Expansion device for hollow bodies
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United States of America Patent
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N/A
Issued Date -
Sep 14, 2006
app pub date -
Feb 15, 2006
filing date -
Mar 8, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An expansion device for hollow bodies, such as pipe ends having a base body (1) in which a bore (11) for the axial guidance of a displaceable, a tapering spreading member (10) is disposed, and having an expansion head (13) which contains a thimble ring (14), and sector-shaped spreader jaws (15) and is releasably joined to the base body (1). The spreader jaws (15) are guided for radial displacement in the thimble ring (14) by the axial movement of the spreading member, and friction surfaces are provided with a coating of a hard material to reduce attrition. In one embodiment at least the portion of the spreading member (10) that acts upon the spreader jaws (15) is provided with a coating (18) made of the hard material, e.g., titanium nitride (TiN).
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