| 摘要 |
A descender system includes an elongated strap of sufficient length to lower a person from a danger area to a safe area. The descender system includes a harness adapted to support a person connected to a compact descender mechanism having a channel through which the strap passes. First, second and third parallel cylindrical pins supported in side-by-side alignment in the channel, the strap passing through a first end of the passage around portions of the first, second, and third pins and through a second end of the passage. The first pin is held stationary, allowing movement of the second and third pins toward the first pin. A camming surface adjustment moves a camming surface in sliding, leveraged engagement with the third pin to force it toward the second pin, incrementing frictional drag of the first, second, and third pins on the strap.
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