Jig for removing drive roller

Abstract

A jig for removing a drive roller according to the present disclosure comprises: a first plate member; a second plate member facing the first plate member; side plates connecting the first plate member and the second plate member on the short sides thereof; a bolt insertion hole provided in the first plate member; a bolt inserted into the bolt insertion hole; and a U-shaped notch provided in the second plate member so as to include the projection position where the bolt insertion hole is projected onto the second plate member. When a drive roller is placed in the space between the first plate member and the second plate member and the leading end of the bolt is made to contact the shaft of the drive roller, the rim of the notch contacts a metal portion of the drive roller.

Description

Drive roller removal jig

[0001] The present disclosure relates to a drive roller removal tool.

[0002] Patent Document 1 listed below discloses a roller removal jig for removing a roller from its mounting shaft, which is made up of an operating body with a grip portion that is approximately perpendicular to a screw shaft whose lower tip abuts against the mounting shaft, and a frame body that has a threaded hole formed in the center of its upper surface into which the screw shaft screws and has a pair of locking claws at its lower tip that are inserted into the lower part of the roller.

[0003] Japanese Patent Application Publication No. 2001-347470

[0004] In the conventional roller removal jig described above, the positions of the pair of locking claws tend to shift from the roller, making it difficult to accurately position the pair of locking claws relative to the roller.

[0005] In addition, a gear puller may be used to remove the drive roller installed on the elevator's landing door, but there is not enough space at the base of the drive roller for the gear puller's claws to fit securely, resulting in a shallow grip and making the gear puller prone to coming off. Furthermore, if you support the gear puller with your left hand and use a wrench with your right hand to turn the set screw, there is a risk that the drive roller will fall when it comes off the shaft. Furthermore, the set screw of the gear puller must be turned with a wrench, making it difficult to work with.

[0006] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a drive roller removal jig that can easily remove a drive roller from a shaft.

[0007] The drive roller removal jig according to the present disclosure comprises a first plate, a second plate facing the first plate, side plates connecting the first plate and the second plate at their respective short sides, a bolt insertion hole formed in the first plate, a bolt inserted into the bolt insertion hole, and a U-shaped notch formed in the second plate so as to include the projected position of the bolt insertion hole onto the second plate; when a drive roller is placed in the space between the first plate and the second plate, and the tip of the bolt is brought into contact with the shaft of the drive roller, the edge of the notch comes into contact with a metal portion of the drive roller.

[0008] According to the present disclosure, it is possible to provide a drive roller removal jig that can easily remove a drive roller from a shaft.

[0009] 7 is a perspective view showing a drive roller removal jig according to embodiment 1. FIG. 1 is a perspective view of the drive roller removal jig shown in FIG. 1, seen from diagonally below. FIG. 2 is a bottom view of the drive roller removal jig shown in FIG. 1, seen from below. FIG. 2 is a perspective view of the drive roller removal jig shown in FIG. 1, seen from diagonally below. FIG. 3 is a four-view diagram of the main body of the drive roller removal jig shown in FIG. 1. FIG. 4 is a three-view diagram of the handle bolt of the drive roller removal jig shown in FIG. 1. FIG. 5 is a front view showing the drive roller disposed in the space between the first plate material and the second plate material. FIG. 6 is a view showing the drive roller removed from the shaft. FIG. 7 is a perspective view showing the state when the bolt is tightened from the state of FIG. 7. FIG. 8 is a perspective view showing the state after the drive roller has been removed from the shaft. FIG. 9 is a perspective view showing the state after the drive roller has been removed from the shaft.

[0010] Hereinafter, embodiments will be described with reference to the drawings. Common or corresponding elements in each drawing are designated by the same reference numerals, and descriptions thereof will be simplified or omitted. Note that the configurations shown in the following embodiments are examples of the technical ideas of the present disclosure, and may be combined with other known technologies, or multiple technical ideas described in the present disclosure may be combined. Furthermore, it is also possible to omit or modify part of the configuration without departing from the gist of the present disclosure.

[0011] Embodiment 1. Figure 1 is a perspective view showing a drive roller removal jig according to embodiment 1. Figure 2 is a perspective view of the drive roller removal jig shown in Figure 1, viewed obliquely from below. Figure 3 is a bottom view of the drive roller removal jig shown in Figure 1, viewed obliquely from below. Figure 4 is a perspective view of the drive roller removal jig shown in Figure 1, viewed obliquely from below. Figure 5 is a four-view diagram of the main body of the drive roller removal jig shown in Figure 1. Figure 6 is a three-view diagram of a handle-equipped bolt of the drive roller removal jig shown in Figure 1.

[0012] As shown in Figure 1, the drive roller removal jig 1 of this embodiment includes a rectangular first plate 2, a rectangular second plate 3 facing the first plate 2, and side plates 4 connecting the first plate 2 and the second plate 3 at their respective short sides. In the example shown, the side plates 4 are provided on both longitudinal sides of the first plate 2 and the second plate 3. The side plates 4 are perpendicular to the first plate 2 and the second plate 3. The first plate 2, the second plate 3, and the side plates 4 form a main body 10 of the drive roller removal jig 1.

[0013] A bolt insertion hole 5 is provided in the first plate 2. In the illustrated example, the bolt insertion hole 5 is formed by welding a nut so that the position of the hole formed in the first plate 2 and the position of the hole in the nut are aligned. A bolt 6 is inserted into the bolt insertion hole 5. A handle portion 8 that assists in rotating the bolt 6 is attached to the bolt 6. The handle portion 8 is inserted into a hole formed in the head of the bolt 6 and is movable in the longitudinal direction of the handle portion 8. By providing such a handle portion 8, the bolt 6 can be easily rotated.

[0014] A U-shaped notch 7 is formed in the second plate 3. The notch 7 is formed so as to include the position where the bolt insertion hole 5 is projected onto the second plate 3.

[0015] FIG. 7 is a front view showing the drive roller 80 disposed in the space between the first plate 2 and the second plate 3. FIG. 8 is a view showing the drive roller 80 removed from its shaft. As shown in FIG. 8, the drive roller 80 has a rubber portion 81 and a metal portion 82 located on the inner periphery of the rubber portion 81. A bearing 83 is provided in the center of the metal portion 82. The bearing 83 is composed of an inner ring 84 and an outer ring 85. The shaft 86 of the drive roller 80 is press-fitted into the inner ring 84. The drive roller 80 is installed in the elevator hall door.

[0016] 7 , when the drive roller 80 is placed in the space between the first plate 2 and the second plate 3 and the tip of the bolt 6 is brought into contact with the shaft 86 of the drive roller 80, the edge of the notch 7 comes into contact with the metal portion 82 of the drive roller 80. Therefore, when the bolt 6 is tightened, force is applied to the metal portion 82 rather than the rubber portion 81 of the drive roller 80, so the rubber portion 81 does not separate from the metal portion 82, and the drive roller 80 can be easily and reliably removed from the shaft 86. At this time, the edge of the notch 7 may come into contact with the bearing 83 of the drive roller 80.

[0017] Figure 9 is a perspective view of the drive roller 80. Figures 10 and 11 are perspective views showing a state in which the bolt 6 is tightened from the state shown in Figure 7. Figures 12 to 14 are perspective views showing a state in which the drive roller 80 has been removed from the shaft 86.

[0018] When the drive roller removal jig 1 is positioned at the position of the drive roller 80, the notch 7 comes into contact with and fits onto the shaft 86 of the drive roller 80 from the side, so that the center position of the bolt 6 overlaps the shaft 86 of the drive roller 80. This makes it easy to position the drive roller removal jig 1 in an appropriate position. By tightening the bolt 6 from this state, the drive roller 80 moves toward the first plate material 2, and as shown in Figures 10 and 11 , the drive roller 80 comes off the shaft 86.

[0019] 12 to 14, in this embodiment, after the drive roller 80 is removed from the shaft 86, the bolt 6 remains inserted through the central hole of the drive roller 80. Therefore, there is no risk of the drive roller 80 falling off.

[0020] 5, the bolt insertion hole 5 is positioned toward the long side from the center of gravity of the first plate 2. The notch 7 opens toward the long side of the two long sides of the second plate 3 that is closest to the position where the bolt insertion hole 5 is projected onto the second plate 3. With this configuration, the notch 7 can be made smaller than when the bolt insertion hole 5 is positioned at the center, and the strength of the second plate 3 can be maintained.

[0021] 5, the notch 7 is formed by a semicircle and line segments extending from both ends of the semicircle. The diameter of the semicircle corresponds to the diameter of the notch 7. The diameter of the notch 7 is larger than the diameter of the shaft 86 of the drive roller 80 and smaller than the diameter of the metal portion 82 of the drive roller 80. This ensures that the second plate 3 comes into contact with the metal portion 82 of the drive roller 80, allowing the drive roller 80 to be easily and reliably removed from the shaft 86 without the rubber portion 81 separating from the metal portion 82.

[0022] 2 and 14, the tip of the bolt 6 is tapered. This more reliably prevents the tip of the bolt 6 from shifting from the shaft 86 of the drive roller 80 when the bolt 6 is tightened. Furthermore, as shown in Fig. 6, the length of the bolt 6 is set so that the tip of the bolt 6 is positioned at the same position as the second plate 3 when the bolt 6 is fully inserted through the bolt insertion hole 5. This ensures that the length of the bolt 6 is sufficient.

[0023] REFERENCE SIGNS LIST 1 Drive roller removal jig, 2 First plate, 3 Second plate, 4 Side plate, 5 Bolt insertion hole, 6 Bolt, 8 Handle portion, 10 Main body, 80 Drive roller, 81 Rubber portion, 82 Metal portion, 83 Bearing, 84 Inner ring, 85 Outer ring, 86 Shaft

Claims

1. A drive roller removal jig comprising: a first plate; a second plate facing the first plate; side plates connecting the first plate and the second plate at their respective short sides; a bolt insertion hole formed in the first plate; a bolt inserted into the bolt insertion hole; and a U-shaped notch formed in the second plate so as to include the projected position of the bolt insertion hole onto the second plate; wherein a drive roller is disposed in the space between the first plate and the second plate; and when the tip of the bolt is brought into contact with the shaft of the drive roller, the edge of the notch comes into contact with a metal part of the drive roller.

2. A drive roller removal jig as claimed in claim 1, wherein the bolt is fitted with a handle portion for assisting in turning the bolt.

3. A drive roller removal jig as described in claim 1 or claim 2, wherein when the notch contacts and fits with the shaft of the drive roller from the side, the center position of the bolt is positioned so as to overlap the shaft of the drive roller.

4. A drive roller removal jig as claimed in any one of claims 1 to 3, wherein the bolt insertion hole is located at a position offset from the center of gravity of the first plate material towards the long side.

5. A drive roller removal jig according to any one of claims 1 to 4, wherein the diameter of the notch is larger than the diameter of the shaft of the drive roller and smaller than the diameter of the metal portion of the drive roller.

6. A drive roller removal jig as claimed in any one of claims 1 to 5, wherein the tip of the bolt is tapered.

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