Abstract: An auto-unlock assembly for a tubular lock has a rotating pipe, a rotating mount, a positioning board, a rotating spindle, a limiting mount, an retaining board and a limiting spring. The rotating pipe has a through hole. The rotating mount is connected to the rotating pipe and has two connecting wings. The positioning board is mounted in the rotating mount and has a body and two positioning wings. The rotating spindle is rotatably mounted through the rotating pipe and the positioning board via the rotating mount and has two protruding blocks. The limiting mount is mounted around the rotating spindle and has an acting face, a limiting recess and two mounting recesses. The retaining board is mounted around the rotating spindle, abuts the limiting mount and has a base and two protruding lugs. The limiting spring is mounted around the rotating spindle and abuts the retaining board.

Abstract: A tubular lever lock has a lock body and a bolt connected to each other, an interior handle assembly, an exterior handle assembly, an interior button assembly connected to the interior handle assembly and the lock body, and an exterior clutch assembly connected to the exterior handle assembly and the lock body. Position of an adjusting tube relative to a driving rod of the interior button assembly is adjustable to allow the tubular lever lock to match a thickness of a door. A pressing panel and a transmission tube of the exterior clutch assembly are able to disengage from each other so the exterior handle assembly is unable to drive the lock body.

Abstract: A latch assembly having adjusting backset includes a casing, a latch bolt and a latch rear section. The latch bolt includes a bolt body and a fixed member connected with the bolt body. The top of the fixed member includes two positioning notches adapted to different backsets. A positioning member and the fixed member are disposed in a slide. The positioning member includes a positioning projection corresponding to the positioning notch at the front portion thereof. The latch includes a pin that can lift the positioning member to disengage the positioning projection from the positioning notch. Then, the positioning projection is moved to another positioning notch, thereby changing the backset. The latch assembly includes a positioning spring to keep the positioning projection fixed in the positioning notch. The latch assembly may include an upper connecting member, a lower connecting member and an assembly member to strengthen the latch assembly.

Abstract: An exterior lever lock device with a clutch assembly is mounted on a door, is connected to a bolt and an indoor lever lock device and has a lever assembly, a driving assembly, a clutch assembly and a driven assembly. The driven assembly has an inner sleeve and a locking panel fastened to the clutch assembly and selectively engaging the inner sleeve. Therefore, whenever the lever lock is locked or unlocked, as long as there is a turning force applied to the lever assembly, the lever assembly turns and is not broken easily. An endurance of the exterior lever lock device is prolonged for improved lock performance.

Abstract: A latch assembly includes a latch bolt, a housing, an actuating plate connected with the latch bolt, a positioning casing, a lower connecting plate and an upper connecting plate engaged with each other and disposed in the positioning casing, and a driving plate disposed between the actuating plate and the lower connecting plate. The actuating plate is formed with a long slot and two symmetrical protrusions projected from the bottom. The driving plate includes a square hole, whose front end can be engaged with the protrusions and driving the actuating plate to move. The upper connecting plate includes two pairs of symmetrical recesses and the positioning casing includes two protrusions corresponding to the recesses of the upper connecting plate. By connecting the protrusions of the positioning casing with two pairs of the recesses, the latch assembly can be adjusted from a backset to the other backset dimension.

Abstract: A door lock includes outer assemblies, latch assemblies and inner assemblies. The inner assemblies has a turning switch, fixing bolts, an interior rose and a detent device that includes an inner plate, a stop plate, a stop seat, a rotating spring, a retaining spring and a sprag. By pressing down the stop plate as the latch bolt is in a casing, a protruding block of the stop seat is engaged with a protruding member of the stop plate. The spindle can not rotate backward and maintains in an unlocked state. After the stop plate is pressed upward, the turning switch returns to a locked state and the latch bolt extends out of the casing. Therefore, the detent device can keep the latch bolt in the casing and keep the lock in the unlocked state.

Abstract: A door lock includes a panel, a base plate, and a middle plate. A handle and a thumb-turn are rotatably mounted on the panel, wherein the thumb-turn has a first spindle mounted on the middle plate and engaged with the thumb-turn, an upper cam mounted on a rear end of the first spindle. The handle has a second spindle mounted on the middle plate and engaged with the handle, and a lower cam with two shoulders mounted on a rear end of the second spindle. A linking sheet is provided between the middle plate and the base plate and has two legs each having a foot pushed by the respective shoulder and an upper end pushing the upper cam. Two slots are defined in the legs, and two springs are received in the longitudinal slots and are pressed between first stops and second stops.

Abstract: A lock device includes an external cylinder body, a latch unit, a screw part and an inner lock body that are combined together. The inner lock body has an inner cover plate set, a washer plate, a spring, a spring plate, an inner connecting plate and an inner lever handle. A pair of opposite openings is located at a periphery of the inner cover plate set. An inner drive cylinder is configured on the inner cover plate set. The inner connecting plate is easily to be disassembled without other tools to assist when the inner connecting plate has to be replaced, so as to there is no tool damage the lock device and the door board.

Abstract: A reversible latch assembly has a faceplate assembly, a latch bolt assembly, a bolt-releasing assembly, a guardian bolt assembly, a driver assembly and a casing assembly. The latch bolt assembly, the bolt-releasing assembly and the guardian bolt assembly are rotatably mounted inside the casing assembly and allow the latch assembly to be reversed and used in either a clockwise or counterclockwise opening door.

Abstract: A lock set with a quick changeability has a plug, a cylinder, a seat, a ring and a sliding cover. The plug is mounted in the cylinder and has multiple first holes in rows wherein multiple lower pins are inserted. The cylinder has a chamber radially defined therein wherein the plug is inserted, and a lug formed in a top end thereof. Multiple second holes in rows are respectively defined in the lug and multiple upper pins and springs are inserted into the second holes. Multiple openings in rows are respectively defined in a lower inner wall of the cylinder wherein upper pins and springs are inserted into the second holes. The sliding cover abuts the lower inner wall of the chamber and has multiple orifices in rows defined therein. Hence, it is easy for a user to change a corresponding key.