Under-sleeper bolt fixing jig

Abstract

To provide an under-sleeper bolt fixing jig used as a claw bolt adaptable to various sleepers different in thickness.SOLUTION: A substantially rectangular parallelepiped under-sleeper bolt fixing jig 20 has a first locking part 29 separated from a first surface part 27 by a first interval 41 and a second locking part separated from a second surface part, which is a rear surface, by a second interval, on the inner surface of a vertical insertion hole 25. Since the length of the first interval 41 is different from that of the second interval, the jig changes into a first posture or a second posture by inverting the top and bottom, and can be used appropriately according to the thickness of a sleeper 1.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a sleeper bolt fixing jig used for fixing a point device or the like to a sleeper placed under the rail of a railway vehicle. [Background technology]

[0002] As an example of a point device that serves as a point section of a turnout that selects the route of railway vehicles, there is a point device described in the following Non-Patent Document 1 (see Fig. 1). This point device is composed of a switching device and a locking device, and is operated by an electric point machine 101. Here, the switching device brings a tongue rail 103 into or out of contact with a fixed base rail 102, while the locking device maintains the tongue rail 103 and base rail 102 in a tightly contacted state.

[0003] In general, an electric point machine 101 is installed on a sleeper 100 extending on the outer side of the gauge (outside between a pair of base rails 102) and fixed to the sleeper 100 by a claw bolt (not shown). For example, as described in the following Patent Document 1, the claw bolt penetrates the sole plate laid on the sleeper and the electric point machine from the underside of the sleeper, and a nut is fastened on the upper surface of the sleeper. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-55483 [Non-patent literature]

[0005] [Non-Patent Document 1] June 28, 2005, published by the Japan Railway Electrical Engineering Association, "Introduction to Electricity for Railway Engineers, Signal Series 4, Point Equipment", 7th printing, No. 1, pp. 38-47 Summary of the Invention [Problem to be solved by the invention]

[0006] In recent years, instead of wooden sleepers, elastic sleepers covered with an elastic layer such as non-foamed urethane are increasingly being used. Elastic sleepers are thicker than conventional sleepers, so claw bolts of a length that matches the thickness of conventional sleepers are not suitable. That is, when a claw bolt penetrates a sleeper from its underside, its upper end is exposed on the upper surface of the sleeper, but if the sleeper is thick, the protrusion of the claw bolt is insufficient and it cannot be fastened with a nut. Therefore, claw bolts of a length that matches elastic sleepers are required. At construction sites, the type of sleeper is rarely communicated to workers, and if a claw bolt that matches the type of sleeper is not prepared, construction is halted and inefficient.

[0007] The present invention has been proposed in view of the above-mentioned circumstances, and has an object to provide a sleeper bolt fixing jig used as a claw bolt that can be adapted to various sleepers having different thicknesses. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides a sleeper under-use bolt fixing jig that is attached to the tip of a bolt that penetrates a fixed fixture and the sleeper in order to fix a fixed fixture to a sleeper that is laid under the rails of a railway vehicle, and is characterized in that the jig has an insertion hole through which the bolt is passed, a first locking portion that is formed in the insertion hole at a position spaced a first distance from a first surface portion that is one side of the opening surface of the insertion hole toward a second surface portion that is the other side of the opening surface of the insertion hole, and a second locking portion that is formed in the insertion hole at a position spaced a second distance different from the first distance from the second surface portion toward the first surface portion, and is capable of being used selectively by being flipped between a first position in which the locked portion formed at the tip of the bolt locks with the first locking portion and the first surface portion faces the underside of the sleeper, and a second position in which the locked portion locks with the second locking portion and the second surface portion faces the underside of the sleeper.

[0009] The sleeper bolt fixing jig of the present invention is characterized in that it has a locking protrusion that protrudes inward from an axially offset position on the inner surface of the insertion hole from the axial center of the insertion hole, and the surface of the locking protrusion that faces the same direction as the first surface portion is the second locking portion, and the surface of the locking protrusion that faces the same direction as the second surface portion is the first locking portion.

[0010] The sleeper bolt fixing jig of the present invention is characterized in that it has a passage portion leading from a side portion, which is a lateral surface perpendicular to the axial direction of the insertion hole, to the insertion hole, and the engaged portion is passed through the passage portion.

[0011] The sleeper bolt fixing jig according to the present invention comprises a first claw portion formed on the first surface portion, and a second claw portion formed on the second surface portion, wherein in the first position, the first claw portion is hooked onto the underside of the sleeper, and in the second position, the second claw portion is hooked onto the underside of the sleeper.

[0012] The sleeper under bolt fixing jig of the present invention is characterized in that it has a passage protrusion protruding inward from the inner surface of the passage portion and connected to the locking protrusion, a second passage surface portion of the passage protrusion which is a surface facing the same direction as the first surface portion is connected to the second locking portion and the second locking portion is recessed into the second passage surface portion, and a first passage surface portion of the passage protrusion which is a surface facing the same direction as the second surface portion is connected to the first locking portion and the first locking portion is recessed into the first passage surface portion.

[0013] The sleeper bolt fixing jig according to the present invention is characterized in that a recess is formed in the side surface portion.

[0014] The sleeper bolt fixing jig according to the present invention is characterized in that the first locking portion and the second locking portion are female threads that screw into the locked portion, which is a male thread. Effect of the Invention

[0015] The sleeper bolt fixing jig of the present invention is attached to the tip of a bolt that passes through a fixture and a sleeper in order to fix the fixture to a sleeper that is placed under the rails of a railway vehicle. The jig has an insertion hole through which the bolt passes, a first locking portion formed in the insertion hole at a position a first distance away from a first surface portion that is one side of the opening surface of the insertion hole toward a second surface portion that is the other side of the opening surface of the insertion hole, and a second locking portion formed in the insertion hole at a position a second distance different from the first distance from the second surface portion toward the first surface portion. The jig can be used by flipping between a first position in which the locked portion formed at the tip of the bolt locks with the first locking portion and the first surface portion faces the underside of the sleeper, and a second position in which the locked portion locks with the second locking portion and the second surface portion faces the underside of the sleeper. That is, in the first position, the locked portion of the bolt is locked by the sleeper under-bolt fixing jig at a position a first distance away from the underside of the sleeper (or from a first surface portion facing this underside), while in the second position, the locked portion is locked by the sleeper under-bolt fixing jig at a position a second distance away from the underside of the sleeper (or from a second surface portion facing this underside). Since the first and second distances are different lengths, the degree to which the bolt protrudes from the upper surface side of the sleeper changes in each position, even for the same bolt. This makes it possible to adapt to various sleepers of different thicknesses. Also, since the position can be changed by inverting the sleeper, the operation is simple.

[0016] The sleeper bolt fixing jig according to the present invention has a locking protrusion that protrudes inward from a position on the inner surface of the insertion hole that is axially shifted from the axial center of the insertion hole, and the surface of the locking protrusion that faces the same direction as the first surface is the second locking portion, and the surface of the locking protrusion that faces the same direction as the second surface is the first locking portion. In other words, the locking protrusion serves as both the first locking portion and the second locking portion, making the configuration simple.

[0017] The bolt fixing jig for use under a sleeper according to the present invention has a passage portion that leads from a side surface, which is a lateral surface perpendicular to the axial direction of the insertion hole, to the insertion hole, and the locked portion is passed through the passage portion. Therefore, the bolt fixing jig for use under a sleeper can be attached and detached from the side of the bolt. For example, a worker holds the bolt fixing jig for use under a sleeper and inserts his / her hand under the sleeper, places the passage portion on the side of the locked portion of the bolt, and inserts the locked portion into the insertion hole. This simplifies the work. If there is no passage portion, it is necessary to insert the bolt into the insertion hole and then pass the bolt through from the underside of the sleeper, so that a hole equivalent to the length of the bolt must be drilled under the sleeper.

[0018] The fixing jig for bolts under a sleeper according to the present invention has a first claw portion formed on a first surface portion and a second claw portion formed on a second surface portion, and in the first position, the first claw portion is hooked onto the underside of the sleeper, and in the second position, the second claw portion is hooked onto the underside of the sleeper. Each claw portion bites into the underside of the sleeper, thereby firmly fixing the fixing jig for bolts under a sleeper to the sleeper.

[0019] The bolt fixing jig for use under a sleeper according to the present invention has a passage protrusion that protrudes inward from the inner surface of the passage portion and is connected to the locking protrusion, and a second passage surface portion of the passage protrusion that faces the same direction as the first surface portion is connected to the second locking portion, and the second locking portion is recessed into the second passage surface portion, and a first passage surface portion of the passage protrusion that faces the same direction as the second surface portion is connected to the first locking portion, and the first locking portion is recessed into the first passage surface portion. The locked portion of the bolt is disposed in the insertion hole through the passage protrusion and engages with the first locking portion or the second locking portion. The first locking portion is recessed into the first passage surface portion, forming a step, and the locked portion engaged with the first locking portion, which is the lower step, does not come out of the passage portion. Similarly, the second locking portion is recessed into the second passage surface portion, forming a step, and the locked portion engaged with the second locking portion, which is the lower step, does not come out of the passage portion. Therefore, the fit between the under-slung bolt fixing jig and the bolt is robust.

[0020] The sleeper bolt fixing jig according to the present invention has a recess formed on the side surface. Therefore, an operator can hold the sleeper bolt fixing jig by placing his / her fingers against the recess, which simplifies the work. In particular, when the first surface portion is formed with a first claw portion and the second surface portion is formed with a second claw portion, an operator may be injured by the claw portion regardless of which surface he / she grips, but if the operator can grip the recess, there is no risk of injury.

[0021] In the sleeper bolt fixing jig according to the present invention, the first locking portion and the second locking portion are female threads that screw into the locked portion, which is a male thread, and therefore can be adapted to a male-thread type bolt. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a schematic plan view showing an outline of a conventional point equipment installation state. [Diagram 2] FIG. 2 is a schematic explanatory diagram of a claw bolt using a fixing jig for a bolt under a sleeper according to the first embodiment of the present invention. [Diagram 3] FIG. 3 is a top view of the sleeper under bolt fixing jig according to the first embodiment of the present invention in a first position. [Figure 4] FIG. 4 is a front see-through view of the sleeper bolt fixing jig according to the first embodiment of the present invention in a first position. [Diagram 5] FIG. 5 is a front see-through view of the sleeper bolt fixing jig according to the first embodiment of the present invention in a second position. [Figure 6] FIG. 6 is a bottom view of the sleeper bottom bolt fixing jig in the first position according to the first embodiment of the present invention. [Figure 7] FIG. 7 is a cross-sectional view showing a state in which a claw bolt is used with the sleeper under-bolt fixing jig in the first position according to the first embodiment of the present invention. [Figure 8] FIG. 8 is a cross-sectional view showing a state in which a claw bolt is used with the sleeper under-bolt fixing jig in the second position according to the first embodiment of the present invention. [Figure 9] FIG. 9 is a schematic explanatory diagram of a claw bolt using a fixing jig for a bolt under a sleeper according to a second embodiment of the present invention. [Figure 10] FIG. 10 is a top view of a sleeper under-bolt fixing jig according to a second embodiment of the present invention in a first position. [Figure 11] FIG. 11 is a front see-through view of a sleeper bolt fixing jig according to a second embodiment of the present invention in a first position. [Figure 12] FIG. 12 is a front see-through view of a sleeper under bolt fixing jig according to a second embodiment of the present invention in a second position. [Figure 13] FIG. 13 is a bottom view of a sleeper under-bolt fixing jig in a first position according to the second embodiment of the present invention. [Figure 14] FIG. 14 is a schematic explanatory diagram of a claw bolt using a fixing jig for a bolt under a sleeper according to a third embodiment of the present invention. [Figure 15] FIG. 15 is a top view of a sleeper under-bolt fixing jig in a first position according to a third embodiment of the present invention. [Figure 16] FIG. 16 is a front see-through view of a sleeper bolt fixing jig according to a third embodiment of the present invention in a first position. [Figure 17] FIG. 17 is a front see-through view of a sleeper bolt fixing jig according to a third embodiment of the present invention in a second position. [Figure 18] FIG. 18 is a bottom view of a sleeper bottom bolt fixing jig in a first position according to the third embodiment of the present invention. [Figure 19] FIG. 19 is a plan view of a sleeper bolt fixing jig according to a fourth embodiment of the present invention. [Figure 20] FIG. 20 is a side view of a sleeper bolt fixing jig according to a fourth embodiment of the present invention. [Figure 21] FIG. 21 is a plan view of a sleeper under bolt fixing jig according to the fifth embodiment of the present invention. [Figure 22] FIG. 22 is a partial side view of a sleeper bolt fixing jig according to the fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The bolt fixing jig for under the sleeper according to the embodiment of the present invention is attached to the tip of a bolt that penetrates a fixed device and a sleeper in order to fix the fixed device, such as a point device, to a sleeper that is laid under the rail of a railway vehicle. The bolt fixing jig for under the sleeper is used as a claw bolt together with a bolt. The fixed device includes, for example, a floor plate, an electric point machine, a point sign, a locking device, a switch with a sign, a spring point machine, an escape crank, a signal rebar, a rod carrier, etc. The sleeper includes various types of sleepers with different thicknesses, such as wooden sleepers and elastic sleepers.

[0024] Hereinafter, the fixing jig for a bolt used under a sleeper according to this embodiment will be described with reference to the drawings. Fig. 2 shows a claw bolt 6 using a fixing jig 20 for a bolt used under a sleeper according to a first embodiment.

[0025] As shown in FIG. 2, the claw bolt 6 is composed of a bolt 7 and a sleeper bolt fixing jig 20. The bolt 7 has a rod-shaped axial center portion 8, a pressed portion 9 formed at the upper end of the axial center portion 8, and an engaged portion 12 formed at the lower end of the axial center portion 8. The axial center portion 8 is cylindrical, and a thread groove is formed at an upper portion 11. A nut 5 (see FIG. 7) is fastened to the upper portion 11. The pressed portion 9 has a pair of flat surfaces 10 on its side. The pressed portion 9 is held by a tool (not shown) such as a spanner or wrench. The engaged portion 12 has a neck portion 13 narrower in width than the axial center portion 8, and a head portion 14 of the same diameter as the axial center portion 8 and connected to the neck portion 13. The neck portion 13 is formed by a so-called H cut or double D cut, and a part of the outer surface is recessed from the axial center portion 8 and the head portion 14. Therefore, a step 15 is formed at the boundary between the neck 13 and the head 14. A bolt fixing jig 20 for use under the sleeper is hooked onto the step 15. The bolt fixing jig 20 for use under the sleeper is substantially rectangular, and has an insertion hole 25 through which the bolt 7 is passed formed in the center.

[0026] Here, the sleeper under-bolt fixing jig 20 will be described with reference to the drawings. Figures 3 to 6 show the entire sleeper under-bolt fixing jig 20.

[0027] 3 to 6, the sleeper under-bolt fixing jig 20 has an insertion hole 25 extending vertically, a pair of locking projections 26 formed on the inner surface of the insertion hole 25, a first surface 27 which is the upper opening surface where the insertion hole 25 is formed, and a second surface 28 which is the lower opening surface, four side surface portions 21 which are outer surfaces on the sides perpendicular to the axial direction of the insertion hole 25, a passage portion 31 which leads from a front surface portion 22 which is one of the side surface portions 21 to the insertion hole 25, a pair of passage projections 32 formed on the inner surface of the passage portion 31, and a recessed portion 38 formed on the right surface portion 23 and the left surface portion 24 which are a pair of side surface portions 21 connected perpendicularly to the front surface portion 22. The locking projections 26 and the passage projections 32 are connected.

[0028] First claws 39 are formed at the four corners of the first surface portion 27, and second claws 40 are formed at the four corners of the second surface portion 28. The first claws 39 and the second claws 40 are substantially conical protrusions that protrude upward or downward, respectively. The recesses 38 are formed by the left and right surface portions 23, 24 being recessed inward, and extend in the front-rear direction.

[0029] The passage portion 31 forms a vertically extending space from the front portion 22 to the insertion hole 25. The passage protrusions 32 formed in the passage portion 31 protrude inward from the inner surface of the passage portion 31 and extend to the insertion hole 25. The passage protrusions 32 are formed at positions shifted toward the second surface portion 28 from the center of the insertion hole 25 in the axial direction. Of the passage protrusions 32, the surface facing the same direction as the first surface portion 27 is the second passage surface portion 34, and the surface facing the same direction as the second surface portion 28 is the first passage surface portion 33. The first passage surface portion 33 is on the same plane as the second surface portion 28.

[0030] Since the passage protrusion 32 is formed, the passage portion 31 has a different width between the first surface portion 27 side and the second surface portion 28 side. That is, the passage portion 31 has a first passage portion 35 connected to the first surface portion 27 and a second passage portion 36 connected to the second surface portion 28 (see FIG. 4). Since the second passage portion 36 is narrowed by the passage protrusion 32, the width of the second passage portion 36 is narrower than the width of the first passage portion 35 (in other words, the width of the first passage portion 35 is wider than the width of the second passage portion 36). The width of the first passage portion 35 is a width through which the head portion 14 of the bolt 7 passes, and the width of the second passage portion 36 is a width through which the neck portion 13 of the bolt 7 passes.

[0031] The locking protrusions 26 protrude inward from the inner surface of the insertion hole 25, which is the inside of the left and right surface portions 23, 24, and are connected to the passage protrusions 32. The locking protrusions 26 are formed at positions shifted toward the second surface portion 28 from the center in the axial direction of the insertion hole 25. Of the locking protrusions 26 in the insertion hole 25, the surface facing the same direction as the first surface portion 27 is the second locking portion 30, and the surface facing the same direction as the second surface portion 28 is the first locking portion 29. The second locking portion 30 is connected to the second passage surface portion 34, and the second locking portion 30 is recessed in the axial direction of the insertion hole 25 relative to the second passage surface portion 34 (downward in FIG. 4). The first locking portion 29 is connected to the first passage surface portion 33, and the first locking portion 29 is recessed in the axial direction of the insertion hole 25 relative to the first passage surface portion 33 (downward in FIG. 5). The first locking portion 29 and the second locking portion 30 are disk-shaped and sized to fit the head 14 of the bolt 7 therein.

[0032] The first locking portion 29 is formed at a position spaced apart by a first interval 41 from the first surface portion 27 toward the second surface portion 28. The second locking portion 30 is formed at a position spaced apart by a second interval 42 from the second surface portion 28 toward the first surface portion 27. The first interval 41 and the second interval 42 have different lengths, with the first interval 41 being longer than the second interval 42 (in other words, the second interval 42 being shorter than the first interval 41).

[0033] 4 and 5, the sleeper bolt fixing jig 20 can be turned upside down to change to a first position or a second position, and can be used appropriately. In the first position, the first surface 27 faces upward (see FIG. 4), and in the second position, the second surface 28 faces upward (see FIG. 5).

[0034] Next, a method of using the sleeper bolt fixing jig 20 will be described with reference to the drawings, together with its action and effect. Figures 7 and 8 show the use of the claw bolt 6 using the sleeper bolt fixing jig 20. Figure 7 shows the use when the sleeper bolt fixing jig 20 in the first position is used, and Figure 8 shows the use when the sleeper bolt fixing jig 20 in the second position is used.

[0035] As shown in Fig. 7, a bottom plate 2 is laid on a sleeper 1, and a fixing device 3 is placed on the bottom plate 2. A hole is formed in each of the sleeper 1, the bottom plate 2, and the fixing device 3 (hereinafter, the holes are collectively referred to as "holes"), and the holes 4 are aligned on the same axis. A bolt 7 is passed through the hole 4, and the bolt 7 is oriented such that the pressed part 9 faces upward and the locked part 12 faces downward. With the locked part 12 protruding from the underside of the sleeper 1, the sleeper under-bolt fixing jig 20 is attached to the locked part 12 in the first position. In more detail, the worker holds the sleeper under-bolt fixing jig 20 between, for example, the index finger and middle finger, or the index finger and ring finger, in the recessed part 38 (not shown in Fig. 7), and places his / her arm below the sleeper 1. The sleeper under-use bolt fixing jig 20 is placed against the locked part 12, which is passed through the passage portion 31 and placed in the insertion hole 25. At this time, the neck portion 13 of the locked part 12 is passed through the passage portion 31, and the head portion 14 of the locked part 12 is passed through the outside of the first passage surface portion 33. The bolt 7 is pulled from above the sleeper 1, or the sleeper under-use bolt fixing jig 20 is pressed downward relative to the bolt 7, so that the head portion 14 is locked and fitted into the first locking portion 29. The first surface portion 27 faces the underside of the sleeper 1, and the first claw portion 39 bites into and hooks onto the sleeper 1. A nut 5 is attached to the upper part 11 of the bolt 7, and the nut 5 is tightened while the pressed part 9 is gripped with a tool, so that the fixed fixture 3, the sole plate 2 and the sleeper 1 are sandwiched between the nut 5 and the sleeper under-bolt fixing jig 20.

[0036] 8, when the sleeper under-bolt fixing jig 20 is attached to the locked part 12 in the second position, when the locked part 12 is passed through the passage part 31 and placed in the insertion hole 25, the neck part 13 of the locked part 12 passes through the second passage part 36, and the head part 14 of the locked part 12 passes through the first passage part 35. The head part 14 is locked to and engages with the second locking part 30. The second surface part 28 faces the underside of the sleeper 1, and the second claw part 40 bites into and hooks onto the sleeper 1.

[0037] In the first position, the locked portion 12 of the bolt 7 is locked by the sleeper under-bolt fixing jig 20 at a position spaced a first distance 41 from the underside of the sleeper 1 (or from the first surface 27 facing the underside) (see FIG. 7). On the other hand, in the second position, the locked portion 12 of the bolt 7 is locked by the sleeper under-bolt fixing jig 20 at a position spaced a second distance 42 from the underside of the sleeper 1 (or from the second surface 28 facing the underside) (see FIG. 8). Since the first distance 41 is longer than the second distance 42, in the first position, the degree of protrusion of the upper portion 11 of the bolt 7 from the sleeper 1 is relatively small, whereas, since the second distance 42 is shorter than the first distance 41, in the second position, the degree of protrusion of the upper portion 11 of the bolt 7 from the sleeper 1 is relatively large. Therefore, the sleeper under bolt fixing jig 20 is used in the first position for sleepers 1 of normal thickness, and in the inverted second position for sleepers 1 with a certain thickness. Thus, the same bolt 7 can be used to fit various sleepers 1 of different thicknesses. Also, since the position can be changed by inverting it, the work is simple.

[0038] The worker can pinch the sleeper under-bolt fixing jig 20 by placing his / her fingers against the recessed portion 38 (see Fig. 4), which simplifies the work. In addition, since the passage portion 31 communicates with the insertion hole 25 (see Fig. 3), the bolt 7 can be attached from the side, which simplifies the work.

[0039] If an operator can grasp the recessed portion 38, the operator can work without touching the first surface portion 27 and the second surface portion 28, and therefore there is no risk of injury from the claw portions 39, 40.

[0040] The first locking portion 29 is recessed relative to the first passage surface portion 33 to form a step 37 (see Figures 5 and 6), so that the locked portion 12 of the bolt 7 engaged with the first locking portion 29 at the lower level will not slip out of the passage portion 31. Similarly, the second locking portion 30 is recessed relative to the second passage surface portion 34 to form a step 37 (see Figures 3 and 4), so that the locked portion 12 engaged with the second locking portion 30 at the lower level will not slip out of the passage portion 31. Therefore, the engagement between the sleeper under-bolt fixing jig 20 and the bolt 7 is robust.

[0041] Next, second to fifth embodiments of the present invention will be described with reference to the drawings. Figs. 9 to 13 show a claw bolt 206 using a bolt fixing jig 220 for use under the sleeper according to the second embodiment (the circle in the middle of Fig. 9 is a bottom view of the bolt 207). Figs. 14 to 18 show a claw bolt 306 using a bolt fixing jig 320 for use under the sleeper according to the third embodiment. Figs. 19 and 20 show a bolt fixing jig 420 for use under the sleeper according to the fourth embodiment. Figs. 21 and 22 show a bolt fixing jig 520 for use under the sleeper according to the fifth embodiment. In the following, configurations different from the bolt fixing jig 20 for use under the sleeper according to the first embodiment will be mainly described, and descriptions of configurations similar to the bolt fixing jig 20 for use under the sleeper will be omitted.

[0042] As shown in Fig. 9, in the second embodiment, the locked portion 212 of the bolt 207 has an elongated or elliptical base 243 having a diameter longer than the axial center portion 208, and an enlarged head 244 having a diameter larger than that of the base 243. The enlarged head 244 is hemispherical. As shown in Figs. 10 to 13, the sleeper under-bolt fixing jig 220 has an insertion hole 225 that opens upward and downward, an engagement protrusion 226 formed on the inner surface of the insertion hole 225, a first surface 227 which is the upper opening surface where the insertion hole 225 is formed, and a second surface 228 which is the lower opening surface.

[0043] The locking protrusion 226 is annular and protrudes inward from the inner peripheral surface of the insertion hole 225. The locking protrusion 226 is formed at a position shifted from the center of the insertion hole 225 in the axial direction toward the second surface portion 228. The locking protrusion 226 forms the insertion hole 225 into an elongated hole shape or an ellipse shape into which the base 243 of the bolt 207 fits. Of the locking protrusion 226 in the insertion hole 225, the surface facing the same direction as the first surface portion 227 is the second locking portion 230, and the surface facing the same direction as the second surface portion 228 is the first locking portion 229. The first locking portion 229 is on the same plane as the second surface portion 228.

[0044] Similar to the sleeper under bolt fixing jig 20, the first locking portion 229 is formed at a position spaced apart by a first interval 241 from the first surface 227 toward the second surface 228. The second locking portion 230 is formed at a position spaced apart by a second interval 242 from the second surface 228 toward the first surface 227. The first interval 241 and the second interval 242 have different lengths, and the first interval 241 is longer than the second interval 242 (in other words, the second interval 242 is shorter than the first interval 241). Similar to the sleeper under bolt fixing jig 20, the sleeper under bolt fixing jig 220 can also be turned upside down to be changed into a first position or a second position, and used appropriately.

[0045] The method of using the sleeper-under-use bolt fixing jig 220 differs from the method of using the sleeper-under-use bolt fixing jig 20 in that the sleeper-under-use bolt fixing jig 220 is attached to the bolt 207 in advance before the bolt 207 is passed through the hole 4 of the sleeper 1, etc. In detail, in the first position, the pressed portion 209 side of the bolt 207 is inserted into the insertion hole 225 from the second surface portion 228 side of the sleeper-under-use bolt fixing jig 220, the base portion 243 of the bolt 207 fits into the insertion hole 225, and the enlarged head portion 244 of the bolt 207 engages with the first engaging portion 229. In this state, the pressed portion 209 side is inserted into the hole 4 from below. In the second position, with the sleeper under-bolt fixing jig 220 inverted, the pressed portion 209 side is inserted into the insertion hole 225 from the first surface portion 227 side of the sleeper under-bolt fixing jig 220, the base 243 engages with the insertion hole 225, and the enlarged head 244 engages with and engages with the second engaging portion 230.

[0046] As shown in Fig. 14, in the third embodiment, the locked portion 312 of the bolt 307 is formed with a male thread 345. As shown in Figs. 15 to 18, the sleeper under-bolt fixing jig 320 has an insertion hole 325 that opens up and down, a first locking portion 329 and a second locking portion 330 formed on the inner surface of the insertion hole 325, a first surface portion 327 that is the upper opening surface where the insertion hole 325 is formed, and a second surface portion 328 that is the lower opening surface.

[0047] First locking portion 329 is a female thread 346 formed over a position spaced apart by first interval 341 from first surface portion 327 toward second surface portion 328. Second locking portion 330 is a female thread 346 formed over a position spaced apart by second interval 342 from second surface portion 328 toward first surface portion 327. No thread groove is formed in boundary portion 349 between first locking portion 329 and second locking portion 330, and therefore first locking portion 329 and second locking portion 330 are not connected to each other. Therefore, the insertion hole 325 is divided into a first insertion hole portion 347 in which a first locking portion 329 is formed and connected to the first surface portion 327, and a second insertion hole portion 348 in which a second locking portion 330 is formed and connected to the second surface portion 328. The bottom portion (boundary portion 349) of the first insertion hole portion 347 can also be called the first locking portion 329, and the bottom portion (boundary portion 349) of the second insertion hole portion 348 can also be called the second locking portion 330. The first interval 341 and the second interval 342 have different lengths, and the first interval 341 is longer than the second interval 342 (in other words, the second interval 342 is shorter than the first interval 341).

[0048] The method of using the under-sleeper bolt fixing jig 320 is generally the same as the method of using the under-sleeper bolt fixing jig 20. In the first position, the locked portion 312 of the bolt 307 is inserted into the first insertion hole 347 of the under-sleeper bolt fixing jig 320 with the bolt protruding from the underside of the sleeper 1, and is screwed into and locked with the female thread 346 (first locking portion 329). In the second position, the under-sleeper bolt fixing jig 320 is turned over, and the locked portion 312 is inserted into the second insertion hole 348 of the under-sleeper bolt fixing jig 320, and is screwed into and locked with the female thread 346 (second locking portion 330).

[0049] 19 and 20, the sleeper under bolt fixing jig 420 differs from the sleeper under bolt fixing jig 20 in the configuration of the first claw portion 439 and the second claw portion 440. The first claw portion 439 is formed at the four corners of the first surface portion 427, and the second claw portion 440 is formed at the four corners of the second surface portion 428. The first claw portion 439 and the second claw portion 440 are approximately triangular pyramid-shaped protrusions.

[0050] 21 and 22, the sleeper under bolt fixing jig 520 differs from the sleeper under bolt fixing jig 20 in the configuration of the first claw portion 539 and the second claw portion 540. The first claw portion 539 is formed at the four corners of the first surface portion 527, and the second claw portion 540 is formed at the four corners of the second surface portion 528. The first claw portion 539 and the second claw portion 540 are plate-like protrusions with turned-up corners.

[0051] In addition, in this other embodiment of the present invention, unlike the first embodiment, the first locking portion and the second locking portion are not recessed. Other embodiments do not have the recess. In other embodiments, the number, positions, and shapes of the protrusions of the first and second claw portions are arbitrary. Thus, in this embodiment, the number of the first and second claw portions is one to three, or five or more. The positions of the first claw portions are edges of the first surface portion, and the positions of the second claw portions are edges of the second surface portion. The shapes of the first and second claw portions are various protrusions that can be engaged with the sleeper. Another embodiment does not have the first claw portion and the second claw portion. In this embodiment, the first surface portion or the second surface portion is pressed against the underside of the sleeper, so that the sleeper or the like is sandwiched between the nut and the sleeper under-bolt fixing jig.

[0052] Although the embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and various design modifications can be made to the present invention without departing from the scope of the claims. [Explanation of symbols]

[0053] 1. Sleeper 2 bottom plate 3 Fixed equipment 4 holes 5 Nut 6,206,306 Claw bolt 7,207,307 Volts 8,208,308 Axis center 9,209,309 Pressed part 10,210,310 flat surface 11,211,311 Top 12,212,312 Locked part 13 Neck 14 Head 15 Step section 20,120,220,320,420,520 Bolt fixing jig for under-sleeper 21 Side part 22 Front 23 Right side 24 Left side 25,225,325 Through hole 26,226 Locking protrusion 27,227,327,427,527 First page part 28,228,328,428,528 Second surface part 29,229,329 First locking part 30,230,330 Second locking part 31 Passage section 32 Passage protrusion 33 First passage surface section 34 Second passage surface section 35 First passage section 36 Second passage section 37 Steps 38 Recess 39,239,339,439,539 First claw part 40,240,340,440,540 Second claw part 41,241,341 first interval 42,242,342 second interval 100 Sleepers 101 Electric switch 102 Basic Rail 103 Tongrail 243 Base 244 Enlarged Head 345 Male thread 346 Female thread 347 First insertion hole 348 Second insertion hole 349 Border

Claims

1. A sleeper under-bolt fixing jig that is attached to a tip of a bolt that penetrates a sleeper and a device to be fixed to the sleeper laid under a rail of a railway vehicle, the jig comprising: An insertion hole through which the bolt is passed; a first engaging portion formed in the insertion hole at a position spaced a first distance from a first surface portion, which is one of the opening surfaces of the insertion hole, toward a second surface portion, which is the other of the opening surfaces of the insertion hole; a second engaging portion formed in the insertion hole at a position spaced a second distance from the second surface portion toward the first surface portion by a second distance different from the first distance, The bolt can be used in a first position in which a locked portion formed at a tip end of the bolt is locked to the first locking portion and the first surface portion faces the bottom surface of the sleeper, and in a second position in which the locked portion is locked to the second locking portion and the second surface portion faces the bottom surface of the sleeper. A bolt fixing jig for use under sleepers.

2. a locking projection that projects inward from an inner surface of the insertion hole at a position that is shifted in the axial direction from a center of the insertion hole in the axial direction, Of the locking protrusion, a surface facing the same direction as the first surface portion is the second locking portion, Of the locking protrusion, a surface facing the same direction as the second surface portion is the first locking portion.

2. A bolt fixing jig for use under a sleeper according to claim 1.

3. a passage portion that communicates with the insertion hole from a side surface portion that is a side surface perpendicular to an axial direction of the insertion hole, and the locked portion is passed through the passage portion; 3. A bolt fixing jig for use under a sleeper according to claim 1 or 2.

4. A first claw portion formed on the first surface portion; A second claw portion formed on the second surface portion, In the first position, the first claw portion is hooked onto a lower surface of the sleeper, and in the second position, the second claw portion is hooked onto a lower surface of the sleeper.

3. A bolt fixing jig for use under a sleeper according to claim 1 or 2.

5. a passage protrusion protruding inward from an inner surface of the passage portion and connected to the locking protrusion, a second passage surface portion of the passage protrusion, which is a surface facing the same direction as the first surface portion, is connected to the second locking portion, and the second locking portion is recessed with respect to the second passage surface portion, A first passage surface portion of the passage protrusion, which is a surface facing the same direction as the second surface portion, is connected to the first locking portion, and the first locking portion is recessed with respect to the first passage surface portion. A bolt fixing jig for use under a sleeper according to claim 3 which is dependent on claim 2.

6. A recess is formed in the side surface.

5. A bolt fixing jig for use under a sleeper according to claim 4.

7. The first locking portion and the second locking portion are female threads that screw into the locked portion, which is a male thread.

2. A bolt fixing jig for use under a sleeper according to claim 1.

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