JP6856332B2 - Lifting device and medical clinic - Google Patents

Description

The present invention relates to an elevating device for elevating and lowering a seat or the like on which a patient sits, and a medical clinic provided with the elevating device.

The medical clinic used in dentistry and otolaryngology is equipped with an elevating device that raises and lowers the patient support part that supports the patient's body in the vertical direction, which makes it easy for the practitioner to perform the procedure and for the patient to get on and off. The patient support can be adjusted as appropriate.

For example, Patent Document 1 discloses a medical clinic in which the patient support portion can be adjusted to a desired height.
More specifically, in the medical clinic, a second drive unit for raising and lowering the second elevating member is attached to a first elevating member that is elevated and lowered by the first drive unit fixed to the base. Since the second elevating member is assembled with a third drive unit that raises and lowers the patient support portion, by raising and lowering these drive units, the patient support portion can be appropriately moved between the lowest position and the highest position. Can be changed. At this time, the first cylinder slides on the fixed shaft fixed to the base, and the second cylinder housed inside the first cylinder slides on the first cylinder. The patient support portion is accommodated inside the second cylinder body, and the third cylinder body in which the patient support portion is fixed to the upper end is configured to slide with respect to the second cylinder body so that the patient support portion can be provided. It is said that it can be raised and lowered smoothly.

However, the third cylinder for fixing the patient support portion has a reduced diameter and is more susceptible to the action of an external force than the first cylinder and the second cylinder, and the third cylinder is attached to the fixed shaft. Since the structure is slidable with respect to the second cylinder that slides with respect to the fixed first cylinder, the third cylinder is fixed to the base as the patient support portion becomes higher. The higher the position of the patient support, the more unstable it may be.

Japanese Unexamined Patent Publication No. 2010-240337

In view of the above problems, an object of the present invention is to provide an elevating device and a medical clinic capable of stably elevating and lowering a patient support portion.

The present invention includes a fixed shaft that extends in the vertical direction and is fixed to a base, a moving shaft that is connected to a patient support portion that supports the patient at the upper end portion, and is arranged in parallel with the fixed shaft. A connecting elevating member that connects the fixed shaft and the moving shaft and can be moved up and down along the fixed shaft, a first driving unit that raises and lowers the connecting elevating member with respect to the fixed shaft, and the moving shaft are described. A second drive unit for elevating and lowering the connecting elevating member is provided, the fixed shaft and the moving shaft have the same length in the vertical direction, and the connecting elevating member is provided on the outer peripheral surface of the fixed shaft. It has a guided portion that is fitted and guided in the vertical direction along the fixed shaft, and is fitted to the fixed shaft side elevating portion that moves up and down with respect to the fixed shaft and the outer peripheral surface of the moving shaft. The moving shaft side elevating portion is provided with a guide portion for guiding the elevating direction of the moving shaft, and is integrally connected with the moving shaft side elevating portion arranged in parallel with the fixed shaft side elevating portion. The fixed shaft side elevating part is composed of half the length of the fixed shaft in the vertical direction, and the moving shaft side elevating part is in the vertical direction as compared with the fixed shaft side elevating part. It is characterized in that it is an elevating device arranged on the upper side of.

The present invention is also characterized in that the above-mentioned elevating device is provided, and the patient support portion is a medical medical table composed of a seat support portion to which a seat on which the patient sits is fixed.

The patient support portion is a member that supports the patient when the elevating device is raised and lowered. For example, in addition to a seat support portion that fixes a seat seat that tiltably connects a back plate seat to one end, a tilting back plate seat. It may be a seat support portion or the like which forms a flat seat by connecting the back plate and the seat without holding the seat.

The drive unit includes a power cylinder that raises and lowers the connecting elevating member in the vertical direction by pushing out a rod, a gear structure that raises and lowers the connecting elevating member in the vertical direction by rotating a gear, and the like. Specifically, the power cylinder includes a hydraulic cylinder that is driven up and down by using hydraulic pressure, a cylinder that is driven up and down by using water pressure and air pressure, an electric cylinder that is moved up and down by electric power such as a motor, and the gear structure. A gear provided on the chamfered portion and the rolling element are used as gears, and the fixed shaft is moved up and down by the rotation of the rolling element, or a rack is provided along the fixed shaft and a gear (pinion) meshing with the rack is used as a motor. Includes a gear structure that is rotated by such means.
The first drive unit and the second drive unit may have the same or different configurations.

The term "fitted to the outer peripheral surface of the fixed shaft or the moving shaft" refers to a state in which the connecting elevating member is fitted to such an extent that the connecting elevating member can move relative to the fixed shaft or the moving shaft in the vertical direction. .. That is, the connecting elevating member provided with the guided portion and the fixed shaft can move relative to each other in the vertical direction, and the connecting elevating member provided with the guide portion and the moving shaft move in the vertical direction. On the other hand, it is a configuration that can move relative to each other.

The guided portion and the guided portion may have a shape that is fitted so as to be able to guide the connecting elevating member in the vertical direction along the fixed shaft or the moving shaft, and for example, the guided portion and the guide. The cross section of the portion includes a shape that is similar to the cross-sectional shape of the outer peripheral surface of the fixed shaft and the moving shaft, and a shape that is partially similar to the outer peripheral surface of the fixed shaft and can be fitted. Specifically, it includes a through hole having substantially the same shape as the bottom surface of the fixed shaft of the columnar body, a through hole that fits with a part of the outer peripheral surface of the fixed shaft, and the like.

According to the present invention, the patient support portion can be raised and lowered in a stable manner.
More specifically, by fitting the guided portion to the outer peripheral surface of the fixed shaft fixed to the base, the connecting elevating member is fixed so as to be able to move up and down with respect to the fixed shaft. , The elevating member can be stably moved up and down with respect to the fixed shaft. Further, since the moving shaft is fitted to the guide portion provided on the connecting elevating member so as to be able to move up and down, the connecting elevating member is fixed even if an external force acts on the moving shaft. Since the external force can be received by the fixed shaft, the patient support portion connected to the upper end of the moving shaft can be stably moved up and down in accordance with the raising and lowering of the second drive unit.

Further, for example, when the first drive unit and the second drive unit are the same drive unit, the stroke of each drive unit can be halved as compared with the case where one drive unit is used. .. That is, the height of the elevating device in a state where the first drive unit and the second drive unit are contracted can be halved as compared with the case where the drive unit is one, and the height of the elevating device can be halved as compared with the case where the drive unit is one. In comparison, the sizes of the first drive unit and the second drive unit can be reduced in the vertical direction.

Further, as described above, since the strokes of the first drive unit and the second drive unit can be halved as compared with the case where the drive unit is one, when a force acts in a direction intersecting the fixed shafts. Even if there is, the torque acting on the first drive unit and the second drive unit can be reduced. Therefore, the member strength of each drive unit can be reduced. From this, it is possible to increase the choices of the members used for the first drive unit and the second drive unit, and it is possible to reduce the weight and cost.

As an aspect of the present invention, a hydraulic pump may be provided in which the first drive unit and the second drive unit are each composed of a hydraulic cylinder, and the hydraulic cylinder is driven by applying hydraulic pressure.
The hydraulic pump may be the same or separate hydraulic pump for the first drive unit and the second drive unit.

According to the present invention, it is possible to increase the output and responsiveness as compared with the case where the first drive unit and the second drive unit are moved up and down by air pressure or the like, and the first drive unit and the second drive unit are made smaller. Can be transformed into. Further, since the hydraulic cylinder can be driven smoothly with less vibration, the connecting elevating member can be moved up and down smoothly.

Further, as an aspect of the present invention, the first drive unit and the second drive unit are composed of a hydraulic cylinder having the same thrust that exerts the same thrust with respect to the same pressure, and the first drive unit and the second drive unit. One hydraulic pump may be provided for the second drive unit, and hydraulic pressure may be applied to both the first drive unit and the second drive unit configured by the hydraulic cylinder.

The above-mentioned hydraulic cylinder with the same thrust that exerts the same thrust for the same pressure is
For example, it refers to a hydraulic cylinder having a configuration in which the moving distance of a cylinder rod in the hydraulic cylinder is equal to the fluid volume of oil flowing from the hydraulic pump into the inside of the hydraulic cylinder by operating the hydraulic pump.

According to the present invention, the first drive unit and the second drive unit can be easily controlled, and both the first drive unit and the second drive unit can be driven at the same time, so that the load is significantly increased on one side. It is possible to prevent bias.
As the hydraulic cylinder, a compact hydraulic cylinder having the same thrust may be adopted.

Further, if the hydraulic pipe connected to the hydraulic pump is branched and connected to the first drive unit and the second drive unit, the height of the patient support unit is irrespective of the position of the connecting elevating member. Can be kept constant, and the stability of the patient position can be ensured.

More specifically, for example, when the first drive unit and the second drive unit are connected to different hydraulic pumps, the connecting elevating member unintentionally lowers, that is, the pressure of the first drive unit. When is reduced, the patient support portion is lowered by the lowered distance of the connecting elevating member.

On the other hand, when the hydraulic pipe of one hydraulic pump is branched and connected to the first drive unit and the second drive unit, the pressure of the hydraulic pump is applied to the first drive unit and the second drive unit. Since the pressure is distributed among the units, when the pressure of the first driving unit decreases, the pressure of the second driving unit increases by the amount of the reduced pressure. Therefore, the decompression of the first drive unit raises the patient support portion in which the connecting elevating member is connected to the second drive unit by the amount of lowering, and the height of the patient support portion can be maintained.

In this way, even if the height of the connecting elevating member is unintentionally changed, the height of the patient support portion does not change, so that the patient does not unintentionally ascend or descend, and the treatment is performed. The height of the position can be surely secured.

Further, as an aspect of the present invention, a synchronization mechanism may be provided that synchronizes the raising and lowering of the connecting elevating member with respect to the fixed shaft and the raising and lowering of the moving shaft with respect to the connecting elevating member.

The synchronization mechanism is an adjusting mechanism that adjusts the elevating distance of the moving shaft with respect to the connecting elevating member according to the elevating distance of the connecting elevating member with respect to the fixed shaft. In other words, it refers to a mechanism that makes the stroke of the first drive unit and the stroke of the second drive unit the same.

According to the present invention, even when the external force acting on the first drive unit and the second drive unit are different, the first drive unit and the second drive unit can be simultaneously driven with substantially the same stroke. it can.
More specifically, for example, when the first drive unit and the second drive unit configured by the same drive unit are controlled by a hydraulic pump, the pressure acting on the first drive unit and the second drive unit When the pressure acting on the first drive unit and the second drive unit are different, the strokes of the first drive unit and the second drive unit are different. However, by providing the synchronization mechanism, the first drive unit and the second drive unit can be combined with each other. One drive unit can be pulled up so that the stroke amount is the same. As a result, the first drive unit or the second drive unit can be driven in the same manner, so that it is possible to prevent the durability of only one of the first drive unit or the second drive unit from deteriorating.

Further, since the stroke amount of the connecting elevating member is controlled by half with respect to the stroke on the moving shaft side, the position detecting mechanism can be obtained by using the connecting elevating member instead of the moving shaft side as the elevating position detection target member. The stroke is also halved, and the configuration can be miniaturized and simplified.

Further, as an aspect of the present invention, the synchronization mechanism is fixed to the gear provided on the connecting elevating member, one end side is fixed to the fixed shaft side and the other end side is fixed to the moving shaft side, and meshes with the gear. It may be composed of a cord body.
The cord body is a flexible member having a predetermined hardness and being bendable and foldable, and includes, for example, a chain, a wire, a resin wire, a rack and pinion, a ball screw, a sliding screw, a rail mechanism, and the like.

According to the present invention, the elevating and lowering of the connecting elevating member with respect to the fixed shaft and the elevating and lowering of the moving shaft with respect to the connecting elevating member can be reliably synchronized with a simple configuration. Further, it is simpler and more stable than the case where the elevating and lowering of the connecting elevating member with respect to the fixed shaft and the elevating and lowering of the moving shaft with respect to the connecting elevating member are synchronized by using a complicated configuration such as an electronic mechanism. Can be raised and lowered.

Further, by configuring the thrust corresponding to the own weight load of the connecting elevating member to be the same as the thrust difference between the first drive unit and the second drive unit, the synchronous load of the synchronization mechanism can be minimized. Durability can be improved and parts can be simplified.

Further, as an aspect of the present invention, the fixed shaft and the moving shaft are formed of a columnar body having a chamfered portion that is chamfered in a plane extending in the axial direction on the outer peripheral surface of the cylindrical body, and the guided portion and the guided portion. May be provided with a rolling element that rolls with respect to the chamfered portion.
The chamfering refers to creating a flat surface portion by taking a curved surface, and includes, for example, a case where the outer peripheral surface of a cylindrical body is chamfered, and a case where the outer peripheral surface is cut, polished, forged, ground, or forged. The columnar body formed on the outer peripheral surface of the columnar body may be a columnar body having only one chamfered portion formed therein, or may be a multifaceted columnar body having a substantially triangular columnar body or more.

According to the present invention, it is possible to prevent the relative rotation of the patient support portion that supports the patient with respect to the base.
More specifically, the connecting elevating member includes the guided portion that fits against the outer peripheral surface of the fixed shaft having the chamfered portion, and chamfers in the circumferential direction on the inner peripheral surface of the guided portion. Since a rolling element that rolls with respect to the portion is provided, even if an external force acts on the connecting elevating member and the connecting elevating member tries to rotate with the fixed shaft as a rotation axis, it moves up and down. The rolling element interferes with the chamfered portion formed in a plane along the direction, and the relative rotation of the connecting elevating member can be prevented.

Further, since the connected elevating member can be moved up and down in the vertical direction by fitting the guided portion to the outer peripheral surface of the fixed shaft fixed to the base, for example, the driving portion is extended. Even so, the fixed shaft does not tilt due to an external force acting on the patient support portion, and the connecting elevating member can be moved up and down more stably.

Furthermore, the rolling body interferes with the chamfered portion to prevent the relative rotation of the connecting elevating member, but even if the rolling body interferes with the fixed shaft, the rolling body is prevented from rotating. The moving body rolls with respect to the chamfered portion, and the connecting elevating member can be smoothly moved up and down.
By fitting the connecting elevating member vertically to the fixed shaft fixed to the base in this way, the connecting elevating member can be smoothly moved up and down while preventing the relative rotation of the connecting elevating member. The patient support portion can be raised and lowered more stably.

Further, as an aspect of the present invention, the fixed shaft and the moving shaft may be formed of a substantially square columnar body having chamfered portions in four directions on the outer peripheral surface of the columnar body.
According to the present invention, even when an external force acts on the connecting elevating member and the connecting elevating member tries to rotate with the fixed shaft as a rotation axis, the chamfered portion is formed on four surfaces. The rolling element comes into contact with the plurality of chamfered portions, so that the relative rotation of the connecting elevating member can be reliably prevented, and the load can be prevented from being concentrated only on the rolling element facing the predetermined surface.

Furthermore, since the fixed shaft and the moving shaft, which are substantially square columnar bodies, are not eccentric with respect to the base in any circumferential direction, the acting load can be made uniform. Therefore, for example, even when the fixed shaft is rotated by 90 degrees, the guided portion can be fitted to the fixed shaft without rotating and arranging the connecting elevating member with respect to the fixed shaft. That is, it is possible to eliminate the restriction on the arrangement direction of the connecting elevating member with respect to the arrangement direction of the fixed shaft and the like.

As an aspect of the present invention, the rolling elements and the chamfered portions are arranged in a direction in which the rolling elements and chamfered portions intersect 45 degrees with respect to the arrangement direction of the moving shaft with respect to the fixed shaft, and are arranged at different positions in the vertical direction. May be good.

According to the present invention, the fixed shaft side rolling element that abuts on the fixed shaft side surface portion and the moving shaft side rolling element that abuts on the moving shaft side surface portion can be brought close to each other so as not to interfere with each other. It is possible to further reduce the installation area of the lift device and secure a space around the lifting device.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide an elevating device and a medical medical table capable of stably elevating and lowering the patient support portion.

Schematic side view of a medical clinic. Schematic perspective view of the lifting device. Explanatory view of the shaft part. Schematic perspective view of the hydraulic drive unit. Explanatory drawing about the outline shape of an elevating member. Side view and plan view of the elevating member Explanatory drawing of bearing and support member. Explanatory drawing of a synchronization mechanism and a position detection mechanism. Explanatory drawing about the assembly of the lifting device. Explanatory drawing about contact between a chamfer part and a bearing. Explanatory drawing about installation of a synchronization mechanism and a position detection mechanism. Explanatory drawing about the lifting operation of a lifting device. Explanatory drawing of the synchronization mechanism with respect to the elevating operation of an elevating device. Explanatory drawing of the arrangement position of the elevating device in a medical clinic.

Hereinafter, the medical medical treatment device 900 provided with the elevating device 1 and the elevating device 1 will be described with reference to FIGS. 1 to 14.
FIG. 1 shows a schematic side view of the medical medical care device 900, and FIG. 2 shows a schematic perspective view of the elevating device 1 provided in the medical medical care device 900 as viewed from the upper right front. Here, in FIG. 1, the vertical direction is the height direction H, and the horizontal direction is the longitudinal direction L. The longitudinal direction L refers to the axial direction of the patient mounted on the medical medical device 900 following the backrest 912 and the leg rest 914 from the headrest 913 of the medical medical device 900.

Further, in FIG. 2, the vertical direction is defined as the height direction H in combination with FIG. 1, and the direction from the left front to the right back is defined as the longitudinal direction L in FIG. Then, the direction from the front right to the back left, that is, the direction orthogonal to the longitudinal direction L and the height direction H of the medical medical device 900 is defined as the width direction W of the medical medical device 900.

Further, in FIG. 2, the upper side in the height direction H is the + H side, the lower height direction is the −H side, the left front side in the longitudinal direction L is the + L side, the right back side is the −L side, and the right front side in the width direction W is. The + W side and the left back side are the -W side.

FIG. 3 shows an explanatory view of a shaft portion 10 that constitutes the elevating device 1 and functions as a rotation blocking member. Specifically, FIG. 3 (a) shows a schematic perspective view of the shaft portion 10 viewed from the upper left, FIG. 3 (b) shows a plan view of the shaft portion 10, and FIG. 3 (c) shows the fixed shaft 12 and the fixed shaft portion 10. It is a top view for showing the manufacturing method of the moving shaft 13. In FIG. 3B, the seat support portion 14 is shown by a dotted line to be in a transparent state, and the planar shape of the moving shaft 13 is clearly shown.
FIG. 4 shows an explanatory view of the hydraulic drive unit 20, and in detail, FIG. 4 (a) shows a schematic perspective view of the hydraulic drive unit 20 as viewed from the upper left back, and FIG. 4 (b) shows a hydraulic drive system. A schematic perspective view of a state in which the piston rod 32 is extruded from the cylinder 31 of the cylinder 30 is shown.

FIG. 5 shows a schematic perspective view of an elevating member 40 that elevates and descends along a fixed shaft 12 in the elevating device 1 shown in FIG. 2, and FIG. 6 shows an explanatory view showing a configuration of the elevating member 40. Specifically, FIG. 5A shows a schematic perspective view of the elevating member 40 viewed from the upper right front, and FIG. 5B shows a schematic perspective view of the elevating member 40 viewed from the upper left back. 6 (a) shows a side view of the elevating member 40 as viewed from the + L side, and FIG. 6 (b) shows a plan view of the elevating member 40.

FIG. 7 shows an explanatory view of the bearing 50 and the support shaft 60. Specifically, FIGS. 7 (a) and 7 (b) show the elevating member in FIG. 6 (a) with the support shaft 60 taken out. 40A cross-sectional view and BB cross-sectional view are shown, FIG. 7 (c) shows a side view of the support shaft 62 with a moving mechanism, and FIGS. 7 (d) and 7 (e) are shown in FIG. 7 (e). The CC sectional view and the DD sectional view in c) are shown. FIG. 8 shows an explanatory diagram of the configuration of the synchronization device 70 and the position detector 80. Specifically, FIG. 8A shows a schematic perspective view of the synchronization device 70 and the position detector 80, and FIG. 8B shows a side view of the synchronization device 70 as viewed from the + L side.

FIG. 9 shows an exploded schematic perspective view of the elevating device 1 for explaining the assembly of each configuration of the elevating device 1, and FIG. 10 shows the bearing 50 for surely contacting the fixed shaft side surface portion 121. An explanatory diagram is shown. Specifically, FIG. 10A shows a plan view of the elevating device 1 in a state where the bearing 50 is in contact with the fixed shaft 12, and FIG. 10B shows a sectional view taken along line EE in FIG. 10A. 10 (c) shows an enlarged cross-sectional view of the bearing 50 in a state where it is not in contact with the fixed shaft 12, and FIG. 10 (d) is an enlarged cross-sectional view of the bearing 50 in a state where it is in contact with the fixed shaft 12. Shown. In FIG. 10, in order to clarify the positional relationship between the bearing 50 and the fixed shaft 12, the configurations other than the base 11, the fixed shaft 12, the bearing 50, and the support shaft 60 are not shown.

FIG. 11 shows a schematic perspective view of the elevating device 1 for explaining the assembly of the synchronization device 70 and the position detector 80 with respect to the elevating device 1, and FIG. 12 shows the + L side and the + L side for explaining the elevating operation of the elevating device 1. The side view of the lifting device 1 viewed from the −L side is schematically shown. Specifically, FIGS. 12 (a1) and 12 (a2) show side views of the elevating device 1 in a state where the hydraulic drive unit 20 is contracted, as viewed from the + L side and the −L side. FIG. 12 (b2) shows side views of the elevating device 1 in the elevating state as viewed from the + L side and the −L side, and FIGS. 12 (c1) and 12 (c2) show the state in which the hydraulic drive unit 20 is fully extended. The side view of the lifting device 1 seen from the + L side and the −L side is shown.

FIG. 13 shows an explanatory view showing the operation of the synchronous device 70 in the lifting operation of the lifting device 1. Specifically, FIG. 13A is a side view of the lifting device 1 and the synchronous device 70 in a state where the hydraulic drive unit 20 is contracted. 13 (b) shows a side view of the elevating device 1 and the synchronous device 70 during elevating, and FIG. 13 (c) shows a side view of the elevating device 1 and the synchronous device 70 in the elevating state. FIG. 14 shows a plan view showing the arrangement relationship of the elevating device 1 in the medical clinic 910.

First, the overall picture of the medical medical device 900 will be described.
As shown in FIG. 1, the medical medical device 900 includes a medical medical table 910 that supports a patient, an elevating base 920 provided at the lower part of the medical medical table 910, an elevating base of the medical medical table 910, and the like. It is composed of a foot controller 930 to be operated, a basin 940, and a lighting support unit 950 equipped with a surgical light and a microscope for examining the oral cavity.

The medical clinic 910 has a seat 911 on which the patient sits, a backrest 912 that can be tilted with respect to the seat 911, a headrest 913 provided at the + L side tip of the backrest 912, and the opposite side of the headrest 913. It is composed of a leg rest 914 that tilts with respect to the seat 911 provided on the (-L side).

The elevating base 920 is an elevating mechanism capable of elevating and elevating the medical medical care table 910 by the practitioner stepping on the foot controller 930, and the elevating device 1 is incorporated therein. In addition to the elevating device 1, various devices are installed inside the elevating base 920, but the description thereof will be omitted here.

As shown in FIG. 2, the elevating device 1 is formed in a substantially rectangular parallelepiped shape that is long in the height direction H as a whole, and has a shaft portion 10 as a base and a hydraulic drive unit arranged along the width direction W. It is composed of 20, an elevating member 40 that moves up and down along the shaft portion 10, a synchronization device 70, and a position detector 80.

As shown in FIG. 3, the shaft portion 10 constituting the elevating device 1 includes a flat plate-shaped base 11 serving as a base when the elevating device 1 is arranged, and a fixed shaft 12 fixed to the base. It is composed of a moving shaft 13 erected in parallel with the fixed shaft in the width direction W, and a seat support portion 14 fixed to the upper end of the moving shaft 13.

As shown in FIGS. 3A and 3B, the base 11 is a rectangular flat plate that is longer in the longitudinal direction L than in the width direction W, and the fixed shaft 12 is fixed to a substantially central portion. It has a fixing part for a fixed shaft (not shown). Further, a moving shaft arrangement portion 111 that is slightly recessed in an arc shape is provided at the + W side end portion of the fixed shaft fixing portion, and a hydraulic drive unit 20A described later is provided at the −L side central portion of the base 11. A first cylinder arrangement portion 112 to be arranged is provided.
The first cylinder arranging portion 112 is a through hole penetrating in the plate thickness direction of the base 11, and has an arc-shaped opening that opens obliquely downward in a plan view.

The fixed shaft 12 is a substantially square columnar body having a height l fixed to a fixed shaft fixing portion provided on the base 11, and as shown in FIGS. 3 (a) and 3 (b), the fixed shaft 12 is a fixed shaft. The outer peripheral surface of the 12 has a configuration in which the fixed shaft side chamfering portions 121 chamfered along the height direction H in the circumferential direction are arranged at four positions at equal intervals.

As shown in FIG. 3C, such a fixed shaft 12 has an outer peripheral surface of a solid cylinder 12x having a height l, one side shorter than the diameter of the bottom surface of the cylinder 12x, and a diagonal line of the cylinder. At the positions of each side of the square 12s longer than the diameter of the bottom surface of the 12x, the arc portion 12k is chamfered along the height direction H to form the fixed shaft side chamfer portion 121 exhibiting a flat surface portion. As a processing method for forming the fixed shaft side surface portion 121, cutting, polishing, forging, grinding, heading, or the like can be used. Further, the fixed shaft side surface portion 121 is hardened to improve the hardness and improve the wear resistance, tensile strength, fatigue strength and the like.

Although the fixed shaft side surface portion 121 is formed by the above-mentioned method in the present embodiment, it is not always necessary to use this method. For example, even if the corner portion of the square pillar is formed by cutting the corner portion into an arc shape. Good. Further, it is not necessary to quench the fixed shaft side surface portion 121.

The moving shaft 13 is a columnar body parallel to the fixed shaft 12 along the width direction W, and has exactly the same shape as the fixed shaft 12. That is, the moving shaft 13 is formed with a moving shaft side surface portion 131.
Here, the moving shaft side surface portion 131 and the fixed shaft side surface portion 121 are arranged so as to intersect each other by 45 degrees. That is, the fixed shaft side surface portion 121 and the moving shaft side surface portion 131 do not face each other (see FIG. 3B).

The seat support portion 14 corresponding to the patient support portion is a flat plate-shaped support plate that connects and fixes the seat seat 911 and is connected to the upper end surface of the moving shaft 13.
The seat support portion 14 extends in the −W direction from the −L side convex home base type flat plate 141 and the −W side end portion of the + L side portion of the home base type flat plate 141 in a plan view. It is a single plate composed of a square plate 142 having a square shape.

One side of the square plate 142 is about half the length of one side of the home base type flat plate 141. Further, the −L side joint portion between the home base type flat plate 141 and the square plate 142 is composed of a fixed shaft avoidance portion 143 formed in an arc shape having substantially the same diameter as the fixed shaft 12, and the −L side of the home base type flat plate 141. A piston fixing hole 144 for bolting to the piston side connecting portion 321B provided at the upper end of the piston rod 32, which will be described later, is provided in the central portion on the tip side on the L side.

As shown in FIG. 3A, the shaft portion 10 having such a configuration has a fixed shaft 12 fixed to the base 11 and a moving shaft 13 fixing the seat support portion 14 to the upper end in the width direction W. They are arranged in parallel along. The upper end portion of the fixed shaft 12 is arranged along the fixed shaft avoidance portion 143, and the lower end portion of the moving shaft 13 is arranged along the moving shaft arrangement portion 111.

As shown in FIG. 4, the hydraulic drive unit 20 arranged along the width direction W with respect to the shaft portion 10 is arranged on the −W side of two hydraulic cylinders 30 arranged in parallel along the width direction W. The hydraulic cylinder 30A and the hydraulic cylinder 30B arranged on the + W side), the flexible connecting pipe 21 for connecting the hydraulic cylinders 30A and 30B, the pump tube 22 for connecting to the connecting pipe 21, and the pump tube 22. It is composed of a hydraulic pump 23 connected to the above.

The hydraulic cylinder 30 includes a cylindrical cylinder 31, a piston rod 32 housed inside the cylinder 31, and a supply port 33 that supplies lifting oil to the inside of the cylinder 31 on the lower end side of the cylinder 31. There is.
The cylinder 31 is a cylindrical cylinder case that can accommodate the piston rod 32 and is slightly longer than the height l. Inside, a tank for lifting oil that is refueled and drained through the supply port 33. (Not shown) is provided.

The piston rod 32 is a cylindrical body having a diameter smaller than that of the cylinder 31 and a height l, and a piston-side connecting portion 321 for connecting to another member is provided at the upper end portion of the piston rod 32.
The supply port 33 is a refueling port for supplying or draining lifting oil from a hydraulic pump to a tank provided inside the cylinder 31.

The two hydraulic cylinders 30A and 30B arranged in parallel in this way are connected via a connecting pipe 21 connected to the supply port 33, and a pump tube 22 connected to the supply port 33A provided in the hydraulic cylinder 30A is provided. It is connected to one hydraulic pump 23 via. The hydraulic pump 23 is connected to the foot controller 930. That is, the hydraulic pump 23 can be controlled by stepping on the foot controller 930.

As described above, in the hydraulic drive unit 20, the lifting oil is supplied or drained through the supply port 33 connected to the hydraulic pump 23 by the stepping operation of the foot controller 930, and the cylinder 31 is supplied with the hydraulic pressure of the lifting oil. The piston rod 32 housed in the above can be raised and lowered.

Since the hydraulic cylinders 30A and 30B are connected to one hydraulic pump 23, both the hydraulic cylinder 30A and the hydraulic cylinder 30B can be controlled at the same time by controlling one hydraulic pump 23.

As shown in FIGS. 5 to 7, in the elevating member 40 corresponding to the connected elevating member, the octagonal columnar fixed shaft side elevating portion 41 and the moving shaft side elevating portion 46 formed in a substantially octagonal shape in a plan view are integrated. It is configured by being connected to. The fixed shaft side elevating portion 41 and the moving shaft side elevating portion 46 are arranged in parallel along the width direction W and are displaced in the height direction H, that is, the moving shaft side elevating portion 46 is located above the elevating member 40. However, the fixed shaft side elevating part 41 is connected and arranged at the lower part, and eight bearings 50 are assembled to the fixed shaft side elevating part 41 and the moving shaft side elevating part 46 via the support shaft 60, respectively. Has been done.

Hereinafter, the elevating member 40, the bearing 50, and the support shaft 60 will be described in detail with reference to FIGS. 5 to 7.
The fixed shaft side elevating part 41, which is arranged below the moving shaft side elevating part 46, has a substantially regular octagonal bottom surface and a substantially regular octagonal pillar having a height of about half (height l / 2) of the fixed shaft 12. In the central portion thereof, a fixed shaft guided portion 411 formed of a cylindrical through hole having a diameter substantially the same as that of the cylindrical body 12x is provided along the height direction H.

Further, among the outer peripheral surfaces forming the fixed shaft side elevating portion 41, the surface inclined by 45 degrees with respect to the longitudinal direction L (hereinafter, referred to as “first odd outer peripheral surface 412”) has a fixed shaft guided portion. Two bearing assembly portions 42 penetrating toward 411 are provided side by side along the height direction H (see FIG. 5). In other words, the fixed shaft side elevating portion 41 is penetrated toward the fixed shaft guided portion 411, and two bearing assembly portions 42 arranged in parallel in the height direction H are provided on the outer circumference of the fixed shaft side elevating portion 41. Four are provided at equal intervals in the direction.
The bearing assembly portion 42 is a through hole through which a part of the first odd outer peripheral surface 412 is penetrated toward the fixed shaft guided portion 411, and is a space portion for assembling the bearing 50 described later.

On the other hand, the first even outer peripheral surface 413 (the surface orthogonal to the longitudinal direction L or the width direction W) in which the bearing assembly portion 42 is not provided penetrates along the adjacent first odd outer peripheral surface 412. The number of through holes of the support shaft fixing holes 43 is provided in the number corresponding to the bearing assembly portion 42. That is, on the first odd outer peripheral surface 412, two support shaft fixing holes 43 penetrating in a direction inclined by 45 degrees with respect to the longitudinal direction L are formed side by side along the height direction (FIG. 5). And FIG. 7 (b)).

Further, a first cylinder fixing auxiliary portion 44 is formed on the + W side on the first even outer peripheral surface 413a formed on the −L side of the first even outer peripheral surface 413 forming the fixed shaft side elevating portion 41. A fixed shaft guide auxiliary portion 45 is provided on the first even outer peripheral surface 413b, respectively (see FIGS. 5 (a) and 5 (b)).

As shown in FIG. 5B, the first cylinder fixing auxiliary portion 44 is formed by recessing the first even outer peripheral surface 413a toward the fixed shaft guided portion 411.
As shown in FIG. 5A, the fixed shaft guide auxiliary portion 45 is formed from the auxiliary arc surface 451 recessed in an arc shape having the same diameter as the cylindrical body 12x and the −L side end portion of the first even outer peripheral surface 413b. It is composed of a first protruding wall 452 that protrudes in the + W direction.

Like the fixed shaft side elevating part 41, the moving shaft side elevating part 46 arranged above the fixed shaft side elevating part 41 has a substantially regular octagonal bottom surface and is about half the height of the moving shaft 13 (height). It is a substantially regular octagonal prism of l / 2), and a moving shaft guide portion 461, which is a through hole having substantially the same diameter as the cylinder 12x, is provided along the height direction H in the central portion.

Further, among the outer peripheral surfaces forming the moving shaft side elevating portion 46, the moving shaft guide portion 461 is formed on a surface inclined by 45 degrees with respect to the longitudinal direction L (hereinafter, referred to as “second odd outer peripheral surface 462”). Two bearing assembly portions 42 penetrating toward the surface are provided side by side in the height direction H (see FIGS. 5 and 6). In other words, the moving shaft side elevating part 46 is provided with four bearing assembly parts 42 penetrating toward the moving shaft guide part 461 at equal intervals in the outer peripheral direction, and two sets are arranged in parallel in the height direction H. It is provided.

On the other hand, the second even outer peripheral surface 463 (the surface orthogonal to the longitudinal direction L or the width direction W) in which the bearing assembly portion 42 is not provided penetrates along the adjacent second odd outer peripheral surface 462. The number of through holes of the support shaft fixing holes 43 is provided in the number corresponding to the bearing assembly portion 42. That is, on the second odd outer peripheral surface 462, two support shaft fixing holes 43 penetrating in a direction inclined by 45 degrees with respect to the longitudinal direction L are formed along the height direction H (FIG. 6). 5 and FIGS. 6 (a) and 7 (a)).

Further, of the second even outer peripheral surface 463, the second even outer peripheral surface 463a formed on the −L side is provided with a second cylinder fixing portion 47 for fixing the hydraulic cylinder 30B.
More specifically, as shown in FIGS. 5 (b) and 6 (b), the second cylinder fixing portion 47 is a second cylinder in which the second even outer peripheral surface 463a formed on the −L side is recessed inward. It is a concave recess composed of a recess 471 and a pair of second protruding walls 472 protruding in the −L direction from the W-side end in the width direction of the second even outer peripheral surface 463a, and is a concave recess of the second protruding wall 472. A cylinder fixing hole 473 is provided on the wall surface for bolting the hydraulic cylinder 30B.

Further, a first cylinder connecting portion 48 projecting to the −W side is formed on the upper portion of the second even outer peripheral surface 463a provided on the −L side of the second even outer peripheral surface 463.
The first cylinder connecting portion 48 is a plate-shaped first cylinder fixing plate 481 formed flush with the upper end surface of the moving shaft side elevating portion 46, and downward from the + L side end portion of the first cylinder fixing plate 481. It is composed of the lower first cylinder auxiliary surface 482 (see FIGS. 5 (b) and 6 (b)), and the piston side connection portion 321A of the hydraulic cylinder 30A is attached to the lower end surface of the first cylinder fixing plate 481. A first rod fixing portion for fixing is provided (not shown). The lower end portion of the first cylinder auxiliary surface 482 is connected to the first even outer peripheral surface 413a and is flush with each other.

Further, a fixed shaft movement assisting portion 49 is formed on the second even outer peripheral surface 463b formed on the −W side of the second even outer peripheral surface 463.
More specifically, the fixed shaft movement assisting portion 49 is formed from an arc-shaped recess 491 in which the second odd outer peripheral surface 462b is recessed in an arc shape having substantially the same diameter as the cylindrical body 12x, and the −L side end portion of the arc-shaped recess 491. It is composed of a guided first auxiliary wall 492 protruding in the −W direction and a guided second auxiliary wall 493 protruding in the −W direction from the + L side end of the arcuate recess 491.
The guided first auxiliary wall 492 is the same as the first cylinder auxiliary surface 482, and the lower end of the guided second auxiliary wall 493 is the same as the first cylinder auxiliary surface 482, which is the first even outer peripheral surface 413a. It is integrally configured with the upper end (see FIG. 5B).

The bearing assembly portion 42 formed on the elevating member 40 (fixed shaft side elevating portion 41 and moving shaft side elevating portion 46) having such a configuration has a rotating surface slightly inside the fixed shaft guided portion 411. A protruding bearing 50 is arranged, and the bearing 50 is assembled to the elevating member 40 by fitting the support shaft 60 that penetrates the inner peripheral surface of the bearing 50 into the support shaft fixing hole 43 (see FIG. 7). ..

As shown in FIG. 7, the support shaft fixing hole 43 has a columnar first through hole 431 that horizontally penetrates the first odd outer peripheral surface 412a and the second odd outer peripheral surface 462a formed on the −L side. , The first odd outer peripheral surface 412b formed on the + L side and the substantially columnar second through hole 432 penetrating the second odd outer peripheral surface 462b in the horizontal direction. A simple support shaft 61, which will be described later, is inserted through the first through hole 431, and a support shaft 62 with a moving mechanism, which will be described later, is inserted through the second through hole 432.

The bearing 50 is composed of an annular outer ring forming a rotating surface, an annularly formed inner ring having the same rotation center as the outer ring, and a spherical rotating body provided between the outer ring and the inner ring (not shown). ), So-called rotary ball bearing.
The inner peripheral surface of the bearing 50 is formed to have substantially the same diameter as the support shaft fixing hole 43.

The support shaft 60 is a support rod that penetrates the inner peripheral surface of the bearing 50, and penetrates the first through hole 431 that penetrates the first odd outer peripheral surface 412a and the second odd outer peripheral surface 462a formed on the −L side. The bearing 50 is passed through a simple cylindrical support shaft 61 for supporting the bearing 50 and a second through hole 432 provided on the first even outer peripheral surface 413b and the second even outer peripheral surface 463b formed on the + L side. It is composed of a support shaft 62 with a substantially columnar moving mechanism that supports the above.

The simple support shaft 61 has a slightly larger diameter than the simple support shaft main body 611, which is a cylindrical body having the same diameter as the bearing 50, and the simple support shaft main body 611 provided on one end side end surface of the simple support shaft main body 611. It is composed of a part 612.

On the other hand, as shown in FIG. 7C, the support shaft 62 with a moving mechanism is fitted with a substantially columnar support shaft insertion portion 621 formed on one end side and a columnar bearing arranged in the central portion. The portion 622 and the substantially cylindrical support shaft fixing portion 623 formed on the other end side are integrally formed.

The support shaft insertion portion 621 is a cylindrical body having a diameter slightly smaller than that of the bearing 50, and has a tapered end on one end and a fixing bolt 625 attached to the end on one end. The fixing bolt 625 is bolted to a bolt hole provided at one end side of the support shaft insertion portion 621 and can be removed (not shown).
The bearing fitting portion 622 is a cylindrical body having the same diameter as the inner peripheral surface of the bearing 50, and the other end side is integrally connected to the support shaft fixing portion 623.

The support shaft fixing portion 623 is a cylindrical body having a larger diameter than the bearing fitting portion 622 and having a recess in the inner diameter direction in the central portion, and the end face on the other end side is rotated and adjusted by using a screwdriver. The cross groove 624 is provided, and the bearing 50 fitted with the bearing fitting portion 622 is rotated by turning the support shaft 62 with a moving mechanism around the central axis m of the support shaft fixing hole 43 with a driver. be able to.
The cross groove 624 does not have to be for using a screwdriver, and may be a hexagonal hole for fitting a hexagon wrench.

FIG. 7 (d) is a cross-sectional view taken along the line CC of the support shaft fixing portion 623 of the support shaft 62 with a moving mechanism, and FIG. 7 (e) is a bearing fitting portion of the support shaft 62 with a moving mechanism. A cross-sectional view taken along the line DD of 622 is shown.
As shown in FIGS. 7 (c), 7 (d), and 7 (e), the support shaft 62 with a moving mechanism configured in this way includes a rotating shaft c1 having a circular cross section of the bearing fitting portion 622. The support shaft insertion portion 621 and the support shaft fixing portion 623 are not arranged on the same line as the central axis m (axis center), and are slightly eccentric upward. That is, the rotation shaft of the bearing 50 is slightly different from the axial direction of the support shaft insertion portion 621 and the support shaft fixing portion 623.

Therefore, by turning the support shaft 62 with the moving mechanism around the central axis m of the support shaft fixing hole 43, the bearing 50 can be adjusted in the direction of approaching or separating from the fixed shaft 12. .. The details of the bearing movement adjustment mechanism will be described later.

As shown in FIG. 8, the synchronization device 70 provided at the end on the −W side of the elevating device 1 is fixed to the plate-shaped synchronization base 71 fixed to the elevating member 40 and the base 11. The reference portion 72, the elevating portion 73 fixed to the seat support portion 14, the first gear 74 rotatably fixed to the upper part of the synchronous base 71, and the lower part of the synchronous base 71 rotatably fixed. The second gear 75, the first chain 76 having one end fixed to the reference portion 72 and meshing with the first gear 74, and the first chain 76 having one end fixed to the elevating portion 73 and meshing with the second gear 75. It is composed of a second chain 77.

As shown in FIG. 8A, the synchronization base 71 is a plate-like body provided along the height direction H and the width direction W, via the synchronization base fixing portion 71a provided on the upper portion on the −W side. It is fixed to the elevating member 40.

The reference portion 72 fixed to the base 11 is a plate-like body having an L-shape inverted upside down as shown in FIGS. 8 (a) and 8 (b), and has a first upper portion as described above. One end side of one chain 76 is fixed. Since the reference portion 72 is fixed to the base 11, it is indirectly fixed to the fixed shaft 12.

The elevating part 73 is a plate-like body having an L-shape inverted left and right, and one end side of the second chain 77 is fixed to the lower part of the elevating part 73. The fixing portion for fixing the elevating portion 73 to the seat support portion 14 is not shown.

The first gear 74 and the second gear 75 are gears that are rotatable about the direction along the longitudinal direction L as a rotation axis and are fixed to the synchronous base 71, and the first chain 76 and the second chain 77 are respectively. It is in mesh. The first gear 74 and the second gear 75 are arranged at predetermined intervals along the height direction H.

The first chain 76 is a chain that is one size longer than the distance between the first gear 74 and the second gear 75, meshes with the upper portion of the first gear 74, and has one end side of the reference portion 72 and the other end side of the elevating portion 73. It is fixed to.

On the other hand, the second chain 77 is a chain having substantially the same length as the first chain 76, and is meshed with the lower part of the second gear 75, and one end side is fixed to the elevating part 73 and the other end side is fixed to the reference part 72. .. That is, the first chain 76 and the second chain 77 are fixed to the reference portion 72 and the elevating portion 73, and are formed in a ring shape.

As shown in FIG. 8A, the position detector 80 for detecting the position of the elevating member 40 detects a plate-shaped position protruding from the −L side end surface of the synchronous base 71 fixed to the elevating member 40 to the + W side. The base 81, the rack 82 provided in the central portion of the position detection base 81, the pinion 83 that meshes with the rack 82 and is rotatably fixed to the base 11, and the rotation of the pinion 83 that is axially coupled to the pinion 83. It is composed of a potentiometer 84 fixed to a base 11 for detecting a number.

The assembly of the elevating device 1 configured by combining the above configurations will be briefly described with reference to FIGS. 9 to 11.
First, as shown in FIG. 9, the hydraulic cylinder 30A is arranged in the first cylinder arranging portion 112 along the fixed shaft 12 erected on the base 11 along the height direction H, and is placed in the hydraulic cylinder 30A. On the other hand, the hydraulic cylinder 30B is arranged along the width direction W. At this time, the supply port 33A constituting the hydraulic cylinder 30A is arranged so as to face the + W side from the opening portion of the first cylinder arrangement portion 112.

Next, the elevating member 40 is mounted on the shaft portion 10.
Specifically, in the height direction H, the fixed shaft guided portion 411 faces the fixed shaft 12 so as to be insertable, and the moving shaft side elevating portion 46 follows the width direction W with respect to the fixed shaft side elevating portion 41. The elevating member 40 is arranged in such a manner, and the elevating member 40 is lowered from above so that the fixed shaft guided portion 411 penetrates the fixed shaft 12. The bearing 50 assembled to the fixed shaft side elevating portion 41 faces the fixed shaft side surface taking portion 121.

Similarly, the moving shaft 13 is arranged so that the bearing 50 assembled to the moving shaft side elevating portion 46 faces the moving shaft side surface taking portion 131, and the moving shaft 13 is inserted from above along the moving shaft guide portion 461. To do.

At this time, the hydraulic cylinder 30A is arranged along the support shaft fixing hole 43, and the piston side connecting portion 321A constituting the hydraulic cylinder 30A is provided on the lower surface of the first cylinder fixing plate 481. Facing (not shown). Further, the hydraulic cylinder 30B is arranged along the second cylinder fixing portion 47, and the upper portion of the cylinder 31B is surrounded by the second cylinder fixing portion 47.

In this state, the hydraulic cylinder 30B is bolted to the second cylinder fixing portion 47, and the piston fixing hole 144 of the seat support portion 14 arranged above and the piston side connecting portion 321B are fixed. Further, the piston side connecting portion 321A provided on the upper end surface of the hydraulic cylinder 30A is fixed to the first rod fixing portion (not shown) provided on the lower surface of the first cylinder fixing plate 481 to move up and down with the hydraulic drive unit 20. The member 40 and the member 40 are fixed.

Further, since the bearing 50 assembled to the bearing assembly portion 42 slightly protrudes to the fixed shaft guided portion 411 side or the moving shaft guide portion 461 side, the bearing 50 is attached to the fixed shaft guided portion 411 and the moving shaft guide portion 461. It comes into contact with the inserted fixed shaft side bearing portion 121 and the moving shaft side bearing portion 131 (see FIGS. 10 (a) and 10 (b)).

However, for example, when the fixed shaft 12 is inserted through the fixed shaft guided portion 411 in a state where the elevating member 40 is slightly tilted with respect to the height direction H, the fixed shaft guided portion 411 and the moving shaft guided portion 461 A part of the bearing 50 arranged in the circumferential direction may not come into contact with the fixed shaft side surface portion 121 (see FIG. 10C).

In such a case, as shown in FIG. 10D, the bearing is rotated by rotating the support shaft 62 with a moving mechanism that supports the bearing 50 assembled on the first odd outer peripheral surface 412b and the second odd outer peripheral surface 462b. The rotating shaft c1 of the fitting portion 622 can be moved to the fixed shaft side bearing portion 121 side.

As a result, the bearing 50 can be brought into contact with the fixed shaft side surface portion 121, and the rotating shaft of the bearing 50 can be moved to the fixed shaft guided portion 411 side. As a result, the fixed shaft side surface portion 121 and the bearing 50 can be brought into contact with each other.

If the bearing 50 is pressing the fixed shaft side surface portion 121, the driver rotates the support shaft 62 with a moving mechanism to rotate the rotating shaft c1 of the bearing fitting portion 622 to the fixed shaft side surface removing portion. By moving the bearing 50 in the direction opposite to the 121 side, the contact between the bearing 50 and the fixed shaft side surface portion 121 can be loosened.

As shown in FIG. 11, the synchronization device 70 and the position detector 80 are assembled from the + L side to the shaft portion 10 and the hydraulic drive portion 20 fixed to the elevating member 40 in this way, and the synchronization base 71 and the synchronization base 71. The elevating member 40 is fixed. At the same time, by fixing the reference portion 72 to the base 11 and the elevating portion 73 to the seat support portion 14, the synchronization device with respect to the elevating member 40 to which the shaft portion 10 and the hydraulic drive portion 20 are fixed. The 70 and the position detector 80 can be assembled.

The elevating device 1 configured in this way can elevate and elevate the seat support portion 14 that supports the patient along the height direction H by the practitioner stepping on the foot controller 930. Hereinafter, the elevating operation of the elevating device 1 will be briefly described with reference to FIG.

When the seat support portion 14 is arranged at the lowest position (see FIG. 12 (a1)), that is, when the hydraulic cylinder 30A and the hydraulic cylinder 30B are in a contracted state (see FIG. 12 (a2)), the practitioner When the foot controller 930 is stepped on, lifting oil is supplied to the hydraulic cylinders 30A and 30B via the pump tube 22, the oil pressure in the tank rises, and the piston rod 32A and the piston rod 32B move along the height direction H. It will go up and down (Fig. 12 (b2)). Since the hydraulic cylinder 30A and the hydraulic cylinder 30B having the same shape are connected to one hydraulic pump 23 via the connecting pipe 21, the same pressure acts inside and exerts the same thrust. To do. Therefore, both the piston rod 32A and the piston rod 32B extend upward by the same stroke.

As a result, the first cylinder connecting portion 48 fixed to the upper end of the piston rod 32A is lifted upward, and the elevating member 40 rises along the fixed shaft 12. Further, since the seat support portion 14 fixed to the piston rod 32B constituting the hydraulic cylinder 30B fixed to the elevating member 40 is also lifted upward, the moving shaft 13 rises along the moving shaft guide portion 461. (See FIGS. 12 (b1) and 12 (b2)).

Then, when the practitioner further steps on the foot controller 930, the piston rod 32A and the piston rod 32B are extended by the maximum stroke (see FIG. 12 (c2)). As a result, the upper end surface of the fixed shaft side elevating portion 41 rises to a position substantially flush with the upper end portion of the fixed shaft 12, and the lower end surface of the moving shaft 13 and the lower end surface of the moving shaft side elevating portion 46. The moving shaft 13 rises along the moving shaft guide portion 461 to a position where is substantially flush with each other. That is, the seat support portion 14 is arranged at the highest position.

In the elevating device 1 configured in this way, a fixed shaft 12 fixed to the base 11 and a seat support portion 14 for supporting the patient are connected to the upper end portion, and the movement is arranged in parallel with the fixed shaft 12. An elevating member 40 that connects the shaft 13, the fixed shaft 12 and the moving shaft 13, and can be moved up and down along the fixed shaft 12, a hydraulic cylinder 30A that raises and lowers the elevating member 40 with respect to the fixed shaft 12, and a moving shaft. A hydraulic cylinder 30B that raises and lowers 13 with respect to the elevating member 40 is provided, and the elevating member 40 fits on the outer peripheral surface of the fixed shaft 12 and is guided in the vertical direction along the fixed shaft 12. The seat support portion 14 is stably moved up and down by providing the guide portion 411 and the moving shaft guide portion 461 that is fitted to the outer peripheral surface of the moving shaft 13 to guide the ascending / descending direction of the moving shaft 13. be able to.

More specifically, the elevating member 40 is fixed to the fixed shaft 12 so as to be able to move up and down by fitting the fixed shaft guided portion 411 to the outer peripheral surface of the fixed shaft 12 fixed to the base 11. Therefore, the elevating member 40 can be stably moved up and down with respect to the fixed shaft 12. On the other hand, in the moving shaft side elevating portion 46 provided on the elevating member 40, since the moving shaft 13 is fitted so as to be able to move up and down, even if an external force acts on the moving shaft 13, as described above. Since it is fitted to the moving shaft guide portion 461 provided in the elevating member 40 capable of stably ascending and descending, the fixed shaft 12 for fixing the elevating member 40 is concerned even when an external force acts on the moving shaft 13. Since the external force is received, the seat support portion 14 connected to the upper end of the moving shaft 13 can be stably moved up and down in accordance with the raising and lowering of the hydraulic cylinder 30B.

Further, by using the same hydraulic cylinder 30 for the hydraulic cylinder 30A and the hydraulic cylinder 30B, the stroke of each hydraulic cylinder 30 can be halved as compared with the case where one hydraulic cylinder 30 is used. That is, the height of the lifting device 1 in the state where the hydraulic cylinder 30A and the hydraulic cylinder 30B are contracted can be halved as compared with the case where the hydraulic cylinder 30 is one, and the height of the hydraulic cylinder 30 is compared with the case where the hydraulic cylinder 30 is one. The sizes of 30A and the hydraulic cylinder 30B can be reduced in the vertical direction.

Furthermore, as described above, since the strokes of the hydraulic cylinders 30A and the hydraulic cylinders 30B can be halved as compared with the case where there is only one hydraulic cylinder 30, even when a force acts in the direction intersecting the fixed shaft 12. , The torque acting on the hydraulic cylinder 30A and the hydraulic cylinder 30B can be reduced. Therefore, the member strength of each hydraulic cylinder 30 can be reduced. From this, it is possible to increase the choices of members used for the hydraulic cylinder 30A and the hydraulic cylinder 30B, and it is possible to reduce the weight and cost.

Further, by providing the hydraulic pump 23 for driving the hydraulic cylinder 30A and the hydraulic cylinder 30B by applying a hydraulic pressure, it is possible to increase the output and the responsiveness as compared with the case where an air pressure or the like is applied. That is, the whole can be miniaturized by using a hydraulic cylinder. Further, since the elevating member 40 can be smoothly moved up and down with less vibration, the elevating member 40 can be moved up and down smoothly.

Further, the hydraulic cylinder 30A and the hydraulic cylinder 30B are composed of hydraulic cylinders having the same thrust that exerts the same thrust for the same pressure, and one hydraulic pump 23 for the hydraulic cylinder 30A and the hydraulic cylinder 30B. By applying hydraulic pressure to both the hydraulic cylinder 30A and the hydraulic cylinder 30B, the hydraulic cylinder 30A and the hydraulic cylinder 30B can be easily controlled, and both the hydraulic cylinder 30A and the hydraulic cylinder 30B can be driven at the same time. It is possible to prevent the load from being significantly biased to one side.

Further, when the hydraulic pipe connected to the hydraulic pump 23 is branched and connected to the hydraulic cylinder 30A and the hydraulic cylinder 30B, the height of the seat support portion 14 can be kept constant regardless of the position of the elevating member 40. It is possible to ensure the stability of the patient position.

More specifically, for example, when the hydraulic cylinder 30A and the hydraulic cylinder 30B are connected to different hydraulic pumps 23, when the elevating member 40 is unintentionally lowered, that is, when the pressure of the hydraulic cylinder 30A decreases, the seat support The portion 14 is lowered by the lowered distance of the elevating member 40.

On the other hand, when the hydraulic pipe of one hydraulic pump 23 is branched and connected to the hydraulic cylinder 30A and the hydraulic cylinder 30B, the pressure of the hydraulic pump 23 is distributed between the hydraulic cylinder 30A and the hydraulic cylinder 30B. Therefore, when the pressure of the hydraulic cylinder 30A decreases, the pressure of the hydraulic cylinder 30B increases by the amount of the reduced pressure. Therefore, due to the decompression of the hydraulic cylinder 30A, the seat support portion 14 connected to the hydraulic cylinder 30B is raised by the amount of the lowering of the elevating member 40, and the height of the seat support portion 14 can be maintained.

In this way, even if the height of the elevating member 40 changes unintentionally, the height of the seat support portion 14 does not change, so that the patient does not unintentionally ascend or descend, and the treatment position The height can be surely secured.

Further, there is a case where the external force acting on the hydraulic cylinder 30A and the hydraulic cylinder 30B is different by providing the synchronization device 70 that synchronizes the raising and lowering of the elevating member 40 with respect to the fixed shaft 12 and the raising and lowering of the moving shaft 13 with respect to the elevating member 40. However, the hydraulic cylinder 30A and the hydraulic cylinder 30B can be driven at the same time with substantially the same stroke.

Hereinafter, the synchronization device 70 will be described with reference to FIG.
For example, when the hydraulic cylinder 30A and the hydraulic cylinder 30B composed of the same hydraulic cylinder 30 are controlled by the hydraulic pump 23, when the pressure acting on the hydraulic cylinder 30A and the pressure acting on the hydraulic cylinder 30B are different, the hydraulic cylinder The strokes of the 30A and the hydraulic cylinder 30B will be different.

Specifically, in a state where the seat support portion 14 is in the lowest position (see FIG. 13A), pressure is unintentionally applied only to the hydraulic cylinder 30A, and only the elevating member 40 is along the fixed shaft 12. When the reference portion 72 is raised, the reference portion 72 is fixed to the fixed shaft 12, and the synchronization base 71 is fixed to the elevating member 40. Therefore, the synchronization base 71 moves up and down while the reference portion 72 is fixed to the base 11. It will rise together with the member 40 (see FIG. 13B).

That is, the first gear 74 and the second gear 75 fixed to the elevating member 40 are raised, and the first chain 76 whose one end is fixed to the reference portion 72 is pulled in the −H direction, and the first gear is pulled. 74 rotates counterclockwise. As a result, the elevating portion 73 fixed to the other end side of the first chain 76 is pulled in the + H direction and rises (see FIG. 13B). Since the second chain 77 is pulled upward based on the rise of the elevating portion 73, the second gear 75 also rotates counterclockwise.

Here, since the elevating portion 73 is fixed to the seat support portion 14 (moving shaft 13), the seat supporting portion 14 rises as the elevating portion 73 rises, and the piston rod 32B connected to the moving shaft 13 Is pulled upward and driven (see FIG. 13 (c)).

In this case, since the lengths of the first chain 76 and the second chain 77 are constant, the ascending distance of the first gear 74 and the second gear 75 (the ascending distance of the elevating member 40) and the ascending distance of the elevating portion 73 (the ascending distance of the elevating member 40). The ascending distance of the moving shaft 13) becomes equal. Therefore, the stroke amounts of the hydraulic cylinder 30A and the hydraulic cylinder 30B are the same.
With the above configuration, the elevating member 40 can be positioned at a substantially central portion between the base 11 and the seat support portion 14.

In this way, by providing the synchronization device 70, one of the hydraulic cylinders 30 can be pulled up so that the stroke amounts of the hydraulic cylinders 30A and the hydraulic cylinders 30B are the same. As a result, the hydraulic cylinder 30A or the hydraulic cylinder 30B can be driven equally, and it is possible to prevent the durability of only one of the hydraulic cylinder 30A or the hydraulic cylinder 30B from deteriorating.

Furthermore, the synchronization device 70 is fixed to the first gear 74 and the second gear 75 connected to the elevating member 40, one end side is fixed to the fixed shaft 12 side, and the other end side is fixed to the moving shaft 13 side. By configuring the first chain 76 and the second chain 77 that mesh with the gear 74 and the second gear 75, it is easy to raise and lower the elevating member 40 with respect to the fixed shaft 12 and to raise and lower the moving shaft 13 with respect to the elevating member 40. The configuration can be reliably synchronized. Further, as compared with the case where the elevating member 40 with respect to the fixed shaft 12 and the elevating / lowering of the moving shaft 13 with respect to the elevating member 40 are synchronized by using a complicated configuration such as an electronic mechanism, the elevating / lowering is simple and stable. Can be realized.

Further, the fixed shaft 12 and the moving shaft 13 are substantially square columnar bodies having a fixed shaft side surface portion 121 and a moving shaft side surface portion 131 that are chamfered in a plane extending in the four directions on the outer peripheral surface of the cylindrical body. By providing the fixed shaft guided portion 411 and the moving shaft guide portion 461 with a bearing 50 that rolls with respect to the fixed shaft side surface taking portion 121 and the moving shaft side taking portion 131, the patient with respect to the base 11 can be provided. The relative rotation of the supporting seat support portion 14 can be prevented.

More specifically, the elevating member 40 includes a fixed shaft guided portion 411 that fits against the outer peripheral surface of the fixed shaft 12 having the fixed shaft side bearing portion 121 and the moving shaft side bearing portion 131, and the fixed shaft guided portion 411. Since the bearing 50 that rolls with respect to the fixed shaft side surface taking portion 121 and the moving shaft side surface taking portion 131 is provided in the circumferential direction on the inner peripheral surface of the portion 411, an external force acts on the elevating member 40 to fix the portion 411. Even when the elevating member 40 tries to rotate with the shaft 12 as the rotation axis, the bearing 50 interferes with the fixed shaft side surface taking portion 121 and the moving shaft side surface taking portion 131 formed in a plane in the vertical direction. Therefore, the relative rotation of the elevating member 40 can be prevented.

Further, since the elevating member 40 can be moved up and down in the vertical direction by fitting the fixed shaft guided portion 411 to the outer peripheral surface of the fixed shaft 12 fixed to the base 11, for example, the hydraulic cylinder 30 is extended. Even in this state, the fixed shaft 12 does not tilt due to the external force acting on the seat support portion 14, and the elevating member 40 can be moved up and down more stably.

Further, the bearing 50 interferes with the fixed shaft side surface portion 121 and the moving shaft side surface portion 131 to prevent the relative rotation of the elevating member 40, but the bearing 50 interferes with the fixed shaft 12. Even in this state, the bearing 50 rolls with respect to the fixed shaft side surface portion 121 and the moving shaft side surface portion 131, and the elevating member 40 can be smoothly moved up and down.
By fitting the elevating member 40 to the fixed shaft 12 fixed to the base 11 so as to be able to elevate and lower, it is possible to smoothly elevate and lower the elevating member 40 while preventing the relative rotation of the elevating member 40, and to support the seat. The unit 14 can be moved up and down in a stable manner.

Further, the bearings 50 are arranged in a direction in which the bearings 50 are arranged with respect to the fixed shaft 12 or the fixed shaft side surface portion 121 and the moving shaft side surface portion 131 intersect at 45 degrees, and the bearings are vertically arranged. By arranging them at different positions in the directions, the bearing 50 on the fixed shaft 12 side that abuts on the fixed shaft side surface portion 121 on the fixed shaft 12 side and the moving shaft side surface removing portion 131, and the fixed shaft side surface removing portion on the moving shaft 13 side. The bearing 50 on the moving shaft 13 side, which is in contact with 121 and the moving shaft side surface section 131, can be brought close to each other so as not to interfere with each other, the installation area of the lifting device 1 can be further reduced, and a space can be created around the lifting device 1. Can be secured.

Further, the above-mentioned elevating device 1 is provided, the seat support portion 14 is configured to fix the seat seat on which the patient sits, and the hydraulic cylinder 30A and the hydraulic cylinder 30B are arranged along the width direction W of the seat support portion 14. As a result, the elevating device 1 described above can be reduced in the longitudinal direction L of the seat support portion 14, and a space in the depth direction below the seat support portion 14 can be secured. As a result, for example, the practitioner can place the foot in the space and can approach the patient to be treated without taking an unreasonable posture. Therefore, it is possible to take a posture that makes it easy to perform the treatment at a position close to the patient, and it is possible to perform the treatment reliably and smoothly.

The arrangement of the elevating device 1 in the medical medical device 900 will be described in more detail with reference to FIG.
An elevating device 1 is provided below the elevating base 920 of the medical clinic 910. The hydraulic cylinder 30A and the hydraulic cylinder 30B forming the elevating device 1 and the fixed shaft 12 and the moving shaft 13 are arranged along the width direction W, and the hydraulic cylinder 30A and the hydraulic cylinder 30B, the fixed shaft 12 and the moving shaft 13 are arranged. Is arranged along the longitudinal direction L. The fixed shaft 12 and the moving shaft 13 are arranged on the + L side of the hydraulic cylinder 30.

Further, the hydraulic pump 23 is arranged closer to the feet along the longitudinal direction L with respect to the hydraulic cylinder 30A and the hydraulic cylinder 30B. By arranging the hydraulic cylinders 30A and the hydraulic cylinders 30B in this way, the lifting device can be made compact, so that the operator's suspension can be easily moved.

In the correspondence between the configuration of the present invention and the above-described embodiment,
The patient support section corresponds to the seat support section 14,
The connecting elevating member corresponds to the elevating member 40,
The first drive unit corresponds to the hydraulic cylinder 30A and
The second drive unit corresponds to the hydraulic cylinder 30B and
The guided portion corresponds to the fixed shaft guided portion 411, and corresponds to the fixed shaft guided portion 411.
The guide unit corresponds to the moving axis guide unit 461.
The synchronization mechanism corresponds to the synchronization device 70,
The gears correspond to the first gear 74 and the second gear 75,
The cord corresponds to the first chain 76 and the second chain 77,
The chamfered portion corresponds to the fixed shaft side chamfered portion 121 and the moving shaft side chamfered portion 131.
The rolling element corresponds to the bearing 50 and
The seat support corresponds to the seat 911,
The present invention is not limited to the configuration of the above-described embodiment, and many embodiments can be obtained.

For example, in the present embodiment, eight bearing assembly portions 42 are provided, but the number is not necessarily the same, and one bearing assembly portion 42 may be provided at a predetermined location, or four bearing assembly portions 42 may be provided evenly in the circumferential direction. You may.

Further, in the present embodiment, the hydraulic cylinders 30A and 30B are used to move the elevating member 40 up and down in the vertical direction. It may be raised and lowered by electric motor such as a raising and lowering mechanism by combination.

Further, instead of the hydraulic cylinder 30, it may be replaced with an elevating mechanism using an electric motor and a screw shaft. Further, a gear is provided on the side surface portion 121 of the fixed shaft to raise and lower the elevating member 40 by rotating the gear instead of the bearing, and a rack is provided along the fixed shaft 12 to provide a gear (pinion) that meshes with the rack. It may be a gear structure that is rotated by such as.

Further, in the present embodiment, the medical medical device 900 is a dental medical table, but the present invention is not limited to dentistry. For example, an otolaryngological medical table, an ophthalmic medical table, and an obstetrics and gynecology examination. It may be used as a medical clinic such as a table.

Further, the seat support portion 14 does not have to be limited to a configuration in which the backrest 912 is connected to the seat seat 911 that tilts with respect to the seat seat 911, and may be appropriately changed depending on the medical clinic. Specifically, the backrest 912 may be raised and lowered by simply connecting to the seat support portion 14 of a flat and wide seat seat without tilting with respect to the seat seat 911.

In the present embodiment, the moving unit corresponds to a component composed of a moving shaft 13 connecting the seat support portion 14 to the upper end surface and an elevating member 40, but it is not always necessary to have this configuration. For example, the moving shaft 13 may not be included as a configuration, and the seat support portion 14 may be fixed to the elevating member 40. That is, as another embodiment of the present invention, it may be a one-step elevating / lowering device that does not include the moving shaft 13 and the hydraulic cylinder 30B for raising / lowering the moving shaft 13 as a configuration.

Furthermore, in the present embodiment, the fixed shaft 12 and the moving shaft 13 are configured to have a substantially square cross section, but they do not necessarily have to have a substantially square cross section, and have a regular polygonal shape such as an equilateral triangle cross section or a regular pentagon cross section. It may be a polygonal pillar having a triangular shape or more.

However, by forming the fixed shaft 12 and the moving shaft 13 into a regular polygonal shape, the relative rotation of the elevating member 40 can be reliably prevented, and the restriction on the arrangement direction of the elevating member 40 with respect to the arrangement direction of the regular polygonal column is released. be able to.

1 Lifting device 11 Base 12 Fixed shaft 12 x Cylindrical body 121 Fixed shaft side bearing 13 Moving shaft 131 Moving shaft Side bearing 14 Patient support 23 Hydraulic pump 30 Hydraulic cylinder 40 Lifting member 411 Fixed shaft Guided portion 461 Moving shaft Guide 50 Bearing 70 Synchronizer 74 First gear 75 Second gear 76 First chain 77 Second chain 910 Medical clinic 911 Seat seat

Claims (9)

A fixed shaft that extends in the vertical direction and is fixed to the base,
A patient support portion that supports the patient is connected to the upper end portion, and a moving shaft arranged in parallel with the fixed shaft and a moving shaft.
A connecting elevating member that connects the fixed shaft and the moving shaft and can be moved up and down along the fixed shaft.
A first drive unit that raises and lowers the connecting elevating member with respect to the fixed shaft,
A second drive unit that raises and lowers the moving shaft with respect to the connecting elevating member is provided.
The fixed shaft and the moving shaft have the same length in the vertical direction .
The connecting elevating member
A fixed shaft side elevating portion that fits on the outer peripheral surface of the fixed shaft and has a guided portion that is guided in the vertical direction along the fixed shaft and that moves up and down with respect to the fixed shaft.
It has a guide portion that fits on the outer peripheral surface of the moving shaft and guides the elevating direction of the moving shaft, and is integrally connected to the moving shaft side elevating portion arranged in parallel with the fixed shaft side elevating portion. Is composed of
The moving shaft side elevating part and the fixed shaft side elevating part are composed of half the length of the fixed shaft in the vertical direction and are formed.
The moving shaft side elevating part is an elevating device arranged on the upper side in the vertical direction with respect to the fixed shaft side elevating part. The first drive unit and the second drive unit are each composed of a hydraulic cylinder.
The elevating device according to claim 1, wherein a hydraulic pump is provided that drives the hydraulic cylinder by applying flood pressure. The first drive unit and the second drive unit are composed of hydraulic cylinders having the same thrust that exert the same thrust with respect to the same pressure, and also with respect to the first drive unit and the second drive unit. Equipped with one hydraulic pump,
The elevating device according to claim 1, wherein a hydraulic system is applied to both the first drive unit and the second drive unit configured by the hydraulic cylinder. Ascending / descending of the connecting elevating member with respect to the fixed shaft,
The elevating device according to any one of claims 1 to 3, wherein a synchronization mechanism for synchronizing the elevating and lowering of the moving shaft with respect to the connecting elevating member is provided. The synchronization mechanism
The gears provided on the connecting elevating member and
The lifting device according to claim 4, wherein one end side is fixed to the fixed shaft side and the other end side is fixed to the moving shaft side, which is composed of a cord body that meshes with the gear. The fixed shaft and the moving shaft
It is composed of a columnar body having a chamfered portion that is chamfered in a plane extending in the axial direction on the outer peripheral surface of the columnar body.
The elevating device according to any one of claims 1 to 5, wherein the guided portion and the guide portion are provided with a rolling element that rolls with respect to the chamfered portion. The lifting device according to claim 6, wherein the fixed shaft and the moving shaft are formed of a substantially square columnar body having chamfered portions in four directions on the outer peripheral surface of the columnar body. The seventh aspect of claim 7, wherein the rolling element and the chamfered portion are arranged so as to intersect 45 degrees with respect to the arrangement direction of the moving shaft with respect to the fixed shaft, and are arranged at different positions in the vertical direction. lift device. The elevating device according to any one of claims 1 to 8 is provided.
The patient support part
A medical clinic composed of a seat support portion to which a seat on which the patient sits is fixed.

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