Lift, Transport and Reinstall Stuck Manhole Covers with Ease
Jun 08, 2016
It takes a lot of muscle power to lift manhole cover out of their frames manually using a hook. Manhole covers may weigh up to 70 kilograms (154 lbs.). Ergonomic considerations make lifting heavy manhole covers a rather risky undertaking. Even if two persons lift the heavy covers, injuries may occur.
The long cover lifting bar with handle clearly facilitates the use and maneuvering. To lift the cover out of its frame the operator inserts two 'keys' into the two opening in the manhole cover. These keys are then hitched to the lifter hook. The lifter hooks can move continuously in horizontal direction. This allows the step-less adjustment of the connection between manhole cover holes and hooks.
The mechanically operated manhole cover lifter SDH-M-10 is suitable for manhole covers with diameters up to 900 mm (35.4''). Operators may adjust the distance between the hooks continuously between 100 mm and no more than 590 mm (3.9 – 23.2''). Tilting the SDH-M-10 using the lifting bar with handle will lift up the manhole cover.
Alternatively, loosely seated cast steel or gray cast iron covers may be lifted using a magnet. This eliminates the need to adjust the hook distances. For this procedure, the Probst Company offers a shortened hook, which links up to the optional permanent lifting magnet PML-400. The magnet may be turned on or off with a single easy hand movement.
The SDH-LIGHT lifter is the low-cost 'little brother' in the family of Probst manhole cover lifters. This lifter is particularly light and handy. It weighs only 18 kg (39.7 lbs.). Upon request, we retrofit this manhole cover lifter with a permanent lifting magnet. The SDH-LIGHT lifter is suitable for manhole covers with diameters up to 800 mm (31.5''). Lowering the handles tilts the SDH-LIGHT and the manhole cover is lifted up. As described for the SDH-M-10, special traverses may also be mounted on the SDH-LIGHT for the lifting of split manhole covers.
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Karoline von Bredow
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