Elevator system

Details Elevator system Elevator system

1975-06-25

1977-08-16

Schaffer, Robert K.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 128

Patent

active

040420680

ABSTRACT:
A traction elevator system in which the floor leveling device is active when the elevator door is open, and it is maintained active while the door is closing. The brake is partially released and the drive motor is activated when the elevator car receives a signal to start, and full release of the brake is initiated before the door, when closing, reaches the closed position, preparatory to a run. The leveling device, partial brake release and armature current buildup in the drive motor cooperate to provide a motor torque which exactly balances the unbalanced load, to hold the elevator car at floor level as the brake is fully released. When the door reaches the closed position, the car may be smoothly started without delay or "bump", as the brake is fully released and the unbalanced load is already compensated for.

REFERENCES:
patent: 1944471 (1934-01-01), Seeger
patent: 3207265 (1965-09-01), Lund et al.
patent: 3486101 (1969-12-01), Rufli
patent: 3507360 (1970-04-01), Ostrander et al.
patent: 3614996 (1971-10-01), Saito et al.
patent: 3902572 (1975-09-01), Ostrander

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