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
Patent
1993-03-08
1994-10-04
Brown, David
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
49360, B66B 1300, E05F 1100
Patent
active
H00013625
ABSTRACT:
An elevator car has a drive mechanism mounted in a compact housing on the upper surface of the car. The drive mechanism includes a rotatable drive shaft, around which is mounted a linear actuator block having a plurality of ball bearings, obliquely arranged relative to the shaft, and firmly touching the shaft. Rotation of the shaft by a motor makes the block move linearly along the shaft. A bracket attached to the block carries an elevator door. Rotation of the shaft therefore opens and closes the door. The direction of movement of the block, and hence the door, depends on the direction of rotation of the shaft. The drive mechanism is compact and simple, and can be applied to new elevators or can be used to retrofit existing elevator cars.
REFERENCES:
patent: 3431678 (1969-03-01), Stuart, Jr. et al.
patent: 3670455 (1972-06-01), Slaybaugh
patent: 4043430 (1977-08-01), Kraft et al.
patent: 4149615 (1979-04-01), Kappenhagen
patent: 4317382 (1982-03-01), Riser
Brochure of Zero-Max, entitled "Roh'lix Linear Actuators" (Aug. 1983).
Herrmann C. Paul
Herrmann Walter J.
Brown David
Eilberg William H.
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