US 12,421,765 B2
System for latching and locking an aircraft door
John Richard Savidge, Sooke (CA); Peter Lyver, Beaconsfield (CA); Jean-Philippe Demers, Verdun (CA); David Riviere, Laval (CA); Remi Crozier, Montréal (CA); and Patrick Serres, Montréal (CA)
Assigned to BOMBARDIER INC., Dorval (CA)
Filed by BOMBARDIER INC., Dorval (CA)
Filed on Dec. 5, 2019, as Appl. No. 16/704,443.
Claims priority of provisional application 62/776,730, filed on Dec. 7, 2018.
Prior Publication US 2020/0181948 A1, Jun. 11, 2020
Int. Cl. E05B 57/00 (2006.01); B64C 1/14 (2006.01); E05B 79/12 (2014.01); E05B 81/20 (2014.01); E05B 85/12 (2014.01)
CPC E05B 57/00 (2013.01) [B64C 1/1407 (2013.01); B64C 1/143 (2013.01); E05B 79/12 (2013.01); E05B 81/20 (2013.01); E05B 85/12 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A system for latching and locking a semi-plug type aircraft door, the system comprising:
a hinge pivotally coupling the aircraft door to a fuselage of an aircraft, said hinge being disposed at a lower portion of an opening of the fuselage;
a latch configurable between: a latched configuration where the latch interferes with a lift mechanism configured to cause lifting of the aircraft door to permit opening of the aircraft door; and an unlatched configuration where the lift mechanism is permitted to cause lifting of the aircraft door, said lift mechanism comprising at least one crank attached to a lift shaft;
a lock configurable between: a locked configuration where a configuration change of the latch from the latched configuration to the unlatched configuration is prevented; and an unlocked configuration where the configuration change of the latch from the latched configuration to the unlatched configuration is permitted;
two lift rods, each lift rod having a respective first end coupled to the at least one crank and a respective second end coupled to the hinge;
a vent flap movable between an open position and a closed position, the vent flap being drivingly coupled to the lock so that a movement of the vent flap drives a configuration change of the lock;
a handle; and
a rotatable handle shaft drivingly couple to the handle so that a movement of the handle causes a rotation of the handle shaft,
wherein:
the handle shaft is drivingly coupled to the vent flap so that the rotation of the handle shaft drives the movement of the vent flap;
the lift mechanism, through rotation of the at least one crank with the lift shaft driving a movement of the lift rods, provides lifting during an initial opening stage in order to permit door pressure stops attached to the aircraft door to clear and move past corresponding fuselage pressure stops, such that the door pressure stops are free to move outwardly from the fuselage of the aircraft such that the aircraft door is openable by pivotal movement of the aircraft door;
a clearance between the door pressure stops and the fuselage pressure stops during the initial opening stage is provided by a lifting motion of the aircraft door, and lowering of the aircraft door for closing thereof causes the door pressure stops and the fuselage pressure stops to align such that the door pressure stops rest against the fuselage pressure stops and a pressure differential between an interior and an exterior of the aircraft causes the aircraft door to be securely held via the door pressure stops and the fuselage pressure stops;
the latch, the lock and the lift rods are disposed within an airstair on an interior side of the aircraft door;
the handle is disposed on a side of the airstair and accessible to a flight crew;
the handle is drivingly coupled to the lift mechanism and to the latch;
actuation of the handle in a first direction drives the unlocking, the unlatching and the lifting of the aircraft door during opening of the aircraft door; and
actuation of the handle in a second direction reverse to the first direction drives the lowering, the latching and the locking of the aircraft door during the closing of the aircraft door.