Buckles – buttons – clasps – etc. – Having magnetic fastener
Reexamination Certificate
1999-05-18
2001-10-16
Brittain, James R. (Department: 3626)
Buckles, buttons, clasps, etc.
Having magnetic fastener
Reexamination Certificate
active
06301754
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic closure device for items of clothing, leather goods and other fields of application.
It is known that magnetic rubbers, known as plastoferrites, are already commercially available and are substantially constituted by a mixture of rubber or plastics with magnetizable powders such as ferrite or rare earths.
The use of plastoferrites as magnetic closure for items of clothing or leather goods is not feasible because the product, regardless of the matrix material that constitutes the mix, acquires the color of the magnetic powders that it contains and therefore does not have a specific coloring.
Moreover, the magnetic powders, which are integral parts of the material, protrude externally; being metal powders, they are therefore subject to oxidations caused by use, washing and the like, with the possibility of separation of the powders and of rust, which can transfer onto the fabrics to which the closures are applied.
Further, in plastoferrites the magnetic force is constrained by the need to have a well-amalgamated mixture or compound and the higher the amount of metallic powder, the higher the magnetic characteristics, but on the other hand an increase in metal powder significantly reduces the mechanical characteristics of the compound and makes it fragile.
Moreover, plastoferrites are usually calendered in sheets and are then cut to size, without however forming a product which can be easily applied for example to an item of clothing, both because the outer edges of the strips are sharp and because easy stitching is not possible since the magnetic strip is not specifically preset for this.
SUMMARY OF THE INVENTION
The aim of the present invention is to solve the above-mentioned problem by providing a magnetic closure device for items of clothing, leather goods and the like which allows to provide a flexible strip closure which can be connected to the item of clothing, to the leather goods or the like so as to have an external degree of finish which is independent of the quantity and type of magnetizable powder used.
Within the scope of this aim, a particular object of the invention is to provide a magnetic closure device in which it is possible to increase at will the amount of magnetizable powder and therefore the obtainable magnetic force without thereby compromising in any way the mechanical and workability characteristics of the magnetic closure.
Another object of the invention is to provide a magnetic closure device which can be sewn or in any case applied to an item of clothing without encountering particular problems and so as to achieve full isolation of the region that contains magnetic parts from the outside, thus solving the problems produced by wear, rust and potential separation of magnetic particles.
Another object of the present invention is to provide a magnetic closure device which, by virtue of its particular constructive characteristics, is capable of giving the greatest assurances of reliability and safety in use.
This aim, these objects and others which will become apparent hereinafter are achieved by a magnetic closure device for items of clothing, leather goods and the like, according to the invention, characterized in that it comprises at least one layer of magnetizable powders and at least one layer for covering said layer of magnetizable powders, at least the outer face of said covering layer being free from magnetizable powder.
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Patent Abstracts of Japan vol. 096, No. 006, Jun. 28, 1996 & JP 08 038627 A (Meiwa Gravure KK), Feb. 13, 1996 * abstract *.
Grunberger Erico
Marchesi Alberto
Brittain James R.
SAMA S.p.A.
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