Anti-jam zipper

Anti-jam zipper with wedge-adjustable slider angle

This technology uses a wedge to connect vertically spaced upper and lower sliders, allowing the coupling angle to change based on external force. By setting the gap between the rails wider than the tape thickness, pressing one side narrows that rail while widening the opposite side to prevent jamming.

Standard zippers often jam when fabric or other debris gets caught because the narrow gap between the body sides is designed to prevent teeth misalignment. Forcing the slider to move in these situations frequently results in damaged teeth or a broken zipper body.

With this technology, if debris interferes, the body tilts to naturally release the obstruction. Even if a jam occurs, simply pressing one side of the body clears it. Applicable to clothing, bags, tents, and sleeping bags, this simple, low-cost design reduces user frustration and fabric damage.

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Key Features:

• A body featuring a wedge that connects vertically spaced upper and lower sliders, allowing the coupling angle to change under external force
• A tab with one end secured to the tab holder on the upper slider to move the body along the length of the tape
• A body including a separation port that houses separated teeth with a wedge in between, and a coupling port that houses interlocked teeth
• First and second rails formed with a gap larger than the tape thickness, where compressing one slider narrows the corresponding rail gap while widening the opposite rail gap

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