Variable speed electric hoist

Details Variable speed electric hoist Variable speed electric hoist

1991-04-18

1992-08-18

Sotelo, Jesus D.

Traversing hoists

With haul-in line

254362, 318261, B66C 1318

Patent

active

051391562

ABSTRACT:
A variable speed electric hoist includes an invertor unit for frequency-controlling the speed of rotation of a lifting motor, a brake on/off section for turning off a brake according to a command produced from the invertor unit while the invertor unit is supplying a three-phase AC current to the lifting motor. The electric hoist also includes an emergency brake turn-on section for detecting a condition that a command produced from the invertor unit is not stopped after a lifting/lowering command is stopped to thereby turn on the brake upon detection of the condition.

REFERENCES:
patent: 4175727 (1977-11-01), Clarke
patent: 4359208 (1982-11-01), Kelm et al.
patent: 4437133 (1984-03-01), Rueckert
patent: 4519479 (1985-05-01), Tanahashi
patent: 4548299 (1985-10-01), Nomura
patent: 4636962 (1987-01-01), Broyden et al.
patent: 4789135 (1988-12-01), Watanabe

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