JP2019182126A - Stair lift mechanism - Google Patents

Abstract

To provide a stair lift mechanism that is simply configured and light-weight and that can move with a small force when moving over steps of stairs.SOLUTION: A step lift mechanism configured to move up and down steps of stairs is structured such that one end of each of rotation cranks 3 is rotatably fitted to a lower end of each of frames 2 extending and retracting in a vertical direction and that a center shaft 6 of each of wheels 5 is rotatably fitted to the other end of each of the rotation cranks 3. Thus, the frames 2 and the wheels 5 are rotatably connected via the rotation cranks 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stair lift mechanism that includes traveling wheels and can move with a small force when a step portion of a stair is exceeded.

  Conventionally, transportation of a patient or a care recipient in a house or the like not equipped with an elevator has been a heavy burden on the caregiver, and in particular, raising and lowering stairs has been a difficult task. Moreover, even when an elevator is provided in a hospital, a house, or the like, the elevator may be disabled in an emergency such as a fire. For this reason, it is required to be able to ascend and descend easily so that patients or care recipients can be quickly transported by a small number of caregivers in hospitals and homes, and various research and development related to stair climbing vehicles are underway. Yes.

  For example, Japanese Patent Application Laid-Open No. 2008-285157 (Patent Document 1) discloses that any stairs can be raised and lowered continuously and smoothly without the need for switching operation such as a clutch operation or various controls, so that the chair and the bed can be kept horizontal. For the purpose of making it automatic without relying on power, and a board that rotates about the main shaft, and a plurality of outer ring bodies that rotate about the support shafts provided at a plurality of peripheral portions of the plate. It is a moving means provided, characterized in that the distance between the main shaft of the outer ring body and the main shaft and the main shaft is gradually increased or decreased. There has been proposed a “car that moves up and down stairs” in which the outer ring body is sequentially grounded and the main shaft moves in a direction away from or closer to the grounding surface.

  Japanese Patent Laid-Open No. 2002-284049 (Patent Document 2) discloses a transport vehicle in which a wheelchair seat and a loading platform are always kept horizontal, and it is possible to continuously travel comfortably on a flat ground and stably move up and down stairs. In order to provide a structure and a traveling method, a vehicle body frame of a transport vehicle having four long wheels is used as a link device of a parallel crank mechanism. Make a comfortable ride and change direction by using a normal wheel attached to its tip. When moving up and down the stairs, the wheel body is tilted up and down according to the inclination of the stairs, but the parallel crank movement of the link device using the difference in height of the front and rear wheel bodies keeps the wheelchair's seat surface and loading platform horizontal and parallel crank movement A "cart that can move up and down stairs" has been proposed that performs mechanically stable lifting with a simple operation of locking or unlocking the door.

  Japanese Patent Laying-Open No. 2012-5762 (Patent Document 3) aims to provide a stair-climbing moving vehicle capable of moving up and down stairs with good stability. When the four link connecting points in the body are in a straight line posture, the posture is parallel to the link in a state based on one of the two links located in the forward direction of the four links. A link rotation drive for rotating the link that maintains the link upward and then rotating it forward to achieve a linear posture, and a linear posture in which the four link connecting points are arranged in a straight line Two links located on the front side in the advancing direction and two links located on the aft side in the advancing direction in a state centered on the two link connecting places that overlap and are located in the middle in the front-rear direction among the four link connected places Rin It is configured "stair-climbing type mobile vehicles" has been proposed to make the link bending drive to bending and stretching operation of the door.

JP 2008-285157 A JP 2002-284049 A JP 2012-5762 A

   However, the above-described prior art has a problem that it is generally unsuitable for mounting because the structure is complicated and the number of parts increases and the weight increases. Therefore, the present invention has been developed by the inventors of the present invention in view of such problems, the structure is simple and lightweight, and can move with less force when exceeding the stepped portion of the stairs, It is an object of the present invention to provide a stair lift mechanism that can be kept almost horizontal even when a spiral staircase is lifted or lowered.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a stair lift mechanism configured to be capable of moving up and down a step portion of a stair, and has one end of a rotating crank at a lower end portion of a frame extending vertically. The frame is pivotally attached to the other end of the rotary crank, and the center axis of the wheel is pivotally attached to the other end of the rotary crank so that the frame and the wheel are rotatably connected via the rotary crank. It is characterized by that.

  According to a second aspect of the present invention, the radius of the wheel according to the first aspect is set to be larger than a distance between pivots of the rotating crank, and the diameter of the wheel is set to be smaller than that of the frame. It is characterized by being set to be smaller than the length.

  The invention according to claim 3 is characterized in that the radius of the wheel according to claim 1 or 2 is set equal to or higher than the height of the stepped portion.

  According to a fourth aspect of the present invention, when the rotating crank according to any one of the first to third aspects of the present invention is rotated in the same direction as the traveling direction when ascending, or in the direction opposite to the advancing direction when descending. Brake means for applying resistance when rotating is provided.

  According to a fifth aspect of the present invention, the frame according to any one of the first to fourth aspects, the rotating crank, and the wheel are provided in a pair of left and right with respect to the traveling direction, and the left and right rotating cranks are independently provided. And connected to rotate.

  According to a sixth aspect of the present invention, there is provided a rotation stopping means for stopping the rotation of the rotary crank according to the first to fifth aspects with respect to the frame, and a wheel stopping means for stopping the rotation of the wheel. A brake mechanism comprising a seesaw crank for connecting the rotation stop means and the wheel stop means, and a brake wire connected to the rotation stop means, and the rotation of the rotation crank and the wheel is controlled by operation of the brake wire. It is characterized by stopping at the same time.

  As described above, according to the present invention, since the frame and the wheel are rotatably connected via the rotating crank, the structure is extremely simple and the weight can be reduced.

  Further, since the radius of the wheel is set to be equal to or higher than the height of the stepped portion, the wheel can be moved with a small force when exceeding the stepped portion of the staircase.

  In addition, safety is improved by providing brake means that resists when rotating in the same direction as the traveling direction when the rotating crank is raised or when rotating in the opposite direction to the traveling direction when descending. .

  Further, by providing a pair of left and right stair climbing mechanisms according to the present invention, it is possible to move with a small force even when exceeding the stepped portion of the spiral staircase and to keep it almost horizontal. .

It is (a) front view, (b) side view, (c) top view which shows an example of the stair raising / lowering mechanism concerning this invention. It is explanatory drawing which shows the dimensional relationship of the stair raising / lowering mechanism of FIG. It is explanatory drawing which shows rotation operation | movement of the stair raising / lowering mechanism concerning this invention. It is explanatory drawing which shows a stair raising / lowering state. It is an external view which shows the raising / lowering state in a spiral staircase. It is explanatory drawing which shows the raising / lowering state in a spiral staircase. It is explanatory drawing which shows an example of a brake mechanism. It is sectional drawing which shows the rotation stop means of the brake mechanism shown in FIG. It is sectional drawing which shows the wheel stop means of the brake mechanism shown in FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, about each structure of the stair raising / lowering mechanism concerning this invention, it is not limited to a following example, It can change suitably with a use condition.

  FIG. 1: is (a) front view, (b) side view, and (c) top view which show an example of the stair raising / lowering mechanism concerning this invention.

  As shown in FIG. 1, the stair lift mechanism 1 includes a frame 2 that extends in the vertical direction, a rotating crank 3, and wheels 5. At the lower end of the frame 2, one end of the rotating crank 3 is pivotally mounted by a pivot (for example, a bolt and a nut) 7, and the center shaft 6 of the wheel 5 is attached to the other end of the rotating crank 3. A pivot (for example, a bolt and a nut) 4 is pivotally attached to the pivot. As described above, the stair lift mechanism 1 has a basic configuration in which the frame 2 and the wheel 5 are rotatably connected via the rotating crank 3. Also, as shown in FIG. 1, by providing a pair of left and right frames 2, rotating cranks 3 and wheels 5 with respect to the traveling direction, the left and right rotating cranks 3 rotate independently.

FIG. 2 is an explanatory diagram showing a dimensional relationship of the stair lift mechanism of FIG.
As shown in FIG. 2, the radius (R) of the wheel 5 is set to be larger than the distance (H2) between the pivots of the rotating crank 3. The diameter (D) of the wheel 5 is set to be smaller than the length (H1) of the frame 2. Further, the radius (R) of the wheel 5 is set equal to or higher than the height (H3) of the step portion. Thereby, when it exceeds the level | step-difference part of a staircase, it can move with little force.

FIG. 3 is an explanatory view showing the rotation operation of the stair lifting mechanism according to the present invention.
First, as shown in FIG. 3 (a), when the wheel 5 hits the stepped portion of the stairs, the rotating crank 3 is moved from the vertical state to the direction opposite to the traveling direction by pulling the frame 2 in the traveling direction (in the drawing, Rotate counterclockwise) and the frame 2 moves upward. At this time, the wheel 5 is still stationary before the step.
Next, as shown in FIG. 3B, by further pulling the frame 2 in the traveling direction, the rotating crank 3 rotates in the same direction as the traveling direction (clockwise in the drawing), and at the same time, the wheels 5 move in the traveling direction. Rotate to rise and exceed the step.
Finally, as shown in FIG. 3C, the rotating crank 3 returns to the vertical posture and enters a normal stationary or running state.

FIG. 4 is an explanatory diagram showing the stair climbing state.
(1) Ascent of stairs S1 Normal stationary and running state S2 When the wheel 5 hits an obstacle such as a stairs, the frame 2 moves in the traveling direction, and the wheel 5 is still stationary before the step S3 By pulling the frame 2 in the traveling direction, the wheel 5 rotates and rises around the rotating crank 3 attached to the frame 2 side. (2) Down the stairs S4 Normal stationary and running state S5 Stairs, etc. When the wheel 5 passes through the obstacle, the wheel 5 moves in the traveling direction, and the frame 2 is still stationary before the step S6. The rotating crank 3 attached to the frame 2 side by pulling the frame 2 in the traveling direction as it is. The frame 2 rotates and descends around the center

FIG. 5 is an external view showing the up and down state in the spiral staircase, and FIG. 6 is an explanatory view showing the up and down state in the spiral staircase.
As shown in FIGS. 5 and 6, the stair lift mechanism 1 includes a frame 2, a rotating crank 3, and wheels 5 that are paired on the left and right with respect to the traveling direction, so that the left and right rotating cranks 3 rotate independently. As a result, even when the stepped portion of the spiral staircase is exceeded, it can be moved with a small force similarly to the stepped portion of the normal staircase, and can be kept substantially horizontal.

  In addition, the brake means (not shown) that resists when rotating in the same direction as the traveling direction when the rotating crank 3 is raised or when rotating in the opposite direction to the traveling direction when descending is shown in FIG. When the rotating crank 3 rotates in one direction (counterclockwise in the drawing) as shown in (S2, S5), the rotational resistance does not work, but as shown in FIG. 4 (S3, S6) When rotating in the other direction (clockwise in the drawing), the rotation resistance works.

Further, the stair lift mechanism 1 can include a brake mechanism that simultaneously stops the rotation of the rotating crank 3 and the wheels 5. FIG. 7 is an explanatory view showing an example of a brake mechanism.
As shown in FIG. 7, the brake mechanism includes a rotation stop unit 8 that stops the rotation of the rotating crank 3 with respect to the frame 2, a wheel stop unit 9 that stops the rotation of the wheel 5, a rotation stop unit 8, and a wheel stop. The seesaw crank 10 is connected to the means 9 and the brake wire 11 is connected to the rotation stopping means 8.
As shown in FIGS. 7 and 8, the brake wire 11 is inserted into the hollow bolt 81 and bound to one end of the seesaw clamp 10, and the brake pad 83 is fixed to the frame 2 by pulling the brake wire 11. Contacting 85 stops rotation. At the same time, as shown in FIG. 9, the other end of the seesaw clamp 10, one end of which is bound to the brake wire 11, presses the pivot 4 (center shaft 6) of the wheel 5 via the center fulcrum. The pad 92 comes into contact with a brake disc 93 fixed to the tire wheel 51 to stop the wheel 5.
Thus, by operating the brake wire 11, the rotation of the rotating crank 3 is stopped by the brake pad 83 and the brake disc 85, and the rotation of the wheel 5 is stopped by the brake pad 92 and the brake disc 93 via the seesaw clamp 10. And braking becomes possible.
Since the depth is increased by the seesaw clamp 10 or the like, the tire wheel 51 is offset to the outside and the brake relationship is stored in the wheel (see FIG. 9).

  The stair lift mechanism according to the present invention is simple and lightweight, and does not need to be charged without using electric power, so it can be used in any situation, so it can be used not only for nursing care but also for lifting articles etc. Is possible. For example, it can be used for a stretcher, a wheelchair, a carry, etc., and has industrial applicability.

1 Stair Lifting Mechanism 2 Frame 3 Rotating Crank 4 Axis 5 Wheel 51 Tire Wheel 6 Center Axis 7 Axis 8 Rotation Stopping Means 81 Hollow Bolt 82 Washer 83 Brake Pad 84 Coil Spring 85 Brake Disc 9 Wheel Stopping Means 91 Washer 92 Brake Pad 93 Brake Disc 10 Seesaw crank 11 Brake wire

Claims (6)

A stair raising / lowering mechanism configured to be capable of moving up and down a stepped portion of a stair, wherein one end of a rotating crank is pivotally attached to a lower end of a frame extending in a vertical direction, and at the other end of the rotating crank A stair-climbing mechanism characterized in that a center axis of a wheel is pivotally attached and the frame and the wheel are rotatably connected via the rotary crank. 2. The radius of the wheel is set to be larger than a distance between pivots of the rotating crank, and the diameter of the wheel is set to be smaller than the length of the frame. The stair lift mechanism described in 1. The stair lift mechanism according to claim 1 or 2, wherein a radius of the wheel is set equal to or higher than a height of the stepped portion. 2. The brake device according to claim 1, further comprising a brake unit that applies resistance when rotating in the same direction as the traveling direction when the rotating crank is raised or rotating in the opposite direction to the traveling direction when descending. The stair lift mechanism according to any one of claims 3 to 4. 5. The frame, the rotating crank, and the wheel are provided in a pair of left and right with respect to a traveling direction, and the left and right rotating cranks are connected to rotate independently of each other. The stair climbing mechanism according to any one of the above. Rotation stopping means for stopping rotation of the rotating crank with respect to the frame, wheel stopping means for stopping rotation of the wheel, seesaw crank for connecting the rotation stopping means and the wheel stopping means, and the rotation stopping means A brake mechanism comprising a brake wire connected to the brake wire is provided, and the rotation of the rotating crank and the wheel is simultaneously stopped by the operation of the brake wire. The stair lift mechanism described.