Conveyors: power-driven – Conveyor or accessory therefor specialized to convey people – With means to control the operation of the section
Reexamination Certificate
2011-04-26
2011-04-26
Hess, Douglas A (Department: 3651)
Conveyors: power-driven
Conveyor or accessory therefor specialized to convey people
With means to control the operation of the section
C198S322000
Reexamination Certificate
active
07931136
ABSTRACT:
A shopping cart conveyor system is designed to shut the system down in the event that a shopping cart becomes jammed. The system includes a track operable to guide a shopping cart between a first location and a second location, and a drive assembly for moving a shopping cart along the track. The drive assembly includes engagement members movable relative to the track and operable to engage and move a shopping cart from the first location to the second location, and a drive motor (e.g., an electric motor) operable to provide movement to the engagement members. A force sensor detects a parameter (e.g., motor current) of the drive assembly corresponding with a force required to move the engagement members. A controller receives information regarding a frequency of change in the parameter and compares that information to a known value (e.g., a frequency of the engagement members). Preferably, the controller is programmed to stop the drive motor when the frequency of change of the parameter falls within a certain range of the parameter (e.g., frequency of the engagement members).
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Hess Douglas A
Michael & Best & Friedrich LLP
Pflow Industries Inc.
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