Patent ID: 7044510

Claim:
A fire door lock mechanism comprising a first opening unit located within a fire door and coupled to an opening member mounted on a surface of the fire door for operating a lock bolt of a lock bolt mount that is disposed within the first opening unit to allow the fire door lock mechanism to enter a released or engaged state; and a second opening unit mounted on an opposite surface of the fire door corresponding in position to the opening member, wherein the second opening unit comprises: a base plate; a handlebar capable of being pressed to move relative to the base plate; two actuators rotatably disposed inside the handlebar and bent to form a central portion and two end portions, each of the portions being formed with a hole; two second horseshoes provided at two bottom ends of the handlebar respectively, each of the second horseshoes being formed with a hole at the bottom end thereof for accommodating a pin inserted into the hole of one end portion of a respective corresponding one of the actuators; two first horseshoes provided at two ends of the base plate respectively, each of the first horseshoes being formed with a hole at the top end thereof for accommodating a pin inserted into the hole of the central portion of a respective corresponding one of the actuators; a push rod, each end of the push rod being provided with a pin for coupling the hole of the other end portion of a respective corresponding one of the actuators; and a swing arm coupled to an end of the push rod and extended to the inside of the fire door, the swing arm being driven by a motion of the push rod coupled to the handlebar to operate the lock bolt and allow the fire door lock mechanism to enter the corresponding released or engaged state, wherein the actuators, the first horseshoes, the second horseshoes and the push rod are configured such that when the second horseshoes receive a force from the handlebar and move downwardly accordingly, the actuators swing about the first horseshoes as pivots, to thereby induce a horizontal movement of the push rod, wherein the opening member is a rotational handle coupled to a rotation member which is mounted inside the fire door and comprises an upper disk and a lower disk, the upper and lower disks being used to rotate an upper rotatable plate and a lower rotatable plate each being provided with an arm used to drive the lock bolt mount to move horizontally.