a lock in which a closure structure carries a cammable latch bolt which is spring urged toward a latching position . stops are provided on the latch bolt and on a member carrying the latch bolt to normally prevent retracting movement of the latch bolt under inertia forces . the latch bolt is mounted for movement in a direction to displace the stops out of a registering position to permit camming of the latch bolt toward a releasing position during closing movement of the closing structure .