JPS6255908A - Connection fixture - Google Patents

Abstract

PURPOSE:To allow one piece molding of a connection fixture by a method wherein a permanent magnet is formed by setting a ferromagnetic member in a mold and filling synthetic resin containing hard magnetic powder in it, and the circumferential plane of the projection of the ferromagnetic member is filled with synthetic resin as the one piece. CONSTITUTION:A circular-plate-shaped permanent magnet 1 made of synthetic resin containing hard magnetic powder is molded as one piece together with a projection 2a at the center and a ferromagnetic member 2 having a circular plate 2b with the same diameter as that of the magnet 1. For example, a member 2 is set in a split mold M so that the plate 2b closely contacts the inside bottom, and the molding is done by filling synthetic resin. Then, a female fixture A is made by magnetizing so that the plate section 2b side of the member is to be a magnetic pole surface a, and the other side is to be a magnetic pole face b. A male fixture B consisting of a plate-shaped ferromagnetic member 3 and is attracted to the projection 2a of the member 2 to be fastened, closely contacting the magnetic pole face b of the magnet 1 on the female fixture A, thereby making it possible to form the connection fixture as one piece.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention uses a plastic magnet as the permanent magnet of an engaging tool that uses a permanent magnet, and can be integrally molded using a mold with a simple shape. The present invention relates to an engagement tool that can be provided at a low cost.

(Prior art) As shown in No. 9 [4], a conventional engagement tool using a permanent magnet has a hole 1a extending from one magnetic pole surface a to the other magnetic pole surface.
A ferromagnetic member 2 consisting of a protruding rod part 2a and a ferromagnetic member 3 abutting the other magnetic pole face are connected to the plate part 2b attached to one magnetic pole face a of the permanent magnet 1 provided with the permanent magnet 1. Hole 1a of magnet 1
It is removably attracted via the permanent magnet 1.
Since the lines of magnetic force pass through the contact portion of the ferromagnetic member 2 with the protruding rod portion 2a, a circuit of magnetic lines of force that generates a strong attraction force is not formed, so that a gap C is created between the protruding rod portion 2a and the inner circumference of the hole 1a. It was designed to prevent short circuits during this period.

(Problem to be solved by the invention) However, the permanent magnet 1 of the engaging tool can be molded by simply filling it in a mold, and the cost can be reduced, so in recent years, synthetic resin has been increasingly used. However, there were problems with synthetic resin molding as described below.

That is, a mold is required to provide the gap C shown in FIG. 9, and because of this gap, the number of magnet components is reduced, and as the engaging tool becomes smaller, the attraction force is affected.

Furthermore, in order to ensure the integration of the ferromagnetic member 2 with the permanent magnet 1, it is necessary to provide a casting space d below the periphery of the plate portion 2b of the ferromagnetic member 2, and the periphery of the wire portion 2b is processed for this purpose. In short, it is also necessary to consider the setting position of the ferromagnetic member within the mold.

(Means for Solving the Problems) This invention solves the above problems, and in order to make the structure of the mold simple and easy to mold, and to further reduce the cost, one magnetic pole surface is fixed as shown in FIG. A ferromagnetic member 2 consisting of a plate portion 2b attached to the magnetic pole surface a of a permanent magnet l having a hole 1a extending from a toward the other magnetic pole surface, and a protruding rod portion 2a located within the hole 1a, and the magnetic pole surface. In the engagement tool, the ferromagnetic member 3 that comes into contact with the permanent magnet 1 is removably attracted 71' through the hole 1a of the permanent magnet 1. The ferromagnetic member 2 is set in the mold of the permanent magnet 1, A synthetic resin containing hard magnetic powder is injected and molded, and the synthetic resin is integrally filled into the peripheral surface of the protruding rod portion 2a of the ferromagnetic member 2.

(Function) The engaging tool configured as described in 1- has a simple mold shape, requires low mold cost, and is easy to mold with fewer mistakes. Moreover, the ferromagnetic member 2 has a permanent magnet l on the circumferential surface of the protruding rod portion 2a.
Since it is in close contact with the synthetic resin that forms it, it is a reliable integration. However, the adsorption force of the engaging tool does not decrease significantly compared to the conventional one.

(Embodiment) Fig. 1 shows an embodiment of the present invention, in which the engagement tool consists of a female tool A and a male tool B, and ■ is a top plate-shaped permanent magnet made of synthetic resin containing hard magnetic powder. , center protrusion 2
a and a ferromagnetic member 2 having a disc-shaped plate portion 2b having the same diameter as the permanent magnet 1. For example, the ferromagnetic member 2 is placed in a split mold M as shown in FIG. When the plate part 2b is set so as to be in close contact with the inner bottom surface of the mold, and the synthetic resin is filled and molded, and the injected synthetic resin is prevented from going under the plate part 2b. and board part 2
In some cases, b is slightly raised above the inner bottom surface of the mold so that it rotates downward. Thus, the ferromagnetic member 2 is magnetized so that the plate portion 2b side faces the magnetic pole face a, and the other side faces the magnetic pole face, thereby forming a female tool A and a male tool B as the plate-shaped ferromagnetic member 3. It comes into contact with the magnetic pole face of the permanent magnet 1 of the female tool A, and is adapted to attract and engage with the protruding rod portion 2a of the ferromagnetic member 2.

3' is a protrusion provided on the periphery of the ferromagnetic member 3 to ensure an appropriate adhesion position during engagement and to prevent lateral displacement.

FIG. 3 shows another embodiment of the ferromagnetic members 2 of female tool A and male tool B.
3 each consist of protruding rod parts 2a, 3a and plate parts 2b, 3b, and a ferromagnetic member 2.3 is inserted through a hole 1a provided in the permanent magnet 1 from the end face of the protruding rod part 2a to the magnetic pole face. It is configured to be engaged by attraction.

In Fig. 4, the protruding rod part 2a of the ferromagnetic member 2 is made as short as possible, and the protruding rod part 3a is lengthened accordingly. This embodiment prevents lateral displacement and ensures reliable locking, and is particularly suitable when the retainer is thin, that is, the permanent magnet 1 is thin.

In Fig. 5, an annular protruding edge 1b is provided on the periphery of the magnetic pole face of the permanent magnet l, which prevents the ferromagnetic member 3 of the ΔE tool B from laterally shifting from the engaged position, and also prevents the magnetic pole face from shifting laterally from the engaged position. The ridge 1 prevents the magnetic recording from being destroyed if magnetic recording cards come into close contact with the
Fig. 6 shows a magnetic shield plate 5 made of a ferromagnetic plate on the magnetic pole face of the permanent magnet 1.
are buried together to prevent magnetic leakage from the surface,
This embodiment is designed to prevent destruction of records on magnetic recording cards that are in contact with the surface, and by combining it with the embodiment shown in FIG. 5, the effect described in F can be further improved. .

FIG. 7 shows that the ferromagnetic members 2.3 are both separate projecting rod portions 2a,
3a and plate parts 2b, 3b, the small diameter scale part provided on the protruding rod parts 2a, 3a is connected to the plate parts 2b, 3b.
This is an embodiment in which a washer-shaped fastening member 4 having a bent fastening leg piece is fixed at the same time by inserting it into a hole opened and caulking it.

Fig. 8 shows various embodiments of the indigenous member 4 in the L-type engaging tool, in which (a) is a washer-like structure having two bent and fastening leg pieces 4a, which fit into holes drilled in the fabric of bags, etc. The leg pieces 4a are inserted and protruded, and are fastened by bending them along the fabric surface.

(b), (c), and (d) are all cylindrical fitting members 4, one end of which is expanded into a trumpet shape;
Alternatively, the expanded edge is wound around a washer 4b having a wound peripheral edge, and (a), (b), (c), and (d) all show the plate portion 2b of the ferromagnetic members 2 and 3, The expanded end on the back side of the suction surface of 3b is fixed by welding, brazing, etc., or the washer is welded or caulking with nails, etc. (especially when the protruding rod part and plate part of the ferromagnetic member are It is a separate item, and when it is caulked to the plate part by a small diameter scale part extending from the protruding rod part and integrated, this is often used to caulk the lJx attachment member 4. .) One end of the other open or closed 11 is inserted into a mounting hole made in the fabric, etc., a decorative button having a hollow part for caulking is attached to the protruding end, and expanded within the hollow part, i.e. It is fixed by caulking or by inserting a washer-like clasp and caulking.

In addition, (e) and (f) assume that the ferromagnetic member 2.3 consists of separate projecting rod portions 2a, 3a and plate portions 2b, 3b, and a small diameter scale portion 2C13C is attached to the projecting rod portions 2a, 3a. Extend (e)
(f) has a needle-like tip and is inserted into a hole opened in the center of the plate parts 2b, 3b to form the ferromagnetic members 2, 3, and an engaging member is attached thereto. It is inserted into a mounting hole provided in a mounting board, etc., and tightened with a nut, or it is inserted into the mounting board and attached to 1b. (g)
This is an example of a fastening member for a stopper such as a chain of a necklace, and one end of the plate parts 2b and 3b of the ferromagnetic member 2.3 is extended to form holes 2d and 3d for chain connection, and a button is connected. It is something.

(Effects) The present invention is constructed as described above, and in particular, the ferromagnetic member 2 is placed in a mold of the permanent stone 1, which is then filled with a synthetic resin containing hard magnetic powder and molded. Since at least the peripheral surface of the protruding rod part 2a of the ferromagnetic member 2 is integrally filled with the synthetic resin, the protruding rod part of the ferromagnetic member 2 is gripped by a permanent magnet on its peripheral surface. This ensures that the permanent magnet and the ferromagnetic member are integrated, and there is no fear that they will separate.

Furthermore, the structure of the mold is simple and simple, and the cost of the mold is low, so the cost of the engaging tool is low.

Furthermore, since the structure of the mold is simple, it is easy to set the mold, it is easy to remove the mold after molding, and there are no molding mistakes.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a typical embodiment of the engaging tool according to the present invention, FIG. 2 is a cross-sectional view of a mold showing the state of molding of the permanent magnet of the engaging tool, and FIGS. 3 to 7 8 is a sectional view of various other embodiments of the rotation engagement device, FIG. 8 is a sectional view of various embodiments of the correct attachment member of the rotation engagement tool, and FIG. 9 is a sectional view of a conventional example. ■...Permanent magnet, 1a...hole, 2.3...ferromagnetic part, 21.3a...culm part, 2b, 3b...plate parts a, b...magnetic pole surface , 4...u second member.

Claims (1)

[Scope of Claims] A plate portion 2b attached to the magnetic pole surface a of the permanent magnet 1 having a hole 1a extending from one magnetic pole surface a to the other magnetic pole surface b, and a protruding rod portion 2a located within the hole 1a. In this engagement tool, a ferromagnetic member 2 made of The ferromagnetic member 2 is set therein, and a synthetic resin containing hard magnetic powder is filled and molded, and at least the peripheral surface of the protruding rod portion 2a of the ferromagnetic member 2 is integrally filled with the synthetic resin. An engagement tool characterized by: