Elevator – industrial lift truck – or stationary lift for vehicle – Having specific load support drive-means or its control – Includes control for power source of drive-means
Patent
1997-03-26
1999-05-04
Nappi, Robert E.
Elevator, industrial lift truck, or stationary lift for vehicle
Having specific load support drive-means or its control
Includes control for power source of drive-means
187286, 187285, B66B 132
Patent
active
059005963
ABSTRACT:
This invention includes a brake system for a hydraulic ram or another cylinder, that can be employed as an emergency brake for a lifting elevator. When actuated, the brake arms contact the ram circumferentially to slow and stop the falling ram. The brake arms are preferably lined with an able material that frictionally engages the ram to stop the downward motion of the ram. The brake system may be actuated by loss of hydraulic pressure, by an electronic signal from a hydraulic pressure detector, by down overspeed sensor or by an uncontrolled down motion detector. According to another aspect of the present invention, a controller, which is preferably a programmed control system, compares the actual motion of the elevator as sensed by a detector to a desired motion. Under certain conditions, if the actual motion differs from the desired motion, the controller actuates the brake.
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Article, "Innovation", Elevator World, pp. 50-52, Feb. 96.
Baldwin Paul L.
Huen Tony S.
Koshak John W.
Murphy James L.
Inventio AG
Nappi Robert E.
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