Knockout extracting tool
US4167056A · kind A · utility
16Cited by
6References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 27, 1978 |
| Grant date | Sep 11, 1979 |
| Priority date | — |
| Expiry date | Apr 27, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T225/371
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A hand tool for quickly, easily, and cleanly removing concentric knockout rings from electrical sheet metal enclosures. The tool is an elongated member fabricated of flat metal stock. Notches in opposite edges at one end of the tool are adapted to engage opposite inner edges of a knockout ring having a central opening. The tool is rocked back and forth pivoting the two halves of the knockout ring about the tabs retaining it in the sheet metal of the enclosure until the tabs fracture completely severing the knockout ring from the enclosure and providing an opening in the enclosure wall for accommodating cable or conduit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.