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A latching structure defined by a mount, a handle pivotally mounted to the mount and linked with a latch pin slidably mounted in the mount. The linkage between the handle and the latch pin includes first parallel links pivotally mounted to the handle and pivotally mounted to the latch pin. Second li

A latching structure defined by a mount, a handle pivotally mounted to the mount and linked with a latch pin slidably mounted in the mount. The linkage between the handle and the latch pin includes first parallel links pivotally mounted to the handle and pivotally mounted to the latch pin. Second links are pivotally mounted to the first links and to a spring block slidably mounted on the latch pin. A spring is placed in compression between a shoulder on the latch pin and the spring blocks. Consequently, the linkage mechanism operates to actuate the latch pin with the handle and create an overcenter mechanism to bias the entire mechanism to either a fully opened position or a fully closed position. A gasket is provided on a flange associated with the handle to seal the latch mechanism when the mechanism is strongly biased by the spring into the closed position.

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A latching structure comprising a mount including a guideway; an elongate latch member slidably mounted in said guideway; a handle pivotally mounted to said mount to have a first, open position and a second, closed position; a first link pivotally mounted to said handle at a first end and pivotally

A latching structure comprising a mount including a guideway; an elongate latch member slidably mounted in said guideway; a handle pivotally mounted to said mount to have a first, open position and a second, closed position; a first link pivotally mounted to said handle at a first end and pivotally mounted to said latch member at a second end; a spring positioned on said latch member; a spring block slidably mounted on said latch member at a first end of said spring; a stop fixed to said latch member at a second end of said spring; and a second link pivotally mounted at a first end to said first link between said handle and said latch member and to said spring block at a second end, said spring being under compression between said spring block and said stop, said second link being pivotally mounted to said first link such that said second link crosses the longitudinal line of said latch member between said open and closed positions of said handle.