JP4153147B2 - lift - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lift for a vehicle used for raising and lowering a wheelchair or the like.
[0002]
[Prior art]
A conventional lift is shown in FIGS.
As shown in FIG. 13, the opening 2 of the vehicle 1 is provided with a lift 3 for raising and lowering a wheelchair and the like.
The lift 3 includes a platform 5, a link mechanism 6 connected to the platform 5, a drive mechanism 7 that moves the link mechanism 6, and a main body 8 that stores the platform 5.
[0003]
As shown in FIG. 14, the conventional lift constructed as described above places the wheelchair 4 on the platform 5 in contact with the ground.
When the wheelchair 4 is placed on the platform 5 as described above, the link mechanism 6 is moved by the drive mechanism 7 to lift the platform 5 vertically as shown in FIG.
When the platform 5 is lifted to the top, it is moved horizontally and the wheelchair 4 is stored in the vehicle 1 together with the platform 5.
On the contrary, when the wheelchair 4 stored in the vehicle 1 is lowered to the ground, first, the platform 5 is horizontally moved to the position shown in FIG. Thereafter, the platform is lowered vertically.
As described above, this conventional lift performs the horizontal movement and the vertical movement of the platform 5 separately.
[0004]
[Problems to be solved by the invention]
As shown in FIG. 15, the conventional lift raises and lowers the platform 5 at a position farthest from the vehicle 1.
When the platform 5 is raised and lowered at a position away from the vehicle 1 in this way, the moment acting on the link mechanism 6 increases, so the output of the drive mechanism 7 must be increased accordingly.
However, when the output of the drive mechanism 7 is increased, the drive mechanism 7 is also increased in size. Thus, when the drive mechanism 7 is enlarged, not only the cost is increased, but it is difficult to secure an installation space, and further, there is a problem that the weight is increased.
[0005]
On the other hand, when the platform 5 is lifted up to the uppermost position at a position farthest from the vehicle 1, there is a high possibility that the head of a person sitting in the wheelchair 4 will hit the tip of the rear hatch 9 of the vehicle 1.
An object of the present invention is to provide a lift that can reduce the size of a drive mechanism that raises and lowers a platform and that prevents the head of a person sitting in a wheelchair 4 from hitting the rear hatch 9 of the vehicle 1.
[0006]
[Means for Solving the Problems]
According to a first aspect of the present invention, a pair of outer guides arranged on the left and right sides of the opening of the vehicle, a pair of inner guides provided inside the outer guides and movable along the outer guides, and the inner guides. A platform that is extended and movable along the inner guide and the outer guide, a linkage mechanism that links the platform and the inner guide, and a drive mechanism that applies a thrust or a pulling force according to the moving direction of the platform And a turning mechanism for turning the inner guide at a predetermined position, and when the platform is given a thrust or a pulling force by the drive mechanism, the platform moves horizontally with the inner guide linked by the linkage mechanism. When the inner guide reaches a predetermined position The pivot mechanism turns the base end side as a fulcrum and keeps the tip tilted downward, and along this tilted inner guide, the platform is released from the linkage with the inner guide by the linkage mechanism. The platform is configured to move up and down while being supported in a horizontal state.
[0007]
According to a second aspect, in the first aspect, the drive mechanism is configured by a push chain, a sprocket engaged with the push chain, and a motor that rotates the sprocket.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
1 to 12 show an embodiment of the present invention.
As shown in FIG. 1, a lift R is provided in the rear opening 11 of the vehicle 10. The lift R includes a main body 12 fixed to the vehicle 10, a pair of inner guides 13 and 13 linked to the main body 12, and a platform 14 linked to the inner guides 13 and 13.
As shown in FIG. 2, the main body 12 includes a pair of left and right outer guides 15, 15. In the outer guides 15 and 15, the inner guides 13 and 13 and the platform 14 can be stored as shown in FIG.
[0009]
As shown in FIG. 4, the outer guides 15 and 15 are provided with a lower rail 16 and an upper rail 17, and an intermediate rail 18 is provided between the rails 16 and 17.
A stopper 19 is formed on the top surface on the front end side of the lower rail 16. The intermediate rail 18 is provided with an inclined portion 20. The inclined portion 20 and the stopper 19 constitute a rotation mechanism of the present invention, and the function thereof will be described in detail later.
[0010]
Chain guides 21 and 21 are provided on the outer guides 15 and 15. The chain guides 21 and 21 guide the push chains 22 and 22.
For example, as shown in FIGS. 5 and 6, the push chains 22 and 22 are formed by connecting a plurality of outer members 23 and a plurality of inner members 24 provided on the inner side thereof by pins 25.
[0011]
As shown in FIG. 6, the outer member 23 and the inner member 24 include a convex portion 26 and a rotation restricting surface 27 at the upper portion thereof, and the tip of the convex portion 26 of one member is the rotation restricting of the other adjacent member. It abuts on the surface 27. In such a state, the push chain 22 is kept straight.
The push chain 22 made in this way bends downward in the drawing with the pin 25 as a fulcrum, but does not bend on the opposite side. This is because the relative rotation between the convex portion 26 and the rotation restricting surface 27 is restricted.
[0012]
As shown in FIG. 2, the push chain 22 is fixed at one end to the connecting portion 47 of the platform 14 and the other end is housed in the chain cassette 31 via the driven sprocket 29 and the drive sprocket 30. I have to.
The drive sprocket 30 is fixed to the rotating shaft of the electric motor M, and rotates by the operation of the electric motor M. The push chain 22 moves in accordance with the rotational direction of the drive sprocket 30 so as to apply a thrust force or a pulling force to the platform 14.
The push chain 22, the driven sprocket 29, the drive sprocket 30, and the electric motor M constitute a drive mechanism of the present invention.
[0013]
On the other hand, as shown in FIG. 4, the inner guides 13 and 13 are composed of a base end portion 13a and a straight portion 13b, and first and second rollers 32 and 33 are rotatably attached to the side surfaces of the base end portion 13a. ing.
These first and second rollers 32 and 33 are, as shown in FIG. 3, when the inner guides 13 and 13 are stored in the outer guide 15 as shown in FIG. And is guided by. And it is made movable in a horizontal direction, maintaining this guided state.
In the illustrated state, the first and second rollers 32 and 33 are supported by the lower rail 16 and the intermediate rail 18 so that the straight portion 13b of the inner guide 13 is kept horizontal.
[0014]
As described above, the inner guides 13, 13 supported on the base end portion 13 a side have a downward force acting on the linear portion 13 b side.
Therefore, when the inner guides 13, 13 move rightward from the illustrated state and the second roller 33 reaches the inclined portion 20 of the intermediate rail, the inner roller 13 is pressed against the lower surface of the inclined portion 20, The guides 13 and 13 rotate with the first roller 32 as a fulcrum, and the linear portion 13b starts to fall.
As shown in FIG. 8, when the first roller 32 comes into contact with the stopper 19 and the convex portion 34 fixed to the inner guides 13 and 13 and the regulating piece 35 provided in the outer guides 15 and 15 come into contact with each other, the inner guide 13 and 13 are held at a predetermined angle.
[0015]
That is, when the inner guides 13 and 13 are moved to a predetermined position, the inner rollers 13 and 13 are rotated around the first roller 32 provided on the base end portion 13a side by a rotating mechanism including the stopper 19 and the inclined portion 20 as a fulcrum. The inner guides 13 and 13 are moved to keep the tip inclined downward.
A pin P is fixed to the base end sides 13a and 13a of the inner guides 13 and 13 as shown in FIG. The function of this pin P will be described in detail later.
[0016]
The inner guides 13, 13 are formed with a lower rail 44 and an upper rail 45 with the cross sections of the straight portions 13 b, 13 b being U-shaped. These rails 44 and 45 guide the wheels 39 and 40 provided on the platform 14. Hereinafter, the platform 14 will be described.
As shown in FIG. 4, the platform 14 includes a plate portion 36, side members 37 and 37 fixed to the side surfaces of the plate portion 36, and wheel mounting members 38 and 38 fixed to the side members 37 and 37. Has been.
Then, the first and second wheels 39 and 40 are rotatably attached to the wheel mounting members 38 and 38, and the first and second wheels 39 and 40 are attached to the rails 44 and 45 of the inner guides 13 and 13. Therefore, it tries to guide.
[0017]
The front ends of the push chains 22 and 22 are connected to the mounting members 38 and 38, and thrust and tensile force are applied to the platform 14 by the push chains 22 and 22.
Further, a third wheel 41 is rotatably attached to the side members 37, 37. As shown in FIG. 7, when the platform 14 is stored in the main body 12, the second wheel 40 and the third wheel 41 are guided by the lower rail 16, and the first wheel 39 is guided by the upper rail 17. Guided.
[0018]
Furthermore, first and second linkage plates 42 and 43 having different heights are fixed to the side surfaces of the side members 37 and 37 at a predetermined interval.
As shown in FIG. 3, when the platform 14 is housed in the main body 12 together with the inner guides 13 and 13, as shown in FIG. The pins P provided on the inner guides 13 and 13 side are located.
[0019]
Therefore, when the platform 14 moves rightward from the state shown in the figure, the pin P is pushed rightward by the one linkage plate 42, and the inner guide 13 moves rightward together with the platform 14. On the other hand, when the platform 14 moves leftward, the pin P is pushed leftward by the other linkage plate 43, and the inner guide 13 moves leftward together with the platform 14.
That is, the linkage plate 42, 43 and the pin P constitute a linkage mechanism of the present invention that can be engaged and disengaged.
[0020]
Further, as described above, when the inner guide 13 rotates, the position of the pin P is as shown in FIG. That is, when the inner guide 13 rotates, the position of the pin P becomes higher with respect to the platform 14. The position of the pin P at this time is set to be higher than the upper surface of the connecting plate 42 and lower than the upper surface of the connecting pin 43.
Therefore, when the inner guide 13 rotates, the pin P does not contact the connecting plate 42, so that only the platform 14 moves to the right as shown in the figure.
[0021]
Further, when the platform 14 moves leftward from the state shown in the drawing, the connecting plate 43 contacts the pin P, and after this contact, the pin P is pushed leftward. Thus, when the pin P is pushed leftward, the inner guide 13 rotates about the first roller 32 as a fulcrum. That is, the inner guide 13 can be returned to the horizontal position by pushing the pin P to the left by the connecting plate 43.
[0022]
Next, the operation of this embodiment will be described.
First, when the electric motor M is operated from the state shown in FIG. 3, that is, the state where the inner guide 13 and the platform 14 are stored in the main body 12, thrust is applied to the platform 14 by the push chain 22.
At this time, as shown in FIG. 10, the platform 14 and the inner guides 13 and 13 are linked by the pin P and the linkage plate 43, so that the inner guide 13 also moves integrally with the platform 14.
[0023]
When the inner guide 13 moves to the right in FIG. 7 together with the platform 14, the inner guide 13 starts to rotate as described above.
Then, as shown in FIG. 8, when the inner guide 13 moves until the first roller 32 hits the stopper 19, the inner guide 13 is held at a predetermined inclination angle. At this time, the inclination angle of the inner guide 13 is substantially the same as the angle connecting the first wheel 39 and the two wheels 40 provided on the platform 14. The platform 14 can be maintained in a horizontal state by two-point support by the first and second wheels 39 and 49.
Further, as described above, when the inner guide 13 rotates, the rail surface of the lower rail 16 of the outer guide 15 and the lower rail surface 44 of the inner guide 14 coincide, and the upper rail 17 of the outer guide 15 The rail surface and the upper rail surface 45 of the inner guide 14 coincide.
[0024]
Further, when the inner guide 13 rotates as described above, the pin P moves and disengages above the upper surface of the linkage plate 42 as shown in FIG. 11, and thereafter, only the platform 14 moves to the right. Go to. And the 2nd wheel 40 provided in this platform 14 transfers to the lower rail 44 of the inner guide 13 from the lower rail 16 of the outer guide 15 side. At this time, the first wheel 39 also transfers from the upper rail 17 of the outer guide 15 to the upper rail 45 of the inner guide 13.
[0025]
After the platform 14 has completely transferred from the outer guide 15 side to the inner guide 13 side in this manner, the platform 14 descends obliquely downward along the inner guide 13 while maintaining the horizontal state.
In addition, since the inclination angle of the inner guide 13 is the same as the angle connecting the first wheel 39 and the second wheel 40 provided on the platform 14, the platform 14 is moved from the outer guide 15 side to the inner guide 13 as described above. When changing to the side, the platform 14 does not tilt and always remains horizontal.
[0026]
Then, the wheelchair 4 is placed on the plate portion 36 in the state shown in FIG. 1, that is, in a state where the platform 14 is in contact with the ground.
When the wheelchair 4 is placed in this way, when the electric motor M is operated and the push chain 22 is pulled, the first and second wheels 39 and 40 are guided by the inner guide 13 and the platform 14 is kept horizontal. Ascending upward.
Thus, if the platform 14 is raised obliquely upward, the head of the person sitting in the wheelchair 4 will also rise obliquely upward.
Therefore, the head of a person sitting in the wheelchair 4 does not hit the rear hatch 9 of the vehicle as in the conventional case.
[0027]
Further, as shown in FIG. 2, the traveling directions of the push chains 22 and 22 are deflected downward by pulleys 46 and 46 provided on the outer guide. The deflected push chains 22 and 22 are guided in parallel to the inner guide 13, and their tips are fixed to the connecting portion 47 of the platform 14.
Therefore, the pulling force T in the horizontal direction of the push chains 22 and 22 acts on the platform 14 as it is.
[0028]
Here, as shown in FIG. 12, when the total weight of the platform 14 and the loaded load is m, the component force parallel to the inclined surface is a, and the component force perpendicular to the inclined surface is b, the pulling force of the platform 14 T is sufficient if it is equal to or greater than the component force a in the tilt direction. The component force a in the inclination direction is smaller than the total load m.
That is, the same load can be pulled with a smaller force than when lifting in the vertical direction.
Therefore, according to this embodiment, the output of the electric motor M can be made smaller than the case where the platform 14 is lifted in the vertical direction, and the electric motor M can be downsized accordingly.
[0029]
Further, since the platform 14 is configured to roll on the slope by the first and second wheels 39, 40, the frictional force generated by the component force b perpendicular to the slope becomes the rolling frictional force. The rolling friction force is sufficiently smaller than the sliding friction force.
Therefore, according to this embodiment, the platform 14 can be moved smoothly and with a smaller pulling force, and the output of the electric motor M can be reduced accordingly.
[0030]
When the platform 14 is raised along the inner guide 13 and the second wheel 40 is transferred to the lower rail 16 of the outer guide 15, the upper surface of the connecting plate 43 provided on the platform 14 as shown in FIG. However, it comes to a position higher than the pin P of the inner guide 13.
Therefore, when the platform 14 moves leftward from this state, the pin P is pushed leftward by the linkage plate 43, and the inner guide 13 rotates about the first roller 32 as a fulcrum.
[0031]
Accordingly, as the platform 14 moves, the inner guide 13 moves to the left while returning to the horizontal state. As shown in FIG. 7, the platform 14 and the inner guides 13 and 13 are completely stored in the main body 12. Note that when the inner guide 13 returns to the horizontal position, the mounting position of the pin P and the plates 42 and 43 is set so that the pin P fits between the linkage plate 42 and the linkage plate 43.
[0032]
In the above embodiment, the push chains 22 and 22 are used to apply thrust or pulling force to the platform 14, but instead of the push chains, cylinders or the like may be used. In this case, the cylinder that moves the platform 14 in the horizontal direction and the cylinder that moves the platform diagonally along the inner guide 13 may be sequence-controlled.
However, if the push chains 22 and 22 are used as in this embodiment, the pair of push chains 22 and 22 can be driven by a coaxial sprocket. That is, only one electric motor M is sufficient, which is advantageous in terms of cost.
[0033]
【The invention's effect】
According to the first aspect of the invention, since the platform is moved up and down obliquely along the inclined inner guide while supporting the platform in a horizontal state, it is necessary to move up and down as compared with the case where the platform is moved up and down vertically. The power to do can be reduced.
Therefore, the output of the drive mechanism for raising and lowering the platform can be reduced, and the drive mechanism can be reduced in size accordingly.
In addition, since the platform is supported by the tilted inner guide in a horizontal state while being supported horizontally, the head of the person sitting in the wheelchair remains on the vehicle even when the wheelchair is placed on the platform. Don't hit your hatch.
[0034]
According to the second invention, the push chain is configured to apply thrust or tensile force to the platform, so the pair of left and right push chains can be driven by the coaxial sprocket, and the drive mechanism is one. It ’s enough.
[Brief description of the drawings]
FIG. 1 is a side view showing a state in which a lift R according to an embodiment is mounted on a vehicle 1;
FIG. 2 is a perspective view showing an embodiment, and shows a state where the platform 14 is grounded.
FIG. 3 is a perspective view showing the embodiment, and shows a state in which the platform 14 is stored.
FIG. 4 is an exploded view showing a state before an embodiment is assembled.
5 is a plan view of the push chain 22. FIG.
6 is a side view of the push chain 22. FIG.
7 is a schematic diagram for explaining the mechanism of the embodiment, and shows a state in which the platform 14 and the inner guide 13 are stored in the main body 12. FIG.
FIG. 8 is a schematic diagram for explaining the mechanism of the embodiment, and shows a state in which the inner guide 13 is completely rotated.
FIG. 9 is a schematic diagram for explaining the mechanism of the embodiment, and shows a state in which the platform is grounded.
10 is a schematic diagram showing the relationship between the linkage plates 42 and 43 and the pin P, and is a diagram showing a state before the inner guide 13 is rotated. FIG.
11 is a schematic diagram showing the relationship between the linkage plates 42 and 43 and the pin P, and is a diagram showing a state in which the inner guide 13 is rotated. FIG.
FIG. 12 is an explanatory diagram showing a relationship of force when pulling the platform 14;
13 is a perspective view showing a conventional lift 3. FIG.
FIG. 14 is a side view showing a state in which the platform 5 is grounded.
FIG. 15 is a side view showing a state where the platform 5 is raised.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Vehicle 11 Rear part opening part 13 Inner guide 14 Platform 15 Outer guide 19 Stopper 20 which comprises the turning mechanism of this invention The inclination part 22 of the intermediate rail which comprises this turning mechanism The push which comprises the drive mechanism of this invention Chain 29 Driven sprocket 30 constituting the driving mechanism of the present invention Driving sprocket 42 constituting the driving mechanism of the present invention Linking plate 43 constituting the linking mechanism of the present invention Linking plate P constituting the linking mechanism of the present invention Linking of the present invention Pin M constituting mechanism Electric motor constituting drive mechanism of the present invention

Claims (2)

A pair of outer guides arranged on the left and right of the opening of the vehicle, a pair of inner guides provided inside the outer guides and movable along the outer guides, and spanning between the inner guides. A platform that is movable along the guide and the outer guide, a linkage mechanism that links the platform and the inner guide, a drive mechanism that applies a thrust or a pulling force according to the moving direction of the platform, and an inner guide The platform is horizontally moved together with the inner guide linked by the linkage mechanism when given a thrust or pulling force by the drive mechanism, while the inner guide When the position is reached, the rotating mechanism The platform is pivoted about the base end side to keep the tip inclined downward, and the platform released from the linkage with the inner guide by the linkage mechanism is guided along the inclined inner guide. A lift characterized by being configured to move up and down while being supported in a horizontal state. 2. The lift according to claim 1, wherein the drive mechanism is composed of a push chain, a sprocket engaged with the push chain, and a motor for rotating the sprocket.

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