Power-assisted cart retriever with attenuated power output

Details Power-assisted cart retriever with attenuated power output Power-assisted cart retriever with attenuated power output

2008-05-22

2009-02-24

Ellis, Christopher P (Department: 3618)

Motor vehicles

Power

Electric

C701S093000

Reexamination Certificate

active

07493979

ABSTRACT:
The present invention is a motorized shopping cart retriever that includes a controller that attenuates the power provided to the drive system of the retriever to prevent the retriever from being utilized to move an excessively heavy load of shopping carts. By preventing the retriever and carts from being subjected to overloaded conditions, the operational lives of the retriever and carts are maximized. The retriever is also provided with a burst mode that allows the power provided to the drive system to rapidly increase past the normal attenuated level for a brief period of time in order to reduce the time required to accelerate a retriever loaded with carts to a terminal velocity.

REFERENCES:
patent: 5573078 (1996-11-01), Stringer et al.
patent: 6070679 (2000-06-01), Berg et al.
patent: 6220379 (2001-04-01), Schugt et al.
patent: 6244366 (2001-06-01), Otterson et al.
patent: 7389836 (2008-06-01), Johnson et al.

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