Buckles – buttons – clasps – etc. – Button with fastener – Button with cavity for friction grip fastener
Reexamination Certificate
2000-04-03
2002-03-12
Sakran, Victor N. (Department: 3626)
Buckles, buttons, clasps, etc.
Button with fastener
Button with cavity for friction grip fastener
C024S090500, C024S114050, C024S662000
Reexamination Certificate
active
06353978
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a snap fastener having a detachment directionality. When the male and female parts of this type of fastener are fitted to their respective cloths, the cloths can be separated from each other from a certain direction but not from other directions. This type of snap fastener has numerous applications including bags, shoes, etc.
BACKGROUND OF THE INVENTION
A prior invention by the applicant of the present invention disclosed in JP-A-10-33210(1998) is a tape-mounted snap fastener comprising a male-side tape consisting of resin male snaps mould-fastened on a cloth tape at certain intervals and a female-side tape consisting of resin female snaps mould-fastened on a cloth tape at the same intervals as the male-side tape.
The male snap has an attachment protrusion sticking out from the center of a male base, said attachment protrusion comprising a neck and an attachment head, wherein said neck is concentric with the male base while said attachment head is eccentric from the axial center of the neck to form an engagement edge.
The female snap has a female base having a head-inserting guide hole for inserting the attachment protrusion, an attachment hole through which the attachment head passes as it elastically changes its form, and a head chamber hole encasing the attachment head, wherein said head-inserting guide hole is concentric with the attachment hole while said head chamber hole is eccentric from the insertion center so as to correspond to the eccentricity of the attachment head of the male snap, and a stopper step is formed at least on the eccentric side of the periphery of the head chamber hole.
The attachment strength of this snap fastener differs depending on the direction in which it is pulled apart.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a snap fastener having larger directional strength against a detaching force than that of the prior invention. More specifically, the snap fastener of the present invention possesses such a powerful directional strength that an ordinary adult cannot pull it apart with his/her fingers unless he or she tries to pull it apart in certain directions.
The snap fastener having a detachment directionality of the present invention comprises a male snap made of synthetic resin and a female snap made of synthetic resin, in which the male snap has an attachment protrusion sticking out from the center of a male base, said attachment protrusion comprising a neck and an attachment head, wherein said neck being concentric with the male base while said attachment head being eccentric from the axial center of the neck to form an engagement edge, and the female snap has a female base having a head-inserting guide hole for inserting the attachment protrusion, an attachment hole through which the attachment head passes as it elastically changes its form, and a head chamber hole encasing the attachment head, said head-inserting guide hole being concentric with the attachment hole while said head chamber hole being eccentric from the insertion center so as to correspond to the eccentricity of the attachment head of the male snap, and a stopper step is formed at least on the eccentric side of the periphery of the head chamber hole, characterized in that a means for minimizing the gap between the male and female snaps is provided.
The means for minimizing the gap between the male and female snaps as they are engaged is preferably a small protrusion established on the side of the neck part opposite the engagement edge of the male snap or a protrusion provided on the female snap. In another construction, the means for minimizing the gap between the male and female snap parts as they are engaged comprises a neck of the male snap having a diameter which is about the same as the diameter of the smallest space of the female snap and a slant part provided on the attachment head of the male snap.
Preferably, the plan view shape of the attachment head is an oval including an ellipse. It is also preferable that a through space that allows the engagement edge to form and the neck to slant is provided at the root of the neck which is on the eccentric side of the attachment head. In yet another preferred embodiment, a positioning means indicating the engagement direction of the male snap and the female snap is provided at a visible position on both the male snap and the female snap.
The present invention also includes a perforating and molding die for perforating and injection-molding a snap fastener having an asymmetrical protrusion that provides the snap fastener with a detachment directionality. This die has a perforating pin which is turnable and is used in a fastened condition at a certain perforating position.
REFERENCES:
patent: 1604913 (1926-10-01), Hattingberg
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patent: 3152376 (1964-10-01), Boser et al.
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patent: 4183121 (1980-01-01), Cousins
patent: 4796339 (1989-01-01), Burke
patent: 5050279 (1991-09-01), Nemazi et al.
patent: 871 732 (1953-03-01), None
patent: 534 508 (1993-03-01), None
patent: 21062 (1911-01-01), None
patent: 10033210 (1998-02-01), None
patent: 83 01182 (1983-04-01), None
patent: 83 01889 (1993-06-01), None
Kawahara Masahiko
Miyoshi Sadao
Bacon & Thomas PLLC
Morito Co., Ltd.
Sakran Victor N.
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