Linear door drive operator

Details Linear door drive operator Linear door drive operator

1996-07-19

1998-08-25

Valenza, Joseph E.

Elevator, industrial lift truck, or stationary lift for vehicle

With barrier for regulating access to load support

Includes motor or motor driven linkage for shifting barrier

187325, 187318, 187319, B66B 1306

Patent

active

057974713

ABSTRACT:
An elevator system has a car provided with a doorway and a door movable across the doorway. An improved mechanism to move the door selectively to open and closed positions includes a header mounted to the car above the door. The header supports a linear drive carrying the door. The drive includes a spool rotationally mounted to the header for driving a cable wound about the spool, the cable being operatively connected to a hanger carrying the door for moving the hanger linearly across the header responsive to rotational movement of the spool. The spool further includes a vertically extending axial opening. A door operator comprises a motor driving an output shaft. The door operator is secured to the header so that the output shaft is received in the spool axial opening, whereby operation of the motor causes rotation of the spool.

REFERENCES:
patent: 505270 (1893-09-01), Hicks et al.
patent: 1707648 (1929-04-01), Turner et al.
patent: 2121906 (1938-06-01), Dunn
patent: 2899021 (1959-08-01), O'Grady
patent: 2905463 (1959-09-01), Borden
patent: 4177881 (1979-12-01), Kappenhagen
patent: 4685537 (1987-08-01), Kappenhagen

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