Hartwell Corporation

Arthur W Dessenberger

Frank T Jackson

William R Bourne, Jr

An extended reach latch for an engine cowling and the like, including a housing having a housing slot, a hook pin carried in the housing, a hook having a hook slot, with the hook pin in the hook slot for sliding of the hook relative to the housing, first, second and third links, a first link pin joining the hook and the first link and sliding in the housing slot, a second link pin joining the first and second links, a third link pin joining the second and third links, with the third link pivoting on the hook pin, an outer handle pivotally mounted on the first link pin for movement between an open position and a closed position, and having an outer handle slot for the second link pin, and an inner handle pivotally mounted on the first link pin for movement between an open position and a closed position, and having an inner handle slot for the third link pin, with movement of the inner handle from its open position to its closed position moving the hook into the housing a first distance, and with movement of the outer handle from its open position to its closed position moving the hook into said housing a second lesser distance.

Extended reach latch

A pressure relief latch for latching a first panel to a second panel and for release under pressure, including a housing for mounting on the first panel, a spring loaded detent carried in the housing, and a bolt having a pivot axis and pivotally mounted on the housing for latching engagement with the second panel, with the detent including a free roller and a compression spring positioned along a central spring axis perpendicular to the pivot axis, and with the bolt having a curved exterior shape with a detent notch for receiving the roller. The housing is closed about the spring except for a threaded opening at one end and a roller opening at the other end, and a threaded plug is positioned in the threaded end for loading adjustment. The roller may be spherical or cylindrical.

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Riverside, CA, United States of America

Arthur W Dessenberger