JPS5918615A - Engagement device - Google Patents

Abstract

PURPOSE:To obtain a magnetic path which does not allow magnetic leakage by attaching a ferromagnetic plate to the lower surface of a magnet provided with a hole at the center, forming a mounded part within the hole by drawing process, also forming a mounded part also on the ferromagnetic plate located on the magnet and causing the end parts of these two mounded parts to abut against each other. CONSTITUTION:A hole 1a is bored to a permanent magnet 1 through the front and rear magnetic surfaces, a ferromagnetic plate 2 is attached to the rear polar surface and these are integratingly fixed within a case 5. In such a structure, the case 5 is composed of a non-magnetic material and is formed like an inverted sourcer. A hole 5a having the edge collar connected to the hole 1a is provided on the surface of such case, and moreover the edge of end part of case 5 is folded and is located as the edge of end 5b of the ferromagnetic plate 2. The area of ferromagnetic plate 2 opposing to the hole 1a is drawn and is protruded into the hole 1a and an caulking tube 4 is pressurizingly inserted into the generated mounted part 2a from the outside. Next, a ferromagnetic plate 3 providing the mounted part 3d formed by the drawing process is located on the magnet 1, the culking tube 4 is pressurizingly inserted into the inside of mounted part 3a and the mounded parts 3d and 5d are abutted against each other.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a means for attaching an engaging tool using a permanent magnet, in particular, a simple attachment by press-fitting, manufacturing by a structure, and an assembly method that reduces costs and improves molding strength. The present invention relates to an engagement tool in which a thin part of a magnetic sheet plate is reinforced to specifically form a magnetic closed circuit with low magnetic resistance.

Therefore, the attachment means in conventional engagement tools of this type generally consists of a ferromagnetic protrusion that is attached to a hole in a magnet, and
The thin frame portion of a similar protrusion is attached to a ferromagnetic plate serving as a male tool, and the washer and the like are attached by one weight.

However, in such a method, the protrusion is molded into a unique f, y pin shape with an enlarged head end, and furthermore, after the protrusion is inserted through a ferromagnetic plate or washer, etc. It requires caulking, which requires only one piece, and the molding costs and assembly costs are inevitably high.

In view of the inconveniences in the prior art, the present invention provides an engaging tool that can be attracted or fixed to a magnet without preparing a separate material for forming the protrusions. By inserting the magnetic plate itself into the bulge using a method such as squeezing out, we aim to reduce the cost of the molding material, and at the same time, by using the aperture hole in this bulge, the parts can be simply press-fitted into the hole. The assembly is done in a fixed manner to reduce costs.

In particular, in the retainer according to the present invention, the cost reduction (the thinning of the plate itself caused by this, especially the thinning of the bulge end part) makes the magnetic field line effective. By ensuring the desired thickness and thickness, a magnetic path with no wasted magnetic lines of force, that is, with little leakage, is constructed.

Hereinafter, a typical embodiment of the engaging tool according to the present invention will be explained with reference to the attached drawings. A ferromagnetic plate (2) is attached to the magnetic pole surface of the
The plate L7 is designed to hold and hold the case (5) under one weight.

The case (5) is made of a non-magnetic material, has an inverted dish shape, and has a hole (communicating with the previous hole 11a) in the bottom surface of the case (5).
Moreover, the wire hole (a hole with a rim that engages with the circumferential surface of Ila) (
5) A is opened, and the opening edge has an integral claw (51b) which is bent and fixed onto the surface of the plate (2).

The ferromagnetic rod (2) attached to the magnet (1) is formed by drawing a part of the ferromagnetic rod (2) with a hole (a bulge in the lla direction).

Next, in the direction of the gradient surface of the magnet (11) in the ferromagnetic plate (3), which is removably engaged with the other magnetic pole surface of the magnet (1), the previous hole (1) a is inserted. The bulge part (3)a that reaches the plate (2) or the bulge part (2)a through the plate is integrally bulged.

＼Z) The bulging part (2) of the plate (2) and plate (3) in the stopper
)a, (Press the caulked tube (4) in the shape of a pipe with a bottom into the concave hole of 31a from the opening surface of this caulked tube (4), so that the mouth edge of the tube (4) It was designed to unify the two by rolling up the inside of the silk.

The crimped tube (4) thus installed is attached to a handbag,
Insert the pin into the surface of the article to which clothes, bands, etc. are to be attached, crush the insertion end, or attach this crimped tube (4) to another crimped tube shaped like a funnel or pipe. These caulking members are press-fitted into the member so that they are fixed to the base plate surface.

Therefore, the bulging part (21a,
(31a is a preparative ζ crimped tube (4) whose wall has been made thinner by narrowing down and is press-fitted into one piece, and together they constitute an effective passage for the lines of magnetic force.

Also, for the purpose of providing a magnetic shielding effect, a ferromagnetic plate (6) is attached, or a shoulder (5) C is attached to the case (5).
In addition to providing a case (5) with a simple cylindrical body and holding the plate (6) etc. with the engaging edge flange (5) d, and cases where these couses are completely omitted, other cases are possible. Considerable design changes were planned.

Similarly, when the length of the bulge (3) a is extended to the plate (2), the bulge (2) a on the surface of the plate (2) is omitted, and the bulge (2) a is omitted. ) When a is the length dimension reaching the upper edge of hole (1) a, the bulge part (3) a at plate (3) #
is omitted; instead, a rim tsuba (3)b is bent on the circumferential edge of the plate (3).

The present invention consists of a diagonal upper plate.
By squeezing 1 and simply molding the swollen portions (2) a and 31a, the separate molding of the conventional protrusions is not required, and the insertion, crimping, and other assembly of the protrusions is eliminated. By replacing the complicated process of manufacturing with maids, it was possible to provide products at low cost.

[Brief explanation of the drawing]

Figure m1 is a perspective view of the unexploded 8JJ1 sheet-lined caulked pipe, Figure 2 is a cross-sectional view of the same assembling, and Figures 3 to 9 are cross-sectional views showing each embodiment of the retainer. be. Oka, in the figure +I+...Permanent magnet, (2i, (31...
Ferromagnetic plate, (4)... caulked tube, (5)... Koos, (6)... ferromagnetic plate. Patent Applicant Co., Ltd. Tamo Attorney Patent Attorney Neji Shikuwa Hara Engraving of the drawings (Contents: 1 Figure 1 Reversed 1 v No changes) Figure 4 Figure 6 Prisoner Figure 5 Figure 71; Written amendment to the procedure (Method) % formula % 1 Indication of the case Patent Application No. 128751 of 19822, Title of the invention Part 3, Person making the amendment, Relationship to the case Patent applicant's office
5-46-7 Arakawa, Arakawa-ku, Tokyo Name: Tamo Co., Ltd. Representative Mori 1) Tamao 4, Agent 8, Details of amendment All drawings will be supplemented as per the supplementary drawings attached.

Claims (1)

[Claims] A permanent magnet (1) with a hole (1) a extending in the direction of the magnetic pole surface.
If a ferromagnetic plate (2) is attached to one magnetic pole surface in 1, and a ferromagnetic plate (31) is removably attached to the other magnetic pole surface, the same number plate (gl, (21, (3) is squeezed out from either or both of 31, and the engaging bulge (2) a is abutted through the hole (1) a.
, f3) The bulge (2) in the engagement tool a.
a, f3) An engagement tool characterized in that a bottomed pipe-shaped caulked tube (4) is press-fitted from the open end of the tube (414) from the opening surface of a.