DEVICE FOR EXPANDING HOLLOW BODIES

Title:

DEVICE FOR EXPANDING HOLLOW BODIES

Document Type and Number:

WIPO Patent Application WO/2011/035840

Kind Code:

A3

Abstract:

The invention relates to a device for expanding hollow bodies, in particular pipe ends, comprising several radially movable, sector-shaped expandable jaws (1), which are arranged in a retainer so as to be distributed about an axis "A-A" and have cut-outs from cylindrical surfaces (6), the radii of which correspond to the radii of the expanded hollow body (10), wherein projections (8) and recesses (7) are arranged in alternation in the joints between the expandable jaws (1), and wherein the outer surfaces of the projections (8) extend radially inward relative to the cylindrical surfaces (6) at least at the ends thereof. In order to achieve the aim of producing sufficient expansions for the connection of plastic pipes by means of a single-stage radial stroke and nevertheless suppressing sharp-edged impressions in the expanded pipe end, a) the cylindrical surfaces (6) have a rounded transition into the outer surfaces of the projections (8), b) the expandable jaws (1) are tapered radially inward in the area of the free ends thereof, and c) the recesses (7) and the projections (8) are continued in the area (11) tapered radially inward. The invention further relates to a use of the device to expand hollow bodies (10) made of plastic pipes having shape memory.

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Inventors:

LINDNER KNUT (DE)
KRAUSE THORALF (DE)
GREDING ARND (DE)

Application Number:

PCT/EP2010/005299

Publication Date:

May 19, 2011

Filing Date:

August 28, 2010

Export Citation:

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Assignee:

ROTHENBERGER AG (DE)
LINDNER KNUT (DE)
KRAUSE THORALF (DE)
GREDING ARND (DE)

International Classes:

B21D39/20; B21D41/02; B29C57/04; F16L13/14

Foreign References:

DE4339993C1	1995-01-05
DD221936A1	1985-05-08
EP0725908B1	1998-11-18
EP2090384A2	2009-08-19

Attorney, Agent or Firm:

ZAPFE, Hans (Heusenstamm, DE)

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