JPH07335428A - Magnetic attraction tool - Google Patents

Abstract

PURPOSE:To acquire intensively magnetic attraction force by a method wherein engaged side ends of the first and second ferromagnetic buttons are gradually recessed from the outer periphery to the central part. CONSTITUTION:Within a magnetic attraction tool 1 wherein a ferromagnetic button 7 protrudes from the front central part of a ferromagnetic board 6, an engagement tool 2 fixed with a fitting piece 5a secured on the back surface as well as another ferromagnetic button 15 protrudes from the front central part of another ferromagnetic board 11, a ring-shaped permanent magnet 12 having a recess is provided around this ferromagnetic board 15. Furthermore, another engagement tool 3 fixed with another fitting leg piece 10a secured on the back surface of the ferromagnetic board 11 are provided so that the ferromagnetic buttons 7 and 15 may be detachably joined in the recessed hole of the permanent magnet 12 while the respective abutting ends of the ferromagnetic boards 7 and 15 are respectively gradually recessed from the other outer periphery to the central part. Through these procedures, the outer peripheries of the engaged side ends to be the corners generating the maximum magnetism abut against each other thereby enabling both engagement holes 2, 3 to be attracted forcibly without fail.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic attracting and engaging device for holding a mouth of a handbag or the like with a lid by utilizing the attracting force of a permanent magnet. The present invention relates to the structure of a magnetic attraction engagement tool in which the magnetic attraction force is increased with the density being the best magnetic flux distribution mode.

[0002]

2. Description of the Related Art FIG. 6 is a side sectional view of a conventional magnetic attraction engaging member, and as shown in FIG.
It is composed of the engagement tool 32 and the second engagement tool 33. The first engagement tool 32 is a washer 35 having attachment leg pieces 35a, 35a for attaching to a mouth portion of a handbag or the like.
And a flat and circular ferromagnetic plate 36 made of a ferromagnetic material such as iron, cobalt, nickel, or an alloy of these, and a small-diameter base end portion which is inserted into the washer 35 and the ferromagnetic plate 36 and caulked to have a large diameter. Is formed by a ferromagnetic button 37 projecting on the side of the ferromagnetic plate 36, and the second engaging member 33 is a mounting leg piece 40 for attaching to the mouth of a handbag or the like.
a washer 40 having a and 40a, a flat and circular ferromagnetic plate 41, a circular ring-shaped permanent magnet 42, a case 43 covering the ferromagnetic plate 41 and the permanent magnet 42, and a small-diameter base end portion. Insert washer 40 and ferromagnetic plate 41 and crimp
A large-diameter attracting portion is formed by a ferromagnetic button 45 protruding from the ferromagnetic plate 41 side while being provided in the hollow hole of the circular ring-shaped permanent magnet 42.

Then, as shown in FIGS. 6 and 7, the first engaging member 32 and the second engaging member 33 are engaged with each other, and the tips of the ferromagnetic button 37 and the ferromagnetic button 45 are brought into contact with each other. Then, the magnetic lines of force of the magnetic pole surfaces 42a and 42b of the permanent magnet 42 are taken into the ferromagnetic plates 36 and 41, respectively, and after forming a magnetic field,
The magnetic attraction force is generated at the contact ends of the ferromagnetic buttons 37 and 45, and the magnetic attraction force of the ferromagnetic buttons 37 and 45 is used as the engagement force of the magnetic attraction engagement tool 31.

[0004]

By the way, in the magnetic attraction engaging device as described above, as shown in FIG. 7, the button head portion 37a, whose diameter is gradually reduced toward the contact ends of the ferromagnetic buttons 37, 45, is provided.
However, since the button heads 37a and 45a are in contact with each other at their central portions and are not in contact with their peripheral portions, there is a problem in that the contact area is small and therefore the magnetic attraction force is small.

Therefore, according to the present invention, there is provided a magnetic attraction engagement tool which is constructed so that the outer peripheral portion of the contact surface of a ferromagnetic button, which is a constituent member of the magnetic attraction engagement tool, comes into contact with the ferromagnetic button. It is intended to be provided.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, in which a first ferromagnetic button is provided at the center of the front surface of a first ferromagnetic plate and a back surface of the first ferromagnetic plate is provided. A first engaging member having fixed mounting leg pieces, a second ferromagnetic button projecting from the center of the front surface of the second ferromagnetic plate, and a hollow hole around the second ferromagnetic button. A ring-shaped permanent magnet having a ring-shaped permanent magnet, and a second engaging member having a mounting leg piece fixed to the back surface of the second ferromagnetic plate. The first engaging member is provided in the hollow hole of the permanent magnet. Of the first ferromagnetic button and the second ferromagnetic button in a magnetic attraction engagement device in which the ferromagnetic button and the second ferromagnetic button are releasably abutted against each other. The magnetic attraction engagement tool has a shape in which the end face on the contact side is gradually recessed from the outer circumference toward the center. Further, the end surfaces of the first ferromagnetic button and the second ferromagnetic button on the suction contact side may be formed in a shape in which the outer peripheral portions are projected.

[0007]

According to the above structure, when the first ferromagnetic button of the first engaging member and the second ferromagnetic button of the second engaging member are brought into contact with each other in the hollow hole of the permanent magnet, The magnetic lines of force on both magnetic pole surfaces are taken into the first and second ferromagnetic plates to form a magnetic field, and then collected by the first and second ferromagnetic buttons to generate a strong attracting force on their contact surfaces. At that time, the end faces of the first ferromagnetic button and the second ferromagnetic button on the suction contact side are gradually recessed from the outer circumference toward the center, and are the corners of the magnet that generates the maximum magnetic force. The outer periphery of the end surface on the suction contact side is in contact, and the contact area is large, so that a stronger magnetic force, that is, a stronger magnetic attraction force is generated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the magnetic attraction engagement device according to the present invention will be described below with reference to the drawings. 1 is a side sectional view of a magnetic attraction engagement tool according to the present invention, FIG. 2 is a perspective view thereof, and as shown in FIGS. 1 and 2, the magnetic attraction engagement tool 1 is a first engagement tool. 2 and the second engagement tool 3. The first engaging member 2 is a washer 5, a ferromagnetic plate 6 made of a ferromagnetic material such as iron, cobalt, nickel, or an alloy of these, which is flat and circular and has a hole at the center thereof. It is formed of a ferromagnetic button 7 made of a magnetic material. The washer 5 comprises leg pieces 5a, 5a for attaching the first engaging member 2 to one of the mouth portions of a handbag or the like, and a plate 5b, and the ferromagnetic button 7 is circular in plan view and has a small diameter. It has an end portion 7a and a suction portion 7b having a diameter larger than that of the base end portion 7a. Then, the small-diameter base end portion 7a of the ferromagnetic button 7 is inserted through the ferromagnetic plate 6 into the hole formed in the center of the washer plate 5b, and the inserted small-diameter base end portion 7 is inserted.
The washer 5 and the ferromagnetic plate 6 are integrated by crimping a, and the ferromagnetic button 7 is attached in a state where the adsorption portion 7b of the ferromagnetic button 7 projects toward the ferromagnetic plate 6 side.

The second engaging member 3 is a washer 10, a flat and circular ferromagnetic plate 11 having a hole formed in the center, a circular ring-shaped permanent magnet 12, and a case 13. And a ferromagnetic button 15. The washer 10 includes leg pieces 10a, 10a for attaching the second engagement tool 3 to the other mouth of a handbag or the like, and a plate 10.
The ferromagnetic button 15 has a circular shape in plan view, and has a small-diameter base end portion 15a and an adsorption portion 15 having a larger diameter than the base end portion 15a.
b. And the washer plate 10b
The small-diameter base end portion 15a of the ferromagnetic button 15 is inserted into the hole formed in the center of the via the ferromagnetic plate 11, and the inserted small-diameter base end portion 15a is caulked to form the washer 10 and The ferromagnetic plate 11 is integrated, and the attraction portion 1 of the ferromagnetic button 15 is integrated.
The ferromagnetic button 15 is attached in a state in which 5b projects toward the ferromagnetic plate 11.

A circular ring-shaped permanent magnet 12 having an outer diameter substantially equal to that of the ferromagnetic plate 11 is placed on the ferromagnetic plate 11, and a ferromagnetic button 15 is placed in a hollow hole of the permanent magnet 12. The large-diameter attraction portion 15b is loosely fitted, and the upper surface of the permanent magnet 12 is formed so as to protrude from the upper surface of the attraction portion 15b of the ferromagnetic button 15. Then, the permanent magnet 12 and the ferromagnetic plate 11 are housed in the case 13, and the locking piece 13a provided around the opening edge on the inner diameter side of the case 13 is bent to the permanent magnet 12 side, and The permanent magnets 12 and the ferromagnetic plate 11 are integrally held by bending the locking pieces 13b, 13b, ... Protrudingly provided on the opening edge on the outer diameter side toward the ferromagnetic plate 11 side.

FIG. 3 is a side sectional view of the ferromagnetic buttons 7 and 15 constituting the first engaging member 2 and the second engaging member 3. As shown in FIG. The peripheral edges of the tips of the suction portions 7b and 15b of the buttons 7 and 15 have acute angles and are gradually recessed from the tip outer peripheral portions 7c and 15c toward the center.

Since the present invention is constructed as described above,
When the first engaging member 2 and the second engaging member 3 are engaged and the attracting portion 7b of the ferromagnetic button 7 and the attracting portion 15b of the ferromagnetic button 15 are brought into contact with each other, the magnetic pole surface of the permanent magnet 12 is formed. 12a and 12b
The magnetic lines of force (see FIG. 1) are taken into the ferromagnetic plates 6 and 11 to form a magnetic field and then collected to the ferromagnetic buttons 7 and 15,
A strong suction force is generated on the tips of the suction portions 7b and 15b and the tip outer peripheral portions 7c and 15c which are the contact surfaces. At this time, the attracting portions 7b and 15b that are the corners of the magnet that generates the maximum magnetic force.
Since the outer peripheral portions 7c and 15c of the tip end contact each other, a stronger magnetic force, that is, a stronger magnetic attraction force is generated as compared with the contact between the center parts, and the first engaging member 2 and the second engaging member 3 Strong and reliable adsorption.

Next, as shown in FIG.
An example will be described. Ferromagnetic buttons 17 and 18 are used instead of the ferromagnetic buttons 7 and 15, and the ferromagnetic buttons 17 and 1
Reference numeral 8 is a circular shape in a plan view, and has small-diameter base end portions 17a and 18a and adsorption portions 17b and 18 having a larger diameter than the base end portions 17a and 18a.
b, and the tip outer peripheral portion 1 of the suction portions 17b, 18b
7c and 18c have a projecting shape, and the other configurations are similar to those of the first embodiment. As a result, the attracting portions 17b and 18 that are the corners of the magnet that generates the maximum magnetic force.
Since the outer peripheral end portions 17c and 18c of the tip b contact each other, the contact area is large, and a stronger magnetic force, that is, a stronger magnetic attraction force is generated, and the first engagement tool 2 and the second engagement tool 3 attract strongly and reliably. To be done.

Next, an embodiment of the apparatus for manufacturing the ferromagnetic button of the magnetic attraction engagement device according to the present invention will be described with reference to FIG. FIG. 5 is a processing step diagram of the apparatus for manufacturing a ferromagnetic button for a magnetic attraction engagement tool according to the present invention. As shown in FIG. 5, the apparatus 21 for manufacturing a ferromagnetic button for a magnetic attraction engagement tool holds a material 22. The holder 23 has a hole 23a through which the material 22 is inserted. The holding bar 25 for restricting the insertion position of the material 22 and for removing the material 22 is provided in the hole 23a. Are provided so that they can move forward and backward.
Further, a mold 26 is arranged at a position facing the holder 23, and the mold 26 is provided with a first mold 27 and a second mold 28 below it. The first mold 27 has a right circular truncated cone shape, and the second mold 28 has a columnar shape corresponding to the attracting portions 7b and 15b of the ferromagnetic buttons 7 and 15.

Next, the process of processing the ferromagnetic button will be described. First, as shown in FIG. 5A, the material 22 is placed in the holder 23.
Insert it into the hole 23a of the
And the material 22 is held by the holder 23.
Then, as shown in FIG. 5B, a mold actuator (not shown) is actuated to advance the mold 26 to the holder 23, and the material 22 is pressed by the first mold frame 27.
A portion of the material 22 protruding from the holder 23 is formed into a dango shape, and as shown in FIG. 5C, the die actuator is operated to retract the die 26 with respect to the holder 23.

Next, as shown in FIG. 5D, the die actuator is operated to raise the die 26, and
The mold 28 is moved to a position facing the holder 23. Then, as shown in FIG. 5 (e), the die actuator is operated to advance the die 26 to the holder 23, and the material 22 is pressed by the second frame 28, so that the holder 23 of the material 22 is held. The more protruding dango-shaped portion is formed into a cylindrical shape. Then, as shown in FIG. 5 (f), the die actuator is operated to retract the die 26 with respect to the holder 23, and the presser bar actuator (not shown) is operated to move the tip of the presser bar 25. The ferromagnetic button that has been molded is removed from the holder 23 by advancing from the tip of the holder 23.

Therefore, while holding the material in the holder,
Since two molds that are built side by side and are molded continuously, it is not necessary to attach and detach the same material to different holders or replace the molds each time the molding process is performed. With this, it is possible to perform smooth forming processing, and improve the processing efficiency.

[0018]

As described above, according to the present invention,
The end surfaces of the first ferromagnetic button and the second ferromagnetic button on the suction contact side are gradually recessed from the outer periphery toward the center, and the suction contact becomes the corner of the magnet that generates the maximum magnetic force. Since the outer periphery of the side end surface abuts, a stronger magnetic force, that is, a stronger magnetic attraction force is generated, and the first engagement tool and the second engagement tool can be strongly and reliably attracted.

Further, since the protruding outer peripheral portions of the adsorbing portions of the first ferromagnetic button and the second ferromagnetic button come into contact with each other, the contact area is large and a stronger magnetic force, that is, a stronger magnetic attracting force is generated, The first engagement tool and the second engagement tool can be strongly and surely adsorbed.

[Brief description of drawings]

FIG. 1 is a side sectional view of a magnetic attraction engagement tool according to the present invention.

FIG. 2 is a perspective view of a magnetic attraction engagement tool according to the present invention.

FIG. 3 is a side sectional view of a ferromagnetic button of the magnetic attraction engagement tool according to the present invention.

FIG. 4 is a side sectional view of a ferromagnetic button showing a second embodiment of the magnetic attraction engagement tool according to the present invention.

5 (a) to 5 (f) are process diagrams of a manufacturing apparatus for a ferromagnetic button of a magnetic attraction engagement tool according to the present invention.

FIG. 6 is a side sectional view of a conventional magnetic attraction engagement tool.

FIG. 7 is a perspective view of a ferromagnetic button portion of a conventional magnetic attraction engagement tool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic attraction engaging tool 2 1st engaging tool 3 2nd engaging tool 5 Washer 5a Attachment leg piece 5b Plate of washer 6 Ferromagnetic plate 7 Ferromagnetic button 7a Ferromagnetic button base end 7b Ferromagnetic button Adsorption part 7c Peripheral part of tip of adsorption part of ferromagnetic button 10 Washer 10a Mounting leg piece 10b Plate of washer 11 Ferromagnetic plate 12 Permanent magnets 12a, 12b Magnetic pole face 13 Case 15 Ferromagnetic button 15a Proximal end of ferromagnetic button 15b Ferromagnetic Button Adsorption Part 15c Ferromagnetic Button Adsorption Part Tip Outer Part 17 Ferromagnetic Button 17a Ferromagnetic Button Base End 17b Ferromagnetic Button Adsorption Part 17c Ferromagnetic Button Adsorption Part Tip Outer Part 18 Strong Magnetic Button 18a Ferromagnetic Button Base End 18b Ferromagnetic Button Adsorption Part 18c Ferromagnetic Button Adsorption Part Tip Outer Part

Claims (2)

[Claims] 1. A first engaging member having a first ferromagnetic button projecting from a central portion of a front surface of a first ferromagnetic plate and a mounting leg piece fixed to a rear surface thereof, and a second ferromagnetic member. A second ferromagnetic button is projected in the center of the front surface of the plate, and a ring-shaped permanent magnet having a hollow hole is provided around the second ferromagnetic button. A second engaging member having mounting leg pieces fixedly mounted on its back surface, and the first ferromagnetic button and the second ferromagnetic button are releasably abutted against each other in the hollow hole of the permanent magnet. In the magnetic attraction engagement tool, the end faces of the first ferromagnetic button and the second ferromagnetic button on the attraction contact side are gradually recessed from the outer circumference toward the center. A characteristic magnetic attraction engagement tool. 2. The magnetic device according to claim 1, wherein the end faces of the first ferromagnetic button and the second ferromagnetic button on the suction contact side have a shape in which the outer peripheral portion is projected. Adsorption engagement tool.