JP6085740B1 - Magnetic attachment aids for fixtures and electric screwdrivers - Google Patents

Abstract

By providing a driver bit and magnetizing it, the present invention provides a magnetic attachment auxiliary tool for a fixture that can magnetize not only iron but also a stainless steel fixture at the tip of the bit, and an electric screwdriver using the same. A plurality of permanent magnets 21 are joined together in a bundle shape without gaps so that adjacent permanent magnets 21 are joined together so that a hollow through hole 13 is formed in the center, thereby forming a petal-like cylindrical body. The formed magnetic attachment auxiliary tool main body A and the magnetic force reinforcing material 50 made of a cylindrical ferromagnetic material having a diameter smaller than that of the magnetic attachment auxiliary tool main body A are provided. The plurality of permanent magnets 21 have their magnetization directions defined so that the magnetic lines of force are inclined toward the tip 41 with respect to the axis of the driver bit 40 inserted into the hollow through hole 13, and the magnetic lines of force are the main body of the magnetic auxiliary tool. It passes through the magnetic reinforcing material 50 in which the driver bit 40 is inserted so as to be adjacent to the tip end side of A.

Description

  The present invention uses a magnetic attachment auxiliary tool for a fixture that is made to adsorb an iron or stainless steel fixture at its tip by inserting and removing a driver bit and the like, and the magnetic attachment auxiliary tool for the fixture. It relates to an electric screwdriver.

  As a conventional magnetizing auxiliary tool for a fixture, for example, there is one described in Patent Document 1 below.

  This auxiliary tool is formed of two semi-rings of neodymium magnets, with a space between the two magnets and arranged 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 at the tip of the driver bit.

JP 2004-141986

  However, the above-mentioned document uses a fixing tool such as an iron screw for attachment, and is strong enough to attract and hold a fixing tool such as a stainless steel screw at the tip of a driver bit of an electric screwdriver. You cannot get a magnetic force.

  Especially recently, iron and other fasteners are rusted and corroded, so they are not suitable for outdoor buildings, and stainless steel screws are often used. As with iron screws, it is desired to develop a magnetic auxiliary tool that can be attracted and held at the tip of a driver bit.

  The present invention has been proposed in view of such circumstances, and its purpose is to strongly magnetize the tip of the driver bit and to magnetically attach it even with a stainless steel fixture. It is to provide an auxiliary tool.

  In order to achieve the above-mentioned object, a magnetic support tool for a fixture according to the present invention is a magnetic support tool for a fixture that is used by inserting a driver bit, and a plurality of permanent magnets are hollow in the center. A magnetic auxiliary accessory body formed in a petal-like cylindrical body by joining ends of the same polarity of adjacent permanent magnets in a bundle without gap so that a through-hole is formed; It is made of a cylindrical ferromagnetic material attached to the distal end side of the auxiliary tool body, and includes a magnetic force reinforcing material into which the driver bit is inserted, and a plurality of permanent magnets are inserted into the hollow through holes. With respect to the axis of the driver bit, the magnetization direction is defined so that the magnetic lines of force are inclined toward the tip with an inclination angle, and pass through the magnetic reinforcing material.

  Moreover, as this invention, it is good also as a structure which interposed the cushioning material in the end surface opposite to each hollow through-hole of a some permanent magnet.

  Further, the petal-like cylindrical body may have a regular n-gonal shape.

  Further, the permanent magnet may have a configuration in which a chamfered joint surface is formed on adjacent side surfaces between the magnets.

  Furthermore, it is good also as a structure by which the auxiliary | assistant permanent magnet which aligned the magnetic pole along the penetration direction of the said hollow through-hole was attached to the outer periphery of several permanent magnet.

  Further, the fixture may be made of stainless steel screws.

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

  The magnetic shield case may further include a magnetic shield case that accommodates a driver bit to which at least a magnetic attachment auxiliary body is attached. The magnetic shield case includes a bottomed cylindrical body made of a magnetic material. The tip of the driver bit may be arranged on the inner bottom side, and the magnetic assisting device main body may be covered with the side wall of the bottomed cylindrical body.

  The electric screwdriver of the present invention has a configuration in which any one of the above-described fixing aids for magnetic attachment is attached to a driver bit.

  Furthermore, the electric driver of the present invention may be one in which a positioning portion for attaching the magnetic auxiliary tool for fixing device to an appropriate position is formed on the shaft portion of the driver bit.

  According to the magnetizing auxiliary tool for a fixing device of the present invention, since it has the above-described configuration, the leakage of the magnetic flux of the structure in which the permanent magnets are bundled is almost eliminated, and the magnetic flux is supplied to the hollow through hole into which the driver bit is inserted. Can concentrate. Therefore, a large amount of magnetic field lines 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.

  In addition, according to the electric driver of the present invention, since it has the above-described configuration, the driver bit can be magnetized by a simple and inexpensive method. Moreover, since it has the above-described configuration, leakage of magnetic flux of the structure in which the permanent magnets are bundled is almost eliminated, and the magnetic flux can be concentrated in the hollow through hole into which the driver bit is inserted. For this reason, a large amount of magnetic field lines can be collected also at the tip of the driver bit inserted into the hollow through hole, and a fixing tool such as a stainless steel screw as well as a fixing tool such as an iron screw can be magnetically attached.

(A) is a perspective view which shows the external appearance of the magnetic attachment auxiliary tool main body which is a structural member of the magnetic attachment auxiliary tool for fixtures concerning one Embodiment of this invention, (b) is the same side view. (A) is a cross-sectional view corresponding to the line BB in FIG. 1 (b), (b) is a magnetic attachment assist for the fixture in FIG. 1 (a) corresponding to the line CC in 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 auxiliary tool for fixtures concerning one Embodiment of this invention, (b) is the same side view. It is the longitudinal cross-sectional view showing the use point of the magnetic attachment auxiliary tool for fixtures, and the state where the screwdriver bit was inserted and the screw was magnetically attached to the tip. It is a figure which shows magnetic flux distribution when a driver bit is inserted by the magnetic attachment auxiliary tool for fixtures. It is the model explanatory drawing which showed the flow of the magnetic force line of the magnetic attachment auxiliary tool for fixtures. It is the model explanatory drawing which showed the flow of the magnetic force line of the other magnetic attachment auxiliary tool for fixtures. It is explanatory drawing of the other usage condition of the magnetic attachment auxiliary tool for fixtures. (A) is a longitudinal cross-sectional view of the socket member used together with a magnetic attachment auxiliary 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 a longitudinal cross-sectional view which showed the usage aspect of the magnetic shielding case. (A)-(e) is a schematic diagram which shows the example of arrangement | positioning of the permanent magnet of the magnetic attachment auxiliary tool for fixtures. (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 motor according to still another embodiment. It is a partial front view of a driver.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  The fixing tool magnetic attachment auxiliary tool 1 (hereinafter referred to as a magnetic attachment auxiliary tool 1) is an auxiliary tool used by inserting a driver bit 40 therein. As shown in FIG. 4 and the like, the auxiliary magnetizing tool 1 includes a plurality of permanent magnets 21 and end portions of the same polarity of adjacent permanent magnets 21 so that a hollow through hole 13 is formed in the center. A magnetic field auxiliary tool main body A formed into a petal-like cylindrical body joined in a bundle without any gaps, and a cylindrical ferromagnetic material attached to the distal end side of the magnetic field auxiliary tool main body A. And a magnetic reinforcing material 50 into which the bit 40 is inserted.

  The plurality of permanent magnets 21 have their magnetization directions defined so that the magnetic lines of force are inclined with respect to the axis of the driver bit 40 inserted into the hollow through-hole 13 and pass through the magnetic reinforcing material 50. It has become.

  The relationship between the permanent magnet 21 and the hollow through hole 13 can be as shown in FIG. 9 in addition to that shown in FIG. 2A. The central hollow through hole 13 is preferably a regular n-square shape. However, it is not limited to such a shape. The hollow through hole 13 of this example has 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 assistance tool main body A, which is a constituent member of the magnetic assistance tool 1, will be described more specifically.

  The magnetic auxiliary accessory body A shown in FIG. 1 has a cylindrical shape having a hollow through hole 13 in the center (see FIG. 1A). The illustrated hollow through-hole 13 has a regular hexagonal column shape and is arranged at the center position of the circle.

  This magnetic auxiliary accessory body A has 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 cushion material 22, and the yoke 15 are arranged along the penetration direction of the hollow through-hole 13 as seen in FIG. 2. Note that the yoke 15 may not be provided.

  The main body case 10 is made of a non-magnetic resin that generally forms the columnar shape of the magnetic attachment assisting device main body A, and has an opening at the top and a hexagonal opening for forming the hollow through hole 13 at the bottom. The main body 11 and a lid body 12 that closes the upper opening.

  The permanent magnet 21 is filled with the resin material 16 in the main body 11 of the main body case 10 so that six of the same shape retain the petal shape. The cross-sectional shape of each permanent magnet 21 is a hexagonal shape formed by combining a rectangle and an isosceles trapezoid as shown in FIG. Also, the arrangement of the polarities is the same between the permanent magnets 21. In the example of this figure, the hollow through hole 13 side is arranged to be the N pole, but the S pole and the N pole may be arranged in reverse. .

  In the illustrated example, the six permanent magnets 21 do not form a gap between adjacent permanent magnets 21, and in the illustrated example, both sides corresponding to the leg sides of the isosceles trapezoid are in contact with each other. The chamfered joint surfaces 25 are arranged in a petal shape so as to be in close contact with each other.

  Thus, if n permanent magnets 21 having the same shape are used, 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 a gap. Moreover, since the adjacent permanent magnets 21 are in close contact with each other between the chamfered joint surfaces, magnetic leakage can be prevented.

  Further, it is desirable that a cushion material 22 be disposed on the end surface of each of the plurality of permanent magnets 21 opposite to the hollow through hole 13. By providing the cushion material 22, the cushion material 22 is inserted into the hollow through hole 13. Even if the bit diameter is slightly larger or smaller, the error is absorbed. The cushion material 22 may cause a deviation between the chamfered joint surfaces 25 of the adjacent permanent magnets 21, but there is no possibility that a gap will be generated because of the joining between the flat surfaces.

  Since the six permanent magnets 21 are arranged in the main body 11 of the main body case 10 so that the same magnetic poles face each other, a repulsive force of the same polarity is generated. Therefore, it is desirable that the permanent magnet 21 is restrained by being filled with the resin material 16 in the main body 11 to such an extent that fine movement by the cushion material 22 is allowed and the shape of the petals is not destroyed. In addition, as long as the six permanent magnets 21 are accommodated in the main body 11 and fixed to the above-described degree, the resin material 16 may not be filled.

  Further, as shown in FIGS. 3 (a) and 3 (b), the magnetic force reinforcing member 50, which is another constituent member of the magnetic attachment aid 1, is a cylinder having a tapered portion 52 at the tip, and is made of a ferromagnetic material. Is formed.

  The magnetic force reinforcing member 50 is used with the driver bit 40 inserted therein, as in the magnetic attachment assisting tool main body A. For this reason, the bit insertion hole 51 provided in the center has substantially the same diameter as the hollow through hole 13 of the magnetizing auxiliary tool body A. On the other hand, it is desirable that the outer diameter of the magnetic reinforcing material 50 is smaller than the outer diameter of the magnetic auxiliary accessory body A as shown in the example of the present embodiment.

  Next, with reference to FIG. 4 and FIG. 5, how to use the magnetic field auxiliary tool 1 will be described. As an example of this figure, a magnetic auxiliary accessory body A that does not have the yoke 15 (see FIG. 1 etc.) is shown.

  The plurality of permanent magnets 21 constituting the magnetic attachment aid main body A are in relation to the axis 43 (see FIG. 3) of the driver bit 40 inserted into the hollow through-hole 13 as indicated by arrows of the respective magnetization directions. Inclined and magnetized so as to be directed toward the tip 41. Further, a magnetic reinforcing material 50 into which a driver bit 40 is inserted is further arranged so as to be adjacent to the distal end side of the magnetic attachment auxiliary tool body A. The magnetic force reinforcing member 50 can be magnetically attached to the driver bit 40 by the magnetic force of the magnetic auxiliary accessory body A. Therefore, once the magnetic stiffener 50 is attached to the driver bit 40, there is no possibility that the magnetic stiffener 50 slips down during use.

  In general, since a fastener such as a stainless steel screw cannot be magnetized, it cannot be magnetized, but among stainless steels, austenitic (SUS304) is usually a non-magnetic material, It is known that when deformed by applying a large load, it can be transformed into martensite and magnetized. The present inventor 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 the head of a stainless steel screw or the like of SUS304 used in a normal building. As a result, the present invention has been achieved.

  In the present magnetic auxiliary tool 1, as shown in FIG. 4, a driver bit 40 made of a ferromagnetic material is provided in the hollow through hole 13 of the magnetic auxiliary tool body A and the bit insertion hole 51 of the magnetic auxiliary material 50. When inserted, the driver bit 40 is magnetized by the magnetic attachment auxiliary tool body 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 formed at the tip 41 of the driver bit 40. When approaching, stainless steel screws 45 can be adsorbed. In addition, the code | symbol 47 of FIG.

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

  That is, in the 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 magnetizing auxiliary tool body A concentrates on the hollow through hole 13 and the driver bit 40. The magnetic flux entering the driver bit 40 and entering the driver bit 40 enters the distal end side of the magnetic auxiliary accessory body A toward the distal end, and enters the proximal end side and enters the rear end of the magnetic auxiliary accessory body. Therefore, if a large number of lines of magnetic force 32 can be guided to the tip 41 of the driver bit 40 at this time, a strong magnetic force can be applied to the tip 41 by using not only iron but also stainless steel screws. it can.

  Even when there is no magnetic auxiliary material 50, a magnetic field similar to that shown in FIG. 5 is formed. However, the magnetic auxiliary material 50 acts to strengthen the magnetic force. The operation of the magnetic force auxiliary material 50 will be described later together with the description of FIG.

  In the present invention, as described above, a plurality of permanent magnets 21 are joined together in a bundle without gaps, and a hollow through-hole 13 is formed in the center to form a petal-like cylindrical body. Since a strong magnetic field is formed by concentrating the magnetic flux radiated from the permanent magnet in the hollow through-hole, the driver bit 40 is magnetized and the stainless steel fixture 45 such as a stainless steel screw is attracted to the tip 41 of the driver bit 40. Can be made.

  The inventor biases the magnetic flux entering the driver bit 40 from the permanent magnet 21 so that the magnetic flux directed toward the tip 41 side is larger than the base end 42 side of the driver bit 40 (the magnetic field lines 31 in FIGS. 4 and 5). It was found that a high magnetic flux density can be obtained by the tip 41 of the driver bit 40 by attaching the magnetic force reinforcing material 50 adjacently.

  The form in which the magnetic flux is biased toward the tip 41 of the driver bit 40 is such that the direction of magnetization of each permanent magnet 21 constituting the petal-like cylindrical body is changed to the tip 41 of the driver bit 40 inserted into the hollow through hole 13. Such a structure can be easily implemented by making the direction of magnetization of the permanent magnet 21 an angle with respect to the axis 43 of the driver bit 40.

  FIG. 6 is a diagram for explaining the direction of magnetization of the permanent magnet 21. In this drawing, the magnetization direction of the permanent magnet 21 is schematically shown as being inclined with respect to the axis 43 of the driver bit 40 by W.

  In the configuration shown in FIG. 6, the direction of magnetization of the permanent magnet 21 is set to an inclined angle W with respect to the axis 43 of the driver bit 40. In this embodiment, the permanent magnet 21 has the S pole and the N pole. 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 so as to be away from the surface of the driver bit 40. .

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

  The magnetic lines of force extending from the N pole on the distal end side of the attachment assisting device main body A toward the distal end are guided by the magnetic reinforcing material 50 provided adjacently and pass through the magnetic reinforcing material 50, so that the magnetic force lines of the driver bit 40 are in the other direction. There is no bend. Therefore, the magnetic flux density is sufficiently large at the tip 41 of the driver bit 40.

  When the magnetic reinforcing material 50 is not attached, the magnetic force inducing action by the magnetic reinforcing material 50 does not occur. Therefore, the magnetic force lines 31 that are directed from the N pole on the tip side of the magnetic attachment assisting device main body A toward the tip 41 are shown in FIG. As shown by the broken line in FIG. Therefore, the magnetic flux density at the tip 41 of the driver bit 40 is smaller than that provided with the magnetic force reinforcing material 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 the boundary point on the tip 41 side of the driver bit 40 (the magnetic pole branch point 35) of the boundary line between the S pole and the N pole. To the end face of the permanent magnet 21 on the N-pole side is generally determined by the length of the distance L.

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

  Thus, the magnetic flux density at the tip 41 of the driver bit 40 can be increased due to the fact that the magnetic pole branch point 35 is far from the surface of the driver bit 40 and the magnetic force inducing action of the magnetic force reinforcing member 50.

  In addition, in the magnetic field auxiliary tool body A having the configuration shown in FIG. 6, many magnetic lines 31 having an inclination angle W toward the distal end are radiated with respect to the axis 43 of the driver bit 40, so that the thickness is not increased. However, the magnetic force can be increased by the tip 41 of the driver bit 40.

  At the tip 41 of the driver bit 40, the magnetization direction of the permanent magnet 21 is changed to 20 degrees, 25 degrees, 30 degrees, 45 degrees, and 90 degrees with respect to the axis 43 of the driver bit 40. The test which measures the magnetic force of was performed. As the permanent magnet 21, a rare earth magnet neodymium magnet having a high residual magnetic flux density was used, and each of the magnets was magnetized at a magnetic flux density of 20000 G and a residual magnetic density of 5000 G was bundled to obtain 6 pieces. What was comprised as a petal-like cylindrical body of a face body was used.

  Further, the shorter the protrusion length from the permanent magnet 21 to the tip 41 of the driver bit 40, the stronger the magnetic force at the tip 41. However, since the magnetic force auxiliary material 50 is attached, the protrusion to the extent that the magnetic force auxiliary material 50 can be attached. It is desirable to be long.

  The inventor combined the magnetic auxiliary auxiliary tool body A having a total length of 40 mm and the magnetic assisting material 50 having a total length of 10 mm, the protrusion length was set to 16 mm, and the five inclination angles W were tested. Was 30 degrees and a large magnetic flux density was obtained. Specifically, when the inclination angle W is 30 degrees, the magnetic flux density at the tip 41 of the driver bit 40 is 8500 gauss or more. Even when the tilt angle W was 20 degrees or 25 degrees, a magnetic flux density of 8000 gauss or more was measured. In addition, when the tilt angle W was 45 degrees and 90 degrees, the magnetic flux density was less than 7000 gauss.

  Further, when the test was conducted with various other 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. Further, when the inclination angle W is larger than 35 degrees, the amount of magnetic lines of force directed toward the base end 42 increases and the amount toward the distal end 41 decreases.

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

  In addition, it is desirable that the protruding length from the permanent magnet 21 to the tip 41 of the driver bit 40 is 14 to 16 mm in consideration of the magnetic auxiliary material 50 being 10 mm. Further, considering the ease of operation, it is desirable that the tip 41 is not hidden by the magnetizing aid 1 when the direction of the tip 41 of the driver bit 40 is viewed from above. In the magnetic field auxiliary tool 1 of the present embodiment, the magnetic force auxiliary material 50 is smaller in diameter than the magnetic field auxiliary tool main body A, and a tapered portion 52 is provided at the tip. The field of view is almost never blocked. The tapered portion 52 contributes to a reduction in leakage of magnetic field lines passing through the magnetic force auxiliary material 50. This is because if the corners are provided, the lines of magnetic force are likely to leak into the air, so that it can be prevented by forming the tapered portion 52.

  As described above, a magnetizing auxiliary tool main body A in which six neodymium magnets are used as the permanent magnet 21 and are bundled in a petal shape without a gap, and a magnetic auxiliary material 50 formed of a ferromagnetic material. It was confirmed that the tip 41 of the driver bit 40 can be strongly magnetized by using the wearing aid 1.

  Needless to say, the same magnetic force reinforcing effect can be obtained even if a permanent magnet having the S-pole on the side adjacent to the magnetic auxiliary accessory body A and the N-pole on the tip side is used as the magnetic auxiliary material 50.

  Further, as shown in FIG. 7, auxiliary permanent magnets 23 having magnetic poles aligned along the direction of the through holes of the hollow through holes 13 are attached to the outer periphery of the plurality of permanent magnets 21 constituting the petal-like cylindrical body. May be.

  In the form of FIG. 7, the plurality of auxiliary permanent magnets 23 are arranged such that their magnetic poles are arranged along the penetration direction of the hollow through hole 13, and the N pole is arranged on the tip 41 side of the driver bit 40. An auxiliary permanent magnet 23 is disposed on the front.

  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 farther position (distance L can be increased). Combined with the action of the magnetic force auxiliary material 50, a stronger magnetic force is generated on the tip 41 side of the driver bit 40.

Next, another use mode of the magnetic attachment aid 1 will be described with reference to FIG.
In this usage mode, the magnetic force auxiliary material 50 is not used, and instead a socket member 68 for the electric 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. The tip 41 of the driver bit 40 can be inserted from one end 68b, and a replacement (socket member 68 can be inserted from the other end 68c. This is a member to which a replacement bit (not shown) can be attached. The socket member 68 may be a commercially available one, and the structure thereof is not shown, but the chuck bit 68d is moved in the direction of the arrow in FIG. Since the magnetic attachment assisting tool main body A is attached to the driver bit 40, the socket member 68 can be adsorbed by the magnetic force. It is not necessary to have a structure like the chuck cylinder portion 68d for sandwiching the bit 40.

  In this way, if the socket member 68 is attached instead of the magnetic force auxiliary member 50, it can be used as another type of driver. Further, the socket member 68 acts in the same manner as the magnetic force assisting member 50, so that the magnetic lines of force of the magnetic attachment assisting tool body A can be effectively concentrated on the tip 41.

Next, with reference to FIG. 9, another magnetizing aid 1 of this embodiment will be described.
As shown in FIG. 9, the magnetic auxiliary aid 1 includes a magnetic shield case 60 in addition to the magnetic auxiliary aid body A and the magnetic auxiliary material 50 shown in FIGS. 1 to 6.

  This magnetic shield case 60 shields the magnetism assisting tool main body A from leaking out, has a bottomed cylindrical body 61 made of a ferromagnetic material, and has at least a driver for attaching the magnetizing assisting tool main body A. The bit 40 can be accommodated.

  As shown in FIG. 9A, the magnetic shield case 60 shown in this embodiment has bottomed cylinders 61 and 63 made of a pair of magnetic bodies, and one bottomed cylinder 61 (main body). The opening 63a of the other bottomed cylindrical body 63 (lid) can be externally fitted into the opening 61a.

  Each of the bottomed cylinders 61 and 63 is made of a ferromagnetic material, and each of the inner bottoms 61b and 63b is provided with a bit end protection member 62 and 64 having a cushioning property made of a nonmagnetic material.

  In this magnetic shield case 40, for example, as shown in FIG. 9B, the distal end side of the driver bit 40 to which the magnetic attachment assisting device main body A is attached is inserted into a small-diameter bottomed cylindrical body 61 (main body). In addition, the bottomed cylinder 63 (lid) having a large diameter is covered on the rear end side so that the entire driver bit 40 is covered.

  Thus, since the entire driver bit 40 to which the magnetic attachment assisting tool main body A is attached is covered with the ferromagnetic cylinder, it is possible to prevent magnetic leakage. In addition, 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, a driver bit 40 to which a magnetic auxiliary material 50 is further attached may be accommodated.

  Further, since the bottomed cylindrical body 63 (lid) has a large diameter, the magnetic field auxiliary tool main body A having a diameter larger than that of FIG. 9B and cannot be accommodated in the bottomed cylindrical body 61 (main body). About, it can also be used so that the magnetic attachment auxiliary tool main body A may be protected with the bottomed cylindrical body 63 (lid).

  Further, when the driver bit 40 with the magnetic attachment assisting device main body A is attached to the electric screwdriver 70 (see FIG. 11), only one of the two bottomed cylinders 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 cylinders 61 and 63 made of a ferromagnetic material, and the tip of the driver bit 40 is provided on the inner bottoms 61b and 63b of the bottomed cylinders 61 and 63. Is arranged such that the side walls 61c, 63c of the bottomed cylinders 61, 63 cover the magnetic auxiliary accessory body A, but are used by being mounted on an electric driver 70 (see FIG. 11). In consideration of the case, the magnetic shield case 60 may be configured by only one of the two bottomed cylinders 61 and 63.

  Next, the petal-like cylindrical body used for the magnetic attachment aid main body A will be described with reference to FIGS. 10 (a) to 10 (e).

  These have the hollow through-hole 13 having a cross-sectional shape other than a hexagon. 9 (a) and 9 (b), the hollow through-hole 13 is circular, FIG. 10 (c) is square, FIG. 10 (d) is pentagonal, and FIG. 10 (e) is rectangular.

  As the permanent magnets 21, three identical arc-shaped permanent magnets 21 are used in FIG. 10A, and four identical arc-shaped permanent magnets 21 are used in FIG. 10B. Further, in FIGS. 10C, 10D, and 10E, a hexagonal shape in which the cross section is a combination of a rectangular shape and an isosceles trapezoid is used similarly to the permanent magnet 21 shown in FIG. . 10C and 10D, the plurality of permanent magnets 21 have the same shape, but in FIG. 10E, two types of permanent magnets 21 are used so as to correspond to the side length of the rectangle. It has been.

  The five types of shapes shown in FIG. 9 are similar to those shown in FIG. 2, since the adjacent permanent magnets 21 are in close contact with each other, magnetic flux leakage hardly occurs, and the driver bit 40 The tip 41 (see FIG. 5) can be effectively given a strong magnetic force.

  The various magnetic attachment assisting tool main bodies A described above can be used by being attached to a driver bit 40 of an electric screwdriver. FIG. 11 is an explanatory diagram of an electric screwdriver 70 including a magnetic attachment aid 1 and a driver bit 40 that is inserted into and removed from the magnetic attachment aid 1. The following electric screwdriver 70 can be applied to both a drill driver and an impact driver.

  The electric driver 70 includes a driver main body 71, a driver bit 40, and a magnetic attachment aid 1 that is attached to and detached from the driver bit 40. The driver bit 40 may be detachable with respect to the chuck portion 74 of the driver main body 71 or may be integrated. The magnetic assistance tool 1 includes a magnetic assistance tool main body A and a magnetic assistance material 50.

  The electric screwdriver 70 is configured to perform screw tightening work by rotating the driver bit 40 by a motor 72a built in the driver main body 71.

  As shown in FIG. 11A, the driver main body 71 includes a body portion 72 that includes a motor 72 a, a handle portion 73 that includes a switch 73 a, and a chuck portion 74 that holds the driver bit 40. .

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

  As shown in FIG. 11A, the shaft portion of the driver bit 40 has an annular protrusion that protrudes outward from the peripheral surface. This annular protrusion is a positioning part 40a for attaching the magnetic auxiliary accessory body A to an appropriate position. The positioning portion 40a regulates the attachment position of the magnetic auxiliary accessory 1 by bringing the rear end 1b of the magnetic auxiliary accessory body A into contact with the annular protrusion. You may press-fit a separate ring body.

  The positioning portion 40a determines the distance from the tip side end 1a of the magnetic sticking auxiliary tool 1 (magnetic force auxiliary material 50) to the tip 41 of the driver bit 40, and magnetically attaches the fixing tool to the tip 41 of the driver bit 40. In order to generate a sufficient magnetic force. In particular, as described above, a strong magnetic force is required to attract the stainless steel fixture 45 (see FIG. 5) with the driver bit 40, but the magnetic field auxiliary tool 1 is properly adjusted according to the positioning portion 40a. By attaching, the strong magnetic force which can magnetically attach the stainless steel fixture 45 can be generated.

  The positioning portion 40a is also for restricting the movement of the magnetic attachment assisting tool main body A toward the base end 42 side of the driver bit 40. Also good. Further, as shown in FIG. 11 (b), the positioning portion 40a is a plurality of fine grooves with a scale as shown in, for example, an enlarged view, which determine the position of the tip side end portion 1c of the magnetic auxiliary accessory body A. May be. In addition, as a scale, the relative number showing the intensity | strength of the magnetic force which arises at the front-end | tip when the magnetic field auxiliary tool main body A is aligned with the positioning part 40a is appended. Further, for example, a distinction display according to the material of the auxiliary tool to be magnetically attached to the tip of the bit, such as strong, medium, weak, iron strong, medium iron, iron weak, and stainless steel, may be provided.

  Moreover, FIG.11 (c) is the figure which showed the example of the other positioning part 40a. The driver bit 40 is provided with a mark line as a positioning portion 40a, and the tip end side end portion of the magnetizing auxiliary tool body A (shown by a two-dot chain line on the right side in the drawing assuming movement) on the mark line. When 1c is combined, the iron fixture can be properly magnetized, while the rear end side 1b of the magnetic auxiliary tool body A (shown by the two-dot chain line on the left in the figure) is aligned with the mark line Thus, when the protruding length of the driver bit 40 from the distal end 1c is shortened, the stainless steel fixture 45 (see FIG. 4) can be appropriately magnetized. In addition, you may provide the mark line corresponding to the stainless steel fixture 45, and the mark line corresponding to an iron fixture separately.

  In the above-described embodiment, the magnetic field auxiliary tool 1 is a retrofitting member for the driver bit 40, so that the driver bit 40 can be easily magnetized and effectively magnetized. In particular, in the case where the positioning portion 40a as described above is provided, it can be quickly attached at a position where an appropriate effect appears, so that the fixing device can be screwed efficiently. The magnetic assisting tool main body A may have a structure integrated with the driver bit 40 in advance, or only the magnetic assisting material 50 may be detachable.

  Further, the driver bit 40 detachably attached to the driver main body 71 has a recess (not shown) for fitting connection on the base end side so as to be fixedly held by the chuck portion 54. In particular, it is desirable that no depressions, depressions, projections, or the like are formed on the distal end side of the distal end side portion 1a of the magnetizing aid 1. The reason for the 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 field auxiliary tool 1. Since the positioning portion 40a by the annular protrusion in FIG. 11A is on the rear end side of the magnetic attachment aid 1, there is almost no problem even if it has a protrusion shape. The positioning portion by the narrow groove in FIG. Since 40a is a concave part of a cut groove, there is almost no problem even if it is formed on the tip side.

  The magnetic auxiliary material 50 shown above is strongly magnetically attached to the driver bit 40 by the magnetic auxiliary tool body A, and when it is difficult to remove only the magnetic auxiliary material 50, the magnetic auxiliary material A is shifted to the tip 41. Remove it to push it out. Since the magnetic auxiliary tool body A is frequently slid, the positioning portion 40a of the driver bit 40 illustrated in FIGS. 11A to 11C effectively operates.

1 Magnetic attachment aids for fixtures (Magnetic attachment aids)
A Magnetic assisting tool main body 10 Main body case 11 Main 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 field line (axis connecting magnetic poles)
32 Magnetic field lines 35 Magnetic 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 48 Bit insertion groove 50 Magnetic auxiliary material 51 Bit insertion hole 52 Tapered portion 60 Magnetic shield case 61 Bottomed cylindrical body (main body)
61a Opening 61b Inner bottom 61c Side wall 62 Bit end protection material 63 Bottomed cylindrical body (lid)
63a Inner bottom 63b Side wall 64 Bit end protector 68 Socket member 68a Hollow hole 68b One end 68c The other end 68d Chuck cylinder part 70 Electric driver 71 Driver main body 72 Body part 72a Motor 73 Handle part 73a Switch 74 Chuck Part

Claims (9)

It is a magnetic attachment aid for a fixture used by inserting a screwdriver bit,
A plurality of permanent magnets are formed into a petal-like cylindrical body by joining ends of the same polarity of adjacent permanent magnets in a bundle without gaps so that a hollow through hole is formed in the center. A magnetizing aid body,
It is made of a cylindrical ferromagnetic material attached to the distal end side of the magnetic attachment auxiliary tool body, and includes a magnetic force reinforcing material into which the driver bit is inserted,
The magnetization directions of the plurality of permanent magnets are regulated so that the magnetic lines of force are inclined toward the tip with respect to the axis of the driver bit inserted into the hollow through hole, and pass through the magnetic reinforcing material. A magnetic attachment aid for a fixing device, characterized in that According to claim 1,
Each of the plurality of permanent magnets is a magnetizing auxiliary tool for a fixture, wherein a cushion material is interposed on an end surface opposite to the hollow through hole. According to claim 1 or 2,
The petal-like cylindrical body is a magnetizing auxiliary tool for fixtures having a regular n-gonal shape. In any one of claims 1 to 3,
The permanent magnet has a chamfering joint surface on an adjacent side surface, and is a magnetic attachment aid for a fixture. In any one of claims 1 to 4,
A magnetic auxiliary tool for fixing device, wherein auxiliary permanent magnets having magnetic poles aligned along the penetration direction of the hollow through hole are attached to the outer periphery of the plurality of permanent magnets. In any one of claims 1 to 5,
The fixing tool is a fixing tool such as a stainless steel screw. In any one of Claims 1-6 ,
It further comprises a magnetic shield case for accommodating a driver bit to which at least the magnetic attachment auxiliary tool body is attached,
The magnetic shield case has a bottomed cylindrical body made of a magnetic material, and the tip of the driver bit is arranged on the inner bottom side of the bottomed cylindrical body so that the magnetic field is formed on a side wall of the bottomed cylindrical body. A magnetic attachment assisting tool for a fixture, which is configured to cover the main body of the assisting tool. An electric screwdriver comprising the magnetic attachment auxiliary tool for a fixture according to any one of claims 1 to 6 , and a driver bit inserted into and removed from the magnetic attachment auxiliary tool for the fixture. In claim 9,
An electric screwdriver, wherein a shaft portion of the driver bit is formed with a positioning portion for mounting the fixing tool magnetic auxiliary tool at an appropriate position.

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