Solid vs. Tubular Handles for Permanent Lifting Magnets
Posted on April 15, 2016
Each permanent lifting magnet
has a handle
which is used for turning on and off the magnetic power by rotating it. The handle is
extruded from the main body of the lifting magnets and consequently easy to be subjected to
On the market for permanent lifting magnets, there are two types of the handles. One is
tubular handle which is comprised of outer tube and a sliding bar inside. Another is solid handle
which is simply a thick iron rod. Here are the photos for your reference.
About 10 years ago Armstrong Magnetics manufactured and supplied the NL series permanent
lifting magnets which were equipped with tubular handles. They were our 1st generation of
permanent lifting magnet device. Unfortunately, our customers
claimed that there were problems with the tubular handle design.
When transporting lifting magnet with a heavy load attached, the handle
had great chances in colliding with other heavy obstacles and would
have resulted in deformation of its outer tube. Even with a
minimal degree of deformation,
the bar inside the outer tube would become sticky and therefore could not be rotated between OFF
and ON positions. This was inconvenient for our customer and led to
production downtime, eventhough we had always immediately provided
them with new handles as replacements.
Armstrong lifting magnets, 1st Generation with a Tubular Handle -
Now we are no longer making and supplying those tubular-handle lifting magnets .
NL-B series, the 3rd generation of Armstrong lifting magnets, are
built with solid handles which are strong and tough enough to
withstand violent collisions without deformation.
Since we introduced our 3rd generation, NL-B lifting magnet
equipment, 5 years ago, we have NEVER received any claims for
damages of the solid handles. This design improvement has
been hassel-free, cost effective, and time efficient for our
customers. No more request for replacement! No
more arranging for return shipping! No more down-time for your
production! No more fixes by millwrights!
Armstrong lifting magnets, 3rd Generation with a Solid Handle - Not