JPS5854308B2 - magnetic gasket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an assembly structure of an airtight magnetic gasket that is installed in a gap between an opening/closing door of a refrigerator or the like.

Magnetic gaskets, which have a built-in magnet inside the gasket body to apply the magnetic force of the magnet when the door is closed and at the same time maintain sufficient airtightness, are widely used for maintaining airtightness in the gap between refrigerator doors. However, the conventional magnet gas grip of this type is
As shown in the figure, a rubber magnet 1 made of barium ferrite and natural rubber is inserted into a magnet holding part 3 formed in advance on a gasket body 2 made of soft vinyl chloride with good deterioration resistance. Then, the respective inclined cut surfaces formed at both ends are butted and welded to each other to form a corner welded part 5 as shown in Fig. 2, and the corner welded part 5 is assembled and molded into a frame shape and attached to the periphery of the opening/closing door. It is now possible to do so.

However, such a conventionally known magnetic gasket assembly structure has the following drawbacks.

That is, (1) Since the magnet 1 must be inserted into the gasket body 2 manually, the work is troublesome and there is also a problem in mass production.

(2) Since there is a gap A portion in which the magnet 1 is not inserted in the inclined cut surface of the gasket body 2 that is butted against each other to form the corner weld 5, Since a uniform magnetized surface cannot be obtained and the joint strength is weak, deformation and cracks are likely to occur when the door is opened and closed frequently, making it difficult to withstand long-term use.

(3) There is some gap between the thin magnetized wall 4 of the part of the magnet gasket facing the refrigerator body and the magnet 1 inserted into the magnet holding part 3 to facilitate the insertion of the magnet. Because it remains, when the door is opened and closed, the magnet 1 moves in the direction of the magnetized wall 4 and
As the magnetized wall 4 is repeatedly opened and closed in order to deform the magnetized wall 4 by concentrating local stress on it, the magnetized wall 4 often gets fatigued and breaks.

(4) When providing the corner welding part 5 to correspond to the corner part of the door, since the magnet holding part 3, especially the magnetized wall 4, is thin, welding work at the corner part is difficult, and There were cases where the welded portion 5 became higher than other magnetized walls 4a, or the portion 6 near the welded portion 5 was deformed.

(5) Welding flashes inevitably occur in the corner welds 5, but since the magnetized wall 4 is thin, there is a risk of making holes when removing flashes, so the work must be done carefully. It was also quite troublesome.

Therefore, this invention was made to solve the above-mentioned drawbacks of conventionally known magnet gas guts, and consists of a synthetic resin such as a synthetic resin such as soft vinyl chloride resin, which is the same material as the gasket body, and a magnetic material such as barium ferrite. Using a synthetic resin thread magnet formed from It is characterized in that the slanted cut surfaces are butted and welded to each other to form a substantially right-angled corner welded portion, and then assembled and formed into a picture frame shape.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 3 to 5.

FIG. 3 shows the cross-sectional structure of a molded magnetic gasket. Reference numeral 11 is a gasket body made of soft synthetic resin, such as soft vinyl chloride. A cushion part 13 is arranged in series, and a magnet holding part 14 is arranged in series on the upper surface of the cushion part 13.

A soft synthetic resin magnet 15 is welded to the inside of the magnet holding part 14 so that its entire side surface is buried in the magnet holding part 14, and is integrally formed in close contact with the magnet holding part 14 without any gaps.

The soft resin magnet 15 is made of a soft synthetic resin such as soft vinyl chloride, which is the same material as the gasket body 11, and barium ferrite. It is a flexible magnetic material similar to conventional rubber magnets.

The magnet gas grip having the above-mentioned structural features is formed by integral extrusion molding as shown in FIG.

That is, first, material B of the soft resin magnet 15 and material C of the gasket body 11 are prepared, and each of these materials B is prepared.

Each of these materials B is put into a separate extruder and put into E.
, C into a mold G having an extrusion groove F having the same cross section as the magnetic gasket, and extrusion molding at the same time under predetermined molding conditions.

However, since the magnetic gasket obtained in this way is a long molded product, it is cut to a length according to its intended use so as to form an inclined cut surface at both ends. By butting and welding the slanted cut surfaces to each other, a substantially right-angled corner joint is formed, and the assembly structure of the present invention is implemented by assembling and molding into a predetermined picture frame shape.

In the magnetic gasket having such a structure, when the gasket main body 11 is extruded, the soft resin magnet 15 is simultaneously welded and held within the magnet holding portion 14, so that the magnet holding portion 14 and the soft resin magnet 15 are bonded together. It has an integrated configuration.

Therefore, the welding work when forming the corner portion is facilitated, the welding strength of the welded portion 16 is improved, and deformation of the corner portion due to welding can be prevented.

Furthermore, when removing welding burrs from the welded portion 16, no local force is applied, so there is no risk of perforation, and it becomes possible to perform unnecessary deburring work, thereby making it possible to automate deburring work. I can do it.

Due to the above-mentioned advantages, it is possible to easily rationalize the manufacturing process up to forming the magnetic gasket into a picture frame shape, and it is possible to manufacture the magnetic gasket at low cost.

Note that since the soft resin magnet 15 is necessarily located at the corner, there is no gap formed between the end faces at the corner, and therefore a uniform magnetized surface can be formed, and the magnetized surface due to the gap is not formed. No defects such as deformation, dents, or tears will occur.

In addition, the magnet holding part 14 and the soft resin magnet 15
are integrated and there is no gap between them, so when the door is opened and closed, the entire load is not locally concentrated on the magnet holding part 14, but is evenly distributed over the entire magnet holding part 14, so it is not a cushion. By expanding and contracting the portion 13, ideal operation as a gasket can be obtained, and the magnetized wall will never be torn due to fatigue due to opening and closing, and the risk of deformation and damage to the magnetized surface of the magnet holding portion 140 can be eliminated.

The assembly structure of the present invention is not limited to the above-mentioned embodiment, but a magnet gasket having inclined cut surfaces at both ends may be used as a modification shown in FIG. Soft resin magnet 15' on the inner bottom surface
There is no problem with a structure in which the lower surfaces of the two are integrally welded, and this structure also has the same effect as the above embodiment.

The magnetic gasket with this configuration has an extrusion groove I that matches the shape of the mold H1, that is, the gasket body 11', as shown in FIG. The material K of the gasket body 11' is applied to the extrusion groove I using a mold H in which the other end of the magnet extrusion groove J is branched from the extrusion groove ■ and opened on the upper surface. By injecting the material M of the soft resin magnet 15 into the upper opening and extruding it at the same time, the lower surface of the soft resin magnet 15 is welded to the inner surface of the magnet holding part 14' to form an integrated magnet gasket. It is sufficient to form a magnet, cut it so as to form inclined surfaces at both ends, and then assemble and mold the magnet by butting and welding the respective inclined surfaces.

The present invention relates to the assembly structure of a magnetic gasket as detailed above, and its structural features provide the following unique effects.

In other words, (1) The corner welded part has a structure in which not only the gasket bodies but also the core magnets are welded together, so the welding strength is extremely strong, and a uniform magnetized surface can be formed, preventing deformation due to gaps. There are no dents.

(2) Since there is no gap between the core magnet and the magnet holding part of the gasket body, the magnet may move even when the door is about to open or close. Therefore, deformation of the magnet holding part and repeated concentrated loads may occur. It is difficult to break and has extremely good durability.

(3) There is no need to insert the core material magnet into the magnet holding portion one by one, which simplifies the manufacturing process, and allows for mechanical mass production, making it possible to manufacture at low cost.

(4) Even if force is applied to remove the welding burrs, there is no risk of inadvertent perforations in the gasket body, making the work easier and allowing automation of this work.

(5) The risk of deformation and damage to the magnetized surface of the gasket body due to frequent opening and closing of the door can be eliminated.

(6) The cushion portion expands and contracts effectively during use, and the effect of (5) is promoted without concentrating the load on the magnetized surface.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional magnetic gasket, FIG. FIG. 5 is an explanatory diagram showing a manufacturing method thereof, FIG. 6 is a perspective view showing a modification of the present invention, and FIG. 7 is a perspective view of a mold used in manufacturing a magnetic gasket of the modification. 11, 11'... Gasket body, 14,
14'... Magnet holding part, 15, 15'
...Synthetic resin magnet.

Claims (1)

[Claims] 1 A gasket body made of a soft synthetic resin such as soft vinyl chloride, a soft synthetic resin made of the same material as the gasket body, additives, and a magnetic material such as barium ferrite are mixed and molded at a ratio of 10% and 90%, respectively. A core material magnet, which is to be avoided, is formed at each end of each magnetic gasket by extrusion molding so that at least one side of the core material magnet is welded to the magnet holding portion of the gasket body. This is an assembly structure of a magnet gas grip for an opening/closing door, in which a substantially right-angled corner joint is formed by butting and welding the slanted cut surfaces to each other, and then assembled and formed into a frame shape.