DIVE PREVENTION DEVICE OF OVERHEAD DOOR

• Main Authors: HIRAI HIDEMASA, FUNAYAMA MASANORI, UBE YOSUKE
• Format: Patent
• Language: English
• Published: 09.02.2012
• Subjects: DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; FIXED CONSTRUCTIONS; FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES,FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS,BLINDS, GATES; LADDERS

PROBLEM TO BE SOLVED: To prevent a locking member of a dive prevention device from being locked to a horizontal guide rail part even when an overhead door is in a fully opened state.SOLUTION: The dive prevention device 6 includes: a fixing member 6A, a first turning body 6B turnable around a first shaft 61; and a second turning body 6C turnable around a second shaft 62. The first turning body 6B includes: a locking member 6D locked to a guide rail; and a torsion spring (energizing member) 6E for energizing the turning of the first turning body 6B in a direction of locking the locking member 6D. When a door panel is positioned at the vertical part of the guide rail, the first turning body 6B is prevented from being turned in the direction of locking the locking member 6D to the guide rail. When the door panel is moved from the vertical part of the guide rail to a horizontal part, the second turning body 6C is turned and abutted to the first turning body 6B. The first turning body 6B is prevented from being turned in an energized direction.