Closure fasteners – Bolts – Sliding
Patent
1997-03-07
2000-03-28
Boucher, Darnell
Closure fasteners
Bolts
Sliding
292DIG36, 292DIG65, 160201, 49322, 16DIG20, E05C 112
Patent
active
060421584
ABSTRACT:
A drop-catch mechanism for a vertically movable door is provided for preventing the free-fall of the door in doorway guides when a counterbalancing mechanism for the door malfunctions and a tensioning member for the counterbalancing mechanism becomes slack or loses tension. The drop-catch mechanism includes a plunger element, disposed within the door adjacent one of the lateral edges thereof. The plunger element is movable between a retracted position and an extended position where the outboard end extends from within the door and engages a guide. The drop-catch mechanism also includes an actuator crank having a portion rotatably mounted within the door, and operably coupled through a camming element to the plunger element, and having a portion extending through an aperture in the door face with a rotatable external leg coupled to the tensioning member for maintaining the plunger element in the retracted position. When the tensioning member is taut, it biases the plunger element to the retracted position. When the tensioning member is slack, however, the actuator moves the plunger element towards the extended position where it engages an engagement member arranged within the guide to arrest downward movement.
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Boucher Darnell
Rite-Hite Holding Corporation
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