Crawler belt wheel structure for material conveyance vehicle

Abstract

To provide a crawler belt wheel structure for a material conveyance vehicle that is able to convey young plants, etc, while horizontally keeping a loading platform with the young plants, etc. thereon even when running on a flat land or when going up the inclined uneven ground.SOLUTION: In a material conveyance vehicle capable of placing a material on a load-carrying platform, a crawler belt wheel structure has a crawler annularly surrounding, by means of a shoe, a sprocket disposed on a rear-end side on a lower side of a load-carrying platform and rotated by power, an idler disposed on a front-end side on the lower side of the load-carrying platform, and a plurality of rollers arranged in parallel on a straight line between and below the sprocket and the idler; wherein, in the rollers, a rotation shaft of a front roller at a leading end and a rotation shaft of a second middle roller are connected by a connecting member; and wherein a support shaft is passed through the connecting member, and the connecting member is turned vertically so that the idler, the front roller, and the middle roller are arranged on a straight line when ascending a slope.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a track wheel structure for traveling on slopes on a material transport vehicle that transports seedlings and the like to mountain forests. [Background technology]

[0002] After trees are cut down from forests, reforestation (afforestation) is carried out for the purpose of the next timber production and forest conservation. The reforestation rate after cutting and harvesting is low at 30-40%. Carrying seedlings and other materials on one's back while climbing up the uneven slopes of forests is hard work, and there is a strong demand for mechanization to replace manual labor.

[0003] Patent Document 1 discloses an invention for a self-propelled work transport vehicle with a platform frame that can be raised and lowered. It is powered by an engine and can travel on sloped and uneven ground using crawlers, but since the platform also tilts, there are cases where the load falls off or the vehicle becomes unstable, especially when climbing over obstacles.

[0004] Patent Document 2 also discloses an invention for an evacuation vehicle that runs on a crawler mechanism on stairs and on flat ground with wheels that touch the ground, making it easy to push it by hand. The running wheels make a seesaw motion, but the crawler mechanism avoids the running wheels when running.

[0005] Patent Document 3 discloses an invention for a device for preventing forward tipping of a transport vehicle, which prevents the vehicle body from tipping forward by supporting the support legs against the ground when the vehicle is tilted downward at the front. Although this prevents the vehicle from tipping forward when going down a slope, it does not stabilize the vehicle's posture when going up a slope.

[0006] Patent Document 4 also discloses an auxiliary leg extension and retraction device for a transport vehicle that can reliably contact the ground regardless of the unevenness or shape of the ground. If the ground is inclined, the auxiliary legs extend and retract perpendicular to the slope, making it difficult to provide stable support. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 3311981 [Patent Document 2] Special Publication No. 01-034188 [Patent Document 3] JP 2018-043697 A [Patent Document 4] Japanese Utility Model Application Publication No. 58-048539 Summary of the Invention [Problem to be solved by the invention]

[0008] However, in the inventions described in Patent Documents 1 to 4, when climbing up an uneven slope for reforestation, if the crawler of the transport vehicle is on the ground along the slope, it may be difficult to overcome obstacles. Even if the vehicle is driven by power, the worker holds the handle to operate it, so the weight of the transport vehicle is placed on the worker. It would be ideal if the platform loaded with seedlings and the like could be transported while being kept vertical to the direction of gravity rather than the slope so that it is horizontal, but this is also difficult. Depending on the slope, especially when the vehicle stops temporarily, if the platform is not kept horizontal to the vertical direction, the transport vehicle may fall over or the seedlings and the like may fall off the platform.

[0009] Therefore, an object of the present invention is to provide a track wheel structure for a material transport vehicle that can easily overcome obstacles whether traveling on flat ground or climbing uneven sloping terrain, and can also keep the loading platform loaded with seedlings, etc., level. [Means for solving the problem]

[0010] In order to solve the above problems, the track wheel structure of the present invention is characterized in that, in a material transport vehicle capable of loading materials onto a loading platform, the track wheel structure has a sprocket that is arranged at the rear end of the underside of the loading platform and rotates by power, an idler that is arranged at the front end of the underside of the loading platform, and rollers that are arranged side by side in a straight line between and below the sprocket and the idler, and a crawler surrounded by a ring of shoes, the rollers have a front roller at the tip and a second middle roller connected by a connecting member, a support shaft is passed through the connecting member so that the connecting member can rotate up and down, and the connecting member rotates so that the idler, front roller, and middle roller are aligned in a straight line when going up a slope.

[0011] In the above-mentioned track roller structure, the connecting material has a support shaft passing through it forward from the center, which is characterized by preventing the front roller from lifting up due to tension in the shoe when traveling on flat ground.

[0012] In the above-mentioned track wheel structure, the crawler is characterized in that the shoe is a single wheelbarrow.

[0013] The material transport vehicle of the present invention is further characterized in that it is provided with the track wheel structure and outriggers extending downward from the loading platform to support the loading platform in a horizontal position when traveling up a slope.

[0014] The material transport vehicle of the present invention is further characterized in that it is equipped with the track wheel structure and outriggers which protrude vertically from the loading platform toward the lower side of the slope by a link mechanism in order to support the loading platform in a horizontal position in the direction of moving laterally up the slope. Effect of the Invention

[0015] According to the present invention, the platform loaded with seedlings and the like can be maintained horizontally when traveling on flat ground or when climbing up a sloping, uneven terrain. When traveling on flat ground, the lower rollers of the crawler are in contact with the ground, but when traveling on a sloping, uneven terrain, the rollers rotate so that the crawler follows the slope. It is also possible to prevent the front of the crawler from lifting off the ground when traveling on flat ground. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a diagram showing a material handling vehicle according to the present invention. [Diagram 2] 1 is a diagram illustrating the operation of the track wheel structure of the material transport vehicle of the present invention. [Diagram 3] 1 is a diagram illustrating a situation in which an obstacle is overcome by the track wheel structure of a material transport vehicle according to the present invention. [Figure 4] 1 is a diagram illustrating a situation in which a step is overcome by the track wheel structure of a material transport vehicle according to the present invention. FIG. [Diagram 5] FIG. 2 is a side view showing a first outrigger of the material handling vehicle of the present invention. [Figure 6] FIG. 2 is a diagram showing a state in which a first outrigger of the material transport vehicle according to the present invention has touched down on a slope in an ascending direction. [Figure 7] FIG. 2 is a diagram showing a state in which a first outrigger of the material transport vehicle according to the present invention has been grounded in a direction crossing a slope. [Figure 8] FIG. 2 is a perspective view showing a second outrigger of the material handling vehicle of the present invention. [Figure 9] FIG. 2 is a diagram showing the stored state of the second outrigger of the material transport vehicle of the present invention. [Figure 10] FIG. 2 is a diagram showing a state in which the second outrigger of the material handling vehicle of the present invention is partially extended. [Figure 11] FIG. 2 is a view showing the second outrigger of the material handling vehicle of the present invention in an extended state. [Figure 12] FIG. 2 is a diagram showing a state in which the second outrigger of the material transport vehicle of the present invention has been grounded on a slope. [Figure 13] FIG. 4 is a diagram illustrating the movement locus of the second outrigger of the material handling vehicle of the present invention. [Figure 14] FIG. 13 is a diagram showing the work load when working with the material transport vehicle of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Note that components having the same functions are designated by the same reference numerals, and repeated description thereof may be omitted. EXAMPLES

[0018] First, the track wheel structure of a material transport vehicle will be described. Figure 1 shows (a) the track wheel structure and (b) the outriggers of a material transport vehicle. Figure 2 is a diagram explaining (a) the track wheel structure traveling on flat ground and (b) traveling on sloped and uneven ground with the track wheel structure. Figure 3 is a diagram explaining (a) the state before and (b) the state after climbing over an obstacle with the track wheel structure. Figure 4 is a diagram explaining (a) the state before and (b) the state after climbing over a step with the track wheel structure. Note that the traveling direction of the vehicle is defined as front and rear, and the lateral direction as viewed from the operator is defined as left and right. Vertical is defined as a right angle to the ground (slope), perpendicular is defined as the direction of gravity, and horizontal is defined as a right angle to the direction of gravity.

[0019] As shown in FIG. 1(a), the material transport vehicle 100 is a handcart that can run on tracks (crawlers 200) using power such as electricity, and materials such as seedling boxes 150 containing seedlings or the like can be loaded onto a loading platform 120.

[0020] The crawler 200 has a track wheel structure in which a drive wheel (sprocket 220) that is arranged at the rear end of the underside of the loading platform 120 and rotates by power, an idler wheel (idler 230) that is arranged at the front end of the underside of the loading platform 120, and rollers (front roller 260, middle roller 270, rear roller 280) that are arranged in a straight line between and below the sprocket 220 and the idler 230 are surrounded in a ring shape by a track shoe (290).

[0021] The crawler 200 uses a support frame 210 to support the sprocket 220, the idler 230, and the rollers 260, 270, and 280, and the shoe 290 is hung on them in a taut state.

[0022] The sprocket 220 is a gear-shaped drive wheel for transmitting the shaft of the wheels of the crawler 200, which rotates by power such as electricity, to the shoe 290. The shaft passes through the center of the wheel, and the position is fixed to the rear end side of the support frame 210.

[0023] The idler 230 is an idler wheel (guiding wheel) of the crawler 200 that is attached to the front end side of the support frame 210, which is opposite the sprocket 220. Wheels may be provided on both the left and right sides of the support frame 210 and supported rotatably with an axis passing through the center. The position may be moved forward or backward to make it possible to adjust the tension of the shoe 290.

[0024] The rollers 260, 270, and 280 are wheels of the crawler 200 that are disposed on the ground 160 side. The front roller 260, which is disposed first from the front, and the middle roller 270, which is disposed second from the front, are connected by a connecting member 250.

[0025] The rotation shaft of the front roller 260 may be passed through the front end of the connecting member 250, and the rotation shaft of the middle roller 270 may be passed through the rear end. The connecting member 250 may be attached to the support frame 210 through the support shaft 240 in the middle so as to be rotatable up and down. Note that the middle may be between the front roller 260 and the middle roller 270, and does not have to be the center.

[0026] The rear roller 280 is attached to the rear side of the middle roller 270. There may be one or more wheels for the rear roller 280. Wheels may be provided on both the left and right sides of the support frame 210, and the support may be rotatably supported by passing an axis through the center.

[0027] The shoe 290 is a circular rubber belt. As the sprocket 220 rotates, the gears of the sprocket 220 mesh with the holes in the rubber belt one after another, sending out the shoe 290. The shoe 290 also has multiple intermittent protrusions on its inner circumference to prevent it from coming off the wheel. The idler 230 and the rollers 260, 270, and 280 can ensure that the protrusions of the shoe 290 can pass by leaving a space between the two wheels.

[0028] As shown in Fig. 1(b), the material transport vehicle 100 has a frame 130 on a loading platform 120 to hold the seedling boxes 150 placed on it so that they do not fall to the left or right, and an operator can steer the vehicle in the direction of travel by holding a handlebar 140. In addition, the vehicle is provided with electric outriggers 110 on both the left and right sides that protrude downward from the loading platform 120 in order to support the loading platform 120 in a horizontal state in the direction going up the slope 160a.

[0029] In the material transport vehicle 100, the shoe 290 of the crawler 200 is a single wheelbarrow, and is supported by extendable outriggers 110 to prevent it from tipping over to the left or right. When traveling, the outriggers 110 are stored under the bed 120, and when stopped, the outriggers 110 are simply extended to the ground 160.

[0030] The outriggers 110 have thighs, knees, and feet, and when extended, they extend rearward by a link mechanism to be longer than the distance from the loading platform 120 to the ground 160, and can adequately support even a slope 160a. The feet extend diagonally downward (vertically) rearward from the vehicle body, and the vehicle body has strong strength in the fore-aft direction, so the vehicle can be parked facing the incline when climbing an incline. When retracted, they are stored compactly in the space below the loading platform 120 and do not interfere with driving. When retracted in the fore-aft direction, they are unlikely to protrude to the left or right and get caught on something.

[0031] As shown in FIG. 2(a), when the crawler 200 runs on flat ground 160, the sprocket 220 and the idler 230 are positioned on the upper side, and the front roller 260, the middle roller 270, and the rear roller 280 are aligned in a straight line on the lower side, so that the shoe 290 has an inverted trapezoidal shape.

[0032] At this time, if the support shaft 240 is passed through the center of the connecting material 250, the front roller 260 will protrude forward, and when the shoe 290 is tensioned, the connecting material 250 will rotate in an attempt to hold down the protrusion of the front roller 260, causing the front roller 260 to float, and it is likely that only the middle roller 270 and the rear roller 280 will be in contact with the ground.

[0033] Therefore, by passing the support shaft 240 forward from the center of the connecting material 250 and suppressing the protrusion of the front roller 260, the front roller 260 is prevented from floating even if the shoe 290 is taut when traveling on a flat ground surface 160.

[0034] As shown in Fig. 2(b), when the crawler 200 climbs the slope 160a or overcomes an obstacle or step, the connecting member 250 rotates so that the idler 230, the front roller 260, and the middle roller 270 are aligned in a straight line. The loading platform 120 does not tilt in response to the slope 160a, but can be maintained horizontally.

[0035] The position at which the connecting member 250 is fastened to the support frame 210 may be adjustable so that the idler 230, the front roller 260, and the middle roller 270 are aligned in a straight line even if the angle of the inclined surface 160a varies.

[0036] To achieve a position where the idler 230, the front roller 260, and the middle roller 270 are aligned in a straight line on the inclined surface 160a, the handle 140 must be lifted, and constantly maintaining this position can be a burden for the operator.

[0037] As shown in FIG. 3(a), when the crawler 200 is traveling along the slope 160a (with the loading platform 120 parallel to the slope 160a) and an obstacle 160b or unevenness is encountered along the way, the loading platform 120 can be lifted so that it is nearly horizontal, as shown in FIG. 3(b), allowing the crawler 200 to easily get over the obstacle 160a.

[0038] Furthermore, even if there is a step on the ground 160 as shown in FIG. 4(a), the connecting member 250 can rotate so that the front roller 260 and the middle roller 270 are positioned along the ground 160 as shown in FIG. 4(b), making it possible to easily overcome the step. EXAMPLES

[0039] Next, we will explain the outriggers that are mainly used when a material transport vehicle climbs a slope. Fig. 5 is a side view showing the outrigger in (a) the stored state and (b) the extended state. Fig. 6 is a side view (a) and a perspective view (b) showing the outrigger in a state where it touches the ground in a direction where it will climb a slope. Fig. 7 is a rear view (a) and a perspective view (b) showing the outrigger in a state where it touches the ground in a direction where it will cross a slope.

[0040] As shown in FIG. 5, the material transport vehicle 100 is equipped with electric outriggers 110 that protrude vertically from the loading platform 120 toward the underside of the slope 160a via a link mechanism in order to support the loading platform 120 in a horizontal position, particularly when climbing the slope 160a.

[0041] 5(a), the outriggers 110 are attached to the left and right ends of the bed 120, and have extendable legs on both the left and right sides. When stored, the tips are positioned higher than the ground 160, and each joint is bent so that they do not protrude laterally from the bed 120.

[0042] 5(b), the outrigger 110 has supports 110a at the left and right ends of the platform 120, with upper leg sections 110b extending downward from the middle (any position) of the support 110a, and lower leg sections 110c extending downward from the rear end of the support 110a. The upper leg sections 110b and lower leg sections 110c are each connected to a knee section 110d, and extend from the knee section 110d to a foot section 110e, and the tip of the foot section 110e can be thrust into the ground 160 or a slope 160a.

[0043] The degree to which the leg is stretched can be changed by rotating the support 110a in the forward and backward direction around the base of either the upper leg 110b or the lower leg 110c. If the ground 160 is flat, the tip of the foot 110e can be extended to the same position as the bottom surface of the crawler 200 that is on the ground.

[0044] In addition, by making the distance between the base of the upper leg 110b and the base of the lower leg 110c in the support 110a wider than the distance between the joint (joint) of the upper leg 110c and the joint (joint) of the lower leg 110c in the knee 110c, it functions as a link mechanism. Therefore, the position of the foot 110e is determined by controlling the angle of the base of the upper leg 110b.

[0045] 6, by extending the legs, it is possible to make the tip reach a position lower than the ground surface 160. When climbing up a slope 160a to a place where seedlings are to be planted, if the loading platform 120 is placed in a horizontal position, the rear end side of the loading platform 120 moves away from the slope 160a, so by extending both legs of the outriggers 110, it becomes possible to support the loading platform 120 against the slope 160a.

[0046] As shown in Fig. 7, when the place where the seedlings are to be planted is a slope 160a, the seedlings may be planted while moving sideways along the slope 160a. When trying to make the loading platform 120 horizontal, the vertical distance from the left side to the slope 160a is significantly different from the vertical distance from the right side to the slope 160a.

[0047] For example, in the case of a slope 160a that slopes downward from the right side to the left side of the material transport vehicle 100, the left leg that protrudes onto the lower slope 160a is extended far below the underside of the crawler 200, and the right leg that protrudes onto the upper slope 160a is positioned above the underside of the crawler 200, thereby keeping the loading platform 120 horizontal. EXAMPLES

[0048] Next, the outriggers used mainly when material transport vehicles cross slopes will be described. Figure 8 is a perspective view showing the outriggers in (a) the stored state and (b) the extended state. Figure 9 is a side view (a) and a rear view (b) showing the outriggers in the stored state. Figure 10 is a side view (a) and a rear view (b) showing the outriggers in a state where they are partially extended. Figure 11 is a side view (a) and a rear view (b) of the outriggers in an extended state. Figure 12 is a perspective view (a) and a rear view (b) showing the outriggers in a state where they are grounded on a slope. Figure 13 is a diagram explaining the movement trajectory of the outriggers.

[0049] As shown in FIG. 8, the material transport vehicle 100a is equipped with electric outriggers 300 that protrude vertically from the loading platform 120 toward the underside of the slope 160a via a link mechanism in order to support the loading platform 120 in a horizontal position not only when climbing the slope 160a but also when moving sideways up the slope 160a.

[0050] As shown in Fig. 8(a), the outrigger 300 is attached to the rear end side of the bed 120, and has extendable legs on both the left and right sides. When stored, the tip is positioned higher than the ground 160, and each joint is bent so that it does not protrude from the bed 120.

[0051] As shown in Fig. 8(b), by extending the legs, it is possible to make the tip reach a position considerably lower than the ground surface 160. When climbing up the slope 160a to the place where seedlings are to be planted, if the loading platform 120 is in a horizontal position, the rear end side of the loading platform 120 moves away from the slope 160a, so by extending both legs of the outriggers 300, it is possible to support the loading platform 120 in a vertical direction rather than perpendicular to the slope 160a.

[0052] If the slope 160a is steep, the outriggers 300 may not reach the ground 160 when the loading platform 120 is brought to a horizontal position. However, if the loading platform 120 is parallel to the slope 160a, the material transport vehicle 100a may tip over or seedlings or the like may fall off. Therefore, by bringing the loading platform 120 as close to a horizontal position as possible, the center of gravity can be moved in a more stable direction.

[0053] 9, the outrigger 300 has a support member 310 extending downward from the center of the rear end of the loading platform 120, with upper leg sections 320 extending from the middle (any height) of the support member 310 on the left and right, and lower leg sections 330 extending from the lower end of the support member 310 on the left and right. The upper leg section 320 and the lower leg section 330 are each connected to a knee section 340, which extends from the knee section 340 to a foot section 350, and the tip of the foot section 350 can be thrust into the ground 160 or a slope 160a.

[0054] 10, the degree to which the legs are extended can be changed by electrically rotating the base of the upper thigh 320 from the support 310. If the ground 160 is flat, the tip of the foot 350 can be extended to the same position as the bottom surface of the crawler 200 that is in contact with the ground.

[0055] In addition, it functions as a link mechanism by making the distance between the base of the upper leg 320 and the base of the lower leg 330 in the support 310 wider than the distance between the joint (joint) of the upper leg 320 and the joint (joint) of the lower leg 330 in the knee 340. Therefore, the position of the foot 350 is determined by controlling the angle of the base of the upper leg 320.

[0056] 11, in the case of the slope 160a, the front of the crawler 200 is in contact with the ground, so the tip of the foot 350 is further extended and thrust vertically. Depending on the orientation of the material transport vehicle 100, the direction of inclination changes, so the extent to which the left leg and the right leg are extended also differ.

[0057] As shown in Fig. 12, when the place where the seedlings are to be planted is a slope 160a, the seedlings may be planted while moving sideways along the slope 160a. When trying to make the loading platform 120 horizontal, the vertical distance from the left side to the slope 160a is significantly different from the vertical distance from the right side to the slope 160a.

[0058] For example, in the case of a slope 160a that slopes downward from the right side to the left side of the material transport vehicle 100, the left leg that protrudes onto the lower slope 160a is extended far below the underside of the crawler 200, and the right leg that protrudes onto the upper slope 160a is positioned above the underside of the crawler 200, thereby keeping the loading platform 120 horizontal.

[0059] As shown in FIG. 13, the position of the tip of the foot 350 changes depending on the angle of the base of the upper leg 320. When the foot 350 touches the ground, it is not perpendicular to the slope 160a, but is instead thrust vertically in the direction of gravity or slightly outward (away from the crawler 200), thereby making it possible to support the material transport vehicle 100 so that it does not fall over. EXAMPLES

[0060] Figure 14 shows the workload when working with a material transport vehicle. In a 25-degree slope of a afforestation site, 100 150cc containers of cedar seedlings were loaded onto a material transport vehicle 100, and 100 seedlings were planted. The seedlings were spaced 2.2m apart, and the planting density was 2000 seedlings / hectare.

[0061] As shown in Figure 14, the worker's work burden was quantified based on the worker's heart rate. The state in which the worker felt the most strain was defined as exercise intensity 100%, and the state in which the worker felt the most strain was defined as exercise intensity 0%, and exercise intensity was calculated as (heart rate during exercise - heart rate at rest) ÷ (maximum heart rate - heart rate at rest) × 100.

[0062] When the outrigger 300 was used, it took about 6 seconds for the outrigger 300 to touch down and be stored, but the time required for drilling a hole with the auger was shortened by 2 seconds, and the time required for compacting was shortened by 2.8 seconds. This is thought to be because the work can be performed with hands off the handle 140, and the work can be performed as a series of movements while holding the seedlings with hands from planting to compacting.

[0063] Since there is no need to hold the material transport vehicle 100 with one hand during work, the percentage of work time that the worker feels is difficult is reduced from 20% to about 6%, and an improvement in the workload is expected. Work safety is also improved because workers are not forced into unstable positions, such as holding the material transport vehicle 100 with one hand. Not only is the risk of the material transport vehicle 100 tipping over reduced, but the risk of it slipping due to unexpected lever operation is also reduced.

[0064] By using the material transport vehicle 100, it is possible to transport 60 kg seedlings on a 35 degree incline and overcome a 40 cm step. It is possible to transport 3 to 4 times as many seedlings as a human being can, improving productivity. Since the seedlings are transported by the material transport vehicle 100 and workers do not need to carry them on their backs when planting, the work time that workers find difficult is significantly reduced.

[0065] According to the present invention, the platform loaded with seedlings and the like can be maintained horizontally when traveling on flat ground or when climbing up a sloping, uneven terrain. When traveling on flat ground, the lower rollers of the crawler are in contact with the ground, but when traveling on a sloping, uneven terrain, the rollers rotate so that the crawler follows the slope. It is also possible to prevent the front of the crawler from lifting off the ground when traveling on flat ground.

[0066] Although the embodiments of the present invention have been described above, the present invention is not limited to these. For example, the same can be applied to a case where the arrangement of the sprocket and the idler is reversed. The rear roller may have the same structure as the front and middle rollers. Furthermore, a plurality of crawlers may be installed side by side. It is also possible to reduce the labor required for measuring the spacing between seedlings using a vehicle guidance app or the like, and to record the coordinates of the seedling positions after planting and use them for tending work such as weeding. [Explanation of symbols]

[0067] 100: Material transport vehicle 100a: Material transport vehicle 110: Outrigger 110a: Support material 110b: Upper leg 110c: lower leg 110d: Knee area 110e: Foot 120: Cargo bed 130: Frame material 140: Handle 150: Seedling box 160: Ground 160a: Slope 160b: Obstacle 200: Crawler 210: Support frame 220: Sprocket 230: Idler 240: Support shaft 250: Connecting material 260: Front roller 270: Medium roller 280: Rear roller 290: Shoe 300: Outrigger 310: Support material 320: Upper leg 330: Lower leg 340: Knee area 350: Foot

Claims

1. In material transport vehicles that can carry materials on the loading platform, a sprocket arranged at the rear end side under the loading platform and rotated by power, an idler arranged at the front end side under the loading platform, and a crawler in which a plurality of rollers are arranged side by side in a straight line between and below the sprocket and the idler are surrounded by a shoe in an annular shape; The rollers are connected by a connecting member between the rotary shaft of the front roller at the tip and the rotary shaft of the second middle roller, The connecting member has a support shaft passing therethrough so as to be rotatable up and down, When climbing a slope, the connecting member rotates so that the idler, the front roller, and the middle roller are aligned in a straight line. A track wheel structure for a material transport vehicle.

2. The connecting member has a support shaft passing through the center toward the front, The front roller is prevented from lifting up due to tension of the shoe when the vehicle is traveling on a flat surface.

2. The track roller structure of a material transport vehicle according to claim 1.

3. The crawler is a wheelbarrow with one shoe.

2. The track roller structure of a material transport vehicle according to claim 1.

4. A track roller structure according to any one of claims 1 to 3; and outriggers protruding downward from the loading platform to support the loading platform in a horizontal state when going up a slope. A material transport vehicle characterized by:

5. A track roller structure according to any one of claims 1 to 3; and an outrigger that protrudes vertically from the loading platform toward the lower side of the slope by a link mechanism in order to support the loading platform in a horizontal state in a direction for moving laterally on the slope. A material transport vehicle characterized by:

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