JPS62155810A - 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 Application Yf) This invention provides a fastener 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. This fastener for a band is improved in that it is weak against the force exerted on one end of the band as a lever as a fulcrum and easily comes off.

(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.
The other end of the band is a ferromagnetic plate 23 with a cylindrical protrusion 24 on the attraction surface 21a.
Attach a male tool made of the above, insert the protrusion 24 into the normal circular hole 25 of the permanent magnet 21, make the ferromagnetic plate 23 stick to the permanent magnet 21, and insert the protrusion 24 in the hole 25 from both sides of the permanent magnet 21. The ferromagnetic plates 22 and 23 are attracted to each other to form a magnetic circuit in which lines of magnetic force are concentrated on the protrusion 24, and both ends of the band are engaged by effective attraction 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 made larger than the outer diameter of the protrusion 24, making it easier to insert the protrusion 24. In addition, magnetic attraction acts like a lever on the attraction surface 21a and is weak against force in the direction of pulling it apart. When a pushing force is applied, the ferromagnetic plate 2
3 is applied with a lever-like force, the lower part of the ferromagnetic plate 23 is pulled away from the attraction surface 21a of the permanent magnet 21, and the protrusion 24 is separated from the ferromagnetic plate 22, so the attraction force is drastically reduced and the engagement between the male and female parts is reduced. The band easily comes off and the band falls off carelessly, so in order to prevent this, the adsorption force must be strengthened, and this requires a larger magnet, which raises the cost. Ta.

(Means for Solving the Problems) The present invention is a stopper for bands provided to solve the above-mentioned problems, in which a hole 1a is formed from one magnetic pole surface a toward the other magnetic pole surface. A female tool A is made up of a plastic permanent magnet l having a ferromagnetic member 2 provided on the magnetic pole face of the permanent magnet 1, and the female tool A is brought into contact with the magnetic pole face a of the permanent magnet l in the female tool A. A male tool B consisting of a ferromagnetic plate 3 and a ferromagnetic protrusion 3a protruding from the ferromagnetic plate 3 is inserted into the ferromagnetic member 2 or the male tool B through the hole 1a of the permanent magnet 1. It is a stop that is detachably attracted to a protruding rod 2a provided on the ferromagnetic member 2, and the hole 1a of the permanent magnet 1 is elongated in a direction perpendicular to the direction in which the band is attached. The short width diameter is at least one diameter d of the protruding rod 3a.
Hole 1 in the band fastening direction so as to be substantially coincident with
By almost eliminating the clearance between the peripheral wall surface of a and the protruding rod 3a, the band is prevented from accidentally falling off.

(Function) That is, if the protruding rod 3a of the male tool B is inserted into the hole 1a of the female tool A in the matching direction and engaged by suction, the short diameter of the hole 1a and one diameter of the protruding rod 3a d are approximately the same, so hole 1a
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. (Here, the diameter refers to the distance between opposing sides sandwiching the center in the case of a rectangle, etc., and the distance between the circumferences opposing the center in the case of a circle, etc.) Therefore, / Even if a force is applied in the direction of separating the male tool B from the suction surface using one end of the suction surface as a fulcrum, the protrusion rod 3a will move in a lever-like manner because the side surface of the protrusion rod 3a is in close contact with the peripheral wall surface of the hole 1a. Therefore, the protruding rod 3a pulls out the male tool B.
does not separate from the suction surface, ensuring engagement of the stopper.

In addition, the engagement between the male AB and the female tool A can be achieved by using the end of the male tool B on the longitudinal side of the hole 1a as a fulcrum and lifting the other end, so that the distance between the protruding rod 3a and the hole 1a is Since there is an extra gap, the suction can be easily removed due to lever-like movement.

(Embodiment) FIGS. 1 to 3 show an embodiment of bags according to the present invention, in which A indicates a female part thereof, B indicates a male part thereof, and the female part A is attached from one magnetic pole surface a to the other. It consists of a plastic permanent magnet 1 having a hole 1a facing the magnetic pole face of the permanent magnet l, and a ferromagnetic member 2 provided on the magnetic pole face of the permanent magnet l.
is a plate-shaped permanent magnet, usually circular, square, oval, etc., made of synthetic resin containing hard magnetic powder, and has a hole 1a approximately in the center, and the hole 1a has a short diameter. It is said to be an elongated hole.

Further, a plate-shaped ferromagnetic member 2 is integrally molded on the permanent magnet 1 on the magnetic pole face, and the ferromagnetic member 2 is formed in the hole 1a.
It has a protruding rod 2a that protrudes inward, and the protruding rod 2a has a narrow diameter portion extending at one end inserted into a hole provided in the ferromagnetic member 2 and is caulked integrally with the ferromagnetic member 2. At the same time, a washer-shaped mounting member 4 having bent fixing leg pieces 4a, 4a is caulked to the back side of the attraction surface to the magnetic pole face of the ferromagnetic member 2, and the fixing leg pieces 4a, 4a are attached. It is designed to be attached to one end of the band by piercing it and bending it.

Further, the male tool B includes a ferromagnetic plate 3 that attracts to the magnetic pole surface a of the permanent magnet l in the female tool A, and a ferromagnetic plate 3 that projects from the ferromagnetic plate 3 and is inserted into the hole 1a of the permanent magnet 1 of the female tool A. ferromagnetic member 2
It consists of a protruding rod 3a that comes into contact with and is attracted to the surface, and the protruding rod 3a is caulked in the same way as the protruding rod 2a in the female tool A, and the mounting member 5 is also made of ferromagnetic material in the same manner as the mounting member 4. It is caulked together with plate 3.

Then, attach the female tool A to the bag body C so that the longitudinal direction of the hole 1a is perpendicular to the opening/closing direction of the lid C°, and attach the protruding rod 3a of the male tool B so that the diameter d of one side is The protruding rod 2a of the female tool A is aligned in the same direction as the short diameter of the hole 1a.
The protruding rod 3a, which is used for adsorption, is usually cylindrical, but may also be square or elliptical.

4 to 8 show other embodiments, in which the protruding rod 2a of the ferromagnetic member 2 of the female tool A is not provided, and the male tool B
The protruding rod 3a is directly attracted and engaged with the plate-shaped ferromagnetic member 2, and a magnetic shield plate 6 made of a ferromagnetic plate is molded on the magnetic pole surface a, so that the magnetic shield plate 6 from the magnetic pole surface a is molded. This is designed to prevent magnetic leakage and prevent adverse effects on magnetic recording articles such as magnetic cards and magnetic tapes that approach the magnetic pole surface a when the male tool B is not attracted.

Further, the mounting member 4 is fixed to the back surface of the attraction surface of the ferromagnetic member 2 by welding or the like.

FIG. 5 shows a mounting member 4 in which one end is a closed end and the other end is a tubular shape with a flanged end, and the flanged end is welded to the back surface of the attraction surface of the ferromagnetic member 2. This is an example of female tool A. In addition, one end of such a tubular mounting member 4 is an open end, or as shown in FIG. In some cases, the hole in the center of the ferromagnetic member 2 is integrally crimped to the back surface of the attracting surface of the ferromagnetic member 2 at the same time as the protruding rod 2a is crimped.

FIG. 7 shows that the ferromagnetic member 2.3 is formed integrally with the protrusions 2a and 3a, respectively, and the plate portions 2b and 3 of one ferromagnetic member 2.3 are integrally formed.
This shows an embodiment in which one end of b is extended laterally to provide a protruding end 2C13C, and the chain portion 2C23C is provided with a hole 7.8 for attaching the band. In FIG. 8, the holes 1a are arranged in two or three stages in the direction in which the band is engaged, with their longitudinal directions parallel to each other, so that the engagement position can be adjusted depending on the tightness of the band.

(Effect) The band stopper according to the present invention is configured as described above,
In particular, since the hole 1a of the permanent magnet 1 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 protruding rod 3a from the longitudinal direction of the hole 1a, and extraction is also possible by separating the female tool A and the male JLB from the longitudinal side ends of the hole 1a.
The ferromagnetic member 2 moves in a lever-like manner in the direction where there is room between the protruding rod 3a and the ferromagnetic member 2, and the protruding rod 3a easily comes out.
The hole 1a has a short width in the direction in which the belt is attached, and the short diameter of the hole 1a and the diameter d of one of the protruding rods 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 rod 3a is in close contact with the peripheral wall surface of the hole 1a, the protruding rod 3a cannot make any lever-like movements and cannot be removed.

Therefore, the band will not come off unless the female and male tools are pulled apart from the longitudinal ends of the hole 1a, and the locked state will be maintained, making it safe and reliable. Also, since only a small magnet is required, the cost will be reduced. Cheap.

The stop itself is also smaller, and the magnet can also be colored.

[Brief explanation of drawings]

：fTJ1 is a perspective view showing an embodiment of the band stopper 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 locked state. longitudinal section,
4 to 7 are sectional views of other embodiments, FIG. 8 is a plan view of another embodiment of the female tool, and FIG. 9 is a sectional view of a conventional example. l... Permanent magnet, 1a... Hole, 2... Ferromagnetic member, 2a... Protrusion rod, 3... Ferromagnetic plate, 3a... Protrusion rod, 4... Mounting member, D...Short width diameter, d...One diameter. No. 5 @ fRq diagram No. 61! ! Figure 8

Claims (1)

[Claims] A female tool A consisting of a plastic permanent magnet 1 having a hole 1a extending from one magnetic pole surface a to the other magnetic pole surface b, and a ferromagnetic member 2 provided on the magnetic pole surface b of the permanent magnet 1; A ferromagnetic plate 3 that comes into contact with the magnetic pole surface a of the permanent magnet 1 in the female tool A, and a ferromagnetic protrusion 3a that projects from the ferromagnetic plate 3
A male tool B consisting of the above is a stop that allows the protruding rod 3a to be removably attracted to the ferromagnetic member 2 or the protruding rod 2a provided on the ferromagnetic member 2 through the hole 1a of the permanent magnet 1. The hole 1a of the permanent magnet 1 is elongated in a direction perpendicular to the direction in which the band is attached, and its short width diameter D substantially matches the diameter d of at least one of the protruding rods 3a. A band stopper featuring: