Crushed stone sorting tool

Abstract

To provide a crushed stone sorting 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 crushed stone sorting tool includes a claw that can rotate in conjunction with the rotation of a rotating shaft, driving means for rotating the rotating shaft, a gear box that houses the driving means and holds the rotating shaft rotatably, and a gripping part connected to the gear box; the claw is made of metal and elastic.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a crushed stone arranging tool.

Background Art

[0002] Under the railway rails, crushed stones are spread to form a roadbed. When replacing the crushed stones to cope with the aging deterioration of the crushed stones or when replacing the sleepers, operations for removing the existing crushed stones and spreading new crushed stones occur.

[0003] In the conventional operations for removing and spreading crushed stones, large-sized devices placed on the rails as described in Patent Documents 1 to 3 are used.

[0004] When using the conventional large-sized devices, it is necessary to expend a great deal of labor for carrying in and out the large-sized devices. Therefore, it may be effective in construction work for spreading new crushed stones accompanying large-scale construction work for laying new rails over a long distance, but it is not suitable for carrying out small-scale construction work.

[0005] Therefore, not only in the operation of replacing the crushed stones of the existing line, but also in construction work for spreading new crushed stones accompanying construction work for laying new rails, it is desired to carry out relatively small-scale operations for removing and spreading crushed stones that can be flexibly carried out by a small number of people at the locations where the work is required.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] The present invention has been made under such a background, and an object thereof is to provide a crushed stone arranging tool suitable for use in small-scale crushed stone extraction work and spreading work that can be flexibly carried out by a small number of people.

Means for Solving the Problems

[0008] In order to solve the above problems and achieve such an object, the present invention proposes the following means. A first aspect of the present invention includes a claw rotatable with the rotation of a rotating shaft, a driving means for rotating the rotating shaft, a gear box for housing the driving means and rotatably holding the rotating shaft, and a gripping portion connected to the gear box, and is characterized in that the claw is made of metal and has elasticity.

[0009] According to the first aspect of the present invention, since the claw is made of metal and has elasticity, when the claw abuts on the crushed stone, an external force optimal for the movement of the crushed stone can be applied from the claw to the crushed stone, and since the claw is rotating, an external force optimal for the movement of the crushed stone can be continuously applied to the crushed stone.

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

[0011] According to the second aspect of the present invention, the opportunity for the claw to abut on the crushed stone can be increased, and the crushed stone can be moved in a wide range extending in the length direction of the rotating shaft.

[0012] According to a third aspect of the present invention, in the second aspect, the plurality of claws are detachably provided along a groove formed in a bracket that is detachably provided on the rotation axis and rotates together with the rotation axis, and are sandwiched in the longitudinal direction of the rotation axis by a bracket lid adjacent to the bracket in the longitudinal direction of the rotation axis and the bracket. The gravel finishing tool is characterized in that it is.

[0013] According to the third aspect of the present invention, since each of the bracket, the claw, and the bracket lid is detachably provided with respect to the rotation axis, it is possible to easily replace a damaged bracket or claw.

[0014] According to a fourth aspect of the present invention, in the third aspect, each of the plurality of claws includes a proximal end extension extending in the radial direction of the rotation axis from both ends of a base portion substantially orthogonal to the rotation axis, and the proximal end extension. An intermediate extension extending at an angle of 90° or less with respect to the proximal end extension in a direction opposite to the rotation direction of the rotation axis from an outer end portion in the radial direction of the proximal end extension, and an outer end portion in the radial direction of the intermediate extension. A tip portion extending so as to form an angle in the range of 90° to 180° with respect to the intermediate extension on the outer side in the radial direction of the rotation axis in the rotation direction of the rotation axis, and is characterized by being a gravel finishing tool.

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

[0016] According to a fifth aspect of the present invention, in the fourth aspect, between the groove formed in the bracket and the base portion and the proximal end extension of the claw installed in the groove, the base portion and the proximal end extension are provided. A gravel finishing tool is characterized in that a gap is provided that is movable in a direction perpendicular to the longitudinal direction of each of the base portion and the proximal end extension.

[0017] According to the fifth aspect of the present invention, in addition to the deformation due to the elasticity of the claw, an external force suitable for the movement of the crushed stone can be applied to the crushed stone by the deformation caused by the movement of the claw by the amount of the gap between the groove and the claw.

Advantages of the Invention

[0018] According to the present invention, it is possible to provide a crushed stone arranging tool suitable for use in small-scale crushed stone extraction work and spreading work that can be flexibly carried out by a small number of people.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Modes for Carrying Out the Invention

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

[0021] As shown in FIGS. 1 to 7, the crushed stone arranging tool E includes claws 2 that can rotate as the rotating shaft 7 rotates, 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 arranging tool E is a device in which an operator (not shown) grips the gripping portion 1 and abuts the rotating claws 2 against the crushed stones to move the crushed stones. In FIG. 1, the claws 2 rotate counterclockwise along the arrow shown in FIG. 1. In FIG. 5, the claws 2 rotate clockwise. By bringing the crushed stone arranging tool E shown in FIG. 1 into contact with the crushed stones, the claws 2 rotating counterclockwise can continuously move the crushed stones downward toward the gripping portion 1 shown in FIG. 1. As a result, the laid crushed stones can be excavated. Such an operation is applied, for example, when scraping out the crushed stones between the sleepers.

[0023] The gripping portion 1 may have any shape that can be gripped by an operator. FIG. 1 shows the case where the gripping portion 1 is cylindrical, but the gripping portion 1 is not limited to a cylindrical shape and may be a polygonal cylindrical shape or an elliptical cylindrical shape.

[0024] The gripping portion 1 is connected to the gear box G. The connection method is not limited in some cases. For example, it is fastened with bolts and nuts (not shown).

[0025] The gear box G houses a driving means M and a rotating shaft 7. The driving means M shown in Fig. 2 is a motor that rotates the rotating shaft 7 shown in Fig. 4 about the central axis O as the center of rotation. Here, the driving means M does not necessarily have to be a motor and may be an engine. The battery when the driving means M is a motor and the fuel tank when the driving means M is an engine are not shown in the figures, but may be provided in the gripping portion 1 or may be provided outside the crushed stone sorting device E and connected to the motor or engine of the crushed stone sorting device E via a power cord or fuel pipe (not shown). Also, the rotational speed of the driving means M may be adjustable.

[0026] The rotating shaft 7 is a cylindrical member that is rotated about its central axis O by the driving means M. The rotating shaft 7 is provided inside the gear box G and is rotatably housed inside the gear box G by a known bearing member such as a ball bearing. Also, a key that fits into a key groove described later is provided on the outer peripheral surface of the rotating shaft 7. Further, both ends of the rotating shaft 7 are formed in a cylindrical shape as described later, and a screw groove is formed on the inner peripheral surface of this cylindrical rotating shaft 7, and a fastening means 8 described later can be screwed into this screw groove. A worm wheel WW fixed to the rotating shaft 7 is provided at a substantially central portion in the length direction of the rotating shaft 7. On the other hand, the rotational force output from the driving means M rotates a worm W that rotates together with the output shaft of the driving means M. Further, as shown in Fig. 2, since the worm W and the worm wheel WW are engaged with each other, when the worm W rotates, the worm wheel WW rotates, and the rotating shaft 7 rotates as the worm wheel WW rotates. As shown in Figs. 1 and 2, the gear box G is provided with a bulging portion 5 for housing the worm wheel WW and a housing portion 6 for the driving means M. Note that a part of the rotating shaft 7 may be a quadrangular prism in the shape of a cylinder. For example, in order to suppress the relative circumferential movement of the rotating shaft 7 and the brackets 4, 4' and the bracket covers 3a, 3b described later, with the brackets 4, 4' and the bracket covers 3a, 3b attached to the rotating shaft 7, the lengthwise portions (both ends of the rotating shaft 7) of the rotating shaft 7 where the brackets 4, 4' and the bracket covers 3a, 3b are located may be formed as quadrangular prisms. In this case, even without providing a key groove, the relative circumferential movement between the rotating shaft 7 and the brackets 4, 4' and the bracket covers 3a, 3b can be suppressed. Also, both ends of the cylindrical rotating shaft 7 may be formed in a cylindrical shape. This is to enable fastening of the fastening members 8 (for example, socket head cap screws) described later to both ends of the rotating shaft 7. In this case, female threads that can be screwed with the fastening members 8 may be formed on the inner circumferences of the cylindrical portions at both ends of the rotating shaft 7. Note that even when both ends of the rotating shaft 7 are formed as quadrangular prisms, female threads that can be screwed with the fastening members 8 may be formed on the quadrangular prism portions.

[0027] As shown in FIG. 4, on the outer circumference of the rotating shaft 7, a plurality of brackets 4, 4' and bracket covers 3, 3a, 3b are provided so as to be laminated in the lengthwise direction of the rotating shaft 7 by passing the rotating shaft 7 through holes h provided at the centers of the cylindrical brackets 4, 4' and the bracket covers 3, 3a, 3b and through which the rotating shaft 7 can be inserted. Since key grooves are provided in the holes h, the key on the rotating shaft 7 meshes with the key groove of the bracket 4, thereby rotating the bracket 4 as the rotating shaft 7 rotates. Note that in the case where the lengthwise portions of the rotating shaft 7 where the brackets 4, 4' and the bracket covers 3a, 3b are located are formed as quadrangular prisms with the brackets 4, 4' and the bracket covers 3a, 3b attached to the rotating shaft 7, 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 to be point-symmetrical with respect to the central axis O. More specifically, the groove g is composed of a base g1 that is substantially orthogonal to the central axis O and longer than the diameter of the hole h, and extensions g2, g3 that extend in the radial direction of the central axis O from both ends of the base g1. 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 along the direction of the central axis O, the cross-sectional shape of the groove g has a semi-circular 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 examples of FIGS. 1, 3, and 4, on the rotation shaft 7 extending along the central axis O, with the gear box G as the center, three brackets 4 are stacked on each side of the gear box G (the front side and the back side in FIG. 1 respectively). More specifically, two brackets 4 and one bracket 4' are stacked. Here, the bracket 4' is a bracket 4 installed with the front and back reversed, and is denoted as bracket 4'. As shown in FIG. 3, a disc-shaped bracket cover 3 is provided to cover the bracket 4' and the bracket 4 on the gear box G side of the bracket 4' closest to the gear box G and on the side farthest from the gear box G of the bracket 4 farthest from the gear box G. As shown in FIG. 4, a tapered hole t that communicates with the holes h provided in the bracket 4' and the bracket 4 and has a minimum diameter smaller than that of the hole h and into which the fastening member 8 can be inserted is provided in the bracket cover 3. A bracket cover 3a is provided between the bracket 4 provided inside the bracket 4 farthest from the gear box G and the bracket 4 farthest from the gear box G. A bracket cover 3b is provided between the bracket 4 provided outside the bracket 4' closest to the gear box G and the bracket 4' closest to the gear box G. The lengths (thicknesses) of the bracket cover 3 and the bracket cover 3b in the length direction of the rotation shaft 7 are substantially the same, but the length (thickness) of the bracket cover 3a in the length direction of the rotation shaft 7 is approximately three times the lengths (thicknesses) of the bracket cover 3 and the bracket cover 3b in the length direction of the rotation shaft 7. According to such a configuration, the intervals between the claws 2 in the length direction of the rotation shaft 7 are substantially the same. Therefore, there is no bias in the external force applied to the crushed stones from the claws 2, and the crushed stones can be efficiently moved. The bracket cover 3 and the bracket cover 3b may be the same member.

[0030] The claws 2 are installed in the grooves g provided in the brackets 4 and 4', and while covering the brackets 4 and 4' in which the claws 2 are installed, they are clamped and fixed by the bracket covers 3, 3a adjacent to the brackets 4, 4' in the length direction of the rotation shaft 7 and the brackets 4, 4'. Specifically, as shown in FIG. 4, a fastening member 8 (a countersunk head bolt) is inserted into the inner circumference of the rotating shaft 7 from a tapered hole t of a bracket lid 3 provided on the side of the bracket 4 farthest from the gear box G, and is screwed into a thread groove of an internal thread formed on the inner circumferential surface of the rotating shaft 7, thereby fastening the adjacent brackets 4' and 4, and the bracket lids 3, 3a, and 3b in the length direction of the rotating shaft 7 and firmly fixing them to the rotating shaft 7. Here, the diameter of the rotating shaft 7 on the inner side (the side closer to the gear box G) of the bracket lid 3 is formed larger than the diameter of a hole h provided in the bracket lid 3 so that the bracket lid 3 closest to the gear box G cannot move further inward (the side closer to the gear box G). Since it is configured in this way, by loosening the fastening member 8 and pulling it out from the rotating shaft 7, the brackets 4' and 4, the claws 2, and the bracket lids 3, 3a, and 3b can be removed from the rotating shaft 7. In this way, the claws 2, the brackets 4' and 4, and the bracket lids 3, 3a, and 3b are detachably provided on the rotating shaft 7.

[0031] As shown in FIG. 5, the claw 2 is installed 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 member 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 with a diameter of about 5 mm and a substantially circular cross-section.

[0032] As shown in FIGS. 5 and 8, the claw 2 includes a proximal end extension 21 extending in the radial direction of the central axis O or the rotating shaft 7 from both ends of a base portion 2B substantially orthogonal to the central axis O or the rotating shaft 7, an intermediate extension 22 extending from the outer end portion in the radial direction of the proximal end extension 21 at an angle of 90° or less with respect to the proximal end extension 21 in the direction opposite to the rotation direction of the rotating shaft 7, and a distal end portion 23 extending from the outer end portion in the radial direction of the intermediate extension 22 at an angle in the range of 90° to 180° with respect to the intermediate extension 22 in the radial direction outside the central axis O or the rotating shaft 7. The length of the intermediate extension 22 is, for example, about 85 mm.

[0033] The base 2B of the claw 2 is installed at the base g1 of the groove g, and the proximal extension 21 of the claw 2 is installed 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 claw units. That is, as shown in FIG. 1, the claw unit is composed of a plurality of claws 2 that are symmetrically arranged about the rotation axis 7 at positions substantially equal in the length direction of the rotation axis 7.

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

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

[0037] According to such a configuration, when the claw 2 abuts against the crushed stone, due to the elasticity of the claw 2, the claw 2 bends, and thus an appropriate external force can be applied to the crushed stone. Furthermore, since the above-described gap is provided between the claw 2 and the groove g, in addition to the bending due to the elasticity of the claw 2 itself, when the claw 2 abuts against the crushed stone, the claw 2 can escape in the direction opposite to the direction in which the claw 2 rotates with respect to the crushed stone by the amount of movement of the claw 2 between the gap. More specifically, when the claw 2 abuts against the crushed stone, in the direction opposite to the direction in which the claw 2 rotates with respect to the crushed stone, the claw 2 can escape within the range until the proximal end extension 21 of the claw 2 abuts against the inner peripheral surface of the extension g2 or extension g3 of the groove g around the boundary between the base 2B of the claw 2 and the proximal end extension 21. Therefore, a more appropriate external force can be applied to the crushed stone. The crushed stones have the property that when a strong force is applied, the crushed stones are firmly fixed to each other. That is, when a weight is applied to the crushed stones from a vehicle traveling on the rail via the rail and the sleeper, the crushed stones are firmly connected to each other and stably support the sleeper. Therefore, when moving the crushed stones, it is inappropriate to apply a force that is too strong as it will induce a strong connection between the crushed stones, and it is necessary to apply an appropriate external force that is not too strong. According to the crushed stone arranging device E of the present embodiment, an appropriate external force can be applied to the crushed stones. Therefore, it is suitable for use in small-scale crushed stone removal work and spreading work that can be flexibly carried out by a small number of people. Also, according to the shape of the claw 2 of the crushed stone arranging device E of the present embodiment, the tip 23 of the claw 2 abuts against the crushed stone so as to lift the crushed stone from below or stroke the upper part of the crushed stone. By abutting the tip 23 against the crushed stone from such a direction, an external force suitable for the movement of 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 the radially outer end of the intermediate extension portion 22 so as to form an angle in the range of 90° to 180° (hereinafter referred to as angle A) with respect to the central axis O or the radially outer side of the rotation axis 7. Therefore, when the tip portion 23 of the claw 2 comes into contact with the crushed stone, according to the law of action and reaction, when the tip portion 23 of the claw 2 applies an external force F to the crushed stone, 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 so as to form an angle in the range of 90° to 180° with respect to the central axis O or the radially outer side of the rotation axis 7, among the external force F applied from the crushed stone to the tip portion 23 of the claw 2, the component force that contributes to the moment of the force for rotating the intermediate extension portion 22 about the boundary between the intermediate extension portion 22 and the base extension portion 21 as the rotation center becomes smaller than the external force F. That is, in a virtual right triangle (not shown) having a side orthogonal to the intermediate extension portion 22 and a side parallel to the intermediate extension portion 22 with the tip portion 23 as the long side, among the external force F corresponding to the length of the tip portion 23, the component force that contributes to the moment of the force is decomposed into the length of the side orthogonal to the intermediate extension portion 22, so that the load applied to the claw 2 can be reduced. The angle A is preferably in the range of 90° to 180° as described above, more preferably in the range of 105° to 160°, and even more preferably in the range of 120° to 135°. Also, the intermediate extension portion 22 extends from the radially outer end of the base extension portion 21 at an angle of 90° or less (hereinafter referred to as angle B) in the direction opposite to the rotation direction of the rotation axis 7. Therefore, the moment of the force for rotating the intermediate extension portion 22 acts in the direction of reducing the angle formed by the radially inner end of the intermediate extension portion 22 and the radially outer end of the base extension portion 21. The elasticity of the claw 2 appropriately receives the deformation caused by the rotation of the intermediate extension portion 22 and appropriately pushes it back, so that as a result, an external force suitable for the movement of the crushed stone can be applied to the crushed stone. The angle B is preferably an angle of 90° or less as described above, more preferably an angle smaller than 85°, and even more preferably an angle smaller than 80°. Here, as shown in FIG. 5, at the boundary between the base portion 2B and the base extension portion 21 of the claw 2, the boundary between the base extension portion 21 and the intermediate extension portion 22, and the boundary between the intermediate extension portion 22 and the tip portion 23, a rounded shape may be provided so that stress does not concentrate at these boundaries.

[0039] <Second Embodiment> Hereinafter, the crushed stone sorting tool E' according to the second embodiment of the present invention will be described with reference to the drawings. The same structural elements as those of the crushed stone sorting tool E in the first embodiment are denoted by common reference numerals, and the description thereof is omitted. Only the differences from the first embodiment will be described.

[0040] FIG. 9 is a front sectional view of the crushed stone sorting tool E' according to the second embodiment of the present invention. In the crushed stone sorting tool E of the first embodiment, the rotating shaft 7 extends substantially perpendicular to the length direction of the gripping portion 1, whereas the crushed stone sorting tool E' of the second embodiment is different in that the rotating shaft 9 is provided substantially parallel to the direction in which the gripping portion 1' extends.

[0041] More specifically, the driving means M is provided on the tip side of the gripping portion 1' (the lower side in FIG. 9, that is, the side close to the claw 2). The bevel gear UG1 provided on the tip side of the driving means M (the lower side in FIG. 9, that is, the side close to the claw 2) rotates about the length direction (central axis) L1 of the gripping portion 1'. The bevel gear BG that rotates about the central axis L2 substantially parallel to the length direction L1 of the gripping portion and is housed in the gear box G' 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 the rotating shaft 9 that rotates about the central axis L3 for rotating the claw 2. With such a 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 about the central axis L3.

[0042] In the example of FIG. 9, a bracket 4' and a bracket 4 and two bracket covers 3 are provided on the rotating shaft 9, and three claw units are clamped therebetween. The clamping method is the same as that in the first embodiment, in which a fastening member 8 inserted into the inner peripheral surface of the cylindrical rotating shaft 9 from the outside of the bracket cover 3 provided on the side farthest from the gripping portion 1' (the lower side in FIG. 9, that is, the side close to the crushed stones) is screwed into a thread groove formed on the inner peripheral surface of the rotating shaft 9. Here, in the example of FIG. 9, the bracket 4' closest to the gear box G has grooves g provided 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 side farther from the gear box G than itself. Also, in the example of FIG. 9, as shown in FIG. 11, an intermediate extension 22 extends from the radially outer end of the proximal extension 21 at an angle of approximately 90° to the proximal extension 21 in a direction opposite to the rotation direction of the rotating shaft 9, and a distal end portion 23 extends from the radially outer end of the intermediate extension 22 so as to form an angle of approximately 90° with the intermediate extension 22 radially outside the central axis O or the rotating shaft 9.

[0043] Also, as shown in FIG. 10, which is a view of the crushed stone sorting tool E' seen from the left side of FIG. 9, the central axes L2 and L3 may intersect with respect to the central axis L1.

[0044] According to such a crushed stone sorting tool E' of the second embodiment, the rotating surface formed by the rotating claws 2 is substantially parallel to the horizontal plane (the ground). For example, the crushed stone sorting tool E' of the second embodiment is inserted into the hole of the crushed stones formed by excavating the crushed stones between the sleepers using the crushed stone sorting tool E of the first embodiment, and the crushed stones can be further excavated in a direction substantially perpendicular to the hole (substantially parallel to the ground). By doing so, the crushed stones mainly under the sleepers can be scraped out.

[0045] According to the configuration of the crushed stone arranging tool E' of the second embodiment as described above, the same effects as those of the crushed stone arranging tool E of the first embodiment can be achieved. That is, when the claw 2 abuts against the crushed stone, due to the elasticity of the claw 2, the claw 2 bends, and thus an appropriate external force can be applied to the crushed stone. Further, since a gap is provided between the claw 2 and the groove g, in addition to the bending of the claw 2 due to its own elasticity, the claw 2 moves with respect to the gap. Therefore, when the claw 2 abuts against the crushed stone, the claw 2 can escape in the direction opposite to the direction in which the claw 2 rotates with respect to the crushed stone. More specifically, when the claw 2 abuts against the crushed stone, in the direction opposite to the direction in which the claw 2 rotates with respect to the crushed stone, the claw 2 can escape within the range until the proximal end extension 21 of the claw 2 abuts against the inner peripheral surface of the extension g2 or extension g3 of the groove g around the boundary between the base 2B of the claw 2 and the proximal end extension 21. Therefore, a more appropriate external force can be applied to the crushed stone. Crushed stones have the property that when a strong force is applied, the crushed stones are firmly fixed to each other. That is, when weight is applied to the crushed stones from a vehicle traveling on the rail via the rail and the sleeper, the crushed stones are firmly connected to each other and stably support the sleeper. Therefore, when moving the crushed stones, it is inappropriate to apply a force that is too strong as it will induce a strong connection between the crushed stones, and it is necessary to apply an appropriate external force that is not too strong. According to the crushed stone arranging tool E' of the present embodiment, an appropriate external force can be applied to the crushed stones. Therefore, it is suitable for use in small-scale crushed stone removal work and spreading work that can be flexibly carried out by a small number of people. Also, according to the shape of the claw 2 of the crushed stone arranging tool E' of the present embodiment, the tip 23 of the claw 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 abutting the tip 23 against the crushed stone from such a direction, an external force suitable for the movement of the crushed stone can be applied to the crushed stone.

[0046] As described above, the first embodiment and the second embodiment of the present invention have been described with reference to the drawings, but the present invention is not limited to the above embodiments. The various shapes and combinations of the respective constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

[0047] For example, one claw 2 may be provided on one bracket 4, or a plurality of 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 claw unit or the bracket 4 provided with the claw 2 is not limited to the case where three brackets 4 are stacked on one side (the front side and the back side in FIG. 1 respectively) of the gear box G with the gear box G as the center. Only one bracket 4 may be provided, or any number of two or more brackets 4 may be stacked. The length of the rotating shaft 7 may be extended according to the number of brackets 4 to be stacked. The fastening member 8 is not limited to a countersunk head bolt, and any known bolt capable of fastening the bracket 4 and the bracket lid 3 may be used. Although the claw 2 is formed of spring steel having a substantially circular cross-section with a diameter of about 6 mm, it is not limited thereto, and it may be formed of spring steel having a substantially circular cross-section with a diameter of about 5 mm. In the example of FIG. 9, it is assumed that the bracket 4' closest to the gear box G is provided with grooves g on both the bottom surfaces A and B on both sides. However, the bracket closest to the gear box G may be a bracket 4 provided with a groove g only on one bottom surface A. The material of the bracket 4 may be resin or a metal such as aluminum, for example. In the above description, there are descriptions such as substantially orthogonal, about 6 mm, or about 5 mm. This is to clarify that it is not necessary to be exactly orthogonal, nor is it necessary to be exactly 6 mm. Substantially orthogonal means, for example, including from a right angle to about ±2 to 3°, and about 6 mm and about 5 mm may include up to about ±0.25 mm. Also, although the length of the intermediate extension 22 is described as about 85 mm, for example, it is not limited to this example and may be set as appropriate.

Explanation of Reference Numerals

[0048] 1 Gripping portion 2 Claw 3, 3a, 3b Bracket lid 4, 4' Bracket 7, 9 Rotating shaft 8 Fastening member E, E' crushed stone finishing tool G gear box O central axis

Claims

1. a claw that can rotate in accordance with the rotation of the rotating shaft; A driving means for rotating the rotating shaft; a gear box that houses the driving means and rotatably holds the rotary shaft; a gripping portion coupled to the gear box, A stone crushing tool characterized in that the claws are made of metal and have elasticity.

2. The stone processing tool described in claim 1, characterized in that a plurality of 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.

3. The stone sorting tool described in claim 2, characterized in that the multiple claws are removably attached to the rotating shaft and are 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.

4. The stone processing tool described in claim 3, characterized in that each of the multiple claws comprises a base extension extending radially from both ends of a base that is approximately perpendicular to the rotation shaft, an intermediate extension extending from the radial outer end of the base extension in a direction opposite to the rotation direction of the rotation 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 rotation shaft in the rotation direction of the rotation shaft at an angle in the range of 90° to 180° with the intermediate extension.

5. The stone sorting tool described in claim 4, 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.

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