WO2017109938A1

WO2017109938A1 - Fixing implement magnetic attachment assistance tool and electric screwdriver

Info

Publication number: WO2017109938A1
Application number: PCT/JP2015/086227
Authority: WO
Inventors: 秀雄中庄谷
Original assignee: 光和管財株式会社
Priority date: 2015-12-25
Filing date: 2015-12-25
Publication date: 2017-06-29
Also published as: JPWO2017109938A1; JP6085740B1

Abstract

Provided are: a fixing implement magnetic attachment assistance tool with which not only iron but also stainless steel fixing implements can be magnetically attached to the tip of a screwdriver bit by inserting the bit and magnetizing same; and an electric screwdriver using said tool. The fixing implement magnetic attachment assistance tool is provided with: a magnetic attachment assistance tool body A in which multiple permanent magnets 21 are formed in a petaloid cylinder by joining the permanent magnets 21 with the ends of the same polarity adjacent to each other in a bundle without gaps so that a hollow through hole 13 is formed in the center; and a magnetic force - reinforcing member 50 made of a cylindrical ferromagnetic body with a smaller diameter than the magnetic attachment assistance tool body A. For the multiple permanent magnets 21: the direction of magnetization is regulated so that the lines of magnetic force point toward the tip 41 at an inclined angle with respect to the axis line of a screwdriver bit 40 that is inserted in the hollow through hole 13; and the magnetic force lines are made to pass through the magnetic force-reinforcing member 50, through which the screwdriver bit 40 is inserted so that the reinforcing member is adjacent to the magnetic attachment assistance tool body A on the tip-side thereof .

Description

Magnetic attachment aid for fasteners and electric driver

The present invention uses a magnetic attachment aid for fasteners, in which iron and stainless fasteners are adsorbed to the tip by inserting and removing a driver bit or the like, and using the magnetic attachment aids for the fasteners. It relates to a motorized driver.

As a conventional magnetic attachment aid for fasteners, there is, for example, one described in Patent Document 1 below.

In this auxiliary tool, a neodymium magnet is formed in the shape of two half rings, and a space is provided between the two magnets in a ring shape, and a driver bit is inserted into the central space (hollow through hole), The shaft portion is magnetized, and a rotary fixing tool such as a screw is adsorbed and held on the tip of the driver bit.

JP 2004-141986 A

However, the above-mentioned document uses fasteners such as iron screws for attachment, and is strong enough to adsorb and hold fasteners such as stainless steel screws at the tip of the driver bit of the motorized driver. It is not possible to obtain a magnetic force.

Particularly in recent times, fixing tools such as iron are rusted and corroded, so they are not suitable for outdoor buildings etc., and stainless steel screws are often used, and stainless steel screws It is desirable to develop a magnetic attachment aid that can be held by suction on the tip of a driver bit, as with iron screws.

The present invention has been proposed in consideration of such circumstances, and its object is to magnetically magnetize the tip of the driver bit so that the tip of the driver bit can be strongly magnetized and magnetically attached even with a stainless steel fastener. To provide aids.

In order to achieve the above object, the magnetic attachment aid for fasteners of the present invention is a magnetic attachment aid for fasteners used by inserting a driver bit, and a plurality of permanent magnets are hollow in the center A magnetic attachment aid main body formed in a petal-like cylindrical body by joining end portions of the same polarity of adjacent permanent magnets in a bundle without gaps so that a through hole is formed, and magnetic attachment A magnetic material reinforcing member made of a cylindrical ferromagnetic material attached to the front end side of the auxiliary tool main body and adapted to insert the driver bit is provided, and a plurality of permanent magnets are inserted into the hollow through holes. The magnetization direction is defined so that the magnetic lines of force are directed toward the tip with an inclination angle with respect to the axis line of the driver bit to be passed, and the magnetic force reinforcing material is allowed to pass through.

In the present invention, a cushioning material may be interposed on the end face of each of the plurality of permanent magnets opposite to the hollow through hole.

Furthermore, the petaloid tubular body may have a regular n-gon shape.

Furthermore, the permanent magnet may be configured such that a chamfering joint surface is formed on adjacent side surfaces between the magnets.

Furthermore, an auxiliary permanent magnet may be attached to the outer periphery of the plurality of permanent magnets, in which the magnetic poles are aligned along the penetrating direction of the hollow through hole.

Furthermore, the fixture may be made of stainless steel screws or the like.

Furthermore, in place of the magnetic force reinforcing member, a socket member for an electric driver may be detachably attached to the driver bit.

The magnetic shield case may further include a magnetic shield case for housing at least a driver bit to which the magnetic attachment aid body is attached. The magnetic shield case has a bottomed cylindrical body made of a magnetic material, and the bottomed cylindrical body The tip of the driver bit may be disposed on the inner bottom side, and the magnetic attachment aid main body may be covered with the side wall of the bottomed cylindrical body.

Further, in the motor-driven driver of the present invention, the magnetic attachment assisting tool for any one of the above-mentioned fasteners is mounted on a driver bit.

Furthermore, as the motorized driver according to the present invention, the shaft portion of the driver bit may be provided with a positioning portion for mounting the magnetic attachment aid for a fixing device at an appropriate position.

According to the magnetic attachment aid for fasteners of the present invention, because of the above-described configuration, the leakage of the magnetic flux of the structure obtained by bundling the permanent magnets is almost eliminated, and the magnetic flux is transmitted to the hollow through hole into which the driver bit is inserted. It can be concentrated. Therefore, a large amount of magnetic lines of force can be collected at the tip of the driver bit inserted into the hollow through hole, and as a result, a fixing tool such as a stainless steel screw can be magnetically attached.

Further, according to the motor-driven driver of the present invention, since the configuration is as described above, the driver bit can be magnetized in a simple and inexpensive manner. Moreover, since it becomes the above-mentioned structure, the leakage of the magnetic flux of the structure which bundled the permanent magnet will be almost nonexistent, and a magnetic flux can be concentrated to the hollow through-hole in which a driver bit is inserted. For this reason, a large amount of magnetic lines of force can be collected also at the tip of the driver bit inserted in the hollow through hole, and not only fasteners such as iron screws but also fasteners such as stainless steel screws can be magnetically attached.

(A) is a perspective view which shows the external appearance of the magnetic attachment aid main body which is a structural member of the magnetic attachment aid for fasteners which concerns on one Embodiment of this invention, (b) is the side view. (A) is a cross-sectional view corresponding to the line BB of FIG. 1 (b), (b) is a magnetic attachment aid for the fixture of FIG. 1 (a) corresponding to the line CC of FIG. 2 (a) It is sectional drawing of a tool. (A) is a perspective view which shows the external appearance of the magnetic reinforcing material which is a structural member of the magnetic attachment assistance tool for fasteners which concerns on one Embodiment of this invention, (b) is the same side view. It is a longitudinal cross-sectional view showing the state of use of the magnetic attachment aid for fasteners, the driver bit being inserted, and the screw having been magnetically attached to the tip. It is a figure which shows magnetic flux distribution when a driver bit is inserted by the magnetic attachment aid for fasteners. It is a model explanatory view showing the flow of the magnetic force line of the magnetic attachment assistant for fasteners. It is the model explanatory view which showed the flow of the magnetic force line of other magnetic attachment aids for fixing devices. It is explanatory drawing of the other usage condition of the magnetic attachment assistance tool for fasteners. (A) is a longitudinal cross-sectional view of the socket member used together with a magnetic attachment assistance tool main body, (b) is a longitudinal cross-sectional view which shows the use aspect. (A) is a longitudinal cross-sectional view of a magnetic shielding case, (b) is the longitudinal cross-sectional view which showed the usage aspect of a magnetic shielding case. (A) to (e) are schematic views showing arrangement examples of permanent magnets of a magnetic attachment aid for fasteners. (A) is a front view of an electric driver according to an embodiment of the present invention, (b) is a partial front view of an electric driver according to another embodiment, and (c) is an electric type according to still another embodiment It is a partial front view of a driver.

Hereinafter, embodiments of the present invention will be described with reference to the attached drawings.

The magnetic attachment aid 1 for fixtures (hereinafter referred to as the magnetic attachment aid 1) is an aid used by inserting the driver bit 40 into it. As shown in FIG. 4 etc., the magnetic attachment aid 1 has the same polarity end portions of the adjacent permanent magnets 21 so that the hollow through holes 13 are formed at the centers of the plurality of permanent magnets 21. The driver consists of a magnetic attachment aid main body A formed in a petaloid cylindrical body joined in a bundle without gaps, and a cylindrical ferromagnetic material attached to the tip side of the magnetic attachment aid main body A, the driver And a magnetic reinforcing member 50 adapted to be fitted with the bit 40.

The magnetization directions of the plurality of permanent magnets 21 are defined so that the lines of magnetic force are directed toward the tip at an inclination angle with respect to the axis of the driver bit 40 inserted into the hollow through hole 13 so as to pass through the magnetic force reinforcing member 50. It has become.

The relationship between the permanent magnet 21 and the hollow through hole 13 may be as shown in FIG. 9 other than that shown in FIG. 2 (a), and the hollow through hole 13 at the center is preferably a regular n-gon. However, the present invention is not limited to such a shape. The hollow through hole 13 in this example is a regular hexagonal cross section corresponding to the driver bit 40 having a regular hexagonal cross section.

Next, with reference to FIG. 1 and FIG. 2, the magnetic attachment aid main body A which is a component of the magnetic attachment aid 1 will be described more specifically.

The magnetic attachment aid main body A shown in FIG. 1 has a cylindrical shape having a hollow through hole 13 at the center (see FIG. 1 (a)). The hollow through hole 13 in the illustrated example has a regular hexagonal column shape and is disposed at the center position of the circle.

The magnetic attachment aid main body A includes a main body case 10, a permanent magnet 21, a cushion material 22 made of an elastic material such as rubber, and a yoke 15. Among these, the permanent magnet 21, the cushioning material 22 and the yoke 15 are disposed along the penetrating direction of the hollow through hole 13 as seen in FIG. 2. The yoke 15 may not be provided.

The main body case 10 is made of a nonmagnetic resin that generally forms the cylindrical shape of the magnetic attachment aid main body A, has an opening at the upper part, and has a hexagonal opening for forming the hollow through hole 13 at the lower part. It comprises the main body 11 and the lid 12 closing the upper opening.

In the permanent magnet 21, the resin material 16 is filled in the main body 11 of the main body case 10 so that six identical shapes maintain the shape of the petal. The cross-sectional shape of each permanent magnet 21 is, as shown in FIG. 2A, a hexagonal shape formed by combining a rectangle and an isosceles trapezoid. Further, the arrangement of the polarities is also the same among the permanent magnets 21 and in the example of this example, the hollow through holes 13 side is arranged so as to be the N pole, but the S pole and the N pole may be reversed. .

The six permanent magnets 21 do not form a gap between the permanent magnets 21 provided adjacent to each other, and in the example in the figure, the legs of the isosceles trapezoidal leg are in contact with each other, that is, both sides corresponding to the legs are As the chamfer bonding surface 25, they are arranged in a petal shape so as to be in close contact with each other.

As described above, by using n permanent magnets 21 having the same shape, the cylindrical body can be formed into a regular n-gon. If the cylindrical body is a regular n-gon, the driver bit 40 can be inserted without any gap. In addition, since the adjacent permanent magnets 21 are in close contact with each other at the chamfered joint surfaces, it is possible to prevent magnetic leakage.

Further, it is preferable that a cushioning material 22 be disposed on an end face of each of the plurality of permanent magnets 21 opposite to the hollow through hole 13, and the cushioning material 22 is inserted to be inserted into the hollow through hole 13. Even if the bit diameter is somewhat large or small, the error is absorbed. Although this cushioning material 22 may cause displacement between the chamfering surfaces 25 of the adjacent permanent magnets 21, there is no possibility that a gap will occur because the surfaces are joined.

In the main body 11 of the main body case 10, six permanent magnets 21 are arranged such that the same magnetic poles face each other, so that repulsive forces of the same polarity are generated. Therefore, it is desirable that the permanent magnet 21 be restrained by filling the resin material 16 in the main body 11 to such an extent that slight movement by the cushion material 22 is permitted and the shape of the petal is not broken. The resin material 16 may not be filled as long as the six permanent magnets 21 are accommodated in the main body 11 and fixed to the above degree.

Further, as shown in FIGS. 3 (a) and 3 (b), the magnetic force reinforcing material 50, which is another component of the magnetic attachment aid 1, is a cylindrical body having a tapered portion 52 at its tip, and is a ferromagnetic member. It is formed.

Similar to the magnetic attachment aid main body A, the magnetic force reinforcing member 50 is used by inserting the driver bit 40. Therefore, the bit insertion hole 51 provided at the center has substantially the same diameter as the hollow through hole 13 of the magnetic attachment aid main body A. On the other hand, it is desirable that the outer diameter of the magnetic force reinforcing member 50 is smaller than the outer diameter of the magnetic attachment assisting tool main body A as shown in the example of the present embodiment.

Next, with reference to FIG. 4 and FIG. 5, the usage procedure of the magnetic attachment aid 1 will be described. In addition, as an example of this figure, the magnetic attachment aid main body A which does not have the yoke 15 (refer FIG. 1 grade | etc.,) Was shown.

The plurality of permanent magnets 21 constituting the magnetic attachment assisting body A are directed with respect to the axis 43 (see FIG. 3) of the driver bit 40 inserted into the hollow through hole 13 as indicated by arrows in the direction of the respective magnetizations. It is made to incline and magnetize toward the tip 41. Furthermore, a magnetic reinforcing material 50 in which the driver bit 40 is inserted is further disposed adjacent to the tip end side of the magnetic attachment aid main body A. The magnetic reinforcing material 50 can be magnetically attached to the driver bit 40 by the magnetic force of the magnetic attachment aid main body A. Therefore, once the magnetic reinforcing material 50 is attached to the driver bit 40, there is no risk of the magnetic reinforcing material 50 slipping off during use.

Generally, fixing tools such as stainless steel screws can not be magnetized and can not be magnetically attached. Among stainless steels, austenitic (SUS304) ones are usually nonmagnetic materials in normal times, It is known that when it is deformed by applying a large load, it can be transformed to martensite and magnetized. The inventor of the present invention has already made such a transformation in the process of forming an insertion groove into which the tip 41 of the driver bit 40 is fitted in its head, such as stainless steel screws of SUS 304 used in ordinary buildings. The present invention has been reached by knowing that it has occurred.

In the magnetic attachment aid 1, as shown in FIG. 4, a driver bit 40 made of a ferromagnetic material is formed in the hollow through hole 13 of the magnetic attachment aid A and the bit insertion hole 51 of the magnetic force aid 50. When inserted, the driver bit 40 is magnetized by the magnetic attachment aid A, and the bit insertion groove 48 formed in the head 46 of the stainless steel fixture 45 such as a stainless steel screw is placed on the tip 41 of the driver bit 40 When brought close, the stainless steel screw 45 can be adsorbed. Reference numeral 47 in FIG. 4 denotes a shaft portion of the screw 45.

As shown in FIG. 4, in the state where the driver bit 40 is inserted into the two members of the magnetic attachment aid 1, a magnetic field is formed to which magnetic lines of force 32 are emitted as illustrated by a two-dot chain line. In FIGS. 4 and 5, magnetic lines of force 31 along the axis connecting the magnetic poles are shown separately from the magnetic lines of force 32.

That is, in a state where the driver bit 40 is inserted into the hollow through hole 13 and the bit insertion hole 51, the magnetic flux of the six permanent magnets 21 of the magnetic attachment aid main body A concentrates on the hollow through hole 13. The magnetic flux entering the driver bit 40 further enters the tip end side of the magnetic attachment aid main body A toward the tip and the magnetic flux loop enters the proximal end side and enters the rear end of the magnetic attachment aid main body. At this time, if a large number of magnetic lines 32 can be introduced to the tip 41 of the driver bit 40 at this time, the tip 41 can be made to exert a strong magnetic force to magnetically attach not only iron but also stainless steel screws. it can.

Although the magnetic field substantially the same as that shown in FIG. 5 is formed even in the absence of the magnetic force assisting material 50, the magnetic force assisting material 50 acts to strengthen the magnetic force. The action of the magnetic force auxiliary member 50 will be described later along with the description of FIG.

In the present invention, as described above, a plurality of permanent magnets 21 are joined in a bundle without gaps, a hollow through hole 13 is formed at the center, and a petaloid cylindrical body is formed. Since the magnetic flux radiated from the permanent magnet is concentrated in the hollow through hole to form a strong magnetic field, the driver bit 40 is magnetized and a stainless steel fixture 45 such as a stainless steel screw is attracted to the tip 41 of the driver bit 40 It can be done.

The inventor of the present invention biases the magnetic flux entering the driver bit 40 from the permanent magnet 21 so that the magnetic flux directed to the tip 41 side is larger than the base end 42 side of the driver bit 40 (see FIG. 4 and FIG. It is known that the magnetic flux reinforcements 50 are attached adjacent to each other to obtain a high magnetic flux density at the tip 41 of the driver bit 40.

The magnetic flux is biased to the tip 41 side of the driver bit 40 in such a manner that the respective magnetization directions of the permanent magnets 21 constituting the petaloid cylindrical body are the tip 41 of the driver bit 40 inserted into the hollow portion through hole 13. Such a structure can be easily implemented by giving an orientation of the magnetization of the permanent magnet 21 to the axis 43 of the driver bit 40 with the side facing to the side.

FIG. 6 is a diagram for explaining the direction of magnetization of the permanent magnet 21. As shown in FIG. In this figure, the direction of the magnetization of the permanent magnet 21 is schematically shown magnetized with an inclination of W with respect to the axis 43 of the driver bit 40.

In the case shown in FIG. 6, the direction of magnetization of the permanent magnet 21 is set to an angle W inclined with respect to the axis 43 of the driver bit 40. In this embodiment, the permanent magnet 21 has S pole and N The boundary with the pole is not parallel to the direction of the hollow through hole 13 and the bit insertion hole 51, and the magnetic pole branch point 35 on the tip 41 side of the driver bit 40 is inclined away from the surface of the driver bit 40 .

The magnetic flux radiated from the permanent magnet 21 is larger at the tip end 41 side of the driver bit 40 than at the base end 42 side. Therefore, by changing the inclination angle W, the optimum value that can obtain a larger flux density at the tip end 41 side Can be explored.

The magnetic lines of force from the N pole on the tip side of the holding aid main body A to the tip are induced by the magnetic reinforcements 50 provided adjacent to each other and pass through the magnetic reinforcements 50 so that the magnetic lines of the driver bit 40 are in the other direction. I will not turn to. Therefore, the magnetic flux density at the tip 41 of the driver bit 40 becomes sufficiently large.

In the case where the magnetic force reinforcing member 50 is not attached, the magnetic force inducing action is not generated by the magnetic force reinforcing member 50, so the magnetic force lines 31 going from the N pole on the tip side of the magnetic attachment aid A to the tip 41 are shown in FIG. It tries to return to the S pole as shown by the broken line at 6. Therefore, the magnetic flux density at the tip 41 of the driver bit 40 is smaller than that provided with the magnetic force reinforcing member 50.

Further, according to the study of the present inventor, the magnitude of the magnetic flux at the tip 41 of the driver bit 40 is determined by the boundary point between the S pole and the N pole on the tip 41 side of the driver bit 40 (magnetic pole branch point 35 According to the knowledge, it is known that the length L is approximately determined by the length of the distance L to the end face of the permanent magnet 21 on the N pole side.

According to this, the larger the magnetic pole branch point 35 is from the surface of the driver bit 40, the more magnetic flux can be concentrated on the tip 41 of the driver bit 40. Therefore, using a thicker permanent magnet 21 makes the driver bit A strong magnetic force is generated at the tip 41 of 40.

In this way, the magnetic pole branch point 35 is far from the surface of the driver bit 40 and the magnetic force induction action of the magnetic force reinforcing material 50 can be made to increase the magnetic flux density at the tip 41 of the driver bit 40.

Further, in the magnetic attachment assisting body A having the configuration shown in FIG. 6, many magnetic lines of force 31 having an inclination angle W toward the tip direction with respect to the axial line 43 of the driver bit 40 are emitted. However, the magnetic force can be intensified by the tip 41 of the driver bit 40.

The direction of magnetization of the permanent magnet 21 is changed by the inclination angle W to 20 degrees, 25 degrees, 30 degrees, 45 degrees, and 90 degrees with respect to the axis line 43 of the driver bit 40 by the tip 41 of the driver bit 40 Tests were conducted to measure the magnetic force of A neodymium magnet of a rare earth magnet having a high residual magnetic flux density was used as the permanent magnet 21. However, each of them is magnetized with a magnetic flux density of 20000 G, and six magnets with a residual magnetic density of 5000 G are obtained. What was comprised as a petaloid cylindrical body of a face was used.

Moreover, although the magnetic force at the tip 41 becomes stronger as the protrusion length from the permanent magnet 21 to the tip 41 of the driver bit 40 becomes shorter, the protrusion to such an extent that the magnetic force supplement 50 can be attached It is desirable to be long.

The inventor combined the magnetic attachment assisting tool main body A with a total length of 40 mm and the magnetic force aiding member 50 with a total length of 10 mm, and made the above projecting length 16 mm and tested for the five types of inclination angles W. A large magnetic flux density was obtained at a temperature of 30 degrees. Specifically, when the inclination angle W is 30 degrees, the magnetic flux density of the tip 41 of the driver bit 40 is 8500 gausses or more. Even when the inclination angle W was 20 degrees or 25 degrees, a magnetic flux density of 8000 gauss or more was measured. Further, in the case where the inclination angle W was 45 degrees and 90 degrees, the magnetic flux density was less than 7,000 gauss.

In addition, when the test was conducted at various inclination angles W, it was found that an inclination angle W of 20 degrees to 35 degrees was appropriate, and 25 degrees to 30 degrees was particularly preferable. In addition, when the inclination angle W becomes larger than 35 degrees, the amount of magnetic lines of force toward the proximal end 42 increases, and the amount toward the tip 41 decreases.

As described above, according to the magnetic attachment aid 1, a sufficiently large magnetic flux density as described above can be obtained. Therefore, the stainless steel fixture 45 is magnetically attached with the driver bit 40 to which the magnetic attachment aid 1 is attached. be able to.

Further, in consideration of the fact that the magnetic force assisting material 50 is 10 mm, it is preferable that the projection length from the permanent magnet 21 to the tip 41 of the driver bit 40 be 14 to 16 mm. Further, in consideration of the ease of operation, it is desirable that the tip 41 is not hidden by the magnetic attachment aid 1 when viewed from above at the tip 41 of the driver bit 40. In the magnetic attachment assisting tool 1 of the present embodiment, the magnetic force assisting member 50 has a diameter smaller than that of the magnetic attachment assisting tool body A, and the tapered portion 52 is provided at the front end. There is almost no possibility that the view will be blocked. The tapered portion 52 also contributes to the reduction of the leakage of the magnetic force lines passing through the magnetic force assisting member 50. If the corners are provided, the lines of magnetic force are likely to leak into the air, so that forming the tapered portion 52 can prevent that.

As described above, a magnetic attachment aid main body A in which six neodymium magnets are used as the permanent magnet 21 and which are bundled in a petal-like manner without gaps and a magnetic force aid 50 formed of a ferromagnetic material It has been confirmed that the tip 41 of the driver bit 40 can be strongly magnetized by using the attachment aid 1.

Further, it goes without saying that the same effect of magnetic force reinforcement can be obtained by using a permanent magnet whose side adjacent to the magnetic attachment assisting tool main body A is S pole and its tip end is N pole as the magnetic force assisting member 50.

Further, as shown in FIG. 7, an auxiliary permanent magnet 23 in which the magnetic poles are aligned along the direction of the through hole of the hollow through hole 13 is attached to the outer periphery of the plurality of permanent magnets 21 constituting the petaloid cylindrical body. May be

In the embodiment of FIG. 7, the magnetic poles of the plurality of auxiliary permanent magnets 23 are disposed along the penetrating direction of the hollow through hole 13 and the N pole is disposed on the tip 41 side of the driver bit 40 as illustrated. The auxiliary permanent magnet 23 is disposed on the

According to such a combination of the permanent magnet 21 and the auxiliary permanent magnet 23, the magnetic pole branch point 35 on the tip 41 side of the driver bit 40 can be formed at a further distant position (the distance L can be increased). Together with the action of the magnetic force assisting member 50, a stronger magnetic force is generated on the tip 41 side of the driver bit 40.

Next, another usage of the magnetic attachment aid 1 will be described with reference to FIG.
In this use mode, the magnetic force auxiliary member 50 is not used, and instead, a socket member 68 for the motorized driver 70 (see FIG. 11) is attached and used.

The socket member 68 is formed of a ferromagnetic material and has a hollow hole 68a, and the tip end 41 of the driver bit 40 can be inserted from one end 68b, and the other end 68c is used for replacement (socket member 68 And a member that can be fitted with a replacement bit (not shown). The socket member 68 may be a commercially available one, and although its structure is not shown, the chuck cylinder 68 d is moved in the direction of the arrow in FIG. In addition, since the magnetic attachment assisting tool main body A is attached to the driver bit 40, the socket member 68 can be attracted by the magnetic force, so that the driver is attached to one end 68b side of the tip 41 of the driver bit 40 to be inserted. It is not necessary to have a structure such as a chuck cylinder 68 d for clamping the bit 40.

As described above, if the socket member 68 is attached instead of the magnetic force assisting member 50, it can be used as another type of driver. Also, the socket member 68 acts in the same manner as the magnetic force assisting member 50 so that the magnetic force lines of the magnetic attachment assisting body A can be effectively concentrated on the tip 41.

Next, with reference to FIG. 9, another magnetic attachment aid 1 of the present embodiment will be described.
As shown in FIG. 9, this magnetic attachment aid 1 is provided with a magnetic shield case 60 in addition to the magnetic attachment aid main body A and the magnetic force aid 50 shown in FIGS.

The magnetic shield case 60 shields the magnetic attachment assisting tool main body A so as not to leak the magnetism, includes a bottomed cylindrical body 61 made of a ferromagnetic material, and at least a driver attached with the magnetic attachment assisting tool main body A. It can accommodate the bit 40.

As shown in FIG. 9A, the magnetic shield case 60 shown in the present embodiment has bottomed

cylindrical bodies

61 and 63 made of a pair of magnetic members, and one of the bottomed cylindrical bodies 61 (main body) The opening 63a of the other bottomed cylindrical body 63 (lid) can be externally fitted to the opening 61a.

Each bottomed

cylindrical body

61, 63 is made of a ferromagnetic material, and each

inner bottom

61b, 63b is provided with a cushioned bit

end protection material

62, 64 made of a nonmagnetic material.

For example, as shown in FIG. 9B, this magnetic shield case 40 inserts the tip end side of the driver bit 40 to which the magnetic attachment assisting tool main body A is attached to the small-diameter bottomed cylindrical body 61 (main body). Then, a large diameter bottomed cylindrical body 63 (lid) is placed on the rear end side to cover the entire driver bit 40.

As described above, since the whole of the driver bit 40 to which the magnetic attachment assisting body A is attached is covered with the cylinder of the ferromagnetic body, magnetic leakage can be prevented. Further, since the bit

end protection members

62 and 64 are disposed on the

inner bottoms

61b and 63b, both ends of the driver bit 40 can be suitably protected.

Of course, as shown in FIG. 9B, the driver bit 40 to which the magnetic force auxiliary member 50 is further attached may be accommodated.

In addition, since the bottomed cylindrical body 63 (lid) has a large diameter, the magnetic attachment assisting tool main body A having a diameter larger than that in FIG. 9B and having a size that can not be accommodated in the bottomed cylindrical body 61 (main body). The magnetic attachment aid main body A can also be used to protect the magnetic attachment aid main body A with a bottomed cylindrical body 63 (lid).

Furthermore, in a state where the driver bit 40 to which the magnetic attachment aid main body A is attached is attached to the motorized driver 70 (see FIG. 11), only one of the two bottomed

cylindrical bodies

61 and 63 is covered. It can also be used.

As described above, the magnetic shield case 60 of the present embodiment has the bottomed

cylindrical bodies

61 and 63 made of a ferromagnetic material, and the

inner bottom

61b and 63b of the bottomed

cylindrical bodies

61 and 63 has the tip of the driver bit 40 The magnetic attachment aid main body A is covered with the

side walls

61c and 63c of the bottomed

cylindrical bodies

61 and 63, but it is used by being attached to the motorized driver 70 (see FIG. 11). In consideration of the case, the magnetic shield case 60 may be configured of only one of the two bottomed

cylindrical bodies

61 and 63.

Next, a petaloid cylindrical body used for the magnetic attachment assisting body A will be described with reference to FIGS. 10 (a) to 10 (e).

These have hollow through holes 13 having a cross section other than a hexagonal shape. 9A and 9B, the hollow through hole 13 is circular, in FIG. 10C is square, in FIG. 10D is pentagonal, and in FIG. 10E is rectangular.

As permanent magnet 21, three permanent magnets 21 having the same arc shape are used in FIG. 10 (a), and four permanent magnets 21 having the same arc shape are used in FIG. 10 (b). 10 (c) (d) (e), similarly to the permanent magnet 21 shown in FIG. 2 (a), a hexagonal cross section having a combination of a rectangle and an isosceles trapezoid is used. . 10 (c) and (d), the plurality of permanent magnets 21 have the same shape, but in FIG. 10 (e), two types of permanent magnets 21 are used so as to correspond to the side length of the rectangle. It is done.

Similarly to the one shown in FIG. 2, in the five types of shapes shown in FIG. 9, the faces of the adjacent permanent magnets 21 are in close contact with each other, so that the leakage of the magnetic flux is unlikely to occur. Strong magnetic force can be efficiently given to the tip 41 (see FIG. 5) of

The various magnetic attachment aids A described above can be used by attaching them to the driver bit 40 of the motorized driver. FIG. 11 is an explanatory view of a motor-driven driver 70 provided with the magnetic attachment assisting tool 1 and the driver bit 40 inserted in and removed from the magnetic attachment assisting tool 1. The following motorized driver 70 can be applied to either a drill driver or an impact driver.

The motor-driven driver 70 includes a driver main body 71, a driver bit 40, and a magnetic attachment aid 1 to be attached to and detached from the driver bit 40. The driver bit 40 may be detachably attached to or integrated with the chuck portion 74 of the driver main body 71. The magnetic attachment aid 1 comprises a magnetic attachment aid body A and a magnetic force aid 50.

The motorized driver 70 is configured to perform a screw tightening operation by rotating the driver bit 40 by a motor 72a installed in the driver main body 71.

As shown in FIG. 11A, the driver main body 71 has a body portion 72 in which the motor 72a is installed, a handle portion 73 having a switch 73a, and a chuck portion 74 for holding the driver bit 40. .

The driver bit 40 is made of iron, and in the illustrated example, the tip 41 has a minus shape, but the driver bit 40 may have various shapes such as a plus shape corresponding to a fixing tool.

As shown in FIG. 11A, the shaft portion of the driver bit 40 has an annular protrusion that protrudes outward from the circumferential surface. The annular projection is a positioning portion 40a for attaching the magnetic attachment assisting body A to an appropriate position. The positioning portion 40a regulates the attachment position of the magnetic attachment assisting tool 1 by bringing the rear end side end 1b of the magnetic attachment assisting tool body A into contact with the annular projection. It may be formed by press-fitting a separate ring body.

The positioning portion 40 a determines the distance from the tip end 1 a of the magnetic attachment aid 1 (magnetic force assisting member 50) to the tip 41 of the driver bit 40 and magnetically attaches the fastener to the tip 41 of the driver bit 40. In order to generate sufficient magnetic force. In particular, as described above, a strong magnetic force is required to adsorb the stainless steel fixture 45 (see FIG. 5) by the driver bit 40. However, the magnetic attachment aid 1 is correctly adjusted according to the positioning portion 40a in this manner. By attaching, a strong magnetic force capable of magnetically attaching the stainless steel fixture 45 can be generated.

The positioning portion 40a is also for restricting the movement of the magnetic attachment aid main body A to the proximal end 42 side of the driver bit 40, and may be a projection having another shape which may not be an annular projection. It is also good. Further, as shown in FIG. 11 (b), the positioning portion 40a is a plurality of fine grooves having a scale as shown in the enlarged view, for example, which determines the position of the tip end 1c of the magnetic attachment aid A. May be Note that, as the scale, a relative number representing the strength of the magnetic force generated at the tip when the magnetic attachment assisting tool main body A is aligned with the positioning portion 40a is appended. Further, for example, the display may be distinguished according to the material of the auxiliary tool to be magnetically attached to the tip of the bit, such as high, medium, low, iron strength, iron inside, iron weak, stainless steel, etc.

Moreover, FIG.11 (c) is the figure which showed the example of the further another positioning part 40a. A mark line is provided on the driver bit 40 as a positioning section 40a, and the mark line is provided with a magnetic attachment aid main body A (shown by a two-dot chain line on the right side in the figure assuming movement). When 1c is put together, the iron fixing tool can be magnetically attached appropriately, while the rear end side end 1b of the magnetic attachment assisting tool main body A (shown by a two-dot chain line on the left side in the figure) When the projection length of the driver bit 40 from the tip end portion 1c is shortened, the stainless steel fixture 45 (see FIG. 4) can be appropriately magnetically attached. In addition, you may provide separately the mark line corresponding to the stainless steel fixing tool 45, and the mark line corresponding to the fixing tool made from iron.

In the embodiment described above, since the magnetic attachment aid 1 is a retrofit member for the driver bit 40, it can be easily attached to effectively magnetize the driver bit 40. In particular, in the case where the positioning portion 40a as described above is provided, it can be quickly attached to a position where an appropriate effect appears, so screwing work of the fixing tool can be efficiently performed. The magnetic attachment assisting tool main body A may be integrated with the driver bit 40 in advance, or only the magnetic force assisting member 50 may be detachable.

In addition, a recess (not shown) for fitting connection is formed on the base end side so that the driver bit 40 which can be attached to and detached from the driver main body 71 is fixed and held by the chuck portion 54. In particular, it is desirable that no recess, recess, protrusion or the like is formed on the tip end side of the tip end side 1 a of the magnetic attachment aid 1. Such a straight shape is to avoid the occurrence of a magnetic flux leakage due to a gap between the surface of the driver bit 40 and the magnetic attachment aid 1. In addition, since the positioning part 40a by the annular projection of Fig.11 (a) is in the rear end side of the magnetic attachment aid 1, there is almost no problem even if it is a projection shape, Since 40a is a recess of about the kerf, there is almost no problem even if it is formed on the tip side.

The magnetic force assisting member 50 described above is strongly magnetically attached to the driver bit 40 by the magnetic attachment assisting tool body A, and when it is difficult to remove only that, the magnetic attachment assisting tool body A is shifted to the tip 41 You can remove it as you push it out. Since the magnetic attachment assisting tool main body A is frequently slid, the positioning portion 40a of the driver bit 40 illustrated in FIGS. 11 (a) to 11 (c) works effectively.

1 Magnetic attachment aid for fixtures (magnetic attachment aid)
A Magnetic attachment aid body 10 body case 11 body 12 lid 13 hollow through hole 15 yoke 16 resin material 21 permanent magnet 22 cushion material 23 auxiliary permanent magnet 25 chamfered joint surface 31 magnetic line (axis line connecting magnetic poles)
32 magnetic field line 35 pole branch point 40 driver bit 41 tip of driver bit 42 base end of driver bit 43 axis 45 stainless steel fixture (screw)
46 head 47 shaft portion 48 bit insertion groove 50 magnetic force assisting member 51 bit insertion hole 52 taper portion 60 magnetic shield case 61 bottomed cylindrical body (main body)
61a opening 61b inner bottom 61c side wall 62 bit end protection member 63 bottomed cylinder (lid)
63a inner bottom 63b side wall 64 bit end protection material 68 socket member 68a hollow hole 68b one end 68c other end 68d chuck cylinder 70 electric driver 71 driver main body 72 body 72a motor 73 handle 73a switch 74 chuck Department

Claims

Magnetic attachment aid for fasteners used by inserting a driver bit,
The end portions of adjacent permanent magnets of the same polarity are joined in a bundle without gaps so that a hollow through hole is formed at the center, and a plurality of permanent magnets are formed into a petaloid cylindrical body. Magnetic attachment aid body,
And a magnetic reinforcing material made of a cylindrical ferromagnetic material attached to the front end side of the magnetic attachment assisting tool body and adapted to be fitted with the driver bit.
The magnetization directions of the plurality of permanent magnets are defined so that the magnetic lines of force are directed toward the tip at an inclination angle with respect to the axis line of the driver bit inserted into the hollow through hole, and pass through the magnetic force reinforcing member. Magnetic attachment aid for fasteners characterized by being.
In claim 1,
The magnetic attachment aid for fasteners, wherein each of the plurality of permanent magnets has a cushion material interposed on the end face opposite to the hollow through hole.
In claim 1 or 2,
The magnetic attachment aid for fasteners, wherein the petaloid tubular body has a regular n-gon shape.
In any of claims 1 to 3,
The magnetic attachment aid for fasteners, wherein the permanent magnet forms a chamfering joint surface on the adjacent side surface.
In any of claims 1 to 4,
The magnetic attachment aid for fasteners, wherein an auxiliary permanent magnet having a magnetic pole aligned along the penetrating direction of the hollow through hole is attached to the outer periphery of the plurality of permanent magnets.
In any of claims 1 to 5,
The fixing tool is a fixing tool such as a screw made of stainless steel.
In any one of claims 1 to 6,
A magnetic attachment aid for fasteners, wherein a socket member for a motorized driver is detachably attached to the driver bit instead of the magnetic force reinforcing member.
In any one of claims 1 to 7,
It further comprises a magnetic shield case for housing a driver bit at least attached with the magnetic attachment aid body,
The magnetic shield case has a bottomed cylindrical body made of a magnetic material, and the tip of the driver bit is disposed on the inner bottom side of the bottomed cylindrical body, so that the side wall of the bottomed cylindrical body Magnetic attachment aid for fixtures, which covers the attachment aid body.
An electric screwdriver comprising: a magnetic attachment aid for a fixing device according to any one of claims 1 to 8; and a driver bit inserted into and removed from the magnetic attachment aid for the fixing device.
In claim 9,
A motorized driver, wherein a positioning portion for mounting the magnetic attachment assisting tool for a fixing device at an appropriate position is formed on a shaft portion of the driver bit.