JP2009006023A - Chair for medical use - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a chair for medical use, capable of allowing a patient to be easily seated, regardless of a physique, to move to a treatment without causing neither back abrasion nor fear in the action of the chair, and to sufficiently raise up to a height suitable for the treatment. <P>SOLUTION: The chair for medical use includes: a seat part base 7 having seat pivotal support parts 9b arranged close to the great trochanters of a seated person; back rest links 9 to which a back rest 5 is attached and which pivotally support a seat part board by the seat pivotal support parts; an elevating base 3 for freely rotatably supporting the back rest link by a back rest pivotal support part 3a which is formed at a position separated backward from the seat part board and also a position higher than the upper horizontal surface of a seat part 7a on the seat base in a chair state; a seat part link 8 where one end 8a is pivotally supported by the elevating base and the other end 8b is pivotally supported by the seat part base; a base seat 1; a straight-elevating guide 4 for performing guide so as to move the elevating base in a vertical direction; a rising/falling actuator 6 pivotally supported by a cylinder pivotal support part 3b; and an elevating actuator 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a medical chair that can be used in a dental clinic, an ophthalmic clinic, or the like to change a sitting posture and a legrest to a horizontal state during treatment so that a patient in a sitting posture can be transferred to a posture suitable for treatment. About.

  As a conventional medical chair, for example, there is a technique disclosed in Japanese Patent Laid-Open No. 10-127400. In this technology, when a patient sits on a chair, the backrest stands upright with respect to a seat that can be moved up and down with respect to a pedestal installed on the floor, and the legrest is suspended from the seat. In this state, a patient and a doctor in a sitting position consult with each other, and at the time of treatment, first raise the seat with respect to the pedestal, and then seat the patient with the backrest and legrest displaced horizontally. The posture was changed to a supine posture suitable for treatment. In order to allow the patient to receive treatment in a comfortable posture, the seat portion is raised higher as the back leans backward, as in the above technique and the technique disclosed in Japanese Utility Model Laid-Open No. 59-69729. Some have a mechanism for tilting.

By the way, in such a medical chair, the patient is seated with the seat portion lowered to the minimum height position so that the user can sit comfortably. When the backrest is tilted backward at that height and displaced horizontally, the upper end of the backrest hits the doctor's knee sitting on the treatment chair, or the position of the patient's mouth or eyes is Because it is too low, first, the seat is raised, then the backrest is displaced to a horizontal state, and then the height of the seat is finely adjusted as necessary to facilitate treatment by the doctor. It was necessary. The idea of Japanese Utility Model Publication No. 59-69729 does not disclose raising or lowering the seat.
JP-A-10-127400 Japanese Utility Model Publication No. 59-69729

  In the above-described conventional example described in the background art described above, the operation until the above-described treatment is started is troublesome, and it takes time, so that the time until the start of the treatment becomes long. If the backrest was tilted backwards at the lowest position, the backrest could hit the doctor's knees and was dangerous.

  Furthermore, since there is a limit to the amount by which the seat can be raised, it has not been possible to sufficiently raise it to a height suitable for a doctor to perform examinations and treatments in a standing position.

  In addition, the backrest is centered on the rotation fulcrum provided on the upper side of the seat, and the range of undulations is wide so that backlash does not occur between the patient's back and backrest when the backrest tilts backward The hydraulic cylinder for back and forth requires a long stroke and is installed in a substantially horizontal direction on the back surface of the seat portion, so that the depth of the seat portion increases. As a result, when a small patient sits with the back of the knee in line with the front edge of the seat, the position and movement of the pillow and backrest do not match the patient, causing discomfort, or part of the link mechanism There was a problem of being exposed to the outside.

  In addition, the patient's head position changes greatly as the backrest angle is adjusted, so the patient feels fear and discomfort, and the doctor changes the position of the eyes and mouth of the patient. At the same time, the height of the chair on which he sits, the lighting, and the position of the treatment device had to be greatly revised.

  Also, the conventional mechanism for tilting the seat as the backrest tilts backward is manufactured because the structure is complex and the number of parts and assembly processes are increased, as in the technique disclosed in Japanese Utility Model Publication No. 59-69729. Cost increases. Also, when the back of the cylinder is retracted and the backrest tilts, the cylinder is retracted and the front part of the seat is lifted up. If there is no strong force, the backrest will not tilt backwards, so it is necessary to use a high-priced double-acting hydraulic cylinder, or if it is a single-acting hydraulic cylinder, a strong tension spring will be used together Therefore, there was a problem that the structure would become large.

  The present invention is intended to solve the above-mentioned problems, and the purpose of the present invention is to make it easy for a patient of any physique to be seated and to easily treat without causing backlash or fear by the subsequent movement of the chair. Therefore, it is an object of the present invention to provide a medical chair that can be shifted to a state suitable for treatment and can be sufficiently raised to a height suitable for treatment at low cost.

  The medical chair according to the present invention achieves the above-described object, and the means of claim 1 includes a seat base 7 provided with a seat shaft support 9b near the greater trochanter of the seated person, and a backrest. 5 and a backrest link 9 that pivotally supports the seat base plate with the seat pivot support, a position away from the rear of the seat base plate, and on the seat base in the chair state A lift base 3 that rotatably supports a backrest link by a backrest support 3a formed at a position higher than the horizontal surface of the upper surface of the seat 7a, and one end 8a that is supported by the lift base and the other end 8b A seat link 8 pivotally supported by the seat base, a base 1 installed on the floor, one end attached to the base, the other end attached to the lift base, and the lift base vertically The upper guide 4 that guides to operate, one end pivotally supporting the back surface of the seat base, and the other end to the lifting base And a hoisting actuator 6 pivotally supported by the cylinder shaft support 3b and an elevating actuator 2 having one end attached to the base and the other end attached to the elevating base, and extending the hoisting actuator. Thus, the seat base is tilted so that the front is raised while rising, and the backrest tilts backward with the backrest shaft support portion as a rotation fulcrum due to the displacement of the seat base.

  According to a second aspect of the present invention, a seat base 7 having a seat shaft support 9b provided near the greater trochanter of the seated person and a backrest 5 are attached, and the seat base is pivoted by the seat support shaft. The backrest link 9 to be supported, and the backrest shaft support portion 3a formed at a position separated from the rear of the seat base and at a position higher than the upper horizontal surface of the seat portion 7a on the seat base in the chair state. The base 3 that supports the backrest link rotatably, the seat link 8 with one end 8a pivotally supported by the base and the other end 8b pivotally supported by the seat base, and a floor surface. A pedestal 1 to which the base is attached, and a hoisting actuator 6 whose one end is pivotally supported by the back surface of the seat base and the other end is pivotally supported by a cylinder pivot portion 3b provided on the base or pedestal. By constructing and extending the hoisting actuator, the seat base rises and the front becomes higher The inclination, and wherein the backrest by the seat base of the displacement is tilted backward the backrest pivot portion as the rotation fulcrum.

  According to a third aspect of the present invention, in the first aspect, the elevating actuator, the hoisting actuator, and the upper guide are arranged on the same plane, and the hoisting actuator is pivotally supported while being sandwiched from the left and right directions of the elevating board. In addition, the tip of the hoisting actuator is connected to the seat substrate so that the posture is substantially vertical.

  According to a fourth aspect of the present invention, in the above-described first or second aspect, the backrest is rotatably supported by a backrest shaft 9d on an extension piece extended from an upper end portion of the backrest link. A spring 9f is built in the backrest in a direction orthogonal to the axial direction of the backrest shaft, and the backrest is spring-biased in a prone direction and is normally fixed in contact with the extension piece. And

  According to a fifth aspect of the present invention, in the above-described first or second aspect, the backrest link has a curved portion with an arcuate side surface, and standing pieces having shaft holes on the left and right sides of the lower end of the curved portion are formed. A shaft hole penetrating in the left-right direction and a flat surface for fixing the backrest are formed, and an arc-shaped pinching prevention cover formed so that the seat shaft support portion is the center of the arc is integrally attached to the backrest link. It is characterized by.

  According to a sixth aspect of the present invention, in the first or second aspect, the legrest 10 is pivotally supported forward of the seat base, and one end is pivotally supported on the legrest and the other end is the seat portion. A legrest link 11 pivotally supported by the link is provided, and the legrest is displaced in a horizontal state by the legrest link as the seat base rises.

  According to a seventh aspect of the present invention, in the above-described sixth aspect, the length of the leg rest link is set such that the tip of the leg rest enters inward from the vertical state when the leg rest is displaced in the vertical direction. Features.

  According to Claims 1 and 2 of the present invention, by extending the hoisting actuator, the seat base is raised while the backrest is separated from the rear of the seat base provided in the backrest. The backrest pivots around the backrest that is higher than the top horizontal surface of the center of the body, so that the patient's eyes and mouth can be positioned just by tilting the backrest without raising the seat in advance as in the past. For doctors seated in treatment chairs, the height is reasonable, easy to operate, and shortens the time to treatment. Further, the upper end of the backrest does not hit the doctor's knee when the backrest is tilted backward.

  In addition, since the amount of rocking of the seated person's head that accompanies back tilt is small, the displacement of the patient's semicircular canal is small, causing no fear or discomfort. When the patient's opening direction is changed by adjusting the position of the patient, fluctuations in the position of the mouth can be suppressed, and the height, illumination, and position of the treatment instrument of the doctor can be reduced and workability can be improved.

  In addition, the three operations of raising the seat base, tilting the seat base, and back tilting the back base are the fixed base, the seat base is the input node, the seat link is the intermediate node, and the back link. Because it is realized by a set of four-bar links with an output node, the number of parts and the assembly process are small, the manufacturing cost is low, and the driving force is the force that the undulating actuator extends, so that Even if it exists, it can be operated reliably.

  Furthermore, according to the first aspect of the present invention, the seat can be lifted simultaneously with the back leaning of the backrest, and can be lifted by the lifting / lowering actuator from that position as a starting point. The initial position of the seat can be lowered while having the above-mentioned height of the seat, so that even a child or an elderly person can easily get on and off the chair and it is suitable for doctors to perform examinations and treatments. It can be sufficiently raised and can be applied to a technique such as standing medical treatment.

  According to the second aspect of the present invention, since the elevating actuator and the direct upper guide are not used, the size is reduced, and at the same time, the number of parts and the assembly process are greatly reduced, and the manufacturing cost is reduced.

  According to the third aspect of the present invention, the lifting actuator, the hoisting actuator, and the upper guide are arranged on the same plane, and the hoisting actuator is pivotally supported while being sandwiched from the left and right directions of the lifting base, and the posture is substantially vertical. Since the tip of the lifting cylinder is connected to the seat base so that the seat can be reduced, the seat depth can be reduced and the patient can sit down even if it is small, so the position and movement of the backrest fit, The link mechanism is not exposed to the outside.

  According to the fourth aspect of the present invention, when an external force in the standing direction acts on the backrest while the backrest is tilted backward, the backrest is rotated in the standing direction. Even if the backrest is high, it is safe without the legs being pinched between the backrest and the floor and receiving abnormal pressure.

  According to the fifth aspect, since the operating range of the upright piece of the backrest link is minimized at a position higher than the horizontal surface of the upper surface of the seat portion, both sides of the thigh of the seated person are not damaged. In addition, there is a cover that always holds a certain distance from the seat back regardless of the back tilt position of the backrest between the backrest and the seat, so fingers are sandwiched between the backrest and the seat It is safe without being.

  In claim 6, since the legrest can be displaced horizontally as the seat base rises by adding the legrest link, the patient can receive treatment in an easy posture, and In claim 7, since the legrest is inserted inward from the vertical state in the chair state, the patient can put his / her leg under the seating portion when taking off and sitting, and can easily stand up and sit down. In addition, since the length of the legrest can be increased by the amount of being inward from the vertical state, the leg of the tall patient can be sufficiently supported. And even if the legrest has such a length that it abuts on the floor if the rotation fulcrum rotates without moving, the legrest gradually moves from the start of the operation in the operation toward the horizontal state according to the present invention. Since the distance between the rotation fulcrum of the legrest provided on the floor and the floor surface is increased, the effect that the legrest does not interfere with the floor surface can be obtained.

  In the present invention, the seat is lifted while being tilted so that the front side is raised, and the backrest is tilted backward about a rotation fulcrum provided near the backrest lumbar support. It is realized by a set of four-bar links with the base as the input node, the seat link as the intermediate node, and the backrest link as the output node, and its driving force is the force that the undulating actuator in the vertical direction extends.

Hereinafter, an embodiment of a medical chair according to the present invention will be described with reference to FIGS.
Reference numeral 1 denotes a pedestal fixed to the floor of a dental clinic or otolaryngology clinic, 2 denotes a lifting actuator such as a hydraulic cylinder mounted on the pedestal 1 on the cylinder 2a side, and the upper end of the piston 2b is a lifting base 3 Installed on. Reference numeral 4 denotes a well-known straight upper guide composed of a cylindrical portion 4a attached to the pedestal 1 and guided by rollers 4b arranged in four directions with respect to the cylindrical portion 4a and including a quadrangular column 4c which moves vertically. The upper end of the quadrangular column 4 c is attached to the elevating base 3.

  The elevating base 3 is formed in a U-shaped cross section, and one end is a backrest shaft support portion 3a that supports the lower portion of the backrest 5 upward, and the other end has a crank shape downward. The cylinder shaft support portion 3b is formed. 6 is a hoisting actuator such as a hydraulic cylinder in which a substantially intermediate portion of the cylinder 6a is rotatably supported in the cylinder shaft portion 3b in a state of being sandwiched from the left-right direction of the elevating base 3. The upper end is pivotally supported by the seat base 7. The raising / lowering actuator 2, the upper guide 4 and the raising / lowering actuator 6 are arranged on the same plane.

  The seat base 7 is formed in a U-shaped cross section. A seat 7a made of a cushion material is attached to the upper surface, and a hanging piece 7b extending downward from the back surface side. A pair of upright pieces 7 c is formed on the rear side of the seat base 7. 8 has one end 8a pivotally supported at the substantially middle portion of the lifting base 3, and the other end 8b pivotally supports the lower end of the hanging piece 7b of the seat base 7, and 9 has an arcuate side surface. An upright piece having a curved portion and having a shaft hole at the left and right of the lower end of the curved portion and a shaft hole penetrating in the left and right direction and a flat surface for fixing the backrest are formed at the upper end of the curved portion. The upper end portion 9a is pivotally supported by the backrest shaft support portion 3a of the elevating base 3, the upright piece 9b is pivotally supported at the tip of the upright piece 7c of the seat base 7, and the lower end portion 9c has one end. The other end of the leg rest link 11 pivotally supported on the back side of the leg rest 10 is pivotally supported.

  A backrest is attached to the backrest link by a backrest base (not shown), and an arc-shaped pinching prevention cover 13 formed so that the seat shaft support portion is the center of the arc is integrally attached. Yes. The anti-pinch sheet 13 is made of a flexible material such as a synthetic resin film, and there is a gap between the back of the seat 7a and the lower part of the backrest 5. Therefore, when the backrest 5 is raised and lowered, Is for preventing a hand from being pinched when inserted into the gap.

  Next, operation will be described based on the above-described configuration. FIG. 1 shows a state where a patient is seated on a chair. In this state, the front end side of the legrest 10 enters the inner side from the front end surface of the seat portion 7a so that the patient can easily stand up when leaving the chair. By doing so, the patient's heel enters the inside of the knee, so that the weight can be smoothly transferred, and even a person without muscle strength such as an elderly person can stand up without the assistance of a doctor or an assistant.

  In order to allow the front end of the leg rest 10 to enter the inner side from the front end surface of the seat 7a in this way, the angle at which the leg rest 10 can support the patient's foot in a comfortable state during the treatment shown in FIG. And the length of the leg rest link 11 is set so that the tip of the leg rest 10 enters the inside in the initial state at the time of patient introduction or withdrawal shown in FIG. It becomes possible.

  In order to shift to the treatment posture in the initial state described above, when a foot switch provided on the pedestal 1 or a button-like switch provided on the doctor table (none of which are shown) is operated, Oil is supplied and the piston 6b starts to rise. The seat base 7 is pushed up by the ascent of the piston 6b. The seat base 7 is connected to the elevating base 3 at one end by a backrest link 9 and at the other end by a seat link 8, and the seat link 8 Since the shaft support portions of the two ends 8a and 8b of the two and the shaft support portions of the two end portions 9a and 9b of the backrest link 9 are not parallel or have different distances, the seat base 7 is inclined as it rises.

  When the cylinder 6b is raised, the backrest link 9 in which the upright piece 9b is pivotally supported on the upright piece 7c of the seat base 7 has an upper end portion 9a that is pivotally supported on the backrest shaft support portion 3a of the elevating base 3. Therefore, the backrest shaft support portion 3a is rotated clockwise about the fulcrum. Since the backrest base (not shown) of the backrest 5 is fixed to the upper end portion 9a of the backrest link 9, the backrest 5 is attached to the shaft support portion 3a as the backrest link 9 rotates in the clockwise direction. The shaft is pivoted in the lying down direction (clockwise in FIGS. 2 to 4) using the rotation fulcrum as a rotation fulcrum.

  When the backrest link 9 is rotated in the clockwise direction, the legrest link 11 connected to the lower end portion 9c of the backrest link 9 moves leftward in FIGS. The legrest 10 pivotally supported in front of the seat base 7 is rotated in the horizontal direction to lift the patient's calf shin.

  As described above, as the amount of extension of the piston 6b in the hoisting actuator 6 increases, the seat portion 7a rises while tilting backward, and the backrest 5 overturns around the backrest lumbar support, The legrest 10 is displaced in the horizontal direction and finally stops at the position shown in FIG. In this position, the seat 7a, the backrest 5 and the legrest 10 are substantially bed-shaped and the seat is raised, so that the backrest is like a conventional medical chair shown in FIG. 5 of the headrest 12 does not hit the knee of the doctor sitting on the treatment chair.

  Further, since the undulating actuator 6 is maintained in a substantially vertical state and the piston 6b is moved up and down, unlike the conventional medical chair shown in FIG. 9, it is possible to reduce the depth of the seat portion without requiring a capacity in the front-rear direction. The chair can be downsized, and even a small patient can easily sit down. Further, in the movement in which the legrest 10 is displaced in the horizontal direction in conjunction with the backward tilting of the backrest 5, since the distance between the legrest rotation fulcrum and the floor surface gradually increases from the start of the movement, Even if the legrest 10 has a length that can sufficiently support the legrest 10, even if the legrest 10 is returned to the suspended state (chair state), the tip of the legrest 10 does not hit the floor surface. There is no need to raise the chair in advance to avoid contact with the surface.

  In the present invention, when the doctor is tall, the elevating actuator 4 is driven by operating a switch provided separately from the above-described switch, so that the height of the seat 7a and the backrest 5 are increased. By raising the legrest 10 without changing the angle, the legrest 10 can be moved to a height position where it can be easily treated by a doctor. Further, as shown in FIG. 5, it is possible to perform treatment in a standing position by further raising the piston 4 c of the lifting / lowering actuator 4.

  Furthermore, since the rotation fulcrum of the backrest 5 is in the vicinity of the lumbar support in the backrest, the patient's eyes and mouth become the height of the treatment position by the doctor just by tilting the backrest 5, so that the operation is easy and time-consuming It can be shortened, and the displacement of the semicircular canal at the back of the ear is reduced because the head movement distance of the patient is suppressed, so there is no fear or discomfort to the patient.

  In the embodiment described above, the seat base rises simultaneously with the lying down of the backrest 5, so that the upper end of the backrest 5 abuts on the doctor's knee when the backrest 5 is completely overturned. However, there is a possibility that the treatment chair where the doctor sits tall is also in contact with the knee when the seat height is high. Therefore, it is desirable that when the backrest 5 is in contact with the doctor's knee when lying down, the impact force on the knee is alleviated so as not to hurt the doctor. Hereinafter, an embodiment for reducing the impact force even when the doctor's knee is in contact with the upper end of the backrest 5 will be described with reference to FIGS. In this embodiment, the same reference numerals as those in the above-described embodiment denote the same members, and the description thereof will be omitted.

  In this embodiment, the upper end portion 9a of the backrest link 9 is extended, and the extension piece 9a is pivotally supported by a shaft 9d with respect to a backrest base (not shown) of the backrest 5. Furthermore, the extension piece 9a and a slidable spring attachment body 9e are attached to the backrest base in a direction orthogonal to the axial length direction of the shaft 9d, and the back piece is attached between the spring attachment body 9e and the extension piece 9a. A spring 9f that is spring-biased in a direction in which the bow 5 is brought into contact with the extension piece is mounted.

  By constructing the backrest 5 in this way, the backrest 5 is overturned with the shaft support portion 3a as a rotation fulcrum when lying down, but when the upper end of the backrest 5 comes into contact with the knee part of the doctor during the overturning Since the backrest 5 is rotated counterclockwise about the shaft 9d as a fulcrum against the spring force of the spring 9f, a strong impact is not applied to the doctor's knee. Since the doctor's knee part abuts and the spring 9f contracts, the contraction of the spring 9f and the displacement of the spring mounting body 9e are detected and the operation of the hoisting actuator 6 is stopped. It is also possible to reduce the impact of the part.

  Further, in the present invention, since the position of the eyes and mouth of the patient is just enough for the doctor sitting on the treatment chair simply by tilting the backrest, as shown in FIG. By removing the upper guide and the lifting actuator for moving up and down, the value can be increased in terms of cost and design.

  In FIG. 8, the same reference numerals as those of the above-described embodiment are shown by the same members. In this embodiment, since there is no guide directly above and an actuator for raising and lowering, the raising and lowering actuator 6 is rotatably attached to the fixed base 3 'fixed to the floor instead of the raising and lowering base, and the seat link 8 is pivoted. It has a supported structure. Even in this embodiment, the backrest 5 can be raised and lowered in the same manner as the above-described embodiment.

  In this figure, the legrest is omitted, but the backrest 5 is supported by pivotally supporting the seat base 7 in front of the seat base 7 and connecting one end of the legrest link 11 to the lower end portion 9c of the backrest link 9. The legrest can also be overturned in conjunction with the overturn of.

It is a side view which shows the initial state of the medical chair which concerns on this invention. It is a side view which shows the state slightly displaced in the overturning direction from the initial state same as the above. It is a side view which shows the state which displaced further in the prone direction from the state of FIG. It is a side view of the state where it fell down to the treatment position. It is a side view which shows the standing medical treatment state which raised the whole chair from the state of FIG. It is a side view of the medical treatment state which shows another Example. FIG. 7 is a side view in which a part of FIG. 6 is enlarged. It is a perspective view which shows the other Example which does not have a direct top guide and the actuator for raising / lowering. It is the side view which showed the state shown in FIG. 4 lying down to the treatment position with the conventional product.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Lifting actuator 3 Lifting base 4 Direct guide 5 Backrest 6 Lifting actuator 7 Seat base 8 Seat link 9 Backrest link 10 Legrest 11 Legrest link 12 Pillow 13 Clamp prevention cover

Claims (7)

A seat base with a seat pivot support near the greater trochanter of the seated person,
A backrest link to which a backrest is attached, and which supports the seat base board with the seat support section;
The backrest link is rotatably supported by a backrest shaft supporting portion formed at a position away from the rear of the seat base plate and at a position higher than the upper horizontal surface of the seat on the seat base in the chair state. Elevating base,
A seat link in which one end is pivotally supported by the lifting platform and the other end is pivotally supported by the seat base;
A pedestal installed on the floor,
An upper guide that has one end attached to the pedestal and the other end attached to the elevating base and guides the elevating base to operate in a vertical direction;
An undulation actuator having one end pivotally supported by the back surface of the seat base and the other end pivotally supported by a cylinder shaft support portion of the lift base;
One end is attached to the pedestal and the other end is composed of an elevator actuator attached to the elevator base,
By extending the hoisting actuator, the seat base is tilted so that the front rises while the seat base is raised, and the backrest tilts backward with the backrest shaft support as a rotation fulcrum due to the displacement of the seat base. A characteristic medical chair. A seat base with a seat pivot support near the greater trochanter of the seated person,
A backrest to which a backrest is attached and which supports the seat base with the seat pivot support,
A backrest link is pivotally supported by a backrest shaft supporting portion formed at a position away from the rear of the seat base and at a position higher than the upper horizontal surface of the seat on the seat base in a chair state. A base to
A seat link in which one end is pivotally supported by the base and the other end is pivotally supported by the seat base;
A pedestal installed on the floor and having the base attached thereto;
One end is pivotally supported by the back surface of the seat base, and the other end is constituted by a hoisting actuator pivotally supported by a cylinder shaft support provided on the base or the base,
By extending the hoisting actuator, the seat base is tilted so that the front rises while the seat base is raised, and the backrest tilts backward with the backrest shaft support as a rotation fulcrum due to the displacement of the seat base. A featured medical chair.   The raising / lowering actuator, the raising / lowering actuator and the upper guide are arranged in the same plane, and the raising / lowering actuator is pivotally supported in a state sandwiched from the left / right direction of the raising / lowering substrate and the posture of the raising / lowering actuator is substantially vertical. The medical chair according to claim 1, wherein the tip is connected to the seat substrate.   The backrest is rotatably supported by an extension piece extended from the upper end portion of the backrest link by a backrest shaft, and the backrest has a direction orthogonal to the axial direction of the backrest shaft. The medical chair according to claim 1 or 2, wherein a spring is built in, and the backrest is spring-biased in a prone direction and is normally fixed in contact with the extension piece.   The backrest link has a curved portion with an arcuate side surface, and standing pieces having shaft holes are formed on the left and right of the lower end of the curved portion, and a shaft hole penetrating in the left-right direction and a plane for fixing the backrest are formed on the upper end of the curved portion. 3. The medical use according to claim 1, wherein an arc-shaped pinching prevention cover formed so that the seat shaft support portion is centered on the arc is integrally attached to the backrest link. Chair.   A leg rest is pivotally supported in front of the seat base so that the leg rest is pivotally supported, and a leg rest link having one end pivotally supported by the leg rest and the other end pivotally supported by the seat link is provided. The medical chair according to claim 1 or 2, wherein the leg rest is displaced horizontally by the leg rest link as it rises.   The medical chair according to claim 6, wherein the length of the legrest link is set such that the front end of the legrest enters inward from the vertical state when the legrest is displaced in the vertical direction.

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