Patent ID: 8702132
Filing Date: 2014-04-22
Classification: E05B,E05C,Y10T

Abstract:
1. A latch assembly for a door lock comprising, in combination: a base including first and second sidewalls and a main section extending between the first and second sidewalls, with each of the first and second sidewalls of the base including a first sliding slot, a first guiding slot, and a second guiding slot, with the first guiding slot of each of the first and second sidewalls of the base including a vertical section and an inclined section, with the main section adapted to be mounted to a door; wherein with the latch in the unlatching position and with the linking rod moving along the first axis towards the latch through a travel slightly smaller than the length of each of the slots of the follower plate, the first ends of the two sidewalls of the safety plate press against the positioning pin to move the positioning pin along the second guiding slots of the base, disengaging the positioning pin from the engaging notches of the follower plate and releasing the follower plate, and the latch moves from the unlatching position to the latching position, with an engagement hole formed in each of the first and second sidewalls of the follower plate and located between the first and second ends of the first and second sidewalls of the follower plate, with the engagement holes of the follower plate aligned with the positioning holes of the base when the latch is in the latching position, with the engagement holes of the follower plate not aligned with the positioning holes of the base when the latch is in the unlatching position, with each of the two sidewalls of the safety plate further including a second hole between the second end and the engaging notch of the safety plate, with the latch assembly further comprising: wherein with the latch in the latching position and with the first and second stops melted by heat, the safety spring moves the first distal end of the first safety pin into the positioning hole of the first sidewall of the base and moves the second distal end of the second safety pin into the positioning hole of the second sidewall of the base, preventing the follower plate from moving relative to the base along the first axis, retaining the latch in the latching position.