JPS6224602A - Hanging tool - Google Patents

Abstract

PURPOSE:To obtain a hanging tool superior in dimensional precision, large in absorptive force, and low in cost, by forming a permanent magnet of synthetic resin or rubber containing rigid magnetic powders, in a sheet shape, with at least one face of it sanding-processed and punched. CONSTITUTION:A permanent magnet 1 is formed in a circular plate shape, with a hole 1a made in an axial center between magnetic polar surfaces (a) and (b), and circular plate-shaped ferromagnetic members 2 and 3 having salient parts 2a and 3a at the respective centers are made in contact with the magnetic surfaces (a) and (b), so that the salient parts 2a and 3a are inserted into the hole 1a of the permanent magnet 1 with fixed space against its inner surrounding surface, and then jointed and absorbed to each other to compose a magnetic path. The permanent magnet 1 is made of synthetic resin or rubber containing ferrite, alnico, cobalt rare earth elements, and other rigid magnetic powders, and formed in a sheet shape by extrusion-or roll-molding, with one face, of both faces, dependent on the recessed and projecting conditions of the surface, being sanding-processed, and then punched to compose a circular plate 1' having a hole 1a at the central part.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention uses a permanent magnet, and the hook is configured so that the protrusions of a ferromagnetic member attached to both magnetic pole faces are brought into contact with each other in a hole of the magnet and are attracted to each other. In the stop.

The present invention relates to a latching tool in which the permanent magnet is made easy to obtain dimensional accuracy and the adsorption efficiency is increased.

(Prior art) As shown in Fig. 8, a conventional holder using a permanent magnet has a hole a in the direction of the magnetic pole surface in the permanent magnet A, and the holder is attached to both magnetic pole surfaces in the hole a. Projection B of the ferromagnetic member
, C are butted against each other to form a magnetic path, which attracts the tail.

(Problem to be Solved by the Invention) However, if the thickness of the permanent magnet A is larger than the total length of the protruding portions B and C of the ferromagnetic member, the protruding portion B,
A gap is created between the C tips, reducing the adsorption force. Especially when using small, thin-walled permanent magnets with a small amount of magnetism, if a gear is formed in this area, the adsorption force decreases, making it unsuitable for use. Therefore, in the past, a case was made to integrally cover the permanent magnet A and one of the ferromagnetic members attached to it, and the ferromagnetic member that became the magnetic path was fully bent, so it was manufactured with high precision in the dimensions of each part. On the other hand, permanent magnet A is generally a sintered ferrite magnet, and this sintered ferrite magnet is made of ferrite in a mold with a core for providing a hole in the center. The powder is passed through a sieve and then pressed and sintered, and in the case of small products, it is difficult to drop the ferrite powder on average, and molding distortion is likely to occur as shown in the figure. The drawback is that it is difficult to achieve dimensional accuracy, and for this reason, ferrite magnets were polished one by one after molding, but the ferrite magnets themselves are expensive, the cost is even higher, and there are also variations in polishing. There were some problems, such as being easy to use.

(Means for Solving the Problems) The present invention solves the above problems and provides a fastening tool that uses permanent magnets that are easy to manufacture and easy to achieve dimensional accuracy, and has high adsorption efficiency. A hole 1a is opened in the direction of the magnetic pole surfaces a and b, and the protrusions 2a and 3a of the ferromagnetic member 2.3 attached to both the magnetic pole surfaces a and b are abutted in the hole 1a and magnetically generated. The permanent magnets 1 of the latching device are made of a sheet made of synthetic resin or rubber containing hard magnetic powder, and one or both sides of the permanent magnets are sanded. It is a hanging tool made by stamping and punching.

(Function) Since the permanent magnet is made by incorporating hard magnetic powder into synthetic resin or rubber, it is not brittle, will not warp or chip, and can be easily processed by roll molding, extrusion molding, etc. Once formed into a sheet, it is possible to sand one or both sides, and there is no molding distortion, and the dimensions of each magnet can be uniformly accurate.

(Embodiment) Fig. 1 shows a basic embodiment of the present invention, where ■ indicates a permanent magnet, and a hole 1a is provided at the axis between the magnetic pole faces a and b to form a top plate shape. A ferromagnetic member 2.3 in the form of a disk having protrusions 2a and 3a in the center, respectively, is attached to a and b, and the protrusions 2a and 3a are inserted into the hole la of the permanent magnet 1 on its inner periphery. It is a latching tool that is inserted at a predetermined distance from the surface and abutted to form a magnetic path so that they attract each other, and the permanent magnet 1 contains hard magnetic powder such as ferrite, alnico, cobalt rare earth, etc. It is made of synthetic resin or rubber, and is formed into a sheet by extrusion or roll forming as shown in Figure 2, and after sanding one side or both sides depending on the unevenness of the surface, punching, and forming a sheet in the center. It is made of a single plate with a hole 1a drilled in it and bound at 1°, and magnetization can be done either when it is in the form of a sheet or after it is punched out.

FIG. 3 shows that a permanent magnet 1 and a ferromagnetic member 2 attached thereto are covered with a case 4 to integrate them, and the ferromagnetic member 2
．． 3, the protrusions 2a, 3a are formed separately from the plate parts 2b, 3b, and the plate parts 2b, 3b are caulked, and at the same time, a fastening member 5.6 in the form of a washer with a leg piece is provided for attaching to a mounting board, etc. Each is crimped.

In Fig. 4, the ferromagnetic member 2 is provided with no protrusion 2a, only a disk-shaped plate portion 2b, and the length is such that the protrusion 3a of the ferromagnetic member 3 can be directly attracted to the plate portion 2b. Magnetic member 2
A fastening member 5 is welded to.

In Fig. 5, the protrusion of the ferromagnetic member 3 is not provided.
The protruding portion 2a of the ferromagnetic member 3 has a length that can be directly attracted to the plate portion 3b of the ferromagnetic member 3, and the peripheral edge of the case 4 facing the magnetic pole is a protruding edge 4a that protrudes in the axial direction of the permanent magnet l. The magnetic recording card that comes into contact with the magnetic pole face is supported by the projecting edge 4a to prevent surface contact, and a ferromagnetic magnetic shield plate 7 is interposed between the magnetic pole face and the case 4 to prevent the magnetic recording card from coming into contact with the magnetic pole face. This prevents leakage of magnetism from the glass and completely eliminates the negative influence of magnetism on the magnetic recording card, and also prevents the plate portion 3 of the ferromagnetic member 3 from shifting from the contact position due to the protruding edge 4a. It is something that has been eliminated. FIG. 6 shows that the magnetic shield plate 7 attached to the s11a prevents magnetic leakage and has almost no effect on approaching magnetic recording cards, and the protrusions 2a and 3a of the ferromagnetic member 2.3 are This is an embodiment in which it is inserted into the center of the plate part and assembled, and the protruding push parts 2c and 3c are provided with male threads, and are screwed into female threaded holes of a mounting board or the like to be fixed. The pressing portion 2C13C may be a wood screw or may be bottle-shaped. Other fastening means include a pipe-shaped fastening member 5.6 with one end of the plate portion 2b, 3bp of the ferromagnetic member 2.3 closed, or a pipe-like fastening member 5.6 with the other end shaped like a trumpet. It is attached by welding the expanded end, or by caulking a washer with the end wrapped around the periphery, and one end of the fastening members 5, 6 is pushed into a hole made in the mounting board of the fastener. The protruding end is made to protrude from the substrate surface, and the protruding end is expanded and caulked, and a decorative button body, a flanged body, etc. is press-fitted into the open end, or the inner hole is fixed. A female thread is cut into the hole and a flanged bolt is screwed in to fix the fixing member, or a closed pipe-shaped fixing member 5.6 is pushed into the mounting member having the expansion chamber and fitted into the forming chamber. A type that can be expanded and fixed with a button is used.

FIG. 7 shows an embodiment of a latching device that is also used for connecting chains, strings, etc. of necklaces, etc., and the ferromagnetic members 2 and 3 are both formed by integrally molding a protrusion and a plate. A chain or the like can be attached to holes 2d and 3d formed at one end of the plate.

(Effects) The hanging device according to the present invention is configured as described above, and in particular, the permanent magnet is first formed into a sheet shape, so there is no need to cast it into a mold, and it can be manufactured by extrusion or roll forming. Next, since the sheet is simply sanded and punched, there is no molding distortion, and mass production is easy and cost is low.

2. Since the maximum amount of magnetic powder can be mixed in, there is almost no difference in the amount of magnetization compared to sintered ferrite magnets.

3. Since the magnetic powder is linked by synthetic resin or rubber, cracks and chips do not occur unlike ferrite sintered magnets.

4. Since it can be polished when it is in sheet form, it is possible to uniformly polish a large number of magnets in a short time, and it is efficient and can achieve dimensional accuracy of up to ±1/100, In good condition.

Therefore, since the dimensional accuracy of the permanent magnet is good, the suction efficiency of the hook is maximized, and the suction force is good. Furthermore, there is no possibility that the magnet will chip or crack within the hook, increasing magnetic resistance and reducing the attraction force. Furthermore, since the cost of permanent magnets is low, latches can also be provided at low cost, and in particular, latches can be made thin, small, and in various shapes. It can be used as a better hanging device.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a basic embodiment of the present invention, Fig. 2 is an explanatory diagram showing the process of forming the permanent magnet, and Figs. 3 to 7 are cross-sections of various other embodiments of the hanging tool. 8 are sectional views of the conventional example. 1... Permanent magnet, 2.3... Ferromagnetic member, 4...
Case, 5.6... Correct attachment member, 7... Magnetic shield Fig. 2 Fig. l Fig. 3 Fig. 4 Fig. 6 Fig. C 8.

Claims (1)

[Claims] A hanging tool in which a hole is opened in the direction of the magnetic poles, and the protrusions of the ferromagnetic member attached to both magnetic pole faces are butted together in the hole to form a magnetic path and are attracted to each other. A permanent magnet, the permanent magnet is made of synthetic resin or rubber containing hard magnetic powder, and is formed into a sheet shape,
A latching device characterized in that at least one side thereof is sanded and punched.