| 摘要 |
A fall arrest device (100) for use on an elongate safety line or track (180) comprises: chassis means (102) having safety line retaining means (105) to retain an elongate safety line or track (180) whilst allowing movement of the device (100) therealong; locking cam means (132, 133, 134, 135) for locking the device (100) to said elongate safety line or track (180) in a fall arrest situation; biasing means (122, 124, 128) to urge said locking cam means (132, 133, 134, 135) into locking engagement with a safety line or track (180) accommodated in the safety line retaining means (105) in response to a sudden change in load experienced by the device (100), and means (112) for attaching personnel safety means (113, 115) to the device (100); characterised in that the locking cam means (132, 133, 134, 135) comprises first and second independent actuable cam elements (133, 135), said cam elements (133, 135) being actuated by common arrester means (128) in response to a sudden change in load experienced by the device (100) such that said first cam element (133) traps the elongate safety line or track (180) relative to said chassis means (102) when the elongate safety line or track (180) slopes in a first direction and such that said second cam element (135) traps the elongate safety line or track (180) relative to said chassis means (102) when the elongate safety line or track (180) slopes in a second direction.
|
