Electricity: motive power systems – Motor-reversing – Periodic- or intermittent-reversing
Reexamination Certificate
2005-03-22
2005-03-22
Martin, David (Department: 2837)
Electricity: motive power systems
Motor-reversing
Periodic- or intermittent-reversing
C318S286000, C318S466000, C318S468000, C318S471000, C318S432000, C318S433000, C049S028000, C049S031000
Reexamination Certificate
active
06870334
ABSTRACT:
A movable barrier operator having a motor controller (10) and motor (11) that control selective movement of a movable barrier (12) also has an obstacle detector (14) that utilizes an automatically determined excess force threshold value to permit reliable detection of an obstacle under a wide variety of operational circumstances, including changing physical circumstances, aging components, temperature variations, and motor runtime. In a preferred embodiment, a characteristic force value for the system is frequently updated as a function of actual measured force requirements (and further compensated, pursuant to various embodiments, with respect to other conditions such as temperature and motor runtime). This characteristic force value is then utilized to determine the excess force threshold value.
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“Force Regulation.” 2 pp. Berner Torantriebe Oct. 17, 2002. <http://www.bernertorantriebe.de/HomeE/Warum_BernerE/KraftregulierungE /kraftregulierunge.html>.
British Search Report for British patent application GB0400158.2 dated Sep. 2, 2004.
Gregori Eric M.
Jurado Carlos
Stephan Matthew C.
Colon Santana Eduardo
Fitch Even Tabin & Flannery
Martin David
The Chamberlain Group, Inc.
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