JP2012020827A - Lifter for installation type wheelchair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifter for an installation type wheelchair having a simple elevating/lowering mechanism capable of elevating an elevating/lowering plate while forwardly sending out the plate.SOLUTION: An elevating/lowering plate 11 of the lifter 1 for the installation type wheelchair is supported by a quadric parallel link mechanism including a front side turning link 12 and a rear side turning link 13, and a turning mechanism 14 for elevating/lowering operation is arranged at the side of the elevating/lowering plate 11. The elevating/lowering plate 11 with a wheelchair 6 mounted thereon is elevated while being sent out forwardly by the quadric parallel link mechanism. At the elevated position 11B, a space between a front edge of the elevating/lowering plate 11 and a highest step face 4 of a stairway can be reduced, and any component installation space need not be secured below the elevating/lowering plate 11. Thus, the elevating/lowering plate 11 can be lowered to substantially the same level position as a ground surface 3, and the loading work of the wheelchair 6 on the elevating/lowering plate 11 and the unloading work of the wheelchair therefrom can be facilitated.

Description

  The present invention relates to a lifter for an installed wheelchair suitable for being installed and used at a step portion at a doorway of a house.

  In the case where a step is provided at the entrance of a general house, etc., a device such as a slope is provided to make the wheelchair free for a wheelchair user or the like. However, there are many cases where a space for providing a long slope cannot be obtained in a general house, and a slope with a steep slope is often provided. In this case, it is a great burden for the wheelchair user or the caregiver to push the wheelchair along the steep slope. Therefore, it is desirable to install a lifting device for a wheelchair in the stepped portion so that the wheelchair can be lifted from the ground to the same height as the entrance, so that the stepped portion can be easily moved.

  A wheelchair lifting device that can be used for such a purpose is disclosed in Patent Document 1. The arm slide type lifting device disclosed herein has a simple lifting structure that raises a floor plate to a predetermined height position from the ground by extending a pantograph type folding arm.

JP 2007-302476 A

  However, in a conventional wheelchair lifting apparatus provided with a simple lifting mechanism using a folding arm or the like, the lifting plate on which the wheelchair is placed only moves up and down vertically. In general, entrances such as ordinary houses are provided with two or three steps. In the case of a single step, the wheelchair may be lifted vertically from the lower ground surface, but in the case of a few steps, the wheelchair is simply lifted vertically from the lowest step surface. Between the wheelchair and the highest step surface, a gap corresponding to the step surface is formed in the horizontal direction. Therefore, it is necessary to move the wheelchair from the lifting plate side by spanning a plate or the like so as to fill the gap. In this case, a wheelchair user who does not have a caregiver cannot move through the stepped portion, and it is extremely inconvenient for the caregiver even when the caregiver is on.

  In view of these points, the object of the present invention is to provide a simple elevating mechanism that can raise and lower the elevating plate while pushing it forward, and to install and use it at a step portion of a front door of a general house or the like. The idea is to propose a suitable wheelchair lifter.

In order to solve the above-mentioned problem, the lifter for a stationary wheelchair of the present invention is
A lifting plate for wheelchairs;
In order to raise and lower the elevating plate between a lowered position and a raised position that protrudes forward, four-joints having a front turning link and a rear turning link that respectively support the left and right sides of the lifting plate A parallel link mechanism;
The lifting plate is positioned at the raised position from the horizontally tilted position where the lifting plate is positioned at the lowered position, with the front pivot link and the rear pivot link being centered on the link node at the lower end thereof. A swivel mechanism for raising and lowering disposed on the side of the elevating plate in order to swivel to a standing position that stands vertically; and
It has the raising / lowering manual operation member for driving the said raising / lowering turning mechanism, It is characterized by the above-mentioned.

  In the lifter for an installed wheelchair according to the present invention, the lifting plate on which the wheelchair is placed rises while being pushed forward by the four-link parallel link mechanism. Therefore, it is possible to prevent a gap from being formed between the front edge of the lifting plate and the highest step surface of the staircase at the raised position. Further, since the raising / lowering turning mechanism for driving the four-node parallel link mechanism is disposed on the side of the lifting plate, a part installation space is substantially unnecessary on the lower side of the lifting plate. Therefore, since the lifting plate can be lowered to a position that is almost the same height as the ground surface, the work of placing the wheelchair on the lifting plate can be easily performed.

  Here, right and left handrails are attached to the left and right side portions of the lifting plate so that the wheelchair wheels and the like are not detached from the lifting plate while the lifting plate is being raised and lowered. It is desirable to attach front and rear car stops to the part. In this case, in order to be able to easily perform the work when moving the wheelchair from the lifting plate, each of the vehicle stops is opened from the closed position where it is vertically raised to the horizontal position. It is desirable to dispose the front and rear vehicle stop opening / closing mechanisms that are swung up and down, and to arrange the front and rear opening / closing manual operation members for driving each of the vehicle stop opening / closing mechanisms.

  Next, the raising / lowering turning mechanism protrudes at right angles to the turning direction of the front turning link from a midway position in the length direction of the front turning link in order to turn the front turning link and the rear turning link in conjunction with each other. The front projecting arm, the rear projecting arm projecting in the same direction as the front connecting arm from the midway position in the length direction of the rear pivot link, and the front pivot link and the rear pivot link Therefore, it is preferable that the front and rear projecting arms are provided with a horizontal coupling arm having front and rear ends that are pivotably coupled to the front and rear projecting arms.

  In this way, the horizontal connecting arm is bridged between the front and rear swivel links, and the length of the front and rear protruding arms is set appropriately, so that the horizontal connecting arm moves up and down as the swivel link turns. The installation space for the horizontal connecting arm can be reduced.

  And a pivoting bracket that is supported so as to be pivotable in the vertical direction about a fulcrum located between the front pivot link and the rear pivot link, and the pivot bracket. A rotary actuator mounted on the slide shaft, and a slide shaft that is supported by the rotary bracket so as to be slidable in the front-rear direction passing through the fulcrum, and whose tip is rotatably connected to the front projecting arm; It can be set as the structure provided with the linear motion mechanism which consists of a nut and a screw | thread which converts rotation of the said rotation actuator into the sliding motion of the said slide shaft.

  Instead, the elevating swing mechanism includes a rotary actuator, and a gear-type transmission mechanism that transmits the output rotation of the rotary actuator to the link node at the lower end of the front swing link or the rear swing link. It can also be configured.

  And a pivot bracket that is supported by the lifting pivot mechanism so as to be pivotable in a vertical direction around a fulcrum located between the front pivot link and the rear pivot link, and the pivot bracket. It is also possible to adopt a configuration in which the tip of the telescopic rod of the hydraulic cylinder is rotatably connected to the front protruding arm or the rear protruding arm.

  In the lifter for an installed wheelchair according to the present invention, a four-joint parallel link mechanism is used to raise and lower the lifting plate on which the wheelchair is placed while pushing forward. Accordingly, when installed on about two or three steps, the lift plate rises while approaching the highest step surface, so that the gap formed between the lift plate and the step surface can be narrowed. Further, since the raising / lowering turning mechanism for driving the four-node parallel link mechanism is disposed on the side of the lifting plate, a part installation space is substantially unnecessary on the lower side of the lifting plate. Therefore, the elevating plate can be lowered to almost the same height as the ground surface. Therefore, the operation | work which puts a wheelchair on a raising / lowering board, and the operation | work which removes from there can be performed easily.

(A), (b), and (c) are the top views, side views, and front views which respectively show the lifter for stationary wheelchairs which applied this invention, and shows the state which has a raising / lowering board in a descent | fall position. is there. (A), (b), and (c) are the top view, side view, and front view which respectively show the lifter for installation type wheelchairs of FIG. 1, and the state which exists in the raising position where the raising / lowering board protruded ahead is shown. It is shown. (A) is a partial top view which shows the part of a horizontal connection arm, (b) is the partial side view. (A) And (b) is the partial top view and partial side view which respectively show the drive source part of the turning mechanism for raising / lowering. (A) And (b) is the top view and side view which show another example of the turning mechanism for raising / lowering, respectively. (A), (b) and (c) are the top view, side view, and end elevation which respectively show the principal part of the turning mechanism for raising / lowering of FIG.

  Below, with reference to drawings, the embodiment of the lifter for stationary wheelchairs to which the present invention is applied is described.

  FIGS. 1A, 1B, and 1C are a plan view, a side view, and a front view, respectively, showing a lifter for a stationary wheelchair to which the present invention is applied, and shows a state in which a lifting plate is in a lowered position. Is. 2 (a), 2 (b) and 2 (c) are a plan view, a side view and a front view, respectively, showing a lifter for an installed wheelchair, showing a state in which the lifting plate is in a raised position protruding forward. Is.

  If it demonstrates with reference to these figures, the lifter 1 for installation type wheelchairs will be installed and used for the level | step-difference part 2 of the entrance porch of a common house, for example. For example, in the stepped portion 2, three steps are formed from the ground surface 3, and the highest step surface 4 is connected to the entrance. The lifter 1 for an installed wheelchair is installed on the ground surface 3 on the near side of the lowest step surface 5.

  The lifter 1 for an installed wheelchair includes a gantry 10 fixed to the ground surface 3. A horizontal rectangular contour elevating plate 11 for placing the wheelchair 6 is placed on the gantry 10 via a four-joint parallel link mechanism. It is supported. The four-link parallel link mechanism includes a front turning link 12 and a rear turning link 13 that support the left and right sides of the elevating plate 11, respectively. The lower ends of the front turning link 12 and the rear turning link 13 are link nodes 12a and 13a attached to the gantry 10, respectively, and the upper ends thereof are link contacts 12b and 13b attached to the elevating plate 11, respectively. Yes.

  Accordingly, the lift plate 11, the left and right front swivel links 12, the left and right rear swivel links 13, and the mount 10 are used to lower the lift plate 11 to the lowered position 11A shown in FIG. A four-link parallel link mechanism for moving up and down is constructed. That is, when the front-side turning link 12 and the rear-side turning link 13 are turned around the link nodes 12a and 13a at the lower ends thereof to the fall positions 12A and 13A that have fallen horizontally forward as shown in FIG. 11 is positioned at the lowered position 11A. When the front-side turning link 12 and the rear-side turning link 13 are turned to the standing positions 12B and 13B that are vertically raised as shown in FIG. 2, the elevating plate 11 is positioned at the raised position 11B that protrudes forward.

  As described above, in the lifter 1 for an installed wheelchair, the lift plate 11 on which the wheelchair 6 is placed rises while being pushed forward by the four-link parallel link mechanism. Therefore, it is possible to prevent a gap from being formed between the front edge 11a of the elevating plate 11 and the highest step surface 4 of the staircase at the ascending position 11B. Therefore, the operation | work which moves the wheelchair 6 from the raising / lowering board 11 to the step surface 4 becomes easy.

  Next, in the lifter 1 for an installed wheelchair, an elevating turning mechanism 14 for turning the front turning link 12 and the rear turning link 13 is incorporated in a part of the gantry 10 on the side of the elevating plate 11. Since the raising and lowering turning mechanism 14 for driving the four-node parallel link mechanism is disposed on the side of the lifting plate 11, a component installation space is substantially unnecessary on the lower side of the lifting plate 11. Therefore, the elevating plate 11 can be lowered to almost the same height as the ground surface 3. Therefore, the operation | work which mounts the wheelchair 6 on the raising / lowering board 11 from the ground surface 3 can also be performed easily.

  Here, right and left pipe handrails 15 processed into an inverted U-shape on the left and right sides of the lifting plate 11 so that the wheelchair wheels and the like are not detached from the lifting plate while the lifting plate is being raised and lowered. 16 is attached. In addition, rectangular plate-like front and rear wheel stops 17 and 18 are attached to the front and rear ends of the lifting plate 11. Opening and closing hydraulic cylinders 19 and 20 (vehicle stopping opening / closing mechanism) are disposed between the vehicle stoppers 17 and 18 and between the lifting plates 11. Opening / closing manual operation levers 21 and 22 (opening / closing manual operation members) for driving the hydraulic cylinders 19 and 20 are attached to the front and rear portions of one pipe handrail 15. In addition, manual operation buttons 23 and 24 (elevating manual operation members) for driving the elevating turning mechanism 14 to elevate the elevating plate 11 are attached to the middle part of the pipe handrail 15 in the front-rear direction. Yes. Note that the front wheel stopper 17 has a predetermined width and is bridged over the step surface 4 in a state where it is tilted outward, so that the wheelchair 6 can be moved smoothly even when there is a gap between them. it can.

  Next, the raising / lowering turning mechanism 14 is provided with a horizontal connecting arm 25 spanned between the front turning link 12 and the rear turning link 13 in conjunction with each other. FIG. 3A is a partial plan view showing a portion of the horizontal connecting arm 25, and FIG. 3B is a partial side view thereof. As shown in these figures, the left and right front turning links 12 are connected by a front connecting shaft 28 extending in the width direction between the link nodes at their lower ends, and turn together. Similarly, the left and right rear turning links 13 are also connected by a rear connecting shaft 29 and turn together.

  The front end of the horizontal connecting arm 25 that connects the front and rear swiveling links 12 and 13 is rotatably connected to the front end of the front protruding arm 26 attached to the front swiveling link 12. The end is connected to the tip of the rear protruding arm 27 attached to the rear turning link 13 in a rotatable state. The front projecting arm 26 projects from the midway position in the length direction of the front swivel link 12 at a right angle to the swivel direction of the front swivel link 12, and projects upward in the collapsed position 12A and forward in the standing position 12B. Protrudes horizontally. The rear protruding arm 27 is similarly attached to the rear turning link 13. In this way, the horizontal connecting arm 25 is bridged between the front and rear turning links 12 and 13 and the protruding lengths of the front and rear protruding arms 26 and 27 are set appropriately, so The vertical movement range of the horizontal connecting arm 25 accompanying the turning can be reduced, and the installation space for the horizontal connecting arm 25 can be reduced.

  Next, FIGS. 4A and 4B are a partial plan view and a partial side view, respectively, showing a drive source portion of the elevation turning mechanism 14. The raising / lowering turning mechanism 14 includes a rotating bracket 31 attached to the gantry 10 at a position outside the horizontal connecting arm 25. The pivot bracket 31 is supported so as to be pivotable in the vertical direction around a fulcrum 32 positioned between the front pivot link 12 and the rear pivot link 13. A rotary actuator 35 including a motor 33 and a speed reducer 34 is mounted on the rotary bracket 31 downward. In addition, a slide shaft 36 is supported on the pivotable bracket 31 so as to be slidable in the front-rear direction, and the center axis of the slide shaft 36 passes through a fulcrum 32. Therefore, the slide shaft 36 can swing back and forth around the fulcrum 32.

  A screw is engraved on the outer peripheral surface of the slide shaft 36, and a nut that is rotationally driven by a rotary actuator 35 is attached to the side of the rotary bracket 31. The rotation of the nut causes the slide shaft 36 to move along its axis. It can move back and forth linearly in the direction. The distal end portion of the slide shaft 36 is rotatably connected to a support shaft 37 that is connected to the distal end of the front protruding arm 26. In the state where the slide shaft 36 is located at the retracted position 36A shown by the imaginary line in FIG. 4, the front and rear turning links 12, 13 are at the fall positions 12A, 13A, and the elevating plate 11 is at the lowered position. When the slide shaft moves to the forward movement position 36B indicated by the solid line in FIG. 4, the front and rear turning links 12 and 13 turn to the upright positions 12B and 13B, and the elevating plate 11 protrudes forward to the raised position 11B. Positioned.

  Note that a hydraulic cylinder may be used in place of the rotary actuator 35 as the ascending / descending turning mechanism 14. In this case, a hydraulic cylinder may be mounted on the rotary bracket 31 and the tip of the telescopic rod may be connected to the support shaft 37 in a rotatable state.

(Another example of lifting mechanism)
5 (a) and 5 (b) are a plan view and a side view showing another example of the raising / lowering turning mechanism, and FIGS. 6 (a), 6 (b) and 6 (c) are respectively for raising and lowering in FIG. It is the top view which shows the principal part of a turning mechanism, a side view, and an end view. In addition, since structures other than the turning swivel mechanism 14A are the same as those of the lifter 1 for an installed wheelchair shown in FIGS. 1 to 4, the corresponding parts are denoted by the same reference numerals and description thereof is omitted.

  The raising / lowering turning mechanism 14 </ b> A shown in FIG. The drive side gear 42 is rotationally driven by the rotary actuator 41. The drive-side gear 42 meshes with a fan-shaped spur gear 43 in which external teeth are formed along a circular outer peripheral surface that forms an arc of 90 degrees. A rear connection shaft 29 connected to the lower end of the rear turning link 13 is fixed to the center of the fan-shaped spur gear 43.

  The state shown in FIG. 5 is a state in which the elevating plate 11 is in the raised position 11B. When the drive actuator 42 is driven to rotate counterclockwise by driving the rotary actuator 41, the fan-shaped spur gear 43 engaged therewith rotates clockwise, and the rear connecting shaft 29 connected to the center thereof is also provided. Rotate clockwise. As a result, the rear turning link 13 whose lower end is fixed to the rear connecting shaft 29 turns rearward around the lower end, and turns from the standing position 13B to the fall position 13A that has fallen horizontally rearward. Since the front and rear swivel links 12 and 13 are connected by the horizontal connecting arm 25, both of them simultaneously move to the rearward fall position, and the elevating plate 11 is lowered to the lowering position 11A. By the reverse drive, the lift plate 11 rises from the lowered position 11A to the raised position 11B that protrudes forward.

DESCRIPTION OF SYMBOLS 1 Lifter for installation type wheelchair 2 Step part 3 Ground surface 4 Step surface 5 Step surface 6 Wheelchair 10 Mount 11 Lifting plate 11A Lowering position 11B Lifting position 12 Front turning link 13 Rear turning link 12a, 13a Link node 12b on the lower end side, 13b Link nodes 12A on the upper end side, 13A Falling position 12B, 13B Standing position 14, 14A Lifting turning mechanism 15, 16 Pipe handrail 17, 18 Car stop 19, 20 Opening / closing hydraulic cylinder 21, 22 Opening / closing manual operation lever 23, 24 Lifting manual operation button 25 Horizontal connecting arm 26 Front protruding arm 27 Rear protruding arm 28 Front connecting shaft 29 Rear connecting shaft 31 Rotating bracket 32 Support point 33 Motor 34 Reduction gear 35 Rotating actuator 36 Slide shaft 36A Backward position 36B Forward position 37 Support shaft 41 Rotating actuator 42 Drive-side gear 43 Fan-shaped spur tooth

Claims (6)

A lifter (1) for a wheelchair installed on a stepped portion (2) and used.
A lifting plate (11) on which the wheelchair (6) is placed;
In order to raise and lower the elevating plate (11) between the lowered position (11A) and the raised position (11B) protruding forward, the front side turn supporting the left and right sides of the elevating plate (11), respectively. A four-bar parallel link mechanism with a link (12) and a rear pivot link (13);
The front pivot link (12) and the rear pivot link (13) are horizontally arranged with the lift plate (11) in the lowered position (11A) with the link node (12a, 13a) at the lower end thereof as the center. In order to swivel from the fall position (12A, 13A) that has fallen to the upright position (12B, 13B) in which the lift plate (11) stands vertically at the lift position (11B) A raising and lowering turning mechanism (14, 14A) disposed on the side of the plate (11);
The lifter (1) for an installed wheelchair characterized by having a lifting / lowering manual operation member (23, 24) for driving the lifting / lowering turning mechanism (14, 14A). In claim 1,
Left and right handrails (15, 16) are attached to the left and right sides of the lifting plate (11),
Front and rear wheel stops (17, 18) are attached to the front and rear ends of the lifting plate (11),
A front and rear vehicle stop opening / closing mechanism (19, 20) for turning each of the vehicle stops (17, 18) from a vertically standing closed position to an open position horizontally falling outward is disposed.
The handrail (15) includes front and rear opening / closing manual operation members (21, 22) for driving the vehicle stop opening / closing mechanisms (19, 20), and the lifting manual operation members (23, 24). A lifter (1) for an installed wheelchair, characterized in that is arranged. In claim 2,
The raising and lowering turning mechanism (14, 14A)
A front protruding arm (26) protruding perpendicularly to the turning direction of the front turning link from a midway position in the length direction of the front turning link (12);
A rear protruding arm (27) protruding in the same direction as the front connecting arm from a midway position in the length direction of the rear turning link (13);
In order to link the front swivel link (12) and the rear swivel link (13), front and rear ends are connected to the front projecting arm (26) and the rear projecting arm (27), respectively. A lifter (1) for an installed wheelchair characterized by comprising a horizontal connecting arm (25). In claim 3,
The raising and lowering turning mechanism (14)
A pivot bracket (31) supported so as to be pivotable in the vertical direction about a fulcrum (32) located between the front pivot link (12) and the rear pivot link (13);
A rotary actuator (35) mounted on the pivot bracket (31);
A slide shaft (36) supported by the rotary bracket (31) so as to be slidable in the front-rear direction passing through the fulcrum, and having a tip portion rotatably connected to the front projecting arm (26);
A lifter for a stationary wheelchair (1) comprising a nut / screw type linear motion mechanism for converting the rotation of the rotary actuator (35) into a sliding motion of the slide shaft (36). In claim 3,
The raising / lowering turning mechanism (14A)
A rotary actuator (41);
A gear-type transmission mechanism (42, 43) for transmitting the output rotation of the rotary actuator (41) to the link node at the lower end of the front turning link (12) or the rear turning link (13); A lift for wheelchairs (1) characterized by that. In claim 3,
The raising and lowering turning mechanism is
A pivot bracket (31) supported so as to be pivotable in the vertical direction around a fulcrum (32) located between the front pivot link and the rear pivot link;
A hydraulic cylinder mounted on the pivot bracket;
A lifter (1) for an installed wheelchair, characterized in that the distal end of the telescopic rod of the hydraulic cylinder is rotatably connected to the front projecting arm (26) or the rear projecting arm (27).

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