Ramp device

Abstract

To provide a slope device that can restrain the generation of a gap between itself and an upper stage of a step.SOLUTION: A slope device 100 comprises a lower stage side slope part 210 placed relative to a lower stage, an upper stage side slope part 270 rotatably connected with the lower stage side slope part 210 and placed relative to an upper stage, and a support part 250 that supports the lower stage side slope part 210 so as to be adjustable in a height direction.SELECTED DRAWING: Figure 8

Description

Technical Field

[0006] , , , , , , The main slope section has a top located adjacent to the upper slope section, a first inclined surface that gradually rises from the rear end toward the top, and a second inclined surface that gradually lowers from the top toward the front. ,

[0004] , It has a secondary slope section that is continuous with the lower ground surface and a main slope section that is rotatably connected to the secondary slope section. , ,

[0005] , , , , , , , ,

[0003] , , , , , , The aforementioned main slope section ,

[0001] The present invention relates to a temporary slope device.

Background Art

[0002] Conventionally, a temporary slope device has been used to easily overcome a step. Patent Document 1 discloses a slope assembly configured by connecting a plurality of slope assembly elements to be separable from each other, and the plurality of slope assembly elements can change the slope of the slope.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the slope device is not fixed to the structure, there is a problem that the slope device gradually moves due to the vibration when an operator passes through, and a gap is generated between the slope device and the upper part of the step. An object of the present invention is to provide a slope device capable of suppressing the generation of a gap between the slope device and the upper part of the step.

Means for Solving the Problems

[0005] The present invention It has a secondary slope section that is continuous with the lower ground surface and a main slope section that is rotatably connected to the secondary slope section. a lower slope part disposed on the lower stage, an upper slope part disposed on the upper stage and rotatably connected to the lower slope part, The aforementioned main slope section a support part that supports the lower slope part and the upper slope part so as to be adjustable in the height direction, The main slope section has a top located adjacent to the upper slope section, a first inclined surface that gradually rises from the rear end toward the top, and a second inclined surface that gradually lowers from the top toward the front. and is characterized by having the above.

Effects of the Invention

[0006] According to the present invention, it is possible to prevent gaps from forming between the upper and lower steps. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view of the ramp system, seen from above and the rear. [Figure 2] This is a perspective view of the ramp system, seen from below and the rear. [Figure 3] This is an exploded perspective view showing the configuration of the ramp device. [Figure 4] This is a plan view showing the configuration of the ramp device. [Figure 5] This is a bottom view showing the configuration of the ramp device. [Figure 6] This is a side view showing the configuration of the ramp device. [Figure 7A] This is an enlarged side view showing the configuration of the ramp device. [Figure 7B] This is an enlarged side view showing the configuration of the ramp device. [Figure 7C] This is a magnified view of a portion of the protrusion. [Figure 7D] This is a magnified view of a portion of the protrusion. [Figure 8] This is a side view showing the ramp device installed. [Figure 9A] This is a cross-sectional view showing a part of the configuration of the ramp device. [Figure 9B] This is a cross-sectional view showing a part of the configuration of the ramp device. [Modes for carrying out the invention]

[0008] The ramp device according to this embodiment will be described below with reference to the drawings. The ramp device of this embodiment is used at construction sites and other work sites. (First Embodiment) Figure 1 is a perspective view of the ramp device 100 from above and the rear. Figure 2 is a perspective view of the ramp device 100 from below and the rear. Figure 3 is an exploded perspective view showing the ramp device 100. Figure 4 is a plan view showing the ramp device 100. Figure 5 is a bottom view showing the ramp device 100. Figure 6 is a side view showing the ramp device 100. Figure 6 shows the view through the angle member, which will be described later. Hereafter, the lower side of the step will be referred to as the lower step, and the upper side as the upper step. Also, for convenience, in each figure, the front side from the lower step to the upper step in the horizontal direction will be denoted as Fr, the rear side as Rr, the right side as R, and the left side as L.

[0009] The ramp device 100 has the function of allowing people and objects to pass over steps with a gentle slope. In plan view, the ramp device 100 of this embodiment is, for example, roughly rectangular in shape, with the front-to-back length being longer than the left-to-right length. The ramp device 100 has a length in the front-to-back direction (La shown in Figure 6) of approximately 1250 mm (for example, in the range of 1000 mm to 1800 mm) and a length in the left-to-right direction (width direction) of approximately 600 mm (for example, in the range of 400 mm to 800 mm). The ramp device 100 of this embodiment includes a lower ramp section 210, a support section 250, and an upper ramp section 270. The lower ramp section 210 is referred to as the lower ramp section 210, and the upper ramp section 270 is referred to as the upper ramp section 270.

[0010] First, let's explain the lower slope section 210. The lower slope section 210 is positioned relative to the lower level. The lower slope section 210 is positioned at an incline relative to the lower level. In a plan view, the lower slope section 210 is, for example, roughly rectangular in shape, with its front-to-back length being longer than its left-to-right length. The front-to-back length of the lower slope section 210 is approximately 960 mm (for example, in the range of 800 mm to 1200 mm). Furthermore, the height (H shown in Figure 6) of the lower slope section 210 is adjustable between approximately 100 mm and approximately 150 mm, with an adjustment range of approximately 50 mm (for example, 40 mm to 80 mm).

[0011] When the gradient of the lower slope portion 210 of the present embodiment is represented by H / L, the gradient is set to be 1 / 6 or less and 1 / 12 or more. Here, setting the gradient to 1 / 6 or less is in consideration of the Parking Lot Act Enforcement Regulations. If the gradient is greater than 1 / 6, it is too steep, and it is preferable to set the gradient to 1 / 6 or less. Also, setting the gradient to 1 / 12 or more is in consideration of the Act on Promotion of Smooth Movement of the Elderly, Persons with Disabilities, etc. If the gradient is less than 1 / 12, the slope device 100 will become large-sized, and it is preferable to set the gradient to 1 / 12 or more.

[0012] The lower slope portion 210 has a main slope portion 211 and a sub-slope portion 220. The lower slope portion 210 is arranged in the order of the sub-slope portion 220 and the main slope portion 211 from the rear side to the front side. The surfaces (upper surfaces) of the main slope portion 211 and the sub-slope portion 220 are the same color respectively.

[0013] The main slope portion 211 is a slope portion located between the sub-slope portion 220 and the upper slope portion 270. The main slope portion 211 has a plurality (for example, six) of slope members 212 and a plurality (for example, five) of large pulling members 217. The slope member 212 is, for example, in a substantially flat plate shape where the left-right length is longer than the front-rear length. The slope member 212 is, for example, made of an aluminum alloy and is formed by extrusion molding. Also, the slope members 212 are arranged in parallel front and back without gaps. Further, the slope member 212 has ridges as anti-slip protrusions integrally provided across the left-right direction (width direction) on the upper surface. Note that the anti-slip protrusions are not limited to being ridges, and may be configured by performing blast treatment or fixing a checker plate across the entire upper surface. The configuration of the anti-slip protrusions is the same for other slope portions.

[0014] Also, the rear slope member 212a and the front slope member 212b of the main slope portion 211 are different in shape from the other central slope members 212. Figures 7A and 7B are enlarged views that enlarge a part of the side view of Figure 6. As shown in Figure 7A, the rear slope member 212a has an upper surface portion 213a, a rotating portion 214a, and a holding portion 215a. The upper surface portion 213a is the part that is exposed when viewed from above and is arranged in parallel with the central slope member 212. The upper surface portion 213a is flat except for the anti-slip protrusions. Also, the direction of the inclination of the upper surface portion 213a is the same from the rear end to the front end. Specifically, the upper surface portion 213a has an inclination such that the upper surface, excluding the anti-slip protrusions, gradually becomes higher from the rear end to the front end. The inclination angle of the upper surface portion 213a is approximately the same from the rear end to the front end.

[0015] The rotating portion 214a is approximately circular and is integrally formed with the rear end of the upper surface portion 213a. The rotating portion 214a engages with the rotated portion 233a of the sub-slope portion 220, which will be described later, and they rotate relative to each other. That is, the sub-slope portion 220 is rotatable around the axis of the rotating portion 214a in the left-right direction relative to the main slope portion 211. Note that the rotating portion 214a and the rotated portion 233a come into contact with each other and their rotation is restricted when they exceed a certain range of rotation.

[0016] The holding portion 215a is substantially plate-shaped and is integrally formed so as to extend forward from the rear end of the upper portion 213a and the front end of the rotating portion 214a. The holding portion 215a has a gap between it and the upper portion 213a, and the main beam member 217 is held in place by inserting the main beam member 217 into the gap from the front.

[0017] As shown in Figure 7B, the front slope member 212b has an upper surface portion 213b, a rotating portion 214b, and a holding portion 215b. The upper surface portion 213b is the part that is exposed when viewed from above and is arranged in parallel with the central slope member 212. The upper surface portion 213b is not flat except for the anti-slip protrusions, and the center bulges upward. The direction of the inclination of the upper surface portion 213b reverses midway from the rear end to the front end. Specifically, the upper surface portion 213b has an inclination such that the upper surface, except for the anti-slip protrusions, gradually gets higher from the rear end towards the middle (top 216), and gradually gets lower from the middle (top 216) towards the front end. The inclination angle of the upper surface portion 213b is approximately the same from the rear end to the middle (top 216), and is approximately the same from the middle (top 216) to the front end. In other words, the upper surface portion 213b is composed of two types of inclined surfaces. Here, if we denote the angle between the two types of inclined surfaces on the lower side as angle γ, then angle γ is in the range of 140° to 170° (approximately 160° in this case). Since the slope member 212b is a single rigid member, angle γ does not change.

[0018] The rotating part 214b is approximately circular and is integrally formed with the front end of the upper surface part 213b. The rotating part 214b engages with the rotated part 233b of the upper slope part 270, which will be described later, and rotates relative to it. That is, the upper slope part 270 is rotatable around the axis of the rotating part 214b in the left-right direction relative to the main slope part 211. Note that the rotating part 214b and the rotated part 233b come into contact with each other and their rotation is restricted when they exceed a certain range of rotation.

[0019] The holding portion 215b is substantially plate-shaped and is integrally formed so as to extend from the front end of the upper portion 213b and the rear end of the rotating portion 214b toward the rear. There is a gap between the holding portion 215b and the upper portion 213b (the portion from the rear end of the upper portion 213b to partway through), and the main beam member 217 is held in place by inserting the main beam member 217 into the gap from the rear.

[0020] The main beam members 217 are positioned on the underside of the slope members 212 to improve the strength of the main slope section 211. The main beam members 217 are hollow members with a roughly rectangular cross-section along the front-rear direction. The main beam members 217 are made of, for example, an aluminum alloy and are formed by extrusion molding. As shown in Figure 5, multiple main beam members 217 are arranged in parallel on the left and right sides with gaps between them. The main beam members 217 are fixed to the underside of the slope members 212 using bolts or rivets. Therefore, each slope member 212 and each main beam member 217 are configured to intersect with each other.

[0021] Furthermore, L-shaped angle members 241R and 241L are fixed to both ends of the main slope section 211 in the left-right direction. The angle members 241R and 241L function as protective members that protect the ends of the main slope section 211. The length of the angle members 241R and 241L is approximately the same as the length of the main slope section 211 in the front-rear direction. The angle members 241R and 241L are made of, for example, an aluminum alloy and are formed by extrusion molding. Angle member 241R covers the side and surface of the right end of the main slope section 211, and angle member 241L covers the side and surface of the left end of the main slope section 211. The angle members 241R and 241L are fixed to the surface of the main slope section 211 using bolts, rivets, etc.

[0022] Here, the angle members 241R and 241L have their surfaces and sides, i.e., exposed surfaces, colored a different color from the surface of the main slope section 211, for example, red. The angle members 241R and 241L function as visual indicators for recognizing the left and right ends of the main slope section 211. Coloring can be achieved through surface treatments such as anodizing, by applying paint, by attaching stickers, or by mixing coloring agents. Note that the angle members 241R and 241L are not limited to an L-shape; they may simply be plate members covering the sides of the right and left ends of the main slope section 211, or simply plate members covering the surfaces of the right and left ends of the main slope section 211.

[0023] Next, the secondary slope section 220 will be described. The secondary slope section 220 is a slope section that is continuous with the ground surface of the lower level. The secondary slope section 220 has a first slope section 221a and a second slope section 231a. The first slope portion 221a makes contact with the lower level and forms an inclined surface that is continuous with the contact surface of the lower level. The first slope portion 221a is located behind the second slope portion 231a. The first slope portion 221a is, for example, a substantially flat plate shape in which the length from left to right is longer than the length from front to back, and is composed of a single piece. The first slope portion 221a is made of, for example, an aluminum alloy and is formed by extrusion molding. The surface of the first slope portion 221a is integrally provided with protrusions that serve as anti-slip protrusions in the left-right direction.

[0024] The first slope portion 221a has a rotating portion 222a at its front end. The rotating portion 222a engages with the rotating portion 232a of the second slope portion 231a (described later), and they rotate relative to each other. That is, the first slope portion 221a is rotatable relative to the second slope portion 231a around the axis of the rotating portion 232a along the left-right direction. Note that the rotating portion 232a and the rotating portion 222a come into contact with each other and their rotation is restricted when they exceed a certain range of rotation. Furthermore, the first slope portion 221a has a seat portion 223a at its rear end that makes contact with the lower step. The seat portion 223a is formed extending across the left-right direction of the first slope portion 221a. Furthermore, a non-slip member 224a made of rubber or the like is attached to the lower surface of the first slope portion 221a. As shown in Figure 5, multiple (for example, three) non-slip members 224a are fixed to the lower surface of the first slope portion 221a at intervals in the left-right direction using screws, rivets, etc. Furthermore, the first slope portion 221a has holes 230 for fixing to the lower ground surface at positions close to the rear end and close to the left and right ends.

[0025] The second slope section 231a makes contact with the lower level and forms an inclined surface that is continuous with the first slope section 221a. The second slope section 231a is located in front of the first slope section 221a and behind the main slope section 211. The second slope section 231a is, for example, a substantially flat plate shape in which the length from left to right is longer than the length from front to back, and is composed of a single piece. The second slope section 231a is made of, for example, an aluminum alloy and is formed by extrusion molding. The surface of the second slope section 231a is integrally provided with protrusions in the left-right direction as anti-slip protrusions.

[0026] The second slope portion 231a has a rotating portion 232a at its rear end and a rotated portion 233a and a restricting portion 235a at its front end. The rotated portion 233a engages with the rotating portion 214a of the rear slope member 212a. The restricting portion 235a is roughly plate-shaped and extends diagonally downward from the front end of the rotated portion 233a. The restricting portion 235a restricts the rotation of the rotating portion 214a and the rotated portion 233a by contacting the inclined portion located between the rotating portion 214a and the holding portion 215a of the slope member 212a. Furthermore, a non-slip member 234a made of rubber or the like is attached to the lower surface of the second slope portion 231a. As shown in Figure 5, multiple (for example, three) non-slip members 234a are fixed to the lower surface of the second slope portion 231a at intervals in the left-right direction using screws, rivets, etc. Also, as shown in Figure 7A, the non-slip members 234a are in contact with the rear surface of the restricting portion 235a, and the restricting portion 235a receives force from the non-slip members 234a.

[0027] Here, the anti-slip members 224a and 234a each have a main body portion 225 and a projection portion 226. The main body portion 225 is the part that is fixed to the lower surface of the first slope portion 221a and the second slope portion 231a, respectively. The projection portion 226 is the part that protrudes from the lower surface of the main body portion 225 toward the ground surface. Multiple projection portions 226 are formed at intervals in the front-rear direction. In addition, each projection portion 226 has substantially the same shape along the left-right direction.

[0028] Figure 7C is an enlarged view of a portion of the projection 226. In Figure 7C, the anti-slip members 224a and 234a are assumed to be in contact with a horizontal contact surface (dash-dot line). The projection 226 has a front side surface 227a and a rear side surface 228a, and the center line Ce of the front side surface 227a and the rear side surface 228a is inclined so that it is towards the rear as it goes downwards. Also, the front side surface 227a and the rear side surface 228a of the projection 226 are not parallel, and are formed so that they move closer to each other as they go downwards. Here, the front angle between the front side surface 227a of the projection 226 and the contact surface is angle α1, and the rear angle between the rear side surface 228a of the projection 226 and the contact surface is angle α2. In this case, the projection 226 is formed such that angle α1 is smaller than angle α2. Due to the shape described above, the anti-slip members 224a and 234a are less likely to move backward. Therefore, the first slope section 221a and the second slope section 231a, to which the anti-slip members 224a and 234a are fixed, are less likely to move away from the upper step.

[0029] Although the rotating part 232a and the rotated part 222a, and the rotating part 214a and the rotated part 233a are fitted together and therefore do not separate in the front-to-back direction, they slide relative to each other in the left-to-right direction. Therefore, L-shaped angle members 236R and 236L are fixed to both ends of the second slope part 231a as stopper members in the left-to-right direction. The angle members 236R and 236L restrict the first slope part 221a and the main slope part 211 from sliding in the left-to-right direction. Here, the angle members 236R and 236L have their surfaces and sides, i.e., exposed surfaces, colored a different color from the surface of the second slope portion 231a, for example, red. The angle members 236R and 236L function as visual indicators for recognizing the left and right ends of the sub-slope portion 220. Coloring includes coloring by surface treatment such as anodizing, coloring by applying paint, coloring by attaching stickers, coloring by mixing coloring agents, etc. Note that the angle members 236R and 236L are not limited to an L shape, and may simply be plate members that cover the sides of the right and left ends of the second slope portion 231a, or may simply be plate members that cover the surfaces of the right and left ends of the second slope portion 231a.

[0030] Next, we will explain the upper slope section 270. The upper slope section 270 is positioned relative to the upper level. The upper slope section 270 is positioned at an inclination relative to the upper level. In a plan view, the upper slope section 270 is approximately rectangular in shape, for example, with its left-right length being longer than its front-to-back length. The front-to-back length of the upper slope section 270 is approximately 260 mm (for example, in the range of 150 mm to 300 mm). When the gradient of the upper slope section 270 in this embodiment is expressed as H / L, the gradient is set to be 1 / 6 or less and 1 / 12 or more.

[0031] In this embodiment, the upper slope section 270 is configured to be interchangeable with the sub-slope section 220. Specifically, the slope device 100 can function even if the sub-slope section 220 is removed from the slope device 100 and the upper slope section 270 is installed in the position of the sub-slope section 220. Similarly, the slope device 100 can function even if the upper slope section 270 is removed from the slope device 100 and the sub-slope section 220 is installed in the position of the upper slope section 270. In this embodiment, the upper slope section 270 and the sub-slope section 220 are interchangeable. The upper slope section 270 can be made interchangeable with the sub-slope section 220 by having the same configuration. The upper slope section 270 has the same configuration as the sub-slope section 220, and therefore the gradient H / L of the upper slope section 270 and the sub-slope section 220 are approximately the same. However, the upper slope section 270 does not have to have the same configuration as the sub-slope section 220, and it does not have to be interchangeable.

[0032] In this embodiment, the upper slope section 270 is configured by rotating the sub-slope section 220 180 degrees around the vertical axis O (see Figures 1 and 2). Therefore, explanations that overlap with those of the sub-slope section 220 will be omitted as appropriate.

[0033] The upper slope section 270 is a slope section that is continuous with the ground surface of the upper section. The upper slope section 270 has a first slope section 221b and a second slope section 231b. The first slope section 221b makes contact with the upper level and forms a continuous inclined surface from the contact surface of the upper level. The first slope section 221b is located in front of the second slope section 231b.

[0034] The first slope portion 221b has a rotating portion 222b at its rear end. The rotating portion 222b engages with the rotating portion 232b of the second slope portion 231b (described later), and they rotate relative to each other. That is, the first slope portion 221b is rotatable relative to the second slope portion 231b around the axis of the rotating portion 232b along the left-right direction. Note that the rotating portion 232b and the rotating portion 222b come into contact with each other and rotation is restricted when they exceed a certain range of rotation. Furthermore, the first slope portion 221b has a seat portion 223b at its front end that makes contact with the upper level. The seat portion 223b is formed extending across the left-right direction of the first slope portion 221b. Furthermore, a non-slip member 224b made of rubber or the like is attached to the lower surface of the first slope portion 221b. As shown in Figure 5, multiple (for example, three) non-slip members 224b are fixed to the lower surface of the first slope portion 221b at intervals in the left-right direction using screws, rivets, etc. Furthermore, the first slope portion 221b has holes 230 for fixing to the ground surface of the upper section at positions close to the front end and close to the left and right ends.

[0035] The second slope section 231b is in contact with the upper level and forms a continuous inclined surface from the first slope section 221b. The second slope section 231b is located behind the first slope section 221b and in front of the main slope section 211.

[0036] The second slope portion 231b has a rotating portion 232b at its front end and a rotated portion 233b and a restricting portion 235b at its rear end. The rotated portion 233b engages with the rotating portion 214b of the front slope member 212b. The restricting portion 235b is roughly plate-shaped and extends diagonally downward and rearward from the rear end of the rotated portion 233b. The restricting portion 235b restricts the rotation of the rotating portion 214b and the rotated portion 233b by contacting the inclined portion located between the rotating portion 214b and the holding portion 215b of the slope member 212b. Furthermore, a non-slip member 234b made of rubber or the like is attached to the lower surface of the second slope portion 231b. As shown in Figure 5, multiple (for example, three) non-slip members 234b are fixed to the lower surface of the second slope portion 231b at intervals in the left-right direction using screws, rivets, etc. Also, as shown in Figure 7B, the non-slip members 234b are in contact with the front surface of the restricting portion 235b, and the restricting portion 235b receives force from the non-slip members 234b.

[0037] Here, the anti-slip members 224b and 234b each have a main body portion 225 and a projection portion 226. The main body portion 225 is the part that is fixed to the lower surface of the first slope portion 221b and the second slope portion 231b, respectively. The projection portion 226 is the part that protrudes from the lower surface of the main body portion 225 toward the ground surface. Multiple projection portions 226 are formed at intervals in the front-rear direction. In addition, each projection portion 226 has substantially the same shape along the left-right direction.

[0038] Figure 7D is an enlarged view of a portion of the projection 226. In Figure 7D, the anti-slip members 224b and 234b are assumed to be in contact with a horizontal contact surface (dotted line). The projection 226 has a rear side surface 227b and a front side surface 228b, and the center line Ce of the rear side surface 227b and the front side surface 228b is inclined so that it is on the front side as it goes downwards. Also, the rear side surface 227b and the front side surface 228b of the projection 226 are not parallel, and are formed so that they come closer to each other as they go downwards. Here, the rear angle between the rear side surface 227b of the projection 226 and the contact surface is angle β1, and the front angle between the front side surface 228b of the projection 226 and the contact surface is angle β2. In this case, the projection 226 is formed such that angle β1 is smaller than angle β2. Due to the shape described above, the anti-slip members 224b and 234b are less likely to move forward. Therefore, the first slope section 221b and the second slope section 231b, to which the anti-slip members 224b and 234b are fixed, are less likely to move away from the lower step.

[0039] Although the rotating part 232b and the rotated part 222b, and the rotating part 214b and the rotated part 233b are fitted together and therefore do not separate in the front-to-back direction, they slide relative to each other in the left-to-right direction. Therefore, L-shaped angle members 236R and 236L are fixed to both ends of the second slope part 231b as stopper members in the left-to-right direction. The angle members 236R and 236L restrict the first slope part 221b and the main slope part 211 from sliding in the left-to-right direction.

[0040] Next, we will explain the support section 250. The support portion 250 is located below the lower slope portion 210 and at the front end of the lower slope portion 210 in the front-rear direction. The support portion 250 supports the lower slope portion 210 so that it can be adjusted in the height direction. The support section 250 of this embodiment has a first support unit 251a and a second support unit 251b. The first support unit 251a and the second support unit 251b are located below the slope member 212b, which is located at the front of the main slope section 211, and are positioned on both the left and right sides of the slope member 212b. The first support unit 251a and the second support unit 251b have the same basic configuration. Therefore, the basic configuration of both will be explained here using the first support unit 251a as an example, and the different configurations will be described later.

[0041] As shown in Figure 3, the first support unit 251a includes a mounting member 252 and an adjustment member 261. The mounting member 252 is fixedly attached to the lower slope portion 210 and screwed into the adjustment member 261. Specifically, the mounting member 252 has a main body portion 253, a mounting portion 255, and a nut 257 as a female thread portion. Here, the main body portion 253 and the mounting portion 255 are integral members formed by bending through press molding, and are made of, for example, iron.

[0042] The main body 253 is roughly U-shaped when viewed from the front or back, and has a hole 254 through which the adjustment member 261 is inserted approximately in the center (see Figures 9A and 9B described later). The mounting portion 255 is continuous with both the left and right ends of the main body portion 253 and, when viewed from the front or back, is a roughly hat-shaped brim. The mounting portion 255 is in contact with the lower surface of the slope member 212b and is fixed to the slope member 212b using screws, rivets, etc., through multiple mounting holes.

[0043] The nut 257 is fixed to the lower surface of the main body 253, for example by welding, in communication with a hole 254 located approximately in the center of the main body 253. Here, when the first support unit 251a and the second support unit 251b are attached to the lower slope section 210, the axis of the nut 257 is not aligned with the vertical direction when viewed from the front or rear direction, but is intentionally tilted at a predetermined angle. In other words, the extension direction of the mounting portion 255 of the main body 253 to which the nut 257 is fixed is designed so that it is not intentionally parallel to the horizontal plane when viewed from the front or rear direction.

[0044] The adjustment member 261 is screwed into the mounting member 252 and also makes contact with the lower contact surface. The adjustment member 261 has a male threaded portion 262 and a receiving seat 265. The axis of the male threaded portion 262 protrudes upward from the receiving seat 265. The receiving seat 265 is made of, for example, resin or rubber and is roughly disc-shaped. The receiving seat 265 has multiple recesses formed around its entire outer circumference, directed toward the center, to allow the operator to rotate the adjustment member 261 around its axis. In addition, the bottom surface of the receiving seat 265 is not flat, but a curved surface that is convex downwards. The center of the bottom surface of the receiving seat 265 is located at the lowest point. Furthermore, the bottom surface of the receiving seat 265 has irregularities formed on it.

[0045] To assemble the first support unit 251a, the male threaded portion 262 of the adjustment member 261 is screwed onto the nut 257 of the mounting member 252 from below and inserted through the hole 254 of the main body 253. Next, a washer 272, which serves as a retaining part, is attached to the tip of the adjustment member 261 using a screw 273 (see Figure 3), thereby assembling the first support unit 251a. The second support unit 251b has the same configuration as the first support unit 251a, but the direction in which the axis of the nut 257 is inclined when viewed from the front-rear direction is symmetrical with respect to the center line C in the left-right direction of the lower slope section 210. The ramp device 100 can be assembled by attaching the assembled first support unit 251a and second support unit 251b to the main ramp section 211, respectively.

[0046] Next, a method for installing the ramp device 100, configured as described above, at a work site with steps will be explained. The worker brings the ramp device 100 to the work site. Next, the worker rotates the adjustment member 261 according to the height between the lower and upper steps that are in contact with the ground, shortening or lengthening the length from the mounting member 252 to the receiving seat 265 (the amount of protrusion of the adjustment member 261). Specifically, if the height between the lower and upper steps is high, the adjustment member 261 is rotated so that the amount of protrusion of the adjustment member 261 increases. On the other hand, if the height between the lower and upper steps is low, the adjustment member 261 is rotated so that the amount of protrusion of the adjustment member 261 decreases.

[0047] Next, the worker installs the ramp device 100, with the protrusion amount of the adjustment member 261 adjusted, onto the step. Specifically, the lower ramp section 210 of the ramp device 100 is placed on the ground surface of the lower step, and the upper ramp section 270 is placed on the ground surface of the upper step. At this time, the receiving seat 265 of the adjustment member 261 of the support section 250 is placed on the ground surface of the lower step that is close to the upper step. Furthermore, if the upper slope section 270 is only partially in contact with the upper ground surface and is partially floating, the worker will extend the adjustment members 261 of the first support unit 251a and the second support unit 251b downwards or upwards, respectively. For example, the worker will rotate the adjustment members 261 of the first support unit 251a and the second support unit 251b while the slope device 100 is lifted.

[0048] Finally, the worker can install the ramp device 100 by fixing the secondary ramp section 220 and the upper ramp section 270 to the lower and upper ground surfaces using bolts or the like through the holes 230 in the secondary ramp section 220 and the upper ramp section 270, respectively, as needed. Furthermore, the installation method of the ramp device 100 is not limited to the method described above and can be changed as appropriate.

[0049] Next, with reference to Figure 8, the state in which the ramp device 100 is installed will be described. Figure 8(a) is a side view showing the ramp device 100 in its installed state. As shown in Figure 8(a), the ramp device 100 has a lower ramp section 210 that is in contact with the lower ground surface, and an upper ramp section 270 that is in contact with the upper ground surface. By installing the ramp device 100 in this way, workers can overcome steps with a gentle slope. In particular, the upper surface 213b of the slope member 212b of the main slope section 211 is composed of two types of inclined surfaces that reverse direction midway from the rear end to the front end, and the lower angle γ formed by the two types of inclined surfaces does not change. Therefore, even if the worker adjusts the amount of protrusion of the adjustment member 261 according to the height between the lower and upper steps, they can easily climb over the highest point (top 216) of the slope device 100. Furthermore, when the worker adjusts the protrusion amount of the adjustment member 261 according to the height between the lower and upper levels, the gradient of the main slope section 211 changes. On the other hand, the sub-slope section 220 is rotatably connected to the main slope section 211, and the upper slope section 270 is rotatably connected to the main slope section 211. Therefore, the gradient of the sub-slope section 220 does not change as it rotates relative to the main slope section 211. Similarly, the gradient of the upper slope section 270 does not change as it rotates relative to the main slope section 211. Therefore, the gradient at which a worker begins to pass over the slope device 100 can always be kept constant.

[0050] On the other hand, with the ramp device 100, vibrations caused by workers passing over the ramp device 100 can cause the ramp device 100 to gradually move. In this case, it is assumed that the sub-ramp section 220 and the upper ramp section 270 are not fixed to the lower and upper ground surfaces.

[0051] Figure 8(b) is a side view showing the state in which the ramp device 100 has gradually moved due to vibration from its installed state. As shown in Figure 8(b), the ramp device 100 may move in a direction away from the upper step, with the support portion 250 moving away from the upper step. The ramp device 100 of this embodiment has an upper ramp portion 270 that is rotatably connected to the lower ramp portion 210 and positioned relative to the upper step. Therefore, even if a gap is created between the lower ramp portion 210 and the upper step, the upper ramp portion 270 also moves together with the lower ramp portion 210, and the upper ramp portion 270 is positioned to span across the lower ramp portion 210 and the upper step. In this way, by positioning the upper ramp portion 270 to span across the lower ramp portion 210 and the upper step, the upper ramp portion 270 can close the gap created between the lower ramp portion 210 and the upper step from above, thereby suppressing the creation of a gap between the ramp device 100 and the upper end of the step.

[0052] Next, with reference to Figures 9A and 9B, a configuration that suppresses the rearward movement of the ramp device 100 due to vibration will be described. Figures 9A and 9B are cross-sectional views showing a part of the ramp device 100. Here, we will describe the first support unit 251a, but the second support unit 251b is similar. Figure 9A shows the state in which the protrusion amount of the adjustment member 261 is shortest, that is, the state in which the main slope portion 211 is at its lowest (lower limit of the adjustment range). Here, the lower end of the nut 257 and the receiving seat 265 are in contact, so the protrusion amount of the adjustment member 261 cannot be made any shorter than this state. Figure 9B shows the state in which the adjustment member 261 protrudes the longest, i.e., the state in which the main slope portion 211 is at its highest point (upper limit of the adjustment range). In the state shown in Figure 9B, the upper end of the adjustment member 261 is located in the hole 254 of the main body portion 253 of the mounting member 252. Also, since the upper end of the hole 254 and the washer 272 at the upper end of the adjustment member 261 are in contact, the protrusion amount of the adjustment member 261 cannot be increased beyond this state.

[0053] Here, as shown in Figure 9A, the adjustment member 261 is in contact with the floor surface at an inclination. That is, the axis S of the male threaded portion 262 of the adjustment member 261 is inclined with respect to the floor surface. Specifically, in a side view, the male threaded portion 262 of the adjustment member 261 is inclined such that the upper side is closer to the upper step and the lower side is further away from the upper step; in other words, the upper side is towards the front and the lower side is towards the rear. From this state, by adjusting the amount of protrusion of the adjustment member 261 in the direction of advancement, the gradient of the lower slope section 210 changes, and consequently, the angle at which the axis S of the male screw section 262 of the adjustment member 261 is inclined also changes. Specifically, the angle at which the axis S of the male screw section 262 is inclined changes so that it becomes closer to the vertical direction with respect to the floor surface.

[0054] In this embodiment, even in the state shown in Figure 9B, the adjustment member 261 is not vertical, but rather slightly inclined with respect to the floor surface. That is, the axis S of the male threaded portion 262 of the adjustment member 261 is inclined with respect to the floor surface. Specifically, in a side view, the male threaded portion 262 of the adjustment member 261 is inclined such that the upper side is close to the step and the lower side is away from the step; in other words, the upper side is towards the front and the lower side is towards the rear. In other words, within the adjustment range of the adjustment member 261, from the lower limit to the upper limit, the axis S of the male screw portion 262 is inclined such that the upper side is close to the step and the lower side is away from the step.

[0055] Here, because the base of the adjustment member 261's receiving seat 265 is a curved surface, the part that is offset from the axis S towards the step, that is, the part that is offset towards the front, makes contact with the contact surface. When vibrations are applied to the adjustment member 261 as people or objects pass over the ramp device 100, the direction of the reaction force that the adjustment member 261 receives from the floor surface becomes approximately parallel to the axis S. Therefore, if vibrations or other forces are applied to the adjustment member 261 due to people or objects passing over it, the adjustment member 261 will attempt to move forward in the front-to-back direction, i.e., towards the upper level. Consequently, it is possible to suppress the movement of the ramp device 100 toward the rear.

[0056] In this embodiment, we have described a case in which, in a side view, the axis S of the male screw portion 262 is inclined such that the upper side is closer to the upper step and the lower side is further away from the upper step, from the lower limit to the upper limit of the adjustment range of the adjustment member 261. However, the embodiment is not limited to this case. For example, in the range from the lower limit to the middle of the adjustment range of the adjustment member 261, the axis S of the male screw portion 262 may be inclined such that the upper side is closer to the upper step and the lower side is further away from the upper step. Also, if the adjustment range is R, in the range from the lower limit to R × 3 / 4 (more than half of the adjustment range but not the entire adjustment range), the axis S of the male screw portion 262 may be inclined such that the upper side is closer to the upper step and the lower side is further away from the upper step. In other words, in the upper limit of the adjustment range, the axis S of the male screw portion 262 may be perpendicular to the floor surface, or it may be inclined such that the upper side is further away from the upper step and the lower side is closer to the upper step. In this case, for example, this can be addressed by informing the worker that the range in which the upper side of the axis S of the male screw portion 262 is inclined such that the upper side is closer to the upper step and the lower side is further away from the upper step is the adjustment range of the adjustment member 261.

[0057] Although the present invention has been described above in conjunction with the embodiments described above, the present invention is not limited to the embodiments described above, and modifications can be made within the scope of the present invention. In this embodiment, the case in which the support portion 250 has two support units 251a and 251b has been described, but it is not limited to this case, and it may have three or more support units. For example, if the support portion 250 has three support units, and the third support unit is designated as the third support unit 251c, then the third support unit 251c can be positioned between the first support unit 251a and the second support unit 251b.

[0058] In this embodiment, the case in which the upper slope section 270 and the sub-slope section 220 have the same configuration has been described, but they may have some identical configurations and other configurations that differ. For example, the anti-slip members 224b and 234b of the upper slope section 270 do not have to have the same configuration as the anti-slip members 224a and 234a of the sub-slope section 220. Specifically, the case in which the anti-slip members 224b and 234b of the upper slope section 270 are inclined so that the center line Ce between the rear side surface 227b and the front side surface 228b is towards the front as it goes downward has been described, but the case is not limited to this, and they may also have a configuration like the one shown in Figure 7C, where the center line Ce between the rear side surface 227b and the front side surface 228b is inclined so that it is towards the rear as it goes downward. [Explanation of Symbols]

[0059] 100: Slope device 210: Lower slope section (lower slope section) 211: Main slope section 220: Sub-slope section 221a: First slope section 231a: Second slope section 270: Upper slope section (upper slope section) 221b: First slope section 231b: Second slope section 250: Support section 252: Mounting member 261: Adjustment member

Claims

1. A lower slope portion having a sub-slope portion that is continuous with the ground surface of the lower step and a main slope portion that is rotatably connected to the sub-slope portion, and a lower slope portion that is positioned relative to the lower step, The upper slope section is rotatably connected to the lower slope section and is positioned relative to the upper section, It has a support portion that supports the main slope portion so as to be adjustable in the height direction, The aforementioned main slope section is, The top portion located adjacent to the aforementioned upper slope portion, A first inclined surface that gradually rises from the rear end towards the top, A ramp device characterized by having a second inclined surface that gradually decreases in height from the top towards the front end.

2. The slope device according to Claim 1, characterized in that the lower angle formed by the first inclined surface and the second inclined surface remains constant even when the main slope portion is adjusted in the height direction.

3. The ramp device according to claim 1 or 2, characterized in that the lower angle formed by the first inclined surface and the second inclined surface is an obtuse angle.

4. The ramp device according to claim 1 or 2, characterized in that the lower angle formed by the first inclined surface and the second inclined surface is in the range of 140° to 170°.

5. The ramp device according to any one of claims 1 to 4, characterized in that the sub-ramp section and the upper ramp section are interchangeable.

6. The ramp device according to any one of claims 1 to 5, characterized in that the gradient between the sub-ramp section and the upper ramp section remains constant even when the main ramp section is adjusted in the height direction.

7. The aforementioned sub-slope section is, A first slope section that is continuous from the lower ground surface, A ramp device according to any one of claims 1 to 6, characterized in that it comprises a second ramp portion that is rotatably connected to the first ramp portion and positioned on the lower ground surface.

8. The aforementioned upper slope section is, A first slope section that is continuous from the ground surface of the upper level, A ramp device according to any one of claims 1 to 6, characterized in that it comprises a second ramp portion that is rotatably connected to the first ramp portion and positioned on the upper ground surface.

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