JP2021112796A - Magnetic sleeve - Google Patents

Abstract

To provide a magnetic sleeve that can firmly fix a magnetic member while minimizing a gap between a mounting hole and the magnetic member with no concern of the magnetic sleeve being pushed out and broken during mounting.SOLUTION: A sleeve body 31 has a fitting step 311 on one end side, a connecting step 312 on the other end side, a fastening hole 313 inside the connecting step 312, and a mounting hole 314 for installing a magnetic member 32 communicating with the fastening hole 313. An inner peripheral surface of the mounting hole 314 is formed by surrounding a reference point. A holding surface 315 is formed on the inner peripheral surface of the mounting hole 314. In the cross section, two intersections are formed on the inner peripheral surface of the holding surface 315 and the mounting hole 314. A joint surface between the two intersections that sandwich the holding surface 315 has an arcuate shape. The holding surface 315 forms a string connecting the two intersections. The diameter of the magnetic member 32 is equal to the distance from the inner peripheral surface of the mounting hole 314 to the holding surface 315 through the reference point.SELECTED DRAWING: Figure 3

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 assembly. It is used in many fields such as.
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 magnetic member 12 and communicates with the fastening hole 113. It has mounting holes 114 that match the size of each other.
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 is 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 circumference 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 with respect 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 be fixed by sandwiching 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 hit surfaces are hit. There is a drawback that the magnetic member 22 cannot be firmly localized and loosens because it cannot be sandwiched 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 come into excessive contact 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 magnetic attraction of the magnetic member 22. affect.
The magnetic sleeve 2 has improved the problem when the protective member 13 of the magnetic sleeve 1 is added, but the plurality of contact surfaces 2141 must be perfectly aligned with the magnetic member 22 and further. Since the processing difficulty level 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 is a magnetic sleeve having a sleeve body and a magnetic member provided inside the sleeve body, wherein the sleeve body is a fitting step that can be fitted to a handle provided on one end side and the other end side. It has a connecting step provided in the above, a fastening hole formed inside the connecting step, and a mounting hole that communicates with the fastening hole and for installing the magnetic member, and the inner peripheral surface of the mounting hole is a reference point. A 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 in the cross section. The joint surface between the two intersections that sandwich the sandwiching surface on the inner peripheral surface of the magnetic member is formed in an arc shape, and the diameter of the magnetic member passes through the reference point from the inner peripheral surface of the mounting hole and is sandwiched. A magnetic sleeve characterized by being equal to the distance to a surface.

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 is a magnetic sleeve having a sleeve body and a magnetic member provided inside the sleeve body, wherein the sleeve body is a fitting stage that can be fitted to a handle provided on one end side and the other end side. It has a connecting step provided in the above, a fastening hole formed inside the connecting step, and a mounting hole that communicates with the fastening hole and for installing the magnetic member, and the inner peripheral surface of the mounting hole is a reference point. At least two holding surfaces are formed on the inner peripheral surface of the mounting hole, and two intersections are formed on each holding surface and the inner peripheral surface of the mounting hole in the cross section. The connecting surface between any two holding surfaces on the inner peripheral surface of the mounting hole is formed in an arc shape, the holding surface forms a string connecting the two intersections, and the radius of the magnetic member is the reference. It is a magnetic sleeve characterized by being equal to the distance from a point to one holding surface.

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 metal scraps do not stay in the gap, 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 rate of oxidation can be slowed down.

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 partially broke the magnetic sleeve which shows the 1st Embodiment of this invention in the use state. 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 with reference to 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 in 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 bottom of the fastening hole 313 for tightening. It has a mounting hole 314 that communicates with the ringing 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 through the reference point L to the center point of the holding surface 315, 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 through the reference point L, and the diameter of the magnetic member 32 is larger than the diameter of the mounting hole 314. It is a little smaller. Further, by making the difference between the diameter of the magnetic member 32 and the diameter of the mounting hole 314 very 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 mounted in 314, the air in the mounting hole 314 is smoothly discharged to the outside through 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 further prevent the accumulation of metal scraps, 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 causing the magnetic attraction effect of the magnetic member 32. To improve.
Further, by making the holding surface 315 flat, the outer circumference 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) into the fitting step 311 and mounts the fixing member 4 in the fastening hole 313. , The magnetic sleeve 3 is assembled and removed from the fixing member 4.
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 work of assembling and removing the fixing member 4 can be performed 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 flat 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 defect that the magnetic member 32 is broken by the pressure received at the time of installation is greatly improved. And fix it.

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, four sandwiching surfaces 315 may be formed inward on the peripheral edge of the mounting hole 314, and as in the fifth embodiment shown in FIG. Six sandwiching surfaces 315 may be formed inward on the peripheral edge of the mounting hole 314.
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 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 the 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 scraps are 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 scope of 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 stage 312 Connecting stage 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 P1 Joint surface

Claims (4)

In the sleeve body and the magnetic sleeve having a magnetic member provided inside the sleeve body,
The sleeve body communicates with 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 the fastening hole. It has a mounting hole for installing a magnetic member, the inner peripheral surface of the mounting hole is formed so as to surround the reference point, and a holding surface is formed on the inner peripheral surface of the mounting hole. Two intersections are formed on the holding surface and the inner peripheral surface of the mounting hole, and the joint surface between the two intersections sandwiching the holding surface on the inner peripheral surface of the mounting hole is formed in an arc shape.
A magnetic sleeve characterized in that the diameter of the magnetic member is equal to the distance from the inner peripheral surface of the mounting hole to the holding surface through the reference point. The magnetic sleeve according to claim 1, wherein the holding surface is flat. In the sleeve body and the magnetic sleeve having a magnetic member provided inside the sleeve body,
The sleeve body communicates with 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 the fastening hole. It has a mounting hole for mounting a magnetic member, the inner peripheral surface of the mounting hole is formed so as to surround the reference point, and at least two sandwiching surfaces are formed on the inner peripheral surface of the mounting hole. In the cross section, two intersections are formed on each holding surface and the inner peripheral surface of the mounting hole, and the connecting surface between any two holding surfaces on the inner peripheral surface of the mounting hole is formed in an arc shape.
A magnetic sleeve characterized in that the radius of the magnetic member is equal to the distance from the reference point to one holding surface. The magnetic sleeve according to claim 3, wherein the holding surface is flat.

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