Locking arrangement for sliding doors

A sliding structure comprising at least a pair of opposing horizontally movable door panels engaged with a horizontal trackway, each door panel including a vertical stile, the stile of one door panel having formed therein a vertical groove extending throughout the height of the door panel and the opposing door panel having formed thereon a vertical tongue adapted to enter said vertical groove when the two door panels are in closed stile-to-stile abutting relationship, said vertical groove and tongue being rigid throughout their lengths whereby interengagement of the groove and tongue significantly reinforces the abutting stiles against bending in the outside to inside direction with reference to the door, top and bottom vertical axis sliding bolts contained in the stile having said vertical groove and being disposed closely adjacent to one side of the groove and tongue when the latter are in fully engaged interfitting relationship, a swinging bolt having a horizontal swing axis on the stile of the door panel having said tongue and being disposed at an elevation between said top and bottom sliding bolts and having a hook-like locking extension extending forwardly of the stile on which said swinging bolt is mounted and being received lockingly through a slot provided in the opposing stile having said groove, and the hook-like locking extension when in the active door locking position being disposed closely adjacent to one side of the groove and tongue when the latter are in fully engaged interfitting relationship.