Mondo Knows Facts
Door closers slow the swing with oil
A spring shuts the door while hydraulic fluid meters how fast it moves The arm of a closer is linked to a piston inside a chamber filled with oil, and a spring pushes the piston home to shut the door. Oil can only escape through a narrow adjustable orifice, so the door closes at a controlled rate. Two screws usually set the sweep and the final latching speed separately. It sits in Mondo's everyday life collection, one of 200 facts that each trace back to the reference below.
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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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Public doors often open outward for escapeA door swinging with the escape route empties faster than one pulled inwardA door viewer is a fisheye lensA short barrel of lenses shows a whole landing through a small holeA letter plate hinges inward over a hoodThe flap sheds rain while the hood keeps water off the opening itselfStair handrails sit about 900 millimetres above the stepThe height suits a relaxed grip with the arm slightly bent for supportA deadbolt has no spring, unlike a door latchThe latch slides back by spring and bevels to close, but the bolt does notLong door cylinders can be snapped at the middleThe weak point sits where the lock body meets the handle plate
🧭 Everyday Lifefact 145 of 200
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Tags: doors, hydraulics, buildings
Door closers slow the swing with oil: the short answers
- Where does this come from, and can I check it?
- A spring shuts the door while hydraulic fluid meters how fast it moves. 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 2,600 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.