JPS6145363B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) This invention enables the male stop in an engaging tool using a permanent magnet to be pulled out only in the direction perpendicular to the female stop. The present invention relates to the disclosure of an engaging tool structure that reliably prevents peeling of magnetically attached surfaces due to mutual inclination.

(Prior art) Previously, this type of engagement tool was designed to fit the rod of the male stopper while allowing a considerable amount of play in the hole formed in the magnet used. .

(Problems to be Solved by the Invention) In such a method, if a lever action is applied between the male and female fasteners, such as when the female stopper is tilted, the magnetically attached surface may easily peel off, causing the male and female fasteners to separate. If the male stopper mounting base plate is hard, the base plate of the male stopper mounting base plate and the female stopper mounting base plate may cause the stopper to fall off, especially if the male stopper mounting base plate is hard. There were problems such as the magnetic attachment between the male and female fasteners easily peeling off due to mismatching of the printing plates.

(Means for Solving the Problems) The engaging tool according to the present invention has been specially devised in view of the inconveniences in the prior art, and the engaging tool is a male fitting inserted into a hole of a female stop. In order to eliminate any lever-like movement of the rod of the stopper, a ferromagnetic magnet is attached to the magnetic pole surface b of a permanent magnet 1 having a hole 1a extending from one magnetic pole surface a to the other magnetic pole surface b. A ferromagnetic rod 3a protruding from the plate 3 is a ferromagnetic plate 2 attached to the magnetic pole face a of the permanent magnet 1 within the hole 1a of the permanent magnet 1, or a ferromagnetic rod 3a protruding from the ferromagnetic plate 2. In the engagement tool which is detachably attracted to the rod 2a, the permanent magnet 1 and the ferromagnetic plate 2 are housed in a non-magnetic case 5 having an inverted dish shape, with the magnetic pole surface b facing inward, and The engaging tool is configured so that the ferromagnetic rod 3a is tightly fitted into the hole 5c of the non-magnetic case 5, which has a flange 5b extending inwardly of the hole 1a.

(Embodiment) A typical embodiment of the engaging tool according to the present invention will be described below with reference to the attached drawings.
This permanent magnet 1 includes various sintered magnets, in addition to the conventional steel bar magnet.
Rare earth magnets, plastic magnets, etc. are used.

A ferromagnetic plate 2 is attached to the magnetic pole face a of the permanent magnet 1, and a bent leg 4 is attached to the ferromagnetic plate 2.
A female fastener is constructed by attaching a mounting washer 4 having a to 4a, and integrally fixing the permanent magnet 1, ferromagnetic plate 2, and mounting washer 4 with a case 5 made of a non-magnetic material. ing.

Incidentally, the case 5 has an inverted dish shape, and houses the permanent magnet 1 and the ferromagnetic plate 2 with the magnetic pole surface b facing inward.The case 5 has a hole 5c communicating with the hole 1a.
is provided, and the hole edge of the hole 5c is folded inward to form a hole edge collar 5b, and locking claw pieces 5a to 5a are appropriately protruded from the opening edge of the case 5 to form the ferromagnetic plate 2.
The permanent magnet 1 and the ferromagnetic plate 2 are held together by being bent on the surface with a mounting washer 4 interposed therebetween.

Further, the opening of the hole edge flange 5b of the case 5 has a so-called funnel-shaped hole surface whose diameter expands from the inside to the outside, making it particularly easy for the ferromagnetic rod 3a to slide into the hole.
Furthermore, by configuring the lower part of the hole edge flange 5b in a reduced diameter shape to have an inner diameter in which the ferromagnetic rod 3a is tightly fitted, the frictional resistance with the ferromagnetic rod 3a is maximized, and at the same time, the friction between the hole edge flange 5b and the permanent magnet 1 is reduced. A considerable magnetic gap is provided between the hole 1a and the inner circumferential wall surface to prevent magnetic leakage, so as to minimize the possibility of external interference with the magnetic closed circuit constituted by the ferromagnetic rod 3a. I'm starting to get rid of it.

In contrast to such a female stop, the male stop includes a ferromagnetic plate 3, and a ferromagnetic rod 3a having a length extending through the hole 1a of the ferromagnetic plate 2 on the surface of the ferromagnetic plate 3. , and a mounting washer 4 having bent legs 4a to 4a, and a ferromagnetic plate 3.
The ferromagnetic rod 3a is caulked with a small diameter rod portion.

In the embodiment shown in FIG. 2, a ferromagnetic plate 6 for magnetic shielding is attached to the permanent magnet 1, and the magnetic recording of a magnetic recording card or the like that approaches the magnetic pole face b when the permanent magnet 1 is not engaged is prevented from leaking lines of magnetic force. This is to prevent it from being destroyed by.

It should be noted that a funnel-shaped fixture 7a, a screw rod, a nail rod, and other various types of fixtures are used to attach the mounting washer 4 having the bent leg 4a.

Furthermore, double-sided adhesive tape or the like may be used as a fixing means without using the various mounting fittings mentioned above.

(Effect) Since the engaging tool according to the present invention is configured as described above, when the female stopper and the male stopper are engaged, the ferromagnetic rod 3a of the male stopper touches the hole edge flange of the case 5 of the female stopper. Due to the tight fitting with 5b, there is no looseness between the two, and there is no room for the ferromagnetic rod 3a to make lever-like movements, thereby preventing a decrease in the adsorption force due to the lever-like movements and ensuring reliable adsorption engagement. It is something.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a typical embodiment of the engaging tool according to the present invention, and FIG. 2 is a sectional view of another embodiment. 1... Permanent magnet, 2, 3... Ferromagnetic plate, 4...
Mounting washer, 5... Case, 6... Ferromagnetic plate, 7...
...Mounting hardware.

Claims (1)

[Claims] 1. A ferromagnetic rod 3a protrudes from a ferromagnetic plate 3 that is attracted to a magnetic pole surface b of a permanent magnet 1 having a hole 1a extending from one magnetic pole surface a to the other magnetic pole surface b. , an engagement tool that is detachably attracted to a ferromagnetic plate 2 attached to the magnetic pole surface a of the permanent magnet 1 in the hole 1a of the permanent magnet 1 or a ferromagnetic rod 2a protruding from the ferromagnetic plate 2; In the above, the permanent magnet 1 and the ferromagnetic plate 2 are housed in a non-magnetic case 5 having an inverted dish shape, with the magnetic pole surface b facing inward, and a rim flange extending inward of the hole 1a. An engagement tool characterized in that the ferromagnetic rod 3a is tightly fitted into a hole 5c of a non-magnetic case 5 having a hole 5b.