JPS6193606A - Stopper using permanent magnet - Google Patents

Abstract

PURPOSE:To prevent the release of the engaged state, by arranging a sliding member and a preventing tube in a hole, in which a rod is inserted, and around the rod, and applying a force from the side of an attracting surface. CONSTITUTION:A ferromagnetic plate 2 is attracted by a magnetic pole surface (b) of a permanent magnet 1, in which an engaging hole 1a is formed toward another pole surface (b) from one pole surface (a). A sliding member 3 is provided in the hole 1a. Then, an attaching plate 4 is laminated on the mounted ferromagnetic plate 2. The plates are fixed to the permanent magnet 1 as a unitary body by a non-magnetic cover 5 made of brass or the like. An engaging protruded rod 7 is provided on a ferromagnetic plate 6, which is attracted by the permanent magnet 1. A male stopper B is formed by caulking an attaching plate 8 and the ferromagnetic plate 6. A preventing tube 9, which is made of the same raw material as that of the sliding member 3 and has tubular shape and elasticity, is coupled so as to prevent the pull out of the parts.

Description

Detailed Description of the Invention (Industrial Application Field) This invention aims to improve a stop using a permanent magnet, and in particular, to collect the magnetic lines of force of the permanent magnet in the center hole of the permanent magnet in the shape of an annular plate. For fasteners whose suction surface is a ferromagnetic protrusion that is inserted into the hole, a permanent magnet with a weak adsorption force or a small permanent magnet can be used to prevent the protrusion from slipping out. The present invention relates to providing a fastener that can be used.

(Prior art) As a means to effectively draw out the attractive force of a permanent magnet, a configuration is generally used in which the lines of magnetic force of a permanent magnet are concentrated in one place. It has been found that it is effective to collect the lines of magnetic force at the center hole of the annular plate-shaped permanent magnet and to attract them within this hole.

Therefore, the permanent magnet used is an annular plate-shaped permanent magnet, and a ferromagnetic plate is attached to one magnetic pole surface of the annular plate-shaped permanent magnet to form one magnetic field. A stop was created by bringing the protrusion into contact with the ferromagnetic plate forming the magnetic field within the hole of the permanent magnet to form a closed magnetic circuit.

(Problems to be Solved by the Invention) However, even if the lines of magnetic force of the permanent magnet used are effectively drawn out, there is a limit to the attractive force of the permanent magnet, especially when a shock is applied or When a lever-like force is applied to the male and female stops, the adhesion surfaces of the stops separate, and due to the property of permanent magnets, where magnetic force is inversely proportional to the square of the distance, the engagement is unexpectedly easily released. It had

In other words, the attraction force of a permanent magnet is extremely effective in the direction perpendicular to the attraction surface, whereas the holding state is easily released when force is applied from the side of the attraction surface. It had drawbacks.

(Specific Means for Solving the Problems) The fastener according to the present invention was constructed as follows with the intention of eliminating the disadvantages of the prior art. That is, the ferromagnetic plate 2 is attached to the magnetic pole face of the permanent magnet 1 having the hole 1a from one magnetic pole face a to the other magnetic pole face, and the protruding rod of the ferromagnetic plate 6 is attracted to the magnetic pole face a. 7 to the ferromagnetic plate 2 or a ferromagnetic protrusion rod 11 protruding from the ferromagnetic plate 2 within the hole 1a of the permanent magnet l, the protrusion of the stop The rod 7 is a stopper in which a slip-off prevention cylinder 9 having elasticity such as rubber is fitted onto the circumferential surface of the rod 7.

(Embodiment) The details of the present invention will be described below with reference to a typical embodiment shown in the drawings. Reference numeral 1 denotes a permanent magnet in which an engaging hole 1a is opened from one magnetic pole surface a toward the other magnetic pole surface. A ferromagnetic plate 2 is adsorbed and attached to the magnetic pole face of the permanent magnet 1, and a cylindrical plate made of rubber or highly elastic synthetic resin, synthetic leather, foam material, etc. is inserted into the hole 1a as required. A sliding contact member 3 is provided inside, and then a mounting plate 4, which is formed by integrally bending the locking leg pieces 4a to 4a, is laminated and attached to the attached ferromagnetic plate 2, and these mounting plates 4 are attached. , the ferromagnetic plate 2 and the sliding contact member 3 are held together by a permanent magnet l with a brass or other non-magnetic cover 5.
It was made to be fixed integrally to the

The cover 5 has a hole 5a corresponding to the inner diameter of the hole 3a in the sliding contact member 3, and the edge of the hole 5a engages with the edge of the hole 3a in the sliding member 3. It has an inverted dish shape with an edge flange 5b, and appropriate bent locking pieces 5C to 5c are integrally provided along the opening edge of the inverted dish shape.

For the female stopper A having the above-mentioned configuration, a protruding rod 7 for engagement that contacts and attracts the ferromagnetic plate 2 within the hole 1a to the ferromagnetic plate 6 that is attracted to the magnetic pole surface a of the permanent magnet l. , and the protruding rod 7 is caulked to the ferromagnetic plate 6 together with the mounting plate 8 formed by integrally bending the locking leg pieces 8a to 8a to form a male stop B.
was configured.

For such a basic configuration example, a cylindrical and elastic slip-off prevention cylinder 9 made of the same material as the sliding member 3 is fitted on the circumferential side of the rod 7.

In the embodiment shown in FIG. 2, a cylindrical member 10 made of metal or synthetic resin is placed inside the hole 1a of the permanent magnet 1, and this cylindrical member lO and the cylinder 3 of the rod 7 are in contact with each other. I have to.

In the embodiment shown in FIG. 3, the sliding contact member 3 is installed so as to be in close contact with the hole 1a of the permanent magnet 1, and the sliding contact member 3 and the cylinder 3 are in direct contact with each other. There is.

The embodiment shown in FIG. 4 shows an example in which the ferromagnetic plate 2 is also provided with protruding rods 11 corresponding to the protruding rods 7 of the ferromagnetic plate 6, and these rods 7 and 11 are attracted and magnetically A closed circuit was constructed.

(Effects) The present invention has such a characteristic structure, in particular, that the sliding contact member 3 and the prevention cylinder 9 are arranged in the hole 1a into which the rod 7 is inserted and on the circumferential surface of the rod 7, so that the rod 7 that is being attracted This effectively deterred secession.

By the way, in the conventional stopper structure using this type of permanent magnet, the direction in which the engagement is released, that is, the opening and closing of the lid, etc., is not necessarily perpendicular to the suction surface, which is a little difficult. Since the direction is inclined, the suction is easily released.

The present invention has been devised especially in view of the defects of the conventional products, and utilizes the inevitably induced inclination at the time of separation to reduce the distance between the rod 7, the sliding contact member 3, and the prevention tube 9. In order to prevent the pull-out due to the frictional resistance caused in the core part, and to achieve repulsion re-adsorption due to the elastic force of the sliding contact member 3 and the prevention cylinder 9, a stronger adsorption force is achieved. was maintained.

Furthermore, due to such structural features, the rod 7 can be inserted in close contact with the elasticity of the sliding contact member 3 and the prevention tube 9.
Furthermore, it is possible to confirm that the rod 7 has been suctioned to the plate 2 by seeing that it is suddenly suctioned from the fixed pushed-in position and makes a contact sound when the jacket is put on.

By the way, the main purpose of interposing the sliding contact member 3 and the prevention tube 9 is to bring out the above-mentioned stable adsorption properties, thereby making it possible to reduce the cost and size of the magnet used. In other words, the features described above make it possible to use magnets with low magnetic capacity, effectively reducing the proportion of permanent magnets in the material cost, and at the same time making it possible to use thin and small-sized engagements. It also made it possible to provide that.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a typical embodiment of the present invention;
Figures 4 through 4 are sectional views showing other embodiments. In addition, in the figure 1... permanent magnet, 2... ferromagnetic plate, 3...
・Sliding contact member, 4...Mounting plate, 5...Cover, 6...
・Ferromagnetic plate, 7...Protruding rod, 8...Mounting plate, 9...
・Preventing cylinder, lO...Cylinder member, 11...Protruding rod.

Claims (1)

[Claims] A ferromagnetic plate 2 is attached to the magnetic pole face b of a permanent magnet 1 having a hole 1a extending from one magnetic pole face a to the other magnetic pole face b, and the ferromagnetic plate is attracted to the magnetic pole face a. A stop for removably attaching the protruding rod 7 of No. 6 to the ferromagnetic plate 2 or the ferromagnetic protruding rod 11 protruding from the ferromagnetic plate 2 within the hole 1a of the permanent magnet 1, A stop using a permanent magnet, characterized in that a slip-off prevention tube 9 made of elastic material such as rubber is fitted onto the circumferential surface of the protruding rod 7 of the tool.