Door lock-and-handle assembly

A door lock-and-handle assembly adapted to be mounted on a door panel, said door lock-and-handle assembly comprising:

• a bolt receiving housing adapted to be mounted in the door panel and including a faceplate that is formed with a bolt opening;
• a latch bolt mechanism including a latch bolt mounted movably in said bolt receiving housing and movable in a transverse direction relative to said faceplate between extended and retracted positions for moving in and out of said bolt opening, and a latch biasing member that urges said latch bolt to move toward said extended position;
• a sliding member mounted slidably in said bolt receiving housing and connected to said latch bolt so as to be synchronously movable with said latch bolt in said transverse direction;
• a spindle defining an axis, extending through said bolt receiving housing in a direction transverse to said sliding member, and rotatable about said axis;
• inner and outer handles adapted to be mounted rotatably on two opposite sides of the door panel, respectively, and coupled to said spindle so as to be co-rotatable with said spindle about said axis;
• a driving member connected to and projecting from said spindle in a radial direction relative to said axis so as to be co-rotatable with said spindle about said axis between first and second angular positions, and engaging said sliding member so as to move said latch bolt from said extended position to said retracted position against urging action of said latch biasing member when said driving member moves from said first angular position to said second angular position, and so as to be moved from said second angular position to said first angular position when said latch bolt moves from said retracted position to said extended position by the urging action of said latch biasing member;
• a locking unit including a locking member pivotally mounted in said bolt receiving housing and movable in an axial direction parallel to said axis between a locked position, in which, said locking member engages said driving member so as to prevent co-rotation of said spindle and said driving member and sliding movement of said sliding member, and an unlocked position, in which, said locking member disengages from said driving member so as to permit co-rotation of said spindle and said driving member and sliding movement of said sliding member, said locking unit further including an operating lever connected to said locking member and having an operating end exposed from said bolt receiving housing for actuating said locking member to move between said locked and unlocked positions;
• and
• a lock releasing member including a cam mechanism that has a cam member formed on said sliding member, and a cam follower formed on said locking member, said cam member engaging said cam follower when said locking member is disposed at said locked position in such a manner that when said latch bolt is pushed and is moved in said transverse direction from said extended position to said retracted position, said cam member will move together with said sliding member in said transverse direction so as to drive said cam follower, which, in turn, results in axial movement of said locking member from said locked position to said unlocked position, thereby disengaging said locking member from said driving member and permitting co-rotation of said driving member and said spindle.