Screw removal jig and screw removal attachment

Abstract

This invention provides a screw removal tool that reduces the risk of the screwdriver's tip stripping the recess in the screw head. [Solution] The screw removal jig 1 is attached to a screwdriver. The screw removal jig 1 comprises a jig body 11 and a plurality of screw engagement parts 21. The jig body 11 has an insertion hole 16 through which a screwdriver is inserted. The screw engagement parts 21 are provided on the jig body 11. The screw engagement part 21 has a screw engagement part body 22 guided by the jig body 11 and a screw contact part 23. The screw contact part 23 extends toward the central axis 16Z of the insertion hole 16. The screw engagement part 21 is provided on the jig body 11 such that the distance between the tip 23A of the screw contact part 23 and the central axis changes as the screw engagement part 21 moves in a direction inclined toward the central axis 16Z of the insertion hole 16 relative to the jig body 11.

Description

Technical Field

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[0001] The present disclosure relates to a screw removal jig and a screw removal attachment.

Background Art

[0002] Screws are used when joining members. A recess is provided in the screw head as a portion that engages with a driver. The recess in the screw head is configured in a cross shape as an example. Screws may be fixed to members due to rust or the like. A fixed screw may be difficult to rotate with a driver. If the screw does not rotate even when the driver rotates, the driver rotates freely in the recess of the screw head. In this case, there is a risk that the driver may crush the recess of the screw head. Patent Document 1 discloses a screw removal device. The screw removal device rotates the screw while the tip of the driver engages with the screw head and the periphery of the screw head is sandwiched by the fixing claws.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, since the shape of the screw head has various forms, the screw head may not be fixed. In this case, the cutting edge of the driver may crush the recess of the screw head.

Means for Solving the Problems

[0005] (1) A screw removal jig that solves the above problem is a screw removal jig that can be attached to a screwdriver, comprising: a jig body having an insertion hole through which the driver shaft of the screwdriver is inserted; and a plurality of screw engagement parts provided on the jig body and engaging with a screw to be removed, wherein the screw engagement part has a screw engagement part body guided by the jig body and a screw contact part extending from a portion of the screw engagement part body away from the first end of the jig body toward the central axis of the insertion hole, and is provided on the jig body such that the distance between the tip of the screw contact part and the central axis changes as the screw engagement part moves in a direction inclined with respect to the jig body toward the central axis of the insertion hole.

[0006] In this configuration, the screw engagement portion moves in a direction inclined toward the central axis. Therefore, the screw engagement portion is positioned appropriately according to the shape of various screw head configurations. This prevents the recess in the screw head from being crushed.

[0007] (2) In the screw removal jig described in (1) above, the screw engagement portion is positioned on the jig body such that when the screw engagement portion moves relative to the jig body, the distance between the tip of the screw contact portion and the first end of the jig body becomes shorter, and the distance between the central axis of the insertion hole and the tip of the screw contact portion becomes shorter.

[0008] In this configuration, as the distance between the tip of the screw contact portion and the first end of the jig body decreases, the distance between the central axis of the insertion hole and the tip of the screw contact portion also decreases. Therefore, with this screw removal jig, the screw head can be pulled towards the jig body by the screw engagement portion.

[0009] (3) The screw removal jig described in (2) above further comprises a first operating part for moving the screw engagement part, wherein the screw engagement part body has a first male thread on its outer circumferential surface, the first operating part is positioned outside the screw engagement part body and has a first female thread that engages with the first male thread, and the screw engagement part moves as the first operating part rotates.

[0010] In this configuration, the screw engagement portion moves in a direction that is inclined toward the central axis of the insertion hole in the jig body by rotating the first operating portion.

[0011] (4) The screw removal jig described in (3) above further comprises a plurality of screwdriver fixing parts for fixing the jig body to the screwdriver shaft. With this configuration, the jig body can be fixed to the screwdriver shaft by the screwdriver fixing parts.

[0012] (5) In the screw removal jig described in (4) above, the jig body has a second end opposite to the first end, and the screwdriver fixing part has a screwdriver fixing part body guided by the jig body, and a screwdriver contact part provided on the screwdriver fixing part body so as to be positioned away from the second end on the jig body, and is provided on the jig body such that the distance between the friction surface of the screwdriver contact part and the central axis changes as the screwdriver fixing part moves relative to the jig body. With this configuration, the jig body can be fixed to the screwdriver shaft by the friction surface of the screwdriver contact part.

[0013] (6) In the screw removal jig described in (5) above, the screwdriver fixing portion is positioned on the jig body such that when the screwdriver fixing portion moves relative to the jig body, the distance between the central axis of the insertion hole and the friction surface of the screwdriver contact portion becomes shorter as the distance between the friction surface of the screwdriver contact portion and the second end of the jig body increases.

[0014] With this configuration, the jig body can be fixed to the driver shaft by moving the friction surface diagonally with respect to the central axis of the insertion hole in the jig body.

[0015] (7) The screw removal jig described in (6) above further comprises a second operating part for moving the screwdriver fixing part, wherein the screwdriver fixing part body has a second male screw on its outer peripheral surface, the second operating part is positioned outside the screwdriver fixing part body and has a second female screw that engages with the second male screw, and the screwdriver fixing part moves as the second operating part rotates. With this configuration, the jig body can be fixed to the screwdriver shaft by rotating the second operating part.

[0016] (8) In the screw removal jig described in (7) above, when the first operating part rotates in the first rotational direction, the screw engaging part moves in the first direction, and when the second operating part rotates in the second rotational direction, the driver fixing part moves in the second direction, the first direction is the direction in which the screw engaging part moves in a direction in which the distance between the tip of the screw contact part and the first end of the jig body becomes shorter, and the second direction is the direction in which the driver fixing part moves in a direction in which the distance between the friction surface of the driver contact part and the second end of the insertion hole becomes longer, and the first rotational direction and the second rotational direction are the same rotational direction.

[0017] With this configuration, in the screw removal jig, rotating the first operating part in the first rotational direction can improve the contact between the screw head and the tip of the screwdriver. Furthermore, in the screw removal jig, rotating the second operating part in the second rotational direction can fix the jig body to the screwdriver shaft. The first rotational direction is the same as the second rotational direction. That is, the rotational direction of the first operating part when bringing the screw engagement part closer to the screw is the same as the rotational direction of the second operating part when bringing the screw contact part closer to the screwdriver shaft. In this way, since the operation of bringing the movable parts of the screw removal jig closer is the same direction for both the first and second operating parts, it is possible to suppress erroneous operation of the screw removal jig.

[0018] (9) In the screw removal jig described in (7) above, when the first operating part rotates in a first rotational direction, the screw engaging part moves in a first direction, and when the second operating part rotates in a second rotational direction, the screwdriver fixing part moves in a second direction, the first direction is the direction in which the screw engaging part moves in a direction in which the distance between the tip of the screw contact part and the first end of the jig body becomes shorter, the second direction is the direction in which the screwdriver fixing part moves in a direction in which the distance between the friction surface of the screwdriver contact part and the second end of the insertion hole becomes longer, and the first rotational direction is the rotational direction opposite to the second rotational direction.

[0019] With this configuration, in the screw removal jig, rotating the first operating part in the first rotational direction can increase the contact between the screw head and the tip of the screwdriver. Furthermore, in the screw removal jig, rotating the second operating part in the second rotational direction can fix the jig body to the screwdriver shaft. The first rotational direction is opposite to the second rotational direction. By gripping the first and second operating parts with both hands and performing a twisting motion, the contact between the screw head and the tip of the screwdriver can be increased and the screwdriver can be fixed in place.

[0020] (10) A screw removal jig according to any one of (1) to (9) above, further comprising a projection provided on the screw engagement portion body and a screw engagement portion stopper provided on the jig body, wherein the projection contacts the screw engagement portion stopper when the end of the screw engagement portion body reaches the vicinity of the first end of the jig body as the screw engagement portion moves in a direction that increases the distance between the tip of the screw contact portion and the first end of the jig body. This configuration makes it possible to prevent the screw engagement portion from detaching from the jig body.

[0021] (11) A screw removal attachment that solves the above problems is a screw removal attachment that can be attached to a power tool, comprising: an attachment body that can be detachably attached to the output shaft of the power tool; a driver shaft portion provided on the attachment body; and a screw engagement structure portion provided on the attachment body, wherein the screw engagement structure portion comprises: a jig body having an insertion hole through which the driver shaft portion is inserted; and a plurality of screw engagement portions provided on the jig body that engage with a screw to be removed, wherein the screw engagement portion comprises: a screw engagement portion body guided by the jig body; and a screw contact portion extending from a portion of the screw engagement portion body away from the first end of the jig body toward the central axis of the insertion hole, and is provided on the jig body such that the distance between the tip of the screw contact portion and the central axis changes as the screw engagement portion moves in a direction inclined with respect to the central axis of the insertion hole with respect to the jig body. With this configuration, the screw removal attachment can be attached to a power tool and used. [Effects of the Invention]

[0022] The screw removal jig and screw removal attachment of this disclosure reduce the risk of the screwdriver's tip damaging the recess in the screw head. [Brief explanation of the drawing]

[0023] [Figure 1] This is a perspective view of a screw removal jig according to the first embodiment. [Figure 2] It is a side view of the screw removal jig according to the first embodiment. [Figure 3] It is a bottom view of the screw removal jig as viewed from the direction of arrow A in FIG. 2. [Figure 4] It is a top view of the screw removal jig as viewed from the direction of arrow B in FIG. 2. [Figure 5] It is a cross-sectional view of the screw removal jig along the line 5-5 in FIG. 3. [Figure 6] It is a cross-sectional view of the screw removal jig when the second operation part is operated. [Figure 7] It is a cross-sectional view of the screw removal jig when the first operation part is operated. [Figure 8] It is a perspective view of the screw removal attachment according to the second embodiment. [Figure 9] It is a side view of the screw removal attachment according to the second embodiment. [Figure 10] It is a bottom view of the screw removal attachment as viewed from the direction of arrow C in FIG. 9. [Figure 11] It is a cross-sectional view of the screw removal attachment along the line 11-11 in FIG. 10.

Mode for Carrying Out the Invention

[0024] <First Embodiment> Referring to FIGS. 1 to 7, the screw removal jig 1 of the present embodiment will be described. As shown in FIG. 1, the screw removal jig 1 has a central axis Z1. Hereinafter, one of the two directions along the central axis Z1 of the screw removal jig 1 is defined as the positive direction DZ1A, and the direction opposite to the positive direction DZ1A is defined as the negative direction DZ1B. In the present embodiment, the positive direction DZ1A is downward in FIG. 2, and the negative direction DZ1B is upward in FIG. 2.

[0025] As shown in FIGS. 1 and 5, the screw removal jig 1 includes a jig main body 11 and a plurality of screw engaging portions 21.

[0026] [Jig body] As shown in Figure 5, the jig body 11 comprises a cylindrical portion 13, a first tapered portion 14, and a second tapered portion 15. The cylindrical portion 13 has a first hole 13H centered on the central axis Z1. The central axis of the cylindrical portion 13 coincides with the central axis Z1.

[0027] The first tapered portion 14 extends from the lower part of the cylindrical portion 13 in the positive direction DZ1A. The lower part of the cylindrical portion 13 is the portion of the cylindrical portion 13 that is on the positive direction DZ1A side. The first tapered portion 14 has a second hole 14H centered on the central axis Z1. The first tapered portion 14 has an outer circumferential surface 14A whose outer diameter increases as it approaches the positive direction DZ1A. The central axis of the first tapered portion 14 coincides with the central axis Z1.

[0028] The first tapered portion 14 is formed such that its outer circumferential surface 14A constitutes the outer circumferential surface of a frustum having a central axis along the central axis Z1. The outer circumferential surface 14A of the first tapered portion 14 is configured to slide against the inner circumferential surface 22A (see below) of the screw engagement portion body 22.

[0029] The second tapered portion 15 extends from the upper part of the cylindrical portion 13 in the negative direction DZ1B. The upper part of the cylindrical portion 13 is the portion of the cylindrical portion 13 on the negative direction DZ1B side. The second tapered portion 15 has a third hole 15H centered on the central axis Z1. The second tapered portion 15 has an outer circumferential surface 15A whose outer diameter decreases as it approaches the negative direction DZ1B. The central axis of the second tapered portion 15 coincides with the central axis Z1.

[0030] The second tapered portion 15 is formed such that its outer circumferential surface 15A constitutes the outer circumferential surface of a frustum having a central axis along the central axis Z1. The outer circumferential surface 15A of the second tapered portion 15 is configured to slide against the inner circumferential surface 32A (see below) of the driver fixing body 32.

[0031] As shown in Figures 5 to 7, the jig body 11 has an insertion hole 16. Specifically, the insertion hole 16 is configured as a communication hole for the first hole 13H of the cylindrical portion 13, the second hole 14H of the first tapered portion 14, and the third hole 15H of the second tapered portion 15. The cross-sectional shape of the insertion hole 16 is circular. The central axis 16Z of the insertion hole 16 coincides with the central axis Z1. The driver shaft portion 5 of the driver 4 is inserted through the insertion hole 16.

[0032] As shown in Figure 5, the jig body 11 has a first end 11A and a second end 11B. The second end 11B is the end opposite to the first end 11A. Specifically, the first end 11A is the end of the first tapered portion 14 on the positive direction DZ1A side. The second end 11B is the end of the second tapered portion 15 on the negative direction DZ1B side.

[0033] [Screw engagement part] As shown in Figure 5, multiple screw engagement portions 21 are provided on the jig body 11. The multiple screw engagement portions 21 are provided in the region on the first end 11A side of the jig body 11. In this embodiment, the region on the first end 11A side of the jig body 11 is the region including the first tapered portion 14. The multiple screw engagement portions 21 engage with the screw 7 to be removed.

[0034] As shown in Figure 5, the screw engagement portion 21 has a screw engagement portion body 22 and a screw contact portion 23.

[0035] The screw engagement portion body 22 is positioned outside the jig body 11. Specifically, the screw engagement portion body 22 is positioned outside the first tapered portion 14 of the jig body 11. The screw engagement portion body 22 is configured to follow a line L1 that intersects the central axis of the jig body 11 at an angle. The line L1 extends at an angle so as it moves in the negative direction DZ1B it approaches the central axis 16Z and intersects the central axis 16Z of the insertion hole 16.

[0036] The cross-sectional shape of the screw engagement portion body 22 is configured to be, for example, a fan shape. The screw engagement portion body 22 is positioned so that its inner circumferential surface 22A contacts the outer circumferential surface 14A of the first tapered portion 14 of the jig body 11 (see Figure 5).

[0037] As shown in Figure 5, the screw contact portion 23 extends from a portion of the screw engagement portion body 22 away from the first end portion 11A of the jig body 11 toward the central axis 16Z of the insertion hole 16.

[0038] As shown in Figure 3, the screw contact portion 23 has a fan shape when viewed from direction A in Figure 2. The screw contact portion 23 becomes narrower towards the tip portion 23A of the screw contact portion 23.

[0039] As shown in Figure 7, the screw engagement portion 21 is provided on the jig body 11 such that the distance between the tip portion 23A of the screw contact portion 23 and the central axis changes as the screw engagement portion 21 moves relative to the jig body 11 in a direction inclined with respect to the central axis 16Z of the insertion hole 16.

[0040] Specifically, the screw engagement portion 21 is positioned on the jig body 11 such that when the first vertical distance LD1 decreases during movement of the screw engagement portion 21 relative to the jig body 11, the radial distance LD2 decreases. The first vertical distance LD1 is the distance between the tip 23A of the screw contact portion 23 and the first end 11A of the jig body 11 in the direction along the central axis Z1. The radial distance LD2 is the distance between the central axis 16Z of the insertion hole 16 and the tip 23A of the screw contact portion 23 in the direction perpendicular to the central axis Z1.

[0041] In short, the radial distance LD2 is shortened as the screw engagement portion 21 moves in the first direction D1 (see Figure 7). Here, the first direction D1 is the direction in which the screw engagement portion 21 moves in a direction that shortens the first longitudinal distance LD1. The first direction D1 follows the line L1 described above.

[0042] In contrast, the radial distance LD2 increases as the screw engagement portion 21 moves in a third direction D3 opposite to the first direction D1.

[0043] [1st operation section] As shown in Figures 1 to 3 and Figures 5 to 7, the screw removal jig 1 further comprises a first operating part 41. The first operating part 41 moves the screw engaging part 21. The first operating part 41 is positioned outside the screw engaging part body 22. The first operating part 41 is cylindrical in shape. The central axis of the first operating part 41 coincides with the central axis Z1.

[0044] The first operating section 41 has a first female thread 61. Specifically, the first operating section 41 has a first female thread 61 on its inner circumferential surface 41A. The screw engagement section body 22 has a first male thread 65 on its outer circumferential surface 22B. The first female thread 61 engages with the first male thread 65. As a result, the first operating section 41 engages with the screw engagement section body 22 via the first female thread 61 and the first male thread 65.

[0045] As shown in Figure 7, the screw engagement portion 21 moves as the first operating portion 41 rotates. Specifically, by rotating the first operating portion 41, the screw engagement portion body 22 moves so as to follow the outer circumferential surface 14A of the first tapered portion 14 of the jig body 11. As a result, the screw engagement portion body 22 moves so as to be guided by the first tapered portion 14 of the jig body 11.

[0046] As shown in Figure 7, when the first operating part 41 rotates in the first rotational direction R1, the screw engagement part 21 moves in the first direction D1. Also, when the first operating part 41 rotates in the opposite direction to the first rotational direction R1, the screw engagement part 21 moves in the opposite direction to the first direction D1.

[0047] [Protrusion and screw engagement stopper] As shown in Figure 5, the screw removal jig 1 further comprises a projection 24 and a screw engagement stopper 51. The screw engagement stopper 51 is provided on the jig body 11. Specifically, the screw engagement stopper 51 is configured to extend in the forward direction DZ1A from the end on the forward direction DZ1A side of the first operating part 41.

[0048] The screw engagement stopper 51 is cylindrical in shape. The central axis of the screw engagement stopper 51 coincides with the central axis Z1. A projection edge 52 is provided at the end 51A of the screw engagement stopper 51 on the positive direction DZ1A side. The projection edge 52 extends from the end 51A of the screw engagement stopper 51 toward the central axis Z1. The projection 24 is provided on the screw engagement body 22. Specifically, the projection 24 is provided on the outer circumferential surface 22B of the screw engagement body 22.

[0049] The projection 24 comes into contact with the screw engagement stopper 51 when the screw engagement portion 21 moves in a direction that increases the first longitudinal distance LD1, and the end 22C of the screw engagement portion body 22 on the negative direction DZ1B side reaches the vicinity of the first end 11A of the jig body 11.

[0050] Specifically, the projection 24 is configured to contact the negative-direction DZ1B side surface of the projection edge 52 of the screw engagement stopper 51 when the screw engagement portion 21 is positioned in a predetermined location by moving in the third direction D3. The contact of the projection 24 with the projection edge 52 of the screw engagement stopper 51 prevents the screw engagement portion 21 from moving toward the third direction D3.

[0051] [Driver fixing part] As shown in Figures 4 and 5, the screw removal jig 1 further comprises a plurality of screwdriver fixing parts 31.

[0052] As shown in Figure 6, the driver fixing portion 31 fixes the jig body 11 to the driver shaft portion 5. The driver fixing portion 31 is provided in the region of the jig body 11 on the side of the second end portion 11B. In this embodiment, the region of the jig body 11 on the side of the second end portion 11B is the region that includes the second tapered portion 15.

[0053] As shown in Figure 5, the driver fixing part 31 has a driver fixing part body 32 and a driver contact part 33. The driver fixing part body 32 is positioned outside the jig body 11. Specifically, the driver fixing part body 32 is positioned outside the second tapered part 15 of the jig body 11. The driver fixing part body 32 is configured to follow a line L2 that intersects the central axis of the jig body 11 at an angle. The line L2 extends at an angle so as it moves in the negative direction DZ1B it approaches the central axis 16Z and intersects the central axis 16Z of the insertion hole 16.

[0054] The cross-sectional shape of the driver fixing part body 32 is configured, for example, as a fan shape. The driver fixing part body 32 is positioned so that its inner circumferential surface 32A contacts the outer circumferential surface 15A of the second tapered portion 15 of the jig body 11.

[0055] The driver contact portion 33 is provided on the driver fixing portion body 32 so as to be positioned away from the second end portion 11B on the jig body 11. The driver contact portion 33 extends from the end portion 32C on the negative direction DZ1B side of the driver fixing portion body 32 toward the negative direction DZ1B. The cross-sectional shape of the driver contact portion 33 is configured to be, for example, a fan shape. The driver contact portion 33 has a friction surface 33A facing the central axis Z1. The friction surface 33A extends parallel to the central axis Z1. The friction surface 33A is configured to follow the outer circumferential surface of the driver shaft portion 5 of the driver 4. The friction surface 33A is where the driver contact portion 33 contacts the driver shaft portion 5.

[0056] As shown in Figure 6, the driver fixing portion 31 is provided on the jig body 11 such that the distance between the friction surface 33A of the driver contact portion 33 and the central axis changes as the driver fixing portion 31 moves relative to the jig body 11.

[0057] Specifically, the driver fixing portion 31 is positioned on the jig body 11 such that when the second vertical distance LD3 increases during the movement of the driver fixing portion 31 relative to the jig body 11, the fourth distance LD4 decreases. The second vertical distance LD3 is the distance between the friction surface 33A of the driver contact portion 33 and the second end portion 11B of the jig body 11. The fourth distance LD4 is the distance between the central axis 16Z of the insertion hole 16 and the friction surface 33A of the driver contact portion 33.

[0058] In short, the fourth distance LD4 is shortened by the movement of the driver fixing part 31 in the second direction D2 (see Figure 6). The second direction D2 is the direction in which the driver fixing part 31 moves in a direction that increases the distance between the friction surface 33A of the driver contact part 33 and the second end 11B of the insertion hole 16. The second direction D2 follows the line L2 described above.

[0059] In response to this, the driver fixing portion 31 moves in the opposite direction to the second direction D2, increasing the fourth distance LD4. At this time, the driver contact portion 33 moves away from the driver shaft portion 5.

[0060] [Second operation section] As shown in Figures 1, 2, 4, and 5-7, the screw removal jig 1 further comprises a second operating part 42. The second operating part 42 is a member that moves the screwdriver fixing part 31. The second operating part 42 is positioned outside the screwdriver fixing part body 32. The second operating part 42 is cylindrical in shape. The central axis of the second operating part 42 coincides with the central axis Z1.

[0061] The second operating section 42 has a second female thread 63. Specifically, the second operating section 42 has a second female thread 63 on its inner circumferential surface 42A. The driver fixing section body 32 has a second male thread 67 on its outer circumferential surface 32B. The second female thread 63 engages with the second male thread 67. As a result, the second operating section 42 engages with the driver fixing section body 32 via the second female thread 63 and the second male thread 67.

[0062] As shown in Figure 6, the driver fixing part 31 moves as the second operating part 42 rotates. Specifically, by rotating the second operating part 42, the driver fixing part body 32 moves so as to follow the outer circumferential surface 15A of the second tapered portion 15 of the jig body 11. As a result, the driver fixing part body 32 moves so as to be guided by the second tapered portion 15 of the jig body 11.

[0063] As shown in Figure 6, when the second operating part 42 rotates in the second rotation direction R2, the driver fixing part 31 moves in the second direction D2. Also, when the second operating part 42 rotates in the opposite direction to the second rotation direction R2, the driver fixing part 31 moves in the opposite direction to the second direction D2.

[0064] As shown in Figures 6 and 7, in this embodiment, the first rotation direction R1 of the first operating unit 41 and the second rotation direction R2 of the second operating unit 42 are the same direction of rotation. However, the first rotation direction R1 of the first operating unit 41 may be the opposite direction of rotation to the second rotation direction R2 of the second operating unit 42.

[0065] [Driver fixing part cover] As shown in Figures 4 to 7, a driver fixing part cover 53 is provided on the outside of the driver fixing part 31. The driver fixing part cover 53 is cylindrical in shape. The central axis of the driver fixing part cover 53 coincides with the central axis line Z1.

[0066] [Operation of the screw removal tool] The operation of the screw removal jig 1 will be described with reference to Figures 6 and 7. In this example, the operation of the screw removal jig 1 in removing a screw 7 attached to the base material 81 will be described.

[0067] As shown in Figure 6, first, the tip 23A of the screw contact portion 23 is brought close to the screw head 8 of the screw 7 to be removed. Then, by rotating the first operating portion 41, the screw engaging portion 21 is moved so that the tip 23A of the screw contact portion 23 of the screw engaging portion 21 is positioned between the lower surface of the screw head 8 and the base material 81.

[0068] Next, the driver shaft 5 of the screwdriver 4 is inserted through the insertion hole 16 of the jig body 11. Then, the cutting edge 6 of the driver shaft 5 is engaged with the recess 8A of the screw head 8.

[0069] Next, the driver fixing part 31 is moved in the second direction D2 by rotating the second operating part 42. The friction surface 33A of the driver contact part 33 makes contact, fixing the jig body 11 to the driver shaft part 5.

[0070] Then, as shown in Figure 7, the screw engagement portion 21 is moved in the first direction D1 by rotating the first operating portion 41. When the screw engagement portion 21 moves in the first direction D1, the radial distance LD2 is shortened, and the tip portion 23A of the screw contact portion 23 moves in the first direction D1. This improves the contact between the screw head 8 and the cutting edge 6 of the screwdriver 4.

[0071] In this state, the screwdriver 4 is rotated. As a result, the screw 7 rotates and emerges from the base material 81. Even while the screwdriver 4 is rotating, the screw removal jig 1 maintains close contact between the screw head 8 and the tip 6 of the screwdriver 4, so the engagement between the tip 6 of the screwdriver 4 and the screw head 8 does not easily loosen. Therefore, when removing the screw 7, the recess 8A of the screw head 8 is prevented from being crushed.

[0072] [Operation of this embodiment] The operation of this embodiment will now be explained. The screw removal jig 1 is attached to the screwdriver 4. The screw removal jig 1 comprises a jig body 11 and a plurality of screw engagement parts 21. The jig body 11 has an insertion hole 16 through which the screwdriver shaft 5 is inserted. The plurality of screw engagement parts 21 are provided on the jig body 11. The plurality of screw engagement parts 21 engage with the screw 7 to be removed. The screw engagement part 21 comprises a screw engagement part body 22 and a screw contact part 23. The screw engagement part body 22 is guided by the jig body 11. The screw contact part 23 is provided at the end of the screw engagement part body 22. The screw contact part 23 is provided on the screw engagement part body 22 so as to extend toward the central axis 16Z of the insertion hole 16. The tip of the screw engagement part 21 is pointed. The screw engagement portion 21 is provided on the jig body 11 such that the distance between the tip portion 23A of the screw contact portion 23 and the central axis changes as the screw engagement portion 21 moves in a direction inclined with respect to the central axis 16Z of the insertion hole 16 relative to the jig body 11.

[0073] In this way, the screw engagement portion 21 moves relative to the jig body 11 in a direction inclined with respect to the central axis 16Z of the insertion hole 16. As the screw engagement portion 21 moves, the distance between the tip portion 23A of the screw contact portion 23 and the central axis 16Z changes. This allows the screw engagement portion 21 to be positioned appropriately according to the shape of various screw heads 8. Then, as the screw engagement portion 21 moves in the third direction D3 opposite to the first direction D1 while engaged with the screw head 8, the cutting edge 6 of the driver shaft portion 5 of the driver 4 and the screw head 8 can be strongly engaged. That is, by increasing the contact between the screw head 8 and the cutting edge 6 of the driver 4, the gap between the cutting edge 6 of the driver 4 and the recess 8A of the screw head 8 is suppressed. Therefore, when removing the screw 7, crushing of the recess 8A of the screw head 8 can be suppressed.

[0074] [Effects of this embodiment] The effects of this embodiment will now be explained. (1) The screw removal jig 1, which can be attached to the screwdriver 4, comprises a jig body 11 and a plurality of screw engagement parts 21. The jig body 11 has an insertion hole 16 through which the screwdriver shaft 5 of the screwdriver 4 is inserted. The plurality of screw engagement parts 21 are provided on the jig body 11. The plurality of screw engagement parts 21 engage with the screw 7 to be removed. The screw engagement part 21 comprises a screw engagement part body 22 and a screw contact part 23. The screw engagement part body 22 is guided by the jig body 11. The screw contact part 23 extends from a portion of the screw engagement part body 22 away from the first end 11A of the jig body 11 toward the central axis 16Z of the insertion hole 16. The screw engagement portion 21 is provided on the jig body 11 such that the distance between the tip portion 23A of the screw contact portion 23 and the central axis changes as the screw engagement portion 21 moves in a direction inclined with respect to the central axis 16Z of the insertion hole 16 relative to the jig body 11.

[0075] In this configuration, the screw engagement portion 21 moves in a direction inclined with respect to the central axis 16Z. As a result, the screw engagement portion 21 is positioned appropriately according to the shape of the screw head 8 of various forms. This prevents the recess 8A of the screw head 8 from being crushed.

[0076] Specifically, in the screw removal jig 1, the screw engagement portion 21 moves in a direction inclined with respect to the central axis 16Z of the insertion hole 16 of the jig body 11, so that the screw contact portion 23 engages with the screw 7 to be removed and the tip 6 of the screwdriver 4 can be pressed against the screw head 8. This increases the contact between the screw head 8 and the tip 6 of the screwdriver 4, thereby reducing the risk of the tip 6 of the screwdriver 4 crushing the recess 8A of the screw head 8.

[0077] (2) In the screw removal jig 1 that can be attached to the driver 4, the screw engagement portion 21 is positioned on the jig body 11 such that when the first vertical distance LD1 is shortened during the movement of the screw engagement portion 21 relative to the jig body 11, the radial distance LD2 is shortened.

[0078] In this configuration, the radial distance LD2 of the screw removal jig 1 decreases as the first vertical distance LD1 decreases. Therefore, with the screw removal jig 1, the screw engagement portion 21 can pull the screw head 8 towards the jig body 11.

[0079] (3) The screw removal jig 1, which can be attached to the screwdriver 4, further comprises a first operating part 41 for moving the screw engagement part 21. The screw engagement part body 22 has a first male thread 65 on its outer peripheral surface 22B. The first operating part 41 is positioned outside the screw engagement part body 22 and has a first female thread 61 that engages with the first male thread 65. The screw engagement part 21 moves as the first operating part 41 rotates.

[0080] In this configuration, the screw engagement portion 21 moves in a direction inclined toward the central axis 16Z of the insertion hole 16 of the jig body 11 by rotating the first operating portion 41.

[0081] (4) The screw removal jig 1 that can be attached to the screwdriver 4 further includes a screwdriver fixing part 31 that fixes the jig body 11 to the screwdriver shaft 5. With this configuration, the jig body 11 can be fixed to the screwdriver shaft 5 by the screwdriver fixing part 31.

[0082] Furthermore, after fixing the tip 6 of the screwdriver 4 to the first end 11A of the jig body 11, the screw engagement portion 21 can be moved to press the tip 6 of the screwdriver 4 against the screw head 8. This improves the contact between the screw head 8 and the tip 6 of the screwdriver 4.

[0083] Furthermore, since the jig body 11 is fixed to the driver shaft 5, the screw removal jig 1 rotates together with the driver shaft 5. In other words, the screw 7 can be turned by the driver 4 while the screw head 8 and the cutting edge 6 of the driver 4 are in close contact.

[0084] (5) In the screw removal jig 1 that can be attached to the screwdriver 4, the jig body 11 has a second end 11B opposite to the first end 11A. The screwdriver fixing part 31 has a screwdriver fixing part body 32 that is guided by the jig body 11, and a screwdriver contact part 33 that is provided on the screwdriver fixing part 31 so as to be positioned away from the second end 11B on the jig body 11. The screwdriver fixing part 31 is provided on the jig body 11 such that the distance between the friction surface 33A of the screwdriver contact part 33 and the central axis changes as the screwdriver fixing part 31 moves relative to the jig body 11. With this configuration, the jig body 11 can be fixed to the screwdriver shaft part 5 by the friction surface 33A of the screwdriver contact part 33.

[0085] (6) In the screw removal jig 1 that can be attached to the screwdriver 4, the screwdriver fixing part 31 is positioned on the jig body 11 as follows when the screwdriver fixing part 31 moves relative to the jig body 11: The screwdriver fixing part 31 is positioned on the jig body 11 such that when the second vertical distance LD3 increases, the fourth distance LD4 decreases.

[0086] With this configuration, the jig body 11 can be fixed to the driver shaft 5 by moving the friction surface 33A diagonally with respect to the central axis 16Z of the insertion hole 16 of the jig body 11.

[0087] (7) The screw removal jig 1, which can be attached to the screwdriver 4, further comprises a second operating part 42 for moving the screwdriver fixing part 31. The screwdriver fixing part body 32 has a second female thread 63 on its outer peripheral surface 32B. The second operating part 42 is positioned outside the screwdriver fixing part body 32. The screwdriver fixing part body 32 has a second female thread 63 that engages with a second male thread 67. The screwdriver fixing part 31 moves as the second operating part 42 rotates. With this configuration, the jig body 11 can be fixed to the screwdriver shaft 5 by rotating the second operating part 42.

[0088] (8) In the screw removal jig 1 that can be attached to the screwdriver 4, when the first operating part 41 rotates in the first rotational direction R1, the screw engaging part 21 moves in the first direction D1. When the second operating part 42 rotates in the second rotational direction R2, the screwdriver fixing part 31 moves in the second direction D2. The first rotational direction R1 and the second rotational direction R2 are the same direction of rotation.

[0089] With this configuration, in the screw removal jig 1, the contact between the screw head 8 and the cutting edge 6 of the screwdriver 4 can be increased by rotating the first operating part 41 in the first rotational direction R1. Also, in the screw removal jig 1, the jig body 11 can be fixed to the screwdriver shaft 5 by rotating the second operating part 42 in the second rotational direction R2. The first rotational direction R1 is the same direction as the second rotational direction R2. That is, the rotational direction of the first operating part 41 when bringing the screw engaging part 21 closer to the screw 7 is the same as the rotational direction of the second operating part 42 when bringing the screw contact part 23 closer to the screwdriver shaft 5. In this way, since the operation of bringing the movable parts of the screw removal jig 1 closer is in the same direction for both the first operating part 41 and the second operating part 42, it is possible to suppress erroneous operation of the screw removal jig 1.

[0090] (9) In the screw removal jig 1 that can be attached to the screwdriver 4, when the first operating part 41 rotates in the first rotational direction R1, the screw engaging part 21 moves in the first direction D1. When the second operating part 42 rotates in the second rotational direction R2, the screwdriver fixing part 31 moves in the second direction D2. The first rotational direction R1 may be configured to be the opposite rotational direction to the second rotational direction R2.

[0091] With this configuration, in the screw removal jig 1, rotating the first operating part 41 in the first rotational direction R1 increases the contact between the screw head 8 and the cutting edge 6 of the screwdriver 4. Also, in the screw removal jig 1, rotating the second operating part 42 in the second rotational direction R2 allows the jig body 11 to be fixed to the screwdriver shaft 5. The first rotational direction R1 is opposite to the second rotational direction R2. Therefore, by gripping the first operating part 41 and the second operating part 42 with both hands and twisting them, the contact between the screw head 8 and the cutting edge 6 of the screwdriver 4 can be increased and the screwdriver 4 can be fixed in place.

[0092] (10) The screw removal jig 1, which can be attached to the screwdriver 4, further comprises a projection 24 provided on the screw engagement part body 22 and a screw engagement part stopper 51 provided on the jig body 11. The projection 24 contacts the screw engagement part stopper 51 when the end 22C of the screw engagement part body 22 reaches the vicinity of the first end 11A of the jig body 11 as the screw engagement part 21 moves in a direction that increases the first vertical distance LD1. With this configuration, it is possible to prevent the screw engagement part 21 from detaching from the jig body 11.

[0093] <Second Embodiment> The screw removal attachment 3 according to the second embodiment will be described with reference to Figures 8 to 11. In this embodiment, components common to the first embodiment are denoted by the same reference numerals as in the first embodiment, and the description of redundant components is omitted.

[0094] The screw removal attachment 3 is detachably mounted on the output shaft of the power tool. The output shaft of the power tool is rotated by a motor. The output shaft of the power tool provides rotational power to the screw removal attachment 3.

[0095] As shown in Figure 8, the screw removal attachment 3 comprises an attachment body portion 71, a driver shaft portion 5, and a screw engagement structure portion 74. The screw removal attachment 3 has a central axis Z2.

[0096] [Attachment main body] The attachment body 71 is detachably attached to the output shaft of the power tool. The attachment body 71 has a base 72 and a tool connection part 73. The central axis of the base 72 coincides with the central axis line Z2.

[0097] As shown in Figures 9 and 11, the tool connector 73 is provided on the second surface 72B of the base 72 of the attachment body 71, opposite to the first surface 72A. The tool connector 73 is positioned perpendicular to the second surface 72B. The central axis of the tool connector 73 coincides with the central axis Z2. The tool connector 73 is configured to connect to the output shaft of the power tool so as not to rotate relative to the output shaft. The screw removal attachment 3 is detachably attached to the output shaft of the power tool by the tool connector 73.

[0098] As shown in Figure 11, the driver shaft portion 5 is provided on the attachment body portion 71. The driver shaft portion 5 is provided on the first surface 72A of the base portion 72 of the attachment body portion 71. The driver shaft portion 5 is inserted through the insertion hole 17 of the jig body 12. The driver shaft portion 5 is provided so as to be perpendicular to the first surface 72A. The central axis of the driver shaft portion 5 coincides with the central axis line Z2.

[0099] [Screw engagement structure] As shown in Figures 9 and 11, the screw engagement structure 74 is provided on the attachment body 71. Specifically, the screw engagement structure 74 is provided on the first surface 72A of the base 72 of the attachment body 71.

[0100] As shown in Figure 11, the screw engagement structure 74 comprises a jig body 12, a plurality of screw engagement parts 21 that engage with the screw 7 to be removed, and a first operating part 41.

[0101] The jig body 12 has an insertion hole 17 through which the driver shaft 5 is inserted. The central axis 17Z of the insertion hole 17 coincides with the central axis line Z2.

[0102] The screw engagement portion 21 has the same structure as in the first embodiment. Specifically, the screw engagement portion 21 includes a screw engagement portion body 22 guided by the jig body 12 and a screw contact portion 23 provided on the screw engagement portion body 22. The screw engagement portion 21 is provided in the region of the jig body 12 on the first end 12A side. In this embodiment, the region of the jig body 12 on the first end 12A side is the region including the first tapered portion 14.

[0103] As shown in Figures 10 and 11, the screw contact portion 23 extends from a portion of the screw engagement portion body 22 away from the first end portion 12A of the jig body 12 toward the central axis 17Z of the insertion hole 17. The screw engagement portion 21 is provided on the jig body 12 such that the distance between the tip portion 23A of the screw contact portion 23 and the central axis 17Z of the insertion hole 17 changes as the screw engagement portion 21 moves relative to the jig body 12 in a direction inclined toward the central axis 17Z of the insertion hole 17.

[0104] The first operating unit 41 moves the screw engagement portion 21. The first operating unit 41 is positioned outside the screw engagement portion body 22.

[0105] Thus, the screw engagement structure 74 has substantially the same structure as the first tapered portion 14, the screw engagement portion 21, and the first operating portion 41 in the first embodiment.

[0106] The screw removal attachment 3 further includes a screw engagement stopper 51 and a projection 24 provided on the screw engagement portion 21. In this respect as well, it is substantially the same as the first embodiment.

[0107] [Effects of this embodiment] The effects of this embodiment will now be explained. The screw removal attachment 3 comprises an attachment body 71, a driver shaft 5, and a screw engagement structure 74. The attachment body 71 is detachably attached to the output shaft of a power tool. The driver shaft 5 is provided on the attachment body 71. The screw engagement structure 74 is provided on the attachment body 71. The screw engagement structure 74 comprises a jig body 12 and a plurality of screw engagement parts 21 that engage with the screw 7 to be removed. The jig body 12 has the same structure as the jig body 11 of the first embodiment. The screw engagement parts 21 have the same structure as the screw engagement parts 21 of the first embodiment. With this configuration, the screw removal attachment 3 can be attached to a power tool to perform the operation of removing the screw 7.

[0108] <Variation> The above embodiments are illustrative of possible forms of the screw removal jig 1 and screw removal attachment 3, and are not intended to limit their forms. The screw removal jig 1 and screw removal attachment 3 may take forms different from those illustrated in the above embodiments. Examples include forms in which some of the configurations of the embodiments are replaced, modified, or omitted, or forms in which new configurations are added to the embodiments. Modifications of the embodiments are shown below.

[0109] The number of screw engagement portions 21 is not particularly limited. In each embodiment, the screw removal jig 1 and the screw removal attachment 3 have three screw engagement portions 21. In contrast, the screw removal jig 1 and the screw removal attachment 3 may have two or more screw engagement portions 21.

[0110] The number of screwdriver fixing parts 31 is not particularly limited. In the first embodiment, the screw removal jig 1 has three screwdriver fixing parts 31. In contrast, the screw removal jig 1 may have two or more screwdriver fixing parts 31.

[0111] The structure of the driver fixing part 31 is not limited to this embodiment. For example, the driver fixing part 31 may have a bolt fastening structure.

[0112] In the screw removal attachment 3, the driver shaft portion 5 may be detachably provided on the base portion 72.

[0113] This specification discloses the following technologies: [Note 1] Appendix 1 relates to a screw removal jig that can be attached to a screwdriver. The screw removal jig comprises a jig body and a plurality of screw engagement parts. The jig body has an insertion hole through which the screwdriver shaft of the screwdriver is inserted. The plurality of screw engagement parts are provided on the jig body and engage with a screw to be removed. The screw engagement part comprises a screw engagement part body guided by the jig body and a screw contact part that extends from a portion of the screw engagement part body away from the first end of the jig body toward the central axis of the insertion hole. The screw engagement part is provided on the jig body such that the distance between the tip of the screw contact part and the central axis changes as the screw engagement part moves in a direction inclined with respect to the jig body toward the central axis of the insertion hole.

[0114] [Note 2] In the screw removal jig described in Appendix 1, the screw engaging portion is positioned on the jig body such that, as the screw engaging portion moves relative to the jig body, the distance between the central axis of the insertion hole and the tip of the screw contact portion decreases when the distance between the tip of the screw contact portion and the first end of the jig body decreases.

[0115] [Note 3] The screw removal jig described in Appendix 2 further comprises a first operating part for moving the screw engagement portion. The screw engagement portion body has a first male thread on its outer circumferential surface. The first operating part is positioned outside the screw engagement portion body. The first operating part has a first female thread that engages with the first male thread. The screw engagement portion moves as the first operating part rotates.

[0116] [Note 4] The screw removal jig described in Appendix 3 further comprises a plurality of screwdriver fixing parts for fixing the jig body to the screwdriver shaft.

[0117] [Note 5] In the screw removal jig described in Appendix 4, the jig body has a second end opposite to the first end. The screwdriver fixing portion has a screwdriver fixing portion body guided by the jig body, and a screwdriver contact portion provided on the screwdriver fixing portion body so as to be positioned away from the second end on the jig body. The screwdriver fixing portion is provided on the jig body such that the distance between the friction surface of the screwdriver contact portion and the central axis changes as the screwdriver fixing portion moves relative to the jig body.

[0118] [Note 6] In the screw removal jig described in Appendix 5, the screwdriver fixing portion is positioned on the jig body such that, when the screwdriver fixing portion moves relative to the jig body, the distance between the central axis of the insertion hole and the friction surface of the screwdriver contact portion becomes shorter as the distance between the friction surface of the screwdriver contact portion and the second end of the jig body increases.

[0119] [Note 7] The screw removal jig described in Appendix 6 further comprises a second operating part for moving the screwdriver fixing part. The screwdriver fixing part body has a second male screw on its outer circumferential surface. The second operating part is positioned outside the screwdriver fixing part body. The second operating part has a second female screw that engages with the second male screw. The screwdriver fixing part moves as the second operating part rotates.

[0120] [Note 8] In the screw removal jig described in Appendix 7, when the first operating part rotates in the first rotational direction, the screw engaging part moves in the first direction. When the second operating part rotates in the second rotational direction, the screwdriver fixing part moves in the second direction. The first direction is the direction in which the screw engaging part moves in a direction that shortens the distance between the tip of the screw contact part and the first end of the jig body. The second direction is the direction in which the screwdriver fixing part moves in a direction that lengthens the distance between the friction surface of the screwdriver contact part and the second end of the insertion hole. The first rotational direction and the second rotational direction are the same rotational direction.

[0121] [Note 9] In the screw removal jig described in Appendix 7, when the first operating part rotates in the first rotational direction, the screw engagement part moves in the first direction. When the second operating part rotates in the second rotational direction, the driver fixing part moves in the second direction. The first direction is the direction in which the screw engagement moves in a direction that shortens the distance between the tip of the screw contact part and the first end of the jig body. The second direction is the direction in which the driver fixing part moves in a direction that lengthens the distance between the friction surface of the driver contact part and the second end of the insertion hole. The first rotational direction is the rotational direction opposite to the second rotational direction.

[0122] [Note 10] The screw removal jig described in Appendix 1 further comprises a projection provided on the screw engagement portion body and a screw engagement portion stopper provided on the jig body. The projection contacts the screw engagement portion stopper when the end of the screw engagement portion body reaches the vicinity of the first end of the jig body as the screw engagement portion moves in a direction that increases the distance between the tip of the screw contact portion and the first end of the jig body.

[0123] [Note 11] Appendix 10 describes a technology relating to a screw removal attachment. The screw removal attachment is attached to a power tool. The screw removal attachment comprises an attachment body that is detachably attached to the output shaft of the power tool, a driver shaft portion provided on the attachment body, and a screw engagement structure portion provided on the attachment body. The screw engagement structure portion comprises a jig body having an insertion hole through which the driver shaft portion is inserted, and a plurality of screw engagement portions provided on the jig body that engage with a screw to be removed. The screw engagement portion has a screw engagement portion body guided by the jig body, and a screw contact portion extending from a portion of the screw engagement portion body away from the first end of the jig body toward the central axis of the insertion hole, and is provided on the jig body such that the distance between the tip of the screw contact portion and the central axis changes as the screw engagement portion moves in a direction inclined with respect to the central axis of the insertion hole with respect to the jig body. [Explanation of symbols]

[0124] D1...First direction, D2...Second direction, R1...First rotation direction, R2...Second rotation direction, 1...Screw removal jig, 3...Screw removal attachment, 4...Screwdriver, 5...Screwdriver shaft, 7...Screw, 11...Jig body, 11A...First end, 11B...Second end, 16...Through hole, 21...Screw engagement part, 22...Screw engagement part body, 22B...Outer surface of screw engagement part body, 22C...End of screw engagement part body, 23...Screw contact part, 23A...Tip part, 24...Protrusion part, 31...Driver fixing part, 32...Driver fixing part body, 32B...Outer circumference, 33...Driver contact part, 33A...Friction surface, 41...First operating part, 42...Second operating part, 51...Screw engagement part stopper, 61...First female thread, 63...Second female thread, 65...First male thread, 67...Second male thread, 71...Attachment body part, 74...Screw engagement structure part.

Claims

1. A screw removal tool that can be attached to a screwdriver, A jig body having an insertion hole through which the driver shaft of the aforementioned driver is inserted, The jig body is provided with a plurality of screw engagement parts that engage with the screw to be removed, The screw engagement portion is, The screw engagement portion body is guided by the jig body, and the screw contact portion of the screw engagement portion body extends toward the central axis of the insertion hole from a portion away from the first end of the jig body, Furthermore, the jig body is provided such that the distance between the tip of the screw contact portion and the central axis changes as the screw engagement portion moves in a direction inclined with respect to the central axis of the insertion hole relative to the jig body, Screw removal jig.

2. The screw engagement portion is positioned on the jig body such that, as the screw engagement portion moves relative to the jig body, the distance between the tip of the screw contact portion and the first end of the jig body decreases, and the distance between the central axis of the insertion hole and the tip of the screw contact portion decreases. The screw removal jig according to claim 1.

3. The system further includes a first operating part for moving the aforementioned screw engagement portion, The screw engagement portion body has a first male thread on its outer circumferential surface, The first operating portion is positioned outside the main body of the screw engagement portion and has a first female thread that engages with the first male thread. The screw engagement portion moves as the first operating portion rotates. The screw removal jig according to claim 2.

4. The jig body further comprises a plurality of driver fixing parts for fixing the driver shaft portion. The screw removal jig according to claim 3.

5. The jig body has a second end opposite to the first end, The aforementioned driver fixing part is The jig body includes a driver fixing part body guided by the jig body, and a driver contact part provided on the driver fixing part body so as to be positioned away from the second end on the jig body. Furthermore, the jig body is provided such that the distance between the friction surface of the driver contact portion and the central axis changes as the driver fixing portion moves relative to the jig body, The screw removal jig according to claim 4.

6. The driver fixing portion is positioned on the jig body such that, when the driver fixing portion moves relative to the jig body, the distance between the friction surface of the driver contact portion and the second end of the jig body increases, and the distance between the central axis of the insertion hole and the friction surface of the driver contact portion decreases. The screw removal jig according to claim 5.

7. The system further includes a second operating unit for moving the aforementioned driver fixing unit, The driver fixing part body has a second male screw on its outer circumferential surface. The second operating section is positioned outside the driver fixing section body and has a second female thread that engages with the second male thread. The driver fixing part moves as the second operating part rotates. The screw removal jig according to claim 6.

8. When the first operating part rotates in the first rotational direction, the screw engaging part moves in the first direction. When the second operating part rotates in the second rotational direction, the driver fixing part moves in the second direction. The first direction is a direction in which the screw engagement portion is moved in a direction that shortens the distance between the tip of the screw contact portion and the first end of the jig body. The second direction is a direction in which the driver fixing portion is moved in a direction that increases the distance between the friction surface of the driver contact portion and the second end of the insertion hole. The first rotational direction and the second rotational direction are the same rotational direction. The screw removal jig according to claim 7.

9. When the first operating part rotates in the first rotational direction, the screw engaging part moves in the first direction. When the second operating part rotates in the second rotational direction, the driver fixing part moves in the second direction. The first direction is a direction in which the screw engagement portion is moved in a direction that shortens the distance between the tip of the screw contact portion and the first end of the jig body. The second direction is a direction in which the driver fixing portion is moved in a direction that increases the distance between the friction surface of the driver contact portion and the second end of the insertion hole. The first rotational direction is the opposite direction of rotation to the second rotational direction. The screw removal jig according to claim 7.

10. The tool further comprises a projection provided on the screw engagement part body and a screw engagement part stopper provided on the jig body, The projection contacts the screw engagement stopper when the end of the screw engagement body reaches the vicinity of the first end of the jig body as the screw engagement portion moves in a direction that increases the distance between the tip of the screw contact portion and the first end of the jig body. The screw removal jig according to claim 1.

11. A screw removal attachment that can be attached to a power tool, An attachment body that can be detachably attached to the output shaft of a power tool, The driver shaft portion provided on the attachment body, The attachment body is provided with a screw engagement structure, The screw engagement structure is, A jig body having an insertion hole through which the driver shaft is inserted, The jig body is provided with a plurality of screw engagement parts that engage with the screw to be removed, The screw engagement portion is, The screw engagement portion body is guided by the jig body, and the screw contact portion of the screw engagement portion body extends toward the central axis of the insertion hole from a portion away from the first end of the jig body, Furthermore, the jig body is provided such that the distance between the tip of the screw contact portion and the central axis changes as the screw engagement portion moves in a direction inclined with respect to the central axis of the insertion hole relative to the jig body, Screw removal attachment.

Images