| 主权项 |
1. A door lock comprising, in combination:
a latch device adapted to be fixed to a first side of a door, with the latch device including a latch pivotable about a first axis between an extended, latching position and a retracted, unlatching position, wherein when the door is in a closed position and the latch is in the extended, latching position, the door is retained in the closed position, and when the door is in the closed position and the latch is in the retracted, unlatching position, the door is moveable from the closed position to an open position; a housing including an end face defining a space, with the space including a bottom wall, with a receiving portion formed on the bottom wall, with a receiving hole defined in the receiving portion and in communication with the space and an outside, with the housing further including first and second pegs and an engagement hole, with the first peg located between the second peg and the engagement hole along the first axis, with the housing adapted to be mounted to the door, with the end face of the housing adapted to abut a second side of the door opposite to the first side of the door; a cylinder mounted in the receiving hole of the receiving portion, with the cylinder including an actuating plate rotatably received in the space of the housing; a spindle pivotably received in the engagement hole of the housing, with the spindle including an engagement end received in the space of the housing; a handle mounted to the spindle and located outside of the housing, with the handle pivotable between a first position and a second position, with the spindle pivoting jointly with the handle; a push block pivotably connected to the spindle, with the push block including a peripheral wall having a positioning groove, with the push block further including two push portions formed on an outer periphery of the push block, with the positioning groove located between the two push portions in a circumferential direction about a pivot axis of the spindle, with each of the two push portions including upper and lower ends spaced from each other along the first axis, with a connection hole extending from a side through another side of the push block and including an inner periphery having an insertion groove, with the engagement end of the spindle pivotably received in the connection hole of the push block; an actuator coupled to and pivotable together with the spindle, with an actuation hole extending from a side through another side of the actuator, with a tooth formed on the other side of the actuator and engaged in the insertion groove of the push block, with the engagement end of the spindle engaged with the actuation hole of the actuator, with the spindle pivotable together with the actuator; a positioning block received in the space of the housing and movable between an upper position and a lower position along the first axis, with the positioning block including upper and lower ends spaced from each other along the first axis, with the upper end of the positioning block including a coupling portion, with the lower end of the positioning block having a positioning portion, wherein when the handle is in the first position, the positioning portion of the positioning block is aligned with the positioning groove of the push block along the first axis; an actuating member pivotably received in the space of the housing, with the actuating member including a pivotal portion pivotably connected to the second peg of the housing, with the actuating member further including an engagement plate pivotably engaged with the coupling portion of the positioning block, with first and second stops formed on two sides of the pivotal portion, with the actuating plate of the cylinder pressing against one of the first and second stops when the actuating plate pivots; a movable block slideably received in the space of the housing, with the movable block including first and second surfaces spaced from each other, with the movable block further including a lower surface extending between the first and second surfaces, with a protrusion formed on the second surface of the movable block and located adjacent to the lower surface of the movable block, with the second surface abutting the positioning block, with the protrusion spaced from the positioning block along a second axis perpendicular to the first axis, with the movable block movable along the first axis between a releasing position and a pressing position, wherein when the movable block is in the releasing position, the lower surface of the movable block abuts the upper end of each of the two push portions of the push block; a sleeve pivotably connected to the housing, with the sleeve including a first end pivotably connected to the first peg of the housing and a second end, with the sleeve further including an arm formed on an outer periphery of the sleeve, with the arm having a distal end abutting the protrusion of the movable block, wherein when the movable block moves, the protrusion of the movable block presses against the arm of the sleeve, causing pivotal movement of the sleeve about a pivot axis defined by the first peg; and a follower rod coupled to the second end of the sleeve, with the follower rod pivotable together with the sleeve, with the follower rod including an end connected to and movable with the latch device, with the latch pivoting between the extended, latching position and the retracted, unlatching position when the follower rod pivots; wherein when the actuating plate of the cylinder pivots and presses against the first stop of the actuating member, the actuating member moves jointly with the positioning block from the lower position to the upper position, wherein when the positioning block is in the upper position and when the actuating plate of the cylinder pivots and presses against the second stop of the actuating member, the actuating member moves jointly with the positioning block from the upper position to the lower position, wherein when the positioning block is in the lower position and when the handle is in the first position, the positioning portion of the positioning block is engaged with the positioning groove of the push block, preventing the push block from pivoting from the first position to the second position, and avoiding the latch from moving from the extended, latching position to the retracted, unlatching position, wherein when the positioning block is in the upper position, the positioning portion of the positioning block is disengaged from the positioning groove of the push block, and the handle is movable from the first position to the second position, when the handle pivots from the first position to the second position, the tooth of the actuator presses against the push block, causing joint pivotal movement of the actuator and the push block, and the upper end of one of the two push portions of the push block presses against the lower surface of the movable block, moving the movable block from the releasing position to the pressing position, wherein the protrusion of the movable block pushes the follower rod to pivot through transmission of the sleeve, wherein the follower rod moves the latch from the extended, latching position to the retracted, unlatching position, wherein when the handle is in the second position, the movable block is in the pressing position, the latch is in the retracted, unlatching position, wherein when the positioning block is in the lower position, the positioning portion of the positioning block is engaged with the positioning groove of the push block, and when the tooth breaks due to forcible pivotal movement of the handle, pivotal movement of the spindle causes pivotal movement of the actuator without moving the push block. |
