Magnetic load lifting device

Details Magnetic load lifting device Magnetic load lifting device

1996-09-05

1998-09-29

Kramer, Dean

Handling: hand and hoist-line implements

Magnet

335291, 361144, B66C 104

Patent

active

058137122

ABSTRACT:
A magnetic lifting device having a load lifting magnet with at least one magnetic coil arranged in a housing. A driven synchronous alternator is arranged in a housing for generating a voltage supplied to the magnetic coil. A supply line leading from the alternator to the magnetic coil supplies direct current to the magnetic coil. An electrical switching circuit with a control line arranged within the alternator housing connects to a control switch outside the alternator housing through a further control line outside the alternator housing. The control switch actuates a first rectifier connected to the alternator for powering the coil of the magnet. It also deactivates the magnet by powering a second rectifier of a reverse polarity to release the magnet load. The control switch also includes an overload signal and alarm, and a ready light when the magnet is ready to be powered.

REFERENCES:
patent: 3196320 (1965-07-01), Manting
patent: 4323329 (1982-04-01), Chlad
patent: 4600964 (1986-07-01), Ela et al.
patent: 4647268 (1987-03-01), Scholl
patent: 5325260 (1994-06-01), Repetto
"Lasthebemagnete im Stahlhandel (I)" by K. Freitag, dhf May 1986, pp. 42-45.
"Lasthebemagneteimim Stahlhandel (II)" by K. Freitag, dhf Jun. 1986, pp. 27-34.
"Ohne Netz" Demag Fordertechnik, Industrie-Anzeiger 1978/81, pp. 17 to 20.
"Magnete" Industrie-Anzeiger 93-Nr. 13 of Feb. 12, 1971 (p. 253).
Mechanical Handling, Jan. 1966 (p. 14).

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