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2. Door closer - Wikipedia

   en.wikipedia.org/wiki/Door_closer

   A door closer is a mechanical device that regulates the speed and action of a door’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior. Door closers can be linked to a building's fire and security alarm systems. [2]

3. Toggle - Wikipedia

   en.wikipedia.org/wiki/Toggle

   Toggle mechanism; Toggle switch; Toggling harpoon, an ancient weapon and tool used in whaling to impale a whale when thrown; A type of textile closure, like an elongated button; Toggle (Doonesbury character), a character in the comic strip Doonesbury; Feature toggle, a technique in software development; Cordlock toggle, for stopping a cord or ...

4. Door breaching - Wikipedia

   en.wikipedia.org/wiki/Door_breaching

   Utilizing a breaching tool is unnecessary if the door is unlocked and easy to open. [5] [3] [6] [1] If the door is locked, breachers can attempt to force inward-opening doors with a strong kick. The breacher will aim to hit the door near the locking mechanism, but not kick the doorknob itself as one can easily twist an ankle doing so. [7]

5. Frog (fastening) - Wikipedia

   en.wikipedia.org/wiki/Frog_(fastening)

   A frog or pankou (simplified Chinese: 盘扣; traditional Chinese: 盤扣; pinyin: pánkòu), also called Chinese frog closure and decorative toggle [a] is a type of ornamental garment closure. Made from braiding , cord, fabric, or covered wire, they consist of a decorative knot button (a Chinese button knot for a traditional Chinese style [ 6 ...

6. Hook-and-loop fastener - Wikipedia

   en.wikipedia.org/wiki/Hook-and-loop_fastener

   Closures on backpacks, briefcases and notebooks often make use of hook-and-loop fasteners. Cloth diapers often make use of hook-and-loop fasteners. It is an integral part of games such as tag rugby and flag football, and is used in surfboard leashes and orthopaedic braces. NASA makes significant use of hook-and-loop fasteners.

7. Swing-door operator - Wikipedia

   en.wikipedia.org/wiki/Swing-door_operator

   Swing side, door mounted sensor—mounted on the swing side of the door itself, used as the door is opening to detect a user in the way of the opening door. In that case, the operator stops the door. The sensitivity of infrared sensors must be reduced at the end of the opening angle, if it starts seeing a wall next to the door, so it may not ...