Patent ID: 6125907
Filing Date: 2000-10-03
Classification: E05F,E05Y,E06B

Abstract:
A closure apparatus for a structure, comprising:a closure member extendable to close an opening of the structure and retractable to open the opening of the structure;a fixed member adapted to be fixed to the structure;a driving device including a motor connected to the closure member to extend and retract the closure member, one of the driving device and the motor being a displaceable member rotatably connected to the fixed member;a forward load detecting spring disposed between the displaceable member and the fixed member to resist a forward rotational displacement of the displaceable member;a backward load detecting spring disposed between the displaceable member and the fixed member to resist a backward rotational displacement of the displaceable member; andat least one sensor detecting a forward displacement and a backward displacement of the displaceable member.