JP2006122385A - Automatic apron projection quantity adjusting device of dental chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems of a conventional dental chair whose apron can be extended when the apron is horizontally laid down, wherein the adjustment of the degree of extension according to the height of a patient by a dentist or an assistant is complicated and wherein it takes time for the adjustment though various problems can be solved by changing the degree of extension according to the height of the patient. <P>SOLUTION: The subject automatic apron extension quantity adjusting device of the dental chair makes the length of the apron 4 correspond to the length of the legs of the patient in the supine posture by adjusting the quantity of extension of the apron 4 to a prescribed quantity according to the quantity of displacement of a pillow 31 which is attached to a backrest 3 of the dental chair in such a way as movable in the vertical direction of the backrest 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In accordance with the height of a patient sitting on a dental chair (hereinafter simply referred to as “chair”), the present invention provides a foot from the tip of the front sag that protrudes from the base sag even when the patient is in a supine state for a therapeutic posture. The present invention relates to a device for adjusting the amount of protrusion of an automatic front sag of a dental chair so that the tip does not protrude.

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-mentioned conventional example, what adjusts the height of a chair while seeing the value of a scale or a display part is disclosed. In addition, there is disclosed a front droop that puts the tip of the patient's thigh so that a comfortable posture can be taken at the time of treatment, but such a front droop is in a horizontal state during the treatment state, and in the normal state, the patient can easily sit down. It becomes perpendicular to it. And, when the front sag becomes horizontal, there is a problem that the foot tip protrudes from the front sag in the case of a patient with a large height, and the slippers worn in the case of a patient with a short height become an obstacle. .

  Therefore, in recent years, there has been developed a structure in which the front end side of the front sag extends when the front sag is leveled (downturned). Therefore, in such a sag, the above-mentioned problem can be solved by changing the extension degree according to the extension of the patient. However, in the case where the sag can be extended, a dentist or Since the assistant adjusts the degree of extension according to the extension of the patient, there is a problem that the operation is troublesome and takes time to adjust.

  The present invention is intended to solve the above-described problems, and the object of the present invention is to automatically adjust the amount of extension of the front sag according to the amount of vertical movement of the pillow that moves up and down according to the height of the patient. Therefore, there is no need for adjustment by a dentist or assistant, and the extension of the front sag is performed after the sag of the front sag exceeds a predetermined value, thus preventing the lower end of the front sag from coming into contact with the floor surface. The purpose is to provide a device for adjusting the amount of protrusion of an automatic front sag of a dental chair.

  The automatic front hanging / extending / contracting amount 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 the pillow mounted so as to be movable up and down with respect to the backrest. Thus, by adjusting the extension amount of the anterior sag to a predetermined extension amount, the foot length of the patient in the supine posture and the length of the anterior sag are matched.

  The means of claim 2 comprises: a seat part that can be moved up and down; a backrest that can be raised and lowered relative to the seat part; a pillow that is attached to the upper part of the backrest so as to be movable up and down; and the seat part In a dental chair composed of a front sag that is attached so as to be able to lie down, a pillow height detection sensor that detects the amount of movement of the pillow up and down relative to the backrest and attached to the seat side A front drooping expansion / contraction amount detection sensor configured to be able to extend / contract with respect to the pre-tilt sagging, and a displacement amount detected by the pillow height detection sensor by moving the pillow up and down. When the pre-movement sag detection sensor detects a predetermined expansion / contraction amount value, the control unit stops the expansion / contraction of the pre-movement sag, and the control unit adjusts the expansion / contraction amount of the sag before movement by an amount corresponding to the height of the patient. It is characterized by.

  The means of claim 3 includes a seat part that can be moved up and down, a backrest that is attached to the seat part so as to be raised and lowered, a pillow that is attached to the upper part of the backrest so as to be movable up and down, and the seat part. In a dental chair composed of a front sag that is attached so as to be able to lie down, a pillow height detection sensor that detects the amount of movement of the pillow up and down relative to the backrest and attached to the seat side A front and rear extension / contraction amount detection sensor configured to detect the amount of expansion / contraction of the pre-moving sag configured to be extendable / contractable with respect to the pre-tilt sag, a front sag angle detection sensor that detects the amount of undulation of the pre-tilt sag, and a vertical movement of the pillow. In accordance with the amount of displacement detected by the pillow height detection sensor, the front sag angle detection sensor lies down before tilting until the predetermined sag amount is reached, and the pre-tilt sag falls to a predetermined level. After the value is detected by the sag sensor, the movement It is composed of control means for starting the expansion and contraction of the sag and expanding and contracting the sag before moving until the value of the predetermined expansion and contraction amount is reached, and the expansion and contraction of the sag before expansion and contraction is performed in conjunction with the lying down of the backrest by the control means. The lower end of the sag before moving and the floor surface are not in contact with each other.

  The means of claim 4 comprises a seat part that can be moved up and down, a backrest that is attached to the seat part so as to be raised and lowered, a pillow that is attached to the upper part of the backrest so as to be movable up and down, and the seat part. In a dental chair configured to be able to lie down with respect to the backrest, a pillow height detection sensor for detecting the amount of movement of the pillow up and down relative to the backrest, and the amount of undulation of the backrest A backrest angle detection sensor that detects the amount of expansion and contraction of the front sag and the amount of sag before and after the tilt. The front sagging angle detection sensor for detecting the tilt and the tilt before tilting until the front sagging angle detection sensor reaches a predetermined amount of prone position according to the amount of displacement detected by the pillow height detection sensor by moving the pillow up and down. And the drooping detection sensor before Control means for expanding and contracting the pre-movement sag after the angle detection sensor detects a value at which the backrest has become a predetermined prone amount, It is configured, and the lower end of the sag before moving and the floor surface are not in contact with each other by the expansion and contraction of the sag before and after being extended by the control means in conjunction with the lying down of the backrest.

  In the present invention, as described above, by moving the pillow up and down according to the height of the patient, the sag is automatically extended according to the height of the patient in the supine posture. In addition, the toes of a patient with a high height do not protrude from the ankle and the slippers worn by a patient with a short height are not repelled when stretched.

  In addition, since the front sag does not extend until the front sag falls down to the predetermined sleeping angle, the front sag tip does not touch the floor surface and damage or shock does not surprise the patient. .

  In addition, the prone position of the prone position is linked to the prone position of the prone position, so that the transition to the patient's supine position is performed smoothly and a stable supine position is obtained, and the prone position of the prone position is determined by the predetermined sleeping angle. Since the front sag is not extended until the sag is reached, the front sag tip is brought into contact with the floor surface and is damaged, or an impact is generated and the patient is not surprised.

  The present invention adjusts the extension amount of the front sag to a predetermined extension amount in accordance with the displacement amount 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 (4)

By adjusting the amount of extension of the front sag to a predetermined extension according to the amount of displacement of the pillow that can be moved up and down with respect to the backrest, the leg length of the patient in the supine posture and the length of the front sag are matched. A device for automatically extending and retracting a dental chair according to claim 1 characterized in that A seat that can move up and down, a backrest that can be raised and lowered relative to the seat, a pillow that can be moved up and down on the top of the backrest, and a seat that can be laid down against the seat In a dental chair composed of an attached front sag, a pillow height detection sensor that detects the amount of movement of the pillow up and down relative to the backrest, and a pre-tilt sag attached to the seat side A sag sensor for detecting the amount of sag before and after movement that is configured to be extendable and a sag sensor before movement according to the amount of displacement detected by the pillow height detection sensor by moving the pillow up and down. A dental chair comprising: control means for stopping expansion / contraction of the sag before movement when detecting a value of expansion / contraction amount, and adjusting the expansion / contraction amount of the sag before movement by the control means according to the height of the patient. Automatic front sag expansion / contraction adjustment device. A seat that can move up and down, a backrest that can be raised and lowered relative to the seat, a pillow that can be moved up and down on the top of the backrest, and a seat that can be laid down against the seat In a dental chair composed of an attached front sag, a pillow height detection sensor that detects the amount of movement of the pillow up and down relative to the backrest, and a pre-tilt sag attached to the seat side A front and rear extension / contraction amount detection sensor that detects the amount of expansion / contraction of the forward sag configured to extend and contract, a front sag angle detection sensor that detects the amount of undulation before tilting, and a pillow height detection sensor that moves the pillow up and down. Depending on the detected amount of displacement, the forward sag detection sensor depresses the pre-tilt sag until the pre-tilt angle detection sensor reaches a predetermined sag amount value, and the front sag angle detection sensor indicates the value at which the pre-tilt sag has a predetermined sagging amount. After detection, the expansion and contraction of the sag before moving starts And a control means for expanding and contracting the sag before moving until a predetermined amount of expansion and contraction is reached, and the control means performs the expansion and contraction of the sag before and after the expansion of the sag on the backrest by the control means. A device for automatically extending or contracting an anterior sag of a dental chair, characterized in that it does not come into contact with the floor surface. A seat that can move up and down, a backrest that can be raised and lowered relative to the seat, a pillow that can be moved up and down on the top of the backrest, and a seat that can be laid down against the seat In a dental chair composed of an attached front sag, a pillow height detection sensor that detects the amount of movement of the pillow up and down relative to the backrest, and a backrest angle detection that detects the amount of undulation of the backrest A sensor, a fore-and-aft expansion / contraction detection sensor for detecting an expansion / contraction amount of the pre-movement sag that is configured to be extendable / contractable with respect to the pre-tilt sag attached to the seat portion side, and a front-sag angle detection sensor for detecting the undulation of the pre-tilt sag The pillow is moved up and down, and depending on the amount of displacement detected by the pillow height detection sensor, the front sag angle detection sensor lies down before tilting until it reaches a predetermined value, and the movement The sag detection sensor has a predetermined expansion / contraction value. And a control means for expanding and contracting the sag before moving, after the angle detection sensor detects a value at which the backrest becomes a predetermined prone amount. The automatic front sag expansion / contraction adjustment device for a dental chair, wherein the lower end of the front sag and the floor surface do not come into contact with each other by extending and contracting the front sag in conjunction with the overturning of the backrest. .

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