JPS6121067Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in an elevating chair (particularly for dental treatment) using a parallel link mechanism.

BACKGROUND ART Elevating chairs in which a seat base is raised and lowered by rotating parallel links have been widely used. The rotation of this link is generally achieved by, for example, extending and retracting the cylinder or rotating the screw shaft with an electric motor, but the biggest feature of the parallel link mechanism is that even if the stroke of the cylinder is limited, the width of the rise and fall of the pedestal can be increased. It is something that can be done. However, since the pedestal is moved up and down by rotating the link as mentioned above, it also has the disadvantage that the pedestal moves back and forth in response to the rotation angle of the link, making it impossible to vertically move up and down. In dental treatment, when a patient is moved up and down using an elevating chair, the doctor also has to move back and forth each time, which is a hassle. On the other hand, as a means of raising and lowering the seat vertically, a method is generally adopted in which the seat is raised and lowered directly using a hydraulic cylinder, but in this case, as mentioned above, there is a limit to the stroke and the width of the rise and fall of the seat is limited. When used as an elevating chair for dental treatment, there was a problem in that the desired height could not be obtained.

The present invention has been devised in view of the above, and the object is to provide a convenient elevating chair that takes full advantage of the advantages of the parallel link mechanism and allows the seat to be vertically moved up and down in a straight line.

To explain the present invention with reference to the drawings, Fig. 1 is a perspective view of a typical embodiment of the invention, Fig. 2 is a side view of the same, Fig. 3 is a vertical sectional view taken along the line of Fig. 1, and Fig. The figure is a longitudinal sectional view corresponding to FIG. 3 of another embodiment. That is, in the present invention, the upper and lower substrates 1 and 2 are connected and maintained in a parallel and horizontal state to each other by at least a pair of parallel links 5 and 6 interposed between the substrates 1 and 2 in a vertically parallel state. The parallel link 5,
6 are rotatable relative to each other within a vertical plane area using one end as a fulcrum, and the above-mentioned substrate 1 or 2 is moved up and down in a horizontal state as a result of the rotational movement of the parallel links 5 and 6. The pins 41, 41 at the fulcrum side ends of the parallel links 5, 6 are pivotally connected to the vertical parallel support plates 4, 4 immovably fixed to the base plate 2, respectively, and the pins 31, 31 at the rotation side ends
are pivotally connected to vertical parallel support plates 3, 3, respectively, which are slidably attached to the base plate 1 in parallel with the rotating surface areas of the parallel links 5, 6, and the base plates 1 of the parallel links 5, 6 are A gear 51 coaxial with the pin 31 is substantially integrated with the link 5 in a non-rotatable state at the rotating end of the side link 5, and support plates 3, 3 are provided on the inner surface of the base plate 1. The rack 11 is fixed parallel to the sliding direction of the supporting plates 3, 3.
A support shaft 33 is installed between them, and a pinion 7 and a gear 8 that are substantially fixed to each other are mounted on the support shaft 33.
is rotatably supported around the axis of the support shaft 33, and the pinion 7 and the gear 51 are meshed with the gear 8 and the rack 11, respectively, whereby the parallel links 5, 6 The drive device 9
When the pins 41, 41 are rotated in a vertical plane using the pins 41, 41 as fulcrums, the gear 51 rotates the pinion 7 by a phase difference corresponding to the rotation angle of the link 5, and the gear 8 interlocking with the pinion 7 changes its number of teeth. meshing and rolling along the rack 11 a distance corresponding to the ratio,
By appropriately determining these tooth ratios, the rotating movement of the parallel links 5, 6 about the pins 41, 41 can linearly move the boards 1 and 2 away from or close to each other in the vertical direction. be. Figures 1 to 3 show an example in which the board 1 is used as a pedestal for a chair seat, and the board 2 is used as a base, in which the board 2 is fixed to the floor (as shown in the attached figure) and the board 1 is moved up and down. do. Needless to say, although not shown in the figure, a chair seat for dental treatment, etc. is placed on this substrate 1. In addition, in the figure, two pairs of upper and lower parallel links 5 and 6 are interposed in parallel between the board 1 and the board 2, and both are connected to pins 41, 41 and pins 31, 31 at the fulcrum side end and the rotation side end. While being fixed, the links 5, 5 and 6, 6 are each reinforced with a reinforcing plate 5.
2 and 61. In order to ensure the stability of the board 1, it is preferable to provide two pairs of parallel links 5 and 6 as shown in the figure, but this is not excluded if the stability of the board 1 can be achieved even with just one pair. do not have. Further, between the support plates 3, 3, the pins 31, 31 are pivotally attached as described above, and a support shaft 33 is installed, and the pinion 7 and the gear 8 are mounted on the support shaft 33.
are coaxially fixed to each other and rotatably supported around the axis of the support shaft 33. This support plate 3 and 3 are parallel 32 ……, which is freely connected to the upper part of the outer surface, is parallel to each other on the opposite inside of the support frame 12 and 12 hanging on the parallel edge of the substrate 1 and the above. Sliding groove 12 marked parallel to rack 11
1 and 121, it is slidably attached to the substrate 1. parallel link 5,
6 and the support plates 3 and 3, the substrate 1
is maintained horizontally (parallel to the substrate 2).

On the other hand, the drive device 9 connects the parallel links 5 and 6 to the pin 4.
1 and 41 as a fulcrum, and a supporting body for supporting the weight on the device and the substrate 1, and is shown as a hydraulic cylinder in the figure. The rod tip of this cylinder grips the pin 31 on the board 1 side and is rotatable relative to the pin 31, and the base side has a universal joint or the like near the support plates 4, 4 on the board 2. Fixed through.

The gear 51 is coaxially fixed to the pin 31 on the board 1 side and is substantially integrated with the link 5 (because the link 5 and the pin 31 are fixed), thereby corresponding to the rotation angle of the link 5. The phase shift difference can be transmitted via the pinion 7 to the gear 8 integrated therewith.

To explain how to raise and lower the lift chair of the present invention based on the above configuration, when the hydraulic cylinder 9, which is the drive device, is operated and the cylinder rod is extended in the state shown by the solid line in FIGS. 2 and 3, Since the pins 41, 41 of the links 5, 6 are pivotally connected to the support plates 4, 4 which are immovably fixed to the base plate 2, the parallel links 5, 6 rotate in the direction of arrow A. The gear 5 that is integrated with this by the rotation of this link 5
1 also apparently rotates in the direction a, causing the pinion 7 to rotate in the direction b by a phase difference corresponding to the rotation angle of the link 5. A gear 8 coaxially integrated with the pinion 7 similarly rotates in the b direction, and since this gear 8 meshes with the rack 11, the base plate 1 is moved to the left in FIG. 3 along with its rotation. Become.
That is, since the substrate 1 is pushed upward and moved to the left by the rotation of the parallel links 5 and 6 in the A direction, the distance between the pins 31 and 41 and the gear 5 are
1. By appropriately selecting the number of teeth of the pinion 7 and gear 8, it is possible to raise the board 1 substantially perpendicularly and linearly to the board 2 (see the chain line in FIG. 3). , when the support plates 3, 3 are fixed to the base plate 1 and mechanisms such as the gear 51, pinion 7, gear 8, rack 11, etc. do not exist (in the case of a conventional parallel link mechanism), the rotation of the parallel links 5, 6 In Fig. 3, the substrate 1 is shifted to the right by the phase difference l in the rotation angle due to its rotation.
In the present invention, the support plates 3, 3 are slidable with respect to the base plate 1, and the above-mentioned mechanisms such as the gear 51, the rack 11, etc. are used to compensate for the rightward deviation l of the support plate 1 by the rotation of the parallel links 5, 6. At the same time, the modification was made to allow the substrate 1 to rise substantially in the vertical direction. In the case of descending, if the rod of the hydraulic cylinder 9 is retracted in the opposite direction from the upstream direction, the substrate 1 will descend vertically.

As mentioned above, in the elevating chair using the parallel links of the present invention, the seat base (substrate 1) rises and falls linearly in the vertical direction, whereas in this type of chair using conventional parallel links, the seat base moves back and forth as it rises and falls. Since it does not have the disadvantage of shifting, especially in dental treatment, the inconvenience of the doctor having to move back and forth every time he or she raises or lowers a patient is eliminated. Furthermore, since the advantages of the parallel link mechanism are utilized as they are, the range of vertical movement can be increased, and together with the above-mentioned advantages, this has the effect of expanding the range of medical treatment available to doctors.

In the illustrated example, a hydraulic cylinder is used as the drive device, but it is not limited to this, and any device that has the function of rotating the parallel links 5 and 6 in the direction of the arrow A (including the opposite direction) may be used. Therefore, a position where the intervening position can be directly connected to the link 5 or 6 and actuated is also possible. However, if the hydraulic cylinder 9 is disposed approximately diagonally to the parallel links 5, 6 as shown in the figure, the distance between the parallel links 5, 6 and the base plate 2 can be simplified and convenient. In addition, the gear 51 does not need to be perfectly circular to the extent that it is functionally acceptable, that is, the gear 51 apparently rotates in the direction of arrow a in FIG. 3 (including vice versa) as the link 5 rotates. Since the rotation range is limited (because the substrate 1 naturally has an upper solstice point and a lower solstice point), if this rotation range is allowed, a fan shape with the pin 31 on the substrate 1 side as the center of curvature is also possible. Furthermore, this gear 51 is the pin 31 in the embodiment.
Although it is substantially integrated with the link 5 by fixing it to the pin 31, it is not excluded that it can be fixed directly to the link 5 and integrated therewith while maintaining a coaxial relationship with the pin 31. In this case, the coupling relationship between the pin 31 and the link 5 is not limited to being fixed as described above, but may be pivoted to allow relative rotation.

FIG. 4 shows another embodiment of the present invention, which is upside-down from the first embodiment.
The board 1 is used as a base fixed to the floor, and the board 2 is raised and lowered as a seat, and the rack 1 of the fixed board 1 is
By meshing and rolling the gears 8 on the base plate 1, the base plate 2, which is a base, is raised and lowered substantially vertically and linearly. The basic function is the first one above.
pins 31 and 4 of link 5.
Similarly, by appropriately selecting the distance between gears 51, 7, and the number of teeth of gear 51, pinion 7, and gear 8, base plate 2, which is a pedestal, can be raised and lowered linearly in the vertical direction. Further, it is obvious that modifications to the gear 51 and the drive device 9 may be adopted as appropriate in the same manner as described above.

As mentioned above, the lift chair using the parallel link of the present invention takes advantage of the advantages of the conventional parallel link mechanism, that is, even with a limited stroke of the drive device, the lifting width can be increased. This not only expands the medical range of treatment for the doctor, but also allows the seat to be raised and lowered in a straight line in the vertical direction, contributing to reducing the troublesomeness of the medical treatment for the doctor. Furthermore, the invention is not limited to dental treatment, but can also be applied to hairdressing and other applications, and the utility value of the present invention is extremely large.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a typical embodiment of the present invention;
The figure is a side view, FIG. 3 is a vertical cross-sectional view taken along the line of FIG. 1, and FIG. 4 is a vertical cross-sectional view corresponding to FIG. 3 of another embodiment. Explanation of symbols, 1, 2... Board, 11... Rack, 3, 4... Support plate, 31, 41... Pin,
5, 6... (parallel) link, 51... gear, 7
...Pinion, 8...Gear, 9...Drive device.

Claims (1)

[Claims for Utility Model Registration] 1. The upper and lower substrates 1 and 2 are maintained parallel and horizontally connected to each other by at least a pair of parallel links 5 and 6 interposed between the substrates 1 and 2 in a vertically parallel manner. The parallel links 5 and 6 are rotatable in parallel to each other within a vertical plane area using one end as a fulcrum by the driving force of a drive device 9 interposed between the substrates 1 and 2. In the elevating chair in which the base plate 1 or 2 is moved up and down in a horizontal state by the rotational movement of 6, the pins 41 and 4 at the fulcrum side ends of the parallel links 5 and 6
1 are pivotally connected to vertical parallel support plates 4, 4 which are immovably fixed to the base plate 2, and pins 31, 31 at the rotation side ends are connected to the base plate 1 by the rotation surfaces of the parallel links 5, 6. The link 5 on the base plate 1 side of the parallel links 5 and 6 has the pin 31 and the pin 31 on the rotation side end. A coaxial gear 51 is substantially integrated with the link 5 in a non-rotatable manner, and a rack 11 is fixed to the inner surface of the base plate 1 in parallel to the sliding direction of the support plates 3, 3. A support shaft 3 is provided between the support plates 3 and 3 above.
A pinion 7 and a gear 8, which are substantially fixed to each other, are supported on the support shaft 33 so as to be rotatable around the axis of the support shaft 33. 51, the gear 8 and the rack 11 are meshed with each other, thereby causing the parallel links 5, 6 to be connected to the drive device 9.
When the pins 41, 41 are rotated in a vertical plane using the pins 41, 41 as fulcrums, the gear 51 rotates the pinion 7 by a phase difference corresponding to the rotation angle of the link 5, and the gear 8 interlocking with the pinion 7 changes its number of teeth. By meshing and rolling along the rack 11 over a distance corresponding to the ratio, and by appropriately determining the ratio of the number of teeth, the parallel links 5 and 6 can rotate about the pins 41 and 41 of the boards 1 and 2. Elevating chairs that are moved away from or close to each other in a vertical straight line. 2. The chair according to claim 1, wherein the substrate 1 is a pedestal for a chair seat, and the substrate 2 is a base. 3. The chair according to claim 1, wherein the substrate 1 is a base, and the substrate 2 is a pedestal for a chair seat.