Telephone relay cover
US5187738A · kind A · utility
3Cited by
1References
9Claims
0Family size
Inventor
Key dates
| Filing date | Sep 5, 1991 |
| Grant date | Feb 16, 1993 |
| Priority date | — |
| Expiry date | Sep 5, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M17/026
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A cover for a coin return relay assembly used in coin-operated telephones is formed of a tough, puncture-resistent material formed into a generally U-shaped barrier. The barrier is mounted on the relay such that it overlies the relay armature and coin return chute, preventing the insertion of probe-like instruments through the telephone box to contact such elements. The side walls of the cover are offset from the planes of the adjacent telephone housing walls, while the cover is mounted to the relay in a non-rigid manner to limit the ability of penetration therethrough.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.