Buckles – buttons – clasps – etc. – Button with fastener – Separable
Reexamination Certificate
1999-03-25
2001-01-09
Sakran, Victor N. (Department: 3626)
Buckles, buttons, clasps, etc.
Button with fastener
Separable
C024S1130MP, C024S114400
Reexamination Certificate
active
06170129
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a press fastener with a press fastener ball fixed to a first supporting web and a press fastener eyelet, which is firmly connectable to a second supporting web by means of a rivet shank, emanating from a rivet cap and passing through a central perforation.
2. Description of the Related Art
In a prior art press fastener of the present type (DE 39 18 375 A1, EP 0 401 574 A2 ), the press fastener eyelet comprises a plurality of elements, mostly punching sheet elements, mutually connected to form a unit and having a resilient member for holding the press fastener ball, said resilient member catching the ball head from the back. These press fasteners are intricate in structure, correspondingly costly with respect to their manufacture and, moreover, detrimentally allow for a low number of closing and opening cycles only.
According to another prior art embodiment, the press fastener eyelet is in the form of an eyelet pan made of sheet brass, the edge portion thereof bearing a widenable plastic ring in such a way that, when inserting the press fastener ball in the press fastener eyelet, the plastic ring, having been deformed temporarily, catches the press fastener ball from the back. Apart from the polygonal shape of the ring it is also known to insert a circular plastic ring having circumferentially radially projecting cams. Also in these embodiments the relatively complicated metal sheet eyelet pan is of functionally essential importance; besides, the desirable high number of closing and opening cycles cannot be achieved.
SUMMARY OF THE INVENTION
It is the object of the present invention to develop the press fastener of the type mentioned initially above so as to obtain a fastener that is low in price, while being simpler in construction, and that provides a high number of closing and opening cycles.
According to the present invention, this object is achieved essentially in that the press fastener eyelet comprises a substantially annular plastic moulding having said central perforation and which comprises a round ball reception area and a temporarily widenable locking area, tapering towards the insertion end for the press fastener ball and extending roughly coaxially thereto.
This functionally essential moulding can be manufactured by injection moulding of plastic material in an efficient, and thus inexpensive, manner. Besides, it is ensured that the locking area safely allows for very high closing and opening cycles.
BRIEF DESCRIPTION OF THE DRAWINGS
In a particularly advantageous embodiment, the plastic body comprises a ring flange-like outer edge, to which is connected in axially displaced manner the central area having the central perforation, and an all-round groove increasing the resilient action of the locking area is provided in the rang flange-like outer edge of the plastic body radially outside the locking area.
In this construction, the locking area may be of circular shape. According to a particularly advantageous modification, however, it is of polygonal shape, with the locking area having four circumferentially uniformly distributed projections on the radial inside.
As a material for producing the plastic body, polyamide or polyester may be used. However, as it has turned out, there may be achieved particularly high closing and opening cycles in the order of at least 50,000, without a remarkable change in energy to be spent, if the plastic moulding is moulded from POM (polyoxymethylene). Therefore, press fasteners having such a press fastener eyelet are particularly suitable for long-life commodity goods, such as money purses and are mainly used in leather industry.
A particularly attractive outer appearance of high durability may be obtained in spite of the before-mentioned high number of cycles if, on the side of the plastic body facing the insertion end, with the said plastic body is associated a metal cup with an opening only freeing the insertion end. This metal cup may be connected to the plastic body in any way desired. In a particularly advantageous modification, the metal cup is connected to the outer edge of the plastic body by inward beading of its outer edge.
Naturally, the press fastener eyelet, i.e. the plastic body and the metal cup, may be coloured with different colour shades according to requirements. A particularly attractive coloration can be obtained by colouring the metal cup as well as the plastic body with a gold shade.
REFERENCES:
patent: 4197617 (1980-04-01), Appelt
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patent: 5014400 (1991-05-01), Ban
patent: 5115548 (1992-05-01), Nysten
patent: 5435043 (1995-07-01), Ito et al.
patent: 5517730 (1996-05-01), Ho
patent: 1807760 (1970-09-01), None
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patent: 3239445 (1983-10-01), None
patent: 3918375 (1990-12-01), None
patent: 0401574 (1990-12-01), None
patent: 0606591 (1948-08-01), None
A. Raymond, Druckknopf- Und Metallwarenfabrik, “Druckknopf Aus Kunststoff”, No. Prov. 918,486, Dec. 13, 1962.
Kueffner Friedrich
Sakran Victor N.
YKK Europe Ltd.
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