Safety trip lock for the drop side of a crib comprising a trip wire having an intermediate offset actuator portion, said wire extending to the ends of the crib and terminating in offset portions similar to cranks, together with a torsion spring maintaining said trip wire in a predetermined position, and latches at the end of the crib, i.e., on the corner posts, for receiving said offset ends in recesses therein, such that the trip cannot be operated unless the entire drop side is raised prior to moving the trip wire actuator.