US 12,391,358 B2
Pressure differential lockout system and calibration method
Leanne M. Campbell, Mukilteo, WA (US)
Assigned to The Boeing Company, Arlington, VA (US)
Filed by The Boeing Company, Arlington, VA (US)
Filed on May 9, 2023, as Appl. No. 18/314,721.
Prior Publication US 2024/0376751 A1, Nov. 14, 2024
Int. Cl. B64C 1/14 (2006.01); E05B 77/54 (2014.01); E05B 81/10 (2014.01)
CPC B64C 1/1423 (2013.01) [B64C 1/1415 (2013.01); B64C 1/143 (2013.01); B64C 1/1461 (2013.01); E05B 77/54 (2013.01); E05B 81/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A pressure differential lockout system for a door separating a first region from a second region, the system comprising:
a follower linkage mechanically coupled with a latch release handle of a linkage assembly of the door;
a piston assembly including a piston and a piston housing collectively defining an interior chamber of the piston assembly; and
a fluid conduit that provides fluid communication between the first region and the interior chamber of the piston assembly;
wherein the piston is translatable along a translation axis relative to the piston housing responsive to a pressure differential between the interior chamber of the piston assembly and the second region in fluid communication with an exterior side of the piston from the interior chamber;
wherein the piston defines a channel that is parallel to the translation axis and that accommodates a follower component of the follower linkage;
wherein the channel defined by the piston inhibits rotation of the follower linkage within a first translation range of the piston along the translation axis and enables rotation of the follower linkage within a second translation range of the piston along the translation axis.