JPS6313336Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a hanging tool using a permanent magnet.
The purpose is to have a thin shape and to make the attractive force of the permanent magnet appear locally.

Hitherto, various types of latches using permanent magnets have been known, and in particular, a ring-shaped permanent magnet is used, and a ferromagnetic material placed on both magnetic pole faces is inserted into the center hole of the ring-shaped permanent magnet. Those in which the parts were able to come into contact with each other in a detachable manner were able to exert a strong attraction force due to the concentration of magnetism. However, in the hanging device using the annular permanent magnet, the fixed side is made up of the annular permanent magnet and one ferromagnetic material, the movable side is made up of the other ferromagnetic material, and both ferromagnetic materials are made of the annular permanent magnet. When they come into contact within the center hole of the magnet, the end face of the annular permanent magnet that attracts the ferromagnetic material on the movable side exhibits a magnetic attraction force over the entire surface, so the strong magnetic material that makes up the movable side As a result of the magnetic body being attracted even if it is not in the correct attraction position, there were problems such as scratches caused by sliding on the magnet cover provided on the end face on the attraction side.

In addition, before the movable side is attracted to the suction end surface of the fixed side, the structure is such that lines of magnetic force exit from the end surface, so magnetic stripes on cash cards, magnetic recording surfaces on the backs of commuter passes, etc. There was a problem in that the recorded contents of the magnetic recording medium were disturbed by the external leakage lines of magnetic force.

However, in this invention, a permanent magnet plate is placed horizontally in a case constituting the fixed side, and a ferromagnetic plate is brought into contact with the upper and lower magnetic pole surfaces of the permanent magnet plate. The magnetic attraction surface made up of a ferromagnetic plate is exposed, while the movable side is provided with a ferromagnetic material that can be moved into and out of contact with the magnetic attraction surface to form a latching tool using a permanent magnet. The ferromagnetic material on the side is not attracted until it directly faces the magnetic attraction surface facing the opening of the case, which solves problems such as scratches on the cap and other parts installed around the opening. It is. Furthermore, the influence on the magnetic recording medium was successfully solved by concentrating the lines of magnetic force on the magnetic attraction surface before the movable side is attracted, and preventing them from leaking to the outside of the hook. Furthermore, by placing the permanent magnet plate horizontally within the case, they succeeded in making the fixed side relatively thermally thin.

That is, to explain this invention with reference to the embodiment shown in FIGS. 1 and 2, a semicircular permanent magnet plate 2 is placed horizontally in a bottomed cylindrical case 1 constituting the fixed side A. A ferromagnetic plate 3a having a semicircular shape and slightly larger than the permanent magnet plate 2 is brought into contact with the upper magnetic pole surface of the permanent magnet plate 2, and a ferromagnetic plate 3a having the same shape as the bottom plate of the case 1 is placed on the lower magnetic pole surface of the permanent magnet plate 2. A disk-shaped ferromagnetic plate 3b is brought into contact. An annular collar 4 is formed on the outer side of the upper opening edge of the case 1, and fixing pieces 5, 5 are connected to the annular collar 4 at diametrically symmetrical positions. Further, on one side of the opening of the case 1, one side of the ferromagnetic plate 3a and the cylindrical ferromagnetic body 6 installed upright on one side of the ferromagnetic plate 3b are faced flush against the movable side B. It has a magnetic attraction surface. A cylinder 7a and a cap 7, which is an annular guide collar 7b connected to the upper end of the cylinder 7a, are provided on the magnetic attraction surface, and the ferromagnetic material on the movable side B passes through the cylinder 7a to the magnetic attraction surface. It is designed to be able to be inserted and removed. In addition, the above case 1
The cap 7 is made of brass or other non-magnetic plate. On the other hand, the movable side B with respect to the fixed side A has a force that penetrates the cylindrical body 7a and reaches the magnetic attraction surface at the center of the lower surface of the disk 8, which has a lower surface shaped to match the annular guide flange 7b of the cap 7. It is constructed by providing a cylinder 9 made of magnetic material. In the figure, 10 is a fixed piece provided on the movable side B.

The hanging tool of the above embodiment is fixed, for example, to the main body 11 side of the bag on the fixed side A, and to the lid 12 side of the bag on the movable side B via fixing pieces 5, 10 and an auxiliary disk (not shown), respectively. and use it. When closing the lid 12, if the cylinder 9 forming the movable side B is inserted through the cylindrical body 7a of the cap 7 to the opening of the case 1 and the cylinder 9 comes into contact with the magnetic attraction surface, a permanent magnet will be generated. As a result of the magnetic path for the magnetic flux of the plate 2 being completed by the cylinder 9, the ferromagnetic bodies 3a and 3b, and the cylindrical ferromagnetic body 6, the cylinder 9 is strongly attracted and the lid 12 can be reliably closed. In this case, since the ferromagnetic body 6 forming the magnetic attraction surface is cylindrical, its cross-sectional area can be ensured and saturation of the magnetic flux can be prevented. Therefore, the magnetic flux emitted from the permanent magnet plate 2 can be focused on the magnetic attraction surface without leaking, and a strong attraction force can be obtained. When opening the lid 12, the contact between the cylinder 9, the ferromagnetic plate 3a, and the ferromagnetic body 6 may be separated by an external force that overcomes the force that attracts the cylinder 9.

In the above embodiment, it should be noted that the attraction force by the permanent magnet plate 2 on the fixed side A is
It is localized only to the opening of the Therefore, when the cylinder 9 comes into contact with the annular guide flange 7b of the cap 7 when the lid 12 is closed,
Since almost no magnetism is applied to this part, the attraction force of the permanent magnet plate 2 does not act on the cylinder 9. As a result, the cap 7 can slide smoothly on the surface of the annular guide flange 7b, and the cylinder 9 can slide smoothly on the surface of the annular guide flange 7b. There is no damage caused by sliding contact. The cylinder 9 is guided by the annular guide collar 7b of the cap 7 and can be easily moved to the position of the cylindrical body 7a of the cap 7.

Moreover, by the cylindrical body 7a that constitutes the cap 7,
Since the suction part is not exposed directly to the outside,
Magnetism leaking to the outside of the cap 7 can be reduced. Therefore, even if a cash card or other magnetic recording information medium comes close to the surface of the cap 7,
It is possible to avoid the influence of the permanent magnet plate 2.

Furthermore, since the permanent magnet plate 2 is placed horizontally within the case 1, the fixed side can be made thinner, making it easier to use when used in handbags and other bags.

That is, according to this invention, the attraction force of the permanent magnet is concentrated at the opening of the case 1 constituting the fixed side, so that the ferromagnetic material on the movable side is attracted to the cap and other members provided at the opening of the case. It has the effect of preventing scratches from sliding, and when the movable side is attracted to the fixed side, the two sides are definitely facing each other, so when used on bags or other bags, the lid can be attached correctly and It has the effect of reliably closing the door.

Furthermore, since the fixed side is constructed by placing the permanent magnet plate horizontally within the case, there is an effect that the fixed side can be made thin. Furthermore, since the magnetic attraction surface is composed of a ferromagnetic plate that is in contact with the upper magnetic pole surface of the permanent magnet plate, and a cylindrical ferromagnetic body that is erected from the ferromagnetic plate that is in contact with the lower magnetic pole surface, magnetic attraction is achieved. As a result of concentrating the entire magnetic flux of the permanent magnet plate on the surface without leaking, it has the effect of obtaining a strong attraction force despite its thin shape.

A cap consisting of a cylindrical body and a funnel-shaped annular guide flange is provided on the outside of the magnetic attraction surface, which prevents magnetic information recording media such as cash cards from coming into direct contact with the magnetic attraction surface. This, combined with the fact that the magnetic flux is concentrated near the magnetic attraction surface, has the effect of eliminating the risk of destroying cash cards and other media. Further, the funnel-shaped annular guide collar guides the ferromagnetic material on the movable side to a position directly facing the cylinder without attracting it, so that the suction operation on the movable side can be performed simply and quickly.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view (taken along the line C--C in FIG. 2) of an embodiment of this invention, and FIG. 2 is a longitudinal cross-sectional view of the same. 1...Case, 2...Permanent magnet plate, 3a, 3b
...Ferromagnetic plate, 6...Ferromagnetic material, 7...Cap, 7a...Cylinder, 7b...Annular guide collar, 8...
Disc, 9...Cylinder.

Claims (1)

[Scope of utility model claims] In a hanging tool that uses the attraction force of a permanent magnet,
A permanent magnet plate is placed horizontally in a case constituting the fixed side, and a ferromagnetic plate is in contact with the upper and lower magnetic pole surfaces of the permanent magnet plate, and an upper ferromagnetic plate is placed on the outside of the permanent magnet plate, A cylindrical ferromagnetic body erected on the lower ferromagnetic plate constitutes a magnetic attraction surface, and the magnetic attraction surface faces the upper opening of the case,
The movable side is provided with a ferromagnetic material that can be moved into and out of contact with the magnetic attraction surface, and the upper opening of the case is provided with a cap for guiding the ferromagnetic material on the movable side to the outside. The cap is a hanging device that uses a permanent magnet and is characterized by consisting of a cylindrical body and a funnel-shaped annular guide collar connected to the top of the cylindrical body.