| 摘要 |
A power sheave comprising a first chain having a first end coupled to a brake mechanism, a second chain having a first end coupled to a railway car brake rigging, a wheel rotatably coupled to the railway car and operatively coupled to a second end of the first chain and a second end of the second chain, a sensor operatively coupled to the railway car proximate the wheel, and a spring mechanism operatively coupled to the wheel, the spring mechanism configured to bias the wheel in a first rotational direction. When the railway car brake mechanism is applied, the wheel rotates in a second rotational direction opposite the first rotational direction into a first position. When the railway car brake mechanism is released, the wheel rotates in the first rotational direction under the bias of the spring mechanism into a second position. The sensor is configured to detect when the wheel is in the second position.
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