JP7012757B2 - Magnetic sleeve - Google Patents

Description

The present invention relates to a magnetic sleeve.

The sleeve is attached to the tip of the handle to form a socket driver and is commonly used for assembling and removing fixing members such as bolts, nuts and screw nails, for construction, automobile repair or furniture. It is used in many fields such as assembly.
However, in order to speedily lock the fixing member and at the same time prevent the fixing member from shaking excessively in the joining process, when the fixing member is long, the user holds the fixing member or the like in the joining process. There was a drawback that it had to be assisted by. Therefore, a magnetic sleeve that assists in fixing the fixing member by magnetism has been researched and developed.

As shown in FIGS. 1A and 1B, the known magnetic sleeve 1 has a sleeve main body 11 and a magnetic member 12 provided inside the sleeve main body 11.
The sleeve body 11 communicates with the fitting step 111 provided on one end side, the connecting step 112 provided on the other end side, the fastening hole 113 formed in the connecting step 112, and the fastening hole 113, and is a magnetic member 12. It has mounting holes 114 that match the size.
The magnetic member 12 is formed by press-mold sintering and has a hard and brittle property. When the direct extrusion method is adopted and the magnetic member 12 is mounted in the mounting hole 114, the air in the mounting hole 114 cannot be discharged to the outside, the air in the mounting hole 114 is extruded, and a repulsive force is generated to generate the magnetic member. 12 may be pushed and the magnetic member 12 may be pushed and broken.

Therefore, the outer peripheral surface of the magnetic member 12 is usually covered with a soft protective member 13. A plurality of concave tanks 131 are installed on the outer periphery of the protective member 13. In the process of installing the magnetic member 12, the air in the mounting hole 114 is discharged to the outside through the concave tank 131, and the magnetic member 12 is not pushed out.
However, the installation of the protective member 13 not only requires another cost, but also increases the number of steps because the magnetic member 12 can be installed in the protective member 13 in advance and then the subsequent installation work can be performed. , Not economical.

The other known magnetic sleeves 2 shown in FIGS. 2A and 2 have a sleeve body 21 and a magnetic member 22 mounted inside the sleeve body 21.
The sleeve body 21 has a fitting step 211 on one end side, a connecting step 212 on the other end side, a fastening hole 213 formed in the connecting step 212, and a mounting hole 214 communicating with the fastening hole 213. The above-mentioned mounting hole 214 is formed into a hexagon by combining six contact surfaces 2141. Further, in the cross section, when each contact surface 2141 extends in the tangential direction to the outer peripheral surface of the magnetic member 22 and is in contact with the adjacent contact surface 2141 at only one point, when the magnetic member 22 is mounted in the mounting hole 214, The magnetic member 22 is pressed by a plurality of contact surfaces 2141 to form a gap between the magnetic member 22 and the mounting hole 214, so that the air in the mounting hole 214 is easily discharged to the outside.

When the magnetic sleeve 2 is actually used, the contact surface 2141 of the mounting hole 214 can hold and fix the magnetic member 22 between the plurality of contact surfaces 2141 only when the magnetic member 22 is closely fitted with the magnetic member 22. However, since the six contact surfaces 2141 are directly press-molded, a slight change in size is likely to occur in the press-molding process, and due to the size tolerance of the magnetic member 22, when the magnetic member 22 is mounted, a plurality of hits are likely to occur. There is a drawback that the magnetic member 22 cannot be firmly localized and loosens because it cannot be pinched by the contact surface 2141.

If the size of the magnetic member 22 is made slightly larger than the size of the mounting hole 214, the magnetic member 22 is tightly pressed by the plurality of contact surfaces 2141, and the plurality of contact surfaces 2141 are excessively contacted during the mounting process of the magnetic member 22. As a result, the magnetic member 22 is easily worn.
Further, if the gap formed between the magnetic member 22 and the contact surface 2141 of the mounting hole 214 is too large, the magnetic member 22 comes into contact with the outside air over a large area to accelerate oxidation, and the magnetic member 22 Not only does the magnetism decline in a short period of time, but it also affects the service life of the magnetic sleeve 2, and a large amount of metal debris tends to accumulate due to the excessive gap, which indirectly affects the effect of the magnetic attraction of the magnetic member 22. affect.
This magnetic sleeve 2 has improved the problem when the protective member 13 of the magnetic sleeve 1 described above is added, but the plurality of contact surfaces 2141 must be perfectly aligned with the magnetic member 22 and further. Since the level of processing difficulty becomes high and the cost becomes high, further improvement is required.

The problem to be solved by the present invention is that there is no concern that the magnetic member will be pushed out and broken when it is mounted, and at the same time, the gap generated between the mounting hole and the outer peripheral surface of the magnetic member is minimized to minimize the magnetic member. The purpose is to provide a magnetic sleeve that can be firmly fixed.

The invention according to claim 1 of the present application has a sleeve main body and a circular magnetic member provided inside the sleeve main body, and the sleeve main body is a magnetic sleeve used for assembling and removing the fixing member . A fitting step that can be fitted to a handle provided on one end side, a connecting step provided on the other end side, a fastening hole formed inside the connecting step, and a fastening hole for mounting the fixing member, and the fastening hole. It has a mounting hole for installing the magnetic member that communicates and magnetically magnetizes the fixing member, and the inner peripheral surface of the mounting hole is formed so as to surround the reference point, and the inner peripheral surface of the mounting hole is formed. Is formed by a joint surface and a holding surface, and in the cross section of the inner peripheral surface, the holding surface forms two intersections with the joining surface, and the joining surface between the two intersections sandwiching the holding surface. Is formed in an arc shape, the holding surface is located closer to the reference point than the joining surface, and the diameter of the magnetic member passes from the joining surface to the reference point and is the center point of the holding surface. By installing the magnetic member so as to be in contact with the joint surface of the mounting hole and the holding surface, a gap is created between the outer peripheral surface of the magnetic member and the inner peripheral surface of the mounting hole. It is a magnetic sleeve characterized by being formed .

The invention according to claim 2 of the present application is the magnetic sleeve according to claim 1, wherein the holding surface is a flat surface.

The invention according to claim 3 of the present application has a sleeve main body and a circular magnetic member provided inside the sleeve main body, and the sleeve main body is provided on one end side in a magnetic sleeve for assembling and removing the fixing member. A fitting step that can be fitted to the handle, a connecting step provided on the other end side, a fastening hole formed inside the connecting step, and a fastening hole for mounting the fixing member, and communicating with the fastening hole and said . It has a mounting hole for mounting the magnetic member for magnetically adhering the fixing member, the inner peripheral surface of the mounting hole is formed so as to surround the reference point, and the inner peripheral surface of the mounting hole is at least two. It is formed by one connecting surface and at least two holding surfaces , and in the cross section of the inner peripheral surface , each holding surface forms two intersections with two connecting surfaces of the at least two connecting surfaces, and each connection is formed. The surfaces are formed in an arc shape, each of the holding surfaces is formed so as to be located closer to the reference point than each of the connecting surfaces, and the radius of the magnetic member is at least two holding surfaces from the reference point. By installing the magnetic member so as to be in contact with each of the holding surfaces of the at least two holding surfaces, which is equal to the distance to the center point of each holding surface of the magnetic member, the outer peripheral surface of the magnetic member and the inner peripheral surface of the mounting hole are installed. It is a magnetic sleeve characterized in that a gap is formed between the two .

The invention according to claim 4 of the present application is the magnetic sleeve according to claim 3, wherein the holding surface is a flat surface.

According to the present invention, the magnetic member is firmly localized on the holding surface, and a gap for discharging air is created between the magnetic member and the mounting hole, so that the magnetic member is pushed and broken when it is mounted inside the mounting hole. By preventing the magnetic member from staying in the gap and limiting the gap to the minimum, the magnetic attraction effect of the magnetic member is maintained, the area where the magnetic member and the outside air come into contact is reduced, and the magnetic member The oxidation rate can be delayed.

A known magnetic sleeve is shown, (A) is a perspective view, and (B) is an end view. Other known magnetic sleeves are shown, (A) is a perspective view, and (B) is an end view. It is a perspective view of the magnetic sleeve which shows the 1st Embodiment of this invention. It is an exploded end view of the magnetic sleeve which shows the 1st Embodiment of this invention. It is an end view of the magnetic sleeve which shows the 1st Embodiment of this invention. It is a side view which showed the 1st Embodiment of this invention by breaking a part in the use state of the magnetic sleeve. It is an exploded end view of the magnetic sleeve which shows the 2nd Embodiment of this invention. It is an end view of the magnetic sleeve which shows the 2nd Embodiment of this invention. It is an end view of the magnetic sleeve which shows the 3rd Embodiment of this invention. It is an end view of the magnetic sleeve which shows the 4th Embodiment of this invention. It is an end view of the magnetic sleeve which shows the 5th Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Needless to say, the present invention is not limited to the embodiments.

Hereinafter, the first embodiment of the present invention will be described together with FIGS. 3 to 6.
As shown in FIGS. 3 and 4, the magnetic sleeve 3 has a sleeve main body 31 and a magnetic member 32 provided inside the sleeve main body 31.
The sleeve body 31 is formed at the bottom of the fitting step 311 provided on one end side, the connecting step 312 provided on the other end side, the fastening hole 313 formed inside the connecting step 312, and the fastening hole 313, and is tightened. It has a mounting hole 314 that communicates with the landing hole 313.

As shown in FIG. 4, the mounting hole 314 is formed by surrounding it in a substantially circular shape with the reference point L as the center. Further, a flat holding surface 315 located inside the other portion is formed on a part of the inner peripheral surface of the mounting hole 314. In the cross section, the holding surface 315 and the inner peripheral surface of the mounting hole 314 form two intersections P, and the joint surface P1 between the two intersections P sandwiching the holding surface 315 on the inner peripheral surface of the mounting hole 314 is a circle. It forms an arc.
The diameter 32D of the magnetic member 32 is equal to the distance 314D from the inner peripheral surface of the mounting hole 314 to the center point of the sandwiching surface 315 through the reference point L, and when the magnetic member 32 is placed in the mounting hole 314, the figure is shown. As shown in 5, the magnetic member 32 is tightly pressed by the holding surface 315, and a gap is formed between the outer peripheral surface of the magnetic member 32 and the inner peripheral surface of the mounting hole 314.

As shown in FIGS. 4 and 5, when the magnetic member 32 is installed, a force is applied to the magnetic member 32 to push the magnetic member 32 and move it in the mounting hole 314 direction.
At this time, the diameter 32D of the magnetic member 32 is equal to the distance 314D from the inner peripheral surface of the mounting hole 314 to the center point of the sandwiching surface 315 passing through the reference point L, and the diameter of the magnetic member 32 is set from the diameter of the mounting hole 314. It's a little smaller. Further, by making the difference between the diameter of the magnetic member 32 and the diameter of the mounting hole 314 extremely small, the gap generated between the mounting hole 314 and the peripheral surface of the magnetic member 32 is minimized, and the magnetic member 32 is mounted on the mounting hole. When mounting in 314, the air in the mounting hole 314 is smoothly discharged to the outside from the gap, effectively preventing the magnetic member 32 from being pushed and broken when mounted, and at the same time minimizing the gap. By reducing the size to the space, it is possible to prevent the accumulation of metal debris, reduce the area where the magnetic member 32 and the outside air come into contact, and delay the oxidation rate of the magnetic member 32, thereby increasing the magnetic attraction effect of the magnetic member 32. To improve.
Further, by making the holding surface 315 a flat surface, the outer periphery of the magnetic member 32 can be effectively and firmly pressed, and the magnetic member 32 can be stably fixed.

As shown in FIG. 6, with the magnetic member 32 firmly fixed to the mounting hole 314, the user fits the handle (not shown in the figure) into the fitting step 311 and mounts the fixing member 4 in the fastening hole 313. Then, the fixing member 4 is assembled and removed using the magnetic sleeve 3.
Since the magnetic member 32 of the magnetic sleeve 3 has magnetism, it becomes easy to effectively localize the fixing member 4, and not only does it not shake excessively in the process of fixing the fixing member 4, but also the user fixes the fixing member 4 by hand. There is no need to do this, and the fixing member 4 can be assembled and removed speedily.

Hereinafter, the second embodiment according to the present invention will be described together with FIGS. 7 and 8. The same parts as in the first embodiment will be omitted, and different parts will be mainly described.
Two planar sandwiching surfaces 315 facing each other are formed on the inner peripheral surface of the mounting hole 314. In the cross section, each holding surface 315 and the inner peripheral surface of the mounting hole 314 form two intersections P, and the connecting surface 3151 between the two holding surfaces 315 on the inner peripheral surface of the mounting hole 314 is arcuate.
The radius 32R of the magnetic member 32 is equal to the distance 315D from the reference point L to the center point of one sandwiching surface 315, and the air in the mounting hole 314 is formed between the outer peripheral surface of the magnetic member 32 and the inner peripheral surface of the mounting hole 314. It is easy to discharge to the outside through the gap, and the drawback that the magnetic member 32 is broken by the pressure received at the time of installation is greatly improved. And fix it.

As a matter of course, as in the third embodiment shown in FIG. 9, three planar sandwiching surfaces 315 may be formed on the inner peripheral surface of the mounting hole 314 at equal intervals in the circumferential direction.
Further, as in the fourth embodiment shown in FIG. 10, the peripheral edge of the mounting hole 314 may be formed with four holding surfaces 315 inward, and as in the fifth embodiment shown in FIG. The peripheral edge of the mounting hole 314 may be formed with six holding surfaces 315 inward.
In this way, by increasing the number of the holding surfaces 315 installed, the magnetic member 32 can be fixed more firmly.

As described above, in the magnetic sleeve of the present invention, at least one holding surface is formed on the inner peripheral surface of the mounting hole, and two intersections are formed on the holding surface and the inner peripheral surface of the mounting hole, and the diameter of the magnetic member is formed. Is equal to the distance from the inner peripheral surface of the mounting hole through the reference point to the holding surface, and the joint surface between the two intersections is formed in an arc shape. When at least two holding surfaces are provided in the mounting holes, the radius of the magnetic member is equal to the distance of one holding surface from the reference point, and the connecting surface between any two holding surfaces is arcuate. As a result, when the magnetic member is mounted inside the mounting hole, a gap is created between the peripheral edge of the magnetic member and the mounting hole for discharging air, and at the same time, by limiting the gap to the minimum, metal waste is further contained in the gap. It improves the retention of the magnetic member, maintains the magnetic attraction effect of the magnetic member, and at the same time reduces the area where the magnetic member and the outside air come into contact with each other, and further delays the oxidation rate of the magnetic member.
In addition, the magnetic member is effectively and tightly pressed together with the holding surface to achieve firm localization of the magnetic member.

The above is merely a description of the embodiments of the present invention, does not limit the scope of rights of the present invention, and all changes and modifications that do not deviate from the claims are included in the scope of rights of the present invention.

(Public example)
1 Magnetic sleeve 11 Sleeve body 12 Magnetic member 13 Protective member 111 Fitting step 112 Connecting step 113 Tightening hole 114 Mounting hole 131 Concave tank 2 Magnetic sleeve 21 Sleeve body 211 Fitting step 212 Connecting step 213 Tightening hole 214 Mounting hole 2141 Contact surface 22 Magnetic member (embodiment of the present invention)
3 Magnetic sleeve 31 Sleeve body 311 Fitting step 312 Connecting step 313 Tightening hole 314 Mounting hole 314D Distance from the inner peripheral surface of the mounting hole 314 to the holding surface through the reference point 315 Holding surface 3151 Connection surface 315D From the reference point Distance to the holding surface 32 Magnetic member 32D Magnetic member diameter 32R Magnetic member radius 4 Fixed member L Reference point P Intersection point P1 Joint surface

Claims (4)

In a magnetic sleeve that has a sleeve body and a circular magnetic member provided inside the sleeve body and is used for assembling and removing the fixing member .
The sleeve body is
A fitting step that can be fitted to the handle provided on one end side, a connecting step provided on the other end side, a fastening hole formed inside the connecting step, and a fastening hole for mounting the fixing member, and the fastening hole. It has a mounting hole for installing the magnetic member that communicates and magnetizes the fixing member .
The inner peripheral surface of the mounting hole is formed so as to surround the reference point, and the inner peripheral surface of the mounting hole is formed by a joint surface and a holding surface .
In the cross section of the inner peripheral surface, the sandwiching surface forms two intersections with the joint surface .
The joint surface between the two intersections sandwiching the holding surface is formed in an arc shape.
The sandwiching surface is located closer to the reference point than the joint surface.
The diameter of the magnetic member is equal to the distance from the joint surface through the reference point to the center point of the sandwiching surface.
By installing the magnetic member so as to be in contact with the joint surface of the mounting hole and the holding surface, a gap is formed between the outer peripheral surface of the magnetic member and the inner peripheral surface of the mounting hole. Magnetic sleeve. The magnetic sleeve according to claim 1, wherein the holding surface is a flat surface. In a magnetic sleeve that has a sleeve body and a circular magnetic member provided inside the sleeve body, and is used for assembling and removing the fixing member .
The sleeve body is
A fitting step that can be fitted to the handle provided on one end side, a connecting step provided on the other end side, a fastening hole formed inside the connecting step, and a fastening hole for mounting the fixing member, and the fastening hole. It has a mounting hole for installing the magnetic member that communicates and magnetizes the fixing member .
The inner peripheral surface of the mounting hole is formed so as to surround the reference point, and the inner peripheral surface of the mounting hole is formed by at least two connecting surfaces and at least two holding surfaces .
In the cross section of the inner peripheral surface , each sandwiching surface forms two intersections with two connecting surfaces of the at least two connecting surfaces .
Each connecting surface is formed in an arc shape,
Each of the holding surfaces is formed so as to be located closer to the reference point than each of the connecting surfaces.
The radius of the magnetic member is equal to the distance from the reference point to the center point of each holding surface of the at least two holding surfaces.
By installing the magnetic member so as to be in contact with each of the holding surfaces of the at least two holding surfaces, a gap is formed between the outer peripheral surface of the magnetic member and the inner peripheral surface of the mounting hole. Magnetic sleeve. The magnetic sleeve according to claim 3, wherein the holding surface is a flat surface.

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