Trunnion

16th-century depiction of a cannon with trunnions

Philadelphia Penrose bridge c. 1880 (shown open) swings on a Trunnion Bearing.

A trunnion (from Old French "trognon", trunk) is a cylindrical protrusion used as a mounting and/or pivoting point. First associated with cannon, they are an important military development.

Alternatively, a trunnion is a shaft that positions and supports a tilting plate. This is a misnomer, as in reality it is a cradle for the true trunnion.

单词	Trunion
释义	Trunion 英语百科 Trunnion A trunnion (from Old French "trognon", trunk) is a cylindrical protrusion used as a mounting and/or pivoting point. First associated with cannon, they are an important military development. Alternatively, a trunnion is a shaft that positions and supports a tilting plate. This is a misnomer, as in reality it is a cradle for the true trunnion.
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Trunion

Trunnion