JPS6216104B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to a dental treatment chair equipped with an automatic control device that automatically adjusts the elevation of the backrest, raises and lowers the seat, and tilts the seat as necessary. If a part of the patient's body or clothing accidentally gets caught in the moving part, the above-mentioned abnormal condition can be avoided by immediately stopping the movement and switching the movement in the opposite direction to the direction in which the movement is progressing. The present invention relates to an operation protection circuit intended to prevent such failures.

Dental treatment chairs are generally equipped with a function to raise and lower the backrest, a function to raise and lower the seat, and a function to tilt the seat, and each of these functions can be operated individually using a dedicated manual switch. In order to eliminate the inconvenience of using the treatment chair, the basic posture of the treatment chair that the technician uses most frequently (varies depending on the technician) is memorized in advance in the memory circuit, and when using the chair, the user can simply turn on the automatic start switch. Just by operating the chair, the treatment chair will automatically be guided to the planned basic posture. After the treatment chair is set to the basic posture, if it becomes necessary to make some corrections to the chair posture, you can use the manual switch. The basic posture of the treatment chair can be corrected by operating each function of the chair individually, and when dental treatment is completed, the treatment chair can be returned to its normal position by operating an automatic return switch. Dental treatment chairs constructed in this manner are known, for example, in Japanese Patent Publication No. 53-41477, Japanese Patent Publication No. 53-41478, and Japanese Patent Publication No. 54-30233.

However, in a configuration in which each operating part of the treatment chair is automatically controlled between the non-operating position, which assumes the normal position, and the operating position, which assumes the basic posture, During the movement of the treatment chair from the inactive position to the inactive position, especially during the latter movement when the treatment is finished and the patient is left in a state of relief, the patient moves on the chair and any part of his body is affected. There is a risk that parts or clothing may accidentally interfere with the moving parts and cause damage. In this case, conventionally, the above-mentioned trouble could be prevented by operating a stop switch to stop the operation of the treatment chair midway, and then operating, for example, an automatic start switch to change the direction of operation of the treatment chair. However, this operation is troublesome, and there is also the risk that errors in operation of the automatic start switch and automatic return switch may cause more trouble.

Therefore, the present application aims to eliminate the above-mentioned inconveniences and ensure safe operation of the treatment chair, especially during the process of the treatment chair moving from the working position to the non-working position. In detail, Figure 1A shows the inoperative position of the treatment chair with seat A lowered in a horizontal state and backrest B standing up, and Figure 1B shows the inoperative position of the treatment chair with seat A rising and tilting slightly backwards and backrest B standing up. shows the operating position of the treatment chair in prone sitting treatment. Second
The figure shows a block diagram of a control device in a treatment chair, and this control device 1 includes a manual seat lift actuator 2 that is operated by a manual button 2' to raise and lower the seat of the treatment chair; A manual seat tilting movement part 3 which is operated by a manual button 3' to tilt the seat of the treatment transferrer; and a manual backrest raising/lowering part which is operated by a manual button 4' and raising and lowering the backrest of the treatment chair. In addition to the actuator 4, there is a position setting potentiometer that stores the operating position of the treatment chair, for example, and when the manual button 5' is operated in one direction a, the treatment chair is moved via the switch S _a as shown in FIG. a first automatic control circuit 5a that automatically operates from an inoperative position shown by 1 to an operative position shown _by
a second automatic control circuit 5b that automatically moves the treatment chair from the operating position shown in FIG. 1B to the inoperative position shown in FIG.
The automatic control unit 5 is configured to stop the automatic operation at an arbitrary position by using the automatic control unit 5, and the known control unit shown in the above-mentioned patent publication is used as a specific configuration thereof. S _p is the main switch.

FIG. 3 shows a block diagram of the protection circuit of the present application, which consists of a diode _D1 , a relay coil _L1 as an operating element for operating the switch _Sb , and a resistor _R1 connected in series. The first
Series circuit 6, timer T, and diode D ₂
and a capacitor C connected in parallel with a relay coil _L2 serving as an operating element for operating the switch S _a.
A second series circuit 7 formed by connecting a resistor R ₂ and a resistor R 2 in series is connected in parallel, and a DC power supply circuit 8 is connected to this parallel circuit via, for example, a foot switch S _f .

Now, when the manual button 5' is operated in the direction b, switch S _b is turned on and switch S _a is turned off, the second automatic control circuit 5b is activated, and the treatment chair is moved from the working position to the non-working position. In the process of operating, for example, in an abnormality where the patient's fingers or clothes are caught between the armrest and backrest, or between the backrest and the seat, the foot movement switch S
Operate _f momentarily. Then, the relay coil _L1 of the first series circuit 6 is excited and turns off the switch _Sb .
Then, the switch S _a is turned on by excitation of the relay coil L ₂ of the second series circuit 7 . In this case, switch S _a operates slightly later than switch S _b due to a time constant determined by capacitor C and resistor R ₂ of second series circuit 7. As a result, the operation of the treatment chair in the inoperative position is stopped, and the treatment chair is switched to the operation position, and the operation in the operation position is continued for a period of time (several seconds) set by the timer T. be exposed. After the circuit of the timer T is cut off, the excitation of the relay coil _L2 is maintained for the discharge time of the capacitor C, and then the operation of the treatment chair toward the operating position is also stopped.

Therefore, it is possible to reliably remove fingers, clothes, etc. caught in the moving parts of the treatment chair. When moving the treatment chair from the non-operating position to the operating position, the manual button 5' is operated in the direction a. Then, the switch S of the first automatic control circuit 5a
_a is ON, switch S _b of the second automatic control circuit 5b
switches to the OFF state and moves to the operating position. In this case, the relay coil of the first series circuit 6
When L ₁ corresponds to switch S _a and relay coil L ₂ of the second series circuit 7 corresponds to switch S _b , when the treatment chair moves from the inactive position to the activated position, It is possible to eliminate the abnormal condition that occurs.

As described above, according to the present application, by operating the switch provided in the protection circuit, the progress of the motion of the treatment chair is automatically stopped, and the direction of the progress of the motion is changed to change the progress of the motion for the required time. Since it can be automatically advanced in the opposite direction, it has advantages such as easy operation, no risk of malfunction, safe use, and high responsiveness.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a diagram showing the operating state of the treatment chair, FIG. 2 is a block diagram showing the control device of the treatment chair, and FIG. 3 is a block diagram of the protection circuit. In the figure, 1 is the control circuit, 5' is the manual button, and 5a is the first
automatic control circuit, 5b is a second automatic control circuit, 5 is an automatic control section, 6 is a first series circuit, 7 is a second series circuit, 8 is a DC power supply circuit, D ₁ and D ₂ are diodes,
S _a and S _b are switches, L ₁ and L ₂ are relay coils, and C
is a capacitor, T is a timer, R ₁ and R ₂ are resistors,
S _f is an actuation switch.

Claims (1)

[Claims] 1. Has the function of raising and lowering the seat base and the function of raising and lowering the backrest, and the first
A first automatic control circuit that automatically controls the posture of the chair from an inactive position in which the treatment chair takes a normal position to an active position in which the treatment chair takes a basic posture suitable for treatment through a switch, and a second automatic control circuit that automatically controls the posture of the chair through a switch. and a second automatic control circuit for automatically controlling the posture of the chair from the operating position to the inoperative position through the dental treatment chair, wherein one of the first and second switches is ON and the other is ON. When the switch is in the ON state while it is in the OFF state,
A first circuit having an operating element for switching to OFF, and a timer that allows energization for a predetermined period of time are connected to the operating element for switching the switch that is OFF in the operating state to ON with a slight delay from the above. connected in parallel with a second circuit consisting of
An operation protection circuit for a dental treatment chair is constructed by connecting a DC power supply circuit to this parallel circuit via an operation switch. 2 The switching element of the first circuit is in the ON state.
The dental device according to claim 1, wherein the switch is for switching the switch to the OFF state, and the switching element of the second circuit is for switching the OFF state of the first switch to the ON state. Treatment chair operation protection circuit.