Crushed stone sorting tool

Abstract

To provide a crushed stone arrangement tool suitable for small-scale crushed stone removal and spreading work, which can be flexibly carried out by a small number of people. [Solution] A stone sorting tool comprising a claw that can rotate with the rotation of a rotating shaft, a driving means for rotating the rotating shaft, a gear box that houses the driving means and holds the rotating shaft rotatably, and a gripping portion connected to the gear box, wherein the stone sorting tool is characterized in that the claw is made of metal and has elasticity.

Description

[Technical field]

[0001] The present invention relates to a stone processing tool. [Background technology]

[0002] Crushed stone is laid under railway rails to form the trackbed. When the crushed stone needs replacing due to deterioration over time, or when replacing sleepers, work is required to remove the existing crushed stone and lay new crushed stone.

[0003] Conventionally, in the removal and spreading of crushed stone, large-sized devices mounted on rails are used, as described in Patent Documents 1 to 3.

[0004] When using conventional large equipment, it is necessary to pay a lot of effort to carry it in and out. Therefore, although it may be effective for large-scale construction such as laying new crushed stone in conjunction with large-scale construction such as laying new rails over long distances, it is not suitable for small-scale construction.

[0005] Therefore, there is a need for relatively small-scale crushed stone removal and laying work that can be carried out flexibly by a small number of people at locations where work is required, not only for the replacement of crushed stone on existing lines, but also for work such as laying new crushed stone in conjunction with the laying of new rails. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2020-7865 A [Patent Document 2] JP 2020-148052 A [Patent Document 3] JP 2019-35300 A Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made against this background, and has an object to provide a crushed stone sorting tool that can be flexibly carried out by a small number of people and is suitable for use in small-scale crushed stone removal and laying work. [Means for solving the problem]

[0008] In order to solve the above problems and achieve the above object, the present invention proposes the following means. A first aspect of the present invention is a stone sorting tool comprising a claw that can rotate in conjunction with the rotation of a rotating shaft, a driving means for rotating the rotating shaft, a gear box that houses the driving means and holds the rotating shaft rotatably, and a gripping portion connected to the gear box, wherein the claw is made of metal and has elasticity.

[0009] According to the first aspect of the present invention, since the claws are made of metal and have elasticity, when the claws come into contact with the crushed stone, an external force that is optimal for moving the crushed stone can be applied to the crushed stone from the claws, and since the claws rotate, an external force that is optimal for moving the crushed stone can be continuously applied to the crushed stone.

[0010] A second aspect of the present invention is a stone clearing tool according to the first aspect, characterized in that a plurality of the claws are provided, the plurality of claws are arranged point-symmetrically around the rotation shaft at equal positions along the length of the rotation shaft to form a claw unit, and the plurality of claw units are arranged along the length of the rotation shaft.

[0011] According to the second aspect of the present invention, the chances of the claws coming into contact with the crushed stone can be increased, and the crushed stone can be moved over a wide range along the length of the rotating shaft.

[0012] A third aspect of the present invention is a stone sorting tool in which, in the second aspect, the multiple claws are removably attached to the rotating shaft and removably installed along grooves formed in a bracket that rotates together with the rotating shaft, and are clamped in the longitudinal direction of the rotating shaft between the bracket and a bracket cover adjacent to the bracket in the longitudinal direction of the rotating shaft.

[0013] According to the third aspect of the present invention, the bracket, the claw, and the bracket cover are each provided detachably with respect to the rotation shaft, so that damaged brackets and claws can be easily replaced.

[0014] A fourth aspect of the present invention is a stone clearing tool according to the third aspect, wherein each of the multiple claws has a base extension extending radially from both ends of a base that are approximately perpendicular to the rotating shaft, an intermediate extension extending from the radial outer end of the base extension in a direction opposite to the rotational direction of the rotating shaft at an angle of 90° or less with the base extension, and a tip extending from the radial outer end of the intermediate extension to the radial outside of the rotating shaft in the rotational direction of the rotating shaft at an angle in the range of 90° to 180° with the intermediate extension.

[0015] According to the fourth aspect of the present invention, the tip of the claw abuts against the crushed stone so as to lift the crushed stone from below or to stroke the upper part of the crushed stone. By the tip abutting against the crushed stone from such a direction, an external force suitable for moving the crushed stone can be applied to the crushed stone.

[0016] A fifth aspect of the present invention is a stone sorting tool of the fourth aspect, characterized in that a gap is provided between the groove formed in the bracket and the base and base extension of the claw installed in the groove, allowing the base and the base extension to move in a direction perpendicular to the respective longitudinal directions of the base and the base extension.

[0017] According to the fifth aspect of the present invention, in addition to deformation due to the elasticity of the claw, deformation due to the claw moving through the gap between the groove and the claw can apply an external force to the crushed stone suitable for moving the crushed stone. Effect of the Invention

[0018] According to the present invention, a crushed stone processing tool can be provided that can be flexibly carried out by a small number of people and is suitable for use in small-scale crushed stone removal and laying work. [Brief description of the drawings]

[0019] [Figure 1] 1 is a schematic perspective view of a stone processing tool according to a first embodiment of the present invention; FIG. [Diagram 2] 1 is a front cross-sectional view of a stone processing tool according to a first embodiment of the present invention. FIG. [Diagram 3] 1 is an enlarged view of a main portion of a crushed stone processing tool according to a first embodiment of the present invention. FIG. [Figure 4] 1 is a cross-sectional view of a main portion of a crushed stone processing tool according to a first embodiment of the present invention. [Diagram 5] FIG. 2 is a front view of a claw unit of the stone processing tool of the first embodiment according to the present invention. [Figure 6] FIG. 2 is a front view of a bracket of the stone processing tool of the first embodiment according to the present invention. [Figure 7] 1 is a cross-sectional view of a bracket of a stone processing tool according to a first embodiment of the present invention. FIG. [Figure 8] FIG. 2 is a front view of a claw of the stone processing tool of the first embodiment according to the present invention. [Figure 9] FIG. 4 is a front cross-sectional view of a stone processing tool according to a second embodiment of the present invention. [Figure 10] FIG. 4 is an enlarged view of a main portion of a stone processing tool according to a second embodiment of the present invention. [Figure 11] 13 is a front view of a claw unit of a stone processing tool according to a second embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] First Embodiment Hereinafter, a stone processing tool E according to a first embodiment of the present invention will be described with reference to the drawings.

[0021] As shown in Figures 1 to 7, the stone processing tool E comprises a claw 2 that can rotate in conjunction with the rotation of a rotating shaft 7, a driving means M that rotates the rotating shaft 7, a gear box G that houses the driving means M and rotatably holds the rotating shaft 7, and a gripping portion 1 connected to the gear box G.

[0022] The crushed stone arrangement tool E is a device in which an operator (not shown) holds the gripping part 1 and moves the crushed stone by bringing the rotating claw 2 into contact with the crushed stone. In FIG. 1, the claw 2 rotates counterclockwise along the arrow shown in FIG. 1. In FIG. 5, the claw 2 rotates clockwise. By bringing the crushed stone arrangement tool E shown in FIG. 1 into contact with the crushed stone, the claw 2 rotating counterclockwise can continuously move the crushed stone toward the bottom of the gripping part 1 shown in FIG. 1. As a result, the spread crushed stone can be excavated. This type of work is applied, for example, when scraping out crushed stone between sleepers.

[0023] The grip part 1 may have any shape as long as it can be gripped by an operator. Although Fig. 1 shows the grip part 1 in a cylindrical shape, the grip part 1 is not limited to a cylindrical shape and may be a polygonal cylindrical shape or an elliptical cylindrical shape.

[0024] The grip portion 1 is connected to a gear box G. The connection method is not limited to any particular method, but may be, for example, fastened with bolts and nuts (not shown).

[0025] The gearbox G houses the driving means M and the rotating shaft 7. The driving means M shown in FIG. 2 is a motor that rotates the rotating shaft 7 shown in FIG. 4 around the central axis O. Here, the driving means M does not necessarily have to be a motor, and may be an engine. A battery when the driving means M is a motor and a fuel tank when the driving means M is an engine are not shown, but may be provided in the gripping part 1, or may be provided outside the stone processing tool E and connected to the motor or engine of the stone processing tool E via a power cord or fuel pipe (not shown). The rotation speed of the driving means M may be adjustable.

[0026] The rotating shaft 7 is a cylindrical member that can be rotated around its central axis O by the driving means M. The rotating shaft 7 is provided in a gear box G, and is rotatably housed in the gear box G by a known bearing member such as a ball bearing. In addition, a key that fits into a key groove, which will be described later, is provided on the outer circumferential surface of the rotating shaft 7. In addition, both ends of the rotating shaft 7 are formed into a cylindrical shape as described later, and a screw groove is formed on the inner circumferential surface of this cylindrical rotating shaft 7, into which a fastening means 8, which will be described later, can be screwed. A worm wheel WW fixed to the rotating shaft 7 is provided at approximately the center in the longitudinal direction of the rotating shaft 7. Meanwhile, the rotational force output from the driving means M rotates the worm W which rotates together with the output shaft of the driving means M. Furthermore, as shown in Fig. 2, the worm W and the worm wheel WW are engaged with each other, so that when the worm W rotates, the worm wheel WW rotates, and the rotating shaft 7 rotates in accordance with the rotation of the worm wheel WW. As shown in Figs. 1 and 2, the gear box G is provided with a bulge 5 for accommodating the worm wheel WW and a housing portion 6 in which the driving means M is provided. The rotating shaft 7 may have a cylindrical shape with a part formed as a square prism. For example, in order to suppress the relative circumferential positional movement between the rotating shaft 7 and the brackets 4, 4' and bracket lids 3a, 3b described below, the longitudinal portion of the rotating shaft 7 where the brackets 4, 4' and bracket lids 3a, 3b are present (both ends of the rotating shaft 7) may be formed as a square prism when the brackets 4, 4' and bracket lids 3a, 3b are attached to the rotating shaft 7. In this case, it is possible to suppress the relative circumferential positional movement between the rotating shaft 7 and the brackets 4, 4' and bracket lids 3a, 3b without providing a key groove. Furthermore, both ends of the cylindrical rotating shaft 7 may be formed into a cylindrical shape. This is so that a fastening member 8 (e.g., a flat head bolt) described below can be fastened to both ends of the rotating shaft 7. In this case, a female thread that can be screwed into the fastening member 8 may be formed on the inner periphery of the cylindrical portion on both ends of the rotating shaft 7. Note that even when both ends of the rotating shaft 7 are formed into a square pillar, a female thread that can be screwed into the fastening member 8 may be formed on the square pillar portion.

[0027] As shown in FIG. 4, the rotating shaft 7 is provided on the outer periphery of the cylindrical brackets 4, 4' and bracket covers 3, 3a, 3b at the center thereof, and the rotating shaft 7 is inserted through a hole h, so that the brackets 4, 4' and bracket covers 3, 3a, 3b are stacked in the longitudinal direction of the rotating shaft 7. Since a key groove is provided in the hole h, the key of the rotating shaft 7 engages with the key groove of the bracket 4, thereby rotating the bracket 4 with the rotation of the rotating shaft 7. Note that, when the cylindrical rotating shaft 7 has the brackets 4, 4' and bracket covers 3a, 3b attached to the rotating shaft 7, the portion of the rotating shaft 7 in the longitudinal direction where the brackets 4, 4' and bracket covers 3a, 3b are present is formed into a square pillar, it is not necessary to provide a key groove.

[0028] As shown in FIG. 6, which is a front view of the bracket 4, a groove g in which the claw 2 can be installed is provided on the bottom surface A1 on one side of the bracket 4. In the example of FIG. 6, three grooves g are provided. The grooves g are provided so as to be point symmetrical with respect to the central axis O. More specifically, the groove g is composed of a base g1 that is approximately perpendicular to the central axis O and is longer than the diameter of the hole h, and extensions g2 and g3 that extend from both ends of the base g1 in the radial direction of the central axis O. The extensions g2 and g3 are provided so as to form an angle of approximately 60° with each other. Here, as shown in FIG. 7, in a cross section of the bracket 4 cut in a direction along the central axis O, the cross-sectional shape of the groove g is a semicircular tip and a rectangular opening side. Although details will be described later, the width of the groove g perpendicular to the length direction of the groove g (the vertical width of the groove g in FIG. 7) is larger than the diameter of the claw 2 installed in the groove g.

[0029] In the example of Figs. 1, 3, and 4, three brackets 4 are stacked on each side of the gearbox G (the front side and the back side in Fig. 1) on the rotating shaft 7 extending along the central axis O, with the gearbox G at the center. More specifically, two brackets 4 and one bracket 4' are stacked. Here, the bracket 4' is a bracket 4 that is installed with the front and back of the bracket 4 reversed, and is referred to as bracket 4'. As shown in Fig. 3, a disk-shaped bracket cover 3 is provided on the gearbox G side of the bracket 4' closest to the gearbox G and on the side furthest from the gearbox G of the bracket 4 furthest from the gearbox G so as to cover the bracket 4' and the bracket 4. As shown in Fig. 4, a tapered hole t is provided in the bracket cover 3, which communicates with the hole h provided in the bracket 4' and the bracket 4, has a minimum diameter smaller than the hole h, and can insert a fastening member 8. A bracket cover 3a is provided between the bracket 4 provided inside the bracket 4 furthest from the gearbox G and the bracket 4 furthest from the gearbox G. A bracket cover 3b is provided between the bracket 4 that is provided on the outer side of the bracket 4' that is closest to the gearbox G and the bracket 4' that is closest to the gearbox G. The length (thickness) of the rotation shaft 7 of the bracket cover 3 and the bracket cover 3b is approximately the same, but the length (thickness) of the rotation shaft 7 of the bracket cover 3a is approximately three times the length (thickness) of the rotation shaft 7 of the bracket cover 3 and the bracket cover 3b. With this configuration, the spacing between the claws 2 in the length direction of the rotation shaft 7 is approximately the same. Therefore, there is no bias in the external force applied to the crushed stone from the claws 2, and the crushed stone can be moved efficiently. The bracket cover 3 and the bracket cover 3b may be the same member.

[0030] The claw 2 is installed in a groove g provided in the bracket 4 and the bracket 4', covers the bracket 4 and bracket 4' in which the claw 2 is installed, and is fixed by being clamped between the bracket covers 3, 3a adjacent to the brackets 4, 4' and the brackets 4, 4' in the longitudinal direction of the rotating shaft 7. Specifically, as shown in FIG. 4, a fastening member 8 (flat head bolt) is inserted into the inner circumference of the rotating shaft 7 through a tapered hole t of the bracket cover 3 provided on the side farthest from the gearbox G of the bracket 4 farthest from the gearbox G and screwed into a female screw groove formed on the inner circumference surface of the rotating shaft 7, thereby fastening the bracket 4' and the bracket 4 and the bracket covers 3, 3a, and 3b adjacent to each other in the length direction of the rotating shaft 7, and firmly fixing them to the rotating shaft 7. Here, the bracket cover 3 closest to the gearbox G is formed so that the diameter of the rotating shaft 7 on the inner side (the side closer to the gearbox G) of the bracket cover 3 closest to the gearbox G is larger than the diameter of the hole h provided in the bracket cover 3 so that the bracket cover 3 cannot move any further inward (toward the gearbox G). Because of this configuration, the bracket 4' and the bracket 4, the claw 2, and the bracket covers 3, 3a, and 3b can be taken out from the rotating shaft 7 by loosening the fastening member 8 and pulling it out from the rotating shaft 7. In this manner, the claw 2, the bracket 4', the bracket 4, and the bracket covers 3, 3a, and 3b are detachably provided on the rotating shaft .

[0031] As shown in FIG. 5, the claw 2 is placed in a groove g provided in the bracket 4 or a groove g provided in the bracket 4'. In FIG. 5, the claw 2 rotates clockwise. The claw 2 is made of metal and has elasticity. The material of the claw 2 is not particularly limited as long as the claw 2 is made of metal and has elasticity. For example, the claw 2 is formed of spring steel having a diameter of about 5 mm and a substantially circular cross section.

[0032] 5 and 8, the claw 2 includes a base end extension 21 extending in the radial direction of the central axis O or the rotation shaft 7 from both ends of the base 2B that are substantially perpendicular to the central axis O or the rotation shaft 7, an intermediate extension 22 extending from a radially outer end of the base end extension 21 in a direction opposite to the rotation direction of the rotation shaft 7 at an angle of 90° or less with the base end extension 21, and a tip end 23 extending from a radially outer end of the intermediate extension 22 to the radially outer side of the central axis O or the rotation shaft 7 at an angle in the range of 90° to 180° with the intermediate extension 22. The length of the intermediate extension 22 is, for example, about 85 mm.

[0033] The base 2B of the claw 2 is placed at the base g1 of the groove g, and the base end extension 21 of the claw 2 is placed at the extensions g2 and g3 of the groove g.

[0034] As shown in Fig. 5, three sets of claws 2 are provided in three sets of grooves g of the bracket 4. The three sets of claws 2 provided on the bracket 4 are called a claw unit. That is, the claw unit is composed of a plurality of claws 2 arranged point-symmetrically around the rotation shaft 7 at approximately equal positions in the longitudinal direction of the rotation shaft 7, as shown in Fig. 1.

[0035] As shown in FIG. 1, three claw units are provided in the longitudinal direction of the rotating shaft 7 on each side of the gear box G (the front side and the back side in FIG. 1) with the gear box G at the center.

[0036] According to the crushed stone sorting tool E having the above-mentioned configuration, the bracket 4', bracket 4, claw 2, and bracket cover 3, 3a, 3b can be removed from the rotating shaft 7 by loosening the fastening member 8 and pulling it out from the hole h, so that the claw 2 which becomes deformed or damaged due to use can be easily replaced. Also, the width of the groove g is larger than the diameter of the claw 2 placed in the groove g. Therefore, between the groove g formed in the bracket 4' and the bracket 4, and the base 2B and the base end extension 21 of the claw 2 placed in the groove g, a gap is provided through which the base 2B and the base end extension 21 can move in a direction perpendicular to the length direction of the base 2B and the base end extension 21. More specifically, between the base g1 of the groove g and the base 2B of the claw 2 placed on the base g1, a gap is provided through which the base 2B can move in a direction perpendicular to the length direction of the base 2B. Also, between the extensions g2 and g3 of the groove g and the base end extension 21 placed on the extensions g2 and g3, a gap is provided through which the base end extension 21 can move in a direction perpendicular to the length direction of the base end extension 21.

[0037] According to this configuration, when the claw 2 abuts against the crushed stone, the claw 2 bends due to the elasticity of the claw 2, so that an appropriate external force can be applied to the crushed stone. Furthermore, since the gap as described above is provided between the claw 2 and the groove g, in addition to the bending due to the elasticity of the claw 2 itself, the claw 2 can escape in the opposite direction to the direction in which the claw 2 rotates relative to the crushed stone by the amount of movement of the claw 2 between the gap when the claw 2 abuts against the crushed stone. More specifically, when the claw 2 abuts against the crushed stone, the claw 2 can escape in the opposite direction to the direction in which the claw 2 rotates relative to the crushed stone, in a range from the boundary between the base 2B and the base end extension 21 of the claw 2 as the center until the base end extension 21 of the claw 2 abuts against the inner peripheral surface of the extension g2 or extension g3 of the groove g. Therefore, an even more appropriate external force can be applied to the crushed stone. Crushed stones have the property that when a strong force is applied, the pieces of the stone are firmly fixed together. In other words, when the weight of a vehicle running on the rails is applied to the crushed stones through the rails and sleepers, the pieces of the stone are firmly bound together and stably support the sleepers. Therefore, when moving crushed stones, applying too strong a force is inappropriate as it induces the pieces of the stone to be strongly bound together, so it is necessary to apply an external force that is not too strong and is appropriate. According to the crushed stone arrangement tool E of this embodiment, it is possible to apply an appropriate external force to the crushed stone. Therefore, it is suitable for use in small-scale crushed stone removal and spreading work that can be flexibly performed by a small number of people. In addition, according to the shape of the claws 2 of the crushed stone arrangement tool E of this embodiment, the tip 23 of the claws 2 abuts against the crushed stone so as to lift the crushed stone from below or to stroke the upper part of the crushed stone. By the tip 23 abutting against the crushed stone from such a direction, an external force suitable for moving the crushed stone can be applied to the crushed stone.

[0038] Furthermore, the claw 2 is provided with a tip portion 23 that extends from a radially outer end of the intermediate extension portion 22 to the radially outer side of the central axis O or the rotation shaft 7 so as to form an angle (hereinafter referred to as angle A) in the range of 90° to 180° with the intermediate extension portion 22. Therefore, according to the law of action and reaction, when the tip portion 23 of the claw 2 comes into contact with the crushed stone, the tip portion 23 of the claw 2 applies an external force F to the crushed stone, and at the same time, an external force F is applied from the crushed stone to the tip portion 23 of the claw 2. At this time, since the tip portion 23 extends from the radially outer end of the intermediate extension portion 22 of the claw 2 to the radially outer side of the central axis O or the rotation axis 7 so as to form an angle in the range of 90° to 180° with the intermediate extension portion 22, of the external force F applied from the crushed stone to the tip portion 23 of the claw 2, the component force contributing to the moment of the force that rotates the intermediate extension portion 22 around the boundary between the intermediate extension portion 22 and the base end extension portion 21 as the center of rotation is smaller than the external force F. That is, in a virtual right-angled triangle (not shown) having the tip portion 23 as the long side, a side perpendicular to the intermediate extension portion 22, and a side parallel to the intermediate extension portion 22, of the external force F corresponding to the length of the tip portion 23, the component force contributing to the moment of the force is resolved into the length of the side perpendicular to the intermediate extension portion 22, so that the load applied to the claw 2 can be reduced. As described above, angle A is preferably in the range of 90° to 180°, more preferably in the range of 105° to 160°, and even more preferably in the range of 120° to 135°. In addition, the intermediate extension 22 extends from the radially outer end of the base end extension 21 in the opposite direction to the rotation direction of the rotating shaft 7, forming an angle of 90° or less with the base end extension 21 (hereinafter referred to as angle B). Therefore, the moment of force that rotates the intermediate extension 22 acts in a direction that reduces the angle between the radially inner end of the intermediate extension 22 and the radially outer end of the base end extension 21. The elasticity of the claw 2 appropriately receives the deformation caused by the rotation of the intermediate extension 22 and pushes it back appropriately, so that an external force suitable for moving the crushed stone can be applied to the crushed stone. As described above, angle B is preferably 90° or less, more preferably less than 85°, and even more preferably less than 80°. Here, as shown in Figure 5, the boundary between the base 2B of the claw 2 and the base end extension 21, the boundary between the base end extension 21 and the intermediate extension 22, and the boundary between the intermediate extension 22 and the tip 23 may be rounded to prevent stress from concentrating at these boundaries.

[0039] <Second embodiment> Hereinafter, a stone processing tool E' according to a second embodiment of the present invention will be described with reference to the drawings. The same structures as those of the stone processing tool E of the first embodiment are given the same reference numerals, and their explanation is omitted. Only the points that are different from the first embodiment will be explained.

[0040] 9 is a front cross-sectional view of a stone processing tool E' according to a second embodiment of the present invention. The stone processing tool E of the first embodiment has a structure in which a rotation axis 7 extends substantially perpendicular to the length direction of the gripping part 1, whereas the stone processing tool E' of the second embodiment is different in that a rotation axis 9 is provided substantially parallel to the extension direction of the gripping part 1'.

[0041] More specifically, the driving means M is provided on the tip side of the gripping part 1' (the lower side in FIG. 9, i.e., the side closer to the claw 2). The bevel gear UG1 provided on the tip side of the driving means M (the lower side in FIG. 9, i.e., the side closer to the claw 2) rotates around the length direction (central axis) L1 of the gripping part 1' as the center of rotation. The bevel gear BG rotates around the central axis L2 that is approximately parallel to the length direction L1 of the gripping part and is stored in the gear box G' and meshes with the bevel gear UG1. The bevel gear BG meshes with a bevel gear UG2 different from the bevel gear UG1. The bevel gear UG2 is connected to a rotating shaft 9 that rotates around the central axis L3 that rotates the claw 2. With this structure, the rotational force of the driving means M is transmitted as the rotational force of the rotating shaft 9, and the claw 2 is rotated around the central axis L3.

[0042] In the example of FIG. 9, a bracket 4', a bracket 4, and two bracket covers 3 are provided on a rotating shaft 9, and three claw units are sandwiched between them. As in the first embodiment, the clamping method is to screw a fastening member 8 inserted into the inner peripheral surface of the rotating shaft 9 from the outside (the lower side in FIG. 9, i.e., the side closer to the crushed stone) of the bracket cover 3 provided on the side farthest from the gripping portion 1' into a screw groove formed on the inner peripheral surface of the cylindrical rotating shaft 9, thereby clamping the units. Here, in the example of FIG. 9, the bracket 4' closest to the gear box G has grooves g on both bottom surfaces A and B, and has a cylindrical shape that is longer along the central axis O than the bracket 4 adjacent to the bracket 4 on the side farther from the gear box G than itself. In the example of Figure 9, as shown in Figure 11, intermediate extension portion 22 extends from the radially outer end of base end extension portion 21 in the opposite direction to the rotational direction of the rotating shaft 9, forming an angle of approximately 90° with base end extension portion 21, and tip portion 23 extends from the radially outer end of intermediate extension portion 22 radially outward from the central axis O or the rotating shaft 9, forming an angle of approximately 90° with intermediate extension portion 22.

[0043] As shown in FIG. 10, which shows the stone processing tool E' viewed from the left side of FIG. 9, the central axes L2 and L3 may intersect with the central axis L1.

[0044] According to the crushed stone arrangement tool E' of the second embodiment, the rotation plane formed by the rotating claws 2 is approximately parallel to the horizontal plane (ground surface). For example, the crushed stone arrangement tool E' of the second embodiment can be inserted into a hole in the crushed stone created by digging the crushed stone between the sleepers using the crushed stone arrangement tool E of the first embodiment, and the crushed stone can be further excavated in a direction approximately perpendicular to the hole (approximately parallel to the ground surface). In this way, the crushed stone can be mainly scraped out from under the sleepers.

[0045] According to the configuration of the crushed stone arrangement tool E' of the second embodiment, the same effect as that of the crushed stone arrangement tool E of the first embodiment is achieved. That is, when the claw 2 abuts against the crushed stone, the claw 2 bends due to the elasticity of the claw 2, and an appropriate external force can be applied to the crushed stone. Furthermore, since a gap is provided between the claw 2 and the groove g, in addition to bending due to the elasticity of the claw 2 itself, the claw 2 moves between the gap. Therefore, when the claw 2 abuts against the crushed stone, the claw 2 can escape in the opposite direction to the direction in which the claw 2 rotates relative to the crushed stone. More specifically, when the claw 2 abuts against the crushed stone, the claw 2 can escape in the range from the boundary between the base 2B and the base end extension 21 of the claw 2 to the inner peripheral surface of the extension g2 or extension g3 of the groove g in the opposite direction to the direction in which the claw 2 rotates relative to the crushed stone. Therefore, an even more appropriate external force can be applied to the crushed stone. Crushed stones have the property that when a strong force is applied, the pieces of the stone are firmly fixed together. In other words, when the weight of a vehicle running on the rails is applied to the crushed stones through the rails and sleepers, the pieces of the stone are firmly bound together and stably support the sleepers. Therefore, when moving crushed stones, applying too strong a force is inappropriate as it induces the pieces of the stone to be strongly bound together, so it is necessary to apply an external force that is not too strong and is appropriate. According to the crushed stone arrangement tool E' of this embodiment, it is possible to apply an appropriate external force to the crushed stones. Therefore, it is suitable for use in small-scale crushed stone removal and spreading work that can be flexibly performed by a small number of people. In addition, according to the shape of the claws 2 of the crushed stone arrangement tool E' of this embodiment, the tip 23 of the claws 2 abuts against the crushed stone so as to lift the crushed stone from below or to stroke the upper part of the crushed stone. By the tip 23 abutting against the crushed stone from such a direction, an external force suitable for moving the crushed stone can be applied to the crushed stone.

[0046] Although the first and second embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the above-mentioned embodiments. The shapes and combinations of the components shown in the above-mentioned embodiments are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention.

[0047] For example, one claw 2 may be provided on one bracket 4, or multiple claws 2 may be provided on one bracket 4. That is, two claws 2 may be provided on one bracket 4, or four or more claws 2 may be provided. The brackets 4 equipped with the claw units or claws 2 are not limited to three brackets 4 stacked on one side of the gearbox G (the front side and the back side in FIG. 1) with the gearbox G at the center, but may be one or any number of brackets 4 stacked, two or more. The length of the rotation shaft 7 may be extended according to the number of brackets 4 stacked. The fastening member 8 is not limited to a flat head bolt, and may be any known bolt capable of fastening the bracket 4 and the bracket cover 3 together. Although the claws 2 are described as being formed from spring steel having a substantially circular cross section with a diameter of about 6 mm, the present invention is not limited to this, and the claws 2 may be formed from spring steel having a substantially circular cross section with a diameter of about 5 mm. In the example of Figure 9, the bracket 4' closest to the gearbox G has grooves g on both bottom surfaces A and B, but the bracket 4 closest to the gearbox G may also be a bracket 4 having grooves g only on the bottom surface A. The material of the bracket 4 may be resin or a metal such as aluminum. In the above description, there are descriptions such as approximately perpendicular, about 6 mm, or about 5 mm. This is to clarify that it is not necessary to be strictly perpendicular, and it is not necessary to be exactly 6 mm. Approximately perpendicular includes, for example, about ±2 to 3° from a right angle, and about 6 mm and about 5 mm may include up to about ±0.25 mm. In addition, it has been described that the length of the intermediate extension portion 22 is, for example, about 85 mm, but is not limited to this example and may be set appropriately. [Explanation of symbols]

[0048] 1 Gripping part 2 Claws 3, 3a, 3b Bracket cover 4, 4' bracket 7, 9 Rotation Axis 8 Fastening members E, E' Stone sorting tool G Gearbox O center axis

Claims

1. A drive means for rotating its output shaft; A rotating shaft extending along a central axis and rotated by the transmission of a rotational force of the output shaft; A claw that is rotatable in association with the rotation of the rotary shaft; a gear box that houses the driving means and rotatably holds the rotary shaft; a gripping portion coupled to the gear box, The claw is made of metal and has elasticity, a plurality of the claws are provided, the plurality of claws are arranged point-symmetrically around the rotation shaft at equal positions in the longitudinal direction of the rotation shaft to form a claw unit, and the plurality of the claw units are arranged along the longitudinal direction of the rotation shaft; This stone sorting tool is characterized in that the multiple claws are removably attached to the rotating shaft and removably installed along grooves formed in a bracket that rotates together with the rotating shaft, and are clamped in the longitudinal direction of the rotating shaft between the bracket and a bracket cover adjacent to the bracket in the longitudinal direction of the rotating shaft.

2. The stone sorting tool described in claim 1, characterized in that each of the multiple claws comprises a base extension extending radially of the rotating shaft from both ends of a base that is approximately perpendicular to the rotating shaft, an intermediate extension extending from the radially outer end of the base extension in a direction opposite to the rotational direction of the rotating shaft at an angle of 90° or less with the base extension, and a tip extending from the radially outer end of the intermediate extension to the radially outward side of the rotating shaft in the rotational direction of the rotating shaft at an angle in the range of 90° to 180° with the intermediate extension.

3. A stone sorting tool as described in Claim 2, characterized in that a gap is provided between the groove formed in the bracket and the base and base extension of each of the multiple claws installed in the groove, allowing the base and the base extension to move in a direction perpendicular to the respective longitudinal directions of the base and the base extension.

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