Magnetic pay telephone cash box proximity switch
US5978458A · kind A · utility
2Cited by
5References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1997 |
| Grant date | Nov 2, 1999 |
| Priority date | — |
| Expiry date | Aug 1, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M17/026
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A cash box proximity switch arrangement is provided for public telephones and is mounted in an upper portion of a lower housing of the telephone above the vault area. The switch is contained in a sealed housing which prevents contamination from dirt, moisture and the like. A magnet can be arranged so as to provide a bi-stable magnetic circuit between the floor of the lower phone housing and a cash box lid attached to a cash box which has been installed in the vault area of the telephone housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.