Movable barrier operator multi-technique excess force...

Details Movable barrier operator multi-technique excess force... Movable barrier operator multi-technique excess force...

E - Fixed Constructions

01

F

E01F 13/00 (2006.01) E05F 15/00 (2006.01) E06B 9/68 (2006.01) H02H 7/085 (2006.01)

Patent

CA 2468630

A movable barrier operator can use (11) a first technique to prevent an excess application of force during controlled movement of a movable barrier (43) and at least a second technique (12) to similarly prevent an excess application of force during such movement. Both techniques can then be utilized to determine (13) when an application of excess force may nevertheless occur and not be reasonably avoided. In one embodiment, two techniques (21 and 22) can be used to detect force as applied during movement of the movable barrier and such information can be used to determine (23) whether applied force is being reliably indicated. In another embodiment, travel limit information (51), travel information (52) and travel history information (53) are utilized to assess whether normal operation of the movable barrier operator should be over-ridden (54) due to a possibly expression of undue force.

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