Nylon gripper elements of zippers and threaded rods for...

Plastic article or earthenware shaping or treating: apparatus – Means to form preform from bulk and means to convolute or... – Convoluting means includes an endless surface

Reexamination Certificate

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Details

C425S391000, C425S814000, C425SDIG039

Reexamination Certificate

active

10634675

ABSTRACT:
A nylon zipper has two fastener structures. Each fastener structure has a plurality of nylon gripper elements. Each nylon gripper element has at least one side including a concave portion. A seaming wire for seaming the zipper to a cross strip is embedded in the concave portion. Thereby when pulling a pull head, the seaming wire will not rubber the cross strip. Moreover, a threaded rod device of a nylon zipper comprises two parallel threaded rods. Each threaded rod has threads. One of the threaded rod has a plurality of tips arranged in recesses between each two threads for forming concave portions and convex portions on nylon gripper elements of the fastener structures of the nylon zipper at the same time.

REFERENCES:
patent: 3729800 (1973-05-01), Popovitsch
patent: 4325184 (1982-04-01), Omori
patent: 4501547 (1985-02-01), Mizuhara et al.
patent: 4599065 (1986-07-01), Takahashi
patent: 6302676 (2001-10-01), Kato et al.

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