JPS5949996B2 - Engagement tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention eliminates any magnetic shielding in an engaging tool using a permanent magnet, especially leakage magnetism at the outer circumferential side, and prevents accidents caused by leakage magnetism, especially magnetism. The present invention relates to the disclosure of an engaging structure that reliably prevents destruction of recording parts of tapes, magnetic cash cards, credit cards, member skirts, various magnetic admission tickets, train tickets, etc.

Therefore, in the past, this type of engagement device generally did not have a magnetic shield structure, and even when it did have it, it was only partial, so it was often difficult to use magnetic tape, cash cards, etc. The magnetic records stored on these tapes and cards are destroyed by contact with or proximity to the engaging tool.

The present invention has been proposed with the aim of eliminating the disadvantages of the prior art, and provides a magnetic path in a portion where leakage magnetism is likely to occur, and a shield that serves as this magnetic path. The surface of the plate 3 is coated with a non-magnetic material so that there is no room for the magnetic flux to come into direct contact with the magnetic tape, etc., at least in the state of engagement with the plate 5. , T is erected with a magnetic gap apart from the hole 1a to form an effective magnetic path with extremely low magnetic resistance to prevent magnetic leakage to the outside and to further improve the magnetic attachment effect. be.

The details of the engaging tool according to the present invention will be described below with reference to a typical embodiment shown in the drawings. Reference numeral 1 denotes a permanent magnet, and one or more magnets are attached to one magnetic pole surface from the other magnetic pole surface. A hole 1a is opened to reach the hole 1a. A ferromagnetic plate 2 is attached to one of the magnetic pole faces of this magnet 1, and a ferromagnetic plate 3 is attached to the other magnetic pole face except for the hole 1a, and a cylindrical case 4 made of a non-magnetic material is attached. The plate 3 forms a magnetic path on the magnetic pole surface of the magnet 1,
In addition to preventing magnetic leakage from the magnetic pole surface, the circumferential side edge is extended to the side of the plate 2 to form a side shield plate part 3a, eliminating any magnetic leakage from the circumferential side of the engagement tool. It was designed to tighten it.

The side shield plate 3a is installed with a magnetic gap 8 interposed between it and the magnet 1 to prevent a short circuit, and is a cylindrical case having a rim 4a raised on the plate 3 surface. 4, and is integrally connected to the magnet 1 etc. by bending the locking piece 4b in the case 4.

In addition, in FIG. 1, a mounting washer 9 having folded leg pieces 9a to 9a for separately attaching to a base plate such as a handbag is fitted into the case 4, and is integrally fixed with a locking piece 4b. This is the one that constitutes one engagement member a.

Next, the other engaging tool b is attached to the edge 4a of the case 4.
A ferromagnetic plate 5 having a diameter that fits within the 3-sided soil and is magnetically attached to the soil on the 3rd side of the plate, and a ferromagnetic plate 5 that protrudes from the 5th side of the plate and is magnetically attached to the 2nd side of the plate through the hole 1a. It is composed of a ferromagnetic rod 6 and a mounting washer 9 having bent leg pieces 9a to 9a which are caulked together with the plate 5 using the small diameter rod portion of the rod 6.

．． In the embodiment shown in FIG. 2, the rod 6 has a length that reaches the middle of the hole 1a, and a corresponding rod T is erected on the surface of the plate 2 and caulked. An example is shown in which the rod 6 in FIG. 1 is shortened to facilitate fitting of the rod 6 into the hole 1a of the magnet 1, and the example shown in FIG. 3 omits the rod 6, Instead, the rod 7 has a length that reaches the upper edge of the opening of the plate 3, and since there is no rod 6 which is a protruding part on the engaging tool b, it can be slid and engaged with the engaging tool a. Even when the engaging tool b is not engaged, the rod T, plate 3, and magnet 1 constitute a magnetic closed circuit, effectively preventing magnetic leakage.

The rods 6 and 7 are both interposed with a considerable magnetic gap between them and the inner circumferential wall surface of the hole 1a of the magnet 1, so as to suppress the attenuation of the magnetic effect due to magnetic short circuit as much as possible. The periphery of the contact end surface is rounded, the actual contact end surface of the rods 6 and T is made smaller than the rod diameter, and the magnetic flux distribution density passing through the contact end surface is further increased to improve the magnetic adhesion effect on the magnet 1. This is to make it even higher.

Furthermore, since all the magnetic flux on one magnetic pole surface of the magnet 1 is focused on the rod 6 and T through the plate 3, the magnetic flux of the magnet 1 having a predetermined number of magnetic fluxes is This is because the best magnetic state is created.

In addition, this function of the plate 3 is such that even if iron sand etc. enters the hole 1a, magnetism is generated between the hole edge of the plate 3 and the edge of the rod T, so that the end surface of the rod T itself is made of iron sand. Adhesion is avoided,
This allows reliable contact with the rod 6 and plate 5.
Furthermore, the peripheral side of the magnet 1 is a side shield plate portion 3a.
constitutes a magnetic path, and by providing a sufficient magnetic gap 8 between plate portion 3a and plate 2, the main magnetic path of magnet 1 is concentrated in rod 6 and T portion. At the same time, the lines of magnetic force slightly generated at the outer periphery of the magnet 1 reach the plate 2 using this plate part 3a as a passage, and there is no magnetic leakage from this part.

Therefore, by covering the plate portion 3a with the case 4, destruction of the magnetic recording portion is completely prevented even when a magnetic tape, a magnetic card, etc. is brought into direct contact with this engaging tool. It is something.

In particular, when it comes to contacting this magnetic tape, etc., the plate 5 is connected to the edge 4.
By having a structure that fits within a, these engaging tools do not require any mechanical contact such as tape when in engagement use.

Furthermore, even when the engaging tool b is released, the presence of the edge flange 4a prevents magnetic tapes, magnetic cards, etc. from directly touching the surface of the plate 3, and instead forms a bridging position on the edge flange 4a. The magnetic tape passes over the A-side, and even under such conditions, damage to the magnetic tape, etc. is almost completely prevented. Next, in the embodiment shown in FIG. 4, the edge of the hole in the plate 3vc is folded into the hole 1a as an edge flange 3b, so that there is no room for magnetic leakage in the hole 1a. This is what I did.

Further, in the embodiment shown in FIG. 5, the plate 3 and
The end surface of the plate 5 is made into a concave spherical shape or a convex spherical shape, so that the rod 6 can be inserted into the hole 1a while sliding to improve fitting performance and to improve the plating on the spherical part. It is something.

Next, in the embodiment shown in FIG. 6, the contact end surface between the rod 6 and the rod T is made into a spherical shape, so that even when the plate 5 is tilted, the rods 6 and 7 are not immediately separated, and the contact spherical surface is maintained. The structure is such that the magnetically attached state is maintained in either of the above conditions. In the embodiment shown in FIG. 7, the rod 7 in such a structure is omitted, and the plate 2 forms a concave spherical concave portion in which the concave spherical end surface of the rod 6 directly slides. It is something.

As mentioned above, the present invention contemplates various design changes in terms of shape and mounting.

The engaging tool according to the present invention has a permanent magnet 1 with a hole 1a opened from one magnetic pole surface to the other magnetic pole surface, and a ferromagnetic plate 2 on one magnetic pole surface, and a ferromagnetic plate 2 on the other magnetic pole surface excluding the hole 1a. A plate 3 is attached, and the permanent magnet 1 and plates 2, 3 are fitted and fixed into a cylindrical non-magnetic case 4 having an inner peripheral flange 4a, and the magnet can be attached and removed on the surface of the plate 3. The ferromagnetic plate 5 in contact with the plate 2 and the ferromagnetic rods 6, 7 protruding from one or both of the plates 2 are magnetized to the other ferromagnetic plate 2, 5 or the rods 6, 7 through the hole 1a. In a structure in which the plates 3 are brought into contact with each other in a detachable manner, the outer peripheral edge of the plate 3 is bent and extended to the side of the X plate 2 with a magnetic gap 8 between it and the outer circumferential surface of the magnet 1. With this structure, the following excellent effects are guaranteed.

1 The ferromagnetic plates 3 and 5 are strongly magnetized by forming a magnetic path in which magnetic flux is focused by the ferromagnetic rods 6 and 7, and the engaging tool a
and b securely engage.

The magnetic gap 8 provided between the side shield plate 3a, which is the outer peripheral edge of the two plates 3, and the outer circumferential surface of the magnet 1 forms a magnetic path consisting of the magnet 1, the plate 3, the side shield plate 3a1, and the plate 2. This prevents the magnetic flux from passing through the passage and the number of magnetic fluxes passing through the rod 6 from decreasing, so that the plate 2 is effectively magnetically attached to the rod 6 and strongly engaged, and the interposition of the rod 6 is prevented. When not equipped, the magnetic path between the two magnetic pole faces is formed through the gap 8 with the least resistance, and in particular, all the magnetic flux is focused to prevent magnetic leakage to the outside.

3 In addition to the effect of 2 above, since it is covered with a non-magnetic case 4, there is no magnetic leakage to the outside, and even if a magnetic tape, magnetic card, etc. is brought into direct contact with this engaging tool, the magnetic recording part will not be completely destroyed. Since the plate 5 is housed within the edge flange 4a in the engaged state, it is possible to completely prevent contact with the tape, etc., and in the disengaged state. The edge flange 4a of the non-magnetic case 4 raised above the surface of the plate 3 acts as a bridge for the magnetic card, preventing it from coming into direct contact with the card, and the gap corresponding to the thickness of the edge flange 4a prevents damage to the magnetic recording portion. be done.

4. It is possible to downsize the engaging tool due to the strong magnetic attraction effect, and contributes to cost reduction by saving materials.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the engaging tool according to the present invention;
2 to 7 are cross-sectional views showing other embodiments. In addition, in the figure, 1... magnet, 2-3... ferromagnetic plate, 4... case, 5... ferromagnetic plate, 6-7... ... Ferromagnetic rod, 8 ... Magnetic gap, 9 ... Mounting washer.

Claims (1)

[Scope of Claims] 1 A ferromagnetic plate 2 is attached to one magnetic pole surface of a permanent magnet 1 having a hole 1a opened from one magnetic pole surface to the other magnetic pole surface.
A ferromagnetic plate 3 is attached to the other magnetic pole surface except for a, and the permanent magnet 1 and plates 2, 3 are fitted and fixed into a cylindrical non-magnetic case 4 having an inner peripheral flange 4a. The ferromagnetic plate 5, which is magnetically and removably abutted on the surface of the plate 3 at the same time, and the ferromagnetic rods 6, 7 protruding from one or both of the plates 2 are inserted into the other ferromagnetic plate through the hole 1a. 2, 5 or rods 6, 7, the outer peripheral edge of the plate 3 is placed on the side of the plate 2 with a magnetic gap 8 between it and the outer circumferential surface of the magnet 1. An engagement tool characterized in that it can be bent and extended until it reaches both sides. 2. The engagement tool according to claim 1, characterized in that the edge flange 4a of the case 4 is an engaging edge flange for the plate 5 which is raised on the surface of the plate 3. 3. The engagement tool according to claim 1, characterized in that a magnetic gap is provided between the ferromagnetic rods 6, 7 and the inner circumferential wall surface of the hole 1a of the magnet 1.