Elevator having second driving device

Details Elevator having second driving device Elevator having second driving device

2008-07-29

2008-07-29

Cuomo, Peter M. (Department: 3654)

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support drive-means or its control

Includes threaded rider mating with support screw in...

C187S267000, C074S089260, C074S089290, C074S089230

Reexamination Certificate

active

11494008

ABSTRACT:
An elevator includes an elevator car guided to move up and down relative to a supporting member, a screw shaft having an upper end attached to the supporting member, a driving nut rotatably supported in a coupling device and threaded with the screw shaft, one driving device coupled to rotate the screw shaft and to move the driving nut up and down along the screw shaft, and a coupling device rotatably attached onto the driving nut and coupled to the elevator car. Another spare driving device may further be coupled to drive the screw shaft for moving the elevator car to a lower level or a safe location when the driving device either fails or is damaged.

REFERENCES:
patent: 3381541 (1968-05-01), Thireau et al.
patent: 3815710 (1974-06-01), Shrum
patent: 3881575 (1975-05-01), Manaugh
patent: 4635491 (1987-01-01), Yamano et al.
patent: 4742891 (1988-05-01), Kunii et al.
patent: 4747320 (1988-05-01), Nilsson
patent: 5339704 (1994-08-01), Lindberg

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