DOOR BLOCKING MECHANISM Russian patent published in 2008 - IPC E05B13/00 

FIELD: fixed constructions; blocking mechanism.

SUBSTANCE: blocking mechanism includes knob having an inner channel connected to the adjacent end of a locking shaft. Said channel allows to turn the knob in opposite directions with respect to the locking shaft to a predetermined angle of displacement. When knob is at one end of the channel, it comes to an initial position, interacts with the locking shaft and allows to turn the latter in the direction of retraction of a locking tab from locking position, and when the knob is at another end, it comes to a blocking position, interacts with the lock shaft and do not allow to turn the latter in the direction of opening. A blocking element, which is arranged inside the knob wherein it can displace and is guided by a control means, interacts in the blocking position with one of the two holding devices depending on whether the knob is turned to the right or to the left.

EFFECT: improvement of the blocking device.

15 cl, 19 dwg