Where does this come from, and can I check it?

Sliding central runners push hinged ribs outward to tension waterproof canopies. The figure is taken from Encyclopaedia Britannica, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Yes. It sits on the Everyday Life shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

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The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

Folding umbrellas rely on articulated runners and tensioned rib joints

Sliding central runners push hinged ribs outward to tension waterproof canopies

A collapsible umbrella uses a central sliding runner connected to flexible stretchers and hinged ribs that support waterproof canopy fabric. When pushed upward, internal spring catches lock the runner in place while tensioning the steel or fibreglass ribs to hold the dome canopy rigid against wind gusts.

Where this comes from

Encyclopaedia Britannica

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

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Tags: umbrellas, weather, design

Folding umbrellas rely on articulated runners and tensioned rib joints: the short answers

Where does this come from, and can I check it?: Sliding central runners push hinged ribs outward to tension waterproof canopies. The figure is taken from Encyclopaedia Britannica, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a everyday life fact?: Yes. It sits on the Everyday Life shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.