EP 0195408 A3 19870429 - IMPROVED FLEXIBLE MANDREL FOR BENDING HOLLOW ARTICLES
Title (en)
IMPROVED FLEXIBLE MANDREL FOR BENDING HOLLOW ARTICLES
Publication
Application
Priority
US 71436385 A 19850321
Abstract (en)
[origin: EP0195408A2] The invention comprises a flexible mandrel for insertion into and removal from a hollow member, said mandrel being adapted to provide support for the walls of the hollow member in the process of bending the member, the mandrel comprising a plurality of elongated individual hoses disposed together in a side-by-side manner to form a unitary, elongated mandrel structure, said hoses being capable of expanding in cross section when a fluid is directed to them under pressure at a predetermined pressure value and contracting in cross section when the pressure value is lowered to or below a predetermined value, the cross-sectional expansion and contraction of the hoses being effective to expand and contract the cross-sectional area of the mandrel structure.
IPC 1-7
IPC 8 full level
B21D 9/01 (2006.01)
CPC (source: EP)
B21D 9/01 (2013.01)
Citation (search report)
- [AD] US 3922134 A 19751125 - KUPFRIAN WILBUR J
- [AD] US 1555895 A 19251006 - JOHN WEBER
- [X] US 3851519 A 19741203 - CALVIN E, et al
- [A] DE 1552862 A1 19690911 - BANNING AG MASCHINENFABRIK J
- [A] DE 2449221 A1 19750424 - PNEUMATIQUES CAOUTCHOUC MFG
Designated contracting state (EPC)
DE FR GB IT NL SE
DOCDB simple family (publication)
EP 0195408 A2 19860924; EP 0195408 A3 19870429; JP S61253126 A 19861111
DOCDB simple family (application)
EP 86103646 A 19860318; JP 6100386 A 19860320