JPS6157779B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dental handpiece that cuts teeth by rotating an air turbine or an air motor driven by pressurized air, and a dental handpiece that performs dental treatment by ejecting pressurized air from a tip nozzle. For example, in a dental unit equipped with multiple dental treatment instruments that perform dental treatment using pressurized air, such as a dental syringe, even when one treatment instrument is in use, other treatment instruments can be used without any problem. The present invention relates to a pressurized air control device for a dental treatment instrument that allows parts such as the cutting bar of a handpiece and the ejection nozzle of a syringe to be replaced or to repair defective parts. Normally, dental units have a handpiece that is driven by multiple pressurized airs with different rotational speeds and rotational torques to cut teeth, etc., and a nozzle at the tip, which the technician can select according to the type of treatment. It is equipped with dental treatment instruments such as syringes that spray compressed air, water, or mist to dry and clean the affected area.
Each hanger that supports the treatment instrument in its restored state is equipped with an air signal switch that controls the supply of pressurized air, and when the treatment instrument is removed from the hanger, the air signal switch is activated to start the treatment. The apparatus is configured to supply pressurized air to the instrument. Therefore, according to the conventional arrangement, while a technician is performing dental treatment with a treatment instrument that has been removed from the hanger, an assistant removes it from the hanger, for example to replace a cutting bar on another handpiece. In this case, the handpiece is also driven by the supply of pressurized air from the air signal switch, which makes it difficult to perform tasks such as replacing parts of other treatment instruments while performing dental treatment with one treatment instrument. However, it has the disadvantage that it cannot be performed, and the efficiency of treatment is thereby impaired.

Therefore, the present application is intended to improve such defects, and embodiments of the present application will be described in detail below with reference to the drawings.
For convenience of explanation, FIG. 1 shows two dental treatment instruments, and each treatment instrument has a pressurized air passage for driving (actually, it is equipped with a tip air passage and a water passage).
The solid line in the figure shows the pressurized air path for driving the treatment instrument, and the broken line shows the pressurized air path for control signals. The air source 1 includes an operation valve 2 such as a foot controller that communicates with the atmosphere in a normal state and switches to a conductive state when the foot is pressed to control the supply of pressurized air for driving, and dental treatment instruments 3a having different rotational torques, for example. , 3b, respectively, and is connected to the hanger air switch 4 when the latching condition is released.
a and 4b are connected to each other. Said operation valve 2
Main valves 5a, 5 are connected to the output end of the main valves 5a, 5, which are connected to the atmosphere in the normal state and connected to the atmosphere when activated, which are connected by the air signal.
b are connected respectively, and these main valves 5a, 5
Each of the dental treatment instruments 3 is connected to the pressurized air output end of b.
a and 3b are connected. The output end of the one hanger air switch 4a is connected to a signal input end of a first signal valve 6a which communicates with the atmosphere in normal state and conducts during operation, which gives an air signal to the main valve 5a, and a check valve 7a. The signal input end of the second signal valve 8a which is normally conductive and closes when activated is connected to the pressurized air input end of the second signal valve 8a, and the pressurized air of the second signal valve 8a is connected to the pressurized air input end of the second signal valve 8a. The output end and the pressurized air input end of the first signal valve 6a are connected, and the pressurized air output end of the first signal valve 6a and the signal input end of the main valve 5a are connected, respectively. A muffler 10 communicating with the atmosphere is connected to the signal input end of the second signal valve 8a via a flow rate regulating valve 9. Such a configuration is applicable to the other hanger air switch 4.
The output end of the second signal valve 8b is also provided at the output end of the second signal valve 8b.

When one of the treatment instruments 3a is held from the hanger, the hanger air switch 4a is switched to a conductive state, and the pressurized air is supplied to the first and second signal valves 6a, 6a, and 6a, respectively, via the hanger air switch 4a.
8a to the signal input end of the first signal valve 6a.
is switched to a conductive state, and the second signal valve 8a is switched to a closed state with a slight delay. Therefore, the pressurized air that has passed through the hanger air switch 4a is instantaneously input to the signal input terminal of the main valve 5a, and the main valve 5a is switched to the conductive state, and the signal input to the main valve 5a is caused by the closing of the second signal valve 8a. After that, the compressed air is held between the output end of the pressurized air and the signal input end of the main valve 5a to maintain the conductive state of the main valve 5a. On the other hand, a portion of the pressurized air input to the signal input end of the second signal valve 8a is supplied to the flow rate adjustment valve 9.
and is released into the outside air via the muffler 10,
Since the air pressure at the input end of the flow rate regulating valve 9 is higher than that at its output end, the supply of signal input to the second signal valve 8a is maintained.

However, when pressing the operating valve 2 from the lever position,
Pressurized air is supplied to the handpiece 3 via the foot controller 2 and the main valve 5a which is in a conductive state.
A is supplied to the handpiece 3a, and the handpiece 3a operates.

In the above, when one hand piece 3a is held in hand, a portion of the pressurized air supplied to the signal input end of the second signal valve 8a is supplied to the check valve 7b of the other hand piece 3b and the second signal valve 8b. Since the pressurized air is also supplied to the signal input terminal and the supply direction is opposite to the check valve 7b, the pressurized air is supplied only to the signal input terminal of the second signal valve 8b, and the valve 8b is closed. Change. When the other handpiece 3b is held in this state for parts replacement etc., the hanger air switch 4b is switched to the conductive state and the pressurized air is supplied to the first
The signal is supplied to the signal input end of the signal valve 6b, and the valve 6b is switched to a conductive state. However, a second signal valve 8b communicating with this first signal valve 6b
Since the hanger air valve 4b is already in the closed state, the pressurized air from the hanger air valve 4b is cut off by the second signal valve 8b and is not supplied to the signal input end of the main valve 5b. maintains a non-conducting state and the handpiece 3b does not operate.

In this state, when the first handpiece 3a is returned to the hanger, the hanger air switch 4a communicates with the atmosphere and the first signal valve 6
The supply of signal input to the handpiece 3a and the main valve 5a is cut off, and these are also restored, and the operation of one handpiece 3a is stopped. On the other hand, the supply of the air signal from the hanger switch 4a to the second signal valve 8a is cut off, but since the air signal is supplied from the other hanger switch 4b, the second signal valve 8a maintains a non-conducting state. . That is, while any one handpiece is held in hand, the second signal valves 8a corresponding to all the handpieces maintain a non-conducting state, and therefore do not operate at a length where the other handpiece 3b, which was held later, continues to be held in hand. In this state, when you later try to operate the other handpiece 3b that you are holding, or when you are trying to operate one of the handpieces 3a while holding it again, you must first turn the other handpiece 3b that you are holding onto the hanger switch. This is done after all the circuits have been returned to the state shown in FIG. 1 by being hooked to 4b or actuated by a finger.

FIG. 2 shows a specific embodiment in which the configuration shown in FIG. Passage 14a, 14
b shows an air turbine handpiece comprising: 15, 16 and 17 are valves, filters and pressure reducing valves connected to the pressurized air source 1; 18 is a high/low pressure switching valve; 19 is a foot valve for chip air; 20
is a water valve, in which a high/low pressure switching valve 18 and a chip air foot valve 19 are connected to the pressurized air source 1, and a water valve 20 is connected to the output end of the chip air foot valve 19, respectively. 21a and 21b are chip air passages 13a and 1
Chip air valves 22a and 22b are respectively connected to the output ends of the water foot valve 20, and 23 is a water supply source, which includes a valve 24, a filter 25, Check valve 2
6, a valve 27, and a pressure reducing valve 28 are connected in series. 29a, 29b are water passages 14a, 14
The water control valves 22a and 22b respectively connected to b.
It is a water valve that is operated by signal input.
The dashed line shows the air signal circuit. Note that the same symbols as in FIG. 1 indicate the same members.

The supply relationship of pressurized air for driving and signals in FIG. 2 is the same as that in FIG. 5a, the chip air valve 21a, the water control valve 22b, and the water valve 29a are also opened at the same time.
Therefore, the tip air foot valve 19 and the water foot valve 2
0 together with the operation valve 2, tip air and water are supplied to the handpiece 11a. This effect is the same when the other hand piece 11b is held in hand.

FIG. 3 shows another embodiment in which the air signal circuit for operating the main valves 5a and 5b in the circuit shown in FIG. 1 is modified.

That is, as each first signal valve, the valve 6 communicates with the atmosphere under normal conditions and is in a non-conducting state when activated.
a', 6b', and the second signal valve 8a,
The air input ends of the valves 6a' and 6b' and the air signal input ends of the main valves 5a and 5b were respectively connected to the air output end of the valve 8b, and the other configuration was the same as that shown in FIG. It is something. According to this configuration, under normal conditions, the hanger switch 4
A part of the signal air output from the second signal valves 8a to 8b and 6a to 6
b to the atmosphere, so that the air signal to the main valves 3a-3b is zero and inactive. When an air signal is input to the first signal valves 6a to 6b from this state, they are switched to a non-conducting state and the second signal valves 8a to 8
The signal air from the main valves 3a and 3b is input to the main valves 3a and 3b, respectively, and the handpieces 3a and 3b are operated, and the other operations are the same as those shown in FIG.

In each of the above embodiments, the hanger air switch closes when the therapeutic instrument is hung on the hanger and becomes conductive when the therapeutic instrument is removed from the hanger. Of course, in the case of the support device shown in FIG. It is.

As described above, according to the present application, when a technician is using any one treatment instrument for dental treatment, an assistant or the like can perform other treatment as necessary without interfering with the treatment work. You can easily carry out parts replacement or repair work while holding the instruments in your hand, and you can even return the first one to its original position when two or more instruments are being held in your hands. It has the advantage of being complete and extremely convenient to use, since the other treatment instrument is not activated immediately.

[Brief explanation of the drawing]

The drawings show examples of the present application, with FIG. 1 showing the basic configuration, and FIG. 2 showing the specific configuration.
FIG. 3 shows another embodiment corresponding to FIG. 1. In the figure, 1 is a pressurized air source, 2 is an operating valve, 3a, 3b
are treatment instruments, 4a, 4b are hanger air switches, 5a, 5b are main valves, 6a, 6b, 6
a' and 6b' are first signal valves, 7a and 7b are check valves, 8a and 8b are second signal valves, and 9 is a flow rate regulating valve.

Claims (1)

[Scope of Claims] 1. A normally closed operation valve and a plurality of air switches arranged relative to the number of treatment instruments and activated by the engagement or removal of the treatment instruments are respectively connected to a pressurized air source, A plurality of main valves, which are normally non-conducting and become conductive when an air signal is input, are connected to the output side of the valve corresponding to each treatment device, and a treatment device is connected to each output end of the main valve, and a treatment device is connected to each output end of the main valve. On the output side of each air switch, there is a signal input end of the first signal valve that is normally non-conductive and becomes conductive when an air signal is input, and a signal input end of the first signal valve that is normally conductive but becomes non-conductive when an air signal is input via a check valve. A signal input end of a second signal valve is connected to a pressurized air input end of the second signal valve, and pressurization of the first signal valve corresponding to a pressurized air output end of the second signal valve is connected. The air input end and the pressurized air output end thereof are connected to the corresponding signal input end of the main valve, and the signal input end of each of the second signal valves is connected to a flow rate adjustment valve communicating with the atmosphere, respectively. A pressurized air control device for a dental treatment instrument characterized by: 2. A normally-closed operating valve and a plurality of air switches arranged relative to the number of treatment instruments are connected to the pressurized air source and are activated when the therapeutic instruments are engaged or removed, respectively, and on the output side of the operating valve, A plurality of main valves which are normally non-conductive and conductive when an air signal is input are connected to each treatment device, and a treatment device is connected to each output end of the main valve, and a main valve is connected to the output side of each air switch. , a signal input end of a first signal valve that normally communicates with the atmosphere and closes when an air signal is input;
a signal input end of a second signal valve that is normally conductive via the check valve and becomes non-conductive upon input of the air signal;
The pressurized air input ends of the second signal valves are connected to each other, and the pressurized air output ends of the second signal valves are connected to the corresponding pressurized air input ends of the first signal valve and the signal input of the main valve. A pressurized air control device for a dental treatment instrument, characterized in that a flow rate regulating valve is connected to each end of the second signal valve and communicated with the atmosphere to a signal input end of each of the second signal valves.