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US 12,741,848 B2Granted
Elongation based monitoring of tension members
AssigneeOtis Elevator Company
InventorsAlexander Serkh, Bardia Guilani
Life of this patent
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Abstract
A method and apparatus includes an indicator mark that is located on at least one tension member at a predetermined distance from a fixed point. A visual indication of tension member replacement is provided when the indicator mark approaches a specified distance from the fixed point after a tension member length adjustment.
Claims12
A method comprising:
- marking at least one tension member with an indicator mark at a predetermined distance from a fixed point;
- adjusting a length of the at least one tension member to accommodate for stretching;
- replacing the at least one tension member when the indicator mark approaches a specified distance from the fixed point;
- wherein the predetermined distance from the fixed point is determined based on a plurality of elevator characteristics;
- wherein an elevator car is coupled to a counterweight by the at least one tension member, the method further including:
- after installation, setting an initial buffer distance between a bottom of the counterweight and buffer mounted at a bottom of a hoistway;
- monitoring a reduction of buffer distance as a result of stretching;
- and
- during each adjustment, shortening the length of the at least one tension member until the bottom of the counterweight returns to the initial buffer distance.
6 more elements
An elevator system, comprising:
- an elevator car moveable within a hoistway;
- at least one tension member that supports the elevator car and facilitates movement of the elevator car in the hoistway;
- and
- an indicator mark located on the at least one tension member at a predetermined distance from a fixed point, and wherein a visual indication of tension member replacement is provided when the indicator mark approaches a specified distance from the fixed point after a tension member length adjustment;
- wherein the elevator car is coupled to a counterweight by the at least one tension member, and wherein:
- after installation, an initial buffer distance is set between a bottom of the counterweight and a buffer mounted at a bottom of the hoistway;
- a reduction of the initial buffer distance as a result of stretching is monitored to provide a current buffer distance;
- and
- after each adjustment, a length of the at least one tension member comprises a shortened length and the bottom of the counterweight is at the initial buffer distance.
6 more elements
Dependencies are inferred from the claim text.