JP5561526B2 - lift device - Google Patents

Description

  The present invention relates to a lifting device that lifts and lowers a user's body or object, and can be used for a bed having a lifting function, an article lifting device, and the like.

  The bed lifting apparatus according to Patent Literatures 1 and 2 includes a lower frame, an upper frame positioned above the lower frame along the lower frame, and a drive mechanism provided between the lower frame and the upper frame. The drive mechanism has an x-type link that crosses the link in an X-shape. The bed lifting apparatus according to Patent Document 3 includes a lower frame, an upper frame positioned above the lower frame along the lower frame, and a drive mechanism provided between the lower frame and the upper frame. The drive mechanism has a C-shaped link mechanism in which the first link and the second link are arranged in a C-shape.

JP 2009-207642 A JP 2005-348893 A JP 2008-212482 A

  According to the techniques according to Patent Documents 1 and 2 described above, although there is an elevating function, the cleanability below the upper frame is not always sufficient. In Patent Document 3, since the rotation directions of the link on the head side and the foot side are reversed, two actuators as drive sources are required.

The lifting device according to the present invention includes a lower frame, an upper frame positioned above the lower frame along the lower frame, a drive mechanism disposed on one end side in the length direction of the lower frame and the upper frame, And a driven mechanism that is disposed on the other end side in the length direction of the frame and the upper frame, and that is driven by the drive mechanism. The drive mechanism has (i) a lower end portion that rotates to the lower frame. A long link that is pivotally supported and has an upper end that is movable along the length direction of the upper frame, and an upper end that is longer in the length direction of the upper frame than the upper end of the long link of the upper frame. A y-type link having a short link pivotally supported at one end and pivotally supported at an intermediate portion in the longitudinal direction of the long link; and (ii) the length of the y-type link The upper frame when the link and the short link intersect To change the crossing angle of the opposing sides provided with an actuator for lifting and lowering the upper frame, the actuator includes a body which is rotatably pivoted on said frame side, extendable relative to the body A push-up member that changes the crossing angle of the long link and the short link of the y-type link by driving the actuator, and the push-up member. Is provided between the short link and the telescopic rod of the actuator, and with the extension of the telescopic rod of the actuator, the crossing angle is made relatively small, and the long link of the y-type link and The short link is raised to increase the height of the upper end of the long link and the upper end of the short link. The upper end of the long link and the short link of the y-type link are deformed while raising the frame and deforming the y-type link by relatively increasing the crossing angle as the telescopic rod of the actuator contracts. The upper frame is lowered by lowering the upper end of the first frame, and the push-up member includes a first push-up link having one end movably provided along the length direction of the short link; is directly or indirectly connected to the first lifting link have a second push link pivotally pivoted to the extendable rod of the actuator.

  The lifting device according to the present invention includes a lower frame, an upper frame positioned above the lower frame along the lower frame, a drive mechanism disposed on one end side in the length direction of the lower frame and the upper frame, And a driven mechanism that is disposed on the other end side in the length direction of the frame and the upper frame, and that is driven by the drive mechanism. The drive mechanism has (i) a lower end portion that rotates to the lower frame. A long link that is pivotally supported and has an upper end that is movable along the length direction of the upper frame, and an upper end that is longer in the length direction of the upper frame than the upper end of the long link of the upper frame. A y-type link having a short link pivotally supported at one end and pivotally supported at an intermediate portion in the longitudinal direction of the long link; and (ii) the length of the y-type link The upper frame when the link and the short link intersect To change the crossing angle of the opposing sides comprises an actuator for lifting and lowering the upper frame.

  Let the crossing angle of the side where the long link and the short link of the y-type link cross and face the upper frame be θ. When the actuator is driven in one direction, the crossing angle θ changes. When the crossing angle θ becomes relatively small by driving the actuator, the long link and the short link of the y-type link rise with respect to the floor surface, and the height of the upper end of the long link and the upper end of the short link of the y-type link The upper frame rises with respect to the floor surface. On the other hand, when the crossing angle θ becomes relatively large by driving the actuator, the standing state of the long link and the short link of the long link of the y-type link is canceled, and the y-type link is deformed while the y-type link is deformed. The upper end of the long link and the upper end of the short link are lowered, and the upper frame descends and approaches the floor surface.

  Since the y-type link has a long link and a short link, a space can be formed on the extended line side of the short link below the upper frame. This is advantageous for cleaning the lower part of the upper frame. Furthermore, even when there is an unexpected obstacle at the time of transportation, the above-described space makes it difficult for the lifting device to interfere with the obstacle.

  According to the present invention, since the upper frame can be raised and lowered by driving the actuator, it can be used as an elevating bed, an object elevating device or the like. Furthermore, the y-type link has a long link and a short link. For this reason, unlike the x-type link in which two long links having the same length intersect each other in the X-shape, a space can be formed on the extended line side of the short link. This is advantageous for cleaning the lower part of the upper frame. Further, even when there is an unexpected obstacle at the time of transportation, the lifting device is less likely to interfere with the obstacle. Furthermore, a single actuator is sufficient.

It is a side view which shows the principal part of the raising / lowering apparatus which concerns on Embodiment 1 and shows the state driven to the top dead center. It is a side view which shows the drive mechanism of the raising / lowering apparatus which concerns on Embodiment 1 and shows the state driven to the top dead center. It is a side view which shows the principal part of the raising / lowering apparatus which concerns on Embodiment 1 and shows the state driven to the bottom dead center. It is a top view which shows the principal part of the raising / lowering apparatus which concerns on Embodiment 1 and shows the state driven to the bottom dead center. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view schematically showing a main part of an elevating device showing a state driven to a bottom dead center according to the first embodiment, and (B) is an elevational device showing a state driven to a top dead center. It is a side view which shows the principal part typically. FIG. 5A is a side view schematically showing a main part of an elevating device showing a state driven to a bottom dead center according to the second embodiment, and FIG. It is a side view which shows the principal part typically.

  The lifting device includes a lower frame, an upper frame located above the lower frame along the lower frame, a drive mechanism disposed on one end side in the length direction of the lower frame and the upper frame, and the lower frame and the upper frame. And a driven mechanism that is disposed on the other end side in the length direction and that is driven by the drive mechanism of the drive mechanism. The driven mechanism may have a function of following the raising / lowering drive of the drive mechanism. The drive mechanism includes a y-type link where the long link and the short link intersect, and an actuator for changing an intersection angle where the long link and the short link of the y-type link intersect. The lower end of the long link of the y-type link is pivotally supported by the lower frame. The upper end portion of the long link of the y-type link is movable along the length direction of the upper frame. The upper end portion of the short link of the y-link is pivotally supported on the end side in the length direction of the upper frame with respect to the upper end portion of the long link in the upper frame. The lower end portion of the short link is pivotally supported by an intermediate portion in the length direction of the long link.

  Preferably, the actuator has a main body pivotally supported on the upper frame side, and a telescopic rod that can be expanded and contracted with respect to the main body. The main body only needs to be pivotally supported on the upper frame side, and may be directly pivotally supported on the upper frame, or indirectly pivotally supported on the upper frame side via a bracket or a holder. Also good. Let the crossing angle of the side where the long link and the short link of the y-type link cross and face the upper frame be θ. It is preferable that a push-up member that changes the crossing angle θ by driving the actuator is provided.

  Preferably, the push-up member is provided between the short link and the telescopic rod of the actuator. As the telescopic rod of the actuator extends, the push-up member raises the upper frame by raising the height of the upper end of the y-type link by raising the long link of the y-type link by relatively reducing the crossing angle. Let In addition, the push-up member heights the upper end portion of the long link and the upper end portion of the short link while deforming the y-link by relatively increasing the crossing angle θ as the telescopic rod of the actuator contracts. To lower the upper frame.

  Preferably, the push-up member is pivotally supported by a first push-up link having one end portion movably provided along a length direction of the short link and a telescopic rod of the actuator connected to the push-up link. And a second push-up link. Preferably, the driven mechanism includes (i) a driven first link that is oriented along the direction of the long link of the y-type link, and (ii) a lower end portion pivotally supported by the driven first link and an upper A driven second link having an upper end pivotally supported by the frame and extending along the direction of the short link; (iii) a y-type link of the drive mechanism and a driven first link of the driven mechanism; And a connecting member for rotatably connecting the two. Preferably, the user's body or object is placed on the upper frame.

  Preferably, there is a distance ΔL in the length direction of the upper frame between a portion that pivotally supports the actuator to the upper frame side and a portion that pivotally supports the long link of the y-type link. Is provided. In this case, as described later, there is an advantage that the driving force of the actuator can be efficiently used at the bottom dead center of the upper frame, at the top dead center, and between the bottom dead center and the top dead center.

(Embodiment 1)
1 to 5 show Embodiment 1 of the present invention. The lifting device of this embodiment is applied to a bed device that lifts and lowers a user, a device that lifts and lowers an object, and the like. As shown in FIG. 1, the lifting device includes a lower frame 1 having a plurality of traveling wheels 13, an upper frame 2 positioned above the lower frame 1 along the lower frame 1, and the lower frame 1 and the upper frame 2. A drive mechanism 3 disposed on one end side in the length direction and a driven mechanism 5 disposed on the other end side in the length direction of the lower frame 1 and the upper frame 2 and driven by the drive of the drive mechanism 3 up and down. . The lower frame 1 and the upper frame 2 are arranged parallel to each other. The length direction of the lifting device is shown as the L direction. The width direction of the lifting device is shown as the W direction.

  FIG. 4 shows a plan view of the lifting device. As shown in FIG. 4, the lower frame 1 is connected to a single long lower strut 10 extending in the arrow L direction disposed in the center of the arrow W direction and one end portion 10 e in the length direction of the long lower strut 10. A first end lower column 11 extending in the W direction, and a second end lower column 12 connected to the other end portion 10f in the length direction of the long lower column 10 and extending in the arrow W direction. Thus, the lower frame 1 has an H shape in a plan view, and is compact, so that the cleaning work in the vicinity of the lower frame 1 becomes easy.

  As shown in FIG. 4, the upper frame 2 includes two long upper struts 20R, L extending in the arrow L direction and the central portions of the long upper struts 20R, 20L in the length direction (arrow L direction). Are connected to each other and extend in the direction of arrow W, and upper end support columns 20R and 20L are connected to each other in the lengthwise direction, and the first upper end support column 22 extends in the direction of arrow W. The second end upper column 23 is connected to the other ends of the column 20 in the length direction and extends in the arrow W direction. The upper frame 2 is provided with a placement unit 24 (see FIG. 1) on which a user's body or object is placed. One end 2e of the upper frame 2 is on the user's foot side. The other end 2f of the upper frame 2 is the user's head side. The head and feet may be reversed.

  As shown in FIGS. 1 and 2, the drive mechanism 3 functions as a y-type link 30 having a long link 31 and a short link 32, and a drive source for raising and laying the y-type link 30. And an actuator 33. A lower end portion of the long link 31 is pivotally supported by the lower frame 1 via a pin-shaped pivot support 31f. The upper end of the long link 31 is connected to a slider 34 via a pivotal support 31e, and the slider 34 extends along the length direction (arrow L direction) of the long upper struts 20R and 20L of the upper frame 2. It can be moved in the directions of arrows A1 and A2. The short link 32 has a central axis Pk. The upper end portion of the short link 32 is pivotally supported on the one end portion 2e side in the length direction of the upper frame 2 so as to be rotatable by a pivot support 32e. As shown in FIGS. 1 and 2, the pivotal support 32e at the upper end of the short link 32 has one end 2e rather than the position of the upper end (the pivotal support 31e, slider 34) of the long link 31 in the upper frame 2. Located on the side. This is because the y shape of the y-type link 30 is formed.

  The lower end portion of the short link 32 is pivotally supported by the pivotal support 32f at the intermediate portion in the length direction of the long link 31. As shown in FIG. 4, a total of two sets of y-type links 30 are provided on the long upper struts 20R and 20L. The two sets of y-type links 30 are synchronized with each other by a first interlocking shaft 35 formed by a pipe or a shaft connecting them. The first interlocking shaft 35 has a center axis Pc and extends in the direction of arrow W indicating the width of the lifting device.

  As shown in FIG. 1 and FIG. 2, the crossing angle on the side where the long link 31 and the short link 32 of the y-type link 30 cross and face the upper frame 2 is shown as θ. The actuator 33 is disposed between the y-type link 30 and the driven link mechanism 50 in the length direction of the upper frame 2 (the direction of the arrow L). The actuator 33 raises and lowers the upper frame 2 in the directions of arrows H1 and H2 by changing the intersection angle θ. The actuator 33 can be driven by a flow pressure such as air pressure or hydraulic pressure, and a main body 35 pivotally supported on the upper frame 2 by a pin-shaped pivot support 35e at an intermediate portion in the longitudinal direction; A telescopic rod 36 that can expand and contract with respect to the main body 35 in the directions of arrows B1 and B2 (diagonally downward and obliquely upward). The actuator 33 has a control unit 35c having a communication unit 35x connected to an operation switch (not shown). The actuator 33 is not a fluid pressure mechanism, but may be one that extends and retracts the telescopic rod 36 by a motor mounted therein.

  Further, as shown in FIGS. 1 to 3, a push-up member 37 is provided. The push-up member 37 drives the y-type link 30, and the actuator 33 drives the intersection angle θ (the intersection angle facing the upper frame 2) at which the long link 31 and the short link 32 of the y-type link 30 intersect. To change. The push-up member 37 is provided between the short link 32 and the telescopic rod 36 of the actuator 33. As shown in FIGS. 1 and 2, the push-up member 37 has a first push-up link 38 and a second push-up link 39 that are connected to each other at a constant angle. The angle formed by the first push-up link 38 and the second push-up link 39 is appropriately set according to the size of the actuator 33 and the like. The first push-up link 38 and the second push-up link 39 are integrally fixed to the first interlocking shaft 35 by welding or bolts, and are integrally interlocked with the first interlocking shaft 35. It rotates around the central axis Pc.

  A slider 40 (for example, a rolling roller or a rolling ball) is provided at one end of the first push-up link 38. The slider 40 is provided in the short link 32 so as to be movable in the directions of arrows D1 and D2 along the length direction thereof. Thereby, the direction of the short link 32 with respect to the floor surface FA is changed. As described above, the other end of the first push-up link 38 is fixed to the first interlocking shaft 35 by welding, bolts, or the like (see FIG. 4), and interlocks with the first interlocking shaft 35. The upper end portion of the second push-up link 39 is fixed to the first interlocking shaft 35 by welding, bolts or the like so as to be interlocked with the first push-up link 38 (see FIG. 4). As shown in FIGS. 1 and 2, the lower end portion of the second push-up link 39 is pivotally supported by the distal end portion of the telescopic rod 36 of the actuator 33 via a pivotal support 39f.

  Here, when the actuator 33 is actuated and the telescopic rod 36 of the actuator 33 extends obliquely downward, that is, in the direction of the arrow B1 (the direction in which the upper frame 2 is raised), the pivot support 39f at the lower end of the second push-up link 39 is The first interlocking shaft 35 moves in the direction of the arrow E1 (the direction in which the upper frame 2 is raised) together with the second push-up link 39. For this reason, the first push-up link 38 connected to the second push-up link 39 via the first interlocking shaft 35 is centered on the first interlocking shaft 35 (the direction of the arrow F1 and the direction in which the upper frame 2 is raised). It turns in the direction to turn and stand up. At this time, the slider 40 of the first push-up link 38 moves downward along the length direction of the short link 32 toward the pivotal support tool 32f (intermediate portion of the long link 31) along the arrow D1 direction. As a result, the short link 32 rotates in the direction (arrow F1 direction) that stands up with respect to the floor surface FA. Similarly, the long link 31 rotates in a direction (in the direction of the arrow R1) that rises with respect to the floor surface FA, and the crossing angle θ becomes relatively small. As a result, the height H of the upper end of the y-type link 30 (that is, the pivotal support 31e of the long link 31 and the pivotal support 32e of the short link 32) is increased, and the upper frame 2 is perpendicular to the direction of the arrow H1. Ascend in the direction.

  In contrast, when the actuator 33 operates in the opposite direction and the telescopic rod 36 of the actuator 33 contracts in the direction of arrow B2, that is, obliquely downward, the pivotal support 39f at the lower end of the second push-up link 39 rotates in the direction of arrow E2. Move. For this reason, the second push-up link 39 rotates in the direction of the arrow E2 around the first interlocking shaft 35 and is displaced in the direction to lie down with respect to the floor surface FA. In conjunction with the second push-up link 39, the first push-up link 38 also rotates about the first linkage shaft 35 in the direction of the arrow F2. At this time, the slider 40 of the first push-up link 38 moves along the short link 32 in the direction of the arrow D2 (direction away from the middle portion of the long link 31). Similarly, the long link 31 rotates in a direction (arrow R2 direction) lying on the floor surface FA. As a result, the intersection angle θ becomes relatively large. As a result, the height of the upper end portion of the long link 31 and the upper end portion of the short link 32 of the y-type link 30 is lowered. Therefore, the upper frame 2 is lowered while basically moving in the direction of the arrow H2, and the height H of the upper frame 2 is lowered.

  As described above, with the expansion and contraction of the telescopic rod 36 of the actuator 33, the first push-up link 38 and the second push-up link 39 constituting the push-up member 37 deform the y-link 30 by relatively changing the crossing angle θ. The height H of the upper frame 2 with respect to the floor surface FA can be raised or lowered by increasing or decreasing the heights of the upper end portion of the long link 31 and the upper end portion of the short link 32 of the y-type link 30.

  The driven mechanism 5 will be described. The driven mechanism 5 stabilizes the lifting operation of the upper frame 2 and has a driven link mechanism 50. As shown in FIGS. 1 and 2, the driven link mechanism 50 includes a driven first link 51 and a driven first link that are oriented substantially parallel to the direction of the long link 31 of the y-type link 30. The second link 52 has a driven second link 52 that is pivotally supported by the shaft 51 and is oriented substantially parallel to the direction of the short link 32 of the y-type link 30. The driven first link 51 has a central axis Pr. The driven second link 52 has a central axis Ps. The driven first link 51 and the driven second link 52 have a “<” shape so that the pivotal support 51 e, which is the connection point between them, is positioned outward in the arrow L direction (a direction away from the actuator 33). ing. The length of the driven first link 51 is about half of the length of the long link 31. The length of the driven second link 52 is substantially the same as that of the short link 32. Here, the lower end portion of the driven first link 51 is pivotally supported by the lower frame 1 via a pivotal support 51f. The upper end portion of the driven first link 51 is pivotally supported by the lower end portion of the driven second link 52 via a pivotal support 51e. The upper end portion of the driven second link 52 is pivotally supported on the long upper columns 20R and 20L of the upper frame 2 via a pivot support 52e.

  As shown in FIG. 1, the shape formed by the lower half of the long link 31 and the short link 32 is such that the pivotal support 32f, which is the connection point between them, is inward in the direction of arrow L (in the direction approaching the actuator 33). As a result, the shape is substantially the same as the shape of the “<” formed by the driven first link 51 and the driven second link 52.

  As shown in FIG. 4, the driven first link 51 is provided on each of the two long upper struts 20 </ b> R and 20 </ b> L parallel to each other in the upper frame 2, and a total of two sets are provided. The driven first links 51 on the long upper struts 20R and 20L are interlocked with each other by the second interlocking shaft 54. The second interlocking shaft 54 has a central axis Pd and extends in the arrow W direction. As shown in FIG. 1, a connecting member 53 is provided between the y-type link 30 of the drive mechanism 3 and the driven first link 51 of the driven mechanism 5 and extends in the arrow L direction while connecting both. The connecting member 53 has a central axis Pm. One end portion 53 e in the length direction of the connecting member 53 is pivotally supported by the first interlocking shaft 35 and is connected to the lifting member 37 and the long link 31 via the first interlocking shaft 35. The other end portion 53f in the length direction of the connecting member 53 is pivotally supported by the second interlocking shaft 54 so as to be rotatable to the intermediate portion of the driven first link 51 via the second interlocking shaft 54. It is pivotally supported. Here, as can be understood from FIG. 1, the long link 31 and the driven first link 51 are basically inclined in the same direction in parallel, and the first interlocking is performed from the pivotal support 31 f which is the lower end of the long link 31. The distance to the shaft 35 and the distance from the pivotal support 51f, which is the lower end of the driven first link 51, to the second interlocking shaft 54 are basically the same. This ensures good followability.

  Here, when the y-type link 30 of the drive mechanism 3 is driven by the actuator 33, the operation of the y-type link 30 is transmitted to the driven first link 51 of the driven mechanism 5 via the connecting member 53, and the driven first link 51. Synchronize and follow. At this time, as understood from FIG. 1, the rotation angle (direction) of the long link 31 of the y-type link 30 with respect to the floor surface FA is the rotation angle of the driven link with respect to the floor surface FA of the driven first link 51. (Direction) is preferably the same. Accordingly, the first driven link 51 of the driven link mechanism 50 preferably has a high degree of parallelism with respect to the long link 31 of the y-type link 30. Further, the rotation angle (direction) of the short link 32 of the y-type link 30 with respect to the floor surface FA is the same as the rotation angle (direction) of the driven second link 52 of the driven link mechanism 50 with respect to the floor surface FA. It is preferable. Therefore, it is preferable that the driven second link 52 has a high degree of parallelism with the short link 32 of the y-type link 30.

  As described above, according to the present embodiment, the upper frame 2 can be moved up and down while being translated in the directions of the arrows H1 and H2 by driving the actuator 33. That is, if the telescopic rod 36 of the actuator 33 is extended while the user's body or object is placed on the mounting portion 24 of the upper frame 2, the upper frame 2 is raised in the vertical direction along the arrow H1 direction. Can be made. Similarly, if the telescopic rod 36 of the actuator 33 contracts while the user's body or object is placed on the mounting portion 24 of the upper frame 2, the upper frame 2 is moved vertically along the arrow H2 direction. Can be lowered. At this time, when the upper frame 2 moves up and down between the bottom dead center and the top dead center, the one end 2e and the other end 2f in the length direction of the upper frame 2 are suppressed from being excessively displaced in the arrow L direction. The

  According to this embodiment, as shown in FIGS. 1 and 2, a space 42 is formed between the y-type link 30 of the drive mechanism 3 and the driven link mechanism 50 of the driven mechanism 5. For this reason, the downward cleaning work in the upper frame 2 becomes easy. Furthermore, according to the present embodiment, in the drive mechanism 3, the y-type link 30 having the long link 31 and the short link 32 is used instead of the x-type link that intersects the long links 31 having the same length with each other in the X-shape. Is provided. The length of the short link 32 is set shorter than the length of the long link 31. Therefore, as shown in FIG. 1 and FIG. 2, a space 43 is formed below the upper frame 2 on the extended line PA side toward the lower frame 1 of the short links 32 of the y-type link 30. For this reason, the cleaning work under the upper frame 2 becomes easy. Further, as shown in FIGS. 1 and 2, the driven link mechanism 50 has a “<” shape, so that the space is smaller than when the driven link mechanism 50 is an X-shaped X link. 45 is formed, and the cleaning work on the driven mechanism 5 side in the lower part of the upper frame 2 is facilitated.

  As shown in FIGS. 1 and 2, the pivotal support 35 e of the main body 35 of the actuator 33 (the part pivotally pivoting the actuator 33 on the upper frame 2) and the upper end of the long link 31 of the y-type link 30. A distance ΔL is provided between the pivot support 31e (the portion that pivotally supports the long link 31 on the upper frame 2).

  Here, FIGS. 5A and 5B are conceptual diagrams abstractly showing the drive mechanism 3. FIG. 5A shows a state where the upper frame 2 is at the bottom dead center. FIG. 5B shows a state where the upper frame 2 is at the top dead center. As shown in FIGS. 5A and 5B, a distance ΔL is provided between the main body 35 of the actuator 33 and the upper end portion of the long link 31 of the y-type link 30 in the upper frame 2. In raising and lowering the upper frame 2 in the directions of the arrows H1 and H2, a large driving force is required at the time of starting up the upper frame 2 stopped at the bottom dead center.

With respect to this point, according to the present embodiment, as can be understood from FIG. 5A, when the upper frame 2 is positioned on the bottom dead center side, the central axis PX of the telescopic rod 36 of the actuator 33 and the push-up member 37 The angle θA ₁ with the two push-up links 39 is 90 ° or an angle close to 90 °. Therefore, the driving force when the telescopic rod 36 of the actuator 33 extends can be transmitted to the push-up member 37 and the y-type link 30 with high transmission efficiency. Therefore, there is an advantage that the driving force of the actuator 33 can be used efficiently when the upper frame 2 of the bottom dead center is raised.

Further, as shown in FIG. 5B, even when the upper frame 2 is at the top dead center, the angle θA between the center line PX of the telescopic rod 36 of the actuator 33 and the second push-up link 39 of the push-up member 37. ₁ is ensured as large as possible within 90 °, so that the driving force when the telescopic rod 36 of the actuator 33 contracts can be transmitted to the push-up member 37 and the y-link 30 with high transmission efficiency. In this case, the output of the actuator 33 can be suppressed. Therefore, there is an advantage that is advantageous for supporting a heavy user or object near the top dead center of the upper frame 2. Further, the number of actuators 33 can be suppressed.

(Embodiment 2)
FIGS. 6A and 6B relate to the second embodiment, and show a schematic diagram of the drive mechanism 3. The present embodiment has basically the same configuration as that of the first embodiment, and exhibits the same functions and effects. FIG. 6A shows a state where the upper frame 2 is at the bottom dead center. FIG. 6B shows a state where the upper frame 2 is at the top dead center. In this embodiment, as shown in FIGS. 6 (A) and 6 (B), between the pivot support 35e of the main body 35 of the actuator 33 and the pivot support 31e at the upper end of the long link 31 of the y-type link 30. , The distance ΔL is not provided. That is, as shown to FIG. 6 (A) (B), the pivotal support tool 35e and the pivotal support tool 31e are provided in the position which overlaps in the arrow L direction. As can be understood from FIG. 6A, when the upper frame 2 is positioned on the bottom dead center side even though the distance ΔL is not provided, the central axis PX of the telescopic rod 36 of the actuator 33 and the push-up member 37. The angle θA ₂ with the second push-up link 39 is 90 ° or an angle close to 90 °. Therefore, when the upper frame 2 is at the bottom dead center, the driving force when the telescopic rod 36 of the actuator 33 extends can be transmitted to the push-up member 37 and the y-link 30 with high transmission efficiency. Therefore, there is an advantage that the driving force of the actuator 33 can be used efficiently when the upper frame 2 of the bottom dead center is raised.

Since the distance ΔL is not provided, when the upper frame 2 is positioned on the top dead center side as shown in FIG. The angle θA ₂ with the push-up link 39 is smaller than the angle θA _{1 in the} case shown in FIG. In this case, the efficiency of transmitting the driving force when the telescopic rod 36 of the actuator 33 extends to the push-up member 37 and thus to the y-type link 30 tends to decrease. In this case, it is necessary to increase the output of the actuator 33.

(Other)
The present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications within the scope not departing from the gist. The actuator is not limited to a fluid pressure mechanism, and may be a motor mechanism, in short, as long as it can operate a y-type link.

  1 is a lower frame, 2 is an upper frame, 24 is a placement unit, 3 is a drive mechanism, 30 is a y-link, 31 is a long link, 32 is a short link, 33 is an actuator, 35 is a body, 36 is a telescopic rod, 34 is a slider, 35 is a first interlocking shaft, 37 is a push-up member, 38 is a first push-up link, 39 is a second push-up link, 40 is a slider, 5 is a follower mechanism, 50 is a follower link mechanism, and 51 is a follower The first link, 52 is a driven second link, 53 is a connecting member, and 54 is a second interlocking shaft.

Claims (4)

A lower frame; an upper frame positioned above the lower frame along the lower frame; a drive mechanism disposed on one end side in the length direction of the lower frame and the upper frame; the lower frame and the An elevating device including a driven mechanism disposed on the other end side in the length direction of the upper frame and driven by the elevating drive of the drive mechanism,
The drive mechanism includes: (i) a long link whose lower end is pivotally supported by the lower frame and whose upper end is movable along the length direction of the upper frame; Of the upper frame, the upper link is pivotally supported at the end in the longitudinal direction of the upper frame relative to the upper end of the long link, and the lower end is pivoted at an intermediate portion in the longitudinal direction of the long link. A y-type link having a supported short link; and (ii) the upper frame by changing the crossing angle of the side opposite to the upper frame while the long link and the short link of the y-type link intersect. An actuator for raising and lowering ,
The actuator has a main body pivotally supported on the upper frame side, and a telescopic rod that can expand and contract with respect to the main body,
Furthermore, a push-up member that changes the intersection angle of the long link and the short link of the y-type link by driving the actuator is provided.
The push-up member is provided between the short link and the telescopic rod of the actuator, and with the extension of the telescopic rod of the actuator, the crossing angle is relatively decreased to reduce the crossing angle of the y-link. The long link and the short link are raised to increase the height of the upper end of the long link and the upper end of the short link of the y-type link to raise the upper frame, and the expansion and contraction of the actuator As the rod contracts, the crossing angle is relatively increased to deform the y-type link, while lowering the height of the upper end of the long link and the upper end of the short link of the y-type link. Lower the frame,
The push-up member has a first push-up link provided at one end thereof so as to be movable along the length direction of the short link, and is directly or indirectly connected to the first push-up link. lifting device to telescopic rods to have a second push link pivotally pivoted. Oite to claim 1, wherein the driven mechanism, (i) and the driven first link serving as the y-type the length orientation along the direction of the links of the link, to be rotatable (ii) the driven first link A driven second link having a lower end pivotally supported and an upper end pivotally supported by the upper frame and oriented along the direction of the short link; and (iii) the drive mechanism A lifting device having a connecting member that rotatably connects the y-type link and the driven first link of the driven mechanism. In Claim 1 or 2 , between the part which pivotally supports the actuator to the upper frame side, and the part which pivotally supports the long link of the y type link, the upper A lifting device provided with a distance ΔL in the length direction of the frame. In one of claims 1 to 3, lifting apparatus body or body of the user is placed on said frame.

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