| 摘要 |
A descender (10) comprising a base (11) having a connection means (26), a pivotal member (12) pivotally mounted on the base (11) about a pivot axis (1), the pivotal member (12) defining first and second spaced projections (14, 15) for engaging a rope (5), the base (11) defining a stop means (18) and a lever (23) pivotable between first and second end positions, the lever (23) and the pivotal member (12) defining complementary cam surfaces (22) to regulate the distance between the stop means (18) and the second projection (15), a resistance force applied to the rope (5) being at a minimum when the second projection (15) is moved away from the stop means (18) and the lever (23) is located in a mid-position, and is at a maximum when the lever (23) moves towards either end position wherein the rope (5) is pressed between the second projection (15) and a braking surface (24).
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