Plastic spring and method and apparatus for making the same
US8939438B2 · kind B2 · utility
11Cited by
16References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 8, 2010 |
| Grant date | Jan 27, 2015 |
| Priority date | — |
| Expiry date | Aug 31, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7742
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
This invention provides a helical spring formed of plastic material, comprising a pair of end coils situated at respective ends of said helical spring; at least one full pitch active coil between said pair of end coils; a pair of transition coils, each transition coil interconnecting an end of a respective end coil to an end of a respective proximate full pitch active coil, and having a varying pitch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.