Motorized lifter

Details Motorized lifter Motorized lifter

2003-09-22

2008-09-16

Marcelo, Emmanuel M (Department: 3654)

Implements or apparatus for applying pushing or pulling force

Apparatus for hauling or hoisting load, including driven...

Device includes rotatably driven, cable contacting drum

C254S329000, C294S110100, C294S118000, C414S618000, C414S626000

Reexamination Certificate

active

07424998

ABSTRACT:
A lifter including tongs; an electric motor having a stator, a rotor, and one or more windings and a shaft operatively coupled with the first tongs for actuating the first tongs to an open position for receiving a load and actuating the first tongs to a closed position for engaging the load; and a vector drive controller electrically coupled to the electric motor for controlling the operation of the electric motor. A method of handling a load with a motorized lifter including at least one set of tongs and an electric motor coupled to the tongs, the method including moving the tongs of the motorized lifter to a home position by operation of the electric motor, wherein the electric motor is controlled by a vector drive controller; moving the tongs out of the home position; placing the tongs over the load; and positioning the tongs against the load by operation of the vector drive controlled electric motor so as to frictionally engage the load with the tongs.

REFERENCES:
patent: 4496063 (1985-01-01), Ishii et al.
patent: 4743056 (1988-05-01), Oliason
patent: 5477121 (1995-12-01), Sirjola
patent: 5769250 (1998-06-01), Jussila et al.
patent: 5841256 (1998-11-01), Oja et al.
patent: 6014007 (2000-01-01), Seibel et al.
patent: 6293747 (2001-09-01), Thomas
patent: 6331025 (2001-12-01), Douglas

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