Patent ID: 7287784

Claim:
A fire-blocking door lock structure mounted on a fire-blocking door comprising a frame member, a push handle and a casing, the casing fixed to a plate member and connected to a base body, the fire-blocking door lock structure comprising: a middle latch mechanism mounted in the casing; an upper latch mechanism and a lower latch mechanism symmetrically mounted on opposite sides of the middle latch mechanism and connected to the middle latch mechanism; and an actuation mechanism connected to the middle latch mechanism, comprising at least one revolving piece and a draft bar, wherein the revolving piece is mounted on the base body, and the draft bar penetrates the revolving piece and has one end thereof secured to a linking piece connected to the middle latch mechanism, such that when the push handle is pressed, the revolving piece is driven to actuate the draft bar, making the middle latch mechanism be driven by the draft bar to respectively and simultaneously actuate the upper latch mechanism and the lower latch mechanism; wherein the upper latch mechanism and the lower latch mechanism each comprises (1) a latching frame, (2) a latching support shiftably mounted in the latching frame, (3) a latching body shiftably disposed in the latching support, (4) a stop piece shiftably disposed in the latching frame and the latching support; wherein the stop piece is in contact with the latching body so as to move the latching body between a position where the latching body is retracted into the latching support and a position where the latching body is extended outside the latching support, and (5) a second driving piece having one side thereof pivotally connected to the stop piece and the other side thereof directly connected to the middle latch mechanism by a pull rod, such that the second driving piece receives force from the middle latch mechanism to move the stop piece and the latching body, wherein the latching body is formed with a stop portion corresponding in position to the stop piece, to allow the stop piece to abut against the stop portion and hold the latching body in the extended position, and wherein the latching frame and the latching support are formed with guide slots corresponding to each other.