Aircraft door hinge mechanism with selectively triggerable actuator

Abstract

A cam actuator (12) for rapidly opening an aircraft door (14) that is attached to an aircraft fuselage (18) by a hinge assembly (26). The actuator includes a piston (40), a piston rod (42) that is secured to the piston and rotating sleeve (44) that is fitted over the piston rod that functions as the hinge pin between a hinge clevis (26) on the aircraft and a hinge arm lug (54) on the hinge assembly. The piston is contained within a housing (38) adapted to receive a pressurized pneumatic gas. An annular cam (50) through which the piston rod travels and that is formed with an outer surface (104) having a helical profile is attached to the hinge clevis. A cam follower (46) is attached for the sleeve so as to rotate in unison therewith. The hinge arm lug (54) is also secured to the sleeve (44) for rotation. When the actuator of this invention is triggered, the piston rod (42) urges the cam follower (46 ) against the cam (50) so as to cause the cam follower to rotate. The cam follower (46) in turn rotates the sleeve (44) so as to simultaneously rotate the hinge arm lug (54). As a result of this rotation, the hinge is pivoted away from the hinge clevis so as to urge the aircraft door open.

Dependencies are inferred from the claim text.