| 摘要 |
A push-type and a pull-type door-latch opener capable of use with a plunger-type fusible pin operated fire-safety lock mechanism including a mounting plate, a horizontal pivoting rod attached to the plate, a vertical pivoting rod attached to the plate at a right angle to and adjacent the horizontal pivoting rod, a horizontal bell crank pivoted about the vertical rod and having a first arm projecting into the plane of the door for operating the door-latch and a second arm engaged by a portion of a door handle pivoted on the horizontal rod, and a torsion spring coaxial with the horizontal rod for biasing the door handle into a preselected position.
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