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US 4,313,330 AGranted
Pipe bending apparatus
OwnerJames D. Cummingsinventor
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OwnerJames D. Cummingsinventor
Estimating the term…
A pipe bending apparatus for bending thin wall pipe used in oil and gas pipelines. The apparatus includes a housing section with an upper bending die connected to its frame. Mounted within the housing section are a pair of flexible external bending shoe assemblies for clamping around the external surface of that section of pipe to be bent. The apparatus further includes a flexible mandrel aligned between the external bending shoe assemblies and adapted for being inserted into the pipe and expanded during bending operations. A positioning assembly is also connected between the mandrel and the housing section for accurately positioning the mandrel in the pipe and moving the pipe with respect to the apparatus while insuring that the bend is properly aligned. The mandrel further includes a series of slidably mounted shoe assemblies which move in a toggle-like manner to engage the inner surface of the pipe.
In an apparatus for bending pipe of the type having a housing section and an upper bending die connected to the housing section, the combination comprising:
An improved mandrel for engaging the inside surface of a pipe, the mandrel of the type having a frame section, a power supply unit attached thereto and an elongated, flexible bar coupled to the power unit adapted for longitudinal movement with said pipe, wherein the improvement comprises:
In an improved mandrel for engaging the internal surface of a pipe, the mandrel of the type having a frame section, a power supply unit attached thereto and an elongated, flexible bar coupled to the power unit and adapted for longitudinal movement within said pipe, wherein the improvement comprising, in combination:
Dependencies are inferred from the claim text.