JPH0761342B2 - Device for preventing internal contamination of dental handpieces - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental hand in which dust or the like generated when cutting a tooth or a tooth is prevented from entering the handpiece when the operating state of the dental handpiece is changed from the operating state to the stopped state. A device for preventing internal contamination of a piece.

[0002]

2. Description of the Related Art Conventionally, various internal pollution preventing devices of this kind have been developed. For example, there is one that supplies low-pressure air into the handpiece for a certain period of time after a stop state by an electric instruction, or one that continues to supply low-pressure air into the handpiece after a stop state.

[0003]

By the way, in the former one, in which the low-pressure air is electrically supplied for a certain period of time after being stopped, an electric circuit is required in addition to the air circuit. Since a solenoid valve and the like are also required, there is a problem that the structure is complicated and the cost is high.

Further, in the latter case of continuously supplying low-pressure air from the stopped state, air is leaking from the handpiece even though the pressure is low in the stopped state, so that the exhaust sound is offensive to the ear and always. Since the low-pressure air is supplied, the turbine of the handpiece part may rotate, and there is a problem in safety.

The present invention is intended to solve the above-mentioned problems. An object of the present invention is to improve the conventional air circuit so that low-pressure air is handed for a predetermined short time when it is stopped. It is an object of the present invention to provide a device for preventing internal contamination of a dental handpiece, which is supplied into the piece to maintain a positive pressure state and can solve the above-mentioned conventional problems.

[0006]

The device for preventing internal contamination of a dental handpiece according to the present invention is intended to achieve the above-mentioned object by means of a locking holder attached to a doctor's table. The micropilot valve that is closed when is removed, the drive air valve that is opened by a doctor or the like, and the drive air that is opened by the unpressurized air from the micropilot valve. A select valve connected between the valve and the turbine of the handpiece, a diaphragm valve that is opened by unpressurized air from the micropilot valve and allows high pressure air from the drive air valve to pass, and a diaphragm valve from the diaphragm valve. High-pressure air is allowed to pass through, and a vent hole for exhaust is formed. An automatic flash exhaust valve configured to be capable of adjusting the exhaust amount, and a pipe connected to the automatic flash exhaust valve to open the low pressure air by passing high pressure air to pass low pressure air, and to pass the low pressure air to the hand. It is composed of a master valve that supplies the piece.

[0007]

The internal contamination preventing device for a dental handpiece according to the present invention constructed as described above, when the drive valve operated by a doctor or the like is closed to shut off the high pressure air to the auto flush exhaust valve, Through the exhaust vent hole formed in the flash exhaust valve, while the high pressure air in the pipe connecting the auto flash exhaust valve and the master valve for supplying the low pressure air to the handpiece is exhausted over a predetermined time, the master valve With the valve opened, the low pressure air is supplied to the tip of the handpiece to keep the tip of the handpiece in the positive pressure state for a predetermined time.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an internal contamination preventing device for a dental handpiece according to the present invention will be described below with reference to FIGS. Reference numeral 1 is a handpiece, and a cutting tool 1a for cutting a tooth is detachably attached to the tip of the handpiece.

A is a high pressure air source, W is a water supply source, 2 is a micro pilot valve (hereinafter referred to as MPV2) connected to the high pressure air source A through a filter 3, and is a holder for holding a doctor table. When the handpiece 1 is detached from the locking holder, the valve is closed.

Reference numeral 4 denotes a coolant air valve (hereinafter referred to as CAV4) connected to the high-pressure air source A, which is opened when a doctor steps on it. Further, 5 is a drive air valve (hereinafter referred to as DAV5) connected to the high-pressure air source A, which is opened by the doctor's stepping.

6, 8 and the MPV2 are closed,
A select valve (hereinafter referred to as SV6, 8) that is opened by the unpressurized air from the MPV2 is a diaphragm valve (9) that is similarly opened by the MPV2 being closed and high pressure air being supplied. Below, DF
V9).

The SV6 is a needle valve 1 connected to the CAV4 and the tip of the handpiece 1.
Since it is connected between 0 and 0, when the doctor steps on CAV 4, high-pressure air is supplied to the tip of handpiece 1 via CAV 4, SV 6, and needle valve 10.

Further, the SV8 is connected between the DAV5 and the filter 3'and a needle valve 10 'connected to the turbine of the handpiece 1. Therefore, when a doctor steps on DAV5, high-pressure air is released into DAV5, S.
Since it is supplied to the turbine through V8 and the needle valve 10 ', the cutting tool 1a is rotated at high speed.

Reference numeral 11 denotes an auto flash exhaust valve (hereinafter referred to as ATFV11) having the structure shown in FIG. 2, in which a high pressure air passage 11b and a screw hole 11c are formed in the housing 11a in a direction perpendicular to the passage 11b. A valve seat 11d is formed below the screw hole 11c. Further, a through hole 11e communicating with the outside is formed at a position close to the valve seat 11d. A valve rod 11f having a conical tip is screwed into the screw hole 11c. Note that 11 g is an O-ring.

When high-pressure air flows in the direction of the arrow in the ATFV 11 constructed as described above, the high-pressure air flows out of the through hole 11e into the outside air and out of the outlet. Further, when the high-pressure air from the inlet is shut off, the operation of discharging all the high-pressure air accumulated on the outlet side (including the pipe connected to the outlet side) of the escape hole 11e is performed. And
The discharge time of the high pressure air accumulated on the outlet side is the valve rod 11f.
It can be changed by adjusting the gap between the valve seat 11d and the valve seat 11d.

Reference numeral 12 denotes a master valve (hereinafter referred to as MV12) which is opened by the high pressure air from the ATFV11.
And 13 is a master valve (hereinafter, referred to as MV13) which is opened by the high pressure air from the DAV5. The input side of the MV12 is connected to the needle valve 10 "connected to the high-pressure air source A, and the output side is connected to the input side of the MV13 via the check valve 14 and the check valve 14 '. It is also connected to the turbine of the handpiece 1 via the tip of the handpiece 1 and the check valve 14 ″.

The input side of the MV 13 is also connected to the exhaust portion of the handpiece 1, and the output side is open to the atmosphere. Further, the input side of the DFV9 is connected to the output side of the DAV5, and the output side is connected to the AT via a check valve 15.
It is connected to the input side of FV11.

Next, in order to explain the operation based on the above-mentioned structure, the handpiece 1 locked in the locking holder.
When the valve is removed, the MPV2 is closed and the high pressure air is
The valves of V6, 8 and DFV9 are open. However, in this valve open state, CAV4
Since no high-pressure air is supplied from the DAV5 and the DAV5, the handpiece 1 does not change at all.

In this state, when the doctor steps on the DAV5, the DAV5 is opened, so that high-pressure air is supplied to the turbine of the handpiece 1 via the SV8, and the cutting tool 1
a starts rotating. Further, since the DFV9 is in the valve open state, the high pressure air from the DAV5 is
It is supplied to the MV 12 via the TFV 11, and the MV 12 is also opened.

When the MV 12 is opened, the high pressure air source A
The high-pressure air passes through the needle valve 10 ″ in a state of being reduced in pressure to, for example, 0.5 kg / cm ³ , and is stopped by the check valve 14. Further, the turbine of the handpiece 1 is driven. Exhaust gas is also released into the atmosphere via the MV 13. Further, the low pressure air passing through the MV 12 is stopped by the check valves 14 'and 14 ".

When the doctor steps on CAV4, the CAV4
Since 4 is opened, high pressure air is supplied to the tip of the handpiece 1 via the SV 6. Next, CAV4 and DAV5 to complete or interrupt the doctor's treatment
When you release your foot further, each valve will be closed, so
The turbine of the handpiece 1 stops and the air to the tip also stops.

Further, since the high pressure air supplied to the ATFV 11 via the DFV 9 is also shut off, the supply of the high pressure air to the MV 12 is shut off, but the ATFV 11
Since the through hole 11e is formed in the ATFV
Until the air existing in the pipe of 11 and the MV 12 is discharged from the escape hole 11e, the MV 12 maintains the valve open state.

Therefore, the low-pressure air supplied through the needle valve 10 "is supplied to the handpiece 1 through the MV 12 and the check valves 14 'and 14", and the low-pressure air is discharged from the handpiece 1. This makes the handpiece 1
Since the positive pressure state is maintained at the tip of the, it is possible to prevent dust and the like generated when cutting dirt or teeth from entering.

Then, the ATFV1 is passed through the through hole 11e.
When the air existing in the pipe of 1 and the MV 12 is released into the atmosphere, the MV 12 is closed and returns to the initial state. Therefore, since it is the time until the air is completely discharged from the through hole 11e, the problems caused by noise due to air leakage and the rotation of the cutting tool 1a can be solved. Further, the time for applying the low pressure air to the handpiece 1 is AT
The predetermined time can be set by adjusting the gap between the valve seat 11d and the valve rod 11e in the FV 11.

[0025]

As described above, according to the present invention, when the drive valve operated by a doctor or the like is closed to shut off the high-pressure air to the automatic flash exhaust valve, the exhaust valve formed in the automatic flash exhaust valve is used. Through the through hole, the high pressure air in the pipe connecting the auto flush exhaust valve and the master valve that supplies the low pressure air to the handpiece is discharged over a predetermined time, and the low pressure air is supplied to the tip of the handpiece. I tried to keep it at positive pressure,
It is possible to prevent dust and the like generated when cutting dirty water and teeth from entering.

Further, since the amount of exhaust from the auto flash exhaust valve can be freely adjusted, the positive pressure time at the tip of the handpiece can be adjusted, and therefore, the exhaust sound of low pressure air is only for a short time, so that the noise is reduced. In addition, there is an effect that there is little concern and that even if the cutting tool of the handpiece rotates, there is little possibility of accidental accident.

[Brief description of drawings]

FIG. 1 is an air circuit diagram showing an embodiment of an internal contamination prevention device for a dental handpiece according to the present invention.

FIG. 2 is a cross-sectional view of an auto flash exhaust valve.

[Explanation of symbols]

 1 Handpiece 1a Cutting tool 2 Micro pilot valve 5 Drive air valve 8 Select valve 9 Diaphragm valve 11 Auto flush exhaust valve 12 Master valve

Claims (1)

[Claims] 1. A micropilot valve 2 that is closed when the handpiece 1 is removed from a locking holder attached to a doctor table, and a drive air valve that is opened by a doctor or the like. 5, a select valve 8 connected between the drive air valve and the turbine of the handpiece, which is opened by unpressurized air from the micropilot valve, and opened by unpressurized air from the micropilot valve. A diaphragm valve 9 which is in a valve state and allows high pressure air from the drive air valve to pass through, and a high pressure air from the diaphragm valve that passes through and a vent hole 11d for exhaust are formed, and the amount of this exhaust can be adjusted. Auto flash exhaust valve 11
And a master valve 12, which is connected to the auto flush exhaust valve 11 by a pipe, is opened by high pressure air passing therethrough, allows low pressure air to pass therethrough, and supplies the low pressure air that has passed to the handpiece. An internal contamination prevention device for a dental handpiece, which is characterized in that