Patent ID: 8628128

Claim:
A tertiary lock for securing a pivot door of a thrust reverser to a fixed structure of an aircraft to prevent the pivot door from inadvertently opening in a generally outward direction, the lock comprising: a housing fixedly attached to or integral with the fixed structure; a lock arm comprising a first portion inward of the housing and a second portion configured to extend at least partially outward of the housing in an aft direction through an opening of the fixed structure; a lock arm/housing pivot configured to pivotally attach the lock arm to the housing; and a lock arm receiver fixedly attached to or integral with the pivot door and configured for receiving the second portion of the lock arm, such that the lock arm prevents movement of the pivot door in the generally outward direction, wherein the second portion of the lock arm is configured to travel along a rotational path about the lock arm/housing pivot such that when the lock arm is pivoted away from the pivot door, at least a part of the second portion pushes inward against the lock arm receiver while simultaneously sliding or rolling in a generally forward direction along the lock arm receiver, thereby urging the pivot door in a generally inward direction, thereby overstowing the pivot door, until the lock arm pivots far enough that the second portion does not contact the lock arm receiver, thereby unlocking and releasing the pivot door to open in the generally outward direction.