Sub -door bolt

The utility model provides a sub -door bolt, the bolt includes locking device, last connecting rod, goes up bolt, lower connecting rod and time bolt, the upper end of going up the connecting rod with it connects to go up the lower extreme of bolt, the upper end of last bolt is stretched into the door frame and is performed, down the connecting rod the lower extreme with the upper end of bolt is connected down, the lower extreme of bolt stretches into the door frame lower gear down, locking device includes knob, fixing base, gear, goes up rack, lower rack and guide block, the one end of knob is equipped with the minor axis, the rear side at the fixing base is installed to the guide block, it is in with lower rack central symmetry distribution to go up the rack the left and right sides of gear lies in between guide block and the fixing base, go up rack and rack down all with gear engagement connects, what upward spacing post can reciprocate lies in go up in the guide way, what spacing post can reciprocate down