Base material protection jig and base material fastening method

Abstract

To provide a base material protection jig and a base material fastening method that can improve versatility and workability while suppressing damage to the base material. [Solution] The base material protection jig 1 is used when fastening a bolt B to a base material P with a rotary tool T, is removable from the socket S, and is a jig for protecting the surface Pa of the base material P. The base material protection jig 1 comprises a first base member 2 positioned on the surface Pa of the base material P and provided to surround the bolt B, a second base member 3 positioned between the socket S and the first base member 2 and rotatable relative to the first base member 2, and a holding member 4 that holds the first base member 2 and the second base member 3 by magnetic force. The holding member 4 holds the second base member 3 rotatably relative to the first base member 2 when the second base member 3 rotates together with the socket S.

Description

Technical Field

[0001] The present invention relates to a base material protection jig and a base material fastening method, and particularly to a base material protection jig used when fastening a fastening member to a base material by a rotary tool, and a base material fastening method using the base material protection jig.

Background Art

[0002] Generally, when fastening a fastening member such as a bolt to a base material using a rotary tool such as an impact wrench, the tip of the rotary tool is rotated while engaged with the fastening member to fasten the fastening member to the base material. Specifically, an operator rotates the socket of the impact wrench while the socket is engaged with the bolt head to fasten the fastening member to the base material. However, since the fastening operation is performed while pressing the socket of the impact wrench against the base material, the tip surface of the socket contacts the base material when the socket is rotated. Therefore, there is a risk that the base material may be rubbed and damaged by the rotation of the socket.

[0003] Here, in Patent Document 1, it is proposed to suppress damage to the base material by the sliding of the tip portion of the socket for an impact wrench with respect to the socket body. Specifically, the portion of the socket that contacts the base material is fixed to the outer peripheral surface of the socket body via a bearing.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the impact wrench socket described in Patent Document 1, the tip portion is in a non-removable attachment to the socket body. Specifically, the tip portion that contacts the base material and the socket body that engages with the bolt head and rotates are integrated into a single unit. Therefore, it was necessary to prepare multiple dedicated sockets according to the size and shape of the fastening members. On the other hand, even if each component of the socket were made detachable, it may become difficult to carry when the components are separated.

[0006] The object of the present invention is to provide a base material protection jig and a base material fastening method that can improve versatility and workability while suppressing damage to the base material. [Means for solving the problem]

[0007] The aforementioned problems are solved by the base material protection jig of the present invention, which is used when fastening a fastening member to a base material with a rotary tool, is removable from the tip of the rotary tool, and protects the surface of the base material, comprising: a first base member disposed on the surface of the base material and provided so as to surround the fastening member; a second base member disposed between the tip of the rotary tool and the first base member and rotatable relative to the first base member; and a holding member that holds the first base member and the second base member by magnetic force, wherein the holding member holds the second base member rotatably relative to the first base member when the second base member rotates together with the tip of the rotary tool.

[0008] With the above configuration, the base material protection jig can be detached from the tip of the rotary tool (specifically the socket) that engages with the bolt head and rotates, allowing it to be used with sockets of various sizes and types. Furthermore, even when the base material protection jig is detached from the socket, the first and second base members are held in place by magnetic force, making the base material protection jig easier to carry and improving work efficiency. Therefore, it is possible to improve versatility and workability while suppressing damage to the base material.

[0009] In this case, the holding member is provided on the second base member, and the base material protection jig is preferably detachably attached to the tip of the rotating tool by the magnetic force of the holding member. With the above configuration, the holding member is provided on the second base member on the rotating tool side, allowing the second base member and the first base member to be held by magnetic force, while the second base member can be attached to the rotating tool by magnetic force. Therefore, it can be attached to the rotating tool with a simple configuration.

[0010] In this case, the second base member has a ring shape that covers the periphery of the fastening member, and a plurality of the retaining members are provided on the outer circumferential surface of the second base member, and the plurality of retaining members are preferably arranged radially when viewed from the fastening direction of the fastening member. With the above configuration, the holding members are arranged radially, allowing the second base member to be stably attached to the rotary tool by magnetic force. Therefore, even when the tip of the rotary tool rotates, the risk of the base material protection jig unexpectedly falling off the rotary tool can be suppressed.

[0011] In this case, the holding member includes a first holding member provided on the first base member and detachably attaching the first base member to the surface of the base material by magnetic force, and a second holding member provided on the second base member and detachably attaching the second base member to the tip of the rotary tool by magnetic force, wherein the magnetic force of the second holding member is greater than that of the first holding member. With the above configuration, the second retaining member is provided on the second base member on the rotating tool side, allowing the second base member to be attached to the rotating tool by magnetic force. Furthermore, the first retaining member is provided on the first base member on the base material side, allowing the first base member to be attached to the base material by magnetic force. In addition, since the magnetic force of the second retaining member is greater than that of the first retaining member, the base material protection jig can be removed from the base material while it remains attached to the rotating tool.

[0012] In this case, the holding member is arranged in a plurality between the first base member and the second base member and has magnetic rolling elements and a receiving portion for receiving the rolling elements, and the rolling elements are preferably arranged so as to rotate the second base member relative to the first base member when the second base member rotates together with the tip of the rotary tool. With the above configuration, the rolling elements that facilitate the sliding of the second base member relative to the first base member are themselves magnetic, allowing the first and second base members to be held magnetically with a simple configuration. Furthermore, since the holding members do not protrude from the outer edges of the first and second base members, the base material protection jig can be made compact.

[0013] In this case, the holding member comprises a plurality of rolling elements arranged between the first base member and the second base member, and a receiving portion having magnetic force and receiving the rolling elements, wherein the receiving portion rotatably holds the second base member relative to the first base member when the second base member rotates together with the tip of the rotary tool. With the above configuration, the receiving portion that facilitates the sliding of the second base member relative to the first base member itself possesses magnetic force, allowing the first and second base members to be held magnetically with a simple configuration. Furthermore, since the holding member does not protrude from the outer edges of the first and second base members, the base material protection jig can be made compact.

[0014] Furthermore, the above problem is solved by a base material fastening method in which a fastening member is fastened to a base material by a rotary tool using a base material protection jig for protecting the surface of the base material, the method comprising: a positioning step of positioning the base material protection jig between the tip of the rotary tool and the base material; a fastening step of rotating the tip of the rotary tool to fasten the fastening member to the base material; and a jig removal step of removing the base material protection jig from the tip of the rotary tool, wherein in the positioning step, a second base member is positioned on the tip of the rotary tool and a first base member is positioned on the surface of the base material, and in the fastening step, the first base member and the second base member are held by magnetic force and the tip of the rotary tool is rotated to fasten the fastening member to the base material. As described above, the base material protection jig can be detached from the tip of the rotary tool (specifically the socket) that engages with the bolt head and rotates, allowing it to be used with sockets of various sizes and types. Furthermore, even when the base material protection jig is detached from the socket, the first and second base members are held in place by magnetic force, making the base material protection jig easier to carry and improving work efficiency. Therefore, it is possible to improve versatility and workability while suppressing damage to the base material. [Effects of the Invention]

[0015] According to the base material protection jig and base material fastening method of the present invention, it is possible to improve versatility and workability while suppressing damage to the base material. [Brief explanation of the drawing]

[0016] [Figure 1] This is an overall side view showing the base material protection jig of the first embodiment being placed on the base material and the fastening member being fastened with a rotary tool. [Figure 2] This is a cross-sectional view of the base material protection jig placed on the base material. [Figure 3] This is a perspective view of a base material protection jig. [Figure 4] This is an exploded perspective view of the base material protection jig. [Figure 5] This is a process diagram for the base material fastening method. [Figure 6] Cross-sectional view when the base material protection jig of the second embodiment is arranged on the base material. [Figure 7] Cross-sectional view when the base material protection jig of the third embodiment is arranged on the base material.

Embodiments for Carrying out the Invention

[0017] Hereinafter, based on FIGS. 1 to 7, the base material protection jig 1 of an embodiment of the present invention (hereinafter, this embodiment) will be described. In this embodiment, as shown in FIG. 1, the direction in which the fastening member (bolt B and nut N) is fastened to the base material P coincides with the vertical direction. However, the fastening direction is not limited to the vertical direction, and may be, for example, the horizontal direction.

[0018] <First Embodiment> As shown in FIG. 1, the base material protection jig 1 is a jig used for fastening a fastening member to the base material P by a rotary tool T and protecting the surface Pa of the base material P. The base material protection jig 1 is disposed between the base material P and the tip of the rotary tool T (specifically, the socket S). Since the base material protection jig 1 is disposed between the base material P and the socket S, it is possible to suppress the surface Pa of the base material P from being rubbed by the rotation of the socket S during fastening.

[0019] The fastening member is, for example, a bolt B or a nut N, and is tightened or loosened by a rotary tool T. The base material P is a plate member made of metal or resin, etc., and a bolt hole Pb for inserting the bolt B is formed. For example, when fastening two base materials P by overlapping them in the fastening direction (the vertical direction in this embodiment) and fastening them with a fastening member, the bolt B is inserted into the bolt hole Pb of each base material P, and the nut N is screwed onto the bolt B. Then, by rotating the bolt B with the rotary tool T around the fastening direction as the axis, the two base materials P can be fastened. Note that the base material P is not limited to a plate member, and may be a structure such as the floor or wall of a building as long as it can be fastened with a fastening member.

[0020] The rotary tool T is, for example, an impact wrench, and a socket S that surrounds the bolt head Ba is detachably attached to the tip of the tool body. The socket S is a metal attachment that can be attached to the tool body, and multiple sockets are provided to match the shape of the bolt head Ba. The socket S is made of a magnetic material, such as iron. As shown in Figure 2, the socket S has an engagement hole Sa that engages with the bolt head Ba. The engagement hole Sa is, for example, a dodecagonal or hexagonal hole.

[0021] In this embodiment, an example is shown in which the bolt B is rotated relative to the base material P to fasten the base material P together with the nut N, but this is not limited to this. For example, the nut N may be rotated to fasten it, or a fastening member such as a screw may be rotated to fasten it. Also, although the rotary tool T is exemplified as an electric impact wrench, it may be any other electric tool or a manual tool. Furthermore, the base material protection jig 1 may be used not only when tightening the fastening member with the rotary tool T, but also when loosening the fastening member with the rotary tool T.

[0022] As shown in Figure 3, the base material protection jig 1 is removable from the tip of the rotary tool T. More specifically, the base material protection jig 1 is detachably attached to the tip surface Sb of the socket S by magnetic force. Thus, since the base material protection jig 1 is removable from the socket S that engages with and rotates with the bolt head Ba, it can be used with sockets S of various sizes and types.

[0023] As shown in Figures 2 to 4, the base material protection jig 1 comprises a first base member 2 positioned on the surface Pa of the base material P, a second base member 3 positioned between the tip of the rotary tool T and the first base member 2 and rotatable relative to the first base member 2, a holding member 4 that holds the first base member 2 and the second base member 3 by magnetic force, and a sliding member 5 for smoothly sliding the second base member 3 relative to the first base member 2. The second base member 3 rotates relative to the first base member 2 via the sliding member 5 on an axis extending in the fastening direction (up and down in this embodiment). The base material protection jig 1 is detachably attached to the tip of the rotary tool T by the magnetic force of the holding member 4.

[0024] As shown in Figures 2 to 4, the first base member 2 is a metal member having an annular shape and is a magnetic material made of, for example, iron. A first through hole 2a for inserting a bolt B is formed in the central part of the first base member 2. In addition, a circular first sliding groove 2b is formed on the upper surface of the first base member 2 (i.e., the surface on the second base member 3 and sliding member 5 side) for rolling the rolling element 5a of the sliding member 5, which will be described later.

[0025] As shown in Figure 2, the first base member 2 has a ring shape that surrounds the fastening member and is provided on the surface Pa of the base material P so as to enclose the fastening member. Specifically, the first base member 2 is positioned to surround the lower end of the bolt head Ba. The thickness of the first base member 2 is formed to be smaller than the height of the bolt head Ba.

[0026] As shown in Figures 2 to 4, the second base member 3 is a ring-shaped metal member made of a magnetic material such as iron. A second through hole 3a for inserting a bolt B is formed in the central part of the second base member 3. A circular second sliding groove 3b for rolling the rolling element 5a of the sliding member 5 is formed on the lower surface of the second base member 3 (i.e., the surface on the first base member 2 and sliding member 5 side). A recess 3c for attaching the retaining member 4 is formed on the outer circumferential surface of the second base member 3.

[0027] As shown in Figure 2, the second base member 3 has a ring shape that covers the periphery of the fastening member and is positioned at the tip of the rotary tool T. Specifically, the second base member 3 is positioned to cover the periphery of the upper portion of the bolt head Ba. The second base member 3 is formed to be approximately the same thickness as the first base member 2. The second base member 3 rotates together with the socket S around an axis that extends in the fastening direction relative to the first base member 2 via the sliding member 5. In other words, when the socket S rotates, the second base member 3 rotates around an axis that passes through the center points of the first base member 2, the second base member 3, and the sliding member 5.

[0028] As shown in Figures 2 to 4, the holding member 4 is a magnetic member, such as a permanent magnet. When the second base member 3 rotates together with the tip of the rotary tool T, the holding member 4 holds the second base member 3 rotatably relative to the first base member 2. More specifically, when using the rotary tool T, the holding member 4 magnetically attracts the first base member 2, which is made of magnetic material, via the sliding member 5, and holds the second base member 3, which extends in the fastening direction, so as not to shift its axis of rotation. The first base member 2 is entirely made of magnetic material, but it may also be made of magnetic material in part.

[0029] In this way, the first base member 2 and the second base member 3 are detachably integrated by magnetic force, making them easy to carry and improving work efficiency. Furthermore, even if a part of the base material protection jig 1 is damaged, the part can be easily replaced.

[0030] Furthermore, the base material protection jig 1 is detachably attached to the tip of the rotary tool T by the magnetic force of the holding member 4. More specifically, the holding member 4 attracts the tip surface Sb of the magnetic socket S by magnetic force. In other words, one holding member 4 holds both the first base member 2 and the socket S by magnetic force. In particular, by providing the holding member 4 on the outer circumferential surface of the second base member 3, it is possible to hold both the first base member 2 and the socket S with a constant magnetic force while configuring the magnetic force to be such that the second base member 3 can rotate relative to the first base member 2.

[0031] In this way, when using the rotary tool T, the base material protection jig 1 can be easily attached to the socket S. When not using the rotary tool T, the base material protection jig 1 can be easily removed from the socket S. Furthermore, the base material protection jig 1 only needs to be separate from the rotating tool T, and may not be attached to the rotating tool T at all. Even in this case, the base material protection jig 1 can prevent the surface Pa of the base material P from being rubbed by the rotation of the tip surface Sb of the socket S.

[0032] Multiple retaining members 4 are provided on the outer circumferential surface of the second base member 3. Specifically, the retaining members 4 are eight cylindrical permanent magnets, each embedded in one of eight recesses 3c formed on the outer circumferential surface of the second base member 3. The retaining members 4 are fixed to the recesses 3c with adhesive, but are not limited to this; they may also be welded or fixed by fitting. By embedding the retaining members 4 in the recesses 3c, the retaining members 4 can be firmly attached to the second base member 3. The retaining member 4 is provided so as to protrude from the recess 3c, but it may also be provided so as to be completely embedded inside the second base member 3. Alternatively, the retaining member 4 may be attached directly to the outer circumferential surface of the second base member 3 without forming the recess 3c.

[0033] The multiple retaining members 4 are arranged radially when viewed from the fastening direction of the fastening member. Specifically, the eight retaining members 4 are provided at equal intervals radially when viewed from above. The radial arrangement of the retaining members 4 allows the second base member 3 to be stably attached to the rotating tool T by magnetic force. Therefore, even when the socket S rotates, it is possible to prevent the base material protection jig 1 from unexpectedly falling off the rotating tool T. The number, position, and shape of the holding members 4 are not limited to these; any configuration that allows the first base member 2 and the second base member 3 to be held in a relative rotatable manner by magnetic force is acceptable.

[0034] As shown in Figures 3 and 4, the sliding member 5 is positioned between the first base member 2 and the second base member 3, and smoothly rotates the second base member 3 relative to the first base member 2. The sliding member 5 is, for example, a ball bearing structure and has a plurality of rolling elements 5a positioned between the first base member 2 and the second base member 3, and a receiving portion 5b that receives the rolling elements 5a.

[0035] The rolling element 5a is, for example, a metal ball. The rolling element 5a is rotatably held with respect to the receiving portion 5b and is positioned to be sandwiched between the first sliding groove 2b of the first base member 2 and the second sliding groove 3b of the second base member 3.

[0036] The receiving portion 5b is, for example, a metal member having an annular shape. A receiving portion through hole 5c for inserting a bolt B is formed in the central part of the receiving portion 5b. As shown in Figure 2, the receiving portion 5b has a ring shape that covers the periphery of the fastening member and is positioned between the first base member 2 and the second base member 3. Specifically, the receiving portion 5b is positioned to cover the lower portion of the bolt head Ba. The receiving portion 5b is formed to be thinner than the first base member 2 and the second base member 3.

[0037] When the first base member 2, the second base member 3, and the sliding member 5 are stacked in the fastening direction (up and down in this embodiment), the thickness of the base material protection jig 1 is formed to be smaller than the height of the bolt head Ba. By reducing the thickness of the base material protection jig 1 in this way, the upper end of the bolt head Ba can engage with the engagement hole Sa of the socket S.

[0038] If the base material protection jig 1 is not used, the tip surface Sb of the socket S will come into contact with the surface Pa of the base material P. As a result, when the socket S rotates, the surface Pa of the base material P may be rubbed by the socket S, potentially damaging the base material P. In particular, if the base material P is made of iron, for example, scratches on the surface Pa may cause corrosion of the base material P starting from the scratched area. However, as in this embodiment, by positioning the base material protection jig 1 between the base material P and the socket S, even if the second base member 3 rotates together with the socket S when it rotates, the second base member 3 rotates relative to the first base member 2 via the sliding member 5, so the first base member 2 does not rotate. Therefore, friction on the base material P when the socket S rotates can be suppressed.

[0039] The second base member 3 rotates smoothly relative to the first base member 2 via the sliding member 5. However, as long as the rotation of the socket S and the second base member 3 does not cause the first base member 2 to rotate, the structure is not limited to a ball bearing structure; a sliding structure such as a roller bearing may also be used. Furthermore, the base material protection jig 1 does not necessarily have to include the sliding member 5. In this case, the parts of the first base member 2 and the second base member 3 that come into contact with each other may be made of a material with a low coefficient of friction, and a lubricant such as grease may be applied between the first base member 2 and the second base member 3 to make them slide easily against each other.

[0040] In this embodiment, the retaining member 4 is configured to be provided on the second base member 3, but the position where the retaining member 4 is provided is not limited to the second base member 3. For example, the retaining member 4 may be provided on the first base member 2, or on the sliding member 5. It may also be provided so as to span the first base member 2, the second base member 3, and the sliding member 5. Furthermore, each of the first base member 2, the second base member 3, and the sliding member 5 may be formed from a magnetic material.

[0041] As described above, the first base member 2, the second base member 3, and the sliding member 5 are integrated in a removable manner, making them easy to carry and improving work efficiency. Furthermore, even if a part of the base material protection jig 1 is damaged, the part can be easily replaced. In addition, by holding the first base member 2, the second base member 3, and the sliding member 5 with magnetic force, it is possible to suppress the displacement of each component when the socket S rotates.

[0042] <Base metal fastening method> Here, we will describe a base material fastening method in which a fastening member is fastened to a base material P using a rotary tool T, with a base material protection jig 1 used to protect the surface Pa of the base material P. As shown in Figure 5, the base material fastening method includes a "jig attachment step (S1)" in which the base material protection jig 1 is attached to the tip of the rotary tool T, a "positioning step (S2)" in which the base material protection jig 1 is positioned between the tip of the rotary tool T and the base material P, a "fastening step (S3)" in which the tip of the rotary tool T is rotated to fasten the fastening member to the base material P, a "tool removal step (S4)" in which the rotary tool T is removed from the fastening member, and a "jig removal step (S5)" in which the base material protection jig 1 is removed from the tip of the rotary tool T. Note that other work steps in the fastening work of the base material P will not be explained.

[0043] In the "Jig Attachment Process (S1)," the worker attaches the base material protection jig 1 to the tip of the rotary tool T. Specifically, the worker uses the magnetic force of the holding member 4 to attract the upper surface of the second base member 3 to the tip surface Sb of the socket S.

[0044] In the "Placement Process (S2)," the worker places the base material protection jig 1 between the socket S and the base material P. Specifically, with the base material protection jig 1 attached to the socket S, the worker places the lower surface of the first base member 2 on the surface Pa of the base material P. At this time, the worker positions the base material protection jig 1 so that the bolt heads Ba are inserted through the first through hole 2a, the second through hole 3a, and the receiving through hole 5c, and engages the bolt heads Ba with the engagement holes Sa of the socket S.

[0045] In the "fastening process (S3)," the worker holds the first base member 2 and the second base member 3 in a relative rotatable position using magnetic force, and then rotates the tip of the rotary tool T to fasten the fastening members to the base material P. Specifically, the worker holds the first base member 2, the second base member 3, and the sliding member 5 with the magnetic force of the holding member 4, and then rotates the socket S to fasten the bolt B to the base material P. At this time, the second base member 3 rotates together with the socket S around an axis that extends in the fastening direction relative to the first base member 2 via the sliding member 5. As the second base member 3 rotates together with the socket S, the holding member 4 attracts the first base member 2 by magnetic force. Therefore, the second base member 3 rotates in such a way that its axis of rotation does not shift relative to the first base member 2.

[0046] In the "Tool Removal Process (S4)," the worker removes the rotary tool T from the bolt B. Specifically, the worker removes the engagement hole Sa of the socket S from the bolt head Ba. At this time, the rotary tool T is removed from the bolt head Ba with the base material protection jig 1 attached to the tip surface Sb of the socket S.

[0047] Furthermore, in the "Jig Removal Process (S5)," the worker removes the base material protection jig 1 from the socket S. Specifically, the worker removes the second base member 3 from the tip surface Sb of the socket S. Then, when performing the next fastening operation using a different socket S, the base material protection jig 1 is attached to the other socket S, and the fastening operation is performed from the arrangement process described above. Furthermore, when using the same socket S to perform the next fastening operation consecutively, the jig removal and jig installation steps are omitted, and the fastening operation is performed starting from the arrangement step described above.

[0048] As described above, the first base member 2, the second base member 3, and the sliding member 5 are integrated in a removable manner, making them easy to carry and improving work efficiency. Furthermore, even if a part of the base material protection jig 1 is damaged, the part can be easily replaced. In addition, by holding the first base member 2, the second base member 3, and the sliding member 5 with magnetic force, it is possible to suppress the displacement of each component when the socket S rotates.

[0049] In this embodiment, the base material protection jig 1 is attached to the socket S, and then the base material protection jig 1 and socket S are placed on the surface Pa of the base material P. However, this is not limited to this. For example, the base material protection jig 1 may be placed on the surface Pa of the base material P, and then the socket S may be placed on the second base member 3 of the base material protection jig 1.

[0050] <Second Embodiment> Next, the base material protection jig 11 of the second embodiment will be described with reference to Figure 6. Note that details that overlap with the base material protection jig 1 described above will be omitted. The base material protection jig 11 differs mainly in the configuration of the holding member 14.

[0051] The holding member 14 includes a first holding member 14a provided on the first base member 12, which magnetically attaches the first base member 12 to the surface Pa of the base material P, and a second holding member 14b provided on the second base member 13, which magnetically attaches the second base member 13 to the tip of the rotary tool T.

[0052] The first retaining member 14a is a magnetic member, such as a permanent magnet. When the second base member 3 rotates together with the socket S, the first retaining member 14a rotatably holds the second base member 13 relative to the first base member 12. When using the rotary tool T, the first retaining member 14a magnetically attracts the magnetic second base member 13 via the sliding member 15, holding the second base member 13 so that its axis of rotation, which extends in the fastening direction, does not shift. Furthermore, the first retaining member 14a attracts the magnetic base material P by magnetic force. The base material protection jig 11 is detachably attached to the base material P by the magnetic force of the first retaining member 14a.

[0053] The second retaining member 14b is a magnetic member, such as a permanent magnet. When the second base member 13 rotates with the socket S, the second retaining member 14b rotatably holds the second base member 13 relative to the first base member 12. When using the rotary tool T, the second retaining member 14b magnetically attracts the magnetic first base member 12 via the sliding member 15, holding the rotation axis of the second base member 13, which extends in the fastening direction, so as not to shift. Furthermore, the second retaining member 14b attracts the tip surface Sb of the magnetic socket S by magnetic force. The base material protection jig 11 is detachably attached to the socket S by the magnetic force of the second retaining member 14b.

[0054] The magnetic force of the second retaining member 14b is greater than that of the first retaining member 14a. That is, when fastening the fastening member with the rotary tool T, the base material protection jig 11 is attracted to both the socket S and the base material P, but the attraction force to the socket S is greater. Therefore, when the socket S of the rotary tool T is removed from the bolt head Ba, the base material protection jig 11 is removed from the base material P while still being attracted to the socket S. This allows the base material protection jig 11 to be stably attached to the base material P when fastening the fastening member with the rotary tool T. Furthermore, when performing subsequent fastening operations consecutively using the same socket S, the operation of attaching and detaching the base material protection jig 11 to the rotary tool T can be omitted. Therefore, work efficiency can be increased.

[0055] In this way, by providing the second retaining member 14b on the second base member 13 on the rotating tool T side, the second base member 13 can be attached to the rotating tool T by magnetic force. Also, by providing the first retaining member 14a on the first base member 12 on the base material P side, the first base member 12 can be attached to the base material P by magnetic force. Furthermore, since the magnetic force of the second retaining member 14b is greater than that of the first retaining member 14a, the base material protection jig 11 can be removed from the base material P while it is still attached to the rotating tool T. Therefore, the base material protection jig 11 can be stably attached to the base material P while improving work efficiency.

[0056] <Third Embodiment> Next, the base material protection jig 21 of the third embodiment will be described with reference to Figure 7. Note that details that overlap with the base material protection jig 1 and base material protection jig 11 described above will be omitted. The base material protection jig 21 differs mainly in the configuration of the holding member 24. Also, the configuration of the socket S attached to the rotary tool T is different.

[0057] The socket S comprises an inner socket S1 that is attached to the tip of the tool body, and an outer socket S2 that covers the inner socket S1. The outer socket S2 rotates together with the inner socket S1 around an axis extending in the fastening direction. However, the outer socket S2 does not necessarily have to rotate in conjunction with the inner socket S1.

[0058] The inner socket S1 has an engagement hole Sa that engages with the bolt head Ba. The engagement hole Sa is, for example, a dodecagonal or hexagonal hole. The base material protection jig 21 is detachably attached to the tip surface Sb of the outer socket S2 by magnetic force. The base material protection jig 21 prevents the surface Pa of the base material P from being rubbed by the rotation of the tip surface Sb of the outer socket S2.

[0059] The holding member 24 is a sliding member that allows the second base member 23 to rotate smoothly relative to the first base member 22, and is arranged between the first base member 22 and the second base member 23. It has magnetic rolling elements 24a and magnetic receiving parts 24b that receive the rolling elements 24a. The rolling element 24a and the receiving portion 24b rotatably hold the second base member 23 relative to the first base member 22 when the second base member 23 rotates together with the tip of the rotary tool T.

[0060] In other words, the holding member 24 functions as a sliding member, and when the second base member 23 rotates together with the socket S, it holds the second base member 23 rotatably relative to the first base member 22. When using the rotary tool T, the holding member 24 magnetically attracts the magnetic first base member 22 and the second base member 23, and holds the second base member 23 so that its axis of rotation, which extends in the fastening direction, does not shift.

[0061] Thus, since the rolling elements 24a and receiving parts 24b, which facilitate the sliding of the second base member 23 relative to the first base member 22, themselves possess magnetic force, the second base member 23 and the first base member 22 can be held magnetically with a simple configuration. Furthermore, since the holding member 24 does not protrude from the outer edges of the first base member 22 and the second base member 23, the base material protection jig 21 can be made compact. In this embodiment, both the rolling element 24a and the receiving portion 24b are configured to have magnetic force, but it is also possible to configure it so that only one of them has magnetic force.

[0062] <Other Embodiments> In this embodiment, the base material protection jig 1 was described as being used in the process of fastening the base material P with a fastening member. However, the base material protection jig 1 may be used for purposes other than fastening. For example, the base material protection jig 1 may be attached to the sole of a worker's shoe to prevent scratching the floor surface of the work site. This reduces friction caused by the rotation of the shoe sole when a worker is working on a floor surface that is easily scratched, thereby preventing scratches on the floor surface.

[0063] The above embodiments mainly described the base material protection jig and base material fastening method according to the present invention. However, the embodiments described above are merely examples to facilitate understanding of the present invention and do not limit it. The present invention can be modified and improved without departing from its spirit, and of course, equivalents thereof are included. In particular, the embodiments described above are merely examples and do not limit the present invention. [Explanation of Symbols]

[0064] 1, 11, 21 Base material protection jig 2, 12, 22 First base member 2a First through hole 2b First sliding groove 3, 13, 23 Second base member 3a Second through hole 3b Second sliding groove 3c recess 4, 14, 24 Retaining members 5, 15 Sliding members 5a Rolling element 5b Receiving part 5c Through hole in receiving section 14a First retaining member 14b Second holding member 24a Rolling element 24b Receiving part P Base material Pa surface Pb bolt hole B Bolt (fastening component) Ba Bolt Head N Nut (Fastening Member) T Rotary tool S Socket (Tip of a rotary tool) Sa engagement hole Sb tip surface S1 Inner Socket S2 Outer Socket

Claims

1. A base material protection jig used when fastening a fastening member to a base material with a rotary tool, which is removable from the tip of the rotary tool and protects the surface of the base material, A first base member is provided on the surface of the base material and surrounds the fastening member, A second base member is positioned between the tip of the rotary tool and the first base member, and is rotatable relative to the first base member, The device comprises the first base member and a holding member that holds the second base member by magnetic force, The base material protection jig is characterized in that the holding member rotatably holds the second base member relative to the first base member when the second base member rotates together with the tip of the rotary tool.

2. The retaining member is provided on the second base member, The base material protection jig according to claim 1, characterized in that the base material protection jig is detachably attached to the tip of the rotating tool by the magnetic force of the holding member.

3. The second base member has a ring shape that covers the periphery of the fastening member, The retaining members are provided in multiple locations on the outer circumferential surface of the second base member. The base material protection jig according to claim 2, characterized in that the plurality of holding members are arranged radially when viewed from the fastening direction of the fastening member.

4. The aforementioned retaining member is A first retaining member is provided on the first base member and is detachably attached to the surface of the base material by magnetic force, The second base member is provided with a second retaining member which is detachably attached to the tip of the rotary tool by magnetic force, The base material protection jig according to claim 1 or 2, characterized in that the magnetic force of the second retaining member is greater than the magnetic force of the first retaining member.

5. The aforementioned retaining member is Multiple rolling elements having magnetic properties are arranged between the first base member and the second base member, It has a receiving portion for receiving the rolling element, The base material protection jig according to claim 1, characterized in that the rolling element holds the second base member rotatably with respect to the first base member when the second base member rotates together with the tip of the rotating tool.

6. The aforementioned retaining member is Multiple rolling elements are arranged between the first base member and the second base member, Having a magnetic force and a receiving portion that receives the rolling element, The base material protection jig according to claim 1, characterized in that the receiving portion rotatably holds the second base member relative to the first base member when the second base member rotates together with the tip of the rotary tool.

7. A base material fastening method comprising fastening a fastening member to a base material using a rotary tool, with a base material protection jig used to protect the surface of the base material, The arrangement step involves placing the base material protection jig between the tip of the rotating tool and the base material, A fastening step of rotating the tip of the rotary tool to fasten the fastening member to the base material, The process includes removing the base material protection jig from the tip of the rotating tool, In the arrangement step, the second base member is placed on the tip of the rotating tool, and the first base member is placed on the surface of the base material. The method for fastening a base material, characterized in that, in the fastening step, the first base member and the second base member are held by magnetic force, and the tip of the rotary tool is rotated to fasten the fastening member to the base material.

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