Door lock system

A door lock system comprising:

• a control mechanism transversely mounted in a door in the middle, said control mechanism comprising an elongated casing fixedly mounted on said door in a horizontal position, a movable pressure plate coupled to said casing, and a linking mechanism mounted inside said casing and coupled to said movable pressure plate;
• a transmission mechanism mounted in one hollow stile at one lateral side of said door and coupled to the linking mechanism of said control mechanism at one end at right angles, said transmission mechanism comprising a top transmission rod and a bottom transmission rod vertically disposed in reversed directions;
• a bottom latch assembly mounted in said hollow stile near the bottom, said bottom latch assembly comprising a first shell fixedly fastened to said hollow stile on the inside near the bottom, and a bolt inserted through the first shell of said bottom latch assembly and coupled to the bottom transmission rod of said transmission mechanism;
• and
• a top latch assembly mounted in said hollow stile near the top and coupled to the top transmission rod of said transmission mechanism;
• wherein said top latch assembly comprises:
• a second shell mounted inside said hollow stile and having at least one mounting hole adapted for fastening to a respective mounting hole in said hollow stile;
• a movable latch bolt pivoted to the second shell of said top latch assembly and adapted for engaging a retainer rod in a catch plate in a door frame to secure said door to said door frame;
• a frame mounted in the second shell of said top latch assembly, said frame comprising a pivot transversely disposed at a top side thereof, a mounting notch, a bottom opening, a plurality of screw holes vertically spaced at a rear side thereof and adapted for fastening to said hollow stile, and a fine adjustment hole spaced between the screw holes of said frame;
• a push member having one end pivoted to the second shell of said top latch assembly, and an opposite end pivoted to the pivot of the frame of said top latch assembly;
• a locating device mounted in the frame of said top latch assembly, said locating device comprised of a first locating plate, and a second locating plate, said first locating plate comprising a vertical section inserted into the mounting notch of the frame of said top latch assembly, a coupling slot in the vertical section of said first locating plate, a horizontal section extending from a bottom side of the vertical section of said first locating plate at right angles, a through hole and a screw hole spaced in the horizontal section, the screw hole of the horizontal section of said first locating plate being fixedly secured to the frame of said top latch assembly by a screw, said second locating plate comprising a vertical section inserted into the bottom opening of the frame of said top latch assembly, an upright extension strip extending from a top side of the vertical section of said second locating plate the top, a horizontal section extending from a bottom side of the vertical section of said second locating plate at right angles and inserted into the coupling slot of said first locating plate, and a through hole aligned with the through hole of said first locating plate;
• an actuating device, said adjustment device comprising a socket coupled to said top transmission rod of said transmission mechanism, a movable rod having one end pivoted to said socket and an opposite end inserted through the through hole of said first locating plate and the through hole of said second locating plate;
• a fine adjustment device mounted in the fine adjustment hole of the frame of said top latch assembly, and adapted for stopping against the upright extension strip of said second locating plate of said locating device for securing the movable rod of said actuating device to said locating device;
• said latch bolt of said top latch assembly is driven by said transmission mechanism to turn downward from said catch plate when the pressure plate of said control mechanism is depressed to move said link, permitting said fine adjustment device to be adjusted for letting the movable rod of said adjustment device be moved vertically to the desired position and then fixed in the adjusted position by fastening tight said fine adjustment device again.