Electricity: motive power systems – Limitation of motor load – current – torque or force
Reexamination Certificate
2002-04-11
2004-05-25
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Limitation of motor load, current, torque or force
C318S280000, C318S282000, C318S286000, C318S266000, C318S590000, C318S591000, C049S026000, C049S028000
Reexamination Certificate
active
06741052
ABSTRACT:
TECHNICAL FIELD
This invention relates generally to control systems and more particularly to movable barrier control systems.
BACKGROUND
Many control systems are known in the art, including control systems for use with movable barriers such as, for example, garage doors. Many such control systems must be calibrated to a given installed setting in order to better accommodate physical influences that can vary from installation to installation. Some control systems provide a human interface to allow an operator to make the appropriate calibration settings. Other systems utilize sensors and/or processing capability to automatically sense the relevant physical influences and then use such information to automatically calibrate the control system to the particular setting.
Automatic calibration can greatly facilitate ease of installation and operation, contributing to cost effective efficiency, efficacy, and safety. Unfortunately, at least for some applications (such as, for example, moveable barrier operators), automatic calibration often does not provide the calibration most suited to a particular setting. Furthermore, even if properly calibrated in the first instance, the appropriate calibration settings may change over time as the physical conditions change (due to, for example, friction and wear, age, temperature, maintenance, temporary (or permanent) physical impingements, and so forth).
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Fitch Even Tabin & Flannery
Leykin Rita
The Chamberlain Group, Inc.
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