JP2010089586A - Multi-stage sliding slope apparatus for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slide construction effectively improving stability of a wheel chair and the like getting on and off a vehicle in a slope apparatus for a vehicle which unfolds by sliding substantially in three or more stages and the slope apparatus for a vehicle using the same. <P>SOLUTION: A slide slope is substantially formed with three stages including a first slope rotatably articulated with the vehicle at its base end, a second slope that slidingly unfolds and contracts with respect to the first slope, and a third slope that slidingly unfolds and folds with respect to the second slope, wherein, assuming the section moduluses of a pair of first slide rails, second slide rails and third slide rails respectively provided on both sides in the width direction of the first slope, the second slope and the third slope as Z<SB>1</SB>, Z<SB>2</SB>and Z<SB>3</SB>, they are in relation of Z<SB>2</SB>≥Z<SB>1</SB>, Z<SB>2</SB>>Z<SB>3</SB>. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle slope device that can be stored in a vehicle during storage, slides and unfolds outside the vehicle during use, and forms a slope between the floor of the vehicle and the ground, and in particular, a wheelchair or the like can get on and off the top surface of the slope. The present invention relates to a multi-stage slide slope device that is excellent in bending rigidity.

2. Description of the Related Art A vehicle slope device that expands outside a vehicle and forms a slope when getting on and off the vehicle with a wheelchair or the like is used.
In this type of slope device, when storing in the vehicle, the space occupied by the floor is reduced, folded to secure the rear view, or stored in a slide, and stood inside the back door, etc. Are known.
In the past, the type of folding the two slopes, the first slope and the second slope, or a type that slide-stored was used, but in recent years the height has been increased when stood up to improve the rear visibility of the vehicle. There is a high demand for dividing into three or more multistages in order to ensure ease of getting on and off a wheelchair or the like by using a low slope angle during deployment and use.

However, if the slope is divided, the load tends to concentrate on the connecting part of the divided slope, and if it bends so that it bends from this connecting part, the slope of the slope surface will be refracted in the middle and the getting on and off of the wheelchair will deteriorate. For example, an example of a conventional two-stage sliding slope will be described with reference to FIG. 4. The second slope is slidably housed inside the slide rails 111 provided on both sides of the first slope 110 in the width direction. When the slide rails 121 on both sides in the width direction of 120 are provided, the load at the time of getting on and off of a wheelchair or the like is concentrated on the connecting portion, and is bent so as to be bent at the connecting portion as indicated by a dotted line.
When the slope is further divided into three stages, for example, as shown in FIG. 5, a pair of first slide rails 201 are provided on both sides in the width direction of the first slope on the vehicle side, and the inside of the first slide rail is inside. The second slide rail 202 of the second slope is provided so as to be housed in the second slide, and the third slide rail 293 of the third slope is provided so as to be housed inside the second slide rail. Easy to store without standing up, easy to store upright.
In this case, according to the conventional design concept, the slope width on the vehicle side is the widest, so that the slide rail is designed such that the rigidity of the slide rail is first slide rail> second slide rail> third slide rail.
In such a slide structure, the load concentrates on the connecting portions on both sides of the second slide rail in the boarding / exiting direction, but it is bent at the connecting portion between the second slide rail and the third slide rail having the weakest connection strength. The deformation becomes the largest, and the slope of the slope surface is greatly refracted at this portion, and the running performance of a wheelchair or the like is deteriorated.
Therefore, if the strength of the third slide rail 203 is to be secured, the cross sections of the first and second slide rails are increased, the weight of the entire slope device is increased, and the center of gravity is moved to the vehicle base end side. , Deployment operability is poor.
On the other hand, if the entire weight is reduced, the rigidity of the third slope becomes insufficient.

  Patent Documents 1 and 2 disclose a three-stage slide slope as an example, but in both cases, the size of the slide rail from the vehicle side is as follows: first slide rail> second slide rail> third slide rail. The above problems are inherent because they become smaller in order.

JP 2001-276133 A JP 2003-126151 A

  An object of the present invention is to provide a slide structure effective for improving the stability of getting on and off a wheelchair or the like in a vehicle slope device that slides and expands substantially in three or more stages, and a vehicle slope device using the slide structure. And

The vehicle slope device according to the present invention includes a first slope having a base end rotatably connected to the vehicle side, a second slope that slides and expands relative to the first slope, and the second slope. A pair of first slide rails provided on both sides of each of the first slope, the second slope, and the third slope in a substantially three-stage slide slope having a third slope that slides and expands. , Where the section coefficients of the second slide rail and the third slide rail are Z ₁ , Z ₂ , and Z ₃ in this order, Z ₂ ≧ Z ₁ , Z ₂ > Z ₃ .

Here, what is expressed as a sliding slope having substantially three steps is, for example, that a grounding panel is provided at the tip of the slope development side, and formally composed of four or more steps. This means that the present invention is included in the present invention as long as the slope that bears the loading load for a wheelchair or the like is substantially divided into three.
Moreover, in this specification, the direction orthogonal to the slope getting-on / off direction is expressed as a width direction.

In the vehicle slope device according to the present invention, the section coefficient of the second slide rail located in the middle of the three-stage sliding slope is set to be equal to or greater than that of the first slide rail, and more than that of the third slide rail. Since the load is set to be large, the load is effectively distributed to the connecting portion between the first slide rail and the second slide rail and the connecting portion between the second slide rail and the third slide rail. Therefore, since the whole bending becomes small, it is excellent in getting on and off, such as a wheelchair.
Further, it is effective for reducing the weight of the entire slope device and improving the deployment operability.

A slope device according to the present invention will be described below with reference to the drawings.
FIG. 1 shows a state in which the slope device is deployed, and the illustration thereof is omitted, but the proximal end side of the first slope 10 is rotatably attached to the vehicle side using a hinge panel 14 or the like.
The second slope 20 is telescopic with respect to the first slope 10, and the third slope 30 is telescopic with respect to the second slope 20.
More specifically, the first slope 10 has first slide rails 11 on both sides in the width direction.
The second slide rails 21 on both sides in the width direction of the second slope 20 are fitted and slid inside the first slide rail 11.
The third slide rails on both sides in the width direction of the third slope 30 are fitted and slid inside the second slide rail 21.
When storing in the vehicle, the first slope 10, the second slope 20, and the third slope 30 are stored so as to overlap in a triple manner, and stand up with the base end side as a rotation center.

FIG. 2 shows a cross-sectional view of the fitting portion between the slide rails.
The first slide rail 11 forms a protrusion 11a in the inner direction, and a fitting recess 11b is formed so as to sandwich and fit the fitting protrusion 21d provided in the outer direction of the second slide rail 21 from above and below. It is.
A protrusion 21a is formed on the inner side of the second slide rail 21, and a fitting recess 21b is formed so as to sandwich and swallow the fitting protrusion 31a provided on the outer side of the third slide rail 31 from above and below. is there.
Below the first slide rail 11, the second slide rail 21, and the third slide rail 31, there are a first panel 12 of the first slope 10, a second panel 22 of the second slope 20, and a third panel of the third slope 30, respectively. It is fixedly connected to 32 end portions in the width direction.
In this way, by adopting the concave-convex fitting structure with the protrusions in the inner direction formed on the upper part of the slide rail, the thickness of the part where the slide rail fits is increased, and the concave part of the panel mounting part is minimized Can be as thick as possible.

If the section coefficient Z ₁ of the first slide rail 11, the section coefficient of the second slide rail 21 is Z ₂ , and the section coefficient of the third slide rail 31 is Z ₃ , then Z ₂ ≧ Z ₁ , Z ₂ > Z ₃ , The cross section is preferably designed so that Z ₁ > Z ₃ .
Here, the section modulus Z indicates the section modulus on the tensile direction side with respect to the vertical load from the upper surface of the slope panel.
Also, the total height from the bottom surface to the top surface of the first, second, and third slide rails is L1, L2, and L3 in order, the centroids of the sections are sequentially e1, e2, and e3, and the height (distance) from the bottom surface to the centroid. ) Is d1, d2, d3, d1 <L1 / 2, d2 <L2 / 2, d3 <L3 / 2 are set, and d2 <d1 <d3.
Even if the cross-sectional shape of the slide rail is a concave-convex fitting structure and the centroid in the cross-section is set from below, the horizontal direction of the fitting concave portions 11b, 21b of the slide portion and the wall thickness above and below the fitting of the panel By increasing the thickness of the protrusion, even if the slide rail is plastically deformed downward, the fitting portion of the panel connecting the panels is deformed first, and the second slope from the fitting recess of the slide portion, A major trouble that the third slope falls off can be prevented in advance.
As a result, when a load is applied to the slope surface, the maximum tensile stress is generated on the slope bottom surface side, and the overall device can be reduced in weight and rigidity.
In addition, a lubrication mechanism may be provided in the fitting sliding part of each slide rail, or a sliding shoe may be interposed.
With this setting the section modulus, the first coupling portion A ₁ since the flexural rigidity of the second slide rail located in the deployment direction central portion as shown in FIG. 3 is greater than the bending stiffness of the other slide rail second the amount of deflection of the whole since the load on both the connecting portions a ₂ is dispersed is small.
The prototype shown in FIG. 3 and FIG. 4 was manufactured, and when the person pushed the wheelchair on the slope surface and measured the special maximum deflection amount, the two-stage type in FIG. On the other hand, the three-stage type shown in FIG.
For reference, the three-stage commercial product had a maximum deflection of 23 mm.
Moreover, the following effects can be expected if the cross-sectional design of each slide rail described above is such that Z ₂ ≧ Z ₁ , Z ₂ ≧ 2Z ₃ , and preferably Z ₁ ≧ 1.5Z ₃ .
Even if the slope surface is subjected to a load that is higher than expected when it is used, even if it deforms unexpectedly, the breakage occurs in the weakest third slope, so it is possible to slide and store at least the first and second slide rails. Yes, it can be stored in the vehicle, and troubles such as the back door not closing can be prevented.

The external appearance perspective view when developing the slope apparatus which concerns on this invention is shown. The example of a cross-section of the fitting part of each slide rail is shown. Sectional drawing along the boarding / alighting direction of a slope surface is shown. The bending deformation example of a two-stage slope is shown. An example of the structure of a conventional three-stage slide rail is shown.

Explanation of symbols

10 1st slope 11 1st slide rail 20 2nd slope 21 2nd slide rail 30 3rd slope 31 3rd slide rail

Claims (1)

A first slope having a base end rotatably connected to the vehicle side;
A second slope that slides and expands relative to the first slope;
A substantially three-stage sliding slope provided with a third slope that slides and expands relative to the second slope;
Z ₁ , Z ₂ , Z ₃ and the section coefficients of a pair of first slide rail, second slide rail, and third slide rail provided on each side in the width direction of the first slope, the second slope, and the third slope, respectively, Then, the vehicle slope apparatus characterized by having a relationship of Z ₂ ≧ Z ₁ and Z ₂ > Z ₃ .

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