JP5545512B2 - Chair - Google Patents

Description

  The present invention is used when receiving treatment such as a dental clinic, an ophthalmology clinic, a full body massage, a full body esthetic, a facial esthetic, etc., and a patient in a sitting posture by changing the backrest and legrest to a horizontal state during the treatment. The present invention relates to a chair that can be transferred to a posture suitable for treatment.

  As a chair (medical chair) used for the above-described conventional treatment, there is a technique disclosed in, for example, Japanese Patent Laid-Open No. 10-127400 (Patent Document 1). 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, then change the backrest and legrest to a horizontal state and seat the patient. The posture was changed to a supine posture suitable for treatment.

  Further, in order to allow the patient to receive treatment in a comfortable posture, the seat portion is moved with the back leaning back as in the above technique and the technique disclosed in Japanese Utility Model Publication No. 59-69729 (Patent Document 2). Some have a mechanism that tilts the front so that the height is higher.

By the way, in the medical chair like patent document 1, a patient is made to sit in the state which lowered the seat part to the minimum height position so that it can sit down comfortably. When the backrest is tilted backward at that height position and shifted to a horizontal state, 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 raise the seat, then change the backrest to a horizontal state, and then finely adjust the height of the seat to make it easier for the doctor to treat if necessary Was necessary. Further, in the Patent Document 2, the structure becomes higher complex parts and assembly steps more becomes manufacturing costs, and, for technical you lift the seat was achieved does not disclose.

Furthermore, as an elevating mechanism for elevating the chair in the vertical direction, for example, a movable elevating part that is movable up and down by a cylinder as in the technique disclosed in Japanese Patent Application Laid-Open No. 58-22059 (Patent Document 3). There is an elevating device guided by an outer guide tube. In this structure, an elevating cylinder and a substantially rectangular column movable elevating part are erected in parallel, and the movable elevating part is smoothly moved up and down by a guide roller attached to an outer guide tube. Although it is possible to increase the lifting amount of the elevating part by combining a plurality of cylindrical bodies as in this invention, it is easy to generate backlash and lacks stability, and there are many parts and assembly man-hours. Therefore, the manufacturing cost becomes high. Moreover, since the raising / lowering mechanism is arrange | positioned between the seat part and the floor, when the seat part was made into the height which is easy to sit down, the raising amount of the chair was not enough.
JP-A-10-127400 Japanese Utility Model Publication No. 59-69729 JP 58-22059 A

  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 is tilted backwards at the lowest position, there is a risk of the backrest colliding with the doctor's knee, and the amount of ascending of the seat is limited. It was not possible to raise it to a suitable height.

  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.

  The present invention is intended to solve the above-mentioned problems, and its purpose is to make it easy for a patient of any physique to sit down and to easily treat without causing fear by the subsequent movement of the chair. It is an object of the present invention to provide a medical chair that can be shifted to a state, can be sufficiently raised to a height suitable for treatment, and can be manufactured simply and inexpensively.

The chair of the present invention achieves the above-mentioned object, and the means of claim 1 includes a base fixed upright on a pedestal fixed to the floor , and rotatable above the base. A backrest link pivotally supported on the backrest, a backrest with the backrest link fixed to the back surface side, and an upright plate pivotally supported on the backrest link are attached to the back and a triangular seat on the seat substrate. parts table is one side fixed to the shaft and seat the rear has become lower than the forward position in the chair state, one end of which is pivotally supported at the bottom of the base, the lower corner portion of the seat base is the other end A supported seat link, a hoisting actuator with one end pivotally supported by the pedestal and the other end pivotally supported by the seat substrate , and an upper end pivotally supported by the seat substrate and the other end at the base of the step The first parallel link that is pivotally supported and the base of the support that supports the step are pivotally supported. 2 of the parallel link, the leg rest attached to said first parallel link, one end of which is pivotally supported on the back side of the leg rest, to either the other end of said seat link or front Symbol backrest link It consists of the axially supported by the leg rest links, by extension of the pivoting actuator is raised while displacing the seat to the horizontal state, the back rest via a standing plate with an increase of the seat horizontal state And the leg rest in a horizontal state , and as the first and second parallel links change, the support base is raised while being maintained in a horizontal state, and in the bed state, the seat portion and the backrest are raised. The legrest and the step are in a horizontal state.

According to a second aspect of the present invention, there is provided a seat portion provided with an upright plate at the rear, a backrest link to which a backrest is attached and pivotally supported by the upright plate, and the backrest link being rotatable at an upper portion. a base for supporting the pedestal lower surface is fixed to the floor surface to support the base table, and the seat link which pivots one corner portion is pivotally supported on top of the base, the base of the seat portion link A hoisting actuator in which one end is pivotally supported on the other apex portion above the pivot point supported by the base and the other end is pivotally supported on the front back side of the seat portion, and one end is on the back side of the legrest A leg rest link that is pivotally supported and the other end of which is pivotally supported at a lower apex angle of the seat link, and a triangular lower corner portion that is attached in a suspended state to the back surface of the seat portion, A seat base that is pivotally supported in the middle between the hoisting actuator and the pivot point of the legrest link Configured, the seat link by extension of the pivoting actuator that rotates, characterized in that displacing raising the seat, the backrest via a standing plate with an increase of the seat in a horizontal state And

  According to a third aspect of the present invention, in the first or second aspect, the seat link is connected to a leg rest pivotally supported in front of the seat by a leg rest link, and the undulation actuator is extended. The legrest link is changed by rotating the seat link, and the legrest is changed to a horizontal state.

  According to a fourth aspect of the present invention, in the first or second aspect, the backrest link and a legrest pivotally supported in front of the seat portion are connected by a legrest link, and the undulation actuator is extended. The legrest link is changed by rotation of a backrest link, and the legrest is changed to a horizontal state.

  The means of claim 5 is the support according to claim 1 or 2, wherein the base is supported by a straight upper guide erected on the pedestal and a lift actuator arranged in parallel with the straight guide, and the lift actuator is extended, The straight guide moves the base vertically so that the base can move up and down.

According to a sixth aspect of the present invention, in the above-described fifth aspect of the present invention, the lifting actuator and the direct upper guide are located directly below the shaft support portion of the backrest link formed on the direct upper guide at a position higher than the upper horizontal surface of the seat portion in the chair state. The lift stroke of the seat is larger than that of the lift actuator alone .

  According to a seventh aspect of the present invention, in the above-described fifth aspect, the elevating actuator and the guide directly above form a cylinder standing upright in a state of being perpendicular to the pedestal, and form four corners of the cylinder as guide surfaces. And a base on which guide rollers that roll with respect to the guide surface are attached at the lower four corners, and the base is fitted on the outer periphery of the cylinder.

According to an eighth aspect of the present invention, in the above-described fifth aspect, the elevating actuator is a hydraulic cylinder attached integrally with the base, and a guide roller is pivotally supported on two surfaces orthogonal to the base. The upper guide is formed in a plane L-shape, is erected in a vertical state with respect to the pedestal, and has a guide groove formed in a plane orthogonal to each other, and the piston protrudes and descends vertically from the lifting actuator. the immediately above guide by vertically freely guiding the guide roller in the guide groove, before Kipi piston is characterized by linearly moving upward by the reaction of pressing the pedestal.

  According to Claims 1 and 2 of the chair of the present invention, by extending the hoisting actuator, the seat is raised and the backrest is higher than the horizontal plane on the upper surface of the seat. Since it changes to a horizontal state around the center, the position of the eyes and mouth of the patient is sitting on the treatment chair just by lying down without having to raise the seat in advance as in the past. The time to treatment is shortened by simple operation, and the upper end of the backrest does not hit the doctor's knee when lying down. Furthermore, since the amount of rocking of the patient's head accompanying the lying of the backrest is small, the patient's transition to the semicircular canal is reduced, and fear and discomfort are not given.

  In addition, it is possible to suppress fluctuations in the mouth position when changing the opening direction of a patient by adjusting the degree of lying on the back during treatment, and there is little correction of the height and lighting of the doctor's treatment chair and the position of the treatment instrument. It is possible to improve workability.

  Furthermore, ascending motion of the seat, tilting motion of the seat, and lying down of the backrest, the base is a fixed node, the backrest link is an output node, and the seat base and the seat link are either an input node or an intermediate node Since it has been realized in 4 sections, the number of parts and assembly man-hours can be reduced, manufacturing costs can be reduced, and the lifting actuator is not required, so the entire product is compact and the number of parts and assembly man-hours are greatly increased. The manufacturing cost is reduced.

  Further, in the first aspect, since the seat portion that is slightly inclined so as to be higher in the chair state is leveled while being raised together with the lying down of the backrest, the patient in the state where the backrest stands upright. Can take a stable sitting posture, and in a state where the backrest is lying down, the operator can lay the patient on the same horizontal surface where the backrest and the seating surface are completely the same.

  According to claims 3 and 4, since the legrest link is added, the legrest is changed from the vertical state to the horizontal state as the seat rises and the backrest is overlaid. This makes it easier to get on and off and to easily shift to a supine posture.

  In claim 5, the base is supported by a straight upper guide erected on the pedestal and a lift actuator arranged in parallel with the straight guide, the lift actuator extends, and the straight guide guides the base. Since the base moves straight upward by guiding it to move up and down, the entire chair moves up and down by the expansion and contraction of the lifting actuator through the base, so that the doctor adjusts the height of the chair Thus, the treatment site of the patient can be adjusted to the height desired by the doctor.

In claim 6, since the lifting actuator and the directly above guide are erected directly below the shaft support portion of the backrest link formed on the above directly above guide at a position higher than the horizontal surface of the upper surface of the seat portion in the chair state, Compared to the conventional case where the lifting actuator and the upper guide are set up directly below the seat, the lifting stroke can be increased, so the initial position of the seat is lower than before, and the amount of lift of the seat is higher than before. In particular, it is easy for children and elderly people to get on and off the chair, and for the doctor, it can be raised to a height suitable for examination and treatment in a standing position.

  According to a seventh aspect of the present invention, the lifting and lowering actuator is formed such that the cylinder of the actuator erected in a vertical state with respect to the pedestal is formed in a quadrangular shape, and the four corners of the cylinder are used as guide surfaces, and the guide is directly above the outer periphery of the cylinder Since the guide rollers that roll with respect to the guide surface are attached to the upper four corners of the upper guide, it is more compact than the case where the upper guide and the lifting actuator are erected separately.

  According to the eighth aspect of the present invention, the lifting actuator is a hydraulic cylinder that is integrally attached to the base. Guide rollers are pivotally supported on two surfaces orthogonal to the base, and the guide has a planar L shape. The guide groove is formed on the surfaces perpendicular to each other and perpendicular to the pedestal, the piston protrudes and descends vertically from the lifting actuator, and the guide guides the guide roller at the guide groove. By guiding the base up and down freely, the base is made to move straight upward by the reaction of the piston pressing the base, so that the guide directly above is compared to the case where the movable lifting part of the substantially quadrangular prism is surrounded by guide rollers from four directions. It becomes compact. Further, by increasing the number of guide rollers, it is possible to obtain effects such as suppressing the occurrence of backlash and maintaining the chair posture with sufficient rigidity against the load change in the front-rear direction of the chair.

  The present invention makes it easy for a patient of any physique to be seated, can move to a state suitable for treatment without fear of the subsequent movement of the chair, and can be raised to a height suitable for treatment. It can be a therapeutic chair.

A first embodiment in which the chair according to the present invention is a medical chair will be described below with reference to FIGS .
1 is a pedestal fixed to the floor of a hospital such as a dental clinic or otolaryngology clinic, 2 is a pair of bases fixed in a slightly inclined direction from the pedestal obliquely rearward, and 3 is a backrest The backrest substrate 3a of the backrest 3 is pivotally supported on a shaft 3b so as to be rotatable from both sides on the top of the base 2. A backrest link 3c is attached in a state of protruding forward from both side surfaces of the backrest substrate 3a.

  Reference numeral 4 denotes a seat portion, and upright plates 4b on which one end of the backrest link 3c is pivotally supported are integrally attached to both sides of the seat portion substrate 4a of the seat portion 4. The shaft fulcrum between the upright plate 4b and the backrest link 3c is lower than the shaft 3b between the base 2 and the backrest link 3c. In addition, the seat 4 is in a chair state where the rear is lower than the front, and the patient is seated on the seat 4 in a stable posture. However, although the front of the seat portion 4 is configured to be higher than the rear as in this embodiment, the present invention is not necessarily limited to this embodiment, and may be in a horizontal state in a chair state.

  Reference numeral 5 designates a seat base in which one side formed in a triangular shape in the figure is fixed on the back surface of the seat substrate 4a, and one end of the corner portion of the seat base 5 is pivotally supported below the base 2. The other end of the U-shaped seat link 6 is pivotally supported.

  7 is a hoisting actuator having one end pivotally supported by the seat substrate 4a and the other end pivotally supported by the pedestal 1, and 8 and 9 are parallel links whose upper ends are pivotally supported by the left and right of the seat substrate 4a. The other end is pivotally supported by the support 10a of the step 10 when the patient sits on the seat 4b. A legrest 11 is attached to one parallel link 8, and a legrest link whose one end is pivotally supported by a U-shaped intermediate portion of the seat link 6 on a fixed shaft 11 a provided between 8. The other end of 12 is pivotally supported.

  Next, the operation will be described based on the above-described configuration. In the state of the chair shown in FIG. 1, the back of the seat 4 is inclined downward, so that the patient is seated on the seat 4 from step 10a. A stable posture. When the foot switch provided on the pedestal 1 or the button-like switch provided on the doctor table (both not shown) is operated in this seated state, oil is injected into the undulation actuator 7 and the piston protrudes. The rear side of the seat substrate 4a is pushed up.

  When the seat base plate 4a is pushed up, the backrest link 3c pivotally supported on the upright plate 4b of the seat base plate 4a is rotated clockwise around the pivot point 3b with the base 2 as a seat. As part 4 rises, backrest 3 changes to a prone state.

At this time, since the axis 3b of the backrest 3 is higher than the horizontal surface of the upper surface of the seat 4, even if the seat is not lifted in advance as in the prior art, the patient 's eyes and mouth are simply tilted backward. This position is suitable for the doctor sitting on the treatment chair, and the time until the treatment can be shortened and the upper end of the backrest 3 does not hit the doctor's knee.

  In addition, since the amount of swinging of the patient's head associated with the back tilt 3 is small, the patient's transition to the semicircular canal is small, and there is no fear or discomfort. When the opening direction of the patient is changed by adjusting the position of the patient, fluctuations in the position of the mouth can be suppressed, and the height and illumination of the doctor's treatment chair and correction of the position of the treatment instrument can be reduced, and workability is improved.

As the seat substrate 4a rises, the seat base 5 attached to the back surface of the seat substrate 4a also rises, so that the seat link 6 pivotally supported at the tip of the seat base 5 is provided. It rotates clockwise about a pivot point 6a with the base 2 as the center of rotation. That is , for the seat base 5, the seat link 6 rotates clockwise around the pivot point 5a.

The force that the seat link 6 rotates clockwise around the pivot point 5a is transmitted to the parallel link 8 via the leg rest link 12, and the parallel link 8 has the pivot point with the seat substrate 4a as the center of rotation. Since it is rotated in the clockwise direction, the leg rest 11 also moves together with the parallel link 8. Further, the transition of the parallel link 8, another parallel link 9 pivotally supported via a support base 10a and the parallel link 8 also shifted together with the parallel link 8, therefore, the support table 10a while maintaining a horizontal state To rise.

  When the seat substrate 4a is raised, the seat substrate 4a in the rearward tilted posture gradually becomes horizontal. In order to shift the seat substrate 4a to the horizontal state, it is possible to appropriately determine the distances 3b and 4c, the distances 3b and 6a, the distances 6a and 5a, and the distance 5a and 4c (see FIG. 2).

  Furthermore, when the doctor is performing treatment from the front or side of the patient while the patient is seated, it can be shifted to a position where treatment can be easily performed by adjusting the discharge amount of the piston of the hoisting actuator 7. Then, when the patient is treated in a supine posture, when oil is further supplied to the hoisting actuator 7, as shown in FIG. 3, the backrest 3, the leg rest 11 and the seat rest 4 are provided. Step 10 becomes flat, and the patient is supported from the head to the toes by the backrest 3, the seat 4, the legrest 11 and Step 10, and can receive treatment in an easy posture.

In the above description, the other end of the legrest link 12 whose one end is pivotally supported by the parallel link 8 is pivotally supported by the intermediate portion of the seat link 6, and the parallel link 8 is raised and lowered. Although the case where the legrest 11 is raised and lowered along with the ups and downs has been described, the other end of the legrest link 12 is pivotally supported by the extension part extending below the backrest link 3c as shown by the phantom line in FIG. As described above, the backrest substrate 3, the parallel links 8, 9 and the legrest 11 can be raised and lowered as the seat substrate 4a is raised and lowered.

Next, the second embodiment will be described with reference to FIGS. Note that the same reference numerals as those in the first embodiment denote the same members, and a description thereof will be omitted.
In the second embodiment, a backrest link 3c is attached to a lower end portion of a backrest substrate (not shown) of the backrest 3 , and the backrest link 3c is formed from an arc portion on an arcuate side surface. The distal end of the connecting portion 3d formed in an L shape is connected to a shaft fulcrum 4c with the upright plate 4b of the seat portion 4 in the first embodiment.

Further, the seat link 6 is formed in a square shape, and one of the upper apex angles is pivotally supported above the base 2, and the intermediate portion of the seat link 6 is the same as in the first embodiment. In the same manner as described above, it is pivotally supported at the lower corner of the triangular seat base 5 attached to the back surface of the seat 4, and the piston tip of the hoisting actuator 7 is supported by the base 2. It is pivotally supported at another apex angle above the pivot point of the link 6. Note that the cylinder side of the hoisting actuator 7 is pivotally supported in front of a seat substrate (not shown). Further, the other end of the legrest link 12 whose one end is pivotally supported on the back side of the legrest 11 is pivotally supported at the apex angle below the seat link 6. In this state, the length of the leg rest link 12 is set so that the front end side of the leg rest 11 enters inside the front end surface of the seat portion 4.

  Reference numeral 13 denotes a headrest attached to the upper portion of the backrest 3, and an arc-shaped arm (not shown) is attached to the lower portion of the headrest 13, and this arm is guided by a guide roller built in the headrest box 13a. The headrest 13 moves to the occipital region of the patient seated while being guided by a guide roller that lifts the headrest 13, so that the patient's occipital region is reliably supported.

Next, the operation will be described based on the above-described configuration. In order to perform the treatment after the patient is seated and the counseling is completed in the chair state shown in FIG. 4, a foot switch provided on the pedestal 1 or a doctor table is used. by operating the button-like switch provided (both not shown), the piston protrudes oil is injected into the hoisting actuator 7, the seat link 6, rotating the shaft supporting point 5a of the seat base 5 Rotates clockwise as the center.

  As a result, the seat link is raised and rotated in the clockwise direction with respect to the pivot point 6a with respect to the base 2, so that the seat base 5 is pushed obliquely forward and the seat 4 is raised. As the seat 4 is raised, the backrest link 3c pivotally supported at the connection point 4c of the upright plate 4b of the seat 4 is shifted, and as the seat 4 is raised, the pivot 3b is used as the center of rotation. Since the backrest link 3c changes in the clockwise direction, the backrest 3 changes in the prone direction.

  Further, the force that the seat link 6 rotates clockwise about the pivot point 5 a with the seat base 5 is transmitted to the leg rest 11 via the leg rest link 12, and the leg rest 11 is the tip of the seat 4. It shifts in the horizontal direction around the pivot point (see FIG. 5).

  Furthermore, in order to shift from the state of FIG. 5 to a state where a doctor can easily treat, it is possible to adjust to the position of FIG. 6 which is the final position by adjusting the discharge amount of the piston of the hoisting actuator 7. Since the legrest 11 is formed in such a length that the front end enters the back side of the seat 4 in the chair state of FIG. 4, the legrest 11 is located in front of the seat 4 when the legrest 11 is moved in the horizontal direction. A considerable amount of protrusion will be projected, so that it is possible to sufficiently support the legs of tall patients.

  When the treatment is finished, the seat 4 is lowered by the operation opposite to the above-described operation by draining the oil in the hoisting actuator 7, and the backrest 3 and the legrest 11 are changed in the standing direction. Note that when the legrest 11 is in the final chair state, the distal end side of the legrest 11 is inward from the distal end surface of the seat portion 4, so that the patient's heel position that has shifted to the sitting state is behind the knee position. Even people who do not have muscle strength like the elderly can stand up without the assistance of a doctor or assistant.

  In the above description, the case where the legrest 11 is raised and lowered by pivotally supporting the other end of the legrest link 12 whose one end is pivotally supported by the legrest 11 to the seat link 5 has been described. 4, the other end of the leg rest link 12 is pivotally supported at the tip of the backrest link 3 as shown by the phantom line in FIG. Can be undulated.

In the second embodiment described above, the chair portion is attached to the base 2 fixed to the pedestal 1, and the height of the entire chair cannot be adjusted. 7 to 11, the entire chair can be moved up and down by the lifting / lowering actuator by supporting the base by an upright guide erected on the pedestal and the lifting / lowering actuator, and lifting and lowering the base by extending / lowering the lifting / lowering actuator. and was it also to the. The same reference numerals as those in the second embodiment denote the same members, and the operation of the chair is also the same, so that the description thereof is omitted.

A is an example of a direct upper guide and an actuator for raising and lowering, and as shown in FIGS. 9 to 11, a cylinder 14 b having a quadrangular cross section and a flat cut at four corners to form a guide surface 14 a of a guide roller described later. And a piston 14c that rises and falls by injecting and discharging oil, and a pair of upper and lower guide rollers 15a surrounding the four guide surfaces 14a of the cylinder 14b from four directions, and the upper end of the piston 14c is attached. It is composed of a straight upper guide 15. 9 and 10 do not disclose the guide roller, the structure thereof is shown in FIG.

Further, a backrest mounting portion 15b for supporting the shaft 3b of the backrest link 3a and a seat link mounting portion 15c for supporting the seat link 6 described above are attached to the upper part of the guide 15 directly above. It has been.

  In the direct upper guide and the lifting actuator A configured in this way, when oil is injected into the cylinder 14b in the state of FIG. 9, the piston 14c rises, so the direct upper guide 15 also rises by the piston 14c. Since the guide roller 15a of the upper guide 15 rolls on the guide surface 14a of the cylinder 14b, the upper guide 15 moves smoothly on the cylinder 14b.

The chair is moved up and down as shown in FIG. 7 or ascended as shown in FIG. 8, and the actuator for raising and lowering at any position while raising the seat 3 while injecting oil into the hoisting actuator 7. When oil is injected into or discharged from the actuator 14 of A, the upper guide 15 moves up and down, so that the chair can be raised and lowered.

FIGS. 12 to 15 show a direct guide and lift actuator B of another embodiment different from the above direct guide and lift actuator A. FIG.
In this embodiment, as shown in FIG. 12, the actuator 14 is a hydraulic cylinder, and the cylinder 14 b is configured integrally with the base 15.
The upper portion of the base 15 is formed with backrest mounting portions 15d and 15b, and the seat link mounting portions 15e and 15c are formed integrally with the intermediate portion. The guide rollers are pivotally supported on two orthogonal surfaces. Has been.

  Reference numeral 17 denotes a guide member formed in a flat L-shape fixed to the base 1, and guide grooves 16 a and 16 b are formed in adjacent orthogonal surfaces as shown in FIGS. 13 to 15. Four guide rollers 15d attached to the base 15 are guided in one guide groove 16a, and a surface orthogonal to the surface on which the four guide rollers 15d are attached to the other guide groove 16b. The two guide rollers 15e are guided.

  In this embodiment, four guide rollers 15d are attached to a surface orthogonal to the shaft 3b provided in the backrest attachment portion 15b, and two guide rollers 15e are attached to the other surface. The arrangement of different numbers of guide rollers with respect to the guide grooves 16a and 16b in this way applies a force to invert the base in the front-rear direction, particularly when the patient is seated on the chair. In such a case, the posture of the chair can be held with sufficient rigidity by the plurality of guide rollers.

  In addition, since there is a gap between the guide groove and the guide roller, when the center of gravity of the entire chair including the patient's weight on the chair changes due to the ups and downs of the backrest 3 or the like, However, the backlash can be suppressed by using a structure that adjusts the distance between the front and rear of the plurality of guide rollers attached to the base during assembly.

  In the straight guide and the lifting actuator B configured as described above, when oil is injected into the actuator 14 to raise and lower the chair, the piston 14c appears vertically downward, but its tip contacts the upper surface of the base 1 Therefore, the base 15 integrated with the cylinder rises while the guide rollers 15d and 15e pivotally supported by the base 15 are guided by the guide grooves 16a and 16b. Further, by removing the oil from the actuator 14, the directly above guide 15 is lowered and the chair is lowered.

It is a side view showing the initial state which shows the 1st example of the chair concerning the present invention. It is a side view which shows the state which changed to the raise direction slightly from the initial state of FIG. It is a side view which shows the state which rose further from the state of FIG. 2, and changed to the medical treatment state. It is a side view which shows the initial state which shows a 2nd Example. It is a side view which shows the state which rose further from the state of FIG. 4, and changed to the medical treatment state. It is a side view which shows the state which further raised from the state of FIG. 5, and changed to the medical treatment state. It is a side view which shows the initial state which shows a 3rd Example. It is a side view which shows the state which changed to the medical treatment state from the state of FIG. FIG. 8 is a side view of a section of the lifting actuator in the initial state of FIG. 7. FIG. 9 is a cross-sectional side view of the lifting and lowering actuator and the upper guide in a state of being changed to the medical state in FIG. 8. It is a perspective view which shows the inside of an actuator for raising / lowering and a guide directly above. It is a perspective view which shows the actuator part for raising / lowering of another Example. FIG. 13 is a perspective view of a state in which the lifting / lowering actuator of FIG. It is the perspective view seen from the bottom face of FIG. It is the top view seen from the upper surface of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Base 3 Backrest 3c Backrest link 3d Connection part 4 Seat part 4b Standing plate 5 Seat base 6 Seat link 7 Lifting actuator 11 Leg rest 12 Leg rest link

Claims (8)

A base (2) fixed upright on a pedestal (1) fixed to the floor;
A back link (3c) pivotally supported above the base;
A backrest (3) in which the backrest link is fixed to the back side;
The upright plate (4b) pivotally supported by the backrest link is attached to the rear, and one side of the triangular seat base (5) is fixed to the seat base (4a) , and the rear is lower than the front in the chair state. The seat (4) in position,
One end of which is pivotally supported at the bottom of the base and the other end pivotally supported by the seat link under direction of the seat base (6),
A hoisting actuator (7) having one end pivotally supported by the pedestal and the other end pivotally supported by the seat substrate ;
The first parallel link (8) whose upper end is pivotally supported by the seat substrate and the other end is pivotally supported by the base of the step (10), and the base of the support base (10a) supporting the step are pivotally supported. A second parallel link (9);
A legrest (11) attached to the first parallel link;
One on the back side of the leg rest is pivotally supported and the other end constitutes from said seat link or before Symbol pivotally supported on one of the backrest linked leg rest link (12),
Raised while displacing the horizontal state the seat by extension of the pivoting actuator, thereby displacing the leg rest in a horizontal state causes displacing the backrest via a standing plate with an increase of the seat in a horizontal state And raising the support table in a horizontal state as the first and second parallel links change, and bringing the seat, backrest, legrest, and step into a horizontal state in the bed state. Characteristic chair. A seat (4) provided with an upright plate (4b) at the rear;
A backrest link (3c) to which the backrest (3) is attached and pivotally supported by the upright plate;
A base (2) for rotatably supporting the backrest link in the upper part ;
A pedestal (1) having a lower surface supporting the base fixed to the floor surface ;
A seat link (6) that pivots with a corner portion pivotally supported on the top of the base;
A hoisting actuator (7) having one end pivotally supported at the other apex angle portion above the pivot point pivotally supported by the base of the seat link and the other end pivotally supported by the front back side of the seat portion. When,
A legrest link (12) having one end pivotally supported on the back side of the legrest (11) and the other end pivotally supported on the apex angle below the seat link;
A seat base (5) in which a triangular lower corner portion attached to the back surface of the seat portion is pivotally supported by an intermediate portion between the raising / lowering actuator of the seat portion link and the pivot point of the leg rest link. And consisting of
The seat link is rotated by the extension of the hoisting actuator, so that the seat is raised, and the backrest is changed to a horizontal state via the upright plate as the seat rises. .   The leg link is moved by connecting the seat link and a leg rest pivotally supported in front of the seat by the leg rest link, and the seat link is rotated by extension of the hoisting actuator. The chair according to claim 1 or 2, wherein the legrest is changed to a horizontal state.   The backrest link and a legrest pivotally supported in front of the seat are connected by a legrest link, and the legrest link is changed by the rotation of the backrest link due to the extension of the hoisting actuator. The chair according to claim 1 or 2, wherein the legrest is changed to a horizontal state.   The base is supported by an upright guide erected on the pedestal and an elevating actuator arranged in parallel to the upright guide, the elevating actuator is extended, and the upper guide guides the base so that it can move up and down. The chair according to claim 1, wherein the base moves straight upward. Directly above the guide and the lifting actuator, erected beneath the shaft support of the directly guide the formed backrest linked to a higher position top horizontal surface of said seat portion in the chair state, the seat than elevating actuator only 6. The chair according to claim 5, wherein the lifting stroke is increased.   The elevating actuator and the guide directly above form a cylinder standing upright in a state of being perpendicular to the pedestal in a rectangular shape, and have four corners of the cylinder as guide surfaces, and lower four corners with respect to the guide surface. 6. The chair according to claim 5, wherein the chair is configured by a base on which a moving guide roller is attached, and the base is fitted on the outer periphery of the cylinder. The elevating actuator is a hydraulic cylinder that is integrally attached to the base. Guide rollers are pivotally supported on two orthogonal surfaces of the base, and the upper guide is formed in a plane L shape. are the guide groove is formed in the plane orthogonal to each other while being erected in a vertical state with respect to the base, the piston is retractable vertically downward from the lifting actuator, the immediately above guide freely up and down the guide rollers in the guide grooves guided by claim 5 chair according to previous Kipi piston is characterized by linearly moving upward by the reaction of pressing the pedestal.

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