Aircraft door latch lock mechanism

Details Aircraft door latch lock mechanism Aircraft door latch lock mechanism

1991-07-16

1994-04-26

Peters, Jr., Joseph F.

Aeronautics and astronautics

Aircraft structure

Details

292259R, 292215, 49395, B64C 114

Patent

active

053059697

ABSTRACT:
A latch lock mechanism (20) for opening and closing a translating motion-type aircraft door (22). The latch lock mechanism (20) of this invention includes a latch shaft (38) that is mounted to the door (22) by a set of follower bearings (98) that are axially offset from the shaft. The shaft (38) is rotated by a lift lock mechanism (44) that includes a lift lock cam (106) and a cam follower (108) that tracks the cam, and a door drive linkage (1 10) that is attached to the cam follower for rotating the latch shaft. The lift lock cam (106) is rotated by a handle shaft (42) that is actuated by a handle (40). When the handle (40) is rotated, the lift lock cam (106) is similarly rotated so as to cause the upward movement of the door drive linkage (110) in the rotation of the latch shaft (38). The follower bearings (98) rotate about the latch shaft (38) so as to lift the latch shaft and the door (22) upwards so as to allow the door to clear fixed fuselage stop tabs (32) so that the door can be moved to an open position. An auxiliary latch-hold up cam mechanism (46) forces the door (22) open in the event the latch shaft (38) and associated components fail. A pressure vent door (34) is selectively opened by an associated opener assembly (48) connected to the handle shaft (42). In the event an attempt is made to open the door while the aircraft is in flight, the pressure vent door opener assembly (48) locks out so as to inhibit movement of the handle shaft (42) that would actuate the latch shaft (38) and open the door (22).

REFERENCES:
patent: 2751636 (1956-06-01), Heinemann et al.
patent: 3004303 (1961-10-01), Wilmer
patent: 3051280 (1962-08-01), Bergman et al.
patent: 3791073 (1974-02-01), Baker
patent: 4125235 (1978-11-01), Fitzgerald et al.
patent: 4720065 (1988-01-01), Hamatani
patent: 4944473 (1990-07-01), Kallies et al.

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