A delayed return mechanism, such as for a door latch, including a housing having a hole with an axis, a cavity in the housing at least partially filled with a fluid media, a hub disposed in the cavity including a spindle hole coaxial with the hole in the housing including teeth within the spindle hole to engage a spindle, the hub being rotatable about the axis and having a fin extending radially outward in the cavity, and a channel through which the fluid media passes during rotation of the hub to control flow of the fluid media about the cavity.

A delayed return mechanism, such as for a door latch, including a housing having a hole with an axis, a cavity in the housing at least partially filled with a fluid media, a hub disposed in the cavity including a spindle hole coaxial with the hole in the housing including teeth within the spindle hole to engage a spindle, the hub being rotatable about the axis and having a fin extending radially outward in the cavity, and a channel through which the fluid media passes during rotation of the hub to control flow of the fluid media about the cavity.

A deadbolt assembly with a latch assembly and a lock cylinder. The deadbolt assembly includes a first torque blade longitudinally extending along a first axis and a second torque blade longitudinally extending along a second axis. The second torque blade is operatively coupled with the latch assembly to actuate the bolt between the retracted position and the extended position. The deadbolt assembly includes a geared arrangement operatively coupling the first torque blade and the second torque blade. The gear arrangement is configured to apply rotational movement of the first torque blade to the second torque blade.

A fixing structure for a lock includes a mounting plate, a cover plate, and a drive plate. The mounting plate is fixedly disposed on a door plank and includes a guided post and a locking slot structure. The cover plate includes an obstruction post, a guiding slot, and an engaging structure. The drive plate has a protruding tab and is rotatably disposed on the cover plate. The cover plate aligns with the mounting plate through the guided post being slidably disposed in the guiding slot. The drive plate is configured to rotate with the cover plate such that the engaging structure engages the locking slot structure. A lock includes two handle sets and the fixing structure. One of the handle sets and the mounting plate are fixedly disposed at opposite sides of the door plank. The other handle set passes through the cover plate and connects with the drive plate.

A lock defining a rotating axis and being installed on a door includes a mounting plate, a fastening member and a first handle set. The mounting plate is disposed on a side of the door and includes a mounting plate body and a protruding lug connected to the mounting plate body. The mounting plate body includes a locking slot structure. The protruding lug includes a fastening hole. The fastening member is inserted through the fastening hole of the protruding lug to fix the mounting plate on the door. The first handle set is assembled on the mounting plate. The first handle set includes an engaging structure and a decoration cover. The engaging structure is engaged with the locking slot structure to fix the first handle set on the mounting plate. The decoration cover covers the mounting plate and includes an opening corresponding to the fastening hole.

A door lock includes a main part including an axial tube and a connection tube extending on two ends thereof. A mounting plate has a mounting hole and at least one first engaging portion. A first plate has at least one second engaging portion which faces the mounting plate. Multiple first fixing members extend through the first plate and are not connected to the mounting plate. A second plate is mounted to the connection tube and includes multiple positioning holes. Multiple fastening members extend through the positioning holes and are connected to the first fixing members. The second connection portion is threadedly connected to the first connection portion to adjust a distance between the mounting plate and the main part so that the door lock can be installed to doors of different thicknesses.

A deadbolt assembly with a latch assembly and a lock cylinder. The deadbolt assembly includes a first torque blade longitudinally extending along a first axis and a second torque blade longitudinally extending along a second axis. The second torque blade is operatively coupled with the latch assembly to actuate the bolt between the retracted position and the extended position. The deadbolt assembly includes a geared arrangement operatively coupling the first torque blade and the second torque blade. The gear arrangement is configured to apply rotational movement of the first torque blade to the second torque blade.

An exemplary lockset is configured for installation in a standard door preparation, and includes an exterior assembly, an interior assembly, and a center assembly connecting the exterior and interior assemblies. The exterior assembly includes an exterior escutcheon which houses a credential reader assembly including a multi-tech credential reader. The interior assembly includes an interior escutcheon which houses a control system. The center assembly includes a chassis, an outer surface of which may define a channel. The credential reader assembly is in communication with the control assembly via a wire harness, a portion of which may pass through the channel.

An exemplary lockset is configured for installation in a standard door preparation, and includes an exterior assembly, an interior assembly, and a center assembly connecting the exterior and interior assemblies. The exterior assembly includes an exterior escutcheon which houses a credential reader assembly including a multi-tech credential reader. The interior assembly includes an interior escutcheon which houses a control system. The center assembly includes a chassis, an outer surface of which may define a channel. The credential reader assembly is in communication with the control assembly via a wire harness, a portion of which may pass through the channel.

A door lock case has a main body. The main body includes a square tongue therein. The square tongue is connected with an electric control unit and a manual control unit. The electric control unit has a driving member. The driving member is connected with a driven member. The driven member is connected to the square tongue. The electric control unit further has a drive source. The drive source first drives the driving member to move the driven member, so that the driven member moves the square tongue to an unlocked position and then drives the driving member to move to a clutch position, so that the driving member is disengaged from the driven member. In this way, the user can directly open the door to pass through the door after unlocking and can control the movement of the square tongue manually via the manual control unit.