Mandrel for bending
US7219527B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 16, 2004 |
| Grant date | May 22, 2007 |
| Priority date | — |
| Expiry date | Jun 2, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D9/03
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A mandrel for bending which inhibits generation of irregularities on the inside of the bend is provided. The mandrel comprises a plurality of plugs in the form of discs and a through-hole is created substantially in the center of each plug. A flexible member is inserted through the through-holes of the respective plugs. One end of the flexible member is fixed to a shank so that the plugs are connected to the shank in series. Each plug is provided with a flat slant surface that descends from about the center of the plug toward the outer periphery of the plug. A lock hole is formed in parallel to the through hole in each plug and a flexible lock member, one end of which is fixed to the shank, is passed through the lock holes of the respective plugs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.