Punch unit
US5884546A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 21, 1997 |
| Grant date | Mar 23, 1999 |
| Priority date | — |
| Expiry date | Feb 21, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/9476
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A punch unit includes a punch driver having a punch connected to it. A guide bushing receives the punch for guiding its axial displacement. A compression spring urges the punch driver rearwardly, away from the guide bushing. An intermediate member located between the guide bushing and the compression spring includes a collar, a holding member positioned concentrically inside the collar and releasable retaining means. The collar is rotatable relative to the holding member such that rotation in a first direction moves the retaining means into a locked position in which the guide bushing is prevented from moving longitudinally out of said holding member and rotation of the collar in a second direction opposite to the first direction moves the retaining means into an unlocked position in which the guide bushing is removable from the holding member. An indexing pin, also located in the intermediate member, releasably engages selected detent seats in the guide bushing to establish the rotational position of the guide bushing and hence also the punch length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.