Shock isolation for selective call receivers
US5307508A · kind A · utility
19Cited by
6References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 13, 1991 |
| Grant date | Apr 26, 1994 |
| Priority date | — |
| Expiry date | May 13, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2001/3894
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A shock isolator (30) is provided within the housing (38) of a selective call receiver to substantially increase the natural frequency of vibration of the housing (38) and the printed circuit boards (54, 56) within the housing. The shock isolator (30) is a body of elastomeric material, preferably butyl rubber, which has component receiving apertures (32) molded therein for receiving the components (46, 48, 50) on the printed circuit board while at the same time contacting the printed circuit board. The butyl rubber has a damping of at least 25% (preferably 50%) and a Durometer of between 50 and 70 type A (preferably 60).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.