Hoist for shaft frames of rainwater drains, used in street gutters

摘要

The hoist (10) is operated by a hydraulic motor and has an annular base frame (12) which runs on wheels (14) and is hydraulically adjustable in height in relation to the wheels. The hoist has suspended pull rods (22,24,26,28) which are hydraulically movable upwards. A chisel arrangement (40) is fixed to the pull rods so that the chisels are adjustable laterally outwards by the hydraulic arrangement, sliding under the bottom edge of a shaft frame. An extra frame (54) of a rectangular U-shape is placed from underneath, on the base frame and can be rapidly detachably fixed to it. The interior of the additional frame is larger than the outer structure clearance of the shaft frame.