JP3167030U - Magnet with urethane - Google Patents

Abstract

An object of the present invention is to provide a magnet which can be easily fitted into a fitting hole provided in an object to be mounted in a light press-fit state and assembled. Kind Code: A1 In a urethane-fitted magnet that is fitted in a fitting hole provided in an attachment object in a light press-fit state, a magnet 11 such as a cylindrical neodymium magnet or a cobalt magnet and a side surface 11a of the magnet are fixed. And a urethane layer 12 made of ether-based polyurethane or the like, which is covered with a thickness of 3 mm. One end 11b or both ends 11b and 11c of the magnet are covered by the urethane layer 12 together with the side surface 11a. A groove along the length direction or a spiral ridge may be provided on the side surface 12e of the urethane-coated magnet. [Selection diagram] Fig. 1

Description

  The present invention relates to a magnet with urethane including a columnar magnet and a urethane layer covering a side surface of the magnet.

  Conventionally, permanent magnets are widely used in fields such as daily necessities, toys, and mechanical engineering in order to attract and fix articles made of magnetic materials.

  For example, Patent Document 1 describes a device related to a magnet stopper that can be used for various household items such as clothing and furniture. This magnet stopper is configured by fusing a thermoplastic resin magnet to a stopper body made of a thermoplastic resin.

  Patent Document 2 describes a device related to a toy assembly block that can be used to easily assemble various toys such as automobiles and airplanes. This toy assembly block is configured by attaching magnets having different polarities to one end and the other end of a body.

  Patent Document 3 describes a device relating to a chuck table that holds a workpiece in a processing apparatus that processes the workpiece. In this chuck table, in order to fix the annular frame holding the workpiece to the chuck table frame, the annular frame is made of a ferromagnetic material, and the annular frame is attracted by a permanent magnet embedded in the chuck table frame. I have to.

JP 2007-222527 A JP 2010-234050 A JP 2010-21464 A

  As described above, magnets are conventionally used in various fields. However, in any case, it is necessary to use screws, mounting brackets, or the like for mounting, which is complicated. On the other hand, if a fitting hole for attaching a magnet is previously provided in another article, the magnet can be easily fitted into this fitting hole, and it can be securely fixed and attached. The article can be easily and quickly assembled, which is preferable.

  Then, this invention is providing the magnet which can be easily fitted and assembled with the fitting hole provided in the attachment target object in the light press-fit state.

  In order to achieve the above object, a magnet with urethane according to the present invention is a magnet with urethane that is fitted in a light press-fitted state into a fitting hole provided in an attachment object, and includes a columnar magnet, And a urethane layer covering a side surface of the magnet with a predetermined thickness.

  According to this, when the magnet with urethane is fitted into the fitting hole provided in the mounting object in a light press-fit state, the urethane layer is easily fitted with a relatively weak force by the action of the urethane layer. Can be pushed into the hole. Moreover, since the magnet with urethane is fitted into the fitting hole in a light press-fit state and is firmly fixed by the frictional force of the surface, it is securely fixed to the attachment object in a state where it cannot be moved. The

  In the present invention, one or both ends of the magnet may be covered with the urethane layer together with the side surface.

  When only one end is covered with the urethane layer, it is fitted from the end of the mounting object that is not covered with the urethane layer and covered with the urethane layer. The other end is exposed on the surface of the attachment object. The exposed end is protected by a urethane layer. In this case, since the magnetic force is weakened by the urethane layer, the attractive force of the magnet can be weakened.

  When the end that is fitted in the opposite direction and is not covered with the urethane layer is exposed on the surface of the object to be mounted, it acts on the object to be attracted without weakening the magnet's attracting force. . When both ends are covered with the urethane layer, the surface treatment for the magnet is unnecessary, and therefore the manufacturing process of the magnet with urethane can be simplified.

  In this invention, the outer peripheral part of the edge part by the side of the fitting direction to the said fitting hole may become a taper surface where a diameter reduces toward the end surface of this edge part side. According to this, when the magnet with urethane is fitted into the fitting hole of the object to be attached, the tip of the magnet with urethane can be easily introduced and fitted into the fitting hole.

  In this invention, the groove | channel along the length direction may be provided in the side surface of the magnet with a urethane. According to this, when the urethane-equipped magnet is fitted into the fitting hole provided in the attachment object, the air in the fitting hole easily escapes along the groove, so that the fitting can be easily performed.

  In this invention, the said magnet is a cylindrical thing, and the spiral protrusion part may be provided in the side surface of the magnet with a urethane. According to this, when the magnet with urethane is fitted into the fitting hole provided in the attachment object, the air in the fitting hole easily escapes along the spiral ridge portion, so that the fitting is easily performed. be able to.

It is the front view and side view of a magnet with urethane which concern on the 1st Embodiment of this invention. It is sectional drawing which shows a mode that the magnet with a urethane of FIG. 1 was attached to the attachment target object. It is a perspective view which shows the example of application of the magnet with a urethane of FIG. It is a perspective view which shows another example of application of the magnet with a urethane of FIG. It is the front view and side view of a magnet with urethane which concern on the 2nd Embodiment of this invention. It is the front view and side view of a magnet with urethane which concern on the 3rd Embodiment of this invention. It is the front view and side view of a magnet with urethane which concern on the 4th Embodiment of this invention. It is the front view and side view of a magnet with urethane which concern on the 5th Embodiment of this invention. It is the front view and side view of a magnet with urethane which concern on the 6th Embodiment of this invention. It is the front view and side view of a magnet with urethane which concern on the 6th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1A and 1B are a front view and a side view of a magnet with urethane according to the first embodiment of the present invention. As shown in the figure, the magnet 1 with urethane includes a columnar magnet 11 and a urethane layer 12 that covers a side surface and a bottom surface of the magnet 11 with a predetermined thickness.

  As the magnet 11, for example, a neodymium magnet having an attractive force of about 0.4 to 20 kgf and a surface magnetic flux density of about 2700 to 3500 gauss can be used. Neodymium magnets are currently the most powerful and have excellent mechanical strength. However, since neodymium magnets easily rust, the exposed surface needs to be subjected to a surface treatment for protecting the surface. As the surface treatment, for example, nickel plating is applicable.

  In addition to neodymium magnets, cobalt magnets that are excellent in coercive force and suitable for use in high-temperature environments, ferrite magnets that are inexpensive and suitable for mass production, and the like can be used.

  The urethane layer 12 is, for example, an ether-based polyurethane layer having a Shore hardness of A90 or A70. For example, 1 mm corresponds to the thickness of the urethane layer 12.

  The urethane-equipped magnet 1 can be manufactured, for example, as follows. That is, first, an adhesive is applied to the magnet 11 before magnetization. Next, the magnet 11 is placed in a mold together with the molten polyurethane, and the polyurethane is cured to bond the polyurethane to the magnet 11 so that the side surface 11a and one end surface 11b are the urethane layer 12. A covered magnet 11 is obtained.

  Next, nickel plating is applied to the end surface 11 c of the magnet 11 that is not covered with the urethane layer 12. And the magnet 11 is magnetized and the magnet 1 with a urethane is obtained. The magnetizing process is performed, for example, so that one end face 11b of the magnet 11 becomes an N pole and the other end face 11c becomes an S pole.

  FIG. 2 shows a state in which the urethane magnet 1 is attached to an attachment object. Reference numeral 2 in the figure denotes an attachment object to which the urethane magnet 1 is attached. The attachment object 2 is provided with a fitting hole 21 for attaching the magnet 1 with urethane in advance. The depth of the fitting hole 21 is the same as the length of the magnet 1 with urethane.

  The diameter of the fitting hole 21 has such a size that when the urethane-equipped magnet 1 is fitted into the fitting hole 21, a light press-fit state is established in relation to the diameter of the urethane-equipped magnet 1. The fitting into the fitting hole 21 is performed from the end face 11c side.

  The end surface 12a on the side covered with the urethane layer 12 of the magnet 1 with urethane attached to the attachment object 2 is at the same level as the surface 22 of the attachment object 2. Since the magnet 1 with urethane is fitted to the fitting hole 21 in a light press-fitted state, the magnet 1 with urethane is fixed with a strength that cannot be moved relative to the attachment object 2.

  FIG. 3 shows an application example of the magnet 1 with urethane. In the figure, 3 is a part to be processed, and 4 is a stage for positioning and holding the part 3. The stage 4 includes a mounting surface 41 for mounting the processed component 3, positioning pins 42 and 43 provided on the mounting surface 41, and the magnet 1 with urethane attached to the mounting surface 41. . The magnet 1 with urethane is attached to the stage 4 in the state described with reference to FIG. Therefore, the end surface 12 a is located at the same level as the placement surface 41.

  The processed part 3 is provided with positioning holes 32 and 33 corresponding to the positioning pins 42 and 43. The processed part 3 is made of a magnetic material.

  When the processed component 3 is placed on the mounting surface 41, as shown in the figure, the positioning pins 42 and 43 are fitted into the positioning holes 32 and 33 to position the processed component 3, and the processed component 3 3 is adsorbed by the magnet 1 with urethane and fixed on the mounting surface 41.

  FIG. 4 shows another application example of the magnet 1 with urethane. Reference numeral 10 in the figure denotes one block constituting the block toy. The urethane-equipped magnet 1 is attached to one surface of the block 10 in the state described with reference to FIG. When the block 10 is used, it is connected to and fixed to another magnetic block or the block 10 to which the reverse polarity urethane-attached magnet 1 is attached via the urethane-attached magnet 1 attached to the block 10. The

  FIG. 5 shows a urethane magnet according to the second embodiment. In the urethane-equipped magnet 1 shown in FIG. 1, the urethane layer 12 covers the end surface 11b of the magnet 11 and does not cover the end surface 11c. On the other hand, in the magnet 5 with urethane of FIG. 5, the urethane layer 12 covers only the side surface 11a of the magnet 11 and does not cover the end surfaces 11b and 11c. About another point, it is the same as that of the case of the magnet 1 with a urethane.

  FIG. 6 shows a urethane magnet according to the third embodiment. In the magnet 1 with urethane in FIG. 1, the end surface 11 c of the magnet 11 is not covered with the urethane layer 12, whereas in the magnet 6 with urethane in FIG. 6, the end surface 11 c is also covered with the urethane layer 12. Moreover, in the magnet 6 with urethane, the outer peripheral part in the edge part by the side of the fitting direction to the fitting hole of the attachment target object becomes the taper surface 12c from which a diameter reduces toward the end surface 12b of this edge part side. .

  According to this, since the entire surface of the magnet 11 is covered with the urethane layer 12, the surface treatment for the magnet 11 can be omitted, and the manufacturing process of the magnet 6 with urethane can be simplified. In addition, when the urethane-equipped magnet 6 is fitted into the fitting hole 21 of the attachment object as shown in FIG. 2, the end on the fitting direction side is easily introduced into the fitting hole 21, and the fitting is performed. Can be combined. About another point, it is the same as that of the case of the magnet 1 with a urethane.

  FIG. 7 shows a magnet with urethane according to the fourth embodiment. In the magnet 1 with urethane in FIG. 1, the end surface 11c and the end surface 12d on the fitting direction side of the magnet 11 and the urethane layer 12 are located at the same level in the fitting direction. On the other hand, in the urethane-equipped magnet 7 in FIG. 7, the end surface 12 d on the fitting direction side of the urethane layer 12 is positioned at a level slightly retreated from the end surface 11 c of the magnet 11 in the press-fitting direction.

  According to this, when the urethane-attached magnet 7 is fitted into the fitting hole 21 of the attachment object in FIG. 2, the fitting direction side end is easily introduced into the fitting hole 21 and fitted. Can be combined. About another point, it is the same as that of the case of the magnet 1 with a urethane of FIG.

  FIG. 8 shows a urethane magnet according to the fifth embodiment. In the magnet 1 with urethane in FIG. 1, the side surface 12 e is configured only by a cylindrical surface, whereas in the magnet 8 with urethane in FIG. 8, the side surface 12 e of the urethane layer 12 has a groove 12 f along the length direction. Provided.

  According to this, when the urethane-equipped magnet 8 is fitted into the fitting hole 21 of the attachment object of FIG. 2, the air in the fitting hole 21 easily escapes through the groove 12f, so that fitting is easy. It can be carried out. About another point, it is the same as that of the case of the magnet 1 with a urethane of FIG.

  FIG. 9 shows a magnet with urethane according to the sixth embodiment. In the magnet 6 with urethane in FIG. 6, the side surface 12 e is configured only by a cylindrical surface, whereas in the magnet 9 with urethane in FIG. 9, a spiral protrusion 12 g is provided on the side surface 12 e of the urethane layer 12. It is done. The protruding portion 12 g can be formed integrally with the urethane layer 12 as a part of the urethane layer 12.

  According to this, when the urethane-equipped magnet 9 is fitted into the fitting hole 21 of the attachment object in FIG. 2, the air in the fitting hole 21 easily escapes along the protruding portion 12g. Can be easily performed. About another point, it is the same as that of the case of the magnet 6 with a urethane of FIG.

  FIG. 10 shows a magnet with urethane according to the seventh embodiment. This urethane-equipped magnet 101 is the same as the magnet 5 with urethane shown in FIG. 5 except that the length is shortened and the peripheral portion of one end surface 12h of the urethane 12 is a tapered surface 12i whose diameter decreases toward the end surface 12h. Equivalent to. When a neodymium magnet is used as the magnet 11 of the urethane-equipped magnet 101, the exposed end surfaces 11b and 11c of the magnet 11 are subjected to a surface treatment such as nickel plating in order to protect the surface.

  According to this, when the magnet 101 with urethane is fitted into the fitting hole 21 of the attachment object as shown in FIG. 2, it is easily introduced into the fitting hole 21 from the tapered surface 12i side and fitted. Can be combined. Other configurations are the same as those of the magnet 5 with urethane.

  2 ... Installation object, 1, 5-9, 101 ... Magnet with urethane, 11 ... Magnet, 11a ... Side, 11b, 11c ... End face, 12 ... Urethane layer, 12c, 12i ... Tapered surface, 12f ... Groove, 12g ... Ridge, 21 ... fitting hole.

Claims (5)

  A urethane-equipped magnet that is fitted in a light press-fitted state into a fitting hole provided in an attachment object, and includes a columnar magnet and a urethane layer that covers a side surface of the magnet with a predetermined thickness. This is a magnet with urethane.   The magnet with urethane according to claim 1, wherein one end or both ends of the magnet are covered with the urethane layer together with the side surface.   The outer peripheral part of the edge part by the side of the fitting direction to the said fitting hole is a taper surface from which a diameter reduces toward the end surface of this edge part side, The Claim 1 or 2 characterized by the above-mentioned. Magnet with urethane.   The groove | channel along the length direction is provided in the side surface, The magnet with a urethane of any one of Claims 1-3 characterized by the above-mentioned.   The magnet with urethane according to any one of claims 1 to 3, wherein the magnet is cylindrical, and a spiral protrusion is provided on a side surface of the magnet with urethane.

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