A fall shock absorber comprises a frame 5 formed by an elongated profile that has a U-shaped cross section. The frame comprises two parallel strips 11 which are attached to each other by a bridge 13. The strips accommodate tapered slots 15 through which a shaft 17 is projected. A bracket 19 to which a safety cable 21 is fixed is present on the shaft. The width of the slot at the wider end 15A is equal to the thickness of the shaft 17 and the width of the slot at the narrower end 15B is smaller than the thickness of the shaft. The material of the shaft 17 is softer than the material of the strips 11, so that when the shaft is displaced through the slots the shaft shows plastic deformation.
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