JPS62155809A - Clasp for band - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is directed to a clasp using a permanent magnet used for jewelry bands and bands for wrapping objects, in which the attraction by the permanent magnet is applied to the attraction surface. The present invention relates to a band stopper which is improved in that it is weak against forces acting like a lever with one end as a fulcrum and is easily removed.

(Prior Art) Conventionally, a band stopper using a permanent magnet includes, for example, a permanent magnet 21 having a hole 25 at one end of the band and a ferromagnetic plate 22.
A ferromagnetic plate 2 with a cylindrical protrusion 24 provided on the suction surface 21a is attached to the other end of the band.
3, insert the protrusion 24 into the normal circular hole 25 of the permanent magnet 21 to attract the ferromagnetic plate 23 to the permanent magnet 21, and insert the protrusion 24 into the hole 25 from both sides of the permanent magnet 21. The ferromagnetic plates 22 and 23 are attracted by the protrusion 24 to form a magnetic circuit in which the lines of magnetic force are concentrated on the protrusion 24, thereby locking both ends of the band with effective adsorption force. .

(Problem to be Solved by the Invention) However, in the above-mentioned fastener, the inner diameter of the hole 25 of the permanent magnet 21 is larger than the outer diameter of the protrusion 24 to facilitate insertion of the protrusion 24. Also, magnetic attraction is weak against forces that act like a lever on the attraction surface 21a and pull it apart.

For example, if a force is applied to push the band outward at one end of the attached band, a lever-like force is applied to the ferromagnetic plate 23, and the ferromagnetic plate is 2
3 is pulled apart, and the protrusion 24 separates from the ferromagnetic plate 22, so the attraction force is drastically reduced and the engagement between the male and female parts is easily disengaged.
In order to prevent the band from falling off carelessly, the adsorption force must be increased, which requires a larger magnet, which increases costs.

(Means for Solving the Problems) The present invention is a band stopper provided to solve the above problems, and includes a shallow non-magnetic band stopper with a top wall of 4° and a side wall of 4" and a shallow bottom opening. The case 4 has an elongated hole 4a in the top wall 4°, and a chain hole 4a.
A plate-shaped permanent magnet 1 is housed in a case 4 whose hole edge is bent inward to form a flange 4a', with one magnetic pole surface a of the permanent magnet l facing inside; A female tool A in which a ferromagnetic member 2 is assembled onto the opening of the case 4 so as to be in contact with the other magnetic pole face, and a ferromagnetic plate 3 that is attracted to the top wall 4° of the case 4 in the female tool A. A ferromagnetic protrusion 3a that is inserted into the hole 4a of the case 4 and is brought into contact with and attracted to the ferromagnetic member 2 or the protrusion rod 2a of the ferromagnetic member 2, wherein at least one of the protrusion rods 3a One diameter d
The band consists of a male tool B whose diameter substantially matches the short width of the hole 4a, and a hole 4a of the female tool A is elongated in a direction perpendicular to the direction in which the band is fastened. By almost eliminating the clearance between the circumferential wall surface of the hole 4a and the protruding rod 3a in the engagement direction, the band is prevented from accidentally coming off and falling off.

(Operation) That is, if the protruding rod 3a of the male tool B is inserted into the hole 4a of the female tool A in the matching direction and engaged by suction, the short diameter of the hole 4a and one diameter of the protruding rod 3a d are approximately the same, so hole 4a
There is almost no clearance gap between the protruding rod 3a and the protruding rod 3a in the direction in which the band is engaged. (In the case of a rectangular shape, the diameter refers to the distance between opposing sides across the center, and in the case of a circular shape, it refers to the distance between the opposing sides across the center.) Therefore, the male tool in the direction in which the band is attached. Even if a force is applied in the direction of separating the suction surface from the suction surface using one end of the suction surface of B as a fulcrum, the protrusion rod 3a cannot move like a lever because the side surface of the protrusion rod 3a is in close contact with the collar 4a' of the hole 4a. Therefore, since the protruding rod 3a does not come out and the male tool B does not separate from the suction surface, the retention of the stopper is ensured.

The male tool B and the female tool A can be engaged by lifting the other end using the end of the male tool B on the longitudinal side of the hole 4a as a fulcrum.
Since there is a sufficient gap between the protruding rod 3a and the hole 4a, the suction can be easily removed due to a lever-like movement.

(Embodiment) Figures 1 to 3 show an embodiment of the fastener for bags according to the present invention, in which A indicates the female fitting and B indicates the male fitting. A magnet 1 and a ferromagnetic member 2 are housed, and the case 4 is a shallow non-magnetic case with a bottom opening having a 4° top wall and 4" side walls, and the 4° top wall is usually circular, square, or elliptical. etc.

The top wall 4'' of the case 4 is provided with an elongated hole 4a having a short width diameter of D, and the mouth edge of the hole 4a is bent inward of the case 4 to form a flange 4a'. The lower opening end of the side wall 4'' of the case 4 is provided with bent locking claws 4b at appropriate intervals.Also, the permanent magnet l is inserted into the hole 4a of the case 4 from one magnetic pole surface a to the other magnetic pole surface. Larger elongated hole 1a
It is a plate-shaped magnet having a hole 1a so that the end of the inner peripheral surface is in contact with the collar 4a', and is housed in the case 4 with the magnetic pole surface a inside, and the magnetic pole surface is The attracted ferromagnetic member 2 is attached to the opening of the case 4 by the locking claw 4b.
It is assembled by.

Further, the first ferromagnetic member 2 has a protruding rod 2a that protrudes into the hole la of the permanent magnet l, and the protruding rod 2a is caulked to the center of the plate portion 2b of the ferromagnetic member 2 at a narrow diameter portion at one end thereof. At the same time, a washer-shaped mounting member 5 having bent leg pieces 5a, 5a is caulked to the back surface of the magnetic pole face of the ferromagnetic member 2, and is attached to one end of the band. ing.

Incidentally, the permanent magnets l may be formed into two plate-shaped pieces, and may be arranged on both sides of the hole 4a so as to sandwich it therebetween.

The male AB is a ferromagnetic plate 3 that is attracted to the top wall 4° of the female tool A.
The ferromagnetic member 2 is inserted into the hole 4a of the female JLA.
A ferromagnetic protruding rod 3a that is brought into contact with and attracted to the surface, and bent leg pieces 6a, 6a that are fixed to the back surface of the attraction surface of the first ferromagnetic plate 3.
The protruding rod 3a is integrally caulked by inserting the narrow diameter part of the protruding rod 3a into a hole made in the center of the ferromagnetic plate 3. The length of the protrusion 2a and the length of the protrusion rod 3a are both set to approximately the length of the hole 1a.

Furthermore, the attachment member 6 is also caulked at the same time as the protruding rod 3a is caulked.

Note that the protruding rod 3a is cylindrical, and its diameter d is the same as that of the female tool A.
The protruding rod 3a is formed integrally with the ferromagnetic plate 3 in some cases.

Further, the protruding rod 3a may be a square column, an elliptical column, or the like. Then, the female tool A is attached to one end of the band by piercing and bending the fastening leg pieces 5a, 5a with the longitudinal direction of the hole 4a perpendicular to the band fastening direction, and the male tool B is attached to the band. It is attached to the other end by a mounting member 6, and the protruding rods 2a and 3a are attracted in the hole la, so that the female fitting A and the male AB are engaged.

4 to 8rIIJ show other embodiments, and in the embodiment of FIG. 4, the ferromagnetic member 2 is only a plate portion 2b, and the protruding rod 3a of the ferromagnetic member 3 is attracted. It is dimensioned so that it can be directly attracted to the plate part 2b when engaged, and a ferromagnetic magnetic shield plate 7 is interposed between the magnetic pole face a of the permanent magnet l and the case 4, and from the B1 pole face a This is designed to prevent magnetic leakage of the male tool B, and to prevent an adverse effect on a magnetic recording article such as a magnetic recording card that approaches the magnetic pole surface a when the male tool B is not attracted to the magnetic pole surface a.

Fig. 5 shows a projecting edge 4 by raising the circumferential edge of the case 4 on the side of the magnetic pole surface a.
C, and the ridge 4C prevents the magnetic recording card or tape from coming into close contact with the case 4 on the side of the magnetic pole surface a, thereby preventing the magnetic recording from being destroyed. In the case shown in Fig. 6, the case 4 has a short cylindrical shape, a magnetic shield plate 7 is attached to the magnetic pole face a of the permanent magnet l housed in the case 4, and a bending lock is provided on the case 4. Piece 4
It is locked at point d.

The mounting member 5.6 has a pipe shape with one end closed or open and the other end expanded into a trumpet shape, and the expanded end is connected to the plate portion of the ferromagnetic member 2. 2b by welding or the like, or by caulking a seat plate with the expanded end periphery wrapped around the periphery, it is fixed to the female fitting A and the male fitting B integrally, and one end of the mounting member 5.6 is attached to a band. The hat is pushed into a hole made at one end so that it protrudes from the mounting surface, a washer is inserted into the protruding end, and a crimped or flanged rod cap is press-fitted to fix it.

Incidentally, the attachment member 6 of the male tool B is also the same as that described above.

FIG. 7 shows that the ferromagnetic members 2 and 3 are formed integrally with the protruding rods 2a and 3a, respectively, and one end 2 of the plate portion of the ferromagnetic member 2.3 is
This shows an embodiment in which protruding ends 2c, 3c are provided by extending sideways b and 3b, and band fixing holes 8.9 are provided in the chain portions 2c, 3c.

Furthermore, in the case 4 of the female tool shown in FIG. 8, holes 4a which are elongated in a direction perpendicular to the direction in which the hand is engaged are arranged in parallel in two or three stages in the opening and closing direction. , the engagement position can be changed depending on the tightness of the band.

(Effects) The band tool according to the present invention is constructed as described above, and in particular, the hole 4a of the case 4 in the female tool A is elongated in the direction perpendicular to the direction in which the band is attached. ,
Insertion is extremely easy by inserting the projection 3a from the longitudinal direction of the hole 4a, and removal is also possible by inserting the female tool A and the male tool B into the hole 4.
If you pull apart by holding the longitudinal side ends of a, hole 4 will open.
It makes a lever-like movement in the direction where there is a margin between it and the ferromagnetic member 2, and the protrusion field 3a comes out easily.
The hole 4a has a short width in the direction in which the band is attached, and the short width diameter of the hole 4a and one diameter d of the protrusion field 3a are approximately the same, so even if one end of the band is lifted, the protrusion of the male tool B will not be removed. Since the side surface of the field 3a is in close contact with the flange 4a' of the hole 4a, the projection field 3a cannot move like a lever and is not pulled out.

Therefore, the band will not come off unless you lift its side ends, and the locked state will be maintained, making it safe and secure.
The cost is low because a small magnet is required, and the stopper itself is also small.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the band fastener according to the present invention attached to the band, FIG. 2 is a cross-sectional view of the same in the engaged state, and FIG. 3 is the same in the engaged state. 4 to 7 are sectional views of another embodiment, FIG. 8 is a working view of a female tool of another embodiment, and FIG. 9 is a sectional view of a conventional example. l...Permanent magnet, 2...Ferromagnetic member, 2a...Protrusion field, 3...Ferromagnetic plate, 3a...Protrusion field, 4...
Case, 4°...Top wall, 4"...Side wall, 4a...
Hole, D...short width diameter, d...one diameter. Figure 5 σ Figure q Figure 6 Figure 8 / : 4゜

Claims (1)

[Scope of Claims] A non-magnetic case 4 having a shallow opening at the bottom and having a top wall 4' and a side wall 4'', the top wall 4' of the case 4 having an elongated hole 4a, and a side wall 4''. A plate-shaped permanent magnet 1 is housed in a case 4 in which the edge of the hole 4a is bent inward to form a flange 4a', with one magnetic pole surface a of the permanent magnet 1 inside. and a female tool A in which the ferromagnetic member 2 is assembled on the opening of the case 4 so as to be in contact with the other magnetic pole surface b, and a ferromagnetic plate in the female tool A that is attracted to the top wall 4' of the case 4. 3, a ferromagnetic protrusion 3a is inserted through the hole 4a of the case 4, and is brought into contact with and attracted to the ferromagnetic member 2 or the protrusion 2a of the ferromagnetic member 2, the protrusion of the ferromagnetic member 3 being The male part B has at least one diameter d substantially matching the short width diameter D of the hole 4a, and the hole 4a of the female part A is elongated in a direction perpendicular to the direction in which the band is attached. A band stopper characterized by: