JP2006122384A - Automatic height adjuster for dental chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic height adjuster for dental chair, with which the dental chair height is automatically adjusted to the height of a spittoon basin according to the vertical movement of a pillow moved vertically according to the height of a patient and the dental chair height is automatically adjusted in a correlation with the lying angle of the backrest of the chair even when shifting into the state of treatment. <P>SOLUTION: The automatic height adjuster for the dental chair is formed so that the height of the spittoon basin (b) is coincident with the mouth rinsing height of the patient sitting in the chair by adjusting the height of a seat part 2 to a prescribed height according to the displacement of the pillow 31 mounted to vertically moved to the backrest 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention automatically raises the chair to the position of a spit-on ball for the patient to gargle according to the height of the patient sitting on the dental chair (hereinafter simply referred to as a chair) The present invention relates to an automatic height adjustment device for a dental chair that automatically raises the chair to a position where it is easy to practice according to the height of the dentist.

Conventionally, as a technique for adjusting the height of a chair according to the height of a patient, for example, there is a device disclosed in Japanese Utility Model Publication No. 6-20513. This device is provided with a fixed portion for fixing the chair to the floor, a treatment table that moves up and down with respect to the fixed portion, and a scale that displays the elevation of the treatment table with respect to the fixed portion. Each of them is detected and displayed on the display unit. In either case, the dentist moves the chair up and down while checking the scale and the value of the display unit so that the dentist can easily perform his / her treatment. .
Japanese Utility Model Publication No. 6-20513

  By the way, in the above-described conventional example, the chair is set at the remembered height while observing the scale and the display value so that the dentist remembers in advance the treatment site and treatment content. Therefore, it is troublesome to operate, and it is necessary to memorize the value of the scale of the height position. However, there was a problem that the treatment table could not be stopped.

  The present invention is intended to solve the above-mentioned problems, and the object of the present invention is to adjust the height of the chair at the height of the spit-on ball according to the amount of vertical movement of the pillow that moves up and down according to the height of the patient. The chair height is automatically adjusted, so the dentist does not need to adjust the chair height at all. Therefore, an object of the present invention is to provide an automatic height adjusting device for a dental chair that can always perform a treatment work in an optimum state with the treatment position always being the optimum position.

  The automatic height adjusting device for a dental chair according to the present invention achieves the above-mentioned object, and the means of claim 1 is responsive to the amount of displacement of a pillow mounted so as to be movable up and down with respect to the backrest. By adjusting the height of the seat to a predetermined height, the spit-on ball and the gargle height of the patient sitting on the chair are made to coincide with each other.

  The means of claim 2 comprises a seat part that can move up and down, a backrest that can be raised and lowered relative to the seat part, and a pillow that is attached to the upper part of the backrest so as to be movable up and down. In a dental chair, a seat height detection sensor for detecting the amount of vertical movement of the seat, a pillow height detection sensor for detecting the amount of vertical movement of the pillow, and the pillow height detection sensor by moving the pillow up and down When the seat height detection sensor detects a predetermined height value according to the amount of displacement detected, the control means stops the vertical movement of the seat, and the seat is stopped by the control means. The adjusted position is adjusted so that the height positions of the spit-on balls for the patient to gargle match.

  According to a third aspect of the present invention, there is provided a seat portion that can move up and down, a backrest that can be raised and lowered relative to the seat portion, and a pillow that can be moved up and down on the backrest. In the dental chair, a seat height detection sensor for detecting the vertical movement amount of the seat portion, a backrest angle detection sensor for detecting the sleeping angle of the backrest, and a pillow height for detecting the vertical movement amount of the pillow The seat height detection according to the height detection sensor and the amount of displacement detected by the pillow height detection sensor by moving the pillow up and down, and the amount of sleeping angle of the backrest angle detection sensor When the sensor detects a value of a predetermined height, it comprises control means for stopping the vertical movement of the seat, and the position where the seat stops by the control means is the treatment height of the dentist and the treatment site of the patient Adjust so that the height position matches.

  According to a fourth aspect of the present invention, in the first or second aspect described above, the value of the predetermined height amount by the control unit can be changed according to the height of the dentist or the like.

  According to a fifth aspect of the present invention, in the first or second aspect, the value of the predetermined height amount by the control means is a value obtained from an experiment in advance with respect to the pillow height amount as a height value of the seat portion. It is stored in a memory, and the height of the seat is adjusted by determining the value stored in the memory corresponding to the value from the pillow height sensor that has detected the pillow height. To do.

  According to a sixth aspect of the present invention, in the first or second aspect, the pillow height detection sensor holds a value from a preset reference position, and controls the raising / lowering of the seat with respect to the held value. Is characterized by being controlled.

  As described above, the present invention automatically adjusts the height of the chair so that it is easy to gargle with a spit-on ball by moving the pillow up and down according to the height of the patient. Regardless of the height difference, it is possible to reduce the load of the patient's gargle operation.

  In addition, the height of the chair is adjusted in correlation with the angle of the backrest by moving the pillow up and down according to the patient's height during the operation, so the dentist's height, sitting position or standing position can be adjusted. In the treatment, the patient and the dentist can face each other in an optimal posture and perform the treatment in an easy posture, and can reduce the trouble of fine adjustment for adjusting the height of the chair.

  Furthermore, since the height of the chair can be changed in advance according to the height of the dentist, etc., even if multiple dentists use the same dental chair, each dentist can set the patient at his preferred height position. Therefore, treatment can be performed in an optimal medical condition.

  Further, by storing the height of the chair relative to the height of the pillow in the memory, the height of the chair can be adjusted to an optimum state by simple control means. Furthermore, by using a sensor that holds the height position of a potentiometer or the like as the pillow height detection sensor, a means for storing the pillow height position is not required, so a low-cost nonvolatile memory can be adopted as the memory. In addition, since the memory having a small capacity is sufficient, the configuration of the control means is simplified and the cost can be reduced.

  The present invention adjusts the height of the seat to a predetermined height in accordance with the amount of displacement of the pillow mounted so as to be movable up and down with respect to the backrest.

Hereinafter, an embodiment of an automatic height adjusting apparatus for a dental chair according to the present invention will be described with reference to the drawings.
1 to 4 show the structure of a dental chair, FIG. 1 is a perspective view with the seats and the like removed from the back side, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a backrest portion of FIG. FIG. 4 is a perspective view of the front sag viewed from the back side.

  In the figure, reference numeral 1 denotes a known seat raising / lowering mechanism for moving the seat 2 up and down, a lifting cylinder 12 having one end fixed to the base 11 and the other end attached to the back surface of the seat 2, and the seat The slide mechanism 13 has one end attached to the center position 2 and the other end attached to the base 11.

  Further, in the seat raising / lowering mechanism of the present invention, the link mechanism 14 including a link 14b having one end pivotally supported on the side of the seat 1 that moves up and down and the other end pivotally supported on another link 14a, A seat height detection sensor, which is a potentiometer fixed to the pedestal 11 side, which is attached to a rotating shaft, and a gear 15a that is attached to the link 14b of the link mechanism and meshes with a gear 14c that rotates as the link 14b rotates. 15 are attached. Here, the seat height detection sensor 15 is not limited to a potentiometer, and may be any sensor that detects the height of the seat 2 such as an encoder.

  When the raising / lowering means of the seat part 2 configured in this way is inputted to a control circuit provided on the chair side by a control means for performing various controls described later, a pump (not shown) The oil is driven to supply oil into the seat cylinder 12 to raise the seat 2. When the seat 2 is raised, the link mechanism 14 is displaced and the gear 14c of the link 14b rotates the gear 15a of the seat height detection sensor 15. Therefore, the amount of change from the seat height detection sensor 15 is controlled by the control means. Sent out. Therefore, the control means can grasp the rising amount of the seat portion 2 by monitoring the change amount.

  When a command to lower the seat portion 2 is issued from the control means, an electromagnetic valve for draining oil from the lifting cylinder 12 is operated and the seat portion 2 is lowered. As described above, the seat height detection sensor 15 is actuated by the lowering of the seat portion 2, and the change amount is sent to the control means. In addition, although the cylinder was used as the raising / lowering means of the said seat part 2, you may make it raise / lower the seat part 2 using a well-known motor.

  3 is a backrest that is rotatably supported behind the seat portion 2 described in detail in FIG. 3, and a seat for raising and lowering the backrest 3 between the seat portion 2 and the backrest 3. A part cylinder 21 is attached, and a spring 22 for raising the lying backrest 2 is attached. Also, a link 23a having one end pivotally supported at the lower end of the backrest 3, a connection link 23b pivotally supported by the other end of the link 23a, and one end pivotally supported by the other end of the connection link 23b. A link mechanism 23 composed of a link 23c whose other end is pivotally supported on the back surface of the seat 2 is attached.

  The link 23b is pivotally supported on the back surface of the seat 2 so that the link 23b is pivotally supported. A backrest angle detection sensor 24, which is a potentiometer, is attached to the pivoted portion so as to detect the amount of rotation of the link 23b. It has become. Reference numeral 25 denotes a handrail attached to the seat 2. Note that the backrest angle detection sensor 24 is not limited to a potentiometer, and may be any sensor that can detect the undulation angle of the backrest 3.

  The raising / lowering means of the backrest 3 configured as described above is for draining the oil of the backrest cylinder 21 when a command for lying down of the backrest 3 is input from the control means to the control circuit provided on the chair side. The solenoid valve is operated and the backrest 3 is prone. When the backrest 3 falls down, the connecting link 23b of the link mechanism 23 rotates and the connecting link 23b is detected by the backrest angle detection sensor 24, so that the amount of change from the backrest angle detection sensor 24 is sent to the control means. Is done. Therefore, the control means can grasp the amount of lying on the back by monitoring this amount of change.

  In addition, when a command for standing the backrest 3 is issued from the control means, a pump (not shown) is driven to supply oil into the backrest cylinder 21 to stand the backrest 3. With the backrest 3 standing up, the backrest angle detection sensor 24 is operated in the same manner as described above, and the amount of change is sent to the control means. In addition, although the cylinder was used as the raising / lowering means of the backrest 3, the motor can be used as a drive source.

  The back of the backrest 3 has a first cylinder 32 for moving the pillow 31 up and down, and a pillow 31 attached to the tip of the ram 32a of the cylinder 32 according to the treatment site (upper or lower teeth). A second cylinder 33 for moving in the direction is attached. The vertical movement member 34 that moves up and down by discharging and storing the ram 32a of the first cylinder 32 is located on the side of the guide rail 35 for preventing the backrest 3 from slipping back to the guide rail 35. It is guided by a fixed cover plate 35 so as to be movable up and down.

  A guide roller 34a for slidably supporting a curved pillow support plate 36 having a lower end connected to the ram 33a of the second cylinder 33 is attached to the upper end of the vertical movement member 34, and the pillow support plate A pillow 31 is fixed to the upper end of 36. A control plate 37 having a tapered surface 37a formed on a side surface is attached to the vertical movement member 34, and a rotating plate 38a having a roller that rotates in sliding contact with the tapered surface 37a of the control plate 37 is backrest 3. It is attached to the side for free rotation.

  The rotating plate 38a is attached to a rotating shaft of a pillow height detection sensor 38, which is a potentiometer fixed to the backrest 3 as well. Reference numeral 39 denotes a spring for lowering the rams 32a and 33a of the first and second cylinders 32 and 33. The pillow height detection sensor 38 is not limited to a potentiometer, and may be any sensor that can detect the height of the pillow 31.

  The vertically moving means of the pillow 31 configured in this way drives the pump (not shown) to supply oil to the second cylinder 32 when a command to raise the pillow 2 is input from the control means to the control circuit provided on the chair side. The vertical movement member 34 is raised by supplying the inside. When the vertical movement member 34 is raised, the control plate 37 is also raised, the taper surface 37a of the control plate 37 rotates the rotation plate 38a, and the amount of change from the pillow height detection sensor 38 is sent to the control means. Is done. Therefore, the control means can grasp the rising amount of the pillow 31 by monitoring the amount of change.

  When a lowering command for the pillow 31 is issued from the control means, the solenoid valve for draining the oil in the first cylinder 32 is operated and the pillow 31 is lowered. When the pillow 31 is lowered, the pillow height detection sensor 38 is operated in the same manner as described above, and the amount of change is sent to the control means. In addition, although it demonstrated using the cylinder as a raising / lowering means of the said pillow 31, it is also possible to carry out using a motor as a drive source.

  4 slides on a pre-tilt sag 41 pivotally supported in front of the seat plate 2 described in detail in FIG. 4 and a guide rail 41a attached to the pre-tilt sag 41 with respect to the pre-tilt sag 41. A front sag cylinder 26 is mounted between the pre-tilt sag 41 and the seat 2 to cause the pre-tilt sag 41 to move up and down. ing.

  Further, a sliding cylinder 43 is attached between the pre-tilt sag 41 and a shaft 42b fixed to the tip of the pre-tilt sag 42 to slide the pre-stretch sag 42 relative to the pre-tilt sag 41, and A spring 44 for contracting the ram 43a discharged from the sliding cylinder 43 is attached. Further, a control plate 45 having a tapered surface 45a formed on the side surface is attached to the expansion / contraction sag 42, and a rotation plate 46a having a roller that rotates in sliding contact with the taper surface 45a of the control plate 45 hangs before tilting. 41 is rotatably attached to the side of the guide rail 41a.

  The rotating plate 46a is attached to a rotating shaft of a front drooping protrusion detection sensor 46 which is a potentiometer fixed to the guide rail 41a. Although not shown, a link mechanism similar to the link mechanism 23 of the front sag 3 is attached between the seat 2 and the front sag 41 of the front sag 4, and the undulation angle of the front sag 4 is attached to this link mechanism. A front sagging angle detection sensor 47 (see FIG. 5) is attached. The front drooping protrusion amount detection sensor 46 and the front droop angle detection sensor 47 are not limited to potentiometers, but can detect the amount of protrusion of the expansion / contraction front droop 42 with respect to the pre-tilt droop 41 and can detect the amount of undulation of the front droop 4. Any sensor may be used.

  In the contraction means of the front sag 4 configured as described above, when an extension command of the front / rear sag 42 is input from the control means to the control circuit provided on the chair side, the pump is driven to drive oil to the front sag cylinder 26. While being supplied, it is supplied into the sliding cylinder 43 so that the pre-tilt sag 41 falls down, and the expansion / contraction sag 42 protrudes forward. When the expansion / contraction sag 42 protrudes, the control plate 45 also moves together, the taper surface 45a of the control plate 45 rotates the rotation plate 46a, and the amount of change from the front sag projection sensor 46 is sent to the control means. Is done. Therefore, the control means can grasp the amount of protrusion of the front sag 4 by monitoring the amount of change.

  When a command for raising the front sag 4 is issued from the control means, the solenoid valve for draining the oil in the cylinders 26 and 43 is operated to erect the pre-tilt sag 41 and move the pre-tilt sag 42 to the pre-tilt sag 41 side. . By the movement of the expansion / contraction front sag 42, the front sag protrusion amount detection sensor 46 is operated in the same manner as described above, and the change amount is sent to the control means. In addition, although the cylinder was used as the raising / lowering means of the pre-tilt sag 41 and the moving means of the pre-tilt sag 42, a motor may be used as a drive source.

Next, a control circuit for controlling the height of the chair and the extension of the front droop according to the outputs from the various sensors described above will be described with reference to FIG. In FIG. 5, the same sensors as those of the sensors are denoted by the same reference numerals, and the description thereof is omitted.
In the figure, reference numeral 5 denotes a gargle switch operated when the patient gargles, a preset switch for returning the patient to the supine position for treatment, a return switch for returning the patient from the supine position to the original sitting position, and one dental chair. When a plurality of dentists use it, the side of the chair and the doctor table are made up of a switch group including a changeover switch for selecting a seat height position suitable for the height of the dentist to be used. Is provided.

  6 is a control means for performing the operation described in the following flowchart, and determines the amount of vertical movement of the seat 2 and the amount of protrusion of the front and rear sag 42 of the front sag 4 with respect to the amount of elevation when the pillow 31 is moved up and down. The data is stored as a table or a memory in which an arithmetic expression is stored, and the value read from the data or the calculated result value coincides with the height of the seat 2 or the front droop 4 Calculations such as whether the protruding amounts of the two coincide are performed. Further, the pillow 31 is moved up and down by having a person of standard height sit down, and the pillow height that fits the head of the seated person and the pillow 31 is stored as a reference value in the memory. .

Next, in order for the patient of FIG. 6 to gargle, the seat is positioned so that the patient and the spitball b (see FIG. 8) of the cuspider device a fixed to the floor are aligned to facilitate gargle. The operation when the height adjustment of 2 is performed will be described.
First, the control means 6 monitors whether or not the gargle switch has been operated (step S11). If it is determined that the switch has been operated, the value from the pillow height detection sensor 38 at the position where the height of the pillow 31 is adjusted and fixed. , And the difference from the reference value is calculated and fetched (step S12), and the height correction value of the seat 2 with respect to the height position of the pillow 31 is read from the memory, or the correction value is obtained by performing the calculation. (Step S13).

  Here, it is determined whether the correction value is higher than a preset range (step S14), and if it is determined that the correction value is low as in the case of a short patient as shown in FIG. 12 is supplied with oil (step S15), and the seat height detection sensor 15 is constantly compared (step S16). When it is determined that the correction value is matched, the oil supply is stopped and the seat 2 is stopped. (Step S17).

  Next, when it is determined that the comparison is not low in the step S14, it is determined whether or not the correction value and the set value are the same (step S18). The operation ends without performing the up and down movement of 2, and if it is determined that the height is high as in the case of a tall patient as shown in FIG. 8 (b), the seat cylinder 12 should be drained. When the solenoid valve is opened and the oil in the cylinder 12 is discharged (step S19), the seat height detection sensor 15 is always compared (step S20), and when it is determined that the correction value matches, the solenoid valve is closed. The seat 2 is stopped (step S21).

  In addition, although the above-mentioned operation | movement description was demonstrated when the backrest 3 and the front sag 4 were in the standing state, it will be performed after performing the return operation | movement mentioned later from the preset state which is a medical treatment position.

  Next, in order to explain the transition operation from the sitting state to the medical state, if it is determined that the preset switch is operated after monitoring whether or not the preset switch has been operated, the height of the pillow 31 is not shown. From the memory, the amount of vertical movement of the seat portion 2 and the amount of protrusion of the front / rear sag 42 of the front sag 4 are read from the memory or calculated and stored as correction values. Then, oil is supplied to the cylinders 12 and 43 or the solenoid valve is opened so as to obtain this correction value, and control is performed while monitoring the values of the seat height detection sensor 15 and the forward drooping protrusion amount detection sensor 46. .

  Next, the operation | movement for projecting the expansion / contraction droop 42 of the front droop 4 with the flowchart of FIG. 7 is demonstrated. In addition, although the operation | movement which descends the seat part 2 is performed before the forward drooping protrusion operation | movement is performed, or this operation | movement is the same as the case of the said gargle operation | movement, description is abbreviate | omitted.

  When the preset switch is operated, the control means 6 monitors whether or not the current state of the backrest 3 has occurred based on the value of the backrest angle sensor 24 (step S31). Neither the prone position of 4 nor the protruding operation of the expansion / contraction sag 42 is performed (step S32). Next, it is monitored whether or not the oil in the backrest cylinder 21 falls within a range where the backrest 3 is laid down by 1/4 of the total undulation angle by opening the solenoid valve (step S33). When the value reaches the value detected by the backrest angle detection sensor 24, oil is supplied to the front sagging cylinder 26, and the value of the front sagging angle detection sensor 47 is displaced to 1/8 while monitoring the value. At this time, no oil is supplied to the front-sliding cylinder 43 (step S34).

  Further, the control means 6 monitors whether oil is supplied to the backrest cylinder 21 and the overturning angle is within a range of 2/4 (step S35), and determines that it has reached the range of 2/4. Then, oil is further supplied to the front drooping cylinder 26 to displace the front droop 4 in the prone direction up to 2/8. At this time, no oil is supplied to the front drooping slide cylinder 43 (step S36). This is because if the front drooping 42 is protruded before the front droop 4 falls down to a certain extent, the lower end of the front drooping 42 and the floor surface This is because there is a possibility of winning.

  Next, the control means 6 monitors whether or not the oil is supplied to the backrest cylinder 21 and the overturning angle is within the range of 3/4 (step S37), and determines that it has reached the range of 3/4. Then, oil is continuously supplied to the front drooping cylinder 26, and the front droop 4 is displaced in the prone direction until 3/8. In addition, oil is supplied to the front dripping / sliding cylinder 43 so that the expansion / contraction droop 42 protrudes by 1/4 (step S38).

  Here, as shown in FIG. 9 (a), the pillow 31 is raised in the case of a person whose height is high, and is lowered in the case of a low person. The amount of protrusion 42 is determined. Then, in the case where the patient is tall and the entire stretchable front sag 42 is protruded, the backrest 3 is laid down to the maximum sleeping angle (step S39). Further, the front droop 4 is laid down to 4/4 (maximum lying position), and the expansion / contraction front droop 42 is projected to 8/8 (maximum protruding position) (step S40), and the control means 6 sets the setting position to 4/4. If it is determined that the control has been reached, the control ends here (step S41), and the chair is placed in a medical posture.

  In the case of a patient whose height is short as shown in FIG. 9 (b), when the pillow 31 is pulled out only up to ¼, the front / back sag 42 is pulled out by ¼, and the pillow 31 is When only 2/4 is pulled out, the tip of the stretchable front droop 42 protrudes from the seated patient's foot by controlling that the stretchable front droop 42 is pulled out by 2/4. There is no longer any possibility of kicking off by the front-and-back elastic front sag 42.

  In order to return the chair in the gargle position or the chair in the medical position to the reference value, the control means 6 stores the value of each sensor in the reference value for each dentist by operating the return switch. Therefore, the control means 6 controls each cylinder so that each sensor has a stored value, so that it can be returned to the reference position for each dentist.

  Further, in the present embodiment, since the detection position for holding the stop position such as the potentiometer is used for the height position of the seat portion 2, the undulation position of the backrest 3 and the protruding position of the front sag 4, the current position is stored in the memory. Since it is not necessary to memorize, it is possible to use a memory having a small capacity, but it is naturally possible to use a memory that does not need to memorize the current position like other detection sensors.

It is the perspective view seen from the back side of the whole dental chair which shows one Example of the automatic height adjustment apparatus of the dental chair which concerns on this invention. It is a side view same as the above. It is a rear view of a backrest. It is a rear view of a front droop. It is a system block diagram which shows a control means. It is a flowchart which shows the operation | movement for adjusting the height of a chair to a gargling position. It is a flowchart which shows the operation | movement for adjusting to a medical treatment position. It is a figure for demonstrating the relationship between the patient in the Example of a gargling position, and a Spitton ball, (a) is a case with a short patient, (b) is a side view in the case of a high patient. It is a figure for demonstrating the relationship between the patient and dentist in the Example of a medical treatment position, (a) is a side view in the case of a tall patient, (b) is a case of a short patient.

Explanation of symbols

DESCRIPTION OF SYMBOLS 12 Seat part cylinder 15 Seat part height detection sensor 2 Seat part 21 Backrest cylinder 24 Backrest angle detection sensor 24 Front suspension cylinder 3 Backrest 32 Pillow cylinder 38 Pillow height detection sensor 4 Front suspension 43 Front suspension cylinder 46 Front drooping protrusion detection sensor 47 Front droop angle detection sensor 6 Control means

Claims (6)

By adjusting the height of the seat to a predetermined height according to the amount of displacement of the pillow that can be moved up and down with respect to the backrest, the gargle height of the patient sitting on the spitball and chair An automatic height adjustment device for a dental chair, characterized by matching. A dental chair comprising: a seat part that can move up and down; a backrest that can be raised and lowered relative to the seat part; and a pillow that is attached to the upper part of the backrest so as to move up and down. A seat height detection sensor for detecting the vertical movement amount of the pillow, a pillow height detection sensor for detecting the vertical movement amount of the pillow, and a displacement detected by the pillow height detection sensor by moving the pillow up and down When the seat height detection sensor detects a predetermined height value, the control means stops the vertical movement of the seat, and the position at which the seat is stopped by the control means gargles the patient. An automatic height adjustment device for a dental chair, characterized in that the height position of the spit-on balls for performing the adjustment is matched. A dental chair comprising: a seat part that can move up and down; a backrest that can be raised and lowered relative to the seat part; and a pillow that is attached to the upper part of the backrest so as to move up and down. A seat height detection sensor for detecting the vertical movement amount of the head portion, a backrest angle detection sensor for detecting the sleeping angle of the backrest, a pillow height detection sensor for detecting the vertical movement amount of the pillow, and moving the pillow up and down The seat height detection sensor has a predetermined height value according to the amount of displacement detected by the pillow height detection sensor and the amount of bedrest of the backrest angle detection sensor. And a control means for stopping the vertical movement of the seat so that the position at which the seat is stopped by the control means matches the treatment height of the dentist and the height of the treatment site of the patient. An automatic height adjustment device for a dental chair, wherein The automatic height adjusting device for a dental chair according to claim 3 or 3, wherein the value of the predetermined height amount by the control means can be changed according to the height of a dentist or the like. The value of the predetermined height by the control means is a pillow height sensor that detects the pillow height by storing a value obtained from an experiment in advance as a height value of the seat in the memory. The automatic height of the dental chair according to claim 2 or 3, wherein the height of the seat is adjusted by determining the value stored in the memory corresponding to the value of Adjustment device. The said pillow height detection sensor hold | maintains the value from the preset reference position, The control means controls the raising / lowering of the seat part with respect to this hold | maintained value, The control means characterized by the above-mentioned. An automatic height adjustment device for a dental chair as described in 1.

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