Rotating warning bell
US6374767B1 · kind B1 · utility
7Cited by
16References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2000 |
| Grant date | Apr 23, 2002 |
| Priority date | — |
| Expiry date | Feb 22, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60Q5/00
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A railroad car-warning bell is centrally mounted on the hub of a wheel. Three opposed cylinder housings each contain a reciprocating ball which hits an end hammer to sound the bell when the wheel turns slowly up to speeds of nominally 15 mph. At higher speeds the balls are held against the end hammers, thereby automatically shutting off the bell to prevent noise pollution. The preferred embodiment has a single cylinder mounted along a diameter of the ringing bell. Three steel balls oscillate back and forth hitting a hammer at each end of the cylinder. A dampener may be used to adjust the ring of the bell.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.