JP6091890B2 - Stair unit - Google Patents

Description

  The present invention relates to a stair unit for installing a stair on a mountain path, a slope of a construction site, or the like in a mountainous area, for example.

Conventionally, for example, in order to install stairs on mountain trails, slopes of construction sites, etc. in mountainous areas, stair units of plastic molded products are connected in series to form stairs. Patent Document 1 is given as an example of a stair unit used for such a stair.
In Patent Document 1, a staircase structure 11 as a staircase unit is a plastic molded product, and is provided with a kicking plate 13 as a kicking plate portion that hangs downward at the front end of a stepping plate 12 as a stepping plate portion, and rises up at the rear end. A protrusion 12b is provided as a plate portion. As shown in FIG. 2, the staircase structure 11 is disposed such that the kick plate 13 of the staircase structure 11 disposed above the staircase structure 11 is in contact with the front surface of the ridge 12 b of the staircase structure 11. Are connected (connected) in series to form a staircase.

Japanese Patent Laying-Open No. 2003-262021

By the way, in the staircase structure 11 of Patent Document 1, a large number of recesses 16 are formed on the back side of the kick plate 13 in order to reduce the weight. In this way, the stealing of the portion of the concave portion 16 can reduce the amount of light that has been stolen. In addition, the compression strength in the vertical direction is often improved by forming a rib extending in the vertical direction on the back side of the kick plate instead of the concave portion 16.
However, shaving only one side of the front and back in this way often causes warping of the member. In particular, the problem of warpage is significant when forming into a thin wall. Further, unlike the tread board, the kick board is not restricted on the lower side and is a member that is likely to warp.
For example, as the warpage assumed for the kick plate here, as shown in FIG. 8, the warp is curved outwardly in the front, rear, left and right as a whole, and particularly the corners on both sides near the lower end of the kick plate are the largest and warped back. It is like that. The cause of warpage is caused by the internal stress generated mainly due to the different solidification speeds on the front and back sides (in this case, the periphery of the recess 16 is solidified first, so that the back side is generally faster than the front side). That is why.
For this reason, there has been a demand for a technique that does not cause the kick plate to be warped while forming a shape such that the kick plate such as a recess or a rib becomes an uneven surface on the kick plate of the stair unit.

In order to achieve the above object, in the invention described in means 1, the tread plate portion formed by integral molding of plastic and formed in a flat plate shape, and having the same width as the tread plate portion and downward from the front end side of the tread plate portion. A kick plate portion that hangs down, and a rise plate portion that has the same width as the tread plate portion and rises upward from the rear end side of the tread plate portion, at least the vertical width of the rise plate portion is greater than the vertical width of the kick plate portion A staircase unit configured not to be widened, wherein a plurality of grooves and ridges extending in the vertical direction on the front and back surfaces of the kick plate portion are alternately arranged along the left-right direction to form an uneven surface. The gist of the present invention is that the thickness of the kick plate portion is made constant by forming and arranging the groove portions and the flange portions at positions where the front and back surfaces are back to back so that the concavo-convex relationship is alternated. .
In such a configuration, since the plurality of groove portions and the flange portions are alternately arranged along the left-right direction in the kick plate portion and have an uneven surface, the same cross-sectional area when such an uneven surface is not provided Therefore, the compressive strength in the vertical direction is improved as compared with the kick plate portion. In addition, although the uneven surface is formed, the thickness of the kick plate portion is configured to be constant, so that the problem of warpage is solved.

Here, in the case of “a plurality of grooves and ridges extending in the vertical direction”, the vertical direction may be a complete vertical direction, but it is intended to include cases where there is an angle in the vertical direction. . In addition, when referring to “a plurality of groove portions and flange portions”, they may be either the same shape or different shapes as long as the thickness of the kick plate portion is configured to be constant.
The terms “front end side of the tread plate portion” and “rear end side of the tread plate portion” are intended to include not only the front end and the rear end but also the vicinity of the front end and the rear end.
As the plastic constituting the stair unit, plastics such as polycarbonate, polyethylene, ABS resin and the like can be widely used. Moreover, you may make it form the unevenness | corrugation of a non-slip | skid, and the through-hole of water draining in a tread part. Further, a rib structure for reinforcement may be formed, or meat stealing for weight reduction may be performed.

Further, the invention described in the means 2 has the gist that, in addition to the structure of the invention described in the means 1, the uneven surface is formed of a repetitive shape having a corrugated cross section.
This exemplifies a specific uneven surface shape, and is a shape in which grooves and ridges having the same shape are repeated like waves. By configuring in this way, in addition to the above-described operation, it is convenient for configuring the thickness of the kick plate portion to be constant.
Further, in the invention described in the means 3, in addition to the configuration of the invention described in the means 2, the repetitive shape of the concavo-convex surface is any one of a sine wave shape, a triangular wave shape, a square wave shape, and a trapezoidal wave shape. The gist.
This shows a specific example of the repetitive shape. Of course, it is not limited to these shapes. In particular, the sine wave shape, triangular wave shape, or trapezoidal wave shape as the uneven surface shape is an outwardly open shape, so when the uneven surface shape is formed with the same shape of the rising plate portion, the surface (front surface) of the rising plate portion and the kick plate portion It becomes easy to fit the back surface (rear surface).

Further, in the invention described in the means 4, in addition to the configuration of the invention described in any one of the means 1 to 3, a plurality of grooves and flanges extending in the vertical direction on the surface of the rising plate part are provided in the horizontal direction. The concavo-convex surfaces alternately arranged along the surface are formed, and the concavo-convex surface is alternated with the concavo-convex relationship along the left-right direction of the concavo-convex surface on the back surface of the kick plate portion.
By configuring in this way, in addition to the above-described action, the back surface of the kick plate portion of the stair unit at the upper position adjacent to the surface of the rising plate portion of the stair unit faces in an uneven relationship, and the uneven surface is just Due to the mating relationship, it becomes difficult to form a gap between the surface of the rising plate portion and the back surface of the kick plate portion. Further, the lateral displacement of the rising plate portion and the kick plate portion to be connected is prevented, and positioning is easy.
Further, in the invention described in the means 5, in addition to the configuration of the invention described in the means 4, a plurality of grooves and eaves extending in the vertical direction on the back surface of the rising plate portion are alternately arranged along the horizontal direction. The arranged uneven surface is formed, and the groove portion and the collar portion at the position where the front and back surfaces are back to back are arranged so that the uneven relationship is alternated, and the thickness of the rising plate portion is configured to be constant. This is the gist.
By constituting in this way, in addition to the above-mentioned operation, not only the kicking plate portion but also the rising plate portion formed with the uneven surface can be made constant, and the rising plate portion can be prevented from warping. .

Further, in the invention described in the means 6, a tread plate portion that is formed by integral molding of plastic and is formed in a square shape in a plan view and at least a surface thereof is horizontally disposed, and a front end side of the tread plate portion having the same width as the tread plate portion. A kick plate portion that hangs downward from the rear plate, and a rising plate portion that has the same width as the tread plate portion and rises upward from the rear end side of the tread plate portion, and at least the vertical width of the rise plate portion is the top and bottom of the kick plate portion A step unit configured not to be wider than a width, wherein a plurality of grooves and eaves extending in the vertical direction on each of the front and back surfaces of the kick plate portion are alternately arranged along the left-right direction. The gist of the invention is to form an uneven surface and to make the thicknesses of the front and back surfaces equal with respect to the center of the kick plate portion in the thickness direction.
In such a configuration, since the plurality of groove portions and the flange portions are alternately arranged along the left-right direction in the kick plate portion and have an uneven surface, the same cross-sectional area when such an uneven surface is not provided Therefore, the compressive strength in the vertical direction is improved as compared with the kick plate portion. In addition, the warp problem is eliminated because the thicknesses of the front and back surfaces are equal with respect to the center in the thickness direction of the kick plate portion despite the formation of such an uneven surface. The same applies to the paragraph 0006 described above.

The gist of the invention described in the means 7 is that the cross section is composed of a repetitive shape of a thick part and a thin part in addition to the structure of the invention described in the means 6.
This is an example of a specific uneven surface shape, and is a count where grooves and ridges of the same shape are repeated like waves. By configuring in this way, in addition to the above-described operation, it is convenient for configuring the thickness of the kick plate portion to be constant.

Further, in the invention described in the means 8, in addition to the configuration of the invention described in the means 6 or 7, a plurality of grooves and flanges extending in the vertical direction on the surface in front of the rising plate portion are provided in the horizontal direction. The concavo-convex surfaces arranged alternately are formed, and the concavo-convex relationship is opposite to the concavo-convex relationship along the left-right direction of the concavo-convex surface on the back surface of the kick plate portion.
By configuring in this way, in addition to the above-described action, the back surface of the kick plate portion of the stair unit at the upper position adjacent to the surface of the rising plate portion of the stair unit faces in an uneven relationship, and the uneven surface is just Due to the mating relationship, it becomes difficult to form a gap between the surface of the rising plate portion and the back surface of the kick plate portion. Further, the lateral displacement of the rising plate portion and the kick plate portion to be connected is prevented, and positioning is easy.
Further, in the invention described in the means 9, in addition to the configuration of the invention described in the means 8, a plurality of grooves and ridges extending in the vertical direction on the back surface of the rising plate portion are alternately arranged along the horizontal direction. The gist is that the uneven surface is formed and configured so that the thicknesses of the front and back surfaces are equal with respect to the center in the thickness direction of the kick plate portion.
By constituting in this way, in addition to the above-mentioned operation, not only the kicking plate portion but also the rising plate portion formed with the uneven surface can be made constant, and the rising plate portion can be prevented from warping. .

According to the present invention, kick strength Komiban portion is increased, it is very eliminates low possibility that warpage occurs in the riser plate.

Explanatory drawing explaining the connection state of the stair unit of Embodiment 1 of this invention. It is a staircase unit of the same Embodiment 1, (a) is a front view, (b) is a top view, (c) is sectional drawing in the AA of (a). It is a staircase unit of the same Embodiment 2, (a) is a front view, (b) is a top view, (c) is sectional drawing in the BB line of (a). It is a staircase unit of the same Embodiment 3, (a) is a front view, (b) is a top view, (c) is sectional drawing in the CC line of (a). It is a staircase unit of the same Embodiment 4, (a) is a front view, (b) is a top view, (c) is sectional drawing in the DD line of (a). It is a staircase unit of the same Embodiment 5, (a) is a front view, (b) is a top view, (c) is sectional drawing in the EE line of (a). Sectional drawing of the kick board part in other embodiment. Explanatory drawing explaining the problem of the conventional stair unit.

Hereinafter, specific embodiments of the stair unit of the present invention will be described with reference to the drawings.
(Embodiment 1)
1 and 2A to 2C show the staircase unit 1 according to the first embodiment. The staircase unit 1 is a molded product integrally formed with a plastic (for example, polycarbonate) mold. The staircase unit 1 includes a tread portion 2 having the same thickness and having a substantially rectangular upper surface 2a (back surface) formed in a plane in plan view. The rear end edge 2b of the tread plate portion 2 is formed with a plurality of isosceles triangular triangular waves having the same shape along the horizontal direction in series and at equal intervals without gaps.
On the rear end edge 2b of the tread plate portion 2, a rising plate portion 3 is formed so as to stand upward. The rising plate portion 3 is a plate-like piece having a uniform thickness orthogonal to the upper surface 2a of the tread plate portion 2, and the front and back surfaces (front and rear surfaces) 3a and 3b are formed on the rear edge 2b in the planar shape. It is an uneven surface that matches the repeated shape of the triangular wave. On both the front and back surfaces, the protruding part toward the outside can be regarded as a flange extending vertically, and the recessed part can be regarded as a groove extending vertically, and the front surface (surface) 3a The buttocks become grooves on the back surface (back surface) 3b at the same position. The position of the back surface 3 b coincides with the rear end edge 2 b of the tread plate portion 2.

  A kick plate portion 4 is formed on the front edge 2c of the tread plate portion 2 so as to hang downward. The kick plate portion 4 is a plate-like piece orthogonal to the upper surface 2a of the tread plate portion 2, and includes a front surface 4a having the same planar shape as the repeated shape of the triangular wave formed on the rear edge 2b, and a back surface 4b having an equal thickness. That is, similarly, the back surface 4b having the same planar shape as the triangular wave repetition shape formed on the rear end edge 2b is provided as an uneven surface. The frontmost position of the front surface 4 a, that is, the apex position of the triangular shape coincides with the front end edge 2 c of the tread plate portion 2. As the planar shape, the kick plate portion 4 and the rising plate portion 3 are made to coincide with each other, and the phases also coincide with each other in the left-right direction. The kick plate portion 4 is formed to have a vertical width of about 5 times that of the rising plate portion 3.

The staircase unit 1 according to the first embodiment configured as described above is installed so as to be connected in series in the vertical direction on the slope as shown in FIG. When connecting a plurality of stair units 1, the upper and lower units 1 are connected with a fastening member such as a bolt, or a support member such as a stick is provided on the back side to support the stair unit 1. May be.
In the connected state of each stair unit 1, the lower end surface 4c of the kick plate portion 4 of the stair unit 1 indicated by a solid line is installed on the upper surface 2a of the step plate portion 2 of the lower stair unit 1A indicated by a virtual line. Further, the lower end surface 4 c of the kick plate portion 4 of the stair unit 1 </ b> B indicated by an imaginary line installed on the upper side is installed on the upper surface 2 a of the step plate portion 2 of the stair unit 1. At that time, the back surface 4 b of the kick plate portion 4 is just put on the front surface 3 a of the rising plate portion 3. In this way, the kick plate portion 4 of the upper stair unit 1 contacts the step plate portion 2 of the lower stair unit 1 to form a stair.

With the configuration described above, the first embodiment has the following effects.
(1) The stair unit 1 is excellent in compressive strength as compared with the kick plate portion in which the unevenness is not formed because the kick plate portion 4 is a triangular wave plate. In addition, since the front surface 4a and the back surface 4b of the kick plate portion 4 have the same shape except that the concavo-convex relationship is reversed, the solidification time of the plastics on the front surface 4a and the back surface 4b becomes equal, and the kick plate portion 4 is warped. The possibility of doing is very small.
(2) Since the back surface 4b of the kick plate portion 4 just faces the front surface 3a of the rising plate portion 3, the kick plate portion 4 and the rising plate portion 3 can be connected with almost no gap. In addition, since the kick plate portion 4 and the rising plate portion 3 face each other due to the concavo-convex relationship, lateral displacement of the vertically adjacent stair unit 1 is prevented, and positioning becomes easy.
(3) Since both the raised plate portion 3 and the kick plate portion 4 have an uneven surface, the groove portion and the flange portion are extended in parallel in the vertical direction. It is possible to release the mold along the extending direction.

(Embodiment 2)
Next, the stair unit 11 according to the second embodiment will be described with reference to FIG. In the second embodiment, differences from the first embodiment will be mainly described, and description of contents common to the first embodiment will be omitted.
The stair unit 11 according to the second embodiment includes a tread plate portion 12, a rising plate portion 13, and a kick plate portion 14 as in the first embodiment. The second embodiment differs from the staircase unit 1 of the first embodiment in that the uneven surface shape of the rising plate portion 3 and the kick plate portion 4 of the first embodiment is a triangular wave repetition shape. The rising board part 13 and the kick board part 14 of the form 2 are that a sine wave is repeated.
By configuring in this way, the same effects as those of the first embodiment (1) and (2) can be obtained in the second embodiment.

(Embodiment 3)
Next, the stair unit 21 according to the third embodiment will be described with reference to FIG. In the third embodiment, differences from the first embodiment will be mainly described, and description of contents common to the first embodiment will be omitted.
The staircase unit 21 according to the third embodiment includes a tread plate portion 22, a rising plate portion 23, and a kick plate portion 24 as in the first embodiment. The third embodiment differs from the staircase unit 1 of the first embodiment in that the uneven surface shape of the rising plate portion 3 and the kick plate portion 4 of the first embodiment is a triangular wave repeating shape. The rising plate portion 23 and the kick plate portion 24 of the third form are a trapezoidal wave repetitive shape.
With this configuration, the same effects as those of the first embodiment (1) and (2) can be obtained in the third embodiment.

(Embodiment 4)
Next, the stair unit 31 according to the fourth embodiment will be described with reference to FIG. In the fourth embodiment, differences from the first embodiment will be mainly described, and description of contents common to the first embodiment will be omitted.
The stair unit 31 according to the fourth embodiment includes a tread plate portion 32, a rising plate portion 33, and a kick plate portion 34 as in the first embodiment. The fourth embodiment differs from the staircase unit 1 of the first embodiment in that the uneven surface shape of the rising plate portion 3 and the kick plate portion 4 of the first embodiment is a triangular wave repeating shape in a planar shape. On the other hand, the rising plate portion 33 and the kick plate portion 34 of the fourth embodiment are provided with a plurality of protrusions 35 extending in the vertical direction protruding in the front and back (front and rear) directions. The adjacent ridges 35 on the front and back surfaces are formed as concave ridges 36 separated by the width of the respective ridges 35, and an uneven surface is formed by the repeated shape of the ridges 35 and the ridges 36. In this configuration, the position of the recessed groove 36 on the back surface is disposed at the position 35 (the position of the protruding protrusion 35 on the surface is disposed at the position of the protrusion 35 on the back surface). In other words, the protrusion 35 and the protrusion 35 (the concave line 36 and the concave line 36) are arranged so as to be shifted by a half wavelength between the front and back sides.
By configuring in this way, the same effects as (1) and (2) of the first embodiment can be obtained in the fourth embodiment.

(Embodiment 5)
Next, the staircase unit 41 according to the fifth embodiment will be described with reference to FIG. In the fifth embodiment, differences from the first embodiment will be mainly described, and description of contents common to the first embodiment will be omitted.
The staircase unit 41 according to the fifth embodiment includes a tread plate portion 42, a rising plate portion 43, and a kick plate portion 44 as in the first embodiment. The fifth embodiment differs from the staircase unit 1 of the first embodiment in that the uneven surface shape of the rising plate portion 3 and the kick plate portion 4 of the first embodiment is a triangular wave repeating shape in a planar shape. In contrast, the rising plate portion 43 and the kick plate portion 44 of the fifth embodiment are provided with a plurality of protrusions 45 extending in the vertical direction protruding in the front and back (front and rear) directions. Between the adjacent ridges 45 on the front and back surfaces, concave ridges 46 separated by the width of the respective ridges 45 are formed, and an uneven surface is formed in a repetitive shape of the ridges 45 and the concave ridges 46. The fifth embodiment is different from the fourth embodiment in the fifth embodiment in which the back surface protrusion 45 is disposed at the position of the front surface protrusion 45 (the front surface groove 46 is disposed at the back surface recess 46 position). Position). That is, it is the structure by which the protrusion 35 or the concave line 36 is arrange | positioned in the same position on the front and back.
Further, in the fifth embodiment, unlike the above-described embodiments, the positions of the protrusion 45 and the recess 46 of the rising plate portion 43 and the kick plate portion 44 are arranged so as to be shifted by a half wavelength.
As described above, in the fifth embodiment, the shapes of the front and back sides coincide with each other across the center line in the thickness direction of the rising plate portion 43 and the kick plate portion 44 of p1 and p2 in FIGS. 6 (b) and 6 (c). ).

With the configuration described above, the following effects are achieved in the fifth embodiment.
(1) The stair unit 41 is superior in compressive strength compared to the kick plate portion in which the unevenness is not formed because the kick plate portion 44 is a plate-like body having a repetitive shape of the protrusion 45 and the recess 46. In addition, since the shapes of the front and back sides of the kick plate portion 44 in the thickness direction of the kick plate portion 44 coincide with each other, the solidification time of the plastics on the front and back sides becomes uniform, and the kick plate portion 44 may be warped. Is very low.
(2) Since the back surface of the kick plate portion 44 is just attached to the front surface of the rising plate portion 43 by fitting the protrusions 45 with the concave stripes 46, the kick plate portion 44 and the rising plate portion 43 have almost no gap. Can be connected. In addition, since the kick plate portion 4 and the rising plate portion 43 face each other in a concave-convex relationship as described above, lateral displacement of the vertically adjacent stair unit 1 is prevented, and positioning becomes easy.

The present invention may be embodied as follows.
-Although the said Embodiment 1-5 illustrated comparatively simply as an example in order to demonstrate this invention clearly, for example, the surface of the tread part 2, 12, 32, 42 is made into an uneven | corrugated shape, it is hard to slip, water It is free to implement by appropriately changing to other modes such as forming a hole or forming a rib structure for reinforcement.
In the first to fifth embodiments, the raised plate portions 3, 13, 23, 33, and 43 are also formed with uneven shapes. However, in the present invention, the raised plate portion does not cause a problem of warping so much. Alternatively, it may be formed in a completely flat plate shape.
-As shown in FIG. 7, you may make it comprise the kick board part 51 in a square wave shape.
In addition, the present invention may be implemented in a modified form without departing from the spirit of the present invention.

  1, 11, 21, 31, 41 ... Stair unit, 2, 12, 22, 23, 42 ... Tread plate portion, 3, 13, 23, 33, 43 ... Rising plate portion, 4, 14, 24, 34, 44 , 51 ... Kick plate part. 4a: Front surface constituting an uneven surface, 4b: Back surface constituting an uneven surface, 35, 45 ... Projections forming an uneven surface, 36, 46 ... Concavities constituting an uneven surface.

Claims (9)

A tread plate portion formed by integral molding of plastic and formed in a flat plate shape, a kick plate portion hanging down from the front end side of the tread plate portion with the same width as the tread plate portion, and the same tread plate portion with the same width as the tread plate portion A stair unit comprising a rising plate portion rising upward from the rear end side, wherein at least the vertical width of the rising plate portion is configured not to be wider than the vertical width of the kick plate portion,
A plurality of grooves and ridges extending in the vertical direction on each of the front and back surfaces of the kick plate portion are alternately arranged along the left-right direction to form a concavo-convex surface, and the position at which the front and back surfaces are back to back stairway unit, characterized in that uneven relationship between groove and ridge portions are arranged so as to alternate.   The stair unit according to claim 1, wherein the uneven surface has a repetitive shape having a corrugated cross-sectional shape. The stair unit according to claim 2, wherein the repetitive shape of the uneven surface is any one of a sine wave shape, a triangular wave shape, a square wave shape, and a trapezoidal wave shape.   A concave / convex surface in which a plurality of grooves and ridges extending in the vertical direction are alternately arranged along the left / right direction is formed on the surface of the rising plate portion, and the concave / convex surface is formed on the back surface of the kick plate portion. The staircase unit according to any one of claims 1 to 3, wherein the staircase unit alternates with a concave-convex relationship along the left-right direction of the concave-convex surface.   Forming a concavo-convex surface in which a plurality of grooves and ridges extending in the vertical direction are alternately arranged along the left-right direction on the back surface of the rising plate portion, and the groove portions at positions where the front and back surfaces are back to back The stair unit according to claim 4, wherein the ridges are arranged so that the concavo-convex relationship is alternated, and the thickness of the rising plate is configured to be constant. A step board portion that is formed by integral molding of plastic, is formed in a square shape in a plan view and has at least a surface disposed horizontally; a kick plate portion that has the same width as the tread plate portion and hangs downward from the front end side of the tread plate portion; A rising plate portion having the same width as the tread plate portion and rising upward from the rear end side of the tread plate portion is provided, and at least the vertical width of the rising plate portion is configured not to be wider than the vertical width of the kick plate portion. A stair unit,
A plurality of grooves and ridges extending in the vertical direction on the front and back surfaces of the kick plate portion are alternately arranged along the left and right direction to form an uneven surface, and the center of the kick plate portion in the thickness direction is formed. A stair unit characterized in that the thickness of the front and back is equal to the standard.   The staircase unit according to claim 6, wherein the staircase unit is formed of a repeated shape of a thick portion and a thin portion in cross-sectional shape. And a plurality of grooves and ridges which extends vertically to the surface of the rising plate part along the lateral direction to form an uneven surface placed alternately, said the uneven surface of the back side of the riser plate portion The staircase unit according to claim 6 or 7, wherein the concavo-convex relationship is opposite to the concavo-convex relationship along the left-right direction of the concavo-convex surface.   A concave and convex surface is formed by alternately arranging a plurality of groove portions and flange portions extending in the vertical direction on the back surface of the rising plate portion along the left-right direction, and based on the center in the thickness direction of the kick plate portion. The staircase unit according to claim 8, wherein the front and back are configured to have the same thickness.

Images