Dual-spring plunger for a plunger matrix mattress
US9119478B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 2013 |
| Grant date | Sep 1, 2015 |
| Priority date | — |
| Expiry date | Jan 5, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F3/00
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A dual-spring plunger for a plunger matrix mattress assembly includes an outer tension spring with an upper end fixed to an outer spring mount of a plunger guide body and a lower end located below the guide body positioned to receive a bottom end of a pin of the plunger. An inner tension spring nested within the outer tension spring has an upper end fixed to the inner spring mount of the guide body and a lower end having a spur slidably captured within a slot through a fin of the shaft of the pin. The outer spring is tensioned while the inner spring is not tensioned during a first portion of downward movement of the pin relative to the pin guide, whereas both the outer and the inner spring are tensioned during a second portion of downward movement of the pin relative to the pin guide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.