Motorized lifter

Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum

Reexamination Certificate

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Details

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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