hygiene. As a disinfection method, an autoclave for sending steam into the handpiece to boil and disinfect the entire handpiece, or a chemical clave for vaporizing a chemical solution and performing the same disinfection is the mainstream.

[0003]

However, when sterilized by an autoclave or the like, the vaporized chemical solution flows into the inside of the motor which is the drive source, and the bearing and its peripheral parts such as lubricating oil are rusted. However, there is a problem in that the rotation efficiency is reduced. The inflow path is, for example, the air supply port 14 and the exhaust port 15 in FIG. In particular, when a brush motor is selected as the drive source, there is a problem that the brush is significantly deteriorated due to the permeation of the chemical liquid, or the permeation increases the resistance of the brush against the rotating shaft, thereby lowering the rotational efficiency. Incidentally, the brush motor is a motor of a type in which a contact called a brush is provided on the stator side, and electricity is supplied to the electromagnet of the rotor through the brush to obtain a rotational force.

Therefore, the brush motor is not suitable as a drive source for a medical handpiece, and is mainly used as a drive source for a hand tool used for processing dental casts that do not require disinfection. Is. Then, for the above reason, the drive source of the therapeutic handpiece is generally a brushless motor without a brush, or an air turbine that obtains a rotational force by blowing compressed air to the turbine, but both are generally used. There is a problem that it is very expensive as compared with the brush motor.

The present invention focuses on the above problems, and an object thereof is to provide a dental handpiece having a function of preventing deterioration such as rust of motor peripheral parts due to an autoclave or a chemical clave. is there.

[0006]

DISCLOSURE OF THE INVENTION The gist of the present invention is a dental handpiece using a motor as a drive source, wherein a magnetic field is formed by a first magnet on the spindle of the motor and a second magnet on the spindle of the handpiece body. And a driving force is transmitted from the main shaft to the spindle by a magnetic coupling, and a seal cover for sealing the inside of the motor from the outside air is provided on the outer circumference of the motor and the first magnet. It is on the dental handpiece provided. The first
The magnet and the second magnet can both be provided on the same rotation axis, but it is preferable to provide the second magnet on the outer circumference of the rotation axis of the first magnet.

[0007]

According to the present invention, by completely sealing the motor, which is the drive source of the handpiece, with the seal cover,
It prevents outside air from flowing into the motor.

In order to improve the airtightness of the above-mentioned seal,
Transmission of driving force from the motor to the handpiece body is
The first magnet provided on the main shaft of the motor and the second magnet provided on the spindle of the handpiece body do not perform mechanical transmission, and attract each other by the magnetic force of each other while interposing the seal cover therebetween. This is done by magnetic coupling. That is, since the first magnet and the second magnet are constantly attracted to each other, when the motor biases the rotation of the first magnet, the second magnet rotates in synchronization with the rotation. Further, in the magnetic coupling, if the second magnet is provided on the outer circumference of the rotation shaft of the first magnet, the magnetic force does not work in the axial direction, so that the driving force can be transmitted without applying a thrust load to the shaft. ..

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partial sectional view of a dental handpiece according to the present invention. Regarding the handpiece main body 11, only a part on the drive source side is shown, and the other parts are omitted. The motor 1 is a drive source of the handpiece and is operated by electricity supplied from the cable 13. The handpiece main body 11 is adapted to transmit a rotational force from the motor 1 as a drive source to a dental treatment tool at a tip end (not shown) by a spindle 10 arranged therein to perform dental treatment. The motor cooling fan 5 draws air into the handpiece from the air supply port 14 provided in the housing 8 as the spindle 10 rotates. The sucked air is discharged from the exhaust port 15 after cooling the motor 1.

When the autoclave or the chemical clave is carried out, the vaporized chemical liquid flows into the handpiece from the air supply port 14 and the exhaust port 15, and if the motor is not protected at this point, it will also enter the motor. The chemical solution flows in and adversely affects peripheral parts such as rust.

Therefore, in order to prevent the chemical solution from flowing into the motor 1, a seal cover 2 shown by hatching in FIG. 1 is provided, and the motor 1 is hermetically sealed over the entire circumference. The seal cover 2 is preferably made of a material having a high heat dissipation property because of the necessity of cooling the motor 1.

In order to improve the airtightness of the seal by the seal cover 2, the motor 1 to the handpiece body 11
The driving force is not transmitted to the main shaft 4, that is, the spindle 10 and the spindle 10 are not mechanically connected, but is transmitted using the following means. That is, the first magnet 7 is fixed to the main shaft 4 by the magnet receiver 6 near the tip of the main shaft 4 of the motor 1, and the second magnet 9 is connected to the spindle 10 so as to surround the first magnet. It is fixed to the cooling fan 5 and a magnetic coupling is formed by utilizing the magnetic forces of these two magnets to transmit the driving force. Regarding the way of arranging the polarities of the magnets, it is possible to use any arrangement as long as they are strongly attracted to each other, such that the poles facing each other are N and S, and N and S are alternately continuous in a ring shape.

Further, as shown in the drawing, the second magnet 9 is connected to the first magnet.
If the magnet 7 is arranged on the outer circumference of the rotating shaft, magnetic force does not act in the axial direction, so that there is an advantage that no thrust load is applied to the shaft. Further, in the present embodiment, the cable connector 12 made of an elastic material is hermetically sealed with the seal cover 2 at a portion where the cable 13 connected to the motor 1 is passed through the seal cover 2, that is, a portion where the seal cover 2 is not present in FIG. By providing this, the sealing of this part with the outside air is strengthened.

The operation of the handpiece of this embodiment will be described below. At the time of dental treatment, the motor 1 is energized by the cable 13 to rotate. That is, the first magnet 7 fixed to the main shaft of the motor 1 rotates. At this time, the second magnet 9 attracting the first magnet 7 by the magnetic force is attracted by the magnetic force, and
The magnet 7 rotates in synchronism with the rotation of the magnet 7. Second magnet 9
Is fixed to the spindle 10 of the handpiece body 11 as described above, the spindle 10 also rotates in synchronization with the rotation of the motor 1. That is, the motor 1
The coupling between the spindle and the spindle 10 is established. Although not shown, a dental treatment tool is provided at the tip of the spindle 10 so that the therapist can treat teeth. At the same time, the motor 1 is cooled by the motor cooling fan 5 to prevent the wiring from being burned.

After the treatment, autoclave or chemical clave is performed to disinfect the handpiece. At this time, of course, the motor 1 is not energized. Steam for autoclave, etc.
And the inside of the handpiece from the exhaust port 15 etc.,
Disinfect each part. However, since the motor 1 is shielded from the outside air by the seal cover 2, steam does not enter the inside of the motor 1. Therefore, the parts inside the motor 1 do not come into contact with steam, that is, deterioration can be prevented.

[0017]

As described above, according to the present invention, the motor, which is the drive source of the handpiece, is completely sealed by the seal cover to prevent outside air from flowing into the motor. It is possible to avoid deterioration of motor peripheral parts due to autoclave or chemical clave. Therefore, the brush motor, which has been unsuitable as a drive source for the therapeutic handpiece because it has a brush that has been inexpensive and is susceptible to deterioration by an autoclave or a chemical clave, has been used as a treatment handpiece. It can be used as a drive source.

In the present invention, the transmission of the driving force from the motor, which is the drive source, to the handpiece main body is performed by the magnetic coupling due to the magnets provided on the main shaft of the motor and one end of the spindle of the handpiece main body. Therefore, the sealing of the motor by the seal cover is very airtight. In the magnetic coupling,
Since the second magnet provided at one end of the spindle of the handpiece body is provided on the outer circumference of the rotating shaft of the first magnet of the main shaft of the motor, the magnetic force does not work in the axial direction. There is an effect such that the driving force can be transmitted without any trouble.

[Brief description of drawings]

1 is a partial cross-sectional view of a dental handpiece of the present invention.

[Explanation of symbols]

 1. Motor 2. Seal cover 3. Ball bearing 4. Motor spindle 5. Motor cooling fan 6. Magnet holder 7. First magnet 8. Housing 9. Second magnet 10. Spindle 11. Handpiece body 12. Cable connector 13. Cable 14. Air supply port 15. exhaust port

Claims (2)

[Claims] 1. A dental handpiece using a motor as a drive source, wherein a magnetic coupling is provided by a first magnet provided on a main shaft of the motor and a second magnet provided on a spindle of a handpiece body. A dental handpiece, which transmits a driving force from a main shaft to the spindle, and has a seal cover for sealing the motor from the outside air on the outer periphery of the motor and the first magnet. 2. The second magnet is provided on the outer circumference of the rotation shaft of the first magnet.
The dental handpiece according to claim 1, wherein the magnet is provided.