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US 5,637,842 AGranted
Elevator safety device
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMasashi Yonemoto, Hiroyasu Itoh
Life of this patent
Estimating the term…
Abstract
An elevator safety device in which a counterweight cam is attached to the counterweight and top terminal landing final limit switches are disposed below the bottom terminal landing of the hoistway so that it is operated by the counterweight cam. The top terminal landing final limit switches only need to be provided in accordance with the counterweight buffer stroke, regardless of to what extent the car has been flung upward, with the result that fewer final limit switches are required.
Claims6
An elevator safety device comprising:
- a car contactor attached to a car;
- a plurality of bottom terminal landing final limit switches which are arranged along the hoisting direction below a bottom terminal landing of a hoistway and actuated to generate bottom position signals upon engagement with said car contactor;
- a counterweight contactor attached to a counterweight;
- a plurality of top terminal landing final limit switches which are arranged in the hoisting direction below the bottom landing terminal of the hoistway and actuated to generate top position signals upon engagement with said counterweight contactor;
- and
- means for generating an emergency stop command, said means being responsive to the top and bottom position signals.
3 more elements
An elevator safety device comprising:
- a car contactor attached to a car;
- a plurality of bottom terminal landing final limit switches which are arranged in the hoisting direction below a bottom terminal landing of a hoistway and actuated to generate bottom position signals upon engagement with said car contactor;
- a counterweight contactor attached to a counterweight;
- a top terminal landing car side final limit switch which is disposed above a top terminal landing of the hoistway and actuated to generate a first top position signal upon engagement with said car contactor;
- a top terminal landing counterweight side final limit switch which is disposed below the bottom terminal landing of the hoistway and actuated to generate a second top position signal upon engagement with said counterweight contactor;
- and
- means for generating an emergency stop command responsive to the bottom position signals and the first and second top position signals.
4 more elements
Dependencies are inferred from the claim text.