Retainer railway car truck bolster spring
US4333403A · kind A · utility
47Cited by
11References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1979 |
| Grant date | Jun 8, 1982 |
| Priority date | — |
| Expiry date | Apr 9, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F3/04
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
One or more of the springs supporting the bolster of a railway car truck is a two stage spring group comprising an outer coil and an inner coil disposed within and coaxial with the outer spring. A retainer is provided to hold the inner spring in relation to the outer spring. The retainer has helically arranged lugs or a flange in engagement with the outer coil at the lower end, and the retainer also includes a support surface for supporting the lower end of the inner coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.