JPS63142613A - Engaging tool - Google Patents

Abstract

PURPOSE:To facilitate the manufacture of various shapes and to improve the attracting force of an engaging tool by forming a projection on both or any one of a ferromagnetic plate attached integrally to a permanent magnet not covered at its periphery with a case, made of a specific material and other ferromagnetic plate, and attracting them through a hole formed at the magnet. CONSTITUTION:A permanent magnet 1 made of rare earth element powder, such as neodymium, iron, boron, etc., and synthetic resin is formed in an annular plate state, and not covered at its periphery with a case, etc. A hole 1a is opened from one pole face (a) toward the other pole face (b), and a ferromagnetic plate 2 is attached integrally to the plate 2. Ferromagnetic projections 3a, 2a protruding from a ferromagnetic plate 3 abutting on the pole face (b) of the magnet 1 and/or from the plate 2 are detachably attracted through the hole 1a to one another or to the plate 2 or 3. Since the magnet has much larger coercive force than a ferrite, an excellent sufficient attracting force is provided. Since the rare earth elements are stably obtained for the materials and can be molded by charging in a cast mold, various shapes can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention allows permanent magnets to be easily manufactured into various shapes by using permanent magnets made of rare earth powder such as samarium or cobalt and synthetic resin.

The present invention relates to an engaging tool that has good suction force even if it is small.

(Prior art) Permanent magnets conventionally used in engagement devices are made by sintering ferrite powder, so even if the outside is covered with a case made of brass, etc., it is easy to break due to impact, etc., and especially if it is small. There are problems in that it is difficult to uniformly fill a mold with a large hole diameter such as a ring shape, and defective products such as warping during sintering are likely to occur.

Therefore, in order to improve this problem, the present applicant has applied for an engaging tool having a permanent magnet made of ferrite powder and synthetic resin.

(Problems to be Solved by the Invention) However, although so-called plastic magnets made of ferrite powder and synthetic resin have good moldability and mWB impact resistance, their magnetic force is weaker than that of conventional sintered ferrite magnets. There was a problem in that the magnet had to be made larger. Therefore, it was unsuitable for small-sized engagement tools.

(Means for Solving the Problems) The present invention was provided to solve the above problems, and provides a permanent magnet having a hole 1a extending from one magnetic pole surface a to the other magnetic pole surface. A ferromagnetic plate 2 is integrally attached to the magnetic pole face a of the ferromagnetic plate 3, and a ferromagnetic plate 3 is in contact with the magnetic pole face 8, and a ferromagnetic protrusion protrudes from either or both of the ferromagnetic plates 2. 3a, 2a are removably attracted to each other or to the ferromagnetic plate 2 or 3 through the hole 1a, and the permanent magnet 1 is made of neodymium.

An engagement tool made of iron, poron-based rare earth powder, and synthetic resin, and at least the peripheral surface of the permanent magnet is not covered with a case or the like.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

1 is a permanent magnet made of neodymium, iron, and poron-based rare earth powder and synthetic resin, which is shaped like a test plate, and has a hole 1a opened from one magnetic pole surface a to the other magnetic pole surface. A ferromagnetic plate 2 is attached to the 81 pole face a, and the magnetic pole face of the permanent magnet 1 is placed inward in a dish-shaped non-magnetic case 4 having a hole 4a communicating with the hole 1a of the permanent magnet 1 at the bottom. The permanent magnet 1 and the ferromagnetic plate 2 are fitted together by a locking claw 4b provided on the edge of the opening of the case 4, thereby forming a female fitting A.

The male tool B for the female tool A is made of a ferromagnetic plate 3, and the engaging tool is made of a ferromagnetic plate 2, 3 as shown in FIG.
ferromagnetic projections 2a from each of the ferromagnetic projections 2a.

The ferromagnetic protrusion 3a of the ferromagnetic plate 3 and the ferromagnetic protrusion 2a of the ferromagnetic plate 2 are attracted to each other in the hole 1a. In some cases, as shown in FIG. In some cases, the ferromagnetic plate 3 is directly attracted to the ferromagnetic plate 2 by providing ferromagnetic protrusions 3a only on the ferromagnetic plate 3, as shown in FIG. 3b in FIG. 2 is a convex peripheral edge provided on the periphery of the ferromagnetic plate 3 in order to prevent the male and female tools B and A from shifting in their engagement positions.

In addition, in Figure tJS4, a ferromagnetic plate 5 is interposed between the magnetic pole face and the case 4 to serve as a shield plate to prevent magnetic leakage from the magnetic pole face. The side periphery is set to 6 edges 1b, and a magnetic recording card or the like in contact with the mirror surface is used as a bridge to prevent it from coming into close contact with the magnetic pole surface.Furthermore, in the case of the one shown in Fig. 6, a ferromagnetic plate 5 is interposed to prevent magnetic leakage. The structure is such that it prevents any adverse effects on magnetic recording cards, magnetic recording tapes, etc.

In addition, when the case 4 is cylindrical as in No. 7 vgJ, and a locking piece 4d is provided at the mouth end on the magnetic pole face side and the permanent magnet 1 is bent flush with the magnetic pole face and held, As shown in FIG. 8, a ferromagnetic plate 5 for magnetic shielding may be fixed to this surface.

In addition, the ferromagnetic protrusions 2a, 3a on the ferromagnetic plate 2.3
are formed integrally with the ferromagnetic plate 2.3, and the ninth
As shown in the figure, the ferromagnetic protrusion 2a is protruded from the ferromagnetic plate 2 by caulking with a small diameter scale part 2a' extending from the protrusion 2a, and the mounting leg 6 is caulked to the ferromagnetic plate 2, or As shown in Fig. 10, one end of the cylindrical body is expanded into a funnel shape and wound around the winding periphery of the washer, and the washer portion of the mounting tube 7 is integrated with the ferromagnetic plate by the small diameter scale portion 2a' of the ferromagnetic protrusion 2a. In some cases, the ferromagnetic plate 2 and the ferromagnetic protrusion 2a are integrally formed as shown in FIGS. Mounting tube 7° expanded or mounting tube 7″ expanded at the open end of the bottomed edge cylinder;
There are cases where the leg 6 as shown in Figure i4 is made into one piece by explosive bonding, soldering, wrapping, etc., and the leg 6 is pierced through the fabric of bags, clothing, etc. and bent, or the mounting tube is 7.7°, 7” into the fabric, press-fit the separately prepared fastening member into this end,
It is designed to be installed by press-fitting.

Further, as shown in FIGS. 13 to 15, the ferromagnetic protrusion 2a
A tapered stepped engagement rod 2b, a screw rod 2b°, and a pin 2b'' are extended to the ferromagnetic plate 2, and are inserted into the hole provided in the center of the ferromagnetic plate 2. At the same time, they are inserted into the fabric, and are prepared separately to suit each. In some cases, the female tool A is attached by attaching a fastening member, and the male tool B is configured in the same manner.

Also, in Figure m16, the magnetic pole face of the permanent magnet 1 of the female tool A is inserted into the hole 1a.
The ferromagnetic plate 3 of the male tool B has a corresponding convex or convex spherical surface to improve the fit of the ferromagnetic protrusion 3a into the hole 1a. FIG. 17 shows an example in which the chain engagement tool for a necklace or the like is used. 8 indicates a chain.

FIG. 18 shows an embodiment in which the permanent magnet 1 and the ferromagnetic plate 2 are integrated by molding, adhesion, fitting, etc. without using the non-magnetic case 4, as shown in FIGS. 19 and 20. The cases in the various embodiments described above may be omitted. In that case, the ferromagnetic plate 5 for magnetic shielding is also integrally attached in the same manner as the ferromagnetic plate 2, and the four edges 4c of the case 4 have four protruding edges facing the magnetic poles.

(Function, Effect) In the engaging tool according to the present invention configured as described above, the permanent magnet is made of neodymium, iron, poron-based rare earth powder and synthetic resin, which have a much larger coercive force than ferrite. Because of this, the adsorption power is large. Therefore, even as a small engaging tool, it has excellent suction power.

In addition, rare earth materials such as neodymium, iron, and poron are stably available as raw materials, and permanent magnets using them are relatively inexpensive.
Molding can be done by pouring into a mold, so it is easy to make various shapes, and unlike sintered ferrite magnets, there is no deformation or cracking, so there are fewer defective products. Since the powder particles are solidified with synthetic resin without any gaps, in the case of an engagement tool covered with a case, the plating solution enters the gaps between the ferrite powders during the plating process of the case after assembly, as with conventional sintered ferrite magnets. It does not flow out and create black stains on the case, and the plating process is finished beautifully.

[Brief explanation of the drawing]

FIGS. 1 to 3 are sectional views showing the basic structure of the engaging tool according to the present invention, FIGS. 4 to 8 are sectional views of various embodiments of the female fitting, and FIGS. 9 to 15. is a ferromagnetic plate, a ferromagnetic protrusion,
16 to 20 are sectional views of various embodiments showing the configuration of the mounting member, and FIGS. 16 to 20 are sectional views of other embodiments of the engagement tool. 1... Permanent magnet, 1a... Hole, 2.3... Ferromagnetic plate, 2a, 3a... Ferromagnetic protrusion, 2a°... Small diameter weighing part, 2b... Taper step Engagement rod, 2c...screw rod,
2d... Bottle, 4... Case, 4a... Hole, 4b
... Locking piece, 4c... Four edges, 4d... Locking piece, 5
...Ferromagnetic plate, 6...Legs, 7...Mounting tube, 8...
・Chain, A...female tool, B...male tool, a, b...
・Magnetic pole surface. Figure l Figure a, b...Magnetic pole face 4b...Couple 11=, Ii' Figure 5 Figure 6 Cause and effect
7 Figure 8 Figure Ar1
Figure 10 Figure II @ /2
Cause and Effect 13 Figure 1
/4 Cause and effect 15 Figure 16 Figure 17 Cause and effect Figure 18 Figure 20

Claims (1)

[Claims] A ferromagnetic plate 2 is integrally attached to the magnetic pole face a of a permanent magnet 1 having a hole 1a extending from one magnetic pole face a to the other magnetic pole face b, and a ferromagnetic plate 3 is brought into contact with the magnetic pole face b. , ferromagnetic protrusions 3a, 2a protruding from either or both of the ferromagnetic plate 2 are removably attracted to each other or to the ferromagnetic plate 2 or 3 via the hole 1a, The engagement tool is characterized in that the permanent magnet 1 is made of neodymium, iron, boron-based rare earth powder and synthetic resin, and at least the peripheral surface of the permanent magnet is not covered with a case or the like.