Abstract: A fire door lock mechanism is provided, allowing a user to directly push and press a handlebar forwards to activate a lock bolt and open a fire door mounted with the lock mechanism in a comfortable manner. A first opening unit of the lock mechanism is located inside the fire door to operate the lock bolt. The handlebar is located in a second opening unit of the lock mechanism on the fire door. The handlebar, being pressed, activates a link arm connected thereto and accordingly induces a swing arm coupled to the link arm to generate a swing motion, so as to allow a pulley formed at one end of the swing arm to extend into the first opening unit and drive a lock bolt mount connected to the lock bolt to move horizontally, thereby making the lock bolt retract to release the lock mechanism.

Abstract: A damping apparatus for a reciprocating pneumatic tool mainly includes a cylindrical damper. The damper has a front opening and an enlarged rear end. The front opening is attached to a cylinder of the reciprocating pneumatic tool. A damping segment is formed between the front opening and the enlarged rear end of the damper. A spiral slot is defined longitudinally through the enlarged rear end of the damper. Several slots are defined parallel and transversely in the damping segment of the damper and communicate with the spiral slot. The damping segment has gaps arranged longitudinally by the slots such that the structure has high internal damping to attenuate shock that is caused by return movement of a piston in the cylinder. Consequently, a user holding the pneumatic tool can feel comfortable.

Abstract: A door lock is proposed, in which an outside knob assembled at the outside of a door can be manually controlled to be operationally associated with or dissociated from the door lock. When the door lock is fastened, the outside knob can be selectively decoupled from the door lock and become idle; this is greatly beneficial as to prevent the door lock from being damaged even if the outside knob is exerted with external impact or forcibly turned by a strong force. The door lock is further provided with a fireproof mechanism, which prevents the door from being opened during a fire, thereby confining spreading of the fire to minimize fire-induced damage.

Abstract: A door lock is proposed, in which an outside knob assembled at the outside of a door can be manually controlled to be operationally associated with or dissociated from the door lock. When the door lock is fastened, the outside knob can be selectively decoupled from the door lock and become idle; this is greatly beneficial as to prevent the door lock from being damaged even if the outside knob is exerted with external impact or forcibly turned by a strong force. The door lock is further provided with a fireproof mechanism, which prevents the door from being opened during a fire, thereby confining spreading of the fire to minimize fire-induced damage.