Security sliding door system

A security sliding door system comprising a door frame having a doorway, a first sliding door mounted in said door frame, said door frame having a vertically extending first door storage recess in one side thereof and aligned with said first door, means mounting said first door slidably in said door frame whereby said first door can slide from a storage position in which it is at least mostly in said first storage recess to a doorway closing position for closing a part of said doorway, said door frame having a first door locking opening extending from an inner side of said door frame to said first door storage recess, a security pin, said first door having a first door security pin receiving opening entering from its inner side, said first door security pin receiving opening being disposed in registry with said first door locking opening at times when said first door is in a certain closing position in said doorway, and a security pin in said first door locking opening and also in said security pin opening of said door whereby said first door is locked into said closing position, a second sliding door in said door frame, said system having a duplicate of all parts above mentioned in similar operational positions with respect to said second door and correlating said second door with said door frame for storage and locking, said second door sliding toward and away from said first door and when closed said doors substantially abutting each other, said doors sliding in substantially the same plane, a stop means disposed in a position so as to limit movement of said doors in door closing directions so that when said doors are against said stop means said first door security pin receiving opening is in registry with said first door frame locking opening so that said security pin can be easily inserted at least through part of said door frame and into said first door, and means attaching said stop means to said door frame.