JP7793024B2 - Insertion Device - Google Patents

Description

The present invention relates to an insert device that uses a magnetic attraction tool to magnetically attract magnetic objects.

In the past, workers had to bend down and manually pick up nails, pieces of iron, and other items that had fallen to the ground. In response to this, a technology has been proposed that uses a magnetic jig to attract nails, pieces of iron, and other items.

For example, Patent Document 1 discloses a hammer with a nail-retrieving function that attracts and retrieves nails from a nail bag worn on the waist. In the following paragraphs, the reference numerals in Patent Document 1 are shown in parentheses. The hammer with a nail-retrieving function (Ha) comprises a metal hammer body (1) to which a wooden handle (2) is attached, a hole (5) drilled in the base end surface of the handle (2), and a magnet (3) embedded in the hole (5). When using the hammer (Ha) to retrieve a nail (9) from a nail bag (V), the base end of the handle (2) is inserted into the nail bag and pulled up. The nail (9) is then attracted to the magnet (3), allowing the worker to transfer it to their left hand and drive the nail.

Japanese Patent Application Laid-Open No. 2000-176858

However, the hammer with nail removal function (magnetic attraction tool) of Patent Document 1 has a magnet fixed to the handle of the tool, which can cause various problems. For example, when magnetic objects such as iron filings or iron pieces are attracted to the handle of the tool, the worker has to manually remove the magnetic object from the tool each time they continue to use the tool, which is a hassle. Also, because the handle length is fixed, there are problems such as the inability to pick up nails or iron pieces that have fallen in narrow spaces. In other words, conventional magnetic attraction tools have an issue in that they are unable to fully utilize their convenience.

The present invention was made to solve the above-mentioned problems, and its purpose is to provide a magnetic attraction device with improved convenience and an insert device using said magnetic attraction device.

A magnetic attraction tool according to one embodiment of the present invention is a magnetic attraction tool that is detachably attached to a shaft member and is used to magnetically attract a magnetic object, and includes:
a suction tool body extending from a base end to a tip end;
a connecting portion formed on a base end side of the suction tool body for detachably connecting the tip of the shaft member;
The magnetic attracting portion is characterized by exerting a magnetic force on the outside of the suction tool body to magnetically attract a magnetic object to the outer surface of the magnetic attracting device at a position closer to the tip of the suction tool body than the connecting portion.

A further aspect of the magnetic attraction device of the present invention is the magnetic attraction device of the above aspect, characterized in that the connection portion has an opening through which the tip of the shaft member can be inserted, and is configured to be pressed against the outer peripheral surface of the shaft member inserted through the opening.

A further aspect of the magnetic attracting device of the present invention is the magnetic attracting device of the above aspect, characterized in that the connecting portion is formed from an elastic material and has an annular portion extending in the axial direction of the shaft member inserted through the opening, and the annular portion is pressed against the outer surface of the shaft member while expanding and deforming in accordance with the outer peripheral shape of the shaft member.

A further aspect of the magnetic attracting device of the present invention is the magnetic attracting device of the above aspect, characterized in that a socket having an outer circumferential shape with a polygonal cross section is provided at the tip of the shaft member, and the annular portion of the connecting portion is capable of expanding in diameter and deforming to match the outer shape of the socket.

A further aspect of the magnetic attraction device of the present invention is the magnetic attraction device of the above aspect, characterized in that the connection portion is configured to be disconnected by forcibly moving the attraction device main body in a direction away from the tip of the shaft member along the axial direction of the shaft member.

A magnetic attracting device according to a further aspect of the present invention is the magnetic attracting device according to the above aspect, wherein the magnetic attracting portion includes a magnet and a magnet holding portion that holds the magnet on the attracting device main body,
The suction tool body is characterized by having a restricting portion formed between the connection portion and the magnet holding portion, which restricts the tip of the shaft member connected to the connection portion from abutting against the magnet held in the magnet holding portion.

A further aspect of the magnetic attracting device of the present invention is the magnetic attracting device of the above aspect, characterized in that the restricting portion is a partition wall that separates the connecting portion and the magnet holding portion inside the attracting device main body.

A further aspect of the magnetic attracting device of the present invention is the magnetic attracting device of the above aspect, characterized in that the connecting portion is formed so as to be press-fitted into a polygonal socket hole or a round hole provided at the tip of the shaft member.

A magnetic attraction tool according to a further embodiment of the present invention is the magnetic attraction tool according to the above embodiment, further comprising an exterior body having an action surface that covers the magnetically attracted portion from the outside and that is movably supported by the attraction tool body,
The outer casing is characterized in that it can be displaced between a reference position in which a magnetic object can be magnetically attracted to the action surface by magnetic force from the magnetic attraction portion, and a separated position in which the action surface is relatively separated from the magnetic attraction portion.

A further aspect of the magnetic attracting device of the present invention is the magnetic attracting device of the above aspect, characterized in that the attracting device main body has a cylindrical shape extending in the axial direction, the magnetic attraction portion is formed at the tip of the attracting device main body, and the exterior body is formed in a bottomed cylindrical shape with the working surface on the outer surface of the bottom wall, and slides axially relative to the attracting device main body.

A magnetic attraction tool according to a further aspect of the present invention is the magnetic attraction tool according to the above aspect, further comprising a locking means for selectively locking the exterior body at the reference position and/or the separated position relative to the attraction tool body,
The locking state by the locking means can be released or established by rotating the exterior body relative to the suction tool body in the axial direction.

A further aspect of the magnetic attraction device of the present invention is the magnetic attraction device of the above aspect, characterized in that the outer surface of the magnetic attraction device to which the magnetic object is attracted comprises a flat surface and a protruding step portion protruding from a portion of the flat surface.

An insert device according to one aspect of the present invention includes the magnetic attracting tool of the above aspect, which has a flat surface at its tip for magnetically attracting a magnetic object;
an insert comprising: an insert body extending in an axial direction so as to be inserted into a through-hole of a form; a top wall made of a magnetic material formed at a base end of the insert body and magnetically attachable to the flat surface of the magnetic attraction device; and a fastening means formed at a tip end side of the insert body for fastening to the periphery of the through-hole of the form;
A protruding step portion is provided on a part of the flat surface of the magnetic attraction tool to restrict lateral sliding of the insert magnetically attracted to the magnetic attraction tool.

One form of the magnetic attraction device of the present invention can be attached to and detached from any shaft member via a connecting portion formed on the base end, and the magnetic attachment portion can magnetically attach a magnetic object to the outer surface of the magnetic attraction device on the tip side of the connecting portion. In other words, the magnetic attraction device can be detachably attached to a shaft member selected depending on the situation, and the desired magnetic attraction force can be applied to the shaft member. Therefore, the magnetic attraction device of the present invention improves convenience when using a shaft member to magnetically attract magnetic objects.

In addition to the effects of the above-described invention, a magnetic attraction device according to a further embodiment of the present invention makes it possible to easily attach and detach the magnetic attraction device to and from the shaft member by inserting the shaft member into the connecting portion through the opening or by pulling the shaft member out of the connecting portion through the opening.

In accordance with a further aspect of the magnetic attraction device of the present invention, in addition to the effects of the invention described above, the connecting portion is formed from an elastic material, making it possible to accommodate shaft members with various outer peripheral shapes.

In addition to the effects of the above-described invention, a magnetic attraction device according to a further embodiment of the present invention allows the magnetic attraction device to be easily attached by placing the connecting portion over the socket with a polygonal cross section on the shaft member.

In addition to the effects of the above-described invention, a magnetic attraction device according to a further embodiment of the present invention allows the magnetic attraction device to be released from the shaft member by the simple operation of forcibly moving the attraction device body in a direction away from the tip of the shaft member along the axial direction of the shaft member.

In a further embodiment of the magnetic attraction device of the present invention, in addition to the effects of the invention described above, the restricting portion prevents the tip of the shaft member connected to the connecting portion from coming into contact with the magnet and damaging the magnet.

In a further embodiment of the magnetic attractor of the present invention, in addition to the effects of the invention described above, a partition wall inside the main body prevents the tip of the shaft member connected to the connection part from coming into contact with the magnet and damaging the magnet. Furthermore, because the partition wall prevents the magnet from being exposed to the outside from the connection part, iron powder that enters from the connection part side can be prevented from directly adhering to the magnet. This makes cleaning easier, as even if iron powder enters from the connection part side, it will not directly adhere to the magnet.

In addition to the effects of the above-described invention, a magnetic attraction device according to a further embodiment of the present invention allows the magnetic attraction device to be connected to a shaft member by press-fitting the connecting portion into a polygonal socket hole or a round hole provided at the tip of the shaft member.

In addition to the effects of the invention described above, a magnetic attraction device according to a further embodiment of the present invention is capable of magnetically attracting a magnetic object to the action surface when the exterior body is in the reference position. On the other hand, because the magnetic attraction force on the action surface weakens when the exterior body is displaced to the separated position, it is possible to selectively create a situation in which the magnetic attraction device does not attract, or has difficulty attracting, a magnetic object. In other words, by operating the magnetic attraction device, it is possible to easily remove a magnetic object that has been magnetically attracted to the action surface from the magnetic attraction device without touching it with one's hand.

In addition to the effects of the above-described invention, a magnetic attractor according to a further embodiment of the present invention can be made compact by inserting the cylindrical attractor body into a bottomed cylindrical outer casing and making it axially slidable.

In addition to the effects of the above-described invention, a magnetic attraction device according to a further aspect of the present invention can stably maintain the magnetic attraction device in a magnetically attached and/or non-magnetic state using a locking means. Furthermore, the engagement state can be easily established or released by the simple operation of rotating the outer casing relative to the main body.

In addition to the effects of the above invention, a magnetic attraction device according to a further embodiment of the present invention has both a flat surface and a protruding step on the outer surface of the magnetic attraction device, allowing the magnetic object to be magnetically attracted at a position set back from the protruding step. In other words, the flat surface and the magnetic object can be magnetically attracted while being relatively far apart, reducing the occurrence of physical friction or pressure between them.

The insert device of one embodiment of the present invention can achieve the effects of the magnetic attraction device according to the above invention as an insert device. That is, with the insert device, the insert is held by the magnetic attraction device using magnetic force, with the protruding step restricting the insert from sliding sideways. The insert can then be easily attached to the formwork by manipulating the shaft member to which the magnetic attraction device is attached and pushing the insert together with the magnetic attraction device into the through-hole of the formwork. Furthermore, because the magnetic attraction device and the insert are connected by magnetic force, the magnetic attraction device can be easily removed from the insert after the insert has been attached to the formwork.

1A is a schematic perspective view of a magnetic attraction device according to an embodiment of the present invention, as viewed from above, and FIG. 1B is a schematic perspective view of a magnetic attraction device according to an embodiment of the present invention, as viewed from below. 2A is a plan view, FIG. 2B is a bottom view, FIG. 2C is a front view, and FIG. 2D is a side view of the magnetic attraction device of FIG. 1. 3A is a cross-sectional view taken along line AA of the magnetic attraction device shown in FIG. 2, and FIG. 3B is a cross-sectional view taken along line BB of the magnetic attraction device shown in FIG. 3 is a cross-sectional view of the magnetic attraction tool shown in FIG. 2 taken along the line CC. 2A is a schematic perspective view of a modified non-magnetic form of the magnetic attraction device of FIG. 1, as viewed from above, and FIG. 2B is a schematic perspective view of a modified non-magnetic form of the magnetic attraction device of FIG. 1, as viewed from below. 6A is a plan view, FIG. 6B is a bottom view, FIG. 6C is a front view, and FIG. 6D is a side view of the magnetic attraction device of FIG. 5. 7A is a cross-sectional view taken along the line DD of the magnetic attraction device shown in FIG. 6, and FIG. 7B is a cross-sectional view taken along the line EE of the magnetic attraction device shown in FIG. 7 is a cross-sectional view of the magnetic attraction tool of FIG. 6 taken along the line FF. 2A and 2B are a front view and a cross-sectional view taken along the line N-N, respectively, of an intermediate form between the magnetically attached form and the non-magnetically attached form of the magnetic attracting device of FIG. 1; FIG. 2 is an exploded perspective view of the magnetic attraction device of FIG. 1 . 1A is a schematic perspective view of an attracting tool body of a magnetic attracting tool according to one embodiment of the present invention, as viewed from above, and FIG. 1B is a schematic perspective view of an attracting tool body of a magnetic attracting tool according to one embodiment of the present invention, as viewed from below. 12A is a plan view, FIG. 12B is a bottom view, FIG. 12C is a front view, and FIG. 12D is a side view of the suction tool body of FIG. 11. 13A is a cross-sectional view taken along the line GG, and FIG. 13B is a cross-sectional view taken along the line HH of the suction tool body of FIG. 12. 13A is a cross-sectional view taken along line II, FIG. 13B is a cross-sectional view taken along line JJ, and FIG. 13C is a cross-sectional view taken along line KK of the suction tool body of FIG. 1A is a schematic perspective view of an exterior body of a magnetic attraction device according to an embodiment of the present invention, as viewed from above, and FIG. 1B is a schematic perspective view of an exterior body of a magnetic attraction device according to an embodiment of the present invention, as viewed from below. 16A is a plan view, FIG. 16B is a bottom view, FIG. 16C is a front view, and FIG. 16D is a side view of the exterior body of FIG. 15. 17A is a cross-sectional view of the exterior body of FIG. 16 taken along line LL, and FIG. 17B is a cross-sectional view of the exterior body of FIG. 16 taken along line MM. 1 is a schematic diagram showing a first example of mounting the magnetic attraction tool of the present embodiment to a shaft member. FIG. 10 is a schematic diagram showing a second example of mounting the magnetic attraction tool of the present embodiment to a shaft member. FIG. 1A is a schematic diagram showing a state in which a magnetic object is magnetically attracted using the magnetic attraction device of this embodiment, and FIG. 1B is a schematic diagram showing a state in which the magnetic attraction of the magnetic object is released. 1 is an exploded perspective view showing an insert device according to an embodiment of the present invention; 22 is a schematic longitudinal cross-sectional view of the insert device of FIG. 21 . 23 is a schematic cross-sectional view of an installation structure in which the insert of FIG. 22 is attached to a through hole in a deck plate. 24A to 24C are schematic diagrams showing the steps of constructing the installation structure of FIG. 23; FIG. 10 is a diagram showing a magnetic attraction device according to another embodiment of the present invention. FIG. 10 is a diagram showing a magnetic attraction device according to another embodiment of the present invention. FIG. 10 is a diagram showing a magnetic attraction device according to another embodiment of the present invention. FIG. 10 is a diagram showing a magnetic attraction device according to another embodiment of the present invention.

One embodiment of the present invention will be described below with reference to the drawings. Note that the shapes of each figure referred to in the following description are conceptual or schematic diagrams used to explain preferred shapes and dimensions, and the dimensional ratios do not necessarily correspond to the actual dimensional ratios. In other words, the present invention is not limited to the dimensional ratios shown in the drawings.

The magnetic attraction device 100 of one embodiment of the present invention is detachably attached to a shaft member such as a tool handle or a pipe, and is used to magnetically attract magnetic objects. In this embodiment, examples of magnetic objects that can be magnetically attracted by the magnetic attraction device 100 include nails, iron filings, iron pieces, and inserts, but magnetic objects are not limited to these and include all objects that can be magnetically attracted as needed.

First, the overall configuration of the magnetic attraction device 100 of this embodiment will be described with reference to Figures 1 to 10. Figures 1 to 4 show the magnetic attraction device 100 in a magnetic form capable of magnetically attracting a magnetic object. Figures 5 to 8 show the magnetic attraction device 100 in a non-magnetic form, which is deformed from the magnetic form and does not magnetically attract a magnetic object. Specifically, Figures 1(a) and 1(b) are schematic perspective views of the magnetic attraction device 100 of this embodiment in a magnetic form. Figures 2(a) to 2(d) are plan, bottom, front, and side views of the magnetic attraction device 100. Figures 3(a) and 3(b) are A-A and B-B cross-sectional views of the magnetic attraction device 100. Figure 4 is a CC cross-sectional view of the magnetic attraction device 100. Figures 5(a) and 5(b) are schematic perspective views of the magnetic attraction device 100 in a non-magnetic form. Figures 6(a) to 6(d) are plan, bottom, front, and side views of the magnetic attraction device 100 in a non-magnetic form. Figures 7(a) and 7(b) are D-D and E-E cross-sectional views of the magnetic attraction device 100 in a non-magnetic form. Figure 8 is an F-F cross-sectional view of the magnetic attraction device 100 in a non-magnetic form. Figures 9(a) and 9(b) are a front view and N-N cross-sectional view of the magnetic attraction device 100 in an intermediate form. Figure 10 is an exploded perspective view of the magnetic attraction device 100.

As shown in Figures 1 to 4, the magnetic attraction device 100 has an overall cylindrical shape extending axially from the base end to the tip. The base end of the magnetic attraction device 100 is open, and the tip is closed. The magnetic attraction device 100 also includes an attraction device main body 101 and an exterior body 110 attached to the attraction device main body 101. The exterior body 110 is movably supported by the attraction device main body 101. The magnetic attraction device 100 can magnetically attract a predetermined magnetic object when it is in the magnetically contracted form shown in Figures 1 to 4. The magnetic attraction device 100 can also transform into an axially elongated non-magnetic form as shown in Figures 5 to 8. In this non-magnetic form, the magnetic attraction device 100 is not intended to magnetically attract a magnetic object. The magnetic attraction device 100 can also be deformed to expand and contract by axially moving the exterior body 110 relative to the attraction device main body 101, as shown in the intermediate form of Figure 9. The attracting device main body 101 and the exterior body 110 are detachably assembled as shown in Figure 10. Before explaining the configuration of the magnetic attracting device 100 in detail, the structures of the attracting device main body 101 and the exterior body 110 that make up the magnetic attracting device 100 will be explained.

The suction instrument body 101 is shown in Figures 11 to 14. Figures 11(a) and (b) are schematic perspective views of the suction instrument body 101. Figures 12(a) to (d) are plan, bottom, front, and side views of the suction instrument body 101. Figures 13(a) and (b) are G-G and H-H cross-sectional views of the suction instrument body 101 taken along the axial direction. Figures 14(a) to (c) are I-I, J-J, and K-K cross-sectional views of the suction instrument body 101 taken perpendicular to the axial direction.

The suction instrument body 101 has a hollow cylindrical shape extending axially from the base end to the tip. The base and tip ends of the suction instrument body 101 are open. The suction instrument body 101 comprises a cylindrical peripheral wall portion 102 and an annular connecting portion 103 formed on the base end side of the peripheral wall portion 102. In this embodiment, the peripheral wall portion 102 is made of a hard synthetic resin material, while the connecting portion 103 is made of an elastic material such as rubber.

The connecting portion 103 is formed on the base end of the suction instrument body 101 and is configured to detachably connect to an axial member. The connecting portion 103 can deform to accommodate various shapes of the tip of the axial member. As shown in FIG. 13 , the connecting portion 103 is composed of an opening 103a that opens toward the axial tip, an annular portion 103b that is connected to the opening 103a and extends in the axial direction, a joining portion 103c that is joined to the outer surface of the peripheral wall portion 102 proximal to the annular portion 103b, and a partition wall 103d formed between the annular portion 103b and the joining portion 103c. The opening 103a is sized to allow the tip of the axial member to be inserted with or without radial expansion. Furthermore, because the opening 103a is open in the axial direction, the connecting portion 103 can be disconnected by forcibly moving the suction instrument body 101 axially away from the tip of the axial member. The annular portion 103b is configured to expand and deform in accordance with the outer peripheral shape of the shaft member, with its inner surface pressed against the outer surface of the shaft member. The joining portion 103c can be integrally joined to the outer peripheral surface of the base end of the peripheral wall portion 102 by elastic crimping, adhesive, or the like. The partition wall 103d extends across the entire cross section of the connecting portion 103 to separate the internal space of the annular portion 103b from the internal space of the peripheral wall portion 102, and functions as a restricting portion that restricts movement of the shaft portion inserted into the connecting portion 103 toward the peripheral wall portion 102.

As shown in Figure 12(c), the outer surface of the peripheral wall portion 102 is recessed with a U-shaped guide groove 106 and a straight guide groove 109. The guide groove 106 and the guide groove 109 are formed in two locations, one on the front surface and one on the back surface of the outer surface of the peripheral wall portion 102. The guide groove 106 is a groove for guiding the axial and circumferential sliding movement of the engaging protrusion 115 of the exterior body 110, which will be described later. The guide groove 106 consists of a vertical groove extending in the axial direction and horizontal grooves extending circumferentially from the base end (upper end) and tip end (lower end) of the vertical groove. As shown in Figure 14(a), the horizontal groove on the base end side of the guide groove 106 has a space capable of accommodating the engaging protrusion 115, and a first locking claw 107 is provided between the space and the vertical groove. As shown in FIG. 14(b), the horizontal groove at the tip of guide groove 106 similarly has a space capable of accommodating engaging protrusion 115, with second engaging claw 108 provided between the space and the vertical groove. First engaging claw 107 and second engaging claw 108 prevent engaging protrusion 115 from moving circumferentially. However, when a circumferential force exceeding a certain level is applied to engaging protrusion 115, engaging protrusion 115 (which is relatively elastically displaced in the radial direction) can overcome the first engaging claw 107 and second engaging claw 108. Furthermore, an introduction groove 109 communicates with the tip of the vertical groove of guide groove 106. The introduction groove 109 opens at the tip (lower end) of peripheral wall portion 102. The engaging protrusion 115 of exterior body 110 is introduced into guide groove 106 via introduction groove 109, thereby assembling exterior body 110 to suction tool body 101.

The tip of the suction device body 101 is provided with a magnetic attraction section 105 that exerts a magnetic force on the outside. The magnetic attraction section 105 is configured to magnetically attract a magnetic object to the outer surface of the magnetic attraction device 100, closer to the tip than the connecting section 103 of the suction device body 101. More specifically, as shown in Figures 13(a), (b), and 14(c), the magnetic attraction section 105 comprises a button-shaped magnet 105a and a magnet holding section 105b that holds the magnet 105a on the suction device body 101. The magnet 105a is preferably selected from a strong permanent magnet such as a neodymium magnet. The magnet holding section 105b is a space for holding the magnet 105a inside the peripheral wall section 102. The magnet 105a may be fitted or glued to the inner surface of the peripheral wall section 102. The magnet holding section 105b is open at the tip of the suction device body 101. That is, magnet 105a is exposed from suction device main body 101 toward the tip so that its magnetic force can be effectively exerted outside. Also, as shown in Figure 14 (c), magnet holder 105b is open in part of its radial direction so that magnet 105a can be introduced inside peripheral wall 102. On the other hand, partition 103d prevents magnet 105a from being exposed to the outside from connection portion 103, preventing iron powder that enters from connection portion 103 from directly attaching to magnet 105a. This makes cleaning easier because iron powder that enters from connection portion 103 does not directly attach to magnet 105a.

Furthermore, as shown in Figures 14(a) and (b), the inner surface of the peripheral wall portion 102 is provided with multiple axially extending protrusions 102a. These protrusions 102a reinforce the structural strength of the peripheral wall portion 102.

The exterior body 110 is shown in Figures 15 to 17. The exterior body 110 covers the tip portion of the suction device main body 101 and functions to protect the magnetically attached portion 105 (magnet 105a). Figures 15(a) and (b) are schematic perspective views of the exterior body 110. Figures 16(a) to (d) are plan, bottom, front, and side views of the exterior body 110. Figures 17(a) and (b) are L-L and M-M cross-sectional views of the exterior body 110.

The exterior body 110 has a cylindrical shape with a bottom that extends axially from the base end to the tip. In this embodiment, the exterior body 110 is formed from a hard synthetic resin, although this is not a limitation of the present invention. The exterior body 110 has a cylindrical wall 111 that is circular in cross section and extends axially, and a bottom wall 112 that closes the tip of the cylindrical wall 111. The cylindrical wall 111 is open at the base end and has a size and shape that allows the tip portion of the suction tool body 101 to be inserted therein. The bottom wall 112 closes the tip of the cylindrical wall 111 so as to externally cover the magnetically attracted portion 105 of the suction tool body 101. The bottom wall 112 is formed as a flange that is larger than the outer diameter of the cylindrical wall 111. The outer surface of the bottom wall 112 is provided with an action surface 113 for magnetically acting on a magnetic object. This action surface 113 is flat. Additionally, the outer surface of the bottom wall 112 is provided with protruding steps 114 that rise in a stepped manner from the action surface 113. The protruding steps 114 extend in an arc shape at two locations near the outer periphery of the outer surface of the bottom wall 112. For example, if the magnetic object is iron powder scattered on the ground, the protruding steps 114 function to keep the action surface 113 away from the magnetic object and the ground, preventing the action surface 113 from being damaged by strong friction with the magnetic object or the ground. As will be described later, the protruding steps 114 also function to prevent the insert (see Figure 20, etc.) magnetically attached to the action surface 113 from sliding sideways.

As shown in Figure 17(b), a pair of engaging protrusions 115, 115 protruding from the inner circumferential surface toward the center is provided near the base end of the cylindrical wall 111 of the exterior body 110. The pair of engaging protrusions 115, 115 are arranged on the same diameter and face each other across the center. The engaging protrusions 115 have a shape and dimensions that allow them to slide in the vertical and horizontal grooves of the guide groove 106. The engaging protrusions 115 can also slide in the introduction groove 109. The engaging protrusions 115 cooperate with the first engaging claw 107 and second engaging claw 108 in the guide groove 106 to function as an engaging means that maintains the exterior body 110 in a predetermined shape relative to the suction instrument main body 101.

A grip portion 116 is formed to protrude from the outer circumferential surface of the cylindrical wall 111 of the exterior body 110. This grip portion 116 has a shape that allows an operator to place their fingers around it. A through-hole is formed in the center of the grip portion 116. The magnetic attraction device 100 may be carried by the user by passing a strap or the like through this through-hole.

An arrow-shaped display unit 117 is formed on the outer peripheral surface of the cylindrical wall 111 of the exterior body 110. The display unit 117 visually instructs the user how to operate the exterior body 110 relative to the suction device main body 101. Specifically, when the user operates the exterior body 110 along the arrow, the exterior body 110 can be locked to the suction device main body 101.

Based on the above description of the suction device main body 101 and exterior body 110, the magnetically attracted form, non-magnetic form, and intermediate form of the magnetically attracted device 100 will now be described in more detail.

In the magnetic attracting device 100 of this embodiment, the attracting device main body 101 and the exterior body 110 are assembled in a nested structure so that the cylindrical, bottomed exterior body 110 covers the tip portion of the cylindrical attracting device main body 101 from the outside. The two engaging protrusions 115 of the exterior body 110 fit into the two guide grooves 106 of the attracting device main body 101, allowing the attracting device main body 101 to movably and detachably support the exterior body 110. Furthermore, the magnet 105a is isolated from the outside by the partition wall 103d of the connecting part 103 and the exterior body 110, preventing iron powder and the like from being magnetically attracted to the magnet 105a.

In the magnetic attraction device 100 in the magnetically attached form shown in Figures 1 to 4, the action surface 113 of the exterior body 110 is located closest to the magnetically attached portion 105 at the tip of the attraction device main body 101. This position is the reference position. The action surface 113 covers the magnetically attached portion 105 from its tip. Because the distance between the action surface 113 in the reference position and the magnetically attached portion 105 (magnet 105a) is small, the action surface 113 can exert a magnetic force on the outside of the magnetic attraction device 100 and magnetically attract a magnetic object. In other words, in this magnetically attached form, the magnetic attraction device 100 can magnetically attract a magnetic object to its outer surface.

The exterior body 110 is locked to the suction device body 101 by a locking mechanism so that the magnetic attraction device 100 maintains its magnetically attracted state. Specifically, as shown in FIG. 4 , each engagement protrusion 115 of the exterior body 110 is housed in a horizontal groove on the tip side of each guide groove 106 of the suction device body 101. Because the engagement protrusion 115 is housed in the horizontal groove on the tip side of the guide groove 106, the exterior body 110 cannot move toward the axial tip side (extension direction) relative to the suction device body 101. Furthermore, a first engagement claw 107 is present on the vertical groove side of the engagement protrusion 115. This first engagement claw 107 locks the engagement protrusion 115, thereby restricting the engagement protrusion 115 from sliding within the vertical groove (i.e., restricting the exterior body 110 from rotating circumferentially relative to the suction device body 101). However, by rotating the exterior body 110 circumferentially relative to the suction device body 101 with a force strong enough to exceed a certain level, the engaging protrusions 115 are elastically displaced radially outward relative to the suction device body 101, overcoming the first engaging claws 107 and disengaging from the locked state. As a result, the engaging protrusions 115 can move between the horizontal groove and the vertical groove of the guide groove 106 when the user rotates the exterior body 110. In other words, when the magnetic attraction device 100 is in the magnetically attached state, the locked state provided by the locking means can be established or released by rotating the exterior body 110 axially relative to the suction device body 101.

In the magnetic attraction device 100 in the non-magnetic form shown in Figures 5 to 8, the action surface 113 of the exterior body 110 is at the farthest position from the magnetic attraction portion 105 at the tip of the attraction device main body 101. This position is called the separated position. The action surface 113 covers the magnetic attraction portion 105 from its tip. Because the distance between the action surface 113 in the separated position and the magnetic attraction portion 105 (magnet 105a) is sufficiently large, the magnetic force exerted by the action surface 113 on the outside of the magnetic attraction device 100 is weakened, and the action surface 113 cannot magnetically attract a magnetic object. In other words, in the non-magnetic form, the magnetic attraction device 100 does not magnetically attract a magnetic object, or is capable of removing a magnetically attracted magnetic object from its outer surface.

The exterior body 110 is locked to the suction device body 101 by a locking mechanism so that the magnetic attraction device 100 maintains a non-magnetic state. Specifically, as shown in FIG. 8 , each engagement protrusion 115 of the exterior body 110 is housed in the horizontal groove on the base end side of each guide groove 106 of the suction device body 101. Because the engagement protrusion 115 is housed in the horizontal groove on the base end side of the guide groove 106, the exterior body 110 cannot move axially toward the base end (shortening direction) relative to the suction device body 101. Furthermore, a second engagement claw 108 is present on the vertical groove side of the engagement protrusion 115. This second engagement claw 108 locks the engagement protrusion 115, thereby restricting the engagement protrusion 115 from sliding within the vertical groove (i.e., restricting the exterior body 110 from rotating circumferentially relative to the suction device body 101). However, by rotating the exterior body 110 circumferentially relative to the suction device body 101 with a force greater than a certain level, the engaging protrusions 115 are elastically displaced radially outward and overcome the second engaging claws 108, thereby releasing the locked state. As a result, the engaging protrusions 115 can move between the horizontal groove and vertical groove of the guide groove 106 when the user rotates the exterior body 110. In other words, when the magnetic attraction device 100 is in the non-magnetic form, the locked state provided by the locking means can be released or established by rotating the exterior body 110 axially relative to the suction device body 101.

To transform the magnetic attraction device 100 from a magnetically attached state to a non-magnetically attached state, the exterior body 110 is rotated clockwise around the axial direction relative to the attraction device main body 101 to release the locked state. At this time, the engaging protrusion 115 enters the vertical groove of the guide groove 106. Then, via the intermediate state of the magnetic attraction device 100 shown in Figure 9, the engaging protrusion 115 can be moved within the vertical groove of the guide groove 106, sliding the exterior body 110 toward the axial tip relative to the attraction device main body 101. As a result, the operating surface 113 can be moved from the reference position to the separated position relative to the magnetically attached portion 105. Furthermore, to lock the magnetic attraction device 100 into a non-magnetic state, the exterior body 110 is rotated counterclockwise according to the arrow indicated by the indicator 117. The engaging protrusion 115 is then received in the horizontal groove of the guide groove 106, establishing the locked state. To transform the magnetic attraction device 100 from a non-magnetic form to a magnetic form, simply follow the steps described above in reverse order.

Next, the process of separating/assembling the exterior body 110 from the suction tool main body 101 will be described. In the separation process, in the intermediate form of the magnetic attraction tool 100 shown in FIG. 9 , the exterior body 110 is twisted to insert the engaging protrusion 115 from the vertical groove of the guide groove 106 into the introduction groove 109. The engaging protrusion 115 is then moved from the open end of the introduction groove 109 to the tip, thereby separating the suction tool main body 101 and the exterior body 110. To assemble the exterior body 110 to the suction tool main body 101, the suction tool main body 101 and the exterior body 110 are manipulated by hand in the reverse order of the above-described process, inserting the engaging protrusion 115 into the introduction groove 109 from the open end, and then inserting the engaging protrusion 115 from the introduction groove 109 into the vertical groove of the guide groove 106, thereby assembling the suction tool main body 101 and the exterior body 110. Furthermore, because the introduction groove 109 is connected to a position spaced apart from the tip of the longitudinal groove of the guide groove 106, the engaging protrusion 115 is prevented from unintentionally moving from the guide groove 106 to the introduction groove 109, preventing the magnetic attraction device 100 from accidentally separating.

Next, with reference to Figures 18 and 19, we will explain examples of attaching the magnetic attraction device 100 to different shaft members.

Figure 18 shows a first mounting example in which the shaft member to which the magnetic attraction device 100 is attached is a socket S. As shown in Figure 18, the shaft member is a socket S formed at the tip of the handle of a socketed hammer. The socket S has an outer circumferential shape with a polygonal (hexagonal) cross section. The socket S has imaginary circumscribing circles circumscribing each corner of the polygon. In other words, the circumscribing circle is defined so that its radius is the same as the distance between the center point and each corner. Here, the dimensions and shape of the connecting portion 103 are determined so that the inner diameter of the annular portion 103b of the connecting portion 103 is at least smaller than the diameter of the circumscribing circle of the socket S. This is because if the inner diameter of the annular portion 103b is larger than the diameter of the circumscribing circle of the socket S, a sufficient crimping effect cannot be obtained. In this embodiment, the outer diameter of the annular portion 103b is also determined to be smaller than the diameter of the circumscribing circle of the socket S. As shown in Figure 18(b), the annular portion 103b of the connecting portion 103 elastically expands in diameter to conform to the irregular outer shape of the socket S and is crimped against its outer surface. Also, as shown in Figure 18(c), the socket S is inserted into the annular portion 103b until it abuts against the partition wall 103d. In other words, the partition wall 103d prevents the tip of the socket S from abutting against the magnet 105a. The elastic crimping force of the connecting portion 103 thus stably connects the magnetic attracting device 100 to the socket S. This connection can be released by forcibly moving the magnetic attracting device 100 in the axial direction away from the socket S.

Figure 19 shows a second mounting example in which the shaft member to which the magnetic attraction device 100 is attached is a pipe P. As shown in Figure 19, the shaft member is a pipe P that is circular in cross section. The pipe P is a cylindrical body with a predetermined outer diameter and a series of circles of the same outer diameter. Here, the dimensions and shape of the connecting portion 103 are determined so that the inner diameter of the annular portion 103b of the connecting portion 103 is at least smaller than the outer diameter of the pipe P. This is because if the inner diameter of the annular portion 103b is larger than the outer diameter of the pipe P, a sufficient crimping effect cannot be obtained. In this embodiment, the outer diameter of the annular portion 103b is further determined to be smaller than the outer diameter of the pipe P. As shown in Figure 19(b), the annular portion 103b of the connecting portion 103 elastically expands and deforms to follow the cylindrical pipe P with a series of circles of the same outer diameter, and is crimped to its outer surface. Furthermore, as shown in Figure 19 (c), the pipe P is inserted into the annular portion 103b until it abuts against the partition wall 103d. In other words, the partition wall 103d prevents the tip of the pipe P from abutting against the magnet 105a. That is, the magnetic attraction device 100 is stably connected to the pipe P by the elastic pressure force of the connection portion 103. This connection can be released by forcibly moving the magnetic attraction device 100 in the axial direction away from the pipe P.

In other words, the magnetic attraction device 100 can be easily attached and detached to shaft members of various shapes, and can be used with shaft members of various handle lengths. Furthermore, users can attach the magnetic attraction device 100 to a pipe or hammer for easy portability, depending on the application.

The shaft members described here are merely examples, and it goes without saying that the magnetic attraction device 100 can be connected to various types of shaft members. Preferably, the shaft member may be a rigid polyvinyl chloride electrical conduit (designation: VE16, outer diameter: 22.0 mm) specified in JIS C8430:2019. Alternatively, the shaft member may be a steel electrical conduit (designation: G16 (outer diameter: 21.0 mm) thick steel electrical conduit, designation: G19 (outer diameter: 19.1 mm) thin steel electrical conduit, or designation: E19 (outer diameter: 19.1 mm) unthreaded electrical conduit) specified in JIS C8305:2019. Furthermore, the socket size of the socket hammer may be a hexagonal socket with a 17 mm diagonal length, commonly referred to as a 3/8 socket (W3/8 socket) or M10 socket, attached to the end of the handle. In the magnetic attraction device 100 of this embodiment, the connection part 103 is configured to be compatible with both the above-mentioned three-minute socket hammer and pipes with outer diameters of 19 mm to 22 mm (VE16, G16, C19, and E19 pipes).

Next, with reference to Figure 20, we will explain the mechanism for magnetically attracting a magnetic object to the magnetic attraction section 105 and removing the magnetically attracted magnetic object from the magnetic attraction section 105 (without touching the magnetic object) in the magnetic attraction device 100 of this embodiment. As shown in Figure 20, the magnetic object is an iron piece X, but is not limited to this and can include any object such as an iron nail, iron powder, or iron sand.

As shown in Figure 20(a), when the magnetically attracted magnetic attraction device 100 attached to the shaft member is brought close to a piece of iron X lying on the ground, the magnetic force leaking out from the magnetic attraction portion 105 (action surface 113) of the magnetic attraction device 100 acts on the piece of iron X. As a result, the piece of iron X is magnetically attracted to the action surface 113, which is the outer surface of the magnetic attraction device 100. In other words, by manipulating the shaft member, the user can magnetically attract the piece of iron X lying on the ground to the outer surface of the magnetic attraction device 100 and pick it up without having to bend over. By selecting the shaft member according to the application, the user can easily magnetically attract even pieces of iron X lying in narrow, hard-to-reach places. Here, the tip of the magnetic attraction device 100 is provided with a protruding step 114, which reduces physical damage to the action surface 113 when the magnetic attraction device 100 is pressed against the ground if the magnetic object is iron powder or the like.

When the magnetic attraction device 100 is operated to demagnetize the iron piece X with the iron piece X magnetically attached to its outer surface, as shown in FIG. 20(b), the distance between the magnet 105a and the operating surface 113 increases, significantly reducing the magnetic attraction force acting on the iron piece X from the magnetically attached portion 105 (operating surface 113). This releases the iron piece X from its magnetic attachment to the magnetic attraction device 100, allowing it to freely fall from the outer surface (operating surface 113) of the magnetic attraction device 100. In other words, by simply extending the magnetic attraction device 100, the user can remove the magnetic object magnetically attached to the outer surface of the magnetic attraction device 100 without touching it with their hands. Furthermore, because the magnetic attraction device 100 can be easily detached from the shaft member, the long handle of the shaft member does not get in the way when removing the iron piece X (or iron powder). For example, it is possible to take only the magnetic attraction device 100 that magnetically attracts the iron piece X (detached from the shaft member) to a trash can and dispose of the iron piece X.

For example, when a user drills a through hole in a steel plate such as a deck plate, by performing the magnetic attraction process in Figure 20(a) and the removal process in Figure 20(b) as a series of operations, the iron powder and chips generated during the drilling process can be easily picked up and discarded. In particular, since the user can dispose of the iron powder and sharp chips without touching them, it is possible to prevent the user from getting their hands dirty or getting injured.

Next, as an application example of the magnetic attraction device 100 of this embodiment, with reference to Figures 21 to 24, a process will be described in which a magnetic object is an insert 11 and the magnetic attraction device 100 is used to fit the insert 11 into a through-hole in a deck plate Y serving as a formwork. The insert 11 is typically attached to a through-hole in a deck plate Y installed on a ceiling, and is used to support a hanging bolt for holding wiring, piping, etc. by threading it into the insert 11. In the present invention, the insert device 10 is a device for constructing an installation structure for the insert 11 on the deck plate Y (formwork) using the magnetic attraction device 100 and the insert 11 in cooperation.

As shown in Figure 21, the insert device 10 comprises a magnetic attraction device 100 and an insert 11 magnetically attached to the magnetic attraction device 100. In the insert device 10, the magnetic attraction device 100 is attached to an axial member such as a pipe or a tool handle, and functions to magnetically attach the base end of the insert 11 as a magnetic object.

The insert 11 comprises an insert body 11a, a top wall 11b, an upper clamping piece 11c, a lower clamping piece 11d, and a spring 11e. The insert body 11a is a hollow cylindrical body extending axially so as to be inserted into the through-hole of the deck plate Y, and has a threaded groove on its inner surface. The top wall 11b is a flange that extends radially outward from the base end of the insert body 11a. The top wall 11b is made of a magnetic material so as to be magnetically attracted by the magnetic attraction device 100. The upper clamping piece 11c is an annular plate that is movably fitted onto the insert body 11a, and has a first clamping surface on its lower surface that abuts against the periphery of the through-hole. The lower clamping piece 11d is a protrusion that protrudes radially outward from the insert body 11a, and has a second clamping surface on its upper surface that abuts against the periphery of the through-hole. The spring 11e is fitted onto the insert body 11a and is positioned in a compressed state between the top wall 11b and the upper clamping piece 11c. The spring 11e functions to bias the upper clamping piece 11c toward the tip. In other words, the upper clamping piece 11c, the lower clamping piece 11d, and the spring 11e are formed on the tip side of the insert body 11a and are fastening means for fastening to the periphery of the through-hole in the deck plate Y.

As shown in Figure 22, the top wall 11b of the insert 11 can be magnetically attached to the flat working surface 113 of the magnetic attraction device 100. In this magnetically attached state, the protruding step 114 is located radially outward of the top wall 11b and can engage with the side surface of the top wall 11b. In other words, the protruding step 114 can function as a restricting portion that restricts the insert 11 from sliding sideways relative to the magnetic attraction device 100.

Figure 23 shows an installation structure in which an insert 11 is installed on a deck plate Y. As shown in Figure 23, the insert body 11a passes through a through hole in the deck plate Y. The elastic force of the spring 11e clamps the periphery of the through hole between the first clamping surface of the upper clamping piece 11c and the second clamping surface of the lower clamping piece 11d, thereby securing the insert 11 to the periphery of the through hole.

Next, with reference to FIG. 24 , a method for constructing an installation structure using the insert device 10 will be described. As shown in FIG. 24 , the user connects the magnetic attraction device 100 to a long shaft member S (illustrated as a socket-equipped tool S) and magnetically attaches the insert 11 to the outer surface (working surface 113) of the tip of the magnetic attraction device 100. This allows the user to hold and manipulate the shaft member S, magnetic attraction device 100, and insert 11 as a single unit. The user then manipulates the shaft member S to press the insert 11 against the through-hole of the deck plate Y with a strong force, elastically deforming the periphery of the through-hole and forcing the insert 11 into the through-hole, as shown in FIG. 23 . During the forcing, the protruding step 114 at the tip of the magnetic attraction device 100 abuts against the side of the top wall 11b of the insert 11, thereby preventing the insert 11 from sliding sideways. This allows the user to stably transmit force through the insert device 10 and forcing the insert 11 into the through-hole. That is, the insert device 10 of this embodiment makes it possible to easily attach the insert 11 to the deck plate Y. Furthermore, because the magnetic attraction device 100 and the insert 11 are connected only by magnetic force, the magnetic attraction device 100 can be easily removed from the insert 11 after the insert 11 has been attached to the deck plate Y.

The following describes the effects of the magnetic attraction device 100 according to one embodiment of the present invention.

The magnetic attraction device 100 of this embodiment can be attached to and detached from any shaft member via the connecting portion 103 formed on the base end, and can magnetically attract a magnetic object to the outer surface of the magnetic attraction device 100 at a position distal to the connecting portion 103 using the magnetic attraction portion 105. In other words, the magnetic attraction device 100 can be detachably attached to any shaft member depending on the situation, and the desired magnetic attraction force can be applied to the shaft member. Furthermore, the magnetic attraction device 100 includes an exterior body 110 that has an action surface 113 that externally covers the magnetic attraction portion 105 (magnet 105a) and is movably supported on the attraction device main body 101. When the exterior body 110 is in a reference position relative to the attraction device main body 101, a magnetic object can be magnetically attracted to the action surface 113. Meanwhile, when the exterior body 110 is displaced from the reference position to a separated position, the magnetic attraction force at the action surface 113 weakens. This allows the magnetic attraction device 100 to selectively create a situation in which a magnetic object is not attracted to the outer surface or is easily attracted. In other words, by operating the magnetic attraction device 100, it is possible to easily remove a magnetic object magnetically attracted to the action surface 113 from the magnetic attraction device 100 without touching it with one's hands. Therefore, the magnetic attraction device 100 of this embodiment significantly improves convenience in magnetic attraction applications using a shaft member.

The present invention is not limited to the above-described embodiment, and various other embodiments and modifications are possible. Below, other embodiments of the present invention are described. In each embodiment, components that share the same last two digits of a reference number have the same or similar characteristics, unless otherwise specified, and some of their descriptions will be omitted.

(1) The magnetic attraction device of the present invention is not limited to the above embodiment and can take various forms. In the magnetic attraction device of the above embodiment, the connection portion is formed as an elastically deformable ring-shaped body, but the present invention is not limited to the above embodiment. The magnetic attraction device 200 in Figure 25 has a connection portion 203 made of a solid elastic body. The connection portion 203 is formed in a cylindrical shape with dimensions that allow it to be press-fitted into the socket hole of the shaft member (socket S). The socket S has an imaginary inscribed circle inscribed in each side of a polygon. The outer diameter of the connection portion 203 is set to be larger than the diameter of the inscribed circle. As shown in Figures 25(b) and (c), the connection portion 203 deforms to follow the hexagonal shape of the inner surface of the socket S, thereby pressing against the inner surface of the hole of the socket S and connecting to the socket S. In other words, the magnetic attraction device 200 is stably connected to the socket S due to the elastic pressure force of the connection portion 203. This connection can be released by forcibly moving the magnetic attraction device 200 in the axial direction away from the socket S.

(2) The magnetic attracting device of the present invention is not limited to the above embodiment and can take various forms. In the magnetic attracting device of the above embodiment, the connecting portion utilizes elastic pressure contact force, but the present invention is not limited to the above embodiment. The connecting portion may be configured as a screwing means having an external or internal thread, in which case the shaft member has a corresponding threaded portion. By using a connection by a screwing means, it is possible to more firmly connect the magnetic attracting device to the shaft member. Furthermore, the connecting portion may be polygonal in shape to fit into a polygonal hole in the socket of the shaft member. Alternatively, the connecting portion may be connected to the shaft member by a locking metal fitting.

(3) The magnetic attraction device of the present invention is not limited to the above embodiment and can take various forms. In the magnetic attraction device of the above embodiment, the exterior body is configured as a cylindrical sliding body with a bottom, but the present invention is not limited to the above embodiment. The magnetic attraction device 300 of Figure 26 comprises an attraction device main body 301 and an exterior body 310 that has an action surface 313 that covers the magnetic attraction portion 305 (magnet 305a) from the outside and is movably supported on the attraction device main body 301. The exterior body 310 is displaceable between a reference position in which a magnetic object can be magnetically attracted to the action surface 313 by the magnetic force from the magnetic attraction portion 305, and a separated position in which the action surface 313 is separated relatively from the magnetic attraction portion 305. In this embodiment, the exterior body 310 is a lid connected to the attraction device main body 301 by a hinge. The closed state of the lid as the exterior body 310 is the reference position, and the open position of the lid is the separated position. As shown in Figure 26(a), when the exterior body 310 is in the reference position, the iron piece X, which serves as the magnetic object, is magnetically attached to the action surface 313. As shown in Figure 26(b), when the exterior body 310 is operated by the user and the exterior body 310 is in the separated position, the iron piece X falls freely from the action surface 313. In other words, the user can remove the magnetic object magnetically attached to the outer surface of the magnetic attraction device 300 from the magnetic attraction device 300 without touching it with their hands, simply by opening the magnetic attraction device 300.

(4) The magnetic attraction device of the present invention is not limited to the above embodiment and can take various forms. In the magnetic attraction device of the above embodiment, the exterior body is configured as a cylindrical sliding body with a bottom, but the present invention is not limited to the above embodiment. The magnetic attraction device 400 of Figure 27 includes an attraction device main body 401 and an exterior body 410 that has an action surface 413 that covers the magnetic attraction portion 405 (magnet 405a) from the outside and is movably (detachably) supported on the attraction device main body 401. The exterior body 410 is displaceable between a reference position in which a magnetic object can be magnetically attracted to the action surface 413 by the magnetic force from the magnetic attraction portion 405, and a separated position in which the action surface 413 is relatively separated from the magnetic attraction portion 405. In this embodiment, the exterior body 410 is a cap fitted to the attraction device main body 401. The state in which the cap is fitted as the exterior body 410 is the reference position, and the position in which the cap is removed is the separated position. As shown in Figure 27(a), when the exterior body 410 is in the reference position, the iron piece X, which serves as the magnetic object, is magnetically attached to the action surface 413. As shown in Figure 27(b), when the exterior body 410 is operated by the user and the exterior body 410 is in the separated position, the iron piece X falls freely from the action surface 413. In other words, the user can remove the magnetic object magnetically attached to the outer surface of the magnetic attraction device 400 from the magnetic attraction device 400 without touching it with their hands, simply by performing a separation operation on the magnetic attraction device 400.

(5) The magnetic attraction device of the present invention is not limited to the above embodiment and can take various forms. In the magnetic attraction device of the above embodiment, the exterior body is configured as a cylindrical sliding body with a bottom, but the present invention is not limited to the above embodiment. The magnetic attraction device 500 of Figure 28 comprises an attraction device main body 501 and an exterior body 510 that has an action surface 513 that covers the magnetic attraction portion 505 (magnet 505a) from the outside and is movably supported on the attraction device main body 501. The exterior body 510 is displaceable between a reference position where a magnetic object can be magnetically attracted to the action surface 513 by the magnetic force from the magnetic attraction portion 505, and a separated position where the action surface 513 is separated relatively from the magnetic attraction portion 505. In this embodiment, the exterior body 510 is screwed to the attraction device main body 501. A threaded portion is provided on the outer surface of the peripheral wall portion 502 of the attraction device main body 501, and a threaded portion is provided on the outer surface of the cylindrical wall 511 of the exterior body 510. The state in which the exterior body 510 is screwed onto the base end is the reference position, and the position in which the exterior body 510 is screwed toward the tip end is the separated position. As shown in FIG. 28(a), when the exterior body 510 is in the reference position, a piece of iron X as a magnetic object is magnetically attached to the action surface 513. As shown in FIG. 28(b), when the exterior body 510 is screwed by the user and the exterior body 510 is in the separated position, the piece of iron X falls freely from the action surface 513. In other words, by simply extending the magnetic attraction device 500, the user can remove the magnetic object magnetically attached to the outer surface of the magnetic attraction device 500 from the magnetic attraction device 500 without touching it with their hands.

(6) The magnetic attraction device of the present invention is not limited to the above embodiment and can take various forms. The magnetic attraction device does not have to have an outer casing. In other words, even in a magnetic attraction device of this type, the attraction device main body having a magnetically attracting portion is connected to the shaft member via the connecting portion, so that it is at least possible to magnetically attract a magnetic object and impart a desired magnetic attraction force to the shaft member.

(7) The magnetic attraction device of the present invention is not limited to the above embodiment and can take various forms. In the above embodiment, the magnetic attraction device is formed into a hollow cylindrical shape extending in the axial direction, but the present invention is not limited to this. For example, the magnetic attraction device may be solid. Furthermore, the magnetic attraction device may be arbitrarily bent or curved, such as into an L-shape.

The present invention is not limited to the above-described embodiments and variations, and can be implemented in various forms as long as they fall within the technical scope of the present invention.

10 Insert device 11 Insert (magnetic object)
11a Insert main body 11b Top wall 11c Upper clamping piece (fixing means)
11d Lower clamping piece (fixing means)
11e Spring (fixing means)
100 Magnetic attraction tool 101 Attraction tool body 102 Peripheral wall portion 102a Protrusion 103 Connection portion 103a Opening 103b Annular portion 103c Joint portion 103d Partition wall (restriction portion)
105 Magnetically attracted portion 105a Magnet 105b Magnet holding portion 106 Guide groove 107 First locking claw (locking means)
108 Second locking claw (locking means)
109 Introduction groove 110 Exterior body 111 Cylindrical wall 112 Bottom wall 113 Working surface 114 Projecting step portion 115 Engagement convex portion (locking means)
116 Grip portion 117 Display portion S Socket (shaft member)
P Pipe (shaft member)
X Iron piece (magnetic object)
Y Deck plate (formwork)

Claims (1)

a magnetic attracting tool having a flat surface at a tip end for magnetically attracting a magnetic object, the magnetic attracting tool being detachably attached to the shaft member, and for magnetically attracting the magnetic object;
an insert comprising: an insert body extending in an axial direction so as to be inserted into a through-hole of a form; a top wall made of a magnetic material formed at a base end of the insert body and magnetically attachable to the flat surface of the magnetic attraction device; and a fastening means formed at a tip end side of the insert body for fastening to the periphery of the through-hole of the form;
The magnetic attraction tool is
a suction tool body extending from a base end to a tip end;
a connecting portion formed on a base end side of the suction tool body for detachably connecting the tip of the shaft member;
a magnetic attraction portion that exerts a magnetic force on the outside of the suction tool body to magnetically attract a magnetic object to the outer surface of the magnetic attraction tool at a position closer to the tip end than the connection portion of the suction tool body,
An insert device characterized in that the flat surface of the magnetic attraction tool forms a portion that continues to the outer edge, and a protruding step portion is provided on a portion of the flat surface to restrict lateral sliding of the insert that is magnetically attracted to the magnetic attraction tool.