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US 8,177,035 B2Granted
Elevator system which controls a value of overspeed
AssigneeMitsubishi Electric Corporation
InventorsTakaharu Ueda, Eiji Ando
Life of this patent
Estimating the term…
Abstract
An elevator system in which a controller monitors whether or not a speed of an ascending/descending body reaches a preset overspeed. At a time of maintenance work, a stopper is interposed between a buffer and the ascending/descending body to limit a lowered position of the ascending/descending body. A stopper detector detects installation of the stopper onto at least one of the buffer and the ascending/descending body. When the stopper is detected by the stopper detector, the controller lowers a set value of the overspeed.
Claims10
An elevator system comprising:
- a car to be raised and lowered in a hoistway;
- a controller for monitoring whether or not a speed of the car reaches a preset overspeed, the overspeed being a criterion for judgment of an abnormal car speed and having a value based on a pattern according to a running direction and an absolute position of the car;
- and
- means for people detection on top of the car for detecting whether or not a person is present on top of the car,
- wherein the controller lowers a set value of the overspeed when the means for people detection on top of the car detects that the person is present on top of the car.
2 more elements
An elevator system comprising:
- a car to be raised and lowered in a hoistway;
- a controller for monitoring whether or not a speed of the car reaches a preset overspeed, the overspeed being a criterion for judgment of an abnormal car speed and having a value based on a pattern according to a running direction and an absolute position of the car;
- and
- a detector to detect whether a person is present on top of the car,
- wherein the controller lowers a set value of the overspeed when the detector car detects that the person is present on top of the car.
2 more elements
Dependencies are inferred from the claim text.