Patent · US Active

Device for expanding hollow bodies

US8801424B2 · kind B2 · utility

3Cited by

3References

8Claims

0Family size

Assignee

ROTHENBERGER AG · DE

Inventors

Knut Lindner · Kelkheim, DE
Thoralf Krause · Leipzig, DE
Arnd Greding · Hofheim, DE

Key dates

Filing date	Aug 28, 2010
Grant date	Aug 12, 2014
Priority date	—
Expiry date	May 24, 2031

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29C57/04
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A device for expanding a hollow body includes a plurality of sector-shaped expandable jaws disposed in a holder and distributed about a central axis. The expandable jaws extend along the axis to a free end and are radially movable with respect to the axis. Each of the expandable jaws includes: a cylindrical surface having a radius corresponding to a radius of the expanded hollow body and an inward radial taper at an area of the free end; and a plurality of projections and recesses disposed in a joint region and arranged in an alternating manner with each other along the axis and at least partially extending into the area of the free end. The cylindrical surfaces are rounded off to transition to respective outer surfaces of the projections. The outer surfaces of the projections extend, at least at ends of the projections, radially inward with respect the cylindrical surfaces.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.