Electrical box with coupling members
US4954667A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 1989 |
| Grant date | Sep 4, 1990 |
| Priority date | — |
| Expiry date | Feb 15, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02G3/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrical wall or ceiling box adapted to rapidly and securely couple an electrical wiring device thereto. The electrical box includes a pair of wedge-shaped inserts positioned within a pair of openings in the end walls of the electrical box. The inserts have a threaded, curved face portion for gripping a mounting screw and an oppositely facing sloping face portion for interacting with the sloping wall portions of the openings in the electrical box. The inserts also have a shoulder extending outwardly on three sides for engaging a three-sided ledge within the openings for retaining the inserts therein. This structure results in a significantly higher retention force than in prior devices, tending to resist disengagement of the inserts with the box upon insertion of a mounting screw therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.