Kissing gate. Allows people to pass through, but not livestock.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...e_fullsize.jpg
0:25 video:
More: https://en.wikipedia.org/wiki/Kissing_gate
Previously:
Simple gate latch - GIF
Rising underground driveway gate - GIF
Unique gate lock - GIF
Weight-sensitive drive-over wooden gate - GIF
Double pin swinging gate hinge - GIF
1955 Pontiac gate - photo
Multi-unlocking gate - GIF
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