A thick-walled housing has a longitudinal hole with an end orifice that runs in the axial direction of the housing. A spring-loaded clamping unit is axially displaceable in the hole. An oblique hole in the housing obliquely opens into the longitudinal hole. The clamping unit clamps a rope fed through the end orifice of the longitudinal hole and emerging through the oblique hole. The clamping unit has an axial projection on each side. The housing has guide slots located opposite one another that guide the axial projections. The ends of the axial projections form handles that pass through and extend beyond the housing. The clamping unit consists of a front and rear roller and a bearing part connecting the rollers one behind the other. The diameter of the front roller is smaller and depends on its forward displacement. The axial projections are provided on the larger rear roller.
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