SCREW EXTRACTOR FOR THE RELEASE OF BLOCKED AND OXIDIZED MANHOLES
Safety aid that avoids dangerous hammering to unlock lids or manhole covers blocked by inactivity, rust, scale or deformation.
Hammering is an operation that can be dangerous for possible splinters projection, for causing sparks potentially very dangerous when lifting covers of gas and petrochemical fluids, and also for the risk of breakage of the cover (cast iron is fragile), this accessory must be used in conjunction with an appropriate ITALIFTERS clamp that will be inserted into the catch latch and locked on the adjustable drag of the extractor, then the clock wise rotation of the screw exerts a great upstream force that will easily breaks the incrustations and allow the initial opening of the first millimeters of the lid which can then be lifted with the normal systems, the lifting screw is rotated by inserting into the upper ring a screwdriver or a lever, the fulcrum that will be placed immediately on the outside of the frame and above the small metal plate that will offer a solid foundation to prevents possible sunken on asphalt of the screw foot.
Phase 1. Insertion of the mechanical hook into the appropriate slot.
Phase 2. Rotating the mechanical hook and looking it.
Phase 3 The clockwise rotation of the screw allows the initial release and unblocking of the lid.
Use with ITALIFTERS mechanical hooks.