Apparatus for hanging a board
US4113216A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1977 |
| Grant date | Sep 12, 1978 |
| Priority date | — |
| Expiry date | Jan 21, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F2007/186
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus for hanging a board, such as a road sign board or an advertising sign board, comprises a first cam sleeve which is provided rotatably surrounding the axis of a construction for hanging a board and a second cam sleeve which is provided not rotatably but slidably on the same axis of the first cam sleeve. A board is fixed on the first cam sleeve and the one edge face of the second sleeve is pressed against the edge face of the first cam sleeve by the spring arranged at the other side of the second cam sleeve. Each contacting cam faces of the first and second cam sleeves has two sections which are vertical and slanting to the axis of the cam sleeve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.