Telescoping controlled force spring
US11009304B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 13, 2017 |
| Grant date | May 18, 2021 |
| Priority date | — |
| Expiry date | Oct 13, 2037 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF41A9/70
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A spring comprises a continuous wire member formed into a plurality of coils along a central axis. Each of the plurality of coils comprises a plurality of straight portions extending between bend portions each extending from one of the straight portions. The plurality of coils form a first spring body and a second spring body, each spring body comprising at least three coils and having a first end and a second end with the first end of the second spring body connected to the second end of the first spring body. In an unloaded state the first spring body has a first unique pitch distance between bend portions of each pair of adjacent coils and the first unique pitch distance decreases from the first end of the first spring body to the second end of the first spring body, and the second spring body has a second unique pitch distance between bend portions of each pair of adjacent coils and the second unique pitch distance increases from the first end of the second spring body to the second end of the second spring body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.