Running gear, in particular for hoists and suspended loads, and

Details Running gear, in particular for hoists and suspended loads, and Running gear, in particular for hoists and suspended loads, and

1999-03-30

2000-11-28

Nappi, Robert E.

Electricity: motive power systems

Braking

H02K 1732

Patent

active

061539929

ABSTRACT:
A running gear for hoists and suspended loads has a running rail with two spaced-apart travel tracks that support axially spaced-apart running wheels. An electric motor is coupled to a self-locking worm gear for directly driving one of the running wheels. The running wheels are rotatably supported in a frame to which an assembly for hoisting suspended loads is secured. In order to prevent the running gear from rolling and pitching during braking, which can cause increased wear of the running gear and the running rail, a control unit is provided which is operatively connected to the electric motor and determines a start-up rate during the start-up phase of the motor from an average increase of the motor torque as a function of time, and decreases the motor torque as a function of time at a slower rate than the start-up rate for slowing down the running gear.

REFERENCES:
patent: 4342378 (1982-08-01), Hmelovsky
patent: 4378059 (1983-03-01), Hatakeyama et al.
patent: 5155305 (1992-10-01), Horbruegger et al.
patent: 5625175 (1997-04-01), Gutkenecht et al.

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