The manhole lifter is call Cap Balancer, made to use open the huge and large manhole in easier. the lifting force are reduce down in 10 times of weight and the spring lift is more than 60000 time for open/close.
: Manhole cover of reactor, Vessel
: Tank lid and tank filter
: Other heavy lid to be manually opened and closed.
The use of a torsion coil spring instead of a compression spring enables the device to be shorter and to have a space-saving design.
Safe and simple balance adjustment
Safe and continuius adjustment is possible within the specified torque range just by turning the spring adjustment screw. You can set and release the screw during installation and maintenance with case.
Reduce resistance when opening and closing a lid, even in the case of inclined installation.
The use of bearing that is effective for radial and thrust loads enables the cap balancer to open and close a lid using almost the same force as with horizontal installation, even when the lid is installed at an angle.