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US 4,238,872 AGranted
Separable slide fastener chain and a method of producing the same
AssigneeYoshida Kogyo K.K.
InventorShunji Akashi
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AssigneeYoshida Kogyo K.K.
InventorShunji Akashi
Estimating the term…
A separable slide fastener chain comprises a pair of oppositely disposed stringers of continuous length each having a support tape and a fastener element formed from a plastic monofilament into a continuous structure secured by sewn seams to a longitudinal inner edge of the respective tape. The fastener element is fused together over a predetermined length of the two coupled stringers at predetermined intervals. A composite pin-forming structure is located centrally of the fused length of the fastener element and cut out to produce a multi-form aperture having a pair of bay portions extending transversely of the fastener chain and oppositely disposed in point-symmetry relation and a pair of elongated canal portions extending longitudinally closely along the sewn seams. The composite structure is subdivisible across the bay portions into two identical pairs of slider-lock pin members and inserting pin members.
A separable slide fastener chain comprising a pair of oppositely disposed stringers of continuous length each having a support tape and a fastener element formed from a plastic monofilament into a continuous structure having coupling head portions and secured by sewn seams to a longitudinal inner edge of the respective tape, said fastener element being fused together over a predetermined length of the two coupled stringers at predetermined intervals, and a composite pin-forming structure located centrally of the fused length of the fastener element and cut out to produce a multi-form aperture having a pair of bay portions extending transversely of the fastener chain and oppositely disposed in point-symmetry relation and a pair of elongated canal portions extending longitudinally closely along the sewn seams, said composite structure being subdivisible across said bay portions into two identical pairs of slider-lock pin members and inserting pin members.
A method of producing a separable slide fastener chain comprising a pair of oppositely disposed stringers of continuous length each having a support tape and a fastener element formed from a plastic monofilament into a continuous structure having coupling head portions and secured by sewn seams to a longitudinal inner edge of the respective tape, which method comprises fusing a predetermined length of said fastener element integrally with said tape edge, shaping a composite pin-forming structure and cutting said structure through a multi-form aperture having a pair of bay portions extending transversely of the fastener chain and oppositely disposed in point-symmetry relation and a pair of elongated canal portions extending longitudinally along the sewn seams and having tapered end portions adapted to transfer the coupling heads from one stringer to the other stringer, said composite structure being subdivisible into two identical pairs of slider-lock pin members and inserting pin members by a line of cut extending transversely across the tapes in registry with said bay portions.
Dependencies are inferred from the claim text.