Self-locking double retention redundant pull pin release

Details Self-locking double retention redundant pull pin release Self-locking double retention redundant pull pin release

1985-05-23

1987-11-03

Marbert, James B.

Handling: hand and hoist-line implements

Hook, hoistline, or grab type

Load releasing means

294 8225, 294 8226, 294 8227, B64D 1738

Patent

active

047039671

ABSTRACT:
A double-retention redundant pull pin release system is disclosed. The system responds to a single pull during an intentional release operation. A spiral-threaded main pin is seated in a mating bore in a housing, which main pin has a flange fastened thereon at the part of the main pin which is exterior to the housing. Accidental release tends to rotate the main pin. A secondary pin passes through a slightly oversized opening in the flange and is seated in a second bore in the housing. The pins counteract against one another to prevent accidental release. A frictional lock is shared between the main and secondary pins to enhance further locking of the system. The secondary pin, in response to a first pull, is fully retracted from its bore and flange hole. Thereafter the pull causes the main pin to rotate free of the housing to release, for example, a parachute mechanism.

REFERENCES:
patent: 1829293 (1931-10-01), Olson
patent: 1930148 (1909-08-01), Brown
patent: 3120365 (1964-02-01), Gutacker
patent: 3295579 (1967-01-01), Medal
patent: 3865333 (1975-02-01), Fielding et al.
patent: 4237949 (1980-12-01), Wagner

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