Abstract: A push/pull operating device includes first and second operational devices mounted to two sides of a door. The first operating device includes a first bracket having a plurality of non-circular mounting holes. Two engaging rods extend through two of the mounting holes of the first bracket, the door, and a latch device mounted in the door. Each engaging rod has a limiting portion fixedly received in one of the mounting holes. A head of each engaging rod presses against the first bracket. The second operational device includes a second bracket having a plurality of non-circular mounting holes. A bolt is extended through one of the mounting holes of the second bracket and the door and engaged with one of the engaging rods. A head of each bolt presses against the second bracket. Thus, the first and second brackets are securely fixed to the sides of the door.

Abstract: A latch assembly includes a latch having a body. A stop having a lower melting point is received in an engagement hole of the body. An ear is pivotable between a storage position in a transverse groove of the body and a blocking position partially extending out of the transverse groove. A pressing pin is slideably received in a longitudinal hole in the body. The ear is located in the storage position when the pressing pin is in a non-pressing position, allowing pivotable movement of the latch between a latching position and an unlatching position. When the latch is in the latching position and the ear is in the storage position, if the stop is melted by heat, the pressing pin is moved from the non-pressing position to the pressing position and pivots the ear to the blocking position, retaining the latch in the latching position.

Abstract: A fire bolt assembly (10) includes a receiving tube (117) mounted in a door (106). A mounting member (32) is mounted to the receiving tube (117). A positioning bolt (151) is received in the receiving tube (117). A stop member (58) is securely mounted in the mounting member (32) to hold the positioning bolt (151) in the receiving tube (117). The front end (153) of the positioning bolt (151) is moved out of the receiving tube (117) by a spring (100) to engage with a coupling hole (116) in another door (112) or a door frame when the stop member (58) melts due to the heat of a fire, locking the door (106) in place during the fire. A stick (175) in the receiving tube (117) is moved to a blocking position preventing the front end (153) of the positioning bolt (151) from disengaging from the coupling hole (116).

Abstract: An outer operational device (13) for a door lock includes cover (20) receiving a sliding block (511) and a handle (197) operatively connected to the sliding block (511). The sliding block (511) includes a sliding groove (525) having a horizontal section (528) slideably receiving a locking member (541). A driving member (44) is fixed to a connection member (595) in the cover (20) and is operatively connected to a latch (124). When the locking member (541) is in a first position, pivotal movement of the handle (197) drives the sliding block (511) to actuate the connection member (595) and the driving member (44) to retract the latch (124). When the locking member (541) is in the second position, the sliding block (511) is moved without actuating the connection member (595) when handle (197) is pivoted, and the latch (124) remains in the latching position.

Abstract: A latch assembly includes a base having two sidewalls each having first and second guiding slots. A latch is pivotably connected to the base. A follower plate is movably received in the base and includes two sidewalls each having a restraining slot and an engaging notch. A safety plate is mounted between the sidewalls of the follower plate. A pin extends through the first guiding slots of the base, the restraining slots of the follower plate, and the safety plate. A positioning pin extends through the second guiding slots. A spring is attached between the positioning pin and the pin. When latch moves from a latching position to an unlatching position, the positioning pin moves along the second guiding slots of the base under action of the spring and engages with the engaging notches of the follower plate to retain the latch in the unlatching position.

Abstract: A latch device (14) includes a latch bolt (30) movable between a latching position and an unlatching position. A sleeve (775) is mounted to an outer side (13A) of a door (11) and operatively connected to an outer operational device (12). A clutch (575) is mounted to and jointly movable with the sleeve (775). An unlatching member (711) is operably connected to the latch bolt (30) and releasably engaged with the clutch (575). When the unlatching member (711) engages with the clutch (575), operation of a handle (502) of the outer operational device (12) retracts the latch bolt (30). When the unlatching member (711) disengages from the clutch (575), the latch bolt (30) remains in the latching position if the handle (502) is rotated.

Abstract: A door coordinator includes a base fixed to a mounting face of a door frame to which inactive and active doors are pivotably mounted. A pivotal member includes an axle pivotably mounted to the base. A first arm extends from an end of the axle. A shorter second arm is formed on the other end of the axle. A buffering wheel and a guiding wheel are rotatably mounted to the first and second arms, respectively. A pressing bolt is threadedly engaged in a screw hole in a rear end of the second arm. The pressing bolt is rotatable relative to the second arm to adjust a length of an exposed section of the pressing bolt outside of the screw hole, such that a height of each of the buffering wheel and the guiding wheel in a vertical direction relative to a longitudinal axis of the axle can be adjusted.

Abstract: An outer operational device includes a cover mounted to an outer side of a door. The outer operational device includes a handle and an actuating member operatively connected between the handle and a latch. A sliding block is movable between an alignment position and an alignment position under control of a driving device through electrification. When the sliding block is in the engagement position, a locking block locks the actuating member to prevent rotation of the handle, and the outer operational device is in a locked state avoiding retraction of the latch. When the sliding block is in the disengagement position, the sliding block allows rotation of the actuating member and the handle, and the outer operational device is in an unlocked state allowing retraction of the latch.

Abstract: A cylindrical lock includes a retractor (131) mounted between inner and outer operational devices (10, 12) and operably connected to a latch (779). The inner operational device (10) includes an inner chassis (20), an inner spindle (76), and an inner lining (60) made of a material harder than the inner spindle (76). The outer operational device (12) includes an outer chassis (305), an outer spindle (379), and an outer lining (353) made of a material harder than the outer spindle (379). Inner and outer returning devices (38A, 38B) are provided for returning the inner and outer spindles (76, 379). A torsion spring (50A, 50B) of each of the inner and outer returning devices (38A, 38B) is mounted to a push ring (40A, 40B) before assembly with the inner and outer chassis (20, 305), allowing easy assembly of the torsion springs (50A, 50B).

Abstract: A latch assembly (10) is mounted to a follower door (275) of a double door (257). When the follower door (275) is closed while a primary door (259) of the double door (257) is closed, an actuation latch (131) of the latch assembly (10) is moved from a releasing position to a pressing position to move a latch (231) of the latch assembly (10) to a latching position engaged in a groove (37, 300) in a door frame (31) or in the ground (299). When the actuation latch (131) is moved from the releasing position to the pressing position while the follower door (275) is not in the closed position, the latch (231) is retained in an unlatching position, avoiding damage to the latch assembly (10).

Abstract: An anti-pick latch assembly (10) is mounted to a follower door (275) of a double door (257). The latch assembly (10) includes an actuation latch (131) normally extending beyond an end face (291) of the follower door (257) and a latch (231) movable between an unlatching position received in the follower door (275) and a latching position extending out of the follower door (275) into a groove (37) in a door frame (31). When the follower door (275) is closed while a primary door (259) of the double door (257) is closed, the actuation latch (131) is actuated to move a limiting member (90) to a locking position, moving the latch (231) of into the groove (37) of the door frame (31). The limiting member (90) in the locking position prevents the latch (231) from moving out of the groove (37) while the latch (231) is picked.

Abstract: A stop device (400) for a door lock includes an anchor (430) pivotable relative to a connecting seat (402). When the anchor (430) is in an alignment position, a through-hole (446) of the anchor (430) is aligned with a positioning groove (420) of the connecting seat (402), and a notch (441) of the anchor (430) is aligned with a slot (414) in the connecting seat (402). When the anchor (430) is in an anchoring position, the through-hole (446) is misaligned from the positioning groove (420), the notch (441) is misaligned from the slot (414), and a stop portion (440) of the anchor (430) is received in and blocks the slot (414). A positioning member (452) is received in the through-hole (446) and the positioning groove (420) to retain the anchor (430) in the alignment position. When the positioning member (452) melts due to heat of a fire, the anchor (430) pivots to the anchoring position under action of gravity, preventing movement of a latch (38) from moving to an unlatching position.

Abstract: A door lock (2) includes a linking rod (730) movable in an unlatching direction for moving a latch (38) to an unlatching position and movable in a latching direction for moving the latch (38) to a latching position. When a draw bar (640) is in an extended position and when an operative member (688) is operated, a follower plate (482) and the connecting rod (730) are moved in the unlatching direction through a connecting member (498) and a connecting rod (512). When the draw bar (640) is in a retracted position and when the operative member (688) is operated, the connecting member (498) and the connecting rod (512) are moved in the unlatching direction. Movement of the follower plate (482) in the unlatching direction is stopped by a stop member (668), preventing movement of the linking rod (730) in the unlatching direction and retaining the latch (38) in the latching position.

Abstract: A latch assembly includes a base having two sidewalls each having a positioning hole. A follower plate includes two sidewalls each having an engagement hole that is aligned with the positioning holes when the latch is in a latching position and that is not aligned with the positioning holes when the latch is in an unlatching position. Two sleeves are mounted between the sidewalls of the follower plate. An end of each sleeve is received in the engagement hole of one of the sidewalls of the follower plate. A stop having a low melting point is received in each sleeve to retain a safety pin in the sleeve. When the stops melt due to heat of a fire while the latch is in the latching position, the safety pins are moved by a spring into the positioning holes of the base to retain the latch in the latching position.

Abstract: A cylindrical lock includes a retractor mounted between inner and outer operational devices and operably connected to a latch. The retractor includes an upper surface having an upper recess. The retractor further includes a lower surface having a lower recess. Two upper compartments are defined in two sidewalls of the upper recess and extend to two lateral surfaces of the retractor, forming two upper tongues. Two lower compartments are defined in two sidewalls of the lower recess and extend to the lateral surfaces of the retractor, forming two lower tongues. First and second rollers are rotatably received in the upper and lower recesses, respectively. A size of an opening of each of the upper and lower compartments is reduced by pressing a distal end of each upper tongue downward and by pressing a distal end of each lower tongue upward, retaining the first and second rollers in place.

Abstract: A cylindrical lock includes a retractor (131) mounted between inner and outer operational devices (10, 12) and operably connected to a latch (779). The outer operational device (12) includes an outer chassis (305), an outer lining (353) mounted around the outer chassis (305), and an outer spindle (379) received in the outer chassis (305). The outer spindle (379) includes an inner end (391) received in a pivot hole (375) of the outer lining (353). A restraining protrusion (397) is formed on an outer periphery of the outer spindle (379) and abuts an abutment face (376) of the outer lining (353), avoiding movement of the outer spindle (379) away from the outer chassis (305) in a longitudinal direction while allowing pivotal movement of the outer spindle (379) in a correct position.