Planar blank and a coil spring manufactured therefrom
US4760849A · kind A · utility
221Cited by
7References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1986 |
| Grant date | Aug 2, 1988 |
| Priority date | — |
| Expiry date | Mar 31, 2006 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2230/0091
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A planar blank is provided which permits the manufacture of a coil spring suitable for implantation. The blank has an elongated, essentially straight mid section which at its ends passes over into sections that are bent in the plane of the blank in opposite directions to form a blank having Z-shape. A coil spring made from the blank (in which the spring material as seen in cross section has radially flattened shape) at its ends has a lower pitch than the mid section or no pitch at all.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.