Screw insertion hole positioning jig and positioning method

Abstract

To provide a technology of a positioning tool capable of easily positioning a screw insertion hole, in work for boring the screw insertion hole in friction rubber of a handrail driving wheel of a passenger conveyor.SOLUTION: A handrail driving wheel of a passenger conveyor includes a plurality of inner diameter screw parts for screwing a friction rubber from an outer peripheral surface toward a radial inside. The positioning jig includes a cylindrical main body portion that is engaged with the inner diameter screw portion, a protruding portion that protrudes from an outer circumferential surface of the handrail driving wheel in a state in which the main body portion is engaged with the inner diameter screw portion, and an engagement portion with which a tool for engaging the main body portion with the inner diameter screw portion is engaged. The protrusion is configured to form a contact mark on the friction rubber when the friction rubber is brought into close contact with the outer peripheral surface in a state where the main body is engaged with the inner diameter screw portion.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a technology for a positioning jig that is suitable for positioning work when drilling screw insertion holes for attachment in friction rubber that is attached to handrail drive wheels of a passenger conveyor. [Background technology]

[0002] Patent Document 1 discloses technology related to a handrail drive device for a passenger conveyor, such as an escalator. This handrail drive device is provided with a handrail drive wheel that drives a handrail belt. The handrail drive wheel rotates when the driving force of a drive device that drives the steps is transmitted via a chain. The handrail belt is pressed against the handrail drive wheel, and frictional force is generated at the contact point between the handrail drive wheel and the handrail belt, driving the handrail belt. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-77556 Summary of the Invention [Problem to be solved by the invention]

[0004] The moving handrail is driven by being pressed against the handrail drive wheel. For this reason, some handrail drive wheels have friction rubber attached to their outer periphery to ensure friction between them and the moving handrail. The friction rubber wears out and needs to be replaced periodically. The friction rubber is fixed to the handrail drive wheel with multiple flat head screws, but new friction rubber does not have screw insertion holes that match the insertion positions of the flat head screws. For this reason, replacing the friction rubber requires the work of drilling screw insertion holes in the new friction rubber, but positioning the screw insertion holes is laborious, which is an issue.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide technology for a positioning jig that can easily position screw insertion holes when drilling screw insertion holes in the friction rubber of a handrail drive wheel of a passenger conveyor. [Means for solving the problem]

[0006] The positioning jig of the present disclosure is a positioning jig for screw insertion holes formed in friction rubber that is attached along the outer peripheral surface of a handrail drive wheel that wraps around and moves an endless moving handrail of a passenger conveyor in a circular motion, the handrail drive wheel having a plurality of internal threads for screwing the friction rubber through the screw insertion holes radially inward from the outer peripheral surface, and the positioning jig has a cylindrical main body that engages with the internal threads, a protrusion that protrudes from the outer peripheral surface when the main body is engaged with the internal threads, and an engagement portion that engages with a tool for engaging the main body with the internal threads, and is configured so that when the friction rubber is brought into close contact with the outer peripheral surface when the main body is engaged with the internal threads, the protrusion leaves a contact mark on the friction rubber.

[0007] In addition, the positioning method disclosed herein is a positioning method that uses the above-mentioned positioning jig to carve positioning marks for screw insertion holes into friction rubber, and includes the steps of engaging the main body of the positioning jig with each of the multiple inner diameter screw portions of the handrail drive wheel, adhering the friction rubber along the outer peripheral surface of the handrail drive wheel, and removing the friction rubber from the outer peripheral surface. [Effects of the Invention]

[0008] According to the technology of the present disclosure, when the friction rubber is brought into close contact with the outer circumferential surface of the handrail drive wheel with the main body of the positioning jig engaged with the inner diameter thread of the handrail drive wheel, the protrusion is configured to leave a contact mark on the friction rubber. With this configuration, the contact mark by the protrusion is left on the friction rubber at a location corresponding to the position of the inner diameter thread, and by using this contact mark as a marker for the screw insertion hole, it becomes possible to easily position the screw insertion hole. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram showing the structure of a passenger conveyor to which a positioning jig according to an embodiment is applied; [Figure 2] FIG. 10 is an enlarged view of a portion of the handrail drive wheel. [Figure 3] 3 is a cross-sectional view of the handrail drive wheel taken along the line AA in FIG. 2. [Figure 4] FIG. 10 is a diagram illustrating the structure of a positioning jig. [Figure 5] 10A and 10B are diagrams for explaining a process of attaching a positioning jig. [Figure 6] 10A and 10B are diagrams for explaining a step of adding positioning marks to the friction rubber. [Figure 7] 10A and 10B are diagrams showing modified examples of the protrusions of the positioning jig according to the first embodiment. [Figure 8] 10A and 10B are diagrams for explaining the configuration of a positioning jig according to the second embodiment. [Figure 9] 10A and 10B are diagrams for explaining a step of attaching a positioning jig according to the second embodiment. [Figure 10] 10A and 10B are diagrams for explaining the configuration of a positioning jig according to a third embodiment. [Figure 11] 11A and 11B are diagrams for explaining a step of attaching a positioning jig according to the third embodiment. [Figure 12] 10 is a diagram for explaining the configuration of an attachment / detachment tool for attaching and detaching a positioning jig according to a third embodiment. FIG. [Figure 13] 13A and 13B are diagrams for explaining a step of removing the positioning jig according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment will be described with reference to the drawings. Note that elements common to the various drawings are given the same reference numerals and redundant explanations will be omitted.

[0011] 1. First Embodiment 1-1. Passenger conveyor configuration FIG. 1 is a diagram showing the structure of a passenger conveyor to which a positioning jig according to an embodiment is applied. FIG. 1 shows an escalator as an example of a passenger conveyor. Escalator 1 is applied to a facility. The facility may be, for example, an indoor facility, an outdoor facility, or a complex facility. In this example, the facility has multiple floors. Escalator 1 is installed between an upper floor and a lower floor of the facility. At this time, escalator 1 transports passengers between the upper and lower floors. Entrances 2 for escalator 1 are provided on the upper and lower floors of the facility. Entrances 2 are locations where passengers get on and off escalator 1. One entrance 2 is the departure entrance 2 where passengers get on escalator 1. The other entrance 2 is the arrival entrance 2 where passengers get off escalator 1.

[0012] The escalator 1 includes a plurality of steps 3, a pair of moving handrails 4, and a pair of handrail drive wheels 10.

[0013] Each step 3 is a device that moves in a circular motion by a driving force generated by a motor or the like (not shown). Each step 3 moves on an outward route from the departure gate 2 to the arrival gate 2, and moves on a return route that is lower than the outward route from the arrival gate 2 to the departure gate 2. The multiple steps 3 are arranged in a staircase pattern on the sloped portion of the outward route.

[0014] Each moving handrail 4 is a device that moves in a circular motion on the escalator 1. Each moving handrail 4 moves on the outbound path from the departure entrance 2 to the arrival entrance 2, and moves on the return path, which is lower than the outbound path, from the arrival entrance 2 to the departure entrance 2. Each moving handrail 4 is made of a flexible, endless member. One moving handrail 4 is positioned on the left side of the multiple steps 3. The other moving handrail 4 is positioned on the right side of the multiple steps 3. Each moving handrail 4 moves while being guided by a guide rail 6 on the outbound path, etc.

[0015] Each handrail drive wheel 10 is a device that rotates by a driving force generated by a motor or the like that drives the multiple steps 3. Each handrail drive wheel 10 corresponds to one of the moving handrails 4. Each handrail drive wheel 10 is a device that drives the corresponding moving handrail 4 by rotation so that the corresponding moving handrail 4 can move in a circular motion. The handrail drive wheel 10 that corresponds to the right moving handrail 4 is arranged on the right side of the multiple steps 3. The handrail drive wheel 10 that corresponds to the left moving handrail 4 is arranged on the left side of the multiple steps 3. Each handrail drive wheel 10 is wrapped around the curved portion 4a that is bent downward on the return path of the corresponding moving handrail 4.

[0016] Fig. 2 is an enlarged view of a portion of the handrail drive wheel. Fig. 3 is a cross-sectional view of the handrail drive wheel in Fig. 2 taken along section AA. Friction rubber 20 is attached to the outer peripheral surface 12 of the handrail drive wheel 10. A recessed groove 14 is formed around the entire circumference of the outer peripheral surface 12 of the handrail drive wheel 10, recessed along the circumferential direction. The friction rubber 20 has a protrusion 22 that fits into the recessed groove 14 of the handrail drive wheel 10. A plurality of internal threads 16 are formed radially inward on the outer peripheral surface 12 of the handrail drive wheel 10, spaced apart in the circumferential direction. The internal threads 16 are provided in approximately 20 to 30 locations, for example, at intervals of approximately 150 mm.

[0017] The existing friction rubber 20 has screw insertion holes 24 drilled at positions corresponding to the multiple internal thread portions 16. The friction rubber 20 is press-fitted so that the convex portions 22 fit into the concave groove portions 14 of the handrail drive wheel 10, and then the flat head screws 8 are fixed in place by the internal thread portions 16 through the screw insertion holes 24. Note that in order to prevent interference with the moving handrail 4, the flat head screws 8 are tightened to a position where their heads are embedded in the screw insertion holes 24 of the friction rubber 20.

[0018] 1-2. Issues when replacing friction rubber During maintenance work on the escalator 1, the friction rubber 20 of the moving handrail 4 may need to be replaced. At this time, the handrail drive wheel 10 is removed, and then the existing friction rubber 20 is removed. Then, the worker performing the maintenance work attaches new friction rubber 20 to the handrail drive wheel 10 of the escalator 1.

[0019] The new friction rubber 20 does not have any screw insertion holes 24 formed. Therefore, workers must drill multiple screw insertion holes 24 in the friction rubber 20 so that they match the positions of the multiple internal threaded portions 16 of the handrail drive wheel 10. In this case, one possible method is to overlap the old and new friction rubber, tightly secure them together, and then use the existing screw insertion holes in the old friction rubber as transfer holes to drill holes in the new friction rubber. However, with this method, there is a risk that the screw insertion holes 24 drilled in the new friction rubber 20 will be misaligned due to accumulated misalignment from previous hole drilling operations or misalignment during fixation, etc.

[0020] The positioning jig of this embodiment is a jig for determining the accurate position of the screw insertion hole 24 to be formed in the friction rubber 20 during the replacement work of the friction rubber 20 of the handrail drive wheel 10. The configuration of the positioning jig will be described in detail below.

[0021] 1-3.Configuration of positioning jig FIG. 4 is a diagram illustrating the structure of the positioning jig. In FIG. 4, (a) shows a plan view of the positioning jig, (b) shows a front view of the positioning jig, and (c) shows a B-B cross-sectional view of the positioning jig. The positioning jig 30 includes a main body 31, an engaging portion 32, a protrusion 33, and a restricting portion 34. The main body 31 is cylindrical, and an outer diameter thread that screws into the inner diameter thread portion 16 is formed on its outer circumferential surface. The engaging portion 32 is a bottomed hole in the shape of a hexagonal prism formed on the upper surface of the main body 31. The engaging portion 32 has a two-flat width that is sized to engage with the tightening / loosening tool 40 described below. The protrusion 33 is a protrusion configured to protrude upward in a circular shape from the periphery of the engaging portion 32 on the upper surface of the main body 31. The tip of the protrusion 33 is configured to be sharp enough to leave a contact mark on the friction rubber 20 that is in close contact with the friction rubber 20. The restricting portion 34 is a portion on the upper edge of the outer circumferential surface of the main body portion 31, which has a diameter equal to or greater than that of the main body portion 31 and is not formed with an external thread.

[0022] 1-3. Procedure for positioning screw insertion holes using a positioning jig Next, a procedure for determining the positions of the screw insertion holes 24 formed in the friction rubber 20 using the positioning jig 30 will be described.

[0023] 1-3-1. Positioning jig installation process 5 is a diagram illustrating the installation process of the positioning jig. A tightening / loosening tool 40 is used to tighten or loosen the positioning jig 30. The tightening / loosening tool 40 is a flat wrench that includes a hexagonal bar-shaped tightening / loosening portion 42 and a gripping portion 44. The gripping portion 44 may be configured as an electric screwdriver. The tightening / loosening portion 42 may be magnetic. There are no limitations on the configuration of the tightening / loosening tool 40, as long as it is a flat wrench that has a width across flats that can engage with the engaging portion 32 of the positioning jig 30.

[0024] The worker removes the flat head screws 8 that secure the existing friction rubber 20 from the handrail drive wheel 10. Then, using a tightening / loosening tool 40, the worker screws the positioning jig 30 into the internal thread portion 16 to which the flat head screws 8 were previously secured. Because the restricting portion 34 does not have an external thread, tightening the positioning jig 30 to a position where it cannot rotate restricts the position of the positioning jig 30 to a position where the restricting portion 34 comes into contact with the open end of the internal thread portion 16. This ensures that the protrusion 33 protrudes radially outward from the outer circumferential surface 12 of the handrail drive wheel 10. This operation is performed sequentially for each of the multiple internal thread portions 16.

[0025] 1-3-2. Adding positioning marks to friction rubber 6 is a diagram illustrating the process of adding positioning marks to the friction rubber. In the positioning mark adding process, a worker fits the friction rubber 20 to be newly installed on the handrail drive wheel 10 to which multiple positioning jigs 30 have been attached. Here, starting from the tip of the friction rubber 20, a hammer or the like is used to fit the convex portion 22 into the concave groove portion 14 of the handrail drive wheel 10 to ensure close contact. This presses the protrusion 33 protruding from the outer peripheral surface 12 of the handrail drive wheel 10 against the friction rubber 20, leaving a circular positioning mark on the surface of the friction rubber 20 due to the protrusion 33. After the friction rubber 20 has been fitted around the entire circumference of the handrail drive wheel 10, it is removed.

[0026] According to the above work procedure, it is possible to add with high precision positioning marks to the new friction rubber 20 that correspond to the position of the inner diameter thread portion 16 on the outer peripheral surface 12 of the handrail drive wheel 10. This makes it possible to drill screw insertion holes in accurate positions, improving the quality of the replacement of the friction rubber 20, shortening the installation time, and improving productivity.

[0027] 1-4. Modification of the positioning jig of the first embodiment The positioning jig 30 of the first embodiment may adopt the following modified forms.

[0028] 1-4-1.Protrusion 33 The shape of the tip of the protrusion 33 is not limited to a circumferential shape. That is, the protrusion 33 may have any other shape, such as a polygonal shape, as long as it is configured in a circumferential shape so as to surround the periphery of the engagement portion 32.

[0029] Furthermore, the tip of the protrusion 33 may have a sawtooth shape. Fig. 7 is a diagram showing a modified example of the protrusion of the positioning jig of embodiment 1. The protrusion 35 of the modified example has a sawtooth shape at the tip of the protrusion 33. With this configuration of the protrusion 35 of the positioning jig 30, stress is concentrated at the sawtooth tip, making it easier to bite into the friction rubber 20 that has been brought into close contact. This makes it easier to leave positioning marks on the friction rubber 20, improving the convenience of the positioning jig 30.

[0030] 1-4-2. Engagement portion 32 The engaging portion 32 is not limited to a hexagonal shape and may have any other shape as long as it can engage with the tightening / loosening tool 40 to tighten or loosen the positioning jig 30 to the inner diameter thread portion 16 .

[0031] 1-4-3.Regulatory Section 34 The configuration of the restricting portion 34 is not essential.

[0032] 2. Second Embodiment 2-1. Features of the positioning jig in the second embodiment 8 is a diagram illustrating the configuration of a positioning jig according to embodiment 2. In FIG. 8, (a) shows a plan view of the positioning jig, (b) shows a front view of the positioning jig, and (c) shows a DD cross-sectional view of the positioning jig. The positioning jig 50 shown in this figure includes a main body 51, an engaging portion 52, a protrusion 53, and a restricting portion 54. The main body 51 has the same structure as the main body 31 of the positioning jig 30, and an outer diameter thread that screws into the inner diameter thread portion 16 is formed on the outer circumferential surface.

[0033] The protrusion 53 is a cone-shaped protrusion that protrudes upward from the center on the upper surface of the main body 51. The tip of the protrusion 53 is sharp enough to leave a contact mark on the friction rubber 20 that is in close contact with the protrusion 53.

[0034] The engagement portions 52 are two cylindrical, bottomed holes formed around the protrusions 53 on the upper surface of the main body 31. The engagement portions 52 are formed in a shape that allows them to engage with a tightening / loosening tool 60, which will be described later. The restriction portion 54 is a portion on the upper edge of the outer circumferential surface of the main body 51 where no external threads are formed.

[0035] 9 is a diagram illustrating the attachment process of the positioning jig of the second embodiment. A tightening / loosening tool 60 is used to tighten or loosen the positioning jig 50. The tightening / loosening tool 60 includes a tightening / loosening portion 62 and a gripping portion 64. The gripping portion 64 may be configured as an electric screwdriver. The tightening / loosening portion 62 may be magnetic. The tightening / loosening portion 62 includes two protrusions 66 and a recess 68. The two protrusions 66 have a shape that allows them to engage with the engaging portions 52 of the positioning jig 50. The recess 68 is a cutout portion that prevents the protrusions 53 of the positioning jig 50 from interfering with the tightening / loosening portion 62 when the two protrusions 66 are engaged with the engaging portions 52 of the positioning jig 50.

[0036] The worker removes the flat head screws 8 that secure the existing friction rubber 20 from the handrail drive wheel 10. Then, using a tightening / loosening tool 60, the worker screws the positioning jig 50 into the inner diameter threaded portion 16 to which the flat head screws 8 were previously secured. Because the restricting portion 54 does not have an outer diameter thread, tightening the positioning jig 50 to a position where it cannot rotate restricts the position of the positioning jig 50 to a position where the restricting portion 54 contacts the open end of the inner diameter threaded portion 16. This ensures that the protrusion 53 protrudes radially outward from the outer circumferential surface 12 of the handrail drive wheel 10. This operation is performed sequentially for each of the multiple inner diameter threaded portions 16. With this positioning jig 50, the protrusion 53 can form positioning marks in the friction rubber 20.

[0037] 2-2. Modification of the positioning jig of the second embodiment The positioning jig 50 of the second embodiment may adopt the following modified forms.

[0038] 2-2-1. Engagement portion 52 and protrusion portion 66 The shapes of the engaging portion 52 and the protruding portion 66 are not limited as long as they are configured to be engageable with each other.

[0039] 2-2-2.Regulatory Department 54 The configuration of the restricting portion 54 is not essential.

[0040] 3. Embodiment 3 3-1. Features of the positioning jig in the third embodiment Fig. 10 is a diagram for explaining the configuration of a positioning jig according to embodiment 3. In Fig. 10, (a) shows a plan view of the positioning jig, and (b) shows a front view of the positioning jig. The positioning jig 70 shown in this figure is characterized in that it is fixed to the inner diameter thread portion 16 by an anchor clip structure. Specifically, the positioning jig 70 includes a main body portion 71, an anchor portion 72, an engaging portion 73, a protrusion portion 74, and a restricting portion 75.

[0041] The main body 71 is a cylindrical component having a smaller diameter than the internal thread 16. A flange-like restricting portion 75 having a larger diameter than the internal thread 16 is provided at the upper edge of the main body 71. The anchor portion 72 is a cylindrical member inserted into the cylindrical main body 71, and has a large-diameter portion 72a at its upper end that is larger than the internal diameter of the main body 71, and a small-diameter portion 72b at its lower end that is smaller than the internal diameter of the main body 71. When the large-diameter portion 72a is inserted into the cylindrical main body 71, the main body 71 is expanded from the inside, thereby fixing the main body 71 to the internal thread 16. A protrusion 74 is provided on the upper surface of the anchor portion 72. The protrusion 74 is, for example, a cone-shaped protrusion configured to protrude upward from the center on the upper surface of the anchor portion 72. The engagement portion 73 is configured to protrude in a flange-like manner from the upper edge of the anchor portion 72. The engaging portion 73 is a portion that engages with an attachment / detachment tool, which will be described later, when attaching or detaching the positioning jig 70.

[0042] Fig. 11 is a diagram for explaining the attachment process of the positioning jig of embodiment 3. An attachment / detachment tool 80 is used to attach and detach the positioning jig 70. Fig. 12 is a diagram for explaining the configuration of the attachment / detachment tool for attaching and detaching the positioning jig of embodiment 3. The attachment / detachment tool 80 has a first flat surface portion 81 and a second flat surface portion 82 bent relative to the first flat surface portion 81. The first flat surface portion 81 is formed with a relief portion 83 for the protrusion portion 74 and a notch portion 84. The second flat surface portion 82 is the portion that is gripped by an operator.

[0043] When attaching the positioning jig 70 to the inner diameter thread portion 16 of the handrail drive wheel 10, first, with the anchor portion 72 pulled out from the main body portion 71, insert the main body portion 71 into the inner diameter thread portion 16 until the restricting portion 75 contacts the outer peripheral surface 12. Then, press the first flat portion 81 against the upper surface of the engaging portion 73 and push it downward so that the protruding portion 74 protrudes from the recessed portion 83 of the attachment / detachment tool 80. This expands the outer diameter of the main body portion 71, and the positioning jig 70 is fixed to the inner diameter thread portion 16.

[0044] 13 is a diagram illustrating the removal process of the positioning jig according to embodiment 3. When removing the positioning jig 70 from the inner diameter thread portion 16 of the handrail drive wheel 10, first, the first flat portion 81 is inserted into the underside of the engaging portion 73 so that the notch portion 84 of the attachment / detachment tool 80 is aligned with the upper end of the anchor portion 72, and then the attachment / detachment tool 80 is pushed upward. This causes the large diameter portion 72a of the anchor portion 72 to be pulled out from the main body portion 71, releasing the positioning jig 70 from the inner diameter thread portion 16 and allowing it to be removed.

[0045] Thus, according to the positioning jig 70 of the third embodiment, the anchor clip structure makes it possible to easily attach and detach the positioning jig 70. Furthermore, the restricting portion 75 can prevent the positioning jig 70 from being buried in the inner diameter thread portion 16, so that the protrusion 74 can reliably protrude from the inner diameter thread portion 16.

[0046] 3-2. Modification of the positioning jig of the third embodiment The positioning jig 70 of the third embodiment may adopt the following modified forms.

[0047] 3-2-1.Protrusion 74 There are no limitations on the shape of the protrusion 74 as long as it can form a positioning mark on the friction rubber 20. For example, the protrusion 74 may have a shape similar to that of the protrusion 33 of the positioning jig 30 of the first embodiment.

[0048] 3-2-2.Regulatory Department 75 The configuration of the restricting portion 75 is not essential.

[0049] 4.Other Although the preferred embodiments have been described in detail above, the present disclosure is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims. [Explanation of symbols]

[0050] 1 escalator, 2 boarding / alighting door, 4 moving handrail, 4a curved portion, 6 guide rail, 8 countersunk head screw, 10 handrail drive wheel, 12 outer periphery, 14 groove portion, 16 internal diameter thread portion, 20 friction rubber, 22 convex portion, 24 screw insertion hole, 30 positioning jig, 31 main body portion, 32 engaging portion, 33 protrusion portion, 34 restricting portion, 35 protrusion portion, 40 tightening / loosening tool, 42 tightening / loosening portion, 44 gripping portion, 50 positioning jig, 51 main body portion, 52 engaging portion, 53 protrusion portion, 54 restricting portion, 60 tightening / loosening tool, 62 tightening / loosening portion, 64 gripping portion, 66 protrusion portion, 68 relief portion, 70 positioning jig, 71 Main body portion, 71a large diameter portion, 72 anchor portion, 73 engagement portion, 74 protrusion portion, 75 restriction portion, 80 attachment / detachment tool, 81 first flat portion, 82 second flat portion, 83 relief portion, 84 notch portion

Claims

1. A positioning jig for a screw insertion hole formed in a friction rubber attached along the outer circumferential surface of a handrail drive wheel that wraps around an endless moving handrail of a passenger conveyor and moves it around, The handrail drive wheel includes a plurality of inner diameter screw portions for screwing the friction rubber through the screw insertion holes from the outer circumferential surface toward the radially inward direction, The positioning jig is a cylindrical main body portion that engages with the inner diameter thread portion; a protrusion that protrudes from the outer circumferential surface when the main body is engaged with the inner diameter threaded portion; an engaging portion that engages with a tool for engaging the main body portion with the inner diameter thread portion, The positioning jig is configured so that when the friction rubber is brought into close contact with the outer peripheral surface with the main body engaged with the inner diameter thread portion, the protrusion leaves a contact mark on the friction rubber.

2. The positioning jig according to claim 1 , wherein the protrusion has a tip end that protrudes circumferentially from the upper surface of the main body.

3. the tool is a wrench; an outer diameter thread that screws into the inner diameter thread portion is formed on the outer peripheral surface of the main body; The engaging portion includes a hole on the upper surface of the main body that fits with the wrench. The positioning jig according to claim 2 .

4. The main body portion is a restricting portion on the upper edge of the outer circumferential surface where the outer diameter thread is not formed; The positioning jig according to claim 3 .

5. The tip of the protrusion is formed in a sawtooth shape. The positioning jig according to any one of claims 2 to 4.

6. The positioning jig according to claim 1 , wherein the protrusion has a tip that protrudes in a cone shape from the upper surface of the main body.

7. The tool is a tightening / loosening tool having a plurality of protrusions, an outer diameter thread that screws into the inner diameter thread portion is formed on the outer peripheral surface of the main body; The engaging portion includes a plurality of recesses around the cone-shaped protrusion that are fitted with the plurality of protrusions of the tightening / loosening tool. The positioning jig according to claim 6.

8. the positioning jig includes the tightening / loosening tool, The tightening and loosening tool is 8. The positioning jig according to claim 7, further comprising a clearance portion for avoiding interference with the protrusions when the protrusions are fitted into the recesses.

9. The main body portion is a restricting portion on the upper edge of the outer circumferential surface where the outer diameter thread is not formed; The positioning jig according to claim 7 or 8.

10. The protrusion is configured so that a tip thereof protrudes in a cone shape from the upper surface of the main body, The main body portion includes an anchor clip structure that is inserted into and engaged with the internal thread portion. The positioning jig according to claim 1 .

11. A positioning method for engraving positioning marks for the screw insertion holes in the friction rubber using the positioning jig according to claim 1, a step of engaging the main body portion of the positioning jig with each of the plurality of inner diameter screw portions of the handrail drive wheel; a step of closely contacting the friction rubber along the outer circumferential surface of the handrail drive wheel; removing the friction rubber from the outer circumferential surface; A positioning method comprising:

Images