Patent ID: 8544897
Filing Date: 2013-10-01
Classification: E05B,Y10T

Abstract:
1. A door lock comprising: a bracket adapted to be fixed to a side of a door; a latch mounted to the bracket and pivotable about a first axis between an extended, latching position and a retracted, unlatching position; a follower including a first end pivotably connected to the latch, a second end spaced from the first end of the follower along a second axis perpendicular to the first axis, and an extension located intermediate the first and second ends of the follower and extending along a third axis perpendicular to the first and second axes; a linking rod including first and second ends spaced along the second axis, with the first end of the linking rod pivotably connected to the second end of the follower, with the second end of the linking rod movable in an unlatching direction for moving the latch from the extended, latching position to the retracted, unlatching position and movable in a latching direction opposite to the unlatching direction for moving the latch from the retracted, unlatching position to the extended, latching position, with an operative member adapted to be operatively connected to the linking rod and operable to move the linking rod in the unlatching direction and the latching direction; a connecting seat fixed to the bracket and including a mounting plate, with the mounting plate including first and second surfaces spaced along the third axis, with a first slot extending from the first surface through the second surface, with a groove extending from the first surface through the second surface and intersecting the first slot, with a positioning groove formed in the first surface of the connecting seat, with the extension extending into and movable along the first slot; an anchor pivotably mounted to the connecting seat, with the anchor including a pivotal section and an anchoring section spaced from the pivotal section along the second axis, with the anchor further including first and second sides spaced along the third axis, with the anchoring section including a stop portion extending from the second side of the anchor along the third axis, with the stop portion further including inner and outer peripheral faces spaced along the second axis, with a first notch extending from the inner peripheral face through the outer peripheral face, with a through-hole extending from the first side through the second side of the anchor, with the pivotal section of the anchor pivotably mounted to the connecting seat, with the stop portion received in the groove of the connecting seat, with the anchor pivotable in the groove about the third axis between an alignment position and an anchoring position, with the through-hole of the anchor aligned with the positioning groove of the connecting seat and with the first notch of the anchor aligned with the first slot of the connecting seat when the anchor is in the alignment position, with the through-hole of the anchor misaligned from the positioning groove of the connecting seat, the first notch of the anchor misaligned from the first slot of the connecting seat, and the stop portion of the anchor received in and blocking the first slot when the anchor is in the anchoring position; and a positioning member fixed in the through-hole of the anchor, with a portion of the positioning member received in the positioning groove to retain the anchor in the alignment position, wherein when the positioning member melts due to heat of a fire, the anchor pivots about the third axis from the alignment position to the anchoring position under action of gravity, preventing movement of the follower and preventing the latch from moving from the extended, latching position to the retracted, unlatching position.