Fire-blocking door lock structure

A fire-blocking door lock structure, comprising:

• a latching member mounted in a lock casing to be mounted on a fire-blocking door;
• and
• an actuation mechanism mounted in the latching member, the actuation mechanism comprising a latch body which swings smoothly and is formed with a stop portion;
• a stop piece which prevents retraction of the latch body and is connected to a fire-blocking piece;
• a safety latching member which prevents the latch body from retraction into the latching member when the safety latching member abuts against the stop piece;
• a guide rod for allowing the latch body to be blocked by the fire-blocking piece when the safety latching member abuts against the stop piece;
• an actuating piece for guiding the latch body and the guide rod in motion by a force, to allow the latch body to be retracted into the latching member to open the fire-blocking door when the stop piece fails to block the stop portion, and allow the stop piece to be blocked by the stop portion when the fire-blocking piece melts under a high temperature, so as to prevent the latch body from retraction into the latching member and assure lockup of the fire-blocking door;
• and
• a boss penetrating the bottom of the safety latching member and a slot formed on a side wall of the latching member, to allow the safety latching member to be retracted into the latching member;
• the boss having a stop bolt penetrating the safety latching member;
• the stop piece having one side formed with a first end and the other side formed with a second end, allowing the first end to abut against the stop bolt of the boss to maintain the safety latching member at a bias position to move downwards, the second end being coupled to one end of an elastomer, with the other end of the elastomer being coupled to the top of the latching member, making the stop portion move upwards by elastic extension of the elastomer;
• and
• the stop piece having an upright portion formed on the second end thereof, allowing the fire-blocking piece to be coupled to an upright side wall of the upright portion.