JPS6216105B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present application provides a dental treatment chair equipped with an operation control circuit that automatically moves the backrest up and down, raises and lowers the seat, and tilts the seat as necessary. If a part of the patient's body, clothing, or a foreign object such as a foot controller accidentally gets caught in the operating mechanism during the movement, the movement should be stopped immediately and the movement should be moved in the opposite direction to the direction in which the movement is progressing. The purpose of this is to prevent failures caused by the above-mentioned abnormal conditions by switching the operation.

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 the treatment chair can be returned to its normal position by operating an automatic return switch when dental treatment is completed. 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, When the patient is in the inactive position, especially during the latter movement when the treatment is finished and the patient is in a tension-free state and the treatment chair is lowered. There is a risk that a part of the body or clothing may accidentally intervene in the operating mechanism, or that the foot controller may get caught and cause an injury. 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 use of the treatment chair, especially during the process of the treatment chair moving from the working position to the non-working position. To be more specific, FIG. 1 is an operational circuit diagram of the system, in which reference numeral 1 denotes an operating section provided, for example, on the side of the backrest of a treatment chair, and a manual set switch 2.
, a manual reset switch 3 , an automatic reset switch 4 , and an automatic reset switch 5 are provided, and each of the switches 2 to 5 is connected to a power supply 7 (which can be either AC or DC) via a voltage adjustment circuit 6 . )It is connected to the. 8 is the operation section 1
As shown in FIG. 2, this foreign object detection switch is connected between the switch 2 and the voltage adjustment circuit 6, and is attached to the lifting/lowering mechanism C of the seat B of the treatment chair A, for example, as shown in FIG. When a foreign object is interposed between the elevating mechanism C and the floor D, the energized state is cut off by the tilting action of a tilting plate E attached to the operating mechanism C. , functions to energize only the manual set switch 2. In addition, in Figure 2, F
is the back crest, the solid line indicates the inoperative position, and the broken line indicates the operating position. 9 is treatment chair A
This is an operation memory circuit connected to the voltage adjustment circuit 6, and the circuit 9 is operated by the automatic set signal a from the automatic set switch 5 to adjust the driving body 1.
an automatic reset circuit 10 that operates the actuator 12 in a direction to move the treatment chair A from the non-operating position to the operational position; and an automatic reset signal b from the automatic reset switch 4, which operates the driver 12 to move the treatment chair A to the operational position. The automatic reset circuit 11 has an automatic reset circuit 11 that operates in the direction of shifting from the position to the inoperative position, and the automatic reset circuit 10 receives an upper limit signal c from the outside.
Automatic reset circuit 1 that cancels the operation by
0', and each automatic reset circuit 11 is provided with an automatic reset release circuit 11' which cancels its operation in response to an external lower limit signal d. 13 generates an upper limit signal c and a lower limit signal d when the treatment chair A reaches the extreme limits of the operating position and the inoperative position, respectively, and transmits these to the automatic reset release circuit 10' and the automatic reset release circuit 11'. Limit circuits to be inputted respectively, 14
is a drive relay circuit that controls forward and reverse rotation of the drive body 12, etc.

When the treatment chair A is automatically set from the non-operating position to the operating position, the automatic set switch 5 is operated. Then, the automatic set signal a operates the automatic set circuit 10, which causes the driver 12 to raise the seat B, lower the backrest F, and guide the treatment chair A to the operating position. When the maximum operating position is reached, the automatic set release circuit 10' is activated by the upper limit signal c from the limit circuit 13, and the treatment chair A is activated.
is automatically set to the operating position. Further, when returning the treatment chair A to the inoperative position from this state, the automatic reset switch 4 is operated. Then, the automatic reset signal b activates the automatic reset circuit 11, which causes the driver 12 to move to the seat B.
is lowered and the backrest F is raised, that is, the driver 1
2 is driven in the opposite direction to the above to guide the treatment chair A to the inoperative position, and when the treatment chair A reaches the limit of its inoperable position, it is automatically reset by the lower limit signal d from the limit circuit 13. The release circuit 11' is activated and the treatment chair A automatically returns to the inoperative position. After the treatment chair A is automatically set to the operating position in this manner, the basic posture of the treatment chair is corrected by manual operation as necessary. When manually performing correction from the non-operating position to the operating position, the manual set switch 2 is operated. Then the current flows through drive relay circuit 1
4 to a drive 12 which corrects the treatment chair A from the inactive position towards the active position. This operation is performed by manual set switch 2.
It will last as long as you continue to operate. Further, when attempting to correct the treatment chair A in the direction of the inoperative position from this state, the manual reset switch 3 is operated.
Then, the current flows through the relay circuit 14 to the driver 12.
Then, the driving body 12 is driven in the opposite direction to correct the treatment chair A from the operating position to the inoperative position. This operation also continues as long as the manual reset switch 3 continues to be operated. All of the above described operations in a normal state, but in such a configuration, for example, a foreign object may be caught in the lifting mechanism C of the seat B while the treatment chair A is being guided from the operating position to the inactive position, and the foreign object may be detected. Assume that the switch 8 is switched to the position indicated by the broken line in FIG. Then, the power to each of the switches 2 to 5 of the operating section 1 is cut off, all of which are turned off, and only the manual set switch 2 is energized, resulting in the same state as if the manual set switch 2 had been operated. Assuming that the movement from the operating position to the non-operating position is due to the operation of the automatic reset switch 4, the automatic reset release circuit 11' is in an operable state, so the operation signal e of the foreign object detection switch 8 is activated.
is applied to the automatic reset release circuit 11' to disable the circuit 11'.

However, as already mentioned, the operation control circuit is
It operates in the same manner as when the manual set switch 2 is operated, and therefore the driver 12 drives the treatment chair A in a direction that leads the treatment chair A from the inoperative position to the operative position. That is, the treatment chair A is driven in the opposite direction to the direction in which the foreign object was caught, and as a result, the foreign object is automatically released from the lifting mechanism C. Then, the foreign object detection switch 8 is switched from the position shown by the broken line to the position shown by the solid line in FIG. , the operation control circuit is restored to its normal operating state. This foreign object release operation is performed in the process of manually guiding the treatment chair A from the operating position to the non-operating position by operating the manual reset switch 3.
The same thing applies when a foreign object gets caught in the lifting mechanism C.

That is, in the process of operating the manual reset switch 3 and guiding the treatment chair A from the operating position to the non-operating position,
If a foreign object is caught, the foreign object detection switch 8
However, the state changes to the state indicated by the broken line in Fig. 1, and the power to the manual reset switch 3 is cut off, stopping the operation in the inoperative position, and only the manual set switch 2 is energized, so that the manual In the same state as when the set switch 2 is operated, the treatment chair A moves in the direction of the operating position, and this operating state continues until the foreign object detection switch 8 is switched to the state shown by the solid line in FIG. Next, after the operation of the operating position of the treatment chair A has stopped, by operating the manual reset switch 3 again, the treatment chair A is
returns to the inoperative position.

The above description is about the case where a foreign object is caught in the process of guiding the treatment chair A from the working position to the non-working position. In this case, the operation control circuit in FIG. It is sufficient to connect the voltage to the release circuit 10'.

As described above, according to the present application, when a foreign object gets caught in the operating mechanism of the treatment chair while it is in operation, the treatment chair is automatically driven in the opposite direction to the movement direction and releases the foreign object, which is extremely safe. It has the advantage of being versatile in its uses.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application; FIG. 1 is a circuit, and FIG. 2 is a side view of a treatment chair. In the figure, 1 is the operation unit, 2 is the manual set switch, and 3
is a manual reset switch, 4 is an automatic reset switch, 5 is an automatic reset switch, 7 is a power supply, 8 is a foreign object detection switch, 9 is an operation memory circuit,
10 is an automatic set circuit, 10' is an automatic reset release circuit, 11 is an automatic reset circuit, 11' is an automatic reset release circuit, 12 is a driver, 13 is a limit circuit, and 14 is a drive relay circuit.

Claims (1)

[Claims] 1. Dental treatment in which a driving body is controlled so as to be movable between an inoperative position where the seat is lowered and the backrest is raised, and an activated position where the seat is raised and the backrest is laid down. In the motion control circuit of the chair, maintaining the supply of operating power to the motion control circuit at all times,
Operation of a dental treatment chair, characterized in that it is equipped with a foreign object detection switch that switches to cut off the power supply when a foreign object is present in the operating mechanism of the treatment chair, and also supplies a drive signal in the reverse direction to the drive body. control circuit. 2. The operation control circuit for a dental treatment chair according to claim 1, wherein the drive signal is a signal in a direction to drive the treatment chair from an inactive position to an activated position. 3. The operation control circuit for a dental treatment chair according to claim 1, wherein the drive signal is a signal in a direction to drive the treatment chair from an operating position to an inoperative position.