JP6070839B2 - Elevating drive mechanism and elevating device using the same - Google Patents

Description

  The present invention relates to a lifting drive mechanism used for lifting devices such as a lifting bed and a table lifter.

  An elevating frame, elevating table (hereinafter referred to as “elevating body”) used in an elevating device such as an elevating bed or a table lifter can be moved up and down relative to a base frame or a base (hereinafter referred to as “base”). As an elevating support means for supporting the X-shaped symmetrical link, the X-shaped symmetrical link formed by pivotally supporting the midpoint between the upper and lower ends of a pair of links of the same length is disposed on the left and right, and one of the upper ends of the X-shaped symmetrical links Is pivotally attached to the lifting body so as to be swingable (pivotable) about a left-right axis, and the lower end of the X-shaped symmetric link immediately below the pivoted end is swingable about the left-right axis to the base body. The other end of the X-shaped symmetric link is pivotally connected to the lifting body so as to be slidable in the front-rear direction, and the lower end of the X-shaped symmetric link immediately below the connecting end is slidable in the front-rear direction. Connected to base (hereinafter referred to as “X-link type lifting support For example, refer to Patent Documents 1 and 2.) The base end portions of the front and rear, right and left lifting support links are attached to the base body so as to swing up and down around the left and right axis, Linking the free end of the lifting support link with a horizontal axis in the left-right direction, and connecting the front and rear horizontal axes with a parallel link mechanism to interlock, This is referred to as “swing-type lifting support means” (for example, see Patent Document 3).

In this case, the elevating body in the elevating device is not operated by operating the elevating body itself, but by operating elevating support means such as X-link type elevating support means and swing type elevating support means by the elevating drive mechanism. Many things are done.
For example, in the configuration of Patent Document 1, one link (2) of the pair of links (2, 3) constituting the X link type lifting support means is pushed up so that both links (2, 3) are separated from each other. The drive arm (7) is pivotally connected to the other link (3), and is substantially the same as the swing axis (Y) of the drive arm (7) for swinging the drive arm (7). A telescopic part (9A) of a direct acting actuator (expandable actuator) (9) for swinging the operating arm (8) is attached to the tip of the operating arm (8) mounted so as to be swingable around the axis. While being connected, an elevating drive mechanism in which a direct acting actuator (9) is provided on the other link (3) side is used.
Moreover, in the structure of patent document 2, the other end side of the 2nd link (4) of a pair of links (3, 4) which comprises an X link type raising / lowering support means is set to a support arm (18) in the left-right direction. A drive member (11) fixed so as to be swingable around an axis is provided, and the other end side of the first link (3) is provided on the drive member (11) from the position of the left-right axis (support arm (18)). A push-up arm (12) is provided in the direction, a drive arm (13) is provided in the direction of one end of the first link (3) from the position of the left-right axis, and a roller provided at the end of the push-up arm (12) ( 14) A guide member (15) for guiding is provided in the length direction on the other end side of the first link (3), and directly between the other end side of the first link (3) and the end of the drive arm (13). An elevating drive mechanism in which a dynamic actuator (linear actuator) (16) is connected is used.
Furthermore, in the structure of patent document 3, the longitudinal side frame (3a) of the raising / lowering body (driving part frame (3)) is provided on the starting arm (10) protruding from the horizontal shaft (6b) constituting the swing type lifting support means. An elevating drive mechanism is used in which the tip of the direct acting shaft (12b) of a direct acting actuator (direct acting drive mechanism) (12) attached to a horizontal pipe (3b) provided in the middle is connected by a pin (13).

Japanese Patent No. 4363259 Japanese Patent No. 5057387 Japanese Patent No. 2974139

In the conventional lifting drive mechanism as described above, the thrust when the linear motion shaft of the linear actuator is extended and converted is converted into torque that swings the rocking shaft, and the lifting body is lifted and lowered by this torque. Yes.
That is, in the configuration of Patent Document 1, the thrust is converted into a torque that causes the operation arm (8) and the drive arm (7) to swing about the swing axis (swing axis Y). Then, the thrust is converted into a torque that causes the drive member (11) (drive arm (13) and push-up arm (12)) to swing about the swing axis (support arm (18)). Then, the thrust forces the drive arm (10) and the front / rear and left / right lifting support links (the hoisting arms (6a, 6b, 6c, 6d)) and the like around the swing axis (the left / right axis of the lifting support link base end). It is converted into a torque to swing.
Here, the tip of the linear motion shaft of the linear actuator is the tip of the operation arm (8) in the configuration of Patent Document 1, the tip of the drive arm (13) in the configuration of Patent Document 2, and the configuration of Patent Document 3. It is rotatably connected to the tip of the activation arm (10) by a pin.

For example, as shown in FIG. 9 (a) to (c), the conventional elevating drive mechanism extends the linear motion axis B of the linear actuator A and thrusts as shown in FIG. The operating arm D is driven by F to convert the torque T to drive the swing shaft C (drive arm E).
In such a configuration, in order to increase the torque T corresponding to the lifting force for lifting the lifting body, it is necessary to increase the arm length L of the operating arm D or increase the thrust F of the direct acting actuator A. In order to increase the lifting stroke of the lifting body, it is necessary to increase the swing angle of the swing shaft C by increasing the arm length M of the drive arm E or shortening the arm length L of the operation arm D.
Therefore, the arm length L of the operating arm D is in a trade-off relationship between the lifting force and the lifting stroke, so that a large straight shaft with a large maximum thrust is required to satisfy the required specifications in the conventional lifting drive mechanism. Since a dynamic actuator is often required, there is a problem that the manufacturing cost increases.
For example, in a care lift bed using such a conventional lift drive mechanism, it is necessary to increase the lift stroke of the lift body in consideration of the burden of the caregiver. Since the arm length L is in a trade-off relationship between the lifting force and the lifting stroke as described above, a large linear motion actuator having a large maximum thrust is required.

  Accordingly, in view of the above-described situation, the present invention intends to provide a lifting drive mechanism that can suppress the maximum thrust required for the direct acting actuator to be relatively small and a lifting device using the same. is there.

The inventors of the present application have made extensive studies on the lifting drive mechanism in view of the above-described problems.
As shown in FIGS. 9A to 9C, the torque T for driving the swing shaft C (drive arm E) based on the thrust F when the linear motion shaft B of the linear motion actuator A is extended is the linear motion shaft B. In the state of FIG. 9A, which is the first position of the stroke for extending the stroke, and in the state of FIG. 9C, which is the last position of the stroke for extending the linear motion shaft B, the direction of extending the linear motion shaft B (thrust force F And the direction (longitudinal direction) of the operation link D are not orthogonal.
In this way, particularly in the vicinity of the first and last positions of the stroke, the crossing angle between the direction in which the linear motion shaft B extends (direction of thrust F) and the direction of the operation link D (longitudinal direction) deviates from a right angle. Therefore, when the component of the thrust F in the direction orthogonal to the operation arm D is Fa, the torque T = Fa · L <F · L, and the thrust F is not used effectively.
For this reason, in the vicinity of the first and last positions of the stroke extending the linear motion axis B, the load applied to the linear motion actuator A relative to the position of the linear motion shaft B of the linear motion actuator A shown in the graph of FIG. 9, the change in the load applied to the linear actuator A is large in the broken line indicating the configuration of FIG. 9, and in particular, the actuator A is applied at the beginning and end of the stroke of the linear motion shaft B (first and last of the lifting stroke). It can be seen that the applied load increases.
The inventors of the present application have completed the present invention by proceeding with examination and trial evaluation of various mechanism proposals for suppressing such fluctuations in the load applied to the direct acting actuator A.

  That is, in the lifting drive mechanism according to the present invention, in order to solve the above-described problem, the thrust generated when the linear motion actuator expands / contracts is converted into torque that swings the swing shaft, and this torque is lifted / lowered. An elevating drive mechanism used for raising the elevating body with respect to the base of the apparatus, having one end of a flexible and elongated power transmission body by tension connected to the tip of the linear motion shaft, In the state where the other end of the power transmission body by tension is fixed to the rocking shaft and attached to the power transmission rocking body having an arcuate surface to which the power transmission body by tension is formed and the linear motion shaft is contracted. The power transmission body due to the tension is bent and follows the arc-shaped surface, and when the linear actuator is driven to extend the linear motion shaft, the power transmission body due to the tension gradually increases in the arc-shaped surface. Away from before Characterized in that it is drawn from the power transmission oscillator.

According to such a configuration of the lift drive mechanism, since one end of the power transmission body by tension is connected to the tip of the linear motion shaft of the linear motion actuator, the thrust force when the linear motion shaft of the linear motion actuator is extended Acts on the power transmission body by tension, and the power transmission rocking body is attached to the other end of the power transmission body by tension, so that the tension of the power transmission body by tension acts on the power transmission rocking body.
The power transmission rocking body is formed with an arcuate surface to which the power transmission body by tension is attached, and when the linear motion shaft of the direct acting actuator is contracted, the power transmission body by tension is bent and the arc shape is When the linear motion shaft of the linear actuator is extended, the thrust of the linear motion shaft acts on the power transmission body due to the tension, and the power transmission body due to the tension is gradually separated from the arcuate surface. The power transmission rocking body is pulled out from the power transmission rocking body, and accordingly, the power transmission rocking body is rocked by the tension of the power transmission body due to the tension.
Therefore, as in the prior art, especially in the vicinity of the first and last positions of the stroke of the linear motion shaft, the direction in which the linear motion shaft is extended (thrust direction) and the crossing angle of the operation link are deviated from a right angle, so that the thrust is effective. The torque that drives the oscillating shaft based on the thrust force when the linear motion shaft of the direct acting actuator is extended can be made substantially constant without depending on the position of the stretched linear motion shaft. it can.
Therefore, the thrust of the direct acting actuator can be used effectively even in the vicinity of the first and last positions of the stroke of the direct acting shaft, and the direct acting actuator having a small maximum thrust can be used, so that the manufacturing cost can be reduced.

Here, it is preferable that the power transmission body by the tension is a roller chain, and the power transmission rocking body is a sprocket.
According to such a structure of the lift drive mechanism, the power transmission body and the power transmission rocking body by tension, which are the key parts of the lift drive mechanism, are highly reliable roller chains and sprockets, and the roller chains between adjacent rollers of the roller chain. Since the teeth of the sprocket mesh with each other, it can operate stably and reliably and ensure high reliability over a long period of time.

Moreover, it is preferable that the power transmission rocking body is substantially fan-shaped when viewed from the axial direction of the rocking shaft.
According to such a configuration of the lift drive mechanism, unnecessary shape portions of the power transmission rocking body that is a key part of the lift drive mechanism can be eliminated, and the weight and space can be saved, and the manufacturing cost can be reduced. it can.

An elevating device using the elevating drive mechanism according to the present invention is an elevating device using the elevating drive mechanism, wherein the elevating support means for supporting the elevating body so as to be movable up and down with respect to the base is a pair of the same length. An X-shaped symmetric link pivotally supporting the midpoint between the upper and lower ends of the link is disposed on the left and right, and one of the upper ends of the X-shaped symmetric link can be swung around the left-right axis. Pivotally attached to the body, the lower end of the X-shaped symmetric link directly below the pivoted end is pivotally attached to the base body so as to be swingable around the left-right axis, and the other upper end of the X-shaped symmetric link is The lower body of the X-shaped symmetrical link directly below the connecting end is connected to the base body so as to be slidable in the front-rear direction. The left and right direction connecting one of the pair of links constituting A base end portion of the linear motion actuator is connected to a central portion in the left-right direction of the coupling member, and the rocking member is located at a position opposite to the base end portion of the linear motion actuator across the middle point between one of the pair of links. A moving shaft is swingably mounted around a left and right axis, the power transmission rocking body is fixed to a central portion in the left and right direction of the rocking shaft, and the other of the pair of links is pushed up to separate the pair of links from each other. A drive arm for operation is fixed to the swing shaft.
According to such a configuration of the lifting device, since the lifting support means for supporting the lifting body so as to be liftable with respect to the base body is an X-link lifting support means, the lifting drive mechanism is used. Since the thrust of the linear actuator can be used effectively even in the vicinity of the first and last positions of the stroke of the linear motion shaft, the same effects as the lifting drive mechanism such as the ability to use a linear motion actuator with a small maximum thrust can be used. Play.

Further, the lifting device using the lifting drive mechanism according to the present invention is a lifting device using the lifting drive mechanism, wherein lifting support means for supporting the lifting body so as to be movable up and down with respect to the base is front, rear, left and right. The base end of the lifting support link is attached to the base so as to swing up and down so that it can swing around the left and right axis, and the free end of the left and right lifting support link is connected by the horizontal axis in the left and right direction In addition, the front / rear and left / right lifting support links are linked to each other, the base end of the linear actuator is connected to the lifting body, the power transmission rocking body is fixed to the left and right of the horizontal axis, The other end of the power transmission rocking body attached to the power transmission rocking body is connected to the one end of the power transmission body by the left and right tensions by a left and right connecting body, and the front and rear connecting bodies are connected to each other by a front and rear connecting body. Characterized by comprising connecting the distal end of the direct drive shaft of the linear motion actuator to one of the lateral middle portion of the right and left connecting member.
According to such a configuration of the lifting device, in the lifting device in which the lifting support means for supporting the lifting body so as to be liftable with respect to the base body is a swing type lifting support means, the lifting drive mechanism is used. Since the thrust of the direct acting actuator can be effectively used in the vicinity of the first and last positions of the stroke of the moving shaft, the same effects as the above-described lifting drive mechanism such as the ability to use a direct acting actuator with a small maximum thrust can be obtained. .

Furthermore, the lifting device using the lifting drive mechanism according to the present invention is a lifting device using the lifting drive mechanism, wherein lifting support means for supporting the lifting body so as to be liftable with respect to the base is provided in front, rear, left, and right. The base end of the lifting support link is attached to the base so as to swing up and down so that it can swing around the left and right axis, and the free end of the left and right lifting support link is connected by the horizontal axis in the left and right direction In addition, the front / rear and left / right lifting support links are linked to each other, the base end of the linear motion actuator is connected to the lifting / lowering body, and the power transmission oscillator is fixed to the horizontal center of the horizontal axis. The other end of the power transmission body by the tension is attached to one of the front and rear power transmission rocking bodies, the power transmission body by the tension is bridged to the other side of the power transmission rocking body, and the power transmission body by the tension is Wherein the serial one, characterized by comprising connecting the distal end of the direct drive shaft linear motion actuator.
According to such a configuration of the lifting device, in the lifting device in which the lifting support means for supporting the lifting body so as to be liftable with respect to the base body is a swing type lifting support means, the lifting drive mechanism is used. Since the thrust of the direct acting actuator can be effectively used in the vicinity of the first and last positions of the stroke of the moving shaft, the same effects as the above-described lifting drive mechanism such as the ability to use a direct acting actuator with a small maximum thrust can be obtained. .
In addition, since the front and rear horizontal axes are interlocked by the front and rear power transmission rocking bodies and the power transmission body by tension spanning them, the configuration of the swing type lifting support means is simplified, so the manufacturing cost is reduced. Can be reduced.

  As described above, according to the elevating drive mechanism and the elevating device using the same according to the present invention, the torque for driving the swing shaft based on the thrust force when the linear motion shaft of the direct acting actuator is extended is extended. Since it can be made almost constant regardless of the position of the linear motion shaft, the thrust of the linear motion actuator can be used effectively even in the vicinity of the first and last positions of the stroke of the linear motion shaft. There are significant effects such as the ability to keep the required maximum thrust relatively small.

It is a perspective view which shows the state which the raising / lowering body fell in the raising / lowering apparatus (when the raising / lowering support means is an X link type raising / lowering support means) using the raising / lowering drive mechanism which concerns on Embodiment 1 of this invention. It is a longitudinal front view similarly. In the said raising / lowering apparatus, it is a vertical front view which shows the state which the raising / lowering body raised. It is a front view of the raising / lowering drive mechanism which concerns on Embodiment 1 of this invention, (a) has shown the form extracted from FIG. 2, (b) from FIG. It is the front schematic diagram which shows the raising / lowering drive mechanism of this invention in general, (a) is the state which the linear motion axis | shaft of the linear motion type actuator contracted most, (b) is the intermediate state which the said linear motion shaft extended, ( c) shows a state in which the linear motion shaft is extended most. It is a graph which shows the change of the load concerning a direct-acting actuator with respect to the position of the direct-acting axis of a direct-acting actuator. In the raising / lowering apparatus using the raising / lowering drive mechanism based on Embodiment 2 of this invention (when the raising / lowering support means is a swing type raising / lowering support means), it is a perspective view which extracts and shows the principal part which shows the state which the raising / lowering body raised. is there. In the raising / lowering apparatus using the raising / lowering drive mechanism based on Embodiment 3 of this invention (when the raising / lowering support means is a swing type raising / lowering support means), it is a perspective view which extracts and shows the principal part which shows the state which the raising / lowering body raised. is there. It is a front schematic diagram showing a conventional lifting drive mechanism in general, (a) is the state where the linear motion shaft of the linear motion actuator is most contracted, (b) is the intermediate state where the linear motion shaft is extended, (c ) Shows a state in which the linear motion shaft is most extended.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments shown in the accompanying drawings, and includes all the embodiments that satisfy the requirements described in the claims. It is a waste.
In this specification, the longitudinal direction of the base frame 1A and the lifting frame 1B of the lift bed 1 is the front-rear direction, the short direction is the left-right direction, and the front view is a view as seen from the short direction.

Embodiment 1 FIG.
As shown in the perspective view of FIG. 1 and the longitudinal front view of FIGS. 2 and 3, the lifting bed (bed bed lifting device) that is a lifting device using the lifting drive mechanism 2 according to the first embodiment of the present invention. 1), an elevating support means for supporting the elevating frame 1B as an elevating body so as to be movable up and down with respect to the base frame 1A as a base body is an X-link elevating support means X.
Further, as shown in the front views of FIGS. 4 and 5, the elevating drive mechanism 2 according to Embodiment 1 of the present invention has a thrust F when the linear motion shaft B of the linear motion actuator A is extended and fluctuated. It is converted into a torque T that swings the moving shaft C, and this torque T is used to raise the elevating frame 1B relative to the base frame 1A of the elevating bed 1 and is flexible and elongated. The one end 3A of the power transmission body 3 by tension is connected to the tip of the linear movement shaft B, and the other end 3B of the power transmission body 3 by tension is fixed to the swing shaft C, and the power transmission body 3 by tension is attached to the circle. It is attached to the power transmission oscillator 4 having the arcuate surface 4A.

Here, the direct acting actuator A is, for example, an electric linear actuator or an electric cylinder, but may not be electric, and may be hydraulic or pneumatic driven depending on the application.
Further, the power transmission body 3 by tension is, for example, a roller chain, but may have a required tensile strength and flexibility, and a rope, a tube, a belt, or the like made of steel or aramid fiber may be used. Good.
Further, the power transmission rocking body 4 is, for example, substantially fan-shaped in the left-right direction provided with a part of sprocket teeth 4B, 4B,... Meshing between adjacent rollers of the roller chain. As long as the arcuate surface 4A to which the power transmission body 3 is attached is formed.
When the power transmission body 3 by tension is a roller chain and the power transmission rocking body 4 is a sprocket, a highly reliable roller chain and sprocket are used, and sprocket teeth 4B, between adjacent rollers of the roller chain, Since 4B,... Mesh with each other, it is possible to operate stably and reliably and to ensure high reliability over a long period of time.
Further, when the power transmission oscillator 4 is substantially fan-shaped when viewed in the left-right direction, an unnecessary shape portion of the power transmission oscillator 4 can be eliminated to reduce the weight and space, and reduce the manufacturing cost. it can.

As shown in FIGS. 1 to 3, the X-link type lifting support means X moves the X-shaped symmetrical link 7 formed by pivotally supporting the midpoint between the upper and lower ends of a pair of links 5 and 6 having the same length. One end 5A of the upper end of the X-shaped symmetric link 7 is pivotally attached to the elevating frame 1B so as to be swingable around the left and right axis, and the lower end 6B of the X-shaped symmetric link 7 immediately below the pivot end. Is pivotally attached to the base frame 1A so as to be swingable about a left-right axis.
The other end 6A of the upper end of the X-shaped symmetrical link 7 is connected to the elevating frame 1B so as to be slidable in the front-rear direction by guiding the roller 8A with the guide member 9A in the front-rear direction. The lower end 5B of the letter-shaped symmetrical link 7 is connected to the base frame 1A so as to be slidable in the front-rear direction by guiding the roller 8B with the guide member 9B in the front-rear direction.

Further, the base end portion of the linear actuator A is connected to the central portion in the left-right direction of the connecting member 10 in the left-right direction that connects the left and right links 5, 5, so A swing shaft C is attached to a position opposite to the base end portion of the dynamic actuator A so as to be swingable about a left-right axis.
Furthermore, the power transmission oscillating body 4 is fixed to the center portion in the left-right direction of the oscillating shaft C, and the drive arms 11 and 11 for oscillating the pair of links 5 and 6 away from each other are pushed up. The rollers 12 and 12 at the tips of the drive arms 11 and 11 are guided by the guide members 13 and 13 in the longitudinal direction of the links 6 and 6.

In the elevating drive mechanism 2 of the present invention shown in general in the schematic front view of FIG. 5, when the linear motion shaft B of the linear motion actuator A is extended as shown in FIGS. The power transmission rocking body 4 swings because the tension of the power transmission body 3 due to the tension acts on the power transmission rocking body 4.
That is, the power transmission oscillating body 4 is formed with an arcuate surface 4A (see FIG. 5C) to which the power transmission body 3 by tension is attached, and the linear motion axis B of the linear motion actuator A is contracted. In the state of 5 (a), the power transmission body 3 by tension is bent and follows the arcuate surface 4A. Therefore, when the linear motion axis B of the linear motion actuator A is extended, the thrust F of the linear motion shaft B is increased. Acting on the power transmission body 3 by tension, as shown in FIGS. 5B and 5C, the power transmission body 3 by tension is gradually pulled out of the power transmission rocking body 4 so as to be separated from the arcuate surface 4A. Accordingly, the power transmission rocking body 4 is swung by the tension of the power transmission body 3 due to the tension.

Therefore, as in the prior art, especially in the vicinity of the first and last positions of the stroke of the linear motion shaft B, the direction of extending the linear motion shaft B (direction of thrust F) and the operation link D (see FIG. 9) intersect. The torque T for driving the oscillating shaft C based on the thrust F when the linear motion shaft B of the direct acting actuator A is stretched is extended without causing the thrust F to be effectively not used due to the angle deviating from the right angle. It can be made substantially constant (T = F · L) without depending on the position of the linear motion axis B.
Therefore, in the change of the load applied to the linear actuator A with respect to the position of the linear axis B of the linear actuator A shown in the graph of FIG. The load variation applied is reduced, and the load applied to the actuator A is increased even at the beginning and end of the stroke of the linear motion shaft B (first and last of the lifting stroke) as shown by the broken line in the configuration of FIG. There is no.
According to such a structure of the lift drive mechanism 2, the thrust of the direct acting actuator A can be used effectively even in the vicinity of the first and last positions of the stroke of the direct acting shaft B. Therefore, the direct acting type with a small maximum thrust. Since the actuator A can be used, the manufacturing cost can be reduced.

Embodiment 2. FIG.
As shown in the perspective view of FIG. 7, the lifting bed (bed lifting device) 1 that is a lifting device using the lifting drive mechanism 2 according to the second embodiment of the present invention is a lifting frame (lifting) (not shown). The lifting support means for supporting the body) with respect to a base frame (base body) (not shown) so as to be liftable is a swing type lifting support means S.
The swing type lifting support means S is attached to the base frame so that the base ends of the lifting support links 14, 14,... The free ends of the elevating support links 14, 14 are connected by horizontal axis 15A, 15B in the left-right direction which is a swing axis C, and the elevating support links 14, 14,.

Further, the base end portion of the direct acting actuator A is connected to an elevating frame (not shown), and the power transmission oscillators 4 and 4 are fixed to the left and right of the horizontal shafts 15A and 15B. The ends A, 3A of the left and right power transmission bodies 3, 3 to which the ends 3B, 3B are attached are connected to each other by the left and right connecting bodies 16, and the left and right connecting bodies 16, 16 are connected to each other by the front and rear connecting bodies 17. The front end of the direct acting shaft B of the direct acting actuator A is connected to the central portion in the left and right direction of one of the left and right connecting bodies 16 and 16 of the front and rear left and right connecting bodies 16 (on the side of the horizontal shaft 15A).
Even in such a configuration, as in the lift drive mechanism 2 of the first embodiment, the lift drive mechanism 2 is configured by the direct acting actuator A, the power transmission body 3 and the power transmission rocking body 4 by tension, The same effects as those of the first embodiment are obtained.

Embodiment 3 FIG.
As shown in the perspective view of FIG. 8, an elevating bed (bed bed elevating device) 1, which is an elevating device using the elevating drive mechanism 2, according to the third embodiment of the present invention is an elevating frame (elevating / lowering not shown). The lifting support means for supporting the body) with respect to a base frame (base body) (not shown) so as to be liftable is a swing type lifting support means S.
As in the second embodiment, this swing type lifting support means S swings up and down so that the base end portions of the front and rear lifting support links 14, 14,... Can swing around the left and right axis. Are attached to the base frame, and the free end portions of the left and right lifting support links 14, 14 are connected by horizontal shafts 15A, 15B in the left and right directions which are swinging axes C, and the front, rear, left and right lifting support links 14, 14,. It is to be linked.

Further, the base end portion of the direct acting actuator A is connected to a lifting frame (not shown), and the power transmission oscillators 4 and 4 are fixed to the central portions in the left and right directions of the horizontal shafts 15A and 15B. The other end 3B of the power transmission body 3 by tension is attached to one power transmission rocking body 4 (the power transmission rocking body 4 fixed to the horizontal shaft 15B), and the power transmission body 3 by tension is connected to the other power. The transmission rocking body 4 (the power transmission rocking body 4 fixed to the horizontal shaft 15A) is bridged, and the tip of the direct acting shaft B of the direct acting actuator A is connected to one end 3A of the power transmitting body 3 by tension. ing.
Even in such a configuration, as in the lift drive mechanism 2 of the first embodiment, the lift drive mechanism 2 is configured by the direct acting actuator A, the power transmission body 3 and the power transmission rocking body 4 by tension, The same effects as those of the first embodiment are obtained.
In addition, the front and rear horizontal shafts 15A and 15B are interlocked by the front and rear power transmission oscillating bodies 4 and 4 and the power transmission body 3 by tension over them, so that the configuration of the swing type lifting support means S is simple. Therefore, the manufacturing cost can be reduced.

  In the above description, the case where the lifting device of the present invention is the lifting bed (bed floor lifting device) 1 is shown. However, the lifting device of the present invention includes a lifter for a stretcher, a table lifter, or a transfer device. (Tables) and other lifting devices that move in the vertical direction other than the bed are also included. In addition to the lifting devices that move in the vertical direction, the back of the bed that swings (rotates) the back floor (back bottom). A lifting device and a reclining device for a seat or chair for rotating (swinging) the backrest are also included.

A Direct-acting actuator B Direct-acting axis C Oscillating axis D Operating arm E Drive arm F Thrust Fa Fax component L, M Arm length S Swing type lifting support means T Torque X X link type lifting Support means 1 Elevating bed (elevating device)
1A Base frame (base)
1B Elevating frame (elevating body)
2 Lifting drive mechanism 3 Power transmission body 3A by tension One end 3B Other end 4 Power transmission rocking body 4A Arc-shaped surface 4B Teeth 5, 6 Links 5A, 6A Upper end 5B, 6B Lower end 7 X-shaped symmetrical links 8A, 8B Rollers 9A, 9B Guide member 10 Connection member 11 Drive arm 12 Roller 13 Guide member 14 Lift support links 15A, 15B Horizontal axis 16 Left and right connection body 17 Front and rear connection body

Claims (6)

A thrust drive mechanism used to raise the lifting body with respect to the base of the lifting device is converted to a torque that swings the swinging shaft, when the linear motion actuator extends and contracts the linear motion shaft. Because
One end of a flexible and elongated power transmission body by tension is connected to the tip of the linear movement shaft, and the other end of the power transmission body by tension is fixed to the swing shaft, and power by the tension The power transmission body is attached to a power transmission rocking body formed with an arcuate surface to which the transmission body is attached and the linear motion shaft is contracted, so that the power transmission body due to the tension bends and follows the arcuate surface. An elevating drive mechanism characterized in that when the linear actuator is extended by driving a dynamic actuator, the power transmission body due to the tension is gradually pulled out from the power transmission rocking body so as to be separated from the arcuate surface.   The lifting drive mechanism according to claim 1, wherein the power transmission body by tension is a roller chain, and the power transmission rocking body is a sprocket.   The elevating drive mechanism according to claim 1 or 2, wherein the power transmission oscillating body is substantially fan-shaped when viewed from the axial direction of the oscillating shaft. A lifting device using the lifting drive mechanism according to any one of claims 1 to 3,
An elevating support means for supporting the elevating body so as to be movable up and down with respect to the base body is provided with X-shaped symmetrical links formed by pivotally supporting midpoints between upper and lower ends of a pair of links having the same length. One of the upper ends of the X-shaped symmetric link is pivotally attached to the lifting body so as to be swingable about a left-right axis, and the lower end of the X-shaped symmetric link just below the pivoted end is about the left-right axis. The other end of the X-shaped symmetric link is pivotally attached to the base body so as to be able to swing, and the other end of the X-shaped symmetric link is slidable in the front-rear direction. The lower end of the X-shaped symmetric link is directly below the connecting end. It is connected to the base body so as to be slidable in the front-rear direction,
The base end portion of the linear actuator is connected to the central portion in the left-right direction of a connecting member in the left-right direction that connects one of the pair of links constituting the left and right X-shaped symmetrical links, and the pair of links The swing shaft is swingably mounted about a left-right axis at a position opposite to the base end of the linear motion actuator with the midpoint between the two, and the power is mounted at the center in the left-right direction of the swing shaft. A lifting drive mechanism characterized in that a transmission rocking body is fixed, and a driving arm for pushing up the other of the pair of links to separate the pair of links from each other is fixed to the rocking shaft. The lifting device that was. A lifting device using the lifting drive mechanism according to any one of claims 1 to 3,
The base body is configured such that the lift support means for supporting the lift body so as to be able to move up and down relative to the base body swings up and down so that the base end portions of the front and rear lift support links can swing about the left and right axis. And connecting the free ends of the right and left lifting support links on the horizontal axis in the left and right direction, and interlocking the lifting support links on the front and rear, left and right,
A base end portion of the linear actuator is connected to the elevating body, the power transmission oscillating body is fixed to the left and right of the horizontal axis, and the left and right sides of the left and right power transmission oscillating bodies are attached to the other end. The one ends of the power transmission body by tension are connected by a left and right connecting body, the front and rear connecting bodies are connected by a front and rear connecting body, and the linear motion type is connected to one of the front and rear left and right connecting bodies in the left-right direction central portion. An elevating device using an elevating drive mechanism characterized in that a tip of a linear motion shaft of an actuator is connected. A lifting device using the lifting drive mechanism according to any one of claims 1 to 3,
The base body is configured such that the lift support means for supporting the lift body so as to be able to move up and down relative to the base body swings up and down so that the base end portions of the front and rear lift support links can swing about the left and right axis. And connecting the free ends of the right and left lifting support links on the horizontal axis in the left and right direction, and interlocking the lifting support links on the front and rear, left and right,
A base end portion of the linear motion actuator is connected to the lifting body, the power transmission rocking body is fixed to a central portion in the horizontal direction of the horizontal axis, and power transmission by the tension is applied to one of the front and rear power transmission rocking bodies. The other end of the body is attached, the power transmission body by the tension is bridged to the other side of the power transmission rocking body, and the tip of the linear motion shaft of the linear actuator is connected to the one end of the power transmission body by the tension. An elevating device using an elevating drive mechanism characterized by comprising:

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