Bending device
US6820450B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 2002 |
| Grant date | Nov 23, 2004 |
| Priority date | — |
| Expiry date | Nov 3, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D7/025
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The bending device comprises a hydraulic motor for moving a feeding table, and a hydraulic circuit including first and second switching valves which can be selectively switched between a speed control channel for supplying operating oil from a discharge-rate variable hydraulic pump to the hydraulic motor by way of a servo valve and a pressure control channel for supplying high pressure operating oil from the hydraulic pump to the hydraulic motor. When the feeding table provided with a chuck mechanism gripping a longitudinal material is moved to a bending mechanism to bend the material, control of the speed and application of axial compressive force can be conducted by switching of the first and second switching valves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.