A - Human Necessities – 62 – B
Patent
A - Human Necessities
62
B
227/5
A62B 35/00 (2006.01) A62B 1/12 (2006.01) A62B 35/04 (2006.01) E06C 7/18 (2006.01)
Patent
CA 1139722
26 SAFETY DESCENT DEVICE ABSTRACT OF THE DISCLOSURE A fall prevention safety device for attachment to a harness worn by a workman for providing a safely controlled descension rate from an elevated structure includes a cable having one end connected to the harness and strung around a double pulley system having an upper pulley mounted to the elevated structure and a lower pulley mounted to the upper end of a vertically reciprocal plunger which falls substantially unimpeded into a hydraulic cylinder. The cylinder substantially resists upward withdrawal of the plunger. The other cable end is connected to the upper pulley yoke such that during ascent of the workman up the structure, the lower pulley and plunger move downwardly and take up cable slack. If the workman slips and falls at any point during ascent, the cable immediately and automatically provides descension at a controlled rate determined by the resisted withdrawal rate of the plunger as the cable now pulls the lower pulley upward. The hydraulic cylinder includes a bypass line with ports communicating with the hydraulic cylinder at upper and lower compartments above and below the inner plunger end having a seal therearound defining the two compartments. The inner plunger end also carries a one-way valve which is in an open condition during downward plunger movement and is closed by fluid pressure upon initiation of workman descent.
356412
Kirby Eades Gale Baker
Miller James W.
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