JP2012143260A - Portable slope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable slope having sufficient rigidity while attaining weight reduction in particular regarding the portable slope laid over a step formed between objects and used for traveling of a wheelchair.SOLUTION: The portable slope 1 made of fiber-reinforced resin and laid over the step formed between the objects so as to be used for traveling of the wheelchair integrally includes a slope body 2 of plate shape with its upper face 2a used as a travel surface of the wheelchair, and sidewalls 3 rising from the outside edge of the slope body 2 and extending in the length direction of the slope to prevent a wheel from coming off. The thickness of the slope body 2 is 15-25 mm, and a ratio (h/t) of the height h from the travel surface of the sidewall 3 to the thickness t of the slope body 2 is 2.1-2.9.

Description

  The present invention relates to a portable slope that is used to travel a wheelchair over a step formed between objects, and more particularly to a portable slope that has sufficient rigidity while reducing weight.

  In a building such as a building or a public facility, there may be a step between objects. For example, there is a building in which the doorway is slightly higher than the ground and there is a step between the doorway and the ground. However, it is difficult for wheelchair users to overcome such steps.

  Thus, for example, Patent Document 1 below proposes a portable slope that is foldable and relatively easy to carry. For example, as shown in FIG. 8, the portable slope a can be provided over a step b between objects to provide a flat running surface c on which the wheelchair can run. Moreover, in the portable slope of following patent document 1, the side wall d for preventing a wheel removal is provided in the both-sides edge.

Japanese Patent No. 4090751

  However, the portable slope provided with the side wall for preventing the above-mentioned wheel removal has a length L along the slope of about 2550 mm and has a weight of about 13 kgf (about 127 N). For this reason, although it is portable, an elderly person requires a lot of labor to carry such a slope.

  On the other hand, in order to reduce the weight of the portable slope, it is conceivable to reduce the thickness of each part. However, the thinning of the slope has a problem in strength because the amount of deflection of the slope is increased by the load of the wheelchair.

  As a result of earnest research, the inventors limited the thickness t of the slope body and the height h of the side wall and the slope on the premise that a fiber reinforced resin is used as a material to reduce the weight. When the ratio (h / t) with respect to the thickness t of the main body is limited to a certain range, it has been found that light weight and high rigidity are compatible at a high level, and the present invention has been completed.

  As described above, an object of the present invention is to provide a portable slope that can achieve both weight reduction and high rigidity at a high level.

  The invention according to claim 1 of the present invention is a portable slope made of fiber reinforced resin that is used for traveling a wheelchair over a step formed between objects, and the upper surface of which is a plate-like shape that serves as a traveling surface of the wheelchair. A slope main body and a side wall for preventing the wheel from coming off at the outer edge of the slope main body and extending in the length direction of the slope, and the thickness t of the slope main body is 15 to 25 mm, and the side wall The ratio (h / t) of the height h from the running surface to the thickness t of the slope body is 2.1 to 2.9.

  The invention according to claim 2 is the portable slope according to claim 1, wherein the ratio (h / t) is 2.5 to 2.7.

  The invention according to claim 3 is the portable slope according to claim 1 or 2, wherein the slope body has a length of 2400-2700 mm and a width perpendicular to the length is 700-1100 mm.

  The invention according to claim 4 is the portable slope according to any one of claims 1 to 3, wherein the side wall has a thickness of 5 to 15 mm.

  According to a fifth aspect of the present invention, the slope main body and the side wall are set in a mold in which carbon fibers and / or glass fibers are wound around the surface of a core material made of rigid polyurethane foam, and polyethylene, polyester 5. The portable slope according to claim 1, wherein at least one kind of resin selected from the group of vinyl esters is poured into the mold and integrally molded.

  The portable slope of the present invention is formed using fiber reinforced resin (FRP). Since the fiber reinforced resin has a small specific gravity, the portable slope can be reduced in weight. In the portable slope of the present invention, the thickness t of the slope body is limited to 15 to 25 mm, and the ratio (h / t) between the height h of the side wall and the thickness t of the slope body is 2. It is limited to the range of 1 to 2.9.

  In the conventional portable slope, the ratio (h / t) is generally smaller than 2.0. For this reason, the side wall does not function effectively as a reinforcing rib for increasing the bending or bending rigidity of the slope body. On the other hand, in the present invention, the ratio (h / t) is 2.1 or more, that is, the height of the side wall is remarkably increased as compared with the thickness of the slope body. As a result, when a general wheelchair travels, the side wall effectively functions as a reinforcing rib that suppresses bending or bending of the slope body, and the thickness of the slope body is reduced to 15 to 25 mm to reduce the weight. However, sufficient bending resistance rigidity is ensured. When the ratio (h / t) exceeds 2.9, it is not possible to realize a sufficient weight reduction of the portable slope.

It is a top view of the portable slope of this embodiment. It is the side view seen from the side wall side. (A) is the side view seen from the end in the length direction of a portable slope, (b) is the side view which shows the folded state. FIG. 2 is a perspective view of FIG. 1. (A) is the A section enlarged view of FIG. 2, (b) is the B section enlarged view. It is the C section enlarged view of Drawing 3 (a). It is sectional drawing of FIG. It is a side view which shows the use condition of a slope. It is sectional drawing of the basic structure of the slope of an Example and a comparative example.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 4, the portable slope (hereinafter sometimes simply referred to as “slope”) 1 of the present embodiment spans a step generated between objects having different heights to travel a wheelchair. A plate-shaped slope main body 2 whose upper surface 2a is a wheelchair running surface, and a pair of anti-wheel-release side walls that rise at the outer edge of the slope main body 2 and extend in the direction of the length L of the slope. 3 and 3 together.

  As shown in FIGS. 1 and 4, the slope main body 2 has a length L extending from one end S1 to the other end S2 along the slope, and a width W that a wheelchair can pass through, and is a substantially rectangular plate. Configured.

  The length L of the slope 1 is not particularly limited, but is preferably 1000 mm or more, more preferably 2000 mm or more, and further preferably 2400 mm or more. When the length L is less than 1000 mm, the traveling surface when the slope is passed may be steep and the usability may be deteriorated. On the other hand, if the length L of the slope 1 is increased, it becomes inconvenient to carry and the weight tends to increase. Therefore, it is preferably 3000 mm or less, more preferably 2700 mm or less. The width W, which is a dimension perpendicular to the length L of the slope 1, is preferably about 700 to 1100 mm.

  In the slope 1 of the present embodiment, as shown in FIGS. 1, 3, and 4, a plurality of slope pieces 1A and 1B arranged in the width direction (in this example, two pieces divided into equal widths) are freely bendable. Are connected by a flexible tape-like elastic sheet material 4. Therefore, as shown in FIG. 3 (b), the pair of slope pieces 1A, 1B can be folded at the side edges facing each other, and in use, as shown in FIG. 3 (a), the slope pieces 1A A traveling surface composed of a substantially continuous plane on which the wheelchair can travel is obtained by unfolding 1B and butting the side edges of each other. In addition, it is desirable that the slope pieces 1A and 1B are provided with, for example, a fastener such as a hook-and-loop fastener for maintaining a folded state, and a handle (both not shown) when folded and transported.

  As shown in FIGS. 5 (a) and 5 (b), one end S1 and the other end S2 of the slope body 2 are each formed in a tapered shape with a gradually decreasing thickness, and are in contact with an object or the ground. The rubber members R1 and R2 for preventing slipping are appropriately fixed. Each rubber member R has a U-shaped cross section and covers the upper and lower ends and the front end portions of the one end S1 and the other end S2 of the slope body 2. In particular, the rubber member R1 mounted on the one end S1 side has a plurality of grooves g extending in the width direction of the slope 1 on the lower surface. This increases the friction with the ground or the like and helps prevent the slope 1 from being displaced.

  The side wall 3 rises substantially vertically at the outer edge of the slope body 2 and extends in the length direction of the slope. Such a side wall 3 is useful for preventing the wheel from coming off from the slope body 2 when the upper surface 2a of the slope body 2 is run on a wheelchair.

  The side wall 3 is not necessarily formed over the entire length of the slope body 2. Preferably, as shown in FIG. 4, the ratio (LW / L) of the length LW of the side wall 3 to the length L of the slope 1 is preferably 0.1 or more, more preferably 0.50 or more, and even more preferably. Is preferably 0.70 or more, more preferably 0.80 or more. In particular, the side wall 3 does not have to be formed in a predetermined length range from each of the one end S1 and the other end S2 of the slope body 2. The predetermined length is desirably 10% or less of the length L, for example.

  Further, the slope 1 needs to have sufficient strength to be able to withstand even when a wheelchair passes over the slope 1 when it is passed over a step. Specifically, it is necessary to pass at least a load bearing test, a deflection amount and an endurance test based on JIS T9207 “Portable Slope for Wheelchairs”. In order to satisfy such an endurance test while reducing the weight, a fiber reinforced resin is employed in the slope 1 of the present invention. The fiber reinforced resin is particularly preferable as a material for the slope body 2 because it is lightweight and has high strength.

  FIG. 7 shows a schematic sectional view of such a slope 1. The slope 1 includes, for example, a core material 6 having a rectangular cross section extending in the slope length direction, reinforcing fibers 7 wound around the core material 6, and a matrix resin 8 that solidifies and holds these integrally. ing.

  For the core material 6, for example, a foam such as hard polyurethane is preferably used from the viewpoint of weight reduction.

  Examples of the reinforcing fibers 7 include carbon fibers, glass fibers, boron fibers, alumina fibers, potassium titanate fibers, silica fibers, zirconia fibers, and other inorganic fibers, wholly aromatic polyamide fibers, wholly aromatic polyester fibers, and ultrahigh molecular weights. Organic fibers such as polyethylene fiber, high-strength vinylon fiber or high-strength acrylic fiber, whiskers such as graphite, silicon nitride, or potassium titanate are preferably used. Especially, it is preferable from a viewpoint of production technology to use carbon fiber or glass fiber.

  The reinforcing fibers 7 may be arranged substantially parallel to the slope length direction and / or in the width direction. In particular, when these arrangements are combined, it is desirable in that the bending strength and the surface pressure resistance as a whole of the slope are further improved.

  Examples of the matrix resin 8 include thermosetting resins such as polyester, epoxy, phenol or polyimide, polyamide, polycarbonate, polypropylene, polybutylene terephthalate, polyphenylene sulfide, polyethersulfone, polyetheretherketone or polyamideimide. A thermoplastic resin can be suitably used. Especially, it is preferable from a viewpoint on intensity | strength and a production technique to use at least 1 or more types of resin which consists of a group of polyethylene, polyester, and vinyl ester.

  In manufacturing, a prepreg in which the uncured matrix resin 8 and the reinforcing fibers 7 are combined in advance in a sheet shape may be used.

  In the slope 1 of the present embodiment, the slope main body 2 and the side wall 3 are integrally formed as shown in FIGS. 6 and 7 which are enlarged views of a portion C in FIG. Such a slope 1 is obtained by, for example, winding a reinforcing fiber 7 around the surface of a core material 6 made of hard foamed polyurethane or the like and setting it in a mold, and then pouring the matrix resin 8 into the mold and curing it. Obtainable. Moreover, what wound the said prepreg around the surface of the core material 6 which consists of rigid foaming polyurethane can also be shape | molded by setting to a metal mold | die. In the embodiment of FIG. 7, the core material constituting the side wall 3 is placed on the upper surface of the core material of the slope body 2, but it may have a shape extending from the lower surface of the slope body 2 to the upper end of the side wall.

  In the slope 1 of the present invention, the thickness t of the slope body 2 is 15 to 25 mm, and the ratio (h / t) between the height h of the side wall 3 and the thickness t of the slope body 2 is 2.1 to The feature item is 2.9.

  As a result of various experiments conducted by the inventors, in the conventional portable slope, the ratio (h / t) is formed to be smaller than 2.0, so that the side wall 3 increases the bending or bending rigidity of the slope body 2. It has been found that it does not function effectively as a reinforcing rib. Therefore, the inventors conducted experiments by changing the ratio (h / t) in various ways. As a result, the ratio was set to 2.1 or more, that is, the side wall compared to the thickness t of the slope body 2. In order to complete the present invention, it is found that the side wall 3 can be effectively functioned as a reinforcing rib that suppresses bending or bending of the slope body 2 by remarkably increasing the height h of 3 as compared with the prior art. It has come.

  In such a slope 1, the thickness t of the slope main body 2 is reduced to 15 to 25 mm to reduce the weight, but sufficient bending resistance is ensured even when a general wheelchair travels. Therefore, according to the present invention, there is provided a portable slope 1 that is light in weight and excellent in portability and has sufficient rigidity.

  Here, if the thickness t of the slope main body 2 is less than 15 mm, sufficient deflection rigidity cannot be obtained even if the height of the side wall 3 is increased. Conversely, if the thickness t of the slope body 2 exceeds 25 mm, weight reduction cannot be realized. In particular, the thickness t of the slope body 2 is preferably 16 mm or more, more preferably 17 mm or more, and preferably 24 mm or less, more preferably 20 mm or less.

  In this embodiment, the thickness t of the slope main body 2 is constant except for the end portions S1 and S2 on both sides forming a tapered portion. The thicknesses of the end portions S1 and S2 of the slope body 2 are not included in the thickness t. The length Le in the slope direction of each of the end portions S1 and S2 is preferably 10% or less of the length L of the slope 1 as described above.

  Further, if the ratio (h / t) is less than 2.1, the side wall 3 cannot sufficiently reinforce the slope body 2 even if the thickness t of the slope body 2 is ensured within the above range, and is sufficient. High deflection resistance cannot be obtained. On the other hand, if the ratio (h / t) exceeds 2.9, the slope 1 cannot be sufficiently lightened. From such a viewpoint, the ratio (h / t) is more preferably 2.2 or more, further preferably 2.5 or more, and preferably 2.7 or less.

  In addition, if the thickness k of the side wall 3 is too small, the effect of reinforcing the slope main body 2 may not be sufficiently obtained. Therefore, the thickness k is preferably 5 mm or more, more preferably 8 mm or more. On the other hand, even if the thickness k of the side wall 3 is too large, the weight of the slope 1 may increase. Therefore, the thickness is preferably 15 mm or less, more preferably 12 mm or less. In the present embodiment, the side wall 3 is formed with a substantially constant thickness k. However, a taper (2 to 3%) that is approximately equal to the escape angle of the mold may be provided. In that case, the thickness k is the minimum thickness.

  As mentioned above, although embodiment of this invention was explained in full detail, it cannot be overemphasized that this invention is not limited to the said embodiment, It can deform | transform into a various aspect and can be implemented.

Based on the specifications shown in Table 1, a plurality of types of portable slopes having the basic structure shown in FIGS. A detailed cross section is shown in FIG. The slope is obtained by coating a core material made of foamed polyurethane with a glass fiber layer and further coating with a carbon fiber layer on the outside thereof. For each fiber layer, a prepreg obtained by impregnating fibers with uncured resin was used. And this molded object was thrown into the metal mold | die, and the slope main body and the side wall were integrally press-molded, and each slope piece was manufactured. Moreover, the slope piece was connected so that folding was possible with the tape-shaped nylon cloth. Furthermore, a rubber member was fixed to the tip of each slope piece with an adhesive, and a portable handle (made of nylon resin) was attached with a rivet. Detailed specifications are as follows.
Slope length L: 2550 (mm)
Slope width W: 390 mm x 2 + intermediate gap 5 mm = 785 (mm)
Tensile modulus of carbon fiber: 24 (GPa)
Tensile modulus of glass fiber: 24 (GPa)
Direction of each fiber (angle with respect to the slope length direction): Laminated structure of 0 °, 22 °, and 45 ° Fiber compounding ratio (carbon: glass) = 3: 1
127mm width of each core material built in the slope body
In addition, since three core materials are used for the slope body, the total width of the core material of the slope piece is 127 (mm) × 3 = 381 (mm), and 9 mm is the total width of the fiber reinforced resin. Become.

  The weight of each slope was measured, and the load resistance, deflection amount, durability performance, and fixing performance of each slope were measured in accordance with JIS T 9207 “Portable Slope for Wheelchairs”. The test was performed after applying a weight of 300 kg and passing for 1 minute.

The acceptance criteria for the test results are as follows.
(1) Deflection amount: 3.5 ° or less (2) Load resistance: 200 kg or more (3) Weight: 12.5 kgf or less The test results are shown in Table 1.

  As a result of the test, it was confirmed that the slope of the example had a significant effect of providing sufficient rigidity while reducing the weight.

  Next, the same experiment was performed by setting the slope body thickness to 15 mm, 20 mm, and 25 mm, and changing the height h of the side wall. The results are as shown in Tables 2-4.

  As a result of the test, when the thickness of the slope body was set to 15 to 25 mm, a significant effect of providing sufficient rigidity while reducing the weight was confirmed.

1 Portable slope 2 Slope body 3 Side wall t Slope body thickness h Side wall height

Claims (5)

A portable slope made of fiber reinforced resin that is used to run a wheelchair across a step formed between objects,
A plate-like slope main body whose upper surface is the running surface of the wheelchair, and a side wall for preventing wheel removal that rises at the outer edge of the slope main body and extends in the length direction of the slope,
The slope body has a thickness t of 15 to 25 mm;
And the ratio (h / t) of the height h from the running surface of the said side wall and the thickness t of the said slope main body is 2.1-2.9, The portable slope characterized by the above-mentioned.   The portable slope according to claim 1, wherein the ratio (h / t) is 2.5 to 2.7.   3. The portable slope according to claim 1, wherein the slope body has a length of 2400 to 2700 mm and a width perpendicular to the length of 700 to 1100 mm.   The portable slope according to any one of claims 1 to 3, wherein the side wall has a thickness of 5 to 15 mm.   The slope body and the side wall are selected from the group consisting of polyethylene, polyester, and vinyl ester by setting a surface of a core material made of rigid foamed polyurethane with carbon fiber and / or glass fiber wound around a mold. The portable slope according to any one of claims 1 to 4, wherein at least one kind of resin is poured into the mold and integrally molded.

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