Double linear motor and elevator doors using same

Details Double linear motor and elevator doors using same Double linear motor and elevator doors using same

1998-10-21

1999-09-07

Nappi, Robert 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

310 12, 310 13, 49118, B66B 1314, H02K 4100, E05C 706

Patent

active

059490365

ABSTRACT:
A single linear motor has two sets of active sides with windings, secondaries and backirons. The front of the motor drives one load and the rear of the motor selectively drives another load. The windings on the two sides may have their phases reversed so as to drive the load in opposite directions in response to the same three-phase, U, V, W drive signals; or, only one load need be drive at any one time. The loads may be double, center-opening or two-speed elevator doors.

REFERENCES:
patent: 5587566 (1996-12-01), Barten et al.
patent: 5736693 (1998-04-01), Piech et al.
patent: 5808246 (1998-09-01), Peruggi et al.

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