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US 4,538,436 AGranted
Pipe bending machine with bending mandrel
OwnerRigobert Schwarzeinventor
Life of this patent
Estimating the term…
Abstract
A pipe bending machine has a travelling carriage, a bending template, a bending mandrel arranged in a pipe to be bent near the bending template and having a mandrel rod, a cylinder-piston unit for withdrawing the mandrel, and a measuring device associated with the mandrel rod and arranged to actuate in the event of overloading of the mandrel rod a switch element so as to stop or eliminate the overloading of the mandrel or the mandrel rod.
Claims19
A pipe bending machine, comprising a travelling carriage provided with first clamping means;
- a bending template provided with second clamping means;
- a bending mandrel arranged in a pipe to be bent adjacent to said bending template, and having a mandrel rod having a rear end;
- means connected with said rear end of said mandrel rod for withdrawing said mandrel from said pipe;
- measuring means connected with said rear end of said mandrel rod for determining both the axial and rotary or torsion loading of said mandrel rod;
- and a switch element arranged to be actuated by said measuring means in the event that either the axial or torsion loading exceeds a predetermined value to at least stop either axial or torsional overloading of said mandrel for via said switch means.
2 more elements
Dependencies are inferred from the claim text.